Add OpenSAML 5 Support

Issue gh-11658

config/src/main/java/org/springframework/security/config/annotation/web/configurers/saml2/Saml2LoginConfigurer.java

@@ -22,6 +22,7 @@ import java.util.List;
 import java.util.Map;
 
 import jakarta.servlet.http.HttpServletRequest;
+import org.opensaml.core.Version;
 
 import org.springframework.beans.factory.NoSuchBeanDefinitionException;
 import org.springframework.context.ApplicationContext;
@@ -35,15 +36,19 @@ import org.springframework.security.config.annotation.web.configurers.CsrfConfig
 import org.springframework.security.core.Authentication;
 import org.springframework.security.saml2.provider.service.authentication.AbstractSaml2AuthenticationRequest;
 import org.springframework.security.saml2.provider.service.authentication.OpenSaml4AuthenticationProvider;
+import org.springframework.security.saml2.provider.service.authentication.OpenSaml5AuthenticationProvider;
 import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistration;
 import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistrationRepository;
 import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistrations;
 import org.springframework.security.saml2.provider.service.web.HttpSessionSaml2AuthenticationRequestRepository;
 import org.springframework.security.saml2.provider.service.web.OpenSaml4AuthenticationTokenConverter;
+import org.springframework.security.saml2.provider.service.web.OpenSaml5AuthenticationTokenConverter;
+import org.springframework.security.saml2.provider.service.web.OpenSamlAuthenticationTokenConverter;
 import org.springframework.security.saml2.provider.service.web.Saml2AuthenticationRequestRepository;
 import org.springframework.security.saml2.provider.service.web.Saml2AuthenticationTokenConverter;
 import org.springframework.security.saml2.provider.service.web.Saml2WebSsoAuthenticationRequestFilter;
 import org.springframework.security.saml2.provider.service.web.authentication.OpenSaml4AuthenticationRequestResolver;
+import org.springframework.security.saml2.provider.service.web.authentication.OpenSaml5AuthenticationRequestResolver;
 import org.springframework.security.saml2.provider.service.web.authentication.Saml2AuthenticationRequestResolver;
 import org.springframework.security.saml2.provider.service.web.authentication.Saml2WebSsoAuthenticationFilter;
 import org.springframework.security.web.AuthenticationEntryPoint;
@@ -115,6 +120,8 @@ import org.springframework.util.StringUtils;
 public final class Saml2LoginConfigurer<B extends HttpSecurityBuilder<B>>
 		extends AbstractAuthenticationFilterConfigurer<B, Saml2LoginConfigurer<B>, Saml2WebSsoAuthenticationFilter> {
 
+	private static final boolean USE_OPENSAML_5 = Version.getVersion().startsWith("5");
+
 	private String loginPage;
 
 	private String authenticationRequestUri = "/saml2/authenticate";
@@ -366,10 +373,18 @@ public final class Saml2LoginConfigurer<B extends HttpSecurityBuilder<B>>
 		if (bean != null) {
 			return bean;
 		}
-		OpenSaml4AuthenticationRequestResolver openSaml4AuthenticationRequestResolver = new OpenSaml4AuthenticationRequestResolver(
+		if (USE_OPENSAML_5) {
-				relyingPartyRegistrationRepository(http));
+			OpenSaml5AuthenticationRequestResolver openSamlAuthenticationRequestResolver = new OpenSaml5AuthenticationRequestResolver(
-		openSaml4AuthenticationRequestResolver.setRequestMatcher(this.authenticationRequestMatcher);
+					relyingPartyRegistrationRepository(http));
-		return openSaml4AuthenticationRequestResolver;
+			openSamlAuthenticationRequestResolver.setRequestMatcher(this.authenticationRequestMatcher);
+			return openSamlAuthenticationRequestResolver;
+		}
+		else {
+			OpenSaml4AuthenticationRequestResolver openSamlAuthenticationRequestResolver = new OpenSaml4AuthenticationRequestResolver(
+					relyingPartyRegistrationRepository(http));
+			openSamlAuthenticationRequestResolver.setRequestMatcher(this.authenticationRequestMatcher);
+			return openSamlAuthenticationRequestResolver;
+		}
 	}
 
 	private AuthenticationConverter getAuthenticationConverter(B http) {
@@ -379,22 +394,45 @@ public final class Saml2LoginConfigurer<B extends HttpSecurityBuilder<B>>
 		AuthenticationConverter authenticationConverterBean = getBeanOrNull(http,
 				Saml2AuthenticationTokenConverter.class);
 		if (authenticationConverterBean == null) {
-			authenticationConverterBean = getBeanOrNull(http, OpenSaml4AuthenticationTokenConverter.class);
+			authenticationConverterBean = getBeanOrNull(http, OpenSamlAuthenticationTokenConverter.class);
 		}
-		if (authenticationConverterBean == null) {
+		if (authenticationConverterBean != null) {
-			OpenSaml4AuthenticationTokenConverter converter = new OpenSaml4AuthenticationTokenConverter(
+			return authenticationConverterBean;
+		}
+		if (USE_OPENSAML_5) {
+			authenticationConverterBean = getBeanOrNull(http, OpenSaml5AuthenticationTokenConverter.class);
+			if (authenticationConverterBean != null) {
+				return authenticationConverterBean;
+			}
+			OpenSaml5AuthenticationTokenConverter converter = new OpenSaml5AuthenticationTokenConverter(
 					this.relyingPartyRegistrationRepository);
 			converter.setAuthenticationRequestRepository(getAuthenticationRequestRepository(http));
 			converter.setRequestMatcher(this.loginProcessingUrl);
 			return converter;
 		}
-		return authenticationConverterBean;
+		authenticationConverterBean = getBeanOrNull(http, OpenSaml4AuthenticationTokenConverter.class);
+		if (authenticationConverterBean != null) {
+			return authenticationConverterBean;
+		}
+		OpenSaml4AuthenticationTokenConverter converter = new OpenSaml4AuthenticationTokenConverter(
+				this.relyingPartyRegistrationRepository);
+		converter.setAuthenticationRequestRepository(getAuthenticationRequestRepository(http));
+		converter.setRequestMatcher(this.loginProcessingUrl);
+		return converter;
 	}
 
 	private void registerDefaultAuthenticationProvider(B http) {
-		OpenSaml4AuthenticationProvider provider = getBeanOrNull(http, OpenSaml4AuthenticationProvider.class);
+		if (USE_OPENSAML_5) {
-		if (provider == null) {
+			OpenSaml5AuthenticationProvider provider = getBeanOrNull(http, OpenSaml5AuthenticationProvider.class);
-			http.authenticationProvider(postProcess(new OpenSaml4AuthenticationProvider()));
+			if (provider == null) {
+				http.authenticationProvider(postProcess(new OpenSaml5AuthenticationProvider()));
+			}
+		}
+		else {
+			OpenSaml4AuthenticationProvider provider = getBeanOrNull(http, OpenSaml4AuthenticationProvider.class);
+			if (provider == null) {
+				http.authenticationProvider(postProcess(new OpenSaml4AuthenticationProvider()));
+			}
 		}
 	}
 

config/src/main/java/org/springframework/security/config/annotation/web/configurers/saml2/Saml2LogoutConfigurer.java

@@ -20,6 +20,7 @@ import java.util.ArrayList;
 import java.util.List;
 
 import jakarta.servlet.http.HttpServletRequest;
+import org.opensaml.core.Version;
 
 import org.springframework.context.ApplicationContext;
 import org.springframework.security.authentication.AuthenticationManager;
@@ -33,17 +34,23 @@ import org.springframework.security.core.context.SecurityContextHolderStrategy;
 import org.springframework.security.saml2.provider.service.authentication.Saml2AuthenticatedPrincipal;
 import org.springframework.security.saml2.provider.service.authentication.logout.OpenSaml4LogoutRequestValidator;
 import org.springframework.security.saml2.provider.service.authentication.logout.OpenSaml4LogoutResponseValidator;
+import org.springframework.security.saml2.provider.service.authentication.logout.OpenSaml5LogoutRequestValidator;
+import org.springframework.security.saml2.provider.service.authentication.logout.OpenSaml5LogoutResponseValidator;
 import org.springframework.security.saml2.provider.service.authentication.logout.Saml2LogoutRequestValidator;
 import org.springframework.security.saml2.provider.service.authentication.logout.Saml2LogoutResponseValidator;
 import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistration;
 import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistrationRepository;
 import org.springframework.security.saml2.provider.service.web.authentication.logout.HttpSessionLogoutRequestRepository;
 import org.springframework.security.saml2.provider.service.web.authentication.logout.OpenSaml4LogoutRequestResolver;
-import org.springframework.security.saml2.provider.service.web.authentication.logout.OpenSaml4LogoutResponseResolver;
 import org.springframework.security.saml2.provider.service.web.authentication.logout.OpenSaml4LogoutRequestValidatorParametersResolver;
+import org.springframework.security.saml2.provider.service.web.authentication.logout.OpenSaml4LogoutResponseResolver;
+import org.springframework.security.saml2.provider.service.web.authentication.logout.OpenSaml5LogoutRequestResolver;
+import org.springframework.security.saml2.provider.service.web.authentication.logout.OpenSaml5LogoutRequestValidatorParametersResolver;
+import org.springframework.security.saml2.provider.service.web.authentication.logout.OpenSaml5LogoutResponseResolver;
 import org.springframework.security.saml2.provider.service.web.authentication.logout.Saml2LogoutRequestFilter;
 import org.springframework.security.saml2.provider.service.web.authentication.logout.Saml2LogoutRequestRepository;
 import org.springframework.security.saml2.provider.service.web.authentication.logout.Saml2LogoutRequestResolver;
+import org.springframework.security.saml2.provider.service.web.authentication.logout.Saml2LogoutRequestValidatorParametersResolver;
 import org.springframework.security.saml2.provider.service.web.authentication.logout.Saml2LogoutResponseFilter;
 import org.springframework.security.saml2.provider.service.web.authentication.logout.Saml2LogoutResponseResolver;
 import org.springframework.security.saml2.provider.service.web.authentication.logout.Saml2RelyingPartyInitiatedLogoutSuccessHandler;
@@ -106,6 +113,8 @@ import org.springframework.security.web.util.matcher.RequestMatcher;
 public final class Saml2LogoutConfigurer<H extends HttpSecurityBuilder<H>>
 		extends AbstractHttpConfigurer<Saml2LogoutConfigurer<H>, H> {
 
+	private static final boolean USE_OPENSAML_5 = Version.getVersion().startsWith("5");
+
 	private ApplicationContext context;
 
 	private RelyingPartyRegistrationRepository relyingPartyRegistrationRepository;
@@ -250,16 +259,28 @@ public final class Saml2LogoutConfigurer<H extends HttpSecurityBuilder<H>>
 			RelyingPartyRegistrationRepository registrations) {
 		LogoutHandler[] logoutHandlers = this.logoutHandlers.toArray(new LogoutHandler[0]);
 		Saml2LogoutResponseResolver logoutResponseResolver = createSaml2LogoutResponseResolver(registrations);
-		RequestMatcher requestMatcher = createLogoutRequestMatcher();
+		Saml2LogoutRequestFilter filter = new Saml2LogoutRequestFilter(
-		OpenSaml4LogoutRequestValidatorParametersResolver parameters = new OpenSaml4LogoutRequestValidatorParametersResolver(
+				createSaml2LogoutResponseParametersResolver(registrations),
-				registrations);
-		parameters.setRequestMatcher(requestMatcher);
-		Saml2LogoutRequestFilter filter = new Saml2LogoutRequestFilter(parameters,
 				this.logoutRequestConfigurer.logoutRequestValidator(), logoutResponseResolver, logoutHandlers);
 		filter.setSecurityContextHolderStrategy(getSecurityContextHolderStrategy());
 		return postProcess(filter);
 	}
 
+	private Saml2LogoutRequestValidatorParametersResolver createSaml2LogoutResponseParametersResolver(
+			RelyingPartyRegistrationRepository registrations) {
+		RequestMatcher requestMatcher = createLogoutRequestMatcher();
+		if (USE_OPENSAML_5) {
+			OpenSaml5LogoutRequestValidatorParametersResolver parameters = new OpenSaml5LogoutRequestValidatorParametersResolver(
+					registrations);
+			parameters.setRequestMatcher(requestMatcher);
+			return parameters;
+		}
+		OpenSaml4LogoutRequestValidatorParametersResolver parameters = new OpenSaml4LogoutRequestValidatorParametersResolver(
+				registrations);
+		parameters.setRequestMatcher(requestMatcher);
+		return parameters;
+	}
+
 	private Saml2LogoutResponseFilter createLogoutResponseProcessingFilter(
 			RelyingPartyRegistrationRepository registrations) {
 		Saml2LogoutResponseFilter logoutResponseFilter = new Saml2LogoutResponseFilter(registrations,
@@ -397,16 +418,22 @@ public final class Saml2LogoutConfigurer<H extends HttpSecurityBuilder<H>>
 		}
 
 		private Saml2LogoutRequestValidator logoutRequestValidator() {
-			if (this.logoutRequestValidator == null) {
+			if (this.logoutRequestValidator != null) {
-				return new OpenSaml4LogoutRequestValidator();
+				return this.logoutRequestValidator;
 			}
-			return this.logoutRequestValidator;
+			if (USE_OPENSAML_5) {
+				return new OpenSaml5LogoutRequestValidator();
+			}
+			return new OpenSaml4LogoutRequestValidator();
 		}
 
 		private Saml2LogoutRequestResolver logoutRequestResolver(RelyingPartyRegistrationRepository registrations) {
 			if (this.logoutRequestResolver != null) {
 				return this.logoutRequestResolver;
 			}
+			if (USE_OPENSAML_5) {
+				return new OpenSaml5LogoutRequestResolver(registrations);
+			}
 			return new OpenSaml4LogoutRequestResolver(registrations);
 		}
 
@@ -473,17 +500,23 @@ public final class Saml2LogoutConfigurer<H extends HttpSecurityBuilder<H>>
 		}
 
 		private Saml2LogoutResponseValidator logoutResponseValidator() {
-			if (this.logoutResponseValidator == null) {
+			if (this.logoutResponseValidator != null) {
-				return new OpenSaml4LogoutResponseValidator();
+				return this.logoutResponseValidator;
 			}
-			return this.logoutResponseValidator;
+			if (USE_OPENSAML_5) {
+				return new OpenSaml5LogoutResponseValidator();
+			}
+			return new OpenSaml4LogoutResponseValidator();
 		}
 
 		private Saml2LogoutResponseResolver logoutResponseResolver(RelyingPartyRegistrationRepository registrations) {
-			if (this.logoutResponseResolver == null) {
+			if (this.logoutResponseResolver != null) {
-				return new OpenSaml4LogoutResponseResolver(registrations);
+				return this.logoutResponseResolver;
 			}
-			return this.logoutResponseResolver;
+			if (USE_OPENSAML_5) {
+				return new OpenSaml5LogoutResponseResolver(registrations);
+			}
+			return new OpenSaml4LogoutResponseResolver(registrations);
 		}
 
 	}

config/src/main/java/org/springframework/security/config/annotation/web/configurers/saml2/Saml2MetadataConfigurer.java

@@ -18,11 +18,14 @@ package org.springframework.security.config.annotation.web.configurers.saml2;
 
 import java.util.function.Function;
 
+import org.opensaml.core.Version;
+
 import org.springframework.context.ApplicationContext;
 import org.springframework.security.config.annotation.web.HttpSecurityBuilder;
 import org.springframework.security.config.annotation.web.builders.HttpSecurity;
 import org.springframework.security.config.annotation.web.configurers.AbstractHttpConfigurer;
 import org.springframework.security.saml2.provider.service.metadata.OpenSaml4MetadataResolver;
+import org.springframework.security.saml2.provider.service.metadata.OpenSaml5MetadataResolver;
 import org.springframework.security.saml2.provider.service.metadata.Saml2MetadataResponseResolver;
 import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistration;
 import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistrationRepository;
@@ -73,6 +76,8 @@ import org.springframework.util.Assert;
 public class Saml2MetadataConfigurer<H extends HttpSecurityBuilder<H>>
 		extends AbstractHttpConfigurer<Saml2LogoutConfigurer<H>, H> {
 
+	private static final boolean USE_OPENSAML_5 = Version.getVersion().startsWith("5");
+
 	private final ApplicationContext context;
 
 	private Function<RelyingPartyRegistrationRepository, Saml2MetadataResponseResolver> metadataResponseResolver;
@@ -103,6 +108,12 @@ public class Saml2MetadataConfigurer<H extends HttpSecurityBuilder<H>>
 	public Saml2MetadataConfigurer<H> metadataUrl(String metadataUrl) {
 		Assert.hasText(metadataUrl, "metadataUrl cannot be empty");
 		this.metadataResponseResolver = (registrations) -> {
+			if (USE_OPENSAML_5) {
+				RequestMatcherMetadataResponseResolver metadata = new RequestMatcherMetadataResponseResolver(
+						registrations, new OpenSaml5MetadataResolver());
+				metadata.setRequestMatcher(new AntPathRequestMatcher(metadataUrl));
+				return metadata;
+			}
 			RequestMatcherMetadataResponseResolver metadata = new RequestMatcherMetadataResponseResolver(registrations,
 					new OpenSaml4MetadataResolver());
 			metadata.setRequestMatcher(new AntPathRequestMatcher(metadataUrl));
@@ -143,6 +154,9 @@ public class Saml2MetadataConfigurer<H extends HttpSecurityBuilder<H>>
 			return metadataResponseResolver;
 		}
 		RelyingPartyRegistrationRepository registrations = getRelyingPartyRegistrationRepository(http);
+		if (USE_OPENSAML_5) {
+			return new RequestMatcherMetadataResponseResolver(registrations, new OpenSaml5MetadataResolver());
+		}
 		return new RequestMatcherMetadataResponseResolver(registrations, new OpenSaml4MetadataResolver());
 	}
 

config/src/main/java/org/springframework/security/config/http/Saml2LoginBeanDefinitionParserUtils.java

@@ -16,6 +16,7 @@
 
 package org.springframework.security.config.http;
 
+import org.opensaml.core.Version;
 import org.w3c.dom.Element;
 
 import org.springframework.beans.BeanMetadataElement;
@@ -23,10 +24,14 @@ import org.springframework.beans.factory.config.BeanDefinition;
 import org.springframework.beans.factory.config.RuntimeBeanReference;
 import org.springframework.beans.factory.support.AbstractBeanDefinition;
 import org.springframework.beans.factory.support.BeanDefinitionBuilder;
+import org.springframework.security.saml2.provider.service.authentication.OpenSaml4AuthenticationProvider;
+import org.springframework.security.saml2.provider.service.authentication.OpenSaml5AuthenticationProvider;
 import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistrationRepository;
 import org.springframework.security.saml2.provider.service.web.DefaultRelyingPartyRegistrationResolver;
 import org.springframework.security.saml2.provider.service.web.HttpSessionSaml2AuthenticationRequestRepository;
 import org.springframework.security.saml2.provider.service.web.Saml2AuthenticationTokenConverter;
+import org.springframework.security.saml2.provider.service.web.authentication.OpenSaml4AuthenticationRequestResolver;
+import org.springframework.security.saml2.provider.service.web.authentication.OpenSaml5AuthenticationRequestResolver;
 import org.springframework.util.StringUtils;
 
 /**
@@ -35,6 +40,8 @@ import org.springframework.util.StringUtils;
  */
 final class Saml2LoginBeanDefinitionParserUtils {
 
+	private static final boolean USE_OPENSAML_5 = Version.getVersion().startsWith("5");
+
 	private static final String ATT_RELYING_PARTY_REGISTRATION_REPOSITORY_REF = "relying-party-registration-repository-ref";
 
 	private static final String ATT_AUTHENTICATION_REQUEST_REPOSITORY_REF = "authentication-request-repository-ref";
@@ -78,16 +85,21 @@ final class Saml2LoginBeanDefinitionParserUtils {
 			.rootBeanDefinition(DefaultRelyingPartyRegistrationResolver.class)
 			.addConstructorArgValue(relyingPartyRegistrationRepository)
 			.getBeanDefinition();
-		return BeanDefinitionBuilder.rootBeanDefinition(
+		if (USE_OPENSAML_5) {
-				"org.springframework.security.saml2.provider.service.web.authentication.OpenSaml4AuthenticationRequestResolver")
+			return BeanDefinitionBuilder.rootBeanDefinition(OpenSaml5AuthenticationRequestResolver.class)
+				.addConstructorArgValue(defaultRelyingPartyRegistrationResolver)
+				.getBeanDefinition();
+		}
+		return BeanDefinitionBuilder.rootBeanDefinition(OpenSaml4AuthenticationRequestResolver.class)
 			.addConstructorArgValue(defaultRelyingPartyRegistrationResolver)
 			.getBeanDefinition();
 	}
 
 	static BeanDefinition createAuthenticationProvider() {
-		return BeanDefinitionBuilder.rootBeanDefinition(
+		if (USE_OPENSAML_5) {
-				"org.springframework.security.saml2.provider.service.authentication.OpenSaml4AuthenticationProvider")
+			return BeanDefinitionBuilder.rootBeanDefinition(OpenSaml5AuthenticationProvider.class).getBeanDefinition();
-			.getBeanDefinition();
+		}
+		return BeanDefinitionBuilder.rootBeanDefinition(OpenSaml4AuthenticationProvider.class).getBeanDefinition();
 	}
 
 	static BeanMetadataElement getAuthenticationConverter(Element element) {

config/src/main/java/org/springframework/security/config/http/Saml2LogoutBeanDefinitionParserUtils.java

@@ -16,15 +16,22 @@
 
 package org.springframework.security.config.http;
 
+import org.opensaml.core.Version;
 import org.w3c.dom.Element;
 
 import org.springframework.beans.BeanMetadataElement;
 import org.springframework.beans.factory.config.RuntimeBeanReference;
 import org.springframework.beans.factory.support.BeanDefinitionBuilder;
-import org.springframework.security.saml2.provider.service.authentication.logout.OpenSamlLogoutRequestValidator;
+import org.springframework.security.saml2.provider.service.authentication.logout.OpenSaml4LogoutRequestValidator;
-import org.springframework.security.saml2.provider.service.authentication.logout.OpenSamlLogoutResponseValidator;
+import org.springframework.security.saml2.provider.service.authentication.logout.OpenSaml4LogoutResponseValidator;
+import org.springframework.security.saml2.provider.service.authentication.logout.OpenSaml5LogoutRequestValidator;
+import org.springframework.security.saml2.provider.service.authentication.logout.OpenSaml5LogoutResponseValidator;
 import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistrationRepository;
 import org.springframework.security.saml2.provider.service.web.authentication.logout.HttpSessionLogoutRequestRepository;
+import org.springframework.security.saml2.provider.service.web.authentication.logout.OpenSaml4LogoutRequestResolver;
+import org.springframework.security.saml2.provider.service.web.authentication.logout.OpenSaml4LogoutResponseResolver;
+import org.springframework.security.saml2.provider.service.web.authentication.logout.OpenSaml5LogoutRequestResolver;
+import org.springframework.security.saml2.provider.service.web.authentication.logout.OpenSaml5LogoutResponseResolver;
 import org.springframework.util.StringUtils;
 
 /**
@@ -33,6 +40,8 @@ import org.springframework.util.StringUtils;
  */
 final class Saml2LogoutBeanDefinitionParserUtils {
 
+	private static final boolean USE_OPENSAML_5 = Version.getVersion().startsWith("5");
+
 	private static final String ATT_RELYING_PARTY_REGISTRATION_REPOSITORY_REF = "relying-party-registration-repository-ref";
 
 	private static final String ATT_LOGOUT_REQUEST_VALIDATOR_REF = "logout-request-validator-ref";
@@ -62,8 +71,12 @@ final class Saml2LogoutBeanDefinitionParserUtils {
 		if (StringUtils.hasText(logoutResponseResolver)) {
 			return new RuntimeBeanReference(logoutResponseResolver);
 		}
-		return BeanDefinitionBuilder.rootBeanDefinition(
+		if (USE_OPENSAML_5) {
-				"org.springframework.security.saml2.provider.service.web.authentication.logout.OpenSaml4LogoutResponseResolver")
+			return BeanDefinitionBuilder.rootBeanDefinition(OpenSaml5LogoutResponseResolver.class)
+				.addConstructorArgValue(registrations)
+				.getBeanDefinition();
+		}
+		return BeanDefinitionBuilder.rootBeanDefinition(OpenSaml4LogoutResponseResolver.class)
 			.addConstructorArgValue(registrations)
 			.getBeanDefinition();
 	}
@@ -73,7 +86,10 @@ final class Saml2LogoutBeanDefinitionParserUtils {
 		if (StringUtils.hasText(logoutRequestValidator)) {
 			return new RuntimeBeanReference(logoutRequestValidator);
 		}
-		return BeanDefinitionBuilder.rootBeanDefinition(OpenSamlLogoutRequestValidator.class).getBeanDefinition();
+		if (USE_OPENSAML_5) {
+			return BeanDefinitionBuilder.rootBeanDefinition(OpenSaml5LogoutRequestValidator.class).getBeanDefinition();
+		}
+		return BeanDefinitionBuilder.rootBeanDefinition(OpenSaml4LogoutRequestValidator.class).getBeanDefinition();
 	}
 
 	static BeanMetadataElement getLogoutResponseValidator(Element element) {
@@ -81,7 +97,10 @@ final class Saml2LogoutBeanDefinitionParserUtils {
 		if (StringUtils.hasText(logoutResponseValidator)) {
 			return new RuntimeBeanReference(logoutResponseValidator);
 		}
-		return BeanDefinitionBuilder.rootBeanDefinition(OpenSamlLogoutResponseValidator.class).getBeanDefinition();
+		if (USE_OPENSAML_5) {
+			return BeanDefinitionBuilder.rootBeanDefinition(OpenSaml5LogoutResponseValidator.class).getBeanDefinition();
+		}
+		return BeanDefinitionBuilder.rootBeanDefinition(OpenSaml4LogoutResponseValidator.class).getBeanDefinition();
 	}
 
 	static BeanMetadataElement getLogoutRequestRepository(Element element) {
@@ -97,8 +116,12 @@ final class Saml2LogoutBeanDefinitionParserUtils {
 		if (StringUtils.hasText(logoutRequestResolver)) {
 			return new RuntimeBeanReference(logoutRequestResolver);
 		}
-		return BeanDefinitionBuilder.rootBeanDefinition(
+		if (USE_OPENSAML_5) {
-				"org.springframework.security.saml2.provider.service.web.authentication.logout.OpenSaml4LogoutRequestResolver")
+			return BeanDefinitionBuilder.rootBeanDefinition(OpenSaml5LogoutRequestResolver.class)
+				.addConstructorArgValue(registrations)
+				.getBeanDefinition();
+		}
+		return BeanDefinitionBuilder.rootBeanDefinition(OpenSaml4LogoutRequestResolver.class)
 			.addConstructorArgValue(registrations)
 			.getBeanDefinition();
 	}

gradle/libs.versions.toml

@@ -13,6 +13,7 @@ org-jetbrains-kotlin = "1.9.25"
 org-jetbrains-kotlinx = "1.8.1"
 org-mockito = "5.11.0"
 org-opensaml = "4.3.2"
+org-opensaml5 = "5.1.2"
 org-springframework = "6.2.0-M6"
 
 [libraries]
@@ -79,6 +80,10 @@ org-mockito-mockito-bom = { module = "org.mockito:mockito-bom", version.ref = "o
 org-opensaml-opensaml-core = { module = "org.opensaml:opensaml-core", version.ref = "org-opensaml" }
 org-opensaml-opensaml-saml-api = { module = "org.opensaml:opensaml-saml-api", version.ref = "org-opensaml" }
 org-opensaml-opensaml-saml-impl = { module = "org.opensaml:opensaml-saml-impl", version.ref = "org-opensaml" }
+org-opensaml-opensaml5-core-api = { module = "org.opensaml:opensaml-core-api", version.ref = "org-opensaml5" }
+org-opensaml-opensaml5-core-impl = { module = "org.opensaml:opensaml-core-impl", version.ref = "org-opensaml5" }
+org-opensaml-opensaml5-saml-api = { module = "org.opensaml:opensaml-saml-api", version.ref = "org-opensaml5" }
+org-opensaml-opensaml5-saml-impl = { module = "org.opensaml:opensaml-saml-impl", version.ref = "org-opensaml5" }
 org-python-jython = { module = "org.python:jython", version = "2.5.3" }
 org-seleniumhq-selenium-htmlunit-driver = "org.seleniumhq.selenium:htmlunit3-driver:4.20.0"
 org-seleniumhq-selenium-selenium-java = "org.seleniumhq.selenium:selenium-java:4.20.0"

saml2/saml2-service-provider/spring-security-saml2-service-provider.gradle

@@ -2,7 +2,9 @@ apply plugin: 'io.spring.convention.spring-module'
 
 configurations {
 	opensaml4Main { extendsFrom(optional, provided) }
+	opensaml5Main { extendsFrom(optional, provided) }
 	opensaml4Test { extendsFrom(opensaml4Main, tests) }
+	opensaml5Test { extendsFrom(opensaml5Main, tests) }
 }
 
 sourceSets {
@@ -12,12 +14,24 @@ sourceSets {
 			srcDir 'src/opensaml4Main/java'
 		}
 	}
+	opensaml5Main {
+		java {
+			compileClasspath += main.output + configurations.opensaml5Main
+			srcDir 'src/opensaml5Main/java'
+		}
+	}
 	opensaml4Test {
 		java {
 			compileClasspath += main.output + test.output + opensaml4Main.output + configurations.opensaml4Test
 			srcDir 'src/opensaml4Test/java'
 		}
 	}
+	opensaml5Test {
+		java {
+			compileClasspath += main.output + test.output + opensaml5Main.output + configurations.opensaml5Test
+			srcDir 'src/opensaml5Test/java'
+		}
+	}
 }
 
 sourceSets.configureEach { set ->
@@ -74,11 +88,20 @@ sourceSets.configureEach { set ->
 dependencies {
 	management platform(project(":spring-security-dependencies"))
 	api project(':spring-security-web')
-	api "org.opensaml:opensaml-core"
+	api 'org.opensaml:opensaml-core'
-	api ("org.opensaml:opensaml-saml-api")  {
+	api ('org.opensaml:opensaml-saml-api')  {
 		exclude group: 'commons-logging', module: 'commons-logging'
 	}
-	api ("org.opensaml:opensaml-saml-impl")  {
+	api ('org.opensaml:opensaml-saml-impl')  {
+		exclude group: 'commons-logging', module: 'commons-logging'
+	}
+
+	opensaml5MainImplementation libs.org.opensaml.opensaml5.core.api
+	opensaml5MainImplementation libs.org.opensaml.opensaml5.core.impl
+	opensaml5MainImplementation (libs.org.opensaml.opensaml5.saml.api)  {
+		exclude group: 'commons-logging', module: 'commons-logging'
+	}
+	opensaml5MainImplementation (libs.org.opensaml.opensaml5.saml.impl)  {
 		exclude group: 'commons-logging', module: 'commons-logging'
 	}
 
@@ -100,21 +123,24 @@ dependencies {
 jar {
 	duplicatesStrategy = DuplicatesStrategy.EXCLUDE
 	from sourceSets.opensaml4Main.output
+	from sourceSets.opensaml5Main.output
 }
 
 sourcesJar {
 	duplicatesStrategy = DuplicatesStrategy.EXCLUDE
 	from sourceSets.opensaml4Main.allJava
+	from sourceSets.opensaml5Main.allJava
 }
 
 testJar {
 	duplicatesStrategy = DuplicatesStrategy.EXCLUDE
 	from sourceSets.opensaml4Test.output
+	from sourceSets.opensaml5Test.output
 }
 
 javadoc {
-	classpath += sourceSets.opensaml4Main.runtimeClasspath
+	classpath += sourceSets.opensaml4Main.runtimeClasspath + sourceSets.opensaml5Main.runtimeClasspath
-	source += sourceSets.opensaml4Main.allJava
+	source += sourceSets.opensaml4Main.allJava + sourceSets.opensaml5Main.allJava
 }
 
 tasks.register("opensaml4Test", Test) {
@@ -122,8 +148,13 @@ tasks.register("opensaml4Test", Test) {
 	classpath += sourceSets.opensaml4Test.output
 }
 
+tasks.register("opensaml5Test", Test) {
+	useJUnitPlatform()
+	classpath += sourceSets.opensaml5Test.output
+}
 
 tasks.named("test") {
 	dependsOn opensaml4Test
+	dependsOn opensaml5Test
 }
 

saml2/saml2-service-provider/src/main/java/org/springframework/security/saml2/provider/service/authentication/BaseOpenSamlAuthenticationProvider.java

@@ -16,7 +16,6 @@
 
 package org.springframework.security.saml2.provider.service.authentication;
 
-import java.lang.reflect.Field;
 import java.time.Duration;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -85,7 +84,6 @@ import org.springframework.util.Assert;
 import org.springframework.util.CollectionUtils;
 import org.springframework.util.LinkedMultiValueMap;
 import org.springframework.util.MultiValueMap;
-import org.springframework.util.ReflectionUtils;
 import org.springframework.util.StringUtils;
 
 class BaseOpenSamlAuthenticationProvider implements AuthenticationProvider {
@@ -510,22 +508,11 @@ class BaseOpenSamlAuthenticationProvider implements AuthenticationProvider {
 				return Saml2ResponseValidatorResult.failure(new Saml2Error(errorCode, message));
 			}
 			String message = String.format("Invalid assertion [%s] for SAML response [%s]: %s", assertion.getID(),
-					((Response) assertion.getParent()).getID(), contextToString(context));
+					((Response) assertion.getParent()).getID(), context.getValidationFailureMessage());
 			return Saml2ResponseValidatorResult.failure(new Saml2Error(errorCode, message));
 		};
 	}
 
-	private static String contextToString(ValidationContext context) {
-		StringBuilder sb = new StringBuilder();
-		for (Field field : context.getClass().getDeclaredFields()) {
-			ReflectionUtils.makeAccessible(field);
-			Object value = ReflectionUtils.getField(field, context);
-			sb.append(field.getName() + " = " + value + ",");
-		}
-		sb.deleteCharAt(sb.length() - 1);
-		return sb.toString();
-	}
-
 	private static ValidationContext createValidationContext(AssertionToken assertionToken,
 			Consumer<Map<String, Object>> paramsConsumer) {
 		Saml2AuthenticationToken token = assertionToken.token;
@@ -566,7 +553,7 @@ class BaseOpenSamlAuthenticationProvider implements AuthenticationProvider {
 		return (serialized != null) ? serialized.getId() : null;
 	}
 
-	private static class SAML20AssertionValidators {
+	static class SAML20AssertionValidators {
 
 		private static final Collection<ConditionValidator> conditions = new ArrayList<>();
 
@@ -610,8 +597,8 @@ class BaseOpenSamlAuthenticationProvider implements AuthenticationProvider {
 			});
 		}
 
-		private static final SAML20AssertionValidator attributeValidator = new SAML20AssertionValidator(conditions,
+		static final SAML20AssertionValidator attributeValidator = new SAML20AssertionValidator(conditions, subjects,
-				subjects, statements, null, null, null) {
+				statements, null, null, null) {
 			@Nonnull
 			@Override
 			protected ValidationResult validateSignature(Assertion token, ValidationContext context) {

saml2/saml2-service-provider/src/main/java/org/springframework/security/saml2/provider/service/registration/BaseOpenSamlAssertingPartyMetadataRepository.java

@@ -16,41 +16,21 @@
 
 package org.springframework.security.saml2.provider.service.registration;
 
-import java.io.File;
-import java.io.IOException;
-import java.io.InputStream;
-import java.net.URI;
-import java.net.URL;
-import java.util.ArrayList;
-import java.util.Collection;
 import java.util.Iterator;
 import java.util.Set;
-import java.util.function.Consumer;
 import java.util.function.Supplier;
 
-import javax.annotation.Nonnull;
-
 import org.opensaml.core.criterion.EntityIdCriterion;
-import org.opensaml.core.xml.config.XMLObjectProviderRegistrySupport;
 import org.opensaml.saml.criterion.EntityRoleCriterion;
 import org.opensaml.saml.metadata.IterableMetadataSource;
 import org.opensaml.saml.metadata.resolver.MetadataResolver;
-import org.opensaml.saml.metadata.resolver.filter.impl.SignatureValidationFilter;
 import org.opensaml.saml.metadata.resolver.impl.AbstractBatchMetadataResolver;
 import org.opensaml.saml.metadata.resolver.impl.ResourceBackedMetadataResolver;
 import org.opensaml.saml.metadata.resolver.index.MetadataIndex;
 import org.opensaml.saml.metadata.resolver.index.impl.RoleMetadataIndex;
 import org.opensaml.saml.saml2.metadata.EntityDescriptor;
 import org.opensaml.saml.saml2.metadata.IDPSSODescriptor;
-import org.opensaml.security.credential.Credential;
-import org.opensaml.security.credential.impl.CollectionCredentialResolver;
-import org.opensaml.xmlsec.config.impl.DefaultSecurityConfigurationBootstrap;
-import org.opensaml.xmlsec.signature.support.SignatureTrustEngine;
-import org.opensaml.xmlsec.signature.support.impl.ExplicitKeySignatureTrustEngine;
 
-import org.springframework.core.io.DefaultResourceLoader;
-import org.springframework.core.io.Resource;
-import org.springframework.core.io.ResourceLoader;
 import org.springframework.lang.NonNull;
 import org.springframework.lang.Nullable;
 import org.springframework.security.saml2.Saml2Exception;
@@ -150,148 +130,16 @@ class BaseOpenSamlAssertingPartyMetadataRepository implements AssertingPartyMeta
 		}
 	}
 
-	/**
+	static MetadataResolver initialize(ResourceBackedMetadataResolver metadataResolver) {
-	 * A builder class for configuring
+		try {
-	 * {@link BaseOpenSamlAssertingPartyMetadataRepository} for a specific metadata
+			metadataResolver.setId(BaseOpenSamlAssertingPartyMetadataRepository.class.getName() + ".metadataResolver");
-	 * location.
+			metadataResolver.setIndexes(Set.of(new RoleMetadataIndex()));
-	 *
+			metadataResolver.initialize();
-	 * @author Josh Cummings
+			return metadataResolver;
-	 */
-	static final class MetadataLocationRepositoryBuilder {
-
-		private final String metadataLocation;
-
-		private final boolean requireVerificationCredentials;
-
-		private final Collection<Credential> verificationCredentials = new ArrayList<>();
-
-		private ResourceLoader resourceLoader = new DefaultResourceLoader();
-
-		MetadataLocationRepositoryBuilder(String metadataLocation, boolean trusted) {
-			this.metadataLocation = metadataLocation;
-			this.requireVerificationCredentials = !trusted;
 		}
-
+		catch (Exception ex) {
-		MetadataLocationRepositoryBuilder verificationCredentials(Consumer<Collection<Credential>> credentials) {
+			throw new Saml2Exception(ex);
-			credentials.accept(this.verificationCredentials);
-			return this;
 		}
-
-		MetadataLocationRepositoryBuilder resourceLoader(ResourceLoader resourceLoader) {
-			this.resourceLoader = resourceLoader;
-			return this;
-		}
-
-		MetadataResolver metadataResolver() {
-			ResourceBackedMetadataResolver metadataResolver = resourceBackedMetadataResolver();
-			if (!this.verificationCredentials.isEmpty()) {
-				SignatureTrustEngine engine = new ExplicitKeySignatureTrustEngine(
-						new CollectionCredentialResolver(this.verificationCredentials),
-						DefaultSecurityConfigurationBootstrap.buildBasicInlineKeyInfoCredentialResolver());
-				SignatureValidationFilter filter = new SignatureValidationFilter(engine);
-				filter.setRequireSignedRoot(true);
-				metadataResolver.setMetadataFilter(filter);
-				return initialize(metadataResolver);
-			}
-			Assert.isTrue(!this.requireVerificationCredentials, "Verification credentials are required");
-			return initialize(metadataResolver);
-		}
-
-		private ResourceBackedMetadataResolver resourceBackedMetadataResolver() {
-			Resource resource = this.resourceLoader.getResource(this.metadataLocation);
-			try {
-				return new ResourceBackedMetadataResolver(new SpringResource(resource));
-			}
-			catch (IOException ex) {
-				throw new Saml2Exception(ex);
-			}
-		}
-
-		private MetadataResolver initialize(ResourceBackedMetadataResolver metadataResolver) {
-			try {
-				metadataResolver.setId(this.getClass().getName() + ".metadataResolver");
-				metadataResolver.setParserPool(XMLObjectProviderRegistrySupport.getParserPool());
-				metadataResolver.setIndexes(Set.of(new RoleMetadataIndex()));
-				metadataResolver.initialize();
-				return metadataResolver;
-			}
-			catch (Exception ex) {
-				throw new Saml2Exception(ex);
-			}
-		}
-
-		private static final class SpringResource implements net.shibboleth.utilities.java.support.resource.Resource {
-
-			private final Resource resource;
-
-			SpringResource(Resource resource) {
-				this.resource = resource;
-			}
-
-			@Override
-			public boolean exists() {
-				return this.resource.exists();
-			}
-
-			@Override
-			public boolean isReadable() {
-				return this.resource.isReadable();
-			}
-
-			@Override
-			public boolean isOpen() {
-				return this.resource.isOpen();
-			}
-
-			@Override
-			public URL getURL() throws IOException {
-				return this.resource.getURL();
-			}
-
-			@Override
-			public URI getURI() throws IOException {
-				return this.resource.getURI();
-			}
-
-			@Override
-			public File getFile() throws IOException {
-				return this.resource.getFile();
-			}
-
-			@Nonnull
-			@Override
-			public InputStream getInputStream() throws IOException {
-				return this.resource.getInputStream();
-			}
-
-			@Override
-			public long contentLength() throws IOException {
-				return this.resource.contentLength();
-			}
-
-			@Override
-			public long lastModified() throws IOException {
-				return this.resource.lastModified();
-			}
-
-			@Override
-			public net.shibboleth.utilities.java.support.resource.Resource createRelativeResource(String relativePath)
-					throws IOException {
-				return new SpringResource(this.resource.createRelative(relativePath));
-			}
-
-			@Override
-			public String getFilename() {
-				return this.resource.getFilename();
-			}
-
-			@Override
-			public String getDescription() {
-				return this.resource.getDescription();
-			}
-
-		}
-
 	}
 
 	abstract static class MetadataResolverAdapter {

saml2/saml2-service-provider/src/main/java/org/springframework/security/saml2/provider/service/registration/OpenSamlMetadataUtils.java

@@ -20,9 +20,11 @@ import java.io.InputStream;
 import java.util.Collection;
 import java.util.Collections;
 
+import org.opensaml.core.Version;
 import org.opensaml.core.xml.XMLObject;
 import org.opensaml.core.xml.config.XMLObjectProviderRegistrySupport;
 import org.opensaml.core.xml.io.Unmarshaller;
+import org.opensaml.core.xml.io.UnmarshallerFactory;
 import org.opensaml.saml.saml2.metadata.EntitiesDescriptor;
 import org.opensaml.saml.saml2.metadata.EntityDescriptor;
 import org.w3c.dom.Document;
@@ -33,8 +35,27 @@ import org.springframework.security.saml2.core.OpenSamlInitializationService;
 
 final class OpenSamlMetadataUtils {
 
+	private static final OpenSamlDeserializer saml;
+
 	static {
 		OpenSamlInitializationService.initialize();
+		saml = resolveDeserializer();
+	}
+
+	static OpenSamlDeserializer resolveDeserializer() {
+		if (Version.getVersion().startsWith("4")) {
+			return new OpenSaml4Deserializer();
+		}
+		String opensaml5 = "org.springframework.security.saml2.provider.service.registration.OpenSaml5Template";
+		try {
+			Class<?> template = Class.forName(opensaml5);
+			OpenSamlOperations operations = (OpenSamlOperations) template.getDeclaredConstructor().newInstance();
+			return operations::deserialize;
+		}
+		catch (Exception ex) {
+			throw new IllegalStateException(
+					"Application appears to be using OpenSAML 5, but Spring's OpenSAML 5 support is not on the classpath");
+		}
 	}
 
 	private OpenSamlMetadataUtils() {
@@ -42,7 +63,7 @@ final class OpenSamlMetadataUtils {
 	}
 
 	static Collection<EntityDescriptor> descriptors(InputStream metadata) {
-		XMLObject object = xmlObject(metadata);
+		XMLObject object = saml.deserialize(metadata);
 		if (object instanceof EntityDescriptor descriptor) {
 			return Collections.singleton(descriptor);
 		}
@@ -52,28 +73,34 @@ final class OpenSamlMetadataUtils {
 		throw new Saml2Exception("Unsupported element type: " + object.getClass().getName());
 	}
 
-	static XMLObject xmlObject(InputStream inputStream) {
+	private interface OpenSamlDeserializer {
-		Document document = document(inputStream);
+
-		Element element = document.getDocumentElement();
+		XMLObject deserialize(InputStream serialized);
-		Unmarshaller unmarshaller = XMLObjectProviderRegistrySupport.getUnmarshallerFactory().getUnmarshaller(element);
+
-		if (unmarshaller == null) {
-			throw new Saml2Exception("Unsupported element of type " + element.getTagName());
-		}
-		try {
-			return unmarshaller.unmarshall(element);
-		}
-		catch (Exception ex) {
-			throw new Saml2Exception(ex);
-		}
 	}
 
-	static Document document(InputStream inputStream) {
+	private static class OpenSaml4Deserializer implements OpenSamlDeserializer {
-		try {
+
-			return XMLObjectProviderRegistrySupport.getParserPool().parse(inputStream);
+		@Override
-		}
+		public XMLObject deserialize(InputStream serialized) {
-		catch (Exception ex) {
+			try {
-			throw new Saml2Exception(ex);
+				Document document = XMLObjectProviderRegistrySupport.getParserPool().parse(serialized);
+				Element element = document.getDocumentElement();
+				UnmarshallerFactory factory = XMLObjectProviderRegistrySupport.getUnmarshallerFactory();
+				Unmarshaller unmarshaller = factory.getUnmarshaller(element);
+				if (unmarshaller == null) {
+					throw new Saml2Exception("Unsupported element of type " + element.getTagName());
+				}
+				return unmarshaller.unmarshall(element);
+			}
+			catch (Saml2Exception ex) {
+				throw ex;
+			}
+			catch (Exception ex) {
+				throw new Saml2Exception("Failed to deserialize payload", ex);
+			}
 		}
+
 	}
 
 }

saml2/saml2-service-provider/src/opensaml4Main/java/org/springframework/security/saml2/provider/service/registration/OpenSaml4AssertingPartyMetadataRepository.java

@@ -16,23 +16,40 @@
 
 package org.springframework.security.saml2.provider.service.registration;
 
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URI;
+import java.net.URL;
+import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Iterator;
 import java.util.function.Consumer;
 
+import javax.annotation.Nonnull;
+
 import net.shibboleth.utilities.java.support.resolver.CriteriaSet;
 import org.opensaml.core.criterion.EntityIdCriterion;
+import org.opensaml.core.xml.config.XMLObjectProviderRegistrySupport;
 import org.opensaml.saml.criterion.EntityRoleCriterion;
 import org.opensaml.saml.metadata.IterableMetadataSource;
 import org.opensaml.saml.metadata.resolver.MetadataResolver;
+import org.opensaml.saml.metadata.resolver.filter.impl.SignatureValidationFilter;
+import org.opensaml.saml.metadata.resolver.impl.ResourceBackedMetadataResolver;
 import org.opensaml.saml.metadata.resolver.index.impl.RoleMetadataIndex;
 import org.opensaml.saml.saml2.metadata.EntityDescriptor;
 import org.opensaml.security.credential.Credential;
+import org.opensaml.security.credential.impl.CollectionCredentialResolver;
+import org.opensaml.xmlsec.config.impl.DefaultSecurityConfigurationBootstrap;
+import org.opensaml.xmlsec.signature.support.SignatureTrustEngine;
+import org.opensaml.xmlsec.signature.support.impl.ExplicitKeySignatureTrustEngine;
 
+import org.springframework.core.io.DefaultResourceLoader;
+import org.springframework.core.io.Resource;
 import org.springframework.core.io.ResourceLoader;
 import org.springframework.lang.NonNull;
 import org.springframework.lang.Nullable;
-import org.springframework.security.saml2.core.Saml2X509Credential;
+import org.springframework.security.saml2.Saml2Exception;
 import org.springframework.security.saml2.provider.service.registration.BaseOpenSamlAssertingPartyMetadataRepository.MetadataResolverAdapter;
 import org.springframework.util.Assert;
 
@@ -145,48 +162,136 @@ public final class OpenSaml4AssertingPartyMetadataRepository implements Assertin
 	 */
 	public static final class MetadataLocationRepositoryBuilder {
 
-		private final BaseOpenSamlAssertingPartyMetadataRepository.MetadataLocationRepositoryBuilder builder;
+		private final String metadataLocation;
+
+		private final boolean requireVerificationCredentials;
+
+		private final Collection<Credential> verificationCredentials = new ArrayList<>();
+
+		private ResourceLoader resourceLoader = new DefaultResourceLoader();
 
 		MetadataLocationRepositoryBuilder(String metadataLocation, boolean trusted) {
-			this.builder = new BaseOpenSamlAssertingPartyMetadataRepository.MetadataLocationRepositoryBuilder(
+			this.metadataLocation = metadataLocation;
-					metadataLocation, trusted);
+			this.requireVerificationCredentials = !trusted;
 		}
 
-		/**
-		 * Apply this {@link Consumer} to the list of {@link Saml2X509Credential}s to use
-		 * for verifying metadata signatures.
-		 *
-		 * <p>
-		 * If no credentials are supplied, no signature verification is performed.
-		 * @param credentials a {@link Consumer} of the {@link Collection} of
-		 * {@link Saml2X509Credential}s
-		 * @return the
-		 * {@link BaseOpenSamlAssertingPartyMetadataRepository.MetadataLocationRepositoryBuilder}
-		 * for further configuration
-		 */
 		public MetadataLocationRepositoryBuilder verificationCredentials(Consumer<Collection<Credential>> credentials) {
-			this.builder.verificationCredentials(credentials);
+			credentials.accept(this.verificationCredentials);
 			return this;
 		}
 
-		/**
-		 * Use this {@link ResourceLoader} for resolving the {@code metadataLocation}
-		 * @param resourceLoader the {@link ResourceLoader} to use
-		 * @return the
-		 * {@link BaseOpenSamlAssertingPartyMetadataRepository.MetadataLocationRepositoryBuilder}
-		 * for further configuration
-		 */
 		public MetadataLocationRepositoryBuilder resourceLoader(ResourceLoader resourceLoader) {
-			this.builder.resourceLoader(resourceLoader);
+			this.resourceLoader = resourceLoader;
 			return this;
 		}
 
-		/**
-		 * Build the {@link OpenSaml4AssertingPartyMetadataRepository}
-		 * @return the {@link OpenSaml4AssertingPartyMetadataRepository}
-		 */
 		public OpenSaml4AssertingPartyMetadataRepository build() {
-			return new OpenSaml4AssertingPartyMetadataRepository(this.builder.metadataResolver());
+			return new OpenSaml4AssertingPartyMetadataRepository(metadataResolver());
+		}
+
+		private MetadataResolver metadataResolver() {
+			ResourceBackedMetadataResolver metadataResolver = resourceBackedMetadataResolver();
+			boolean missingCredentials = this.requireVerificationCredentials && this.verificationCredentials.isEmpty();
+			Assert.isTrue(!missingCredentials, "Verification credentials are required");
+			return initialize(metadataResolver);
+		}
+
+		private ResourceBackedMetadataResolver resourceBackedMetadataResolver() {
+			Resource resource = this.resourceLoader.getResource(this.metadataLocation);
+			try {
+				ResourceBackedMetadataResolver metadataResolver = new ResourceBackedMetadataResolver(
+						new SpringResource(resource));
+				if (this.verificationCredentials.isEmpty()) {
+					return metadataResolver;
+				}
+				SignatureTrustEngine engine = new ExplicitKeySignatureTrustEngine(
+						new CollectionCredentialResolver(this.verificationCredentials),
+						DefaultSecurityConfigurationBootstrap.buildBasicInlineKeyInfoCredentialResolver());
+				SignatureValidationFilter filter = new SignatureValidationFilter(engine);
+				filter.setRequireSignedRoot(true);
+				metadataResolver.setMetadataFilter(filter);
+				return metadataResolver;
+			}
+			catch (Exception ex) {
+				throw new Saml2Exception(ex);
+			}
+		}
+
+		private MetadataResolver initialize(ResourceBackedMetadataResolver metadataResolver) {
+			metadataResolver.setParserPool(XMLObjectProviderRegistrySupport.getParserPool());
+			return BaseOpenSamlAssertingPartyMetadataRepository.initialize(metadataResolver);
+		}
+
+		private static final class SpringResource implements net.shibboleth.utilities.java.support.resource.Resource {
+
+			private final Resource resource;
+
+			SpringResource(Resource resource) {
+				this.resource = resource;
+			}
+
+			@Override
+			public boolean exists() {
+				return this.resource.exists();
+			}
+
+			@Override
+			public boolean isReadable() {
+				return this.resource.isReadable();
+			}
+
+			@Override
+			public boolean isOpen() {
+				return this.resource.isOpen();
+			}
+
+			@Override
+			public URL getURL() throws IOException {
+				return this.resource.getURL();
+			}
+
+			@Override
+			public URI getURI() throws IOException {
+				return this.resource.getURI();
+			}
+
+			@Override
+			public File getFile() throws IOException {
+				return this.resource.getFile();
+			}
+
+			@Nonnull
+			@Override
+			public InputStream getInputStream() throws IOException {
+				return this.resource.getInputStream();
+			}
+
+			@Override
+			public long contentLength() throws IOException {
+				return this.resource.contentLength();
+			}
+
+			@Override
+			public long lastModified() throws IOException {
+				return this.resource.lastModified();
+			}
+
+			@Override
+			public net.shibboleth.utilities.java.support.resource.Resource createRelativeResource(String relativePath)
+					throws IOException {
+				return new SpringResource(this.resource.createRelative(relativePath));
+			}
+
+			@Override
+			public String getFilename() {
+				return this.resource.getFilename();
+			}
+
+			@Override
+			public String getDescription() {
+				return this.resource.getDescription();
+			}
+
 		}
 
 	}

saml2/saml2-service-provider/src/opensaml4Test/java/org/springframework/security/saml2/provider/service/authentication/OpenSaml4AuthenticationProviderTests.java

@@ -74,7 +74,7 @@ import org.springframework.security.saml2.core.Saml2ErrorCodes;
 import org.springframework.security.saml2.core.Saml2ResponseValidatorResult;
 import org.springframework.security.saml2.core.TestSaml2X509Credentials;
 import org.springframework.security.saml2.provider.service.authentication.OpenSaml4AuthenticationProvider.ResponseToken;
-import org.springframework.security.saml2.provider.service.authentication.TestCustomOpenSamlObjects.CustomOpenSamlObject;
+import org.springframework.security.saml2.provider.service.authentication.TestCustomOpenSaml4Objects.CustomOpenSamlObject;
 import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistration;
 import org.springframework.security.saml2.provider.service.registration.TestRelyingPartyRegistrations;
 import org.springframework.util.StringUtils;
@@ -349,7 +349,7 @@ public class OpenSaml4AuthenticationProviderTests {
 		Response response = response();
 		Assertion assertion = assertion();
 		AttributeStatement attribute = TestOpenSamlObjects.customAttributeStatement("Address",
-				TestCustomOpenSamlObjects.instance());
+				TestCustomOpenSaml4Objects.instance());
 		assertion.getAttributeStatements().add(attribute);
 		response.getAssertions().add(signed(assertion));
 		Saml2AuthenticationToken token = token(response, verifying(registration()));

saml2/saml2-service-provider/src/opensaml4Test/java/org/springframework/security/saml2/provider/service/authentication/TestCustomOpenSaml4Objects.java

@@ -42,20 +42,20 @@ import org.w3c.dom.Element;
 
 import org.springframework.security.saml2.core.OpenSamlInitializationService;
 
-public final class TestCustomOpenSamlObjects {
+public final class TestCustomOpenSaml4Objects {
 
 	static {
 		OpenSamlInitializationService.initialize();
 		XMLObjectProviderRegistrySupport.getMarshallerFactory()
 			.registerMarshaller(CustomOpenSamlObject.TYPE_NAME,
-					new TestCustomOpenSamlObjects.CustomSamlObjectMarshaller());
+					new TestCustomOpenSaml4Objects.CustomSamlObjectMarshaller());
 		XMLObjectProviderRegistrySupport.getUnmarshallerFactory()
 			.registerUnmarshaller(CustomOpenSamlObject.TYPE_NAME,
-					new TestCustomOpenSamlObjects.CustomSamlObjectUnmarshaller());
+					new TestCustomOpenSaml4Objects.CustomSamlObjectUnmarshaller());
 	}
 
 	public static CustomOpenSamlObject instance() {
-		CustomOpenSamlObject samlObject = new TestCustomOpenSamlObjects.CustomSamlObjectBuilder()
+		CustomOpenSamlObject samlObject = new TestCustomOpenSaml4Objects.CustomSamlObjectBuilder()
 			.buildObject(AttributeValue.DEFAULT_ELEMENT_NAME, CustomOpenSamlObject.TYPE_NAME);
 		XSAny street = new XSAnyBuilder().buildObject(CustomOpenSamlObject.CUSTOM_NS, "Street",
 				CustomOpenSamlObject.TYPE_CUSTOM_PREFIX);
@@ -76,7 +76,7 @@ public final class TestCustomOpenSamlObjects {
 		return samlObject;
 	}
 
-	private TestCustomOpenSamlObjects() {
+	private TestCustomOpenSaml4Objects() {
 
 	}
 

saml2/saml2-service-provider/src/opensaml5Main/java/org/springframework/security/saml2/internal/OpenSaml5Template.java

@@ -0,0 +1,617 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.internal;
+
+import java.io.ByteArrayInputStream;
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
+import java.security.PrivateKey;
+import java.security.cert.X509Certificate;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import javax.xml.namespace.QName;
+
+import net.shibboleth.shared.resolver.CriteriaSet;
+import net.shibboleth.shared.xml.SerializeSupport;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.opensaml.core.criterion.EntityIdCriterion;
+import org.opensaml.core.xml.XMLObject;
+import org.opensaml.core.xml.XMLObjectBuilder;
+import org.opensaml.core.xml.config.XMLObjectProviderRegistrySupport;
+import org.opensaml.core.xml.io.Marshaller;
+import org.opensaml.core.xml.io.MarshallingException;
+import org.opensaml.core.xml.io.Unmarshaller;
+import org.opensaml.core.xml.io.UnmarshallerFactory;
+import org.opensaml.core.xml.util.XMLObjectSupport;
+import org.opensaml.saml.common.xml.SAMLConstants;
+import org.opensaml.saml.criterion.ProtocolCriterion;
+import org.opensaml.saml.ext.saml2delrestrict.Delegate;
+import org.opensaml.saml.ext.saml2delrestrict.DelegationRestrictionType;
+import org.opensaml.saml.metadata.criteria.role.impl.EvaluableProtocolRoleDescriptorCriterion;
+import org.opensaml.saml.saml2.core.Assertion;
+import org.opensaml.saml.saml2.core.Attribute;
+import org.opensaml.saml.saml2.core.AttributeStatement;
+import org.opensaml.saml.saml2.core.Condition;
+import org.opensaml.saml.saml2.core.EncryptedAssertion;
+import org.opensaml.saml.saml2.core.EncryptedAttribute;
+import org.opensaml.saml.saml2.core.Issuer;
+import org.opensaml.saml.saml2.core.LogoutRequest;
+import org.opensaml.saml.saml2.core.NameID;
+import org.opensaml.saml.saml2.core.RequestAbstractType;
+import org.opensaml.saml.saml2.core.Response;
+import org.opensaml.saml.saml2.core.StatusResponseType;
+import org.opensaml.saml.saml2.core.Subject;
+import org.opensaml.saml.saml2.core.SubjectConfirmation;
+import org.opensaml.saml.saml2.encryption.Decrypter;
+import org.opensaml.saml.saml2.encryption.EncryptedElementTypeEncryptedKeyResolver;
+import org.opensaml.saml.security.impl.SAMLMetadataSignatureSigningParametersResolver;
+import org.opensaml.saml.security.impl.SAMLSignatureProfileValidator;
+import org.opensaml.security.SecurityException;
+import org.opensaml.security.credential.BasicCredential;
+import org.opensaml.security.credential.Credential;
+import org.opensaml.security.credential.CredentialResolver;
+import org.opensaml.security.credential.CredentialSupport;
+import org.opensaml.security.credential.UsageType;
+import org.opensaml.security.credential.criteria.impl.EvaluableEntityIDCredentialCriterion;
+import org.opensaml.security.credential.criteria.impl.EvaluableUsageCredentialCriterion;
+import org.opensaml.security.credential.impl.CollectionCredentialResolver;
+import org.opensaml.security.criteria.UsageCriterion;
+import org.opensaml.security.x509.BasicX509Credential;
+import org.opensaml.xmlsec.SignatureSigningParameters;
+import org.opensaml.xmlsec.SignatureSigningParametersResolver;
+import org.opensaml.xmlsec.config.impl.DefaultSecurityConfigurationBootstrap;
+import org.opensaml.xmlsec.criterion.SignatureSigningConfigurationCriterion;
+import org.opensaml.xmlsec.crypto.XMLSigningUtil;
+import org.opensaml.xmlsec.encryption.support.ChainingEncryptedKeyResolver;
+import org.opensaml.xmlsec.encryption.support.DecryptionException;
+import org.opensaml.xmlsec.encryption.support.EncryptedKeyResolver;
+import org.opensaml.xmlsec.encryption.support.InlineEncryptedKeyResolver;
+import org.opensaml.xmlsec.encryption.support.SimpleRetrievalMethodEncryptedKeyResolver;
+import org.opensaml.xmlsec.impl.BasicSignatureSigningConfiguration;
+import org.opensaml.xmlsec.keyinfo.KeyInfoCredentialResolver;
+import org.opensaml.xmlsec.keyinfo.KeyInfoGeneratorManager;
+import org.opensaml.xmlsec.keyinfo.NamedKeyInfoGeneratorManager;
+import org.opensaml.xmlsec.keyinfo.impl.CollectionKeyInfoCredentialResolver;
+import org.opensaml.xmlsec.keyinfo.impl.X509KeyInfoGeneratorFactory;
+import org.opensaml.xmlsec.signature.SignableXMLObject;
+import org.opensaml.xmlsec.signature.Signature;
+import org.opensaml.xmlsec.signature.support.SignatureConstants;
+import org.opensaml.xmlsec.signature.support.SignatureSupport;
+import org.opensaml.xmlsec.signature.support.SignatureTrustEngine;
+import org.opensaml.xmlsec.signature.support.impl.ExplicitKeySignatureTrustEngine;
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+
+import org.springframework.security.saml2.Saml2Exception;
+import org.springframework.security.saml2.core.Saml2Error;
+import org.springframework.security.saml2.core.Saml2ErrorCodes;
+import org.springframework.security.saml2.core.Saml2ParameterNames;
+import org.springframework.security.saml2.core.Saml2X509Credential;
+import org.springframework.util.Assert;
+import org.springframework.web.util.UriComponentsBuilder;
+import org.springframework.web.util.UriUtils;
+
+/**
+ * For internal use only. Subject to breaking changes at any time.
+ */
+final class OpenSaml5Template implements OpenSamlOperations {
+
+	private static final Log logger = LogFactory.getLog(OpenSaml5Template.class);
+
+	@Override
+	public <T extends XMLObject> T build(QName elementName) {
+		XMLObjectBuilder<?> builder = XMLObjectProviderRegistrySupport.getBuilderFactory().getBuilder(elementName);
+		if (builder == null) {
+			throw new Saml2Exception("Unable to resolve Builder for " + elementName);
+		}
+		return (T) builder.buildObject(elementName);
+	}
+
+	@Override
+	public <T extends XMLObject> T deserialize(String serialized) {
+		return deserialize(new ByteArrayInputStream(serialized.getBytes(StandardCharsets.UTF_8)));
+	}
+
+	@Override
+	public <T extends XMLObject> T deserialize(InputStream serialized) {
+		try {
+			Document document = XMLObjectProviderRegistrySupport.getParserPool().parse(serialized);
+			Element element = document.getDocumentElement();
+			UnmarshallerFactory factory = XMLObjectProviderRegistrySupport.getUnmarshallerFactory();
+			Unmarshaller unmarshaller = factory.getUnmarshaller(element);
+			if (unmarshaller == null) {
+				throw new Saml2Exception("Unsupported element of type " + element.getTagName());
+			}
+			return (T) unmarshaller.unmarshall(element);
+		}
+		catch (Saml2Exception ex) {
+			throw ex;
+		}
+		catch (Exception ex) {
+			throw new Saml2Exception("Failed to deserialize payload", ex);
+		}
+	}
+
+	@Override
+	public OpenSaml5SerializationConfigurer serialize(XMLObject object) {
+		Marshaller marshaller = XMLObjectProviderRegistrySupport.getMarshallerFactory().getMarshaller(object);
+		try {
+			return serialize(marshaller.marshall(object));
+		}
+		catch (MarshallingException ex) {
+			throw new Saml2Exception(ex);
+		}
+	}
+
+	@Override
+	public OpenSaml5SerializationConfigurer serialize(Element element) {
+		return new OpenSaml5SerializationConfigurer(element);
+	}
+
+	@Override
+	public OpenSaml5SignatureConfigurer withSigningKeys(Collection<Saml2X509Credential> credentials) {
+		return new OpenSaml5SignatureConfigurer(credentials);
+	}
+
+	@Override
+	public OpenSaml5VerificationConfigurer withVerificationKeys(Collection<Saml2X509Credential> credentials) {
+		return new OpenSaml5VerificationConfigurer(credentials);
+	}
+
+	@Override
+	public OpenSaml5DecryptionConfigurer withDecryptionKeys(Collection<Saml2X509Credential> credentials) {
+		return new OpenSaml5DecryptionConfigurer(credentials);
+	}
+
+	OpenSaml5Template() {
+
+	}
+
+	static final class OpenSaml5SerializationConfigurer
+			implements SerializationConfigurer<OpenSaml5SerializationConfigurer> {
+
+		private final Element element;
+
+		boolean pretty;
+
+		OpenSaml5SerializationConfigurer(Element element) {
+			this.element = element;
+		}
+
+		@Override
+		public OpenSaml5SerializationConfigurer prettyPrint(boolean pretty) {
+			this.pretty = pretty;
+			return this;
+		}
+
+		@Override
+		public String serialize() {
+			if (this.pretty) {
+				return SerializeSupport.prettyPrintXML(this.element);
+			}
+			return SerializeSupport.nodeToString(this.element);
+		}
+
+	}
+
+	static final class OpenSaml5SignatureConfigurer implements SignatureConfigurer<OpenSaml5SignatureConfigurer> {
+
+		private final Collection<Saml2X509Credential> credentials;
+
+		private final Map<String, String> components = new LinkedHashMap<>();
+
+		private List<String> algs = List.of(SignatureConstants.ALGO_ID_SIGNATURE_RSA_SHA256);
+
+		OpenSaml5SignatureConfigurer(Collection<Saml2X509Credential> credentials) {
+			this.credentials = credentials;
+		}
+
+		@Override
+		public OpenSaml5SignatureConfigurer algorithms(List<String> algs) {
+			this.algs = algs;
+			return this;
+		}
+
+		@Override
+		public <O extends SignableXMLObject> O sign(O object) {
+			SignatureSigningParameters parameters = resolveSigningParameters();
+			try {
+				SignatureSupport.signObject(object, parameters);
+			}
+			catch (Exception ex) {
+				throw new Saml2Exception(ex);
+			}
+			return object;
+		}
+
+		@Override
+		public Map<String, String> sign(Map<String, String> params) {
+			SignatureSigningParameters parameters = resolveSigningParameters();
+			this.components.putAll(params);
+			Credential credential = parameters.getSigningCredential();
+			String algorithmUri = parameters.getSignatureAlgorithm();
+			this.components.put(Saml2ParameterNames.SIG_ALG, algorithmUri);
+			UriComponentsBuilder builder = UriComponentsBuilder.newInstance();
+			for (Map.Entry<String, String> component : this.components.entrySet()) {
+				builder.queryParam(component.getKey(),
+						UriUtils.encode(component.getValue(), StandardCharsets.ISO_8859_1));
+			}
+			String queryString = builder.build(true).toString().substring(1);
+			try {
+				byte[] rawSignature = XMLSigningUtil.signWithURI(credential, algorithmUri,
+						queryString.getBytes(StandardCharsets.UTF_8));
+				String b64Signature = Saml2Utils.samlEncode(rawSignature);
+				this.components.put(Saml2ParameterNames.SIGNATURE, b64Signature);
+			}
+			catch (SecurityException ex) {
+				throw new Saml2Exception(ex);
+			}
+			return this.components;
+		}
+
+		private SignatureSigningParameters resolveSigningParameters() {
+			List<Credential> credentials = resolveSigningCredentials();
+			List<String> digests = Collections.singletonList(SignatureConstants.ALGO_ID_DIGEST_SHA256);
+			String canonicalization = SignatureConstants.ALGO_ID_C14N_EXCL_OMIT_COMMENTS;
+			SignatureSigningParametersResolver resolver = new SAMLMetadataSignatureSigningParametersResolver();
+			BasicSignatureSigningConfiguration signingConfiguration = new BasicSignatureSigningConfiguration();
+			signingConfiguration.setSigningCredentials(credentials);
+			signingConfiguration.setSignatureAlgorithms(this.algs);
+			signingConfiguration.setSignatureReferenceDigestMethods(digests);
+			signingConfiguration.setSignatureCanonicalizationAlgorithm(canonicalization);
+			signingConfiguration.setKeyInfoGeneratorManager(buildSignatureKeyInfoGeneratorManager());
+			CriteriaSet criteria = new CriteriaSet(new SignatureSigningConfigurationCriterion(signingConfiguration));
+			try {
+				SignatureSigningParameters parameters = resolver.resolveSingle(criteria);
+				Assert.notNull(parameters, "Failed to resolve any signing credential");
+				return parameters;
+			}
+			catch (Exception ex) {
+				throw new Saml2Exception(ex);
+			}
+		}
+
+		private NamedKeyInfoGeneratorManager buildSignatureKeyInfoGeneratorManager() {
+			final NamedKeyInfoGeneratorManager namedManager = new NamedKeyInfoGeneratorManager();
+
+			namedManager.setUseDefaultManager(true);
+			final KeyInfoGeneratorManager defaultManager = namedManager.getDefaultManager();
+
+			// Generator for X509Credentials
+			final X509KeyInfoGeneratorFactory x509Factory = new X509KeyInfoGeneratorFactory();
+			x509Factory.setEmitEntityCertificate(true);
+			x509Factory.setEmitEntityCertificateChain(true);
+
+			defaultManager.registerFactory(x509Factory);
+
+			return namedManager;
+		}
+
+		private List<Credential> resolveSigningCredentials() {
+			List<Credential> credentials = new ArrayList<>();
+			for (Saml2X509Credential x509Credential : this.credentials) {
+				X509Certificate certificate = x509Credential.getCertificate();
+				PrivateKey privateKey = x509Credential.getPrivateKey();
+				BasicCredential credential = CredentialSupport.getSimpleCredential(certificate, privateKey);
+				credential.setUsageType(UsageType.SIGNING);
+				credentials.add(credential);
+			}
+			return credentials;
+		}
+
+	}
+
+	static final class OpenSaml5VerificationConfigurer implements VerificationConfigurer {
+
+		private final Collection<Saml2X509Credential> credentials;
+
+		private String entityId;
+
+		OpenSaml5VerificationConfigurer(Collection<Saml2X509Credential> credentials) {
+			this.credentials = credentials;
+		}
+
+		@Override
+		public VerificationConfigurer entityId(String entityId) {
+			this.entityId = entityId;
+			return this;
+		}
+
+		private SignatureTrustEngine trustEngine(Collection<Saml2X509Credential> keys) {
+			Set<Credential> credentials = new HashSet<>();
+			for (Saml2X509Credential key : keys) {
+				BasicX509Credential cred = new BasicX509Credential(key.getCertificate());
+				cred.setUsageType(UsageType.SIGNING);
+				cred.setEntityId(this.entityId);
+				credentials.add(cred);
+			}
+			CredentialResolver credentialsResolver = new CollectionCredentialResolver(credentials);
+			return new ExplicitKeySignatureTrustEngine(credentialsResolver,
+					DefaultSecurityConfigurationBootstrap.buildBasicInlineKeyInfoCredentialResolver());
+		}
+
+		private CriteriaSet verificationCriteria(Issuer issuer) {
+			return new CriteriaSet(new EvaluableEntityIDCredentialCriterion(new EntityIdCriterion(issuer.getValue())),
+					new EvaluableProtocolRoleDescriptorCriterion(new ProtocolCriterion(SAMLConstants.SAML20P_NS)),
+					new EvaluableUsageCredentialCriterion(new UsageCriterion(UsageType.SIGNING)));
+		}
+
+		@Override
+		public Collection<Saml2Error> verify(SignableXMLObject signable) {
+			if (signable instanceof StatusResponseType response) {
+				return verifySignature(response.getID(), response.getIssuer(), response.getSignature());
+			}
+			if (signable instanceof RequestAbstractType request) {
+				return verifySignature(request.getID(), request.getIssuer(), request.getSignature());
+			}
+			if (signable instanceof Assertion assertion) {
+				return verifySignature(assertion.getID(), assertion.getIssuer(), assertion.getSignature());
+			}
+			throw new Saml2Exception("Unsupported object of type: " + signable.getClass().getName());
+		}
+
+		private Collection<Saml2Error> verifySignature(String id, Issuer issuer, Signature signature) {
+			SignatureTrustEngine trustEngine = trustEngine(this.credentials);
+			CriteriaSet criteria = verificationCriteria(issuer);
+			Collection<Saml2Error> errors = new ArrayList<>();
+			SAMLSignatureProfileValidator profileValidator = new SAMLSignatureProfileValidator();
+			try {
+				profileValidator.validate(signature);
+			}
+			catch (Exception ex) {
+				errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Invalid signature for object [" + id + "]: "));
+			}
+
+			try {
+				if (!trustEngine.validate(signature, criteria)) {
+					errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+							"Invalid signature for object [" + id + "]"));
+				}
+			}
+			catch (Exception ex) {
+				errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Invalid signature for object [" + id + "]: "));
+			}
+
+			return errors;
+		}
+
+		@Override
+		public Collection<Saml2Error> verify(RedirectParameters parameters) {
+			SignatureTrustEngine trustEngine = trustEngine(this.credentials);
+			CriteriaSet criteria = verificationCriteria(parameters.getIssuer());
+			if (parameters.getAlgorithm() == null) {
+				return Collections.singletonList(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Missing signature algorithm for object [" + parameters.getId() + "]"));
+			}
+			if (!parameters.hasSignature()) {
+				return Collections.singletonList(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Missing signature for object [" + parameters.getId() + "]"));
+			}
+			Collection<Saml2Error> errors = new ArrayList<>();
+			String algorithmUri = parameters.getAlgorithm();
+			try {
+				if (!trustEngine.validate(parameters.getSignature(), parameters.getContent(), algorithmUri, criteria,
+						null)) {
+					errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+							"Invalid signature for object [" + parameters.getId() + "]"));
+				}
+			}
+			catch (Exception ex) {
+				errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Invalid signature for object [" + parameters.getId() + "]: "));
+			}
+			return errors;
+		}
+
+	}
+
+	static final class OpenSaml5DecryptionConfigurer implements DecryptionConfigurer {
+
+		private static final EncryptedKeyResolver encryptedKeyResolver = new ChainingEncryptedKeyResolver(
+				Arrays.asList(new InlineEncryptedKeyResolver(), new EncryptedElementTypeEncryptedKeyResolver(),
+						new SimpleRetrievalMethodEncryptedKeyResolver()));
+
+		private final Decrypter decrypter;
+
+		OpenSaml5DecryptionConfigurer(Collection<Saml2X509Credential> decryptionCredentials) {
+			this.decrypter = decrypter(decryptionCredentials);
+		}
+
+		private static Decrypter decrypter(Collection<Saml2X509Credential> decryptionCredentials) {
+			Collection<Credential> credentials = new ArrayList<>();
+			for (Saml2X509Credential key : decryptionCredentials) {
+				Credential cred = CredentialSupport.getSimpleCredential(key.getCertificate(), key.getPrivateKey());
+				credentials.add(cred);
+			}
+			KeyInfoCredentialResolver resolver = new CollectionKeyInfoCredentialResolver(credentials);
+			Decrypter decrypter = new Decrypter(null, resolver, encryptedKeyResolver);
+			decrypter.setRootInNewDocument(true);
+			return decrypter;
+		}
+
+		@Override
+		public void decrypt(XMLObject object) {
+			if (object instanceof Response response) {
+				decryptResponse(response);
+				return;
+			}
+			if (object instanceof Assertion assertion) {
+				decryptAssertion(assertion);
+			}
+			if (object instanceof LogoutRequest request) {
+				decryptLogoutRequest(request);
+			}
+		}
+
+		/*
+		 * The methods that follow are adapted from OpenSAML's {@link DecryptAssertions},
+		 * {@link DecryptNameIDs}, and {@link DecryptAttributes}.
+		 *
+		 * <p>The reason that these OpenSAML classes are not used directly is because they
+		 * reference {@link javax.servlet.http.HttpServletRequest} which is a lower
+		 * Servlet API version than what Spring Security SAML uses.
+		 *
+		 * If OpenSAML 5 updates to {@link jakarta.servlet.http.HttpServletRequest}, then
+		 * this arrangement can be revisited.
+		 */
+
+		private void decryptResponse(Response response) {
+			Collection<Assertion> decrypteds = new ArrayList<>();
+			Collection<EncryptedAssertion> encrypteds = new ArrayList<>();
+
+			int count = 0;
+			int size = response.getEncryptedAssertions().size();
+			for (EncryptedAssertion encrypted : response.getEncryptedAssertions()) {
+				logger.trace(String.format("Decrypting EncryptedAssertion (%d/%d) in Response [%s]", count, size,
+						response.getID()));
+				try {
+					Assertion decrypted = this.decrypter.decrypt(encrypted);
+					if (decrypted != null) {
+						encrypteds.add(encrypted);
+						decrypteds.add(decrypted);
+					}
+					count++;
+				}
+				catch (DecryptionException ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+
+			response.getEncryptedAssertions().removeAll(encrypteds);
+			response.getAssertions().addAll(decrypteds);
+
+			// Re-marshall the response so that any ID attributes within the decrypted
+			// Assertions
+			// will have their ID-ness re-established at the DOM level.
+			if (!decrypteds.isEmpty()) {
+				try {
+					XMLObjectSupport.marshall(response);
+				}
+				catch (final MarshallingException ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+		}
+
+		private void decryptAssertion(Assertion assertion) {
+			for (AttributeStatement statement : assertion.getAttributeStatements()) {
+				decryptAttributes(statement);
+			}
+			decryptSubject(assertion.getSubject());
+			if (assertion.getConditions() != null) {
+				for (Condition c : assertion.getConditions().getConditions()) {
+					if (!(c instanceof DelegationRestrictionType delegation)) {
+						continue;
+					}
+					for (Delegate d : delegation.getDelegates()) {
+						if (d.getEncryptedID() != null) {
+							try {
+								NameID decrypted = (NameID) this.decrypter.decrypt(d.getEncryptedID());
+								if (decrypted != null) {
+									d.setNameID(decrypted);
+									d.setEncryptedID(null);
+								}
+							}
+							catch (DecryptionException ex) {
+								throw new Saml2Exception(ex);
+							}
+						}
+					}
+				}
+			}
+		}
+
+		private void decryptAttributes(AttributeStatement statement) {
+			Collection<Attribute> decrypteds = new ArrayList<>();
+			Collection<EncryptedAttribute> encrypteds = new ArrayList<>();
+			for (EncryptedAttribute encrypted : statement.getEncryptedAttributes()) {
+				try {
+					Attribute decrypted = this.decrypter.decrypt(encrypted);
+					if (decrypted != null) {
+						encrypteds.add(encrypted);
+						decrypteds.add(decrypted);
+					}
+				}
+				catch (Exception ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+			statement.getEncryptedAttributes().removeAll(encrypteds);
+			statement.getAttributes().addAll(decrypteds);
+		}
+
+		private void decryptSubject(Subject subject) {
+			if (subject != null) {
+				if (subject.getEncryptedID() != null) {
+					try {
+						NameID decrypted = (NameID) this.decrypter.decrypt(subject.getEncryptedID());
+						if (decrypted != null) {
+							subject.setNameID(decrypted);
+							subject.setEncryptedID(null);
+						}
+					}
+					catch (final DecryptionException ex) {
+						throw new Saml2Exception(ex);
+					}
+				}
+
+				for (final SubjectConfirmation sc : subject.getSubjectConfirmations()) {
+					if (sc.getEncryptedID() != null) {
+						try {
+							NameID decrypted = (NameID) this.decrypter.decrypt(sc.getEncryptedID());
+							if (decrypted != null) {
+								sc.setNameID(decrypted);
+								sc.setEncryptedID(null);
+							}
+						}
+						catch (final DecryptionException ex) {
+							throw new Saml2Exception(ex);
+						}
+					}
+				}
+			}
+		}
+
+		private void decryptLogoutRequest(LogoutRequest request) {
+			if (request.getEncryptedID() != null) {
+				try {
+					NameID decrypted = (NameID) this.decrypter.decrypt(request.getEncryptedID());
+					if (decrypted != null) {
+						request.setNameID(decrypted);
+						request.setEncryptedID(null);
+					}
+				}
+				catch (DecryptionException ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+		}
+
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Main/java/org/springframework/security/saml2/provider/service/authentication/OpenSaml5AuthenticationProvider.java

@@ -0,0 +1,496 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.authentication;
+
+import java.time.Duration;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.function.Consumer;
+
+import org.opensaml.saml.common.assertion.ValidationContext;
+import org.opensaml.saml.common.assertion.ValidationResult;
+import org.opensaml.saml.saml2.assertion.SAML20AssertionValidator;
+import org.opensaml.saml.saml2.assertion.SAML2AssertionValidationParameters;
+import org.opensaml.saml.saml2.core.Assertion;
+import org.opensaml.saml.saml2.core.EncryptedAssertion;
+import org.opensaml.saml.saml2.core.Response;
+import org.opensaml.saml.saml2.core.SubjectConfirmation;
+import org.opensaml.saml.saml2.core.SubjectConfirmationData;
+import org.opensaml.saml.saml2.encryption.Decrypter;
+
+import org.springframework.core.convert.converter.Converter;
+import org.springframework.security.authentication.AbstractAuthenticationToken;
+import org.springframework.security.authentication.AuthenticationProvider;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.AuthenticationException;
+import org.springframework.security.saml2.core.Saml2Error;
+import org.springframework.security.saml2.core.Saml2ErrorCodes;
+import org.springframework.security.saml2.core.Saml2ResponseValidatorResult;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistration;
+import org.springframework.util.Assert;
+import org.springframework.util.StringUtils;
+
+/**
+ * Implementation of {@link AuthenticationProvider} for SAML authentications when
+ * receiving a {@code Response} object containing an {@code Assertion}. This
+ * implementation uses the {@code OpenSAML 4} library.
+ *
+ * <p>
+ * The {@link OpenSaml5AuthenticationProvider} supports {@link Saml2AuthenticationToken}
+ * objects that contain a SAML response in its decoded XML format
+ * {@link Saml2AuthenticationToken#getSaml2Response()} along with the information about
+ * the asserting party, the identity provider (IDP), as well as the relying party, the
+ * service provider (SP, this application).
+ * <p>
+ * The {@link Saml2AuthenticationToken} will be processed into a SAML Response object. The
+ * SAML response object can be signed. If the Response is signed, a signature will not be
+ * required on the assertion.
+ * <p>
+ * While a response object can contain a list of assertion, this provider will only
+ * leverage the first valid assertion for the purpose of authentication. Assertions that
+ * do not pass validation will be ignored. If no valid assertions are found a
+ * {@link Saml2AuthenticationException} is thrown.
+ * <p>
+ * This provider supports two types of encrypted SAML elements
+ * <ul>
+ * <li><a href=
+ * "https://docs.oasis-open.org/security/saml/v2.0/saml-core-2.0-os.pdf#page=17">EncryptedAssertion</a></li>
+ * <li><a href=
+ * "https://docs.oasis-open.org/security/saml/v2.0/saml-core-2.0-os.pdf#page=14">EncryptedID</a></li>
+ * </ul>
+ * If the assertion is encrypted, then signature validation on the assertion is no longer
+ * required.
+ * <p>
+ * This provider does not perform an X509 certificate validation on the configured
+ * asserting party, IDP, verification certificates.
+ *
+ * @author Josh Cummings
+ * @since 5.5
+ * @see <a href=
+ * "https://docs.oasis-open.org/security/saml/v2.0/saml-core-2.0-os.pdf#page=38">SAML 2
+ * StatusResponse</a>
+ * @see <a href="https://shibboleth.atlassian.net/wiki/spaces/OSAML/overview">OpenSAML</a>
+ */
+public final class OpenSaml5AuthenticationProvider implements AuthenticationProvider {
+
+	private final BaseOpenSamlAuthenticationProvider delegate;
+
+	/**
+	 * Creates an {@link OpenSaml5AuthenticationProvider}
+	 */
+	public OpenSaml5AuthenticationProvider() {
+		this.delegate = new BaseOpenSamlAuthenticationProvider(new OpenSaml5Template());
+		setAssertionValidator(createDefaultAssertionValidator());
+	}
+
+	/**
+	 * Set the {@link Consumer} strategy to use for decrypting elements of a validated
+	 * {@link Response}. The default strategy decrypts all {@link EncryptedAssertion}s
+	 * using OpenSAML's {@link Decrypter}, adding the results to
+	 * {@link Response#getAssertions()}.
+	 *
+	 * You can use this method to configure the {@link Decrypter} instance like so:
+	 *
+	 * <pre>
+	 *	OpenSamlAuthenticationProvider provider = new OpenSamlAuthenticationProvider();
+	 *	provider.setResponseElementsDecrypter((responseToken) -&gt; {
+	 *	    DecrypterParameters parameters = new DecrypterParameters();
+	 *	    // ... set parameters as needed
+	 *	    Decrypter decrypter = new Decrypter(parameters);
+	 *		Response response = responseToken.getResponse();
+	 *  	EncryptedAssertion encrypted = response.getEncryptedAssertions().get(0);
+	 *  	try {
+	 *  		Assertion assertion = decrypter.decrypt(encrypted);
+	 *  		response.getAssertions().add(assertion);
+	 *  	} catch (Exception e) {
+	 *  	 	throw new Saml2AuthenticationException(...);
+	 *  	}
+	 *	});
+	 * </pre>
+	 *
+	 * Or, in the event that you have your own custom decryption interface, the same
+	 * pattern applies:
+	 *
+	 * <pre>
+	 *	OpenSamlAuthenticationProvider provider = new OpenSamlAuthenticationProvider();
+	 *	Converter&lt;EncryptedAssertion, Assertion&gt; myService = ...
+	 *	provider.setResponseDecrypter((responseToken) -&gt; {
+	 *	   Response response = responseToken.getResponse();
+	 *	   response.getEncryptedAssertions().stream()
+	 *	   		.map(service::decrypt).forEach(response.getAssertions()::add);
+	 *	});
+	 * </pre>
+	 *
+	 * This is valuable when using an external service to perform the decryption.
+	 * @param responseElementsDecrypter the {@link Consumer} for decrypting response
+	 * elements
+	 * @since 5.5
+	 */
+	public void setResponseElementsDecrypter(Consumer<ResponseToken> responseElementsDecrypter) {
+		Assert.notNull(responseElementsDecrypter, "responseElementsDecrypter cannot be null");
+		this.delegate
+			.setResponseElementsDecrypter((token) -> responseElementsDecrypter.accept(new ResponseToken(token)));
+	}
+
+	/**
+	 * Set the {@link Converter} to use for validating the SAML 2.0 Response.
+	 *
+	 * You can still invoke the default validator by delegating to
+	 * {@link #createDefaultResponseValidator()}, like so:
+	 *
+	 * <pre>
+	 * OpenSaml4AuthenticationProvider provider = new OpenSaml4AuthenticationProvider();
+	 * provider.setResponseValidator(responseToken -&gt; {
+	 * 		Saml2ResponseValidatorResult result = createDefaultResponseValidator()
+	 * 			.convert(responseToken)
+	 * 		return result.concat(myCustomValidator.convert(responseToken));
+	 * });
+	 * </pre>
+	 * @param responseValidator the {@link Converter} to use
+	 * @since 5.6
+	 */
+	public void setResponseValidator(Converter<ResponseToken, Saml2ResponseValidatorResult> responseValidator) {
+		Assert.notNull(responseValidator, "responseValidator cannot be null");
+		this.delegate.setResponseValidator((token) -> responseValidator.convert(new ResponseToken(token)));
+	}
+
+	/**
+	 * Set the {@link Converter} to use for validating each {@link Assertion} in the SAML
+	 * 2.0 Response.
+	 *
+	 * You can still invoke the default validator by delgating to
+	 * {@link #createAssertionValidator}, like so:
+	 *
+	 * <pre>
+	 *	OpenSamlAuthenticationProvider provider = new OpenSamlAuthenticationProvider();
+	 *  provider.setAssertionValidator(assertionToken -&gt; {
+	 *		Saml2ResponseValidatorResult result = createDefaultAssertionValidator()
+	 *			.convert(assertionToken)
+	 *		return result.concat(myCustomValidator.convert(assertionToken));
+	 *  });
+	 * </pre>
+	 *
+	 * You can also use this method to configure the provider to use a different
+	 * {@link ValidationContext} from the default, like so:
+	 *
+	 * <pre>
+	 *	OpenSamlAuthenticationProvider provider = new OpenSamlAuthenticationProvider();
+	 *	provider.setAssertionValidator(
+	 *		createDefaultAssertionValidator(assertionToken -&gt; {
+	 *			Map&lt;String, Object&gt; params = new HashMap&lt;&gt;();
+	 *			params.put(CLOCK_SKEW, 2 * 60 * 1000);
+	 *			// other parameters
+	 *			return new ValidationContext(params);
+	 *		}));
+	 * </pre>
+	 *
+	 * Consider taking a look at {@link #createValidationContext} to see how it constructs
+	 * a {@link ValidationContext}.
+	 *
+	 * It is not necessary to delegate to the default validator. You can safely replace it
+	 * entirely with your own. Note that signature verification is performed as a separate
+	 * step from this validator.
+	 * @param assertionValidator the validator to use
+	 * @since 5.4
+	 */
+	public void setAssertionValidator(Converter<AssertionToken, Saml2ResponseValidatorResult> assertionValidator) {
+		Assert.notNull(assertionValidator, "assertionValidator cannot be null");
+		this.delegate.setAssertionValidator((token) -> assertionValidator.convert(new AssertionToken(token)));
+	}
+
+	/**
+	 * Set the {@link Consumer} strategy to use for decrypting elements of a validated
+	 * {@link Assertion}.
+	 *
+	 * You can use this method to configure the {@link Decrypter} used like so:
+	 *
+	 * <pre>
+	 *	OpenSamlAuthenticationProvider provider = new OpenSamlAuthenticationProvider();
+	 *	provider.setResponseDecrypter((assertionToken) -&gt; {
+	 *	    DecrypterParameters parameters = new DecrypterParameters();
+	 *	    // ... set parameters as needed
+	 *	    Decrypter decrypter = new Decrypter(parameters);
+	 *		Assertion assertion = assertionToken.getAssertion();
+	 *  	EncryptedID encrypted = assertion.getSubject().getEncryptedID();
+	 *  	try {
+	 *  		NameID name = decrypter.decrypt(encrypted);
+	 *  		assertion.getSubject().setNameID(name);
+	 *  	} catch (Exception e) {
+	 *  	 	throw new Saml2AuthenticationException(...);
+	 *  	}
+	 *	});
+	 * </pre>
+	 *
+	 * Or, in the event that you have your own custom interface, the same pattern applies:
+	 *
+	 * <pre>
+	 *	OpenSamlAuthenticationProvider provider = new OpenSamlAuthenticationProvider();
+	 *	MyDecryptionService myService = ...
+	 *	provider.setResponseDecrypter((responseToken) -&gt; {
+	 *	   	Assertion assertion = assertionToken.getAssertion();
+	 *	   	EncryptedID encrypted = assertion.getSubject().getEncryptedID();
+	 *		NameID name = myService.decrypt(encrypted);
+	 *		assertion.getSubject().setNameID(name);
+	 *	});
+	 * </pre>
+	 * @param assertionDecrypter the {@link Consumer} for decrypting assertion elements
+	 * @since 5.5
+	 */
+	public void setAssertionElementsDecrypter(Consumer<AssertionToken> assertionDecrypter) {
+		Assert.notNull(assertionDecrypter, "assertionDecrypter cannot be null");
+		this.delegate.setAssertionElementsDecrypter((token) -> assertionDecrypter.accept(new AssertionToken(token)));
+	}
+
+	/**
+	 * Set the {@link Converter} to use for converting a validated {@link Response} into
+	 * an {@link AbstractAuthenticationToken}.
+	 *
+	 * You can delegate to the default behavior by calling
+	 * {@link #createDefaultResponseAuthenticationConverter()} like so:
+	 *
+	 * <pre>
+	 *	OpenSamlAuthenticationProvider provider = new OpenSamlAuthenticationProvider();
+	 * 	Converter&lt;ResponseToken, Saml2Authentication&gt; authenticationConverter =
+	 * 			createDefaultResponseAuthenticationConverter();
+	 *	provider.setResponseAuthenticationConverter(responseToken -&gt; {
+	 *		Saml2Authentication authentication = authenticationConverter.convert(responseToken);
+	 *		User user = myUserRepository.findByUsername(authentication.getName());
+	 *		return new MyAuthentication(authentication, user);
+	 *	});
+	 * </pre>
+	 * @param responseAuthenticationConverter the {@link Converter} to use
+	 * @since 5.4
+	 */
+	public void setResponseAuthenticationConverter(
+			Converter<ResponseToken, ? extends AbstractAuthenticationToken> responseAuthenticationConverter) {
+		Assert.notNull(responseAuthenticationConverter, "responseAuthenticationConverter cannot be null");
+		this.delegate.setResponseAuthenticationConverter(
+				(token) -> responseAuthenticationConverter.convert(new ResponseToken(token)));
+	}
+
+	/**
+	 * Construct a default strategy for validating the SAML 2.0 Response
+	 * @return the default response validator strategy
+	 * @since 5.6
+	 */
+	public static Converter<ResponseToken, Saml2ResponseValidatorResult> createDefaultResponseValidator() {
+		Converter<BaseOpenSamlAuthenticationProvider.ResponseToken, Saml2ResponseValidatorResult> delegate = BaseOpenSamlAuthenticationProvider
+			.createDefaultResponseValidator();
+		return (token) -> delegate
+			.convert(new BaseOpenSamlAuthenticationProvider.ResponseToken(token.getResponse(), token.getToken()));
+	}
+
+	/**
+	 * Construct a default strategy for validating each SAML 2.0 Assertion and associated
+	 * {@link Authentication} token
+	 * @return the default assertion validator strategy
+	 */
+	public static Converter<AssertionToken, Saml2ResponseValidatorResult> createDefaultAssertionValidator() {
+		return createDefaultAssertionValidatorWithParameters(
+				(params) -> params.put(SAML2AssertionValidationParameters.CLOCK_SKEW, Duration.ofMinutes(5)));
+	}
+
+	/**
+	 * Construct a default strategy for validating each SAML 2.0 Assertion and associated
+	 * {@link Authentication} token
+	 * @param contextConverter the conversion strategy to use to generate a
+	 * {@link ValidationContext} for each assertion being validated
+	 * @return the default assertion validator strategy
+	 * @deprecated Use {@link #createDefaultAssertionValidatorWithParameters} instead
+	 */
+	@Deprecated
+	public static Converter<AssertionToken, Saml2ResponseValidatorResult> createDefaultAssertionValidator(
+			Converter<AssertionToken, ValidationContext> contextConverter) {
+		return createAssertionValidator(Saml2ErrorCodes.INVALID_ASSERTION,
+				(assertionToken) -> BaseOpenSamlAuthenticationProvider.SAML20AssertionValidators.attributeValidator,
+				contextConverter);
+	}
+
+	/**
+	 * Construct a default strategy for validating each SAML 2.0 Assertion and associated
+	 * {@link Authentication} token
+	 * @param validationContextParameters a consumer for editing the values passed to the
+	 * {@link ValidationContext} for each assertion being validated
+	 * @return the default assertion validator strategy
+	 * @since 5.8
+	 */
+	public static Converter<AssertionToken, Saml2ResponseValidatorResult> createDefaultAssertionValidatorWithParameters(
+			Consumer<Map<String, Object>> validationContextParameters) {
+		return createAssertionValidator(Saml2ErrorCodes.INVALID_ASSERTION,
+				(assertionToken) -> BaseOpenSamlAuthenticationProvider.SAML20AssertionValidators.attributeValidator,
+				(assertionToken) -> createValidationContext(assertionToken, validationContextParameters));
+	}
+
+	/**
+	 * Construct a default strategy for converting a SAML 2.0 Response and
+	 * {@link Authentication} token into a {@link Saml2Authentication}
+	 * @return the default response authentication converter strategy
+	 */
+	public static Converter<ResponseToken, Saml2Authentication> createDefaultResponseAuthenticationConverter() {
+		Converter<BaseOpenSamlAuthenticationProvider.ResponseToken, Saml2Authentication> delegate = BaseOpenSamlAuthenticationProvider
+			.createDefaultResponseAuthenticationConverter();
+		return (token) -> delegate
+			.convert(new BaseOpenSamlAuthenticationProvider.ResponseToken(token.getResponse(), token.getToken()));
+	}
+
+	/**
+	 * @param authentication the authentication request object, must be of type
+	 * {@link Saml2AuthenticationToken}
+	 * @return {@link Saml2Authentication} if the assertion is valid
+	 * @throws AuthenticationException if a validation exception occurs
+	 */
+	@Override
+	public Authentication authenticate(Authentication authentication) throws AuthenticationException {
+		return this.delegate.authenticate(authentication);
+	}
+
+	@Override
+	public boolean supports(Class<?> authentication) {
+		return authentication != null && Saml2AuthenticationToken.class.isAssignableFrom(authentication);
+	}
+
+	private static Converter<AssertionToken, Saml2ResponseValidatorResult> createAssertionValidator(String errorCode,
+			Converter<AssertionToken, SAML20AssertionValidator> validatorConverter,
+			Converter<AssertionToken, ValidationContext> contextConverter) {
+
+		return (assertionToken) -> {
+			Assertion assertion = assertionToken.getAssertion();
+			SAML20AssertionValidator validator = validatorConverter.convert(assertionToken);
+			ValidationContext context = contextConverter.convert(assertionToken);
+			try {
+				ValidationResult result = validator.validate(assertion, context);
+				if (result == ValidationResult.VALID) {
+					return Saml2ResponseValidatorResult.success();
+				}
+			}
+			catch (Exception ex) {
+				String message = String.format("Invalid assertion [%s] for SAML response [%s]: %s", assertion.getID(),
+						((Response) assertion.getParent()).getID(), ex.getMessage());
+				return Saml2ResponseValidatorResult.failure(new Saml2Error(errorCode, message));
+			}
+			String message = String.format("Invalid assertion [%s] for SAML response [%s]: %s", assertion.getID(),
+					((Response) assertion.getParent()).getID(), context.getValidationFailureMessages());
+			return Saml2ResponseValidatorResult.failure(new Saml2Error(errorCode, message));
+		};
+	}
+
+	private static ValidationContext createValidationContext(AssertionToken assertionToken,
+			Consumer<Map<String, Object>> paramsConsumer) {
+		Saml2AuthenticationToken token = assertionToken.getToken();
+		RelyingPartyRegistration relyingPartyRegistration = token.getRelyingPartyRegistration();
+		String audience = relyingPartyRegistration.getEntityId();
+		String recipient = relyingPartyRegistration.getAssertionConsumerServiceLocation();
+		String assertingPartyEntityId = relyingPartyRegistration.getAssertingPartyMetadata().getEntityId();
+		Map<String, Object> params = new HashMap<>();
+		Assertion assertion = assertionToken.getAssertion();
+		if (assertionContainsInResponseTo(assertion)) {
+			String requestId = getAuthnRequestId(token.getAuthenticationRequest());
+			params.put(SAML2AssertionValidationParameters.SC_VALID_IN_RESPONSE_TO, requestId);
+		}
+		params.put(SAML2AssertionValidationParameters.COND_VALID_AUDIENCES, Collections.singleton(audience));
+		params.put(SAML2AssertionValidationParameters.SC_VALID_RECIPIENTS, Collections.singleton(recipient));
+		params.put(SAML2AssertionValidationParameters.VALID_ISSUERS, Collections.singleton(assertingPartyEntityId));
+		paramsConsumer.accept(params);
+		return new ValidationContext(params);
+	}
+
+	private static boolean assertionContainsInResponseTo(Assertion assertion) {
+		if (assertion.getSubject() == null) {
+			return false;
+		}
+		for (SubjectConfirmation confirmation : assertion.getSubject().getSubjectConfirmations()) {
+			SubjectConfirmationData confirmationData = confirmation.getSubjectConfirmationData();
+			if (confirmationData == null) {
+				continue;
+			}
+			if (StringUtils.hasText(confirmationData.getInResponseTo())) {
+				return true;
+			}
+		}
+		return false;
+	}
+
+	private static String getAuthnRequestId(AbstractSaml2AuthenticationRequest serialized) {
+		return (serialized != null) ? serialized.getId() : null;
+	}
+
+	/**
+	 * A tuple containing an OpenSAML {@link Response} and its associated authentication
+	 * token.
+	 *
+	 * @since 5.4
+	 */
+	public static class ResponseToken {
+
+		private final Saml2AuthenticationToken token;
+
+		private final Response response;
+
+		ResponseToken(Response response, Saml2AuthenticationToken token) {
+			this.token = token;
+			this.response = response;
+		}
+
+		ResponseToken(BaseOpenSamlAuthenticationProvider.ResponseToken token) {
+			this.token = token.getToken();
+			this.response = token.getResponse();
+		}
+
+		public Response getResponse() {
+			return this.response;
+		}
+
+		public Saml2AuthenticationToken getToken() {
+			return this.token;
+		}
+
+	}
+
+	/**
+	 * A tuple containing an OpenSAML {@link Assertion} and its associated authentication
+	 * token.
+	 *
+	 * @since 5.4
+	 */
+	public static class AssertionToken {
+
+		private final Saml2AuthenticationToken token;
+
+		private final Assertion assertion;
+
+		AssertionToken(Assertion assertion, Saml2AuthenticationToken token) {
+			this.token = token;
+			this.assertion = assertion;
+		}
+
+		AssertionToken(BaseOpenSamlAuthenticationProvider.AssertionToken token) {
+			this.token = token.getToken();
+			this.assertion = token.getAssertion();
+		}
+
+		public Assertion getAssertion() {
+			return this.assertion;
+		}
+
+		public Saml2AuthenticationToken getToken() {
+			return this.token;
+		}
+
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Main/java/org/springframework/security/saml2/provider/service/authentication/OpenSaml5Template.java

@@ -0,0 +1,617 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.authentication;
+
+import java.io.ByteArrayInputStream;
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
+import java.security.PrivateKey;
+import java.security.cert.X509Certificate;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import javax.xml.namespace.QName;
+
+import net.shibboleth.shared.resolver.CriteriaSet;
+import net.shibboleth.shared.xml.SerializeSupport;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.opensaml.core.criterion.EntityIdCriterion;
+import org.opensaml.core.xml.XMLObject;
+import org.opensaml.core.xml.XMLObjectBuilder;
+import org.opensaml.core.xml.config.XMLObjectProviderRegistrySupport;
+import org.opensaml.core.xml.io.Marshaller;
+import org.opensaml.core.xml.io.MarshallingException;
+import org.opensaml.core.xml.io.Unmarshaller;
+import org.opensaml.core.xml.io.UnmarshallerFactory;
+import org.opensaml.core.xml.util.XMLObjectSupport;
+import org.opensaml.saml.common.xml.SAMLConstants;
+import org.opensaml.saml.criterion.ProtocolCriterion;
+import org.opensaml.saml.ext.saml2delrestrict.Delegate;
+import org.opensaml.saml.ext.saml2delrestrict.DelegationRestrictionType;
+import org.opensaml.saml.metadata.criteria.role.impl.EvaluableProtocolRoleDescriptorCriterion;
+import org.opensaml.saml.saml2.core.Assertion;
+import org.opensaml.saml.saml2.core.Attribute;
+import org.opensaml.saml.saml2.core.AttributeStatement;
+import org.opensaml.saml.saml2.core.Condition;
+import org.opensaml.saml.saml2.core.EncryptedAssertion;
+import org.opensaml.saml.saml2.core.EncryptedAttribute;
+import org.opensaml.saml.saml2.core.Issuer;
+import org.opensaml.saml.saml2.core.LogoutRequest;
+import org.opensaml.saml.saml2.core.NameID;
+import org.opensaml.saml.saml2.core.RequestAbstractType;
+import org.opensaml.saml.saml2.core.Response;
+import org.opensaml.saml.saml2.core.StatusResponseType;
+import org.opensaml.saml.saml2.core.Subject;
+import org.opensaml.saml.saml2.core.SubjectConfirmation;
+import org.opensaml.saml.saml2.encryption.Decrypter;
+import org.opensaml.saml.saml2.encryption.EncryptedElementTypeEncryptedKeyResolver;
+import org.opensaml.saml.security.impl.SAMLMetadataSignatureSigningParametersResolver;
+import org.opensaml.saml.security.impl.SAMLSignatureProfileValidator;
+import org.opensaml.security.SecurityException;
+import org.opensaml.security.credential.BasicCredential;
+import org.opensaml.security.credential.Credential;
+import org.opensaml.security.credential.CredentialResolver;
+import org.opensaml.security.credential.CredentialSupport;
+import org.opensaml.security.credential.UsageType;
+import org.opensaml.security.credential.criteria.impl.EvaluableEntityIDCredentialCriterion;
+import org.opensaml.security.credential.criteria.impl.EvaluableUsageCredentialCriterion;
+import org.opensaml.security.credential.impl.CollectionCredentialResolver;
+import org.opensaml.security.criteria.UsageCriterion;
+import org.opensaml.security.x509.BasicX509Credential;
+import org.opensaml.xmlsec.SignatureSigningParameters;
+import org.opensaml.xmlsec.SignatureSigningParametersResolver;
+import org.opensaml.xmlsec.config.impl.DefaultSecurityConfigurationBootstrap;
+import org.opensaml.xmlsec.criterion.SignatureSigningConfigurationCriterion;
+import org.opensaml.xmlsec.crypto.XMLSigningUtil;
+import org.opensaml.xmlsec.encryption.support.ChainingEncryptedKeyResolver;
+import org.opensaml.xmlsec.encryption.support.DecryptionException;
+import org.opensaml.xmlsec.encryption.support.EncryptedKeyResolver;
+import org.opensaml.xmlsec.encryption.support.InlineEncryptedKeyResolver;
+import org.opensaml.xmlsec.encryption.support.SimpleRetrievalMethodEncryptedKeyResolver;
+import org.opensaml.xmlsec.impl.BasicSignatureSigningConfiguration;
+import org.opensaml.xmlsec.keyinfo.KeyInfoCredentialResolver;
+import org.opensaml.xmlsec.keyinfo.KeyInfoGeneratorManager;
+import org.opensaml.xmlsec.keyinfo.NamedKeyInfoGeneratorManager;
+import org.opensaml.xmlsec.keyinfo.impl.CollectionKeyInfoCredentialResolver;
+import org.opensaml.xmlsec.keyinfo.impl.X509KeyInfoGeneratorFactory;
+import org.opensaml.xmlsec.signature.SignableXMLObject;
+import org.opensaml.xmlsec.signature.Signature;
+import org.opensaml.xmlsec.signature.support.SignatureConstants;
+import org.opensaml.xmlsec.signature.support.SignatureSupport;
+import org.opensaml.xmlsec.signature.support.SignatureTrustEngine;
+import org.opensaml.xmlsec.signature.support.impl.ExplicitKeySignatureTrustEngine;
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+
+import org.springframework.security.saml2.Saml2Exception;
+import org.springframework.security.saml2.core.Saml2Error;
+import org.springframework.security.saml2.core.Saml2ErrorCodes;
+import org.springframework.security.saml2.core.Saml2ParameterNames;
+import org.springframework.security.saml2.core.Saml2X509Credential;
+import org.springframework.util.Assert;
+import org.springframework.web.util.UriComponentsBuilder;
+import org.springframework.web.util.UriUtils;
+
+/**
+ * For internal use only. Subject to breaking changes at any time.
+ */
+final class OpenSaml5Template implements OpenSamlOperations {
+
+	private static final Log logger = LogFactory.getLog(OpenSaml5Template.class);
+
+	@Override
+	public <T extends XMLObject> T build(QName elementName) {
+		XMLObjectBuilder<?> builder = XMLObjectProviderRegistrySupport.getBuilderFactory().getBuilder(elementName);
+		if (builder == null) {
+			throw new Saml2Exception("Unable to resolve Builder for " + elementName);
+		}
+		return (T) builder.buildObject(elementName);
+	}
+
+	@Override
+	public <T extends XMLObject> T deserialize(String serialized) {
+		return deserialize(new ByteArrayInputStream(serialized.getBytes(StandardCharsets.UTF_8)));
+	}
+
+	@Override
+	public <T extends XMLObject> T deserialize(InputStream serialized) {
+		try {
+			Document document = XMLObjectProviderRegistrySupport.getParserPool().parse(serialized);
+			Element element = document.getDocumentElement();
+			UnmarshallerFactory factory = XMLObjectProviderRegistrySupport.getUnmarshallerFactory();
+			Unmarshaller unmarshaller = factory.getUnmarshaller(element);
+			if (unmarshaller == null) {
+				throw new Saml2Exception("Unsupported element of type " + element.getTagName());
+			}
+			return (T) unmarshaller.unmarshall(element);
+		}
+		catch (Saml2Exception ex) {
+			throw ex;
+		}
+		catch (Exception ex) {
+			throw new Saml2Exception("Failed to deserialize payload", ex);
+		}
+	}
+
+	@Override
+	public OpenSaml5SerializationConfigurer serialize(XMLObject object) {
+		Marshaller marshaller = XMLObjectProviderRegistrySupport.getMarshallerFactory().getMarshaller(object);
+		try {
+			return serialize(marshaller.marshall(object));
+		}
+		catch (MarshallingException ex) {
+			throw new Saml2Exception(ex);
+		}
+	}
+
+	@Override
+	public OpenSaml5SerializationConfigurer serialize(Element element) {
+		return new OpenSaml5SerializationConfigurer(element);
+	}
+
+	@Override
+	public OpenSaml5SignatureConfigurer withSigningKeys(Collection<Saml2X509Credential> credentials) {
+		return new OpenSaml5SignatureConfigurer(credentials);
+	}
+
+	@Override
+	public OpenSaml5VerificationConfigurer withVerificationKeys(Collection<Saml2X509Credential> credentials) {
+		return new OpenSaml5VerificationConfigurer(credentials);
+	}
+
+	@Override
+	public OpenSaml5DecryptionConfigurer withDecryptionKeys(Collection<Saml2X509Credential> credentials) {
+		return new OpenSaml5DecryptionConfigurer(credentials);
+	}
+
+	OpenSaml5Template() {
+
+	}
+
+	static final class OpenSaml5SerializationConfigurer
+			implements SerializationConfigurer<OpenSaml5SerializationConfigurer> {
+
+		private final Element element;
+
+		boolean pretty;
+
+		OpenSaml5SerializationConfigurer(Element element) {
+			this.element = element;
+		}
+
+		@Override
+		public OpenSaml5SerializationConfigurer prettyPrint(boolean pretty) {
+			this.pretty = pretty;
+			return this;
+		}
+
+		@Override
+		public String serialize() {
+			if (this.pretty) {
+				return SerializeSupport.prettyPrintXML(this.element);
+			}
+			return SerializeSupport.nodeToString(this.element);
+		}
+
+	}
+
+	static final class OpenSaml5SignatureConfigurer implements SignatureConfigurer<OpenSaml5SignatureConfigurer> {
+
+		private final Collection<Saml2X509Credential> credentials;
+
+		private final Map<String, String> components = new LinkedHashMap<>();
+
+		private List<String> algs = List.of(SignatureConstants.ALGO_ID_SIGNATURE_RSA_SHA256);
+
+		OpenSaml5SignatureConfigurer(Collection<Saml2X509Credential> credentials) {
+			this.credentials = credentials;
+		}
+
+		@Override
+		public OpenSaml5SignatureConfigurer algorithms(List<String> algs) {
+			this.algs = algs;
+			return this;
+		}
+
+		@Override
+		public <O extends SignableXMLObject> O sign(O object) {
+			SignatureSigningParameters parameters = resolveSigningParameters();
+			try {
+				SignatureSupport.signObject(object, parameters);
+			}
+			catch (Exception ex) {
+				throw new Saml2Exception(ex);
+			}
+			return object;
+		}
+
+		@Override
+		public Map<String, String> sign(Map<String, String> params) {
+			SignatureSigningParameters parameters = resolveSigningParameters();
+			this.components.putAll(params);
+			Credential credential = parameters.getSigningCredential();
+			String algorithmUri = parameters.getSignatureAlgorithm();
+			this.components.put(Saml2ParameterNames.SIG_ALG, algorithmUri);
+			UriComponentsBuilder builder = UriComponentsBuilder.newInstance();
+			for (Map.Entry<String, String> component : this.components.entrySet()) {
+				builder.queryParam(component.getKey(),
+						UriUtils.encode(component.getValue(), StandardCharsets.ISO_8859_1));
+			}
+			String queryString = builder.build(true).toString().substring(1);
+			try {
+				byte[] rawSignature = XMLSigningUtil.signWithURI(credential, algorithmUri,
+						queryString.getBytes(StandardCharsets.UTF_8));
+				String b64Signature = Saml2Utils.samlEncode(rawSignature);
+				this.components.put(Saml2ParameterNames.SIGNATURE, b64Signature);
+			}
+			catch (SecurityException ex) {
+				throw new Saml2Exception(ex);
+			}
+			return this.components;
+		}
+
+		private SignatureSigningParameters resolveSigningParameters() {
+			List<Credential> credentials = resolveSigningCredentials();
+			List<String> digests = Collections.singletonList(SignatureConstants.ALGO_ID_DIGEST_SHA256);
+			String canonicalization = SignatureConstants.ALGO_ID_C14N_EXCL_OMIT_COMMENTS;
+			SignatureSigningParametersResolver resolver = new SAMLMetadataSignatureSigningParametersResolver();
+			BasicSignatureSigningConfiguration signingConfiguration = new BasicSignatureSigningConfiguration();
+			signingConfiguration.setSigningCredentials(credentials);
+			signingConfiguration.setSignatureAlgorithms(this.algs);
+			signingConfiguration.setSignatureReferenceDigestMethods(digests);
+			signingConfiguration.setSignatureCanonicalizationAlgorithm(canonicalization);
+			signingConfiguration.setKeyInfoGeneratorManager(buildSignatureKeyInfoGeneratorManager());
+			CriteriaSet criteria = new CriteriaSet(new SignatureSigningConfigurationCriterion(signingConfiguration));
+			try {
+				SignatureSigningParameters parameters = resolver.resolveSingle(criteria);
+				Assert.notNull(parameters, "Failed to resolve any signing credential");
+				return parameters;
+			}
+			catch (Exception ex) {
+				throw new Saml2Exception(ex);
+			}
+		}
+
+		private NamedKeyInfoGeneratorManager buildSignatureKeyInfoGeneratorManager() {
+			final NamedKeyInfoGeneratorManager namedManager = new NamedKeyInfoGeneratorManager();
+
+			namedManager.setUseDefaultManager(true);
+			final KeyInfoGeneratorManager defaultManager = namedManager.getDefaultManager();
+
+			// Generator for X509Credentials
+			final X509KeyInfoGeneratorFactory x509Factory = new X509KeyInfoGeneratorFactory();
+			x509Factory.setEmitEntityCertificate(true);
+			x509Factory.setEmitEntityCertificateChain(true);
+
+			defaultManager.registerFactory(x509Factory);
+
+			return namedManager;
+		}
+
+		private List<Credential> resolveSigningCredentials() {
+			List<Credential> credentials = new ArrayList<>();
+			for (Saml2X509Credential x509Credential : this.credentials) {
+				X509Certificate certificate = x509Credential.getCertificate();
+				PrivateKey privateKey = x509Credential.getPrivateKey();
+				BasicCredential credential = CredentialSupport.getSimpleCredential(certificate, privateKey);
+				credential.setUsageType(UsageType.SIGNING);
+				credentials.add(credential);
+			}
+			return credentials;
+		}
+
+	}
+
+	static final class OpenSaml5VerificationConfigurer implements VerificationConfigurer {
+
+		private final Collection<Saml2X509Credential> credentials;
+
+		private String entityId;
+
+		OpenSaml5VerificationConfigurer(Collection<Saml2X509Credential> credentials) {
+			this.credentials = credentials;
+		}
+
+		@Override
+		public VerificationConfigurer entityId(String entityId) {
+			this.entityId = entityId;
+			return this;
+		}
+
+		private SignatureTrustEngine trustEngine(Collection<Saml2X509Credential> keys) {
+			Set<Credential> credentials = new HashSet<>();
+			for (Saml2X509Credential key : keys) {
+				BasicX509Credential cred = new BasicX509Credential(key.getCertificate());
+				cred.setUsageType(UsageType.SIGNING);
+				cred.setEntityId(this.entityId);
+				credentials.add(cred);
+			}
+			CredentialResolver credentialsResolver = new CollectionCredentialResolver(credentials);
+			return new ExplicitKeySignatureTrustEngine(credentialsResolver,
+					DefaultSecurityConfigurationBootstrap.buildBasicInlineKeyInfoCredentialResolver());
+		}
+
+		private CriteriaSet verificationCriteria(Issuer issuer) {
+			return new CriteriaSet(new EvaluableEntityIDCredentialCriterion(new EntityIdCriterion(issuer.getValue())),
+					new EvaluableProtocolRoleDescriptorCriterion(new ProtocolCriterion(SAMLConstants.SAML20P_NS)),
+					new EvaluableUsageCredentialCriterion(new UsageCriterion(UsageType.SIGNING)));
+		}
+
+		@Override
+		public Collection<Saml2Error> verify(SignableXMLObject signable) {
+			if (signable instanceof StatusResponseType response) {
+				return verifySignature(response.getID(), response.getIssuer(), response.getSignature());
+			}
+			if (signable instanceof RequestAbstractType request) {
+				return verifySignature(request.getID(), request.getIssuer(), request.getSignature());
+			}
+			if (signable instanceof Assertion assertion) {
+				return verifySignature(assertion.getID(), assertion.getIssuer(), assertion.getSignature());
+			}
+			throw new Saml2Exception("Unsupported object of type: " + signable.getClass().getName());
+		}
+
+		private Collection<Saml2Error> verifySignature(String id, Issuer issuer, Signature signature) {
+			SignatureTrustEngine trustEngine = trustEngine(this.credentials);
+			CriteriaSet criteria = verificationCriteria(issuer);
+			Collection<Saml2Error> errors = new ArrayList<>();
+			SAMLSignatureProfileValidator profileValidator = new SAMLSignatureProfileValidator();
+			try {
+				profileValidator.validate(signature);
+			}
+			catch (Exception ex) {
+				errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Invalid signature for object [" + id + "]: "));
+			}
+
+			try {
+				if (!trustEngine.validate(signature, criteria)) {
+					errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+							"Invalid signature for object [" + id + "]"));
+				}
+			}
+			catch (Exception ex) {
+				errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Invalid signature for object [" + id + "]: "));
+			}
+
+			return errors;
+		}
+
+		@Override
+		public Collection<Saml2Error> verify(RedirectParameters parameters) {
+			SignatureTrustEngine trustEngine = trustEngine(this.credentials);
+			CriteriaSet criteria = verificationCriteria(parameters.getIssuer());
+			if (parameters.getAlgorithm() == null) {
+				return Collections.singletonList(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Missing signature algorithm for object [" + parameters.getId() + "]"));
+			}
+			if (!parameters.hasSignature()) {
+				return Collections.singletonList(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Missing signature for object [" + parameters.getId() + "]"));
+			}
+			Collection<Saml2Error> errors = new ArrayList<>();
+			String algorithmUri = parameters.getAlgorithm();
+			try {
+				if (!trustEngine.validate(parameters.getSignature(), parameters.getContent(), algorithmUri, criteria,
+						null)) {
+					errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+							"Invalid signature for object [" + parameters.getId() + "]"));
+				}
+			}
+			catch (Exception ex) {
+				errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Invalid signature for object [" + parameters.getId() + "]: "));
+			}
+			return errors;
+		}
+
+	}
+
+	static final class OpenSaml5DecryptionConfigurer implements DecryptionConfigurer {
+
+		private static final EncryptedKeyResolver encryptedKeyResolver = new ChainingEncryptedKeyResolver(
+				Arrays.asList(new InlineEncryptedKeyResolver(), new EncryptedElementTypeEncryptedKeyResolver(),
+						new SimpleRetrievalMethodEncryptedKeyResolver()));
+
+		private final Decrypter decrypter;
+
+		OpenSaml5DecryptionConfigurer(Collection<Saml2X509Credential> decryptionCredentials) {
+			this.decrypter = decrypter(decryptionCredentials);
+		}
+
+		private static Decrypter decrypter(Collection<Saml2X509Credential> decryptionCredentials) {
+			Collection<Credential> credentials = new ArrayList<>();
+			for (Saml2X509Credential key : decryptionCredentials) {
+				Credential cred = CredentialSupport.getSimpleCredential(key.getCertificate(), key.getPrivateKey());
+				credentials.add(cred);
+			}
+			KeyInfoCredentialResolver resolver = new CollectionKeyInfoCredentialResolver(credentials);
+			Decrypter decrypter = new Decrypter(null, resolver, encryptedKeyResolver);
+			decrypter.setRootInNewDocument(true);
+			return decrypter;
+		}
+
+		@Override
+		public void decrypt(XMLObject object) {
+			if (object instanceof Response response) {
+				decryptResponse(response);
+				return;
+			}
+			if (object instanceof Assertion assertion) {
+				decryptAssertion(assertion);
+			}
+			if (object instanceof LogoutRequest request) {
+				decryptLogoutRequest(request);
+			}
+		}
+
+		/*
+		 * The methods that follow are adapted from OpenSAML's {@link DecryptAssertions},
+		 * {@link DecryptNameIDs}, and {@link DecryptAttributes}.
+		 *
+		 * <p>The reason that these OpenSAML classes are not used directly is because they
+		 * reference {@link javax.servlet.http.HttpServletRequest} which is a lower
+		 * Servlet API version than what Spring Security SAML uses.
+		 *
+		 * If OpenSAML 5 updates to {@link jakarta.servlet.http.HttpServletRequest}, then
+		 * this arrangement can be revisited.
+		 */
+
+		private void decryptResponse(Response response) {
+			Collection<Assertion> decrypteds = new ArrayList<>();
+			Collection<EncryptedAssertion> encrypteds = new ArrayList<>();
+
+			int count = 0;
+			int size = response.getEncryptedAssertions().size();
+			for (EncryptedAssertion encrypted : response.getEncryptedAssertions()) {
+				logger.trace(String.format("Decrypting EncryptedAssertion (%d/%d) in Response [%s]", count, size,
+						response.getID()));
+				try {
+					Assertion decrypted = this.decrypter.decrypt(encrypted);
+					if (decrypted != null) {
+						encrypteds.add(encrypted);
+						decrypteds.add(decrypted);
+					}
+					count++;
+				}
+				catch (DecryptionException ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+
+			response.getEncryptedAssertions().removeAll(encrypteds);
+			response.getAssertions().addAll(decrypteds);
+
+			// Re-marshall the response so that any ID attributes within the decrypted
+			// Assertions
+			// will have their ID-ness re-established at the DOM level.
+			if (!decrypteds.isEmpty()) {
+				try {
+					XMLObjectSupport.marshall(response);
+				}
+				catch (final MarshallingException ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+		}
+
+		private void decryptAssertion(Assertion assertion) {
+			for (AttributeStatement statement : assertion.getAttributeStatements()) {
+				decryptAttributes(statement);
+			}
+			decryptSubject(assertion.getSubject());
+			if (assertion.getConditions() != null) {
+				for (Condition c : assertion.getConditions().getConditions()) {
+					if (!(c instanceof DelegationRestrictionType delegation)) {
+						continue;
+					}
+					for (Delegate d : delegation.getDelegates()) {
+						if (d.getEncryptedID() != null) {
+							try {
+								NameID decrypted = (NameID) this.decrypter.decrypt(d.getEncryptedID());
+								if (decrypted != null) {
+									d.setNameID(decrypted);
+									d.setEncryptedID(null);
+								}
+							}
+							catch (DecryptionException ex) {
+								throw new Saml2Exception(ex);
+							}
+						}
+					}
+				}
+			}
+		}
+
+		private void decryptAttributes(AttributeStatement statement) {
+			Collection<Attribute> decrypteds = new ArrayList<>();
+			Collection<EncryptedAttribute> encrypteds = new ArrayList<>();
+			for (EncryptedAttribute encrypted : statement.getEncryptedAttributes()) {
+				try {
+					Attribute decrypted = this.decrypter.decrypt(encrypted);
+					if (decrypted != null) {
+						encrypteds.add(encrypted);
+						decrypteds.add(decrypted);
+					}
+				}
+				catch (Exception ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+			statement.getEncryptedAttributes().removeAll(encrypteds);
+			statement.getAttributes().addAll(decrypteds);
+		}
+
+		private void decryptSubject(Subject subject) {
+			if (subject != null) {
+				if (subject.getEncryptedID() != null) {
+					try {
+						NameID decrypted = (NameID) this.decrypter.decrypt(subject.getEncryptedID());
+						if (decrypted != null) {
+							subject.setNameID(decrypted);
+							subject.setEncryptedID(null);
+						}
+					}
+					catch (final DecryptionException ex) {
+						throw new Saml2Exception(ex);
+					}
+				}
+
+				for (final SubjectConfirmation sc : subject.getSubjectConfirmations()) {
+					if (sc.getEncryptedID() != null) {
+						try {
+							NameID decrypted = (NameID) this.decrypter.decrypt(sc.getEncryptedID());
+							if (decrypted != null) {
+								sc.setNameID(decrypted);
+								sc.setEncryptedID(null);
+							}
+						}
+						catch (final DecryptionException ex) {
+							throw new Saml2Exception(ex);
+						}
+					}
+				}
+			}
+		}
+
+		private void decryptLogoutRequest(LogoutRequest request) {
+			if (request.getEncryptedID() != null) {
+				try {
+					NameID decrypted = (NameID) this.decrypter.decrypt(request.getEncryptedID());
+					if (decrypted != null) {
+						request.setNameID(decrypted);
+						request.setEncryptedID(null);
+					}
+				}
+				catch (DecryptionException ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+		}
+
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Main/java/org/springframework/security/saml2/provider/service/authentication/logout/OpenSaml5LogoutRequestValidator.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.authentication.logout;
+
+/**
+ * An OpenSAML 4.x compatible implementation of {@link Saml2LogoutResponseValidator}
+ *
+ * @author Josh Cummings
+ * @since 5.6
+ */
+public final class OpenSaml5LogoutRequestValidator implements Saml2LogoutRequestValidator {
+
+	@SuppressWarnings("deprecation")
+	private final Saml2LogoutRequestValidator delegate = new BaseOpenSamlLogoutRequestValidator(
+			new OpenSaml5Template());
+
+	@Override
+	public Saml2LogoutValidatorResult validate(Saml2LogoutRequestValidatorParameters parameters) {
+		return this.delegate.validate(parameters);
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Main/java/org/springframework/security/saml2/provider/service/authentication/logout/OpenSaml5LogoutResponseValidator.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.authentication.logout;
+
+/**
+ * An OpenSAML 5.x compatible implementation of {@link Saml2LogoutResponseValidator}
+ *
+ * @author Josh Cummings
+ * @since 5.6
+ */
+public final class OpenSaml5LogoutResponseValidator implements Saml2LogoutResponseValidator {
+
+	@SuppressWarnings("deprecation")
+	private final Saml2LogoutResponseValidator delegate = new BaseOpenSamlLogoutResponseValidator(
+			new OpenSaml5Template());
+
+	@Override
+	public Saml2LogoutValidatorResult validate(Saml2LogoutResponseValidatorParameters parameters) {
+		return this.delegate.validate(parameters);
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Main/java/org/springframework/security/saml2/provider/service/authentication/logout/OpenSaml5Template.java

@@ -0,0 +1,617 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.authentication.logout;
+
+import java.io.ByteArrayInputStream;
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
+import java.security.PrivateKey;
+import java.security.cert.X509Certificate;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import javax.xml.namespace.QName;
+
+import net.shibboleth.shared.resolver.CriteriaSet;
+import net.shibboleth.shared.xml.SerializeSupport;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.opensaml.core.criterion.EntityIdCriterion;
+import org.opensaml.core.xml.XMLObject;
+import org.opensaml.core.xml.XMLObjectBuilder;
+import org.opensaml.core.xml.config.XMLObjectProviderRegistrySupport;
+import org.opensaml.core.xml.io.Marshaller;
+import org.opensaml.core.xml.io.MarshallingException;
+import org.opensaml.core.xml.io.Unmarshaller;
+import org.opensaml.core.xml.io.UnmarshallerFactory;
+import org.opensaml.core.xml.util.XMLObjectSupport;
+import org.opensaml.saml.common.xml.SAMLConstants;
+import org.opensaml.saml.criterion.ProtocolCriterion;
+import org.opensaml.saml.ext.saml2delrestrict.Delegate;
+import org.opensaml.saml.ext.saml2delrestrict.DelegationRestrictionType;
+import org.opensaml.saml.metadata.criteria.role.impl.EvaluableProtocolRoleDescriptorCriterion;
+import org.opensaml.saml.saml2.core.Assertion;
+import org.opensaml.saml.saml2.core.Attribute;
+import org.opensaml.saml.saml2.core.AttributeStatement;
+import org.opensaml.saml.saml2.core.Condition;
+import org.opensaml.saml.saml2.core.EncryptedAssertion;
+import org.opensaml.saml.saml2.core.EncryptedAttribute;
+import org.opensaml.saml.saml2.core.Issuer;
+import org.opensaml.saml.saml2.core.LogoutRequest;
+import org.opensaml.saml.saml2.core.NameID;
+import org.opensaml.saml.saml2.core.RequestAbstractType;
+import org.opensaml.saml.saml2.core.Response;
+import org.opensaml.saml.saml2.core.StatusResponseType;
+import org.opensaml.saml.saml2.core.Subject;
+import org.opensaml.saml.saml2.core.SubjectConfirmation;
+import org.opensaml.saml.saml2.encryption.Decrypter;
+import org.opensaml.saml.saml2.encryption.EncryptedElementTypeEncryptedKeyResolver;
+import org.opensaml.saml.security.impl.SAMLMetadataSignatureSigningParametersResolver;
+import org.opensaml.saml.security.impl.SAMLSignatureProfileValidator;
+import org.opensaml.security.SecurityException;
+import org.opensaml.security.credential.BasicCredential;
+import org.opensaml.security.credential.Credential;
+import org.opensaml.security.credential.CredentialResolver;
+import org.opensaml.security.credential.CredentialSupport;
+import org.opensaml.security.credential.UsageType;
+import org.opensaml.security.credential.criteria.impl.EvaluableEntityIDCredentialCriterion;
+import org.opensaml.security.credential.criteria.impl.EvaluableUsageCredentialCriterion;
+import org.opensaml.security.credential.impl.CollectionCredentialResolver;
+import org.opensaml.security.criteria.UsageCriterion;
+import org.opensaml.security.x509.BasicX509Credential;
+import org.opensaml.xmlsec.SignatureSigningParameters;
+import org.opensaml.xmlsec.SignatureSigningParametersResolver;
+import org.opensaml.xmlsec.config.impl.DefaultSecurityConfigurationBootstrap;
+import org.opensaml.xmlsec.criterion.SignatureSigningConfigurationCriterion;
+import org.opensaml.xmlsec.crypto.XMLSigningUtil;
+import org.opensaml.xmlsec.encryption.support.ChainingEncryptedKeyResolver;
+import org.opensaml.xmlsec.encryption.support.DecryptionException;
+import org.opensaml.xmlsec.encryption.support.EncryptedKeyResolver;
+import org.opensaml.xmlsec.encryption.support.InlineEncryptedKeyResolver;
+import org.opensaml.xmlsec.encryption.support.SimpleRetrievalMethodEncryptedKeyResolver;
+import org.opensaml.xmlsec.impl.BasicSignatureSigningConfiguration;
+import org.opensaml.xmlsec.keyinfo.KeyInfoCredentialResolver;
+import org.opensaml.xmlsec.keyinfo.KeyInfoGeneratorManager;
+import org.opensaml.xmlsec.keyinfo.NamedKeyInfoGeneratorManager;
+import org.opensaml.xmlsec.keyinfo.impl.CollectionKeyInfoCredentialResolver;
+import org.opensaml.xmlsec.keyinfo.impl.X509KeyInfoGeneratorFactory;
+import org.opensaml.xmlsec.signature.SignableXMLObject;
+import org.opensaml.xmlsec.signature.Signature;
+import org.opensaml.xmlsec.signature.support.SignatureConstants;
+import org.opensaml.xmlsec.signature.support.SignatureSupport;
+import org.opensaml.xmlsec.signature.support.SignatureTrustEngine;
+import org.opensaml.xmlsec.signature.support.impl.ExplicitKeySignatureTrustEngine;
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+
+import org.springframework.security.saml2.Saml2Exception;
+import org.springframework.security.saml2.core.Saml2Error;
+import org.springframework.security.saml2.core.Saml2ErrorCodes;
+import org.springframework.security.saml2.core.Saml2ParameterNames;
+import org.springframework.security.saml2.core.Saml2X509Credential;
+import org.springframework.util.Assert;
+import org.springframework.web.util.UriComponentsBuilder;
+import org.springframework.web.util.UriUtils;
+
+/**
+ * For internal use only. Subject to breaking changes at any time.
+ */
+final class OpenSaml5Template implements OpenSamlOperations {
+
+	private static final Log logger = LogFactory.getLog(OpenSaml5Template.class);
+
+	@Override
+	public <T extends XMLObject> T build(QName elementName) {
+		XMLObjectBuilder<?> builder = XMLObjectProviderRegistrySupport.getBuilderFactory().getBuilder(elementName);
+		if (builder == null) {
+			throw new Saml2Exception("Unable to resolve Builder for " + elementName);
+		}
+		return (T) builder.buildObject(elementName);
+	}
+
+	@Override
+	public <T extends XMLObject> T deserialize(String serialized) {
+		return deserialize(new ByteArrayInputStream(serialized.getBytes(StandardCharsets.UTF_8)));
+	}
+
+	@Override
+	public <T extends XMLObject> T deserialize(InputStream serialized) {
+		try {
+			Document document = XMLObjectProviderRegistrySupport.getParserPool().parse(serialized);
+			Element element = document.getDocumentElement();
+			UnmarshallerFactory factory = XMLObjectProviderRegistrySupport.getUnmarshallerFactory();
+			Unmarshaller unmarshaller = factory.getUnmarshaller(element);
+			if (unmarshaller == null) {
+				throw new Saml2Exception("Unsupported element of type " + element.getTagName());
+			}
+			return (T) unmarshaller.unmarshall(element);
+		}
+		catch (Saml2Exception ex) {
+			throw ex;
+		}
+		catch (Exception ex) {
+			throw new Saml2Exception("Failed to deserialize payload", ex);
+		}
+	}
+
+	@Override
+	public OpenSaml5SerializationConfigurer serialize(XMLObject object) {
+		Marshaller marshaller = XMLObjectProviderRegistrySupport.getMarshallerFactory().getMarshaller(object);
+		try {
+			return serialize(marshaller.marshall(object));
+		}
+		catch (MarshallingException ex) {
+			throw new Saml2Exception(ex);
+		}
+	}
+
+	@Override
+	public OpenSaml5SerializationConfigurer serialize(Element element) {
+		return new OpenSaml5SerializationConfigurer(element);
+	}
+
+	@Override
+	public OpenSaml5SignatureConfigurer withSigningKeys(Collection<Saml2X509Credential> credentials) {
+		return new OpenSaml5SignatureConfigurer(credentials);
+	}
+
+	@Override
+	public OpenSaml5VerificationConfigurer withVerificationKeys(Collection<Saml2X509Credential> credentials) {
+		return new OpenSaml5VerificationConfigurer(credentials);
+	}
+
+	@Override
+	public OpenSaml5DecryptionConfigurer withDecryptionKeys(Collection<Saml2X509Credential> credentials) {
+		return new OpenSaml5DecryptionConfigurer(credentials);
+	}
+
+	OpenSaml5Template() {
+
+	}
+
+	static final class OpenSaml5SerializationConfigurer
+			implements SerializationConfigurer<OpenSaml5SerializationConfigurer> {
+
+		private final Element element;
+
+		boolean pretty;
+
+		OpenSaml5SerializationConfigurer(Element element) {
+			this.element = element;
+		}
+
+		@Override
+		public OpenSaml5SerializationConfigurer prettyPrint(boolean pretty) {
+			this.pretty = pretty;
+			return this;
+		}
+
+		@Override
+		public String serialize() {
+			if (this.pretty) {
+				return SerializeSupport.prettyPrintXML(this.element);
+			}
+			return SerializeSupport.nodeToString(this.element);
+		}
+
+	}
+
+	static final class OpenSaml5SignatureConfigurer implements SignatureConfigurer<OpenSaml5SignatureConfigurer> {
+
+		private final Collection<Saml2X509Credential> credentials;
+
+		private final Map<String, String> components = new LinkedHashMap<>();
+
+		private List<String> algs = List.of(SignatureConstants.ALGO_ID_SIGNATURE_RSA_SHA256);
+
+		OpenSaml5SignatureConfigurer(Collection<Saml2X509Credential> credentials) {
+			this.credentials = credentials;
+		}
+
+		@Override
+		public OpenSaml5SignatureConfigurer algorithms(List<String> algs) {
+			this.algs = algs;
+			return this;
+		}
+
+		@Override
+		public <O extends SignableXMLObject> O sign(O object) {
+			SignatureSigningParameters parameters = resolveSigningParameters();
+			try {
+				SignatureSupport.signObject(object, parameters);
+			}
+			catch (Exception ex) {
+				throw new Saml2Exception(ex);
+			}
+			return object;
+		}
+
+		@Override
+		public Map<String, String> sign(Map<String, String> params) {
+			SignatureSigningParameters parameters = resolveSigningParameters();
+			this.components.putAll(params);
+			Credential credential = parameters.getSigningCredential();
+			String algorithmUri = parameters.getSignatureAlgorithm();
+			this.components.put(Saml2ParameterNames.SIG_ALG, algorithmUri);
+			UriComponentsBuilder builder = UriComponentsBuilder.newInstance();
+			for (Map.Entry<String, String> component : this.components.entrySet()) {
+				builder.queryParam(component.getKey(),
+						UriUtils.encode(component.getValue(), StandardCharsets.ISO_8859_1));
+			}
+			String queryString = builder.build(true).toString().substring(1);
+			try {
+				byte[] rawSignature = XMLSigningUtil.signWithURI(credential, algorithmUri,
+						queryString.getBytes(StandardCharsets.UTF_8));
+				String b64Signature = Saml2Utils.samlEncode(rawSignature);
+				this.components.put(Saml2ParameterNames.SIGNATURE, b64Signature);
+			}
+			catch (SecurityException ex) {
+				throw new Saml2Exception(ex);
+			}
+			return this.components;
+		}
+
+		private SignatureSigningParameters resolveSigningParameters() {
+			List<Credential> credentials = resolveSigningCredentials();
+			List<String> digests = Collections.singletonList(SignatureConstants.ALGO_ID_DIGEST_SHA256);
+			String canonicalization = SignatureConstants.ALGO_ID_C14N_EXCL_OMIT_COMMENTS;
+			SignatureSigningParametersResolver resolver = new SAMLMetadataSignatureSigningParametersResolver();
+			BasicSignatureSigningConfiguration signingConfiguration = new BasicSignatureSigningConfiguration();
+			signingConfiguration.setSigningCredentials(credentials);
+			signingConfiguration.setSignatureAlgorithms(this.algs);
+			signingConfiguration.setSignatureReferenceDigestMethods(digests);
+			signingConfiguration.setSignatureCanonicalizationAlgorithm(canonicalization);
+			signingConfiguration.setKeyInfoGeneratorManager(buildSignatureKeyInfoGeneratorManager());
+			CriteriaSet criteria = new CriteriaSet(new SignatureSigningConfigurationCriterion(signingConfiguration));
+			try {
+				SignatureSigningParameters parameters = resolver.resolveSingle(criteria);
+				Assert.notNull(parameters, "Failed to resolve any signing credential");
+				return parameters;
+			}
+			catch (Exception ex) {
+				throw new Saml2Exception(ex);
+			}
+		}
+
+		private NamedKeyInfoGeneratorManager buildSignatureKeyInfoGeneratorManager() {
+			final NamedKeyInfoGeneratorManager namedManager = new NamedKeyInfoGeneratorManager();
+
+			namedManager.setUseDefaultManager(true);
+			final KeyInfoGeneratorManager defaultManager = namedManager.getDefaultManager();
+
+			// Generator for X509Credentials
+			final X509KeyInfoGeneratorFactory x509Factory = new X509KeyInfoGeneratorFactory();
+			x509Factory.setEmitEntityCertificate(true);
+			x509Factory.setEmitEntityCertificateChain(true);
+
+			defaultManager.registerFactory(x509Factory);
+
+			return namedManager;
+		}
+
+		private List<Credential> resolveSigningCredentials() {
+			List<Credential> credentials = new ArrayList<>();
+			for (Saml2X509Credential x509Credential : this.credentials) {
+				X509Certificate certificate = x509Credential.getCertificate();
+				PrivateKey privateKey = x509Credential.getPrivateKey();
+				BasicCredential credential = CredentialSupport.getSimpleCredential(certificate, privateKey);
+				credential.setUsageType(UsageType.SIGNING);
+				credentials.add(credential);
+			}
+			return credentials;
+		}
+
+	}
+
+	static final class OpenSaml5VerificationConfigurer implements VerificationConfigurer {
+
+		private final Collection<Saml2X509Credential> credentials;
+
+		private String entityId;
+
+		OpenSaml5VerificationConfigurer(Collection<Saml2X509Credential> credentials) {
+			this.credentials = credentials;
+		}
+
+		@Override
+		public VerificationConfigurer entityId(String entityId) {
+			this.entityId = entityId;
+			return this;
+		}
+
+		private SignatureTrustEngine trustEngine(Collection<Saml2X509Credential> keys) {
+			Set<Credential> credentials = new HashSet<>();
+			for (Saml2X509Credential key : keys) {
+				BasicX509Credential cred = new BasicX509Credential(key.getCertificate());
+				cred.setUsageType(UsageType.SIGNING);
+				cred.setEntityId(this.entityId);
+				credentials.add(cred);
+			}
+			CredentialResolver credentialsResolver = new CollectionCredentialResolver(credentials);
+			return new ExplicitKeySignatureTrustEngine(credentialsResolver,
+					DefaultSecurityConfigurationBootstrap.buildBasicInlineKeyInfoCredentialResolver());
+		}
+
+		private CriteriaSet verificationCriteria(Issuer issuer) {
+			return new CriteriaSet(new EvaluableEntityIDCredentialCriterion(new EntityIdCriterion(issuer.getValue())),
+					new EvaluableProtocolRoleDescriptorCriterion(new ProtocolCriterion(SAMLConstants.SAML20P_NS)),
+					new EvaluableUsageCredentialCriterion(new UsageCriterion(UsageType.SIGNING)));
+		}
+
+		@Override
+		public Collection<Saml2Error> verify(SignableXMLObject signable) {
+			if (signable instanceof StatusResponseType response) {
+				return verifySignature(response.getID(), response.getIssuer(), response.getSignature());
+			}
+			if (signable instanceof RequestAbstractType request) {
+				return verifySignature(request.getID(), request.getIssuer(), request.getSignature());
+			}
+			if (signable instanceof Assertion assertion) {
+				return verifySignature(assertion.getID(), assertion.getIssuer(), assertion.getSignature());
+			}
+			throw new Saml2Exception("Unsupported object of type: " + signable.getClass().getName());
+		}
+
+		private Collection<Saml2Error> verifySignature(String id, Issuer issuer, Signature signature) {
+			SignatureTrustEngine trustEngine = trustEngine(this.credentials);
+			CriteriaSet criteria = verificationCriteria(issuer);
+			Collection<Saml2Error> errors = new ArrayList<>();
+			SAMLSignatureProfileValidator profileValidator = new SAMLSignatureProfileValidator();
+			try {
+				profileValidator.validate(signature);
+			}
+			catch (Exception ex) {
+				errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Invalid signature for object [" + id + "]: "));
+			}
+
+			try {
+				if (!trustEngine.validate(signature, criteria)) {
+					errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+							"Invalid signature for object [" + id + "]"));
+				}
+			}
+			catch (Exception ex) {
+				errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Invalid signature for object [" + id + "]: "));
+			}
+
+			return errors;
+		}
+
+		@Override
+		public Collection<Saml2Error> verify(RedirectParameters parameters) {
+			SignatureTrustEngine trustEngine = trustEngine(this.credentials);
+			CriteriaSet criteria = verificationCriteria(parameters.getIssuer());
+			if (parameters.getAlgorithm() == null) {
+				return Collections.singletonList(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Missing signature algorithm for object [" + parameters.getId() + "]"));
+			}
+			if (!parameters.hasSignature()) {
+				return Collections.singletonList(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Missing signature for object [" + parameters.getId() + "]"));
+			}
+			Collection<Saml2Error> errors = new ArrayList<>();
+			String algorithmUri = parameters.getAlgorithm();
+			try {
+				if (!trustEngine.validate(parameters.getSignature(), parameters.getContent(), algorithmUri, criteria,
+						null)) {
+					errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+							"Invalid signature for object [" + parameters.getId() + "]"));
+				}
+			}
+			catch (Exception ex) {
+				errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Invalid signature for object [" + parameters.getId() + "]: "));
+			}
+			return errors;
+		}
+
+	}
+
+	static final class OpenSaml5DecryptionConfigurer implements DecryptionConfigurer {
+
+		private static final EncryptedKeyResolver encryptedKeyResolver = new ChainingEncryptedKeyResolver(
+				Arrays.asList(new InlineEncryptedKeyResolver(), new EncryptedElementTypeEncryptedKeyResolver(),
+						new SimpleRetrievalMethodEncryptedKeyResolver()));
+
+		private final Decrypter decrypter;
+
+		OpenSaml5DecryptionConfigurer(Collection<Saml2X509Credential> decryptionCredentials) {
+			this.decrypter = decrypter(decryptionCredentials);
+		}
+
+		private static Decrypter decrypter(Collection<Saml2X509Credential> decryptionCredentials) {
+			Collection<Credential> credentials = new ArrayList<>();
+			for (Saml2X509Credential key : decryptionCredentials) {
+				Credential cred = CredentialSupport.getSimpleCredential(key.getCertificate(), key.getPrivateKey());
+				credentials.add(cred);
+			}
+			KeyInfoCredentialResolver resolver = new CollectionKeyInfoCredentialResolver(credentials);
+			Decrypter decrypter = new Decrypter(null, resolver, encryptedKeyResolver);
+			decrypter.setRootInNewDocument(true);
+			return decrypter;
+		}
+
+		@Override
+		public void decrypt(XMLObject object) {
+			if (object instanceof Response response) {
+				decryptResponse(response);
+				return;
+			}
+			if (object instanceof Assertion assertion) {
+				decryptAssertion(assertion);
+			}
+			if (object instanceof LogoutRequest request) {
+				decryptLogoutRequest(request);
+			}
+		}
+
+		/*
+		 * The methods that follow are adapted from OpenSAML's {@link DecryptAssertions},
+		 * {@link DecryptNameIDs}, and {@link DecryptAttributes}.
+		 *
+		 * <p>The reason that these OpenSAML classes are not used directly is because they
+		 * reference {@link javax.servlet.http.HttpServletRequest} which is a lower
+		 * Servlet API version than what Spring Security SAML uses.
+		 *
+		 * If OpenSAML 5 updates to {@link jakarta.servlet.http.HttpServletRequest}, then
+		 * this arrangement can be revisited.
+		 */
+
+		private void decryptResponse(Response response) {
+			Collection<Assertion> decrypteds = new ArrayList<>();
+			Collection<EncryptedAssertion> encrypteds = new ArrayList<>();
+
+			int count = 0;
+			int size = response.getEncryptedAssertions().size();
+			for (EncryptedAssertion encrypted : response.getEncryptedAssertions()) {
+				logger.trace(String.format("Decrypting EncryptedAssertion (%d/%d) in Response [%s]", count, size,
+						response.getID()));
+				try {
+					Assertion decrypted = this.decrypter.decrypt(encrypted);
+					if (decrypted != null) {
+						encrypteds.add(encrypted);
+						decrypteds.add(decrypted);
+					}
+					count++;
+				}
+				catch (DecryptionException ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+
+			response.getEncryptedAssertions().removeAll(encrypteds);
+			response.getAssertions().addAll(decrypteds);
+
+			// Re-marshall the response so that any ID attributes within the decrypted
+			// Assertions
+			// will have their ID-ness re-established at the DOM level.
+			if (!decrypteds.isEmpty()) {
+				try {
+					XMLObjectSupport.marshall(response);
+				}
+				catch (final MarshallingException ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+		}
+
+		private void decryptAssertion(Assertion assertion) {
+			for (AttributeStatement statement : assertion.getAttributeStatements()) {
+				decryptAttributes(statement);
+			}
+			decryptSubject(assertion.getSubject());
+			if (assertion.getConditions() != null) {
+				for (Condition c : assertion.getConditions().getConditions()) {
+					if (!(c instanceof DelegationRestrictionType delegation)) {
+						continue;
+					}
+					for (Delegate d : delegation.getDelegates()) {
+						if (d.getEncryptedID() != null) {
+							try {
+								NameID decrypted = (NameID) this.decrypter.decrypt(d.getEncryptedID());
+								if (decrypted != null) {
+									d.setNameID(decrypted);
+									d.setEncryptedID(null);
+								}
+							}
+							catch (DecryptionException ex) {
+								throw new Saml2Exception(ex);
+							}
+						}
+					}
+				}
+			}
+		}
+
+		private void decryptAttributes(AttributeStatement statement) {
+			Collection<Attribute> decrypteds = new ArrayList<>();
+			Collection<EncryptedAttribute> encrypteds = new ArrayList<>();
+			for (EncryptedAttribute encrypted : statement.getEncryptedAttributes()) {
+				try {
+					Attribute decrypted = this.decrypter.decrypt(encrypted);
+					if (decrypted != null) {
+						encrypteds.add(encrypted);
+						decrypteds.add(decrypted);
+					}
+				}
+				catch (Exception ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+			statement.getEncryptedAttributes().removeAll(encrypteds);
+			statement.getAttributes().addAll(decrypteds);
+		}
+
+		private void decryptSubject(Subject subject) {
+			if (subject != null) {
+				if (subject.getEncryptedID() != null) {
+					try {
+						NameID decrypted = (NameID) this.decrypter.decrypt(subject.getEncryptedID());
+						if (decrypted != null) {
+							subject.setNameID(decrypted);
+							subject.setEncryptedID(null);
+						}
+					}
+					catch (final DecryptionException ex) {
+						throw new Saml2Exception(ex);
+					}
+				}
+
+				for (final SubjectConfirmation sc : subject.getSubjectConfirmations()) {
+					if (sc.getEncryptedID() != null) {
+						try {
+							NameID decrypted = (NameID) this.decrypter.decrypt(sc.getEncryptedID());
+							if (decrypted != null) {
+								sc.setNameID(decrypted);
+								sc.setEncryptedID(null);
+							}
+						}
+						catch (final DecryptionException ex) {
+							throw new Saml2Exception(ex);
+						}
+					}
+				}
+			}
+		}
+
+		private void decryptLogoutRequest(LogoutRequest request) {
+			if (request.getEncryptedID() != null) {
+				try {
+					NameID decrypted = (NameID) this.decrypter.decrypt(request.getEncryptedID());
+					if (decrypted != null) {
+						request.setNameID(decrypted);
+						request.setEncryptedID(null);
+					}
+				}
+				catch (DecryptionException ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+		}
+
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Main/java/org/springframework/security/saml2/provider/service/authentication/logout/Saml2Utils.java

@@ -0,0 +1,196 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.authentication.logout;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.util.Arrays;
+import java.util.Base64;
+import java.util.zip.Deflater;
+import java.util.zip.DeflaterOutputStream;
+import java.util.zip.Inflater;
+import java.util.zip.InflaterOutputStream;
+
+import org.springframework.security.saml2.Saml2Exception;
+
+/**
+ * Utility methods for working with serialized SAML messages.
+ *
+ * For internal use only.
+ *
+ * @author Josh Cummings
+ */
+final class Saml2Utils {
+
+	private Saml2Utils() {
+	}
+
+	static String samlEncode(byte[] b) {
+		return Base64.getEncoder().encodeToString(b);
+	}
+
+	static byte[] samlDecode(String s) {
+		return Base64.getMimeDecoder().decode(s);
+	}
+
+	static byte[] samlDeflate(String s) {
+		try {
+			ByteArrayOutputStream b = new ByteArrayOutputStream();
+			DeflaterOutputStream deflater = new DeflaterOutputStream(b, new Deflater(Deflater.DEFLATED, true));
+			deflater.write(s.getBytes(StandardCharsets.UTF_8));
+			deflater.finish();
+			return b.toByteArray();
+		}
+		catch (IOException ex) {
+			throw new Saml2Exception("Unable to deflate string", ex);
+		}
+	}
+
+	static String samlInflate(byte[] b) {
+		try {
+			ByteArrayOutputStream out = new ByteArrayOutputStream();
+			InflaterOutputStream iout = new InflaterOutputStream(out, new Inflater(true));
+			iout.write(b);
+			iout.finish();
+			return new String(out.toByteArray(), StandardCharsets.UTF_8);
+		}
+		catch (IOException ex) {
+			throw new Saml2Exception("Unable to inflate string", ex);
+		}
+	}
+
+	static EncodingConfigurer withDecoded(String decoded) {
+		return new EncodingConfigurer(decoded);
+	}
+
+	static DecodingConfigurer withEncoded(String encoded) {
+		return new DecodingConfigurer(encoded);
+	}
+
+	static final class EncodingConfigurer {
+
+		private final String decoded;
+
+		private boolean deflate;
+
+		private EncodingConfigurer(String decoded) {
+			this.decoded = decoded;
+		}
+
+		EncodingConfigurer deflate(boolean deflate) {
+			this.deflate = deflate;
+			return this;
+		}
+
+		String encode() {
+			byte[] bytes = (this.deflate) ? Saml2Utils.samlDeflate(this.decoded)
+					: this.decoded.getBytes(StandardCharsets.UTF_8);
+			return Saml2Utils.samlEncode(bytes);
+		}
+
+	}
+
+	static final class DecodingConfigurer {
+
+		private static final Base64Checker BASE_64_CHECKER = new Base64Checker();
+
+		private final String encoded;
+
+		private boolean inflate;
+
+		private boolean requireBase64;
+
+		private DecodingConfigurer(String encoded) {
+			this.encoded = encoded;
+		}
+
+		DecodingConfigurer inflate(boolean inflate) {
+			this.inflate = inflate;
+			return this;
+		}
+
+		DecodingConfigurer requireBase64(boolean requireBase64) {
+			this.requireBase64 = requireBase64;
+			return this;
+		}
+
+		String decode() {
+			if (this.requireBase64) {
+				BASE_64_CHECKER.checkAcceptable(this.encoded);
+			}
+			byte[] bytes = Saml2Utils.samlDecode(this.encoded);
+			return (this.inflate) ? Saml2Utils.samlInflate(bytes) : new String(bytes, StandardCharsets.UTF_8);
+		}
+
+		static class Base64Checker {
+
+			private static final int[] values = genValueMapping();
+
+			Base64Checker() {
+
+			}
+
+			private static int[] genValueMapping() {
+				byte[] alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
+					.getBytes(StandardCharsets.ISO_8859_1);
+
+				int[] values = new int[256];
+				Arrays.fill(values, -1);
+				for (int i = 0; i < alphabet.length; i++) {
+					values[alphabet[i] & 0xff] = i;
+				}
+				return values;
+			}
+
+			boolean isAcceptable(String s) {
+				int goodChars = 0;
+				int lastGoodCharVal = -1;
+
+				// count number of characters from Base64 alphabet
+				for (int i = 0; i < s.length(); i++) {
+					int val = values[0xff & s.charAt(i)];
+					if (val != -1) {
+						lastGoodCharVal = val;
+						goodChars++;
+					}
+				}
+
+				// in cases of an incomplete final chunk, ensure the unused bits are zero
+				switch (goodChars % 4) {
+					case 0:
+						return true;
+					case 2:
+						return (lastGoodCharVal & 0b1111) == 0;
+					case 3:
+						return (lastGoodCharVal & 0b11) == 0;
+					default:
+						return false;
+				}
+			}
+
+			void checkAcceptable(String ins) {
+				if (!isAcceptable(ins)) {
+					throw new IllegalArgumentException("Failed to decode SAMLResponse");
+				}
+			}
+
+		}
+
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Main/java/org/springframework/security/saml2/provider/service/metadata/OpenSaml5MetadataResolver.java

@@ -0,0 +1,117 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.metadata;
+
+import java.util.function.Consumer;
+
+import org.opensaml.saml.saml2.metadata.EntityDescriptor;
+
+import org.springframework.security.saml2.core.OpenSamlInitializationService;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistration;
+
+/**
+ * Resolves the SAML 2.0 Relying Party Metadata for a given
+ * {@link RelyingPartyRegistration} using the OpenSAML API.
+ *
+ * @author Jakub Kubrynski
+ * @author Josh Cummings
+ * @since 5.4
+ */
+public final class OpenSaml5MetadataResolver implements Saml2MetadataResolver {
+
+	static {
+		OpenSamlInitializationService.initialize();
+	}
+
+	private final BaseOpenSamlMetadataResolver delegate;
+
+	public OpenSaml5MetadataResolver() {
+		this.delegate = new BaseOpenSamlMetadataResolver(new OpenSaml5Template());
+	}
+
+	@Override
+	public String resolve(RelyingPartyRegistration relyingPartyRegistration) {
+		return this.delegate.resolve(relyingPartyRegistration);
+	}
+
+	public String resolve(Iterable<RelyingPartyRegistration> relyingPartyRegistrations) {
+		return this.delegate.resolve(relyingPartyRegistrations);
+	}
+
+	/**
+	 * Set a {@link Consumer} for modifying the OpenSAML {@link EntityDescriptor}
+	 * @param entityDescriptorCustomizer a consumer that accepts an
+	 * {@link EntityDescriptorParameters}
+	 * @since 5.7
+	 */
+	public void setEntityDescriptorCustomizer(Consumer<EntityDescriptorParameters> entityDescriptorCustomizer) {
+		this.delegate.setEntityDescriptorCustomizer(
+				(parameters) -> entityDescriptorCustomizer.accept(new EntityDescriptorParameters(parameters)));
+	}
+
+	/**
+	 * Configure whether to pretty-print the metadata XML. This can be helpful when
+	 * signing the metadata payload.
+	 *
+	 * @since 6.2
+	 **/
+	public void setUsePrettyPrint(boolean usePrettyPrint) {
+		this.delegate.setUsePrettyPrint(usePrettyPrint);
+	}
+
+	/**
+	 * Configure whether to sign the metadata, defaults to {@code false}.
+	 *
+	 * @since 6.4
+	 */
+	public void setSignMetadata(boolean signMetadata) {
+		this.delegate.setSignMetadata(signMetadata);
+	}
+
+	/**
+	 * A tuple containing an OpenSAML {@link EntityDescriptor} and its associated
+	 * {@link RelyingPartyRegistration}
+	 *
+	 * @since 5.7
+	 */
+	public static final class EntityDescriptorParameters {
+
+		private final EntityDescriptor entityDescriptor;
+
+		private final RelyingPartyRegistration registration;
+
+		public EntityDescriptorParameters(EntityDescriptor entityDescriptor, RelyingPartyRegistration registration) {
+			this.entityDescriptor = entityDescriptor;
+			this.registration = registration;
+		}
+
+		EntityDescriptorParameters(BaseOpenSamlMetadataResolver.EntityDescriptorParameters parameters) {
+			this.entityDescriptor = parameters.getEntityDescriptor();
+			this.registration = parameters.getRelyingPartyRegistration();
+		}
+
+		public EntityDescriptor getEntityDescriptor() {
+			return this.entityDescriptor;
+		}
+
+		public RelyingPartyRegistration getRelyingPartyRegistration() {
+			return this.registration;
+		}
+
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Main/java/org/springframework/security/saml2/provider/service/metadata/OpenSaml5Template.java

@@ -0,0 +1,617 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.metadata;
+
+import java.io.ByteArrayInputStream;
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
+import java.security.PrivateKey;
+import java.security.cert.X509Certificate;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import javax.xml.namespace.QName;
+
+import net.shibboleth.shared.resolver.CriteriaSet;
+import net.shibboleth.shared.xml.SerializeSupport;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.opensaml.core.criterion.EntityIdCriterion;
+import org.opensaml.core.xml.XMLObject;
+import org.opensaml.core.xml.XMLObjectBuilder;
+import org.opensaml.core.xml.config.XMLObjectProviderRegistrySupport;
+import org.opensaml.core.xml.io.Marshaller;
+import org.opensaml.core.xml.io.MarshallingException;
+import org.opensaml.core.xml.io.Unmarshaller;
+import org.opensaml.core.xml.io.UnmarshallerFactory;
+import org.opensaml.core.xml.util.XMLObjectSupport;
+import org.opensaml.saml.common.xml.SAMLConstants;
+import org.opensaml.saml.criterion.ProtocolCriterion;
+import org.opensaml.saml.ext.saml2delrestrict.Delegate;
+import org.opensaml.saml.ext.saml2delrestrict.DelegationRestrictionType;
+import org.opensaml.saml.metadata.criteria.role.impl.EvaluableProtocolRoleDescriptorCriterion;
+import org.opensaml.saml.saml2.core.Assertion;
+import org.opensaml.saml.saml2.core.Attribute;
+import org.opensaml.saml.saml2.core.AttributeStatement;
+import org.opensaml.saml.saml2.core.Condition;
+import org.opensaml.saml.saml2.core.EncryptedAssertion;
+import org.opensaml.saml.saml2.core.EncryptedAttribute;
+import org.opensaml.saml.saml2.core.Issuer;
+import org.opensaml.saml.saml2.core.LogoutRequest;
+import org.opensaml.saml.saml2.core.NameID;
+import org.opensaml.saml.saml2.core.RequestAbstractType;
+import org.opensaml.saml.saml2.core.Response;
+import org.opensaml.saml.saml2.core.StatusResponseType;
+import org.opensaml.saml.saml2.core.Subject;
+import org.opensaml.saml.saml2.core.SubjectConfirmation;
+import org.opensaml.saml.saml2.encryption.Decrypter;
+import org.opensaml.saml.saml2.encryption.EncryptedElementTypeEncryptedKeyResolver;
+import org.opensaml.saml.security.impl.SAMLMetadataSignatureSigningParametersResolver;
+import org.opensaml.saml.security.impl.SAMLSignatureProfileValidator;
+import org.opensaml.security.SecurityException;
+import org.opensaml.security.credential.BasicCredential;
+import org.opensaml.security.credential.Credential;
+import org.opensaml.security.credential.CredentialResolver;
+import org.opensaml.security.credential.CredentialSupport;
+import org.opensaml.security.credential.UsageType;
+import org.opensaml.security.credential.criteria.impl.EvaluableEntityIDCredentialCriterion;
+import org.opensaml.security.credential.criteria.impl.EvaluableUsageCredentialCriterion;
+import org.opensaml.security.credential.impl.CollectionCredentialResolver;
+import org.opensaml.security.criteria.UsageCriterion;
+import org.opensaml.security.x509.BasicX509Credential;
+import org.opensaml.xmlsec.SignatureSigningParameters;
+import org.opensaml.xmlsec.SignatureSigningParametersResolver;
+import org.opensaml.xmlsec.config.impl.DefaultSecurityConfigurationBootstrap;
+import org.opensaml.xmlsec.criterion.SignatureSigningConfigurationCriterion;
+import org.opensaml.xmlsec.crypto.XMLSigningUtil;
+import org.opensaml.xmlsec.encryption.support.ChainingEncryptedKeyResolver;
+import org.opensaml.xmlsec.encryption.support.DecryptionException;
+import org.opensaml.xmlsec.encryption.support.EncryptedKeyResolver;
+import org.opensaml.xmlsec.encryption.support.InlineEncryptedKeyResolver;
+import org.opensaml.xmlsec.encryption.support.SimpleRetrievalMethodEncryptedKeyResolver;
+import org.opensaml.xmlsec.impl.BasicSignatureSigningConfiguration;
+import org.opensaml.xmlsec.keyinfo.KeyInfoCredentialResolver;
+import org.opensaml.xmlsec.keyinfo.KeyInfoGeneratorManager;
+import org.opensaml.xmlsec.keyinfo.NamedKeyInfoGeneratorManager;
+import org.opensaml.xmlsec.keyinfo.impl.CollectionKeyInfoCredentialResolver;
+import org.opensaml.xmlsec.keyinfo.impl.X509KeyInfoGeneratorFactory;
+import org.opensaml.xmlsec.signature.SignableXMLObject;
+import org.opensaml.xmlsec.signature.Signature;
+import org.opensaml.xmlsec.signature.support.SignatureConstants;
+import org.opensaml.xmlsec.signature.support.SignatureSupport;
+import org.opensaml.xmlsec.signature.support.SignatureTrustEngine;
+import org.opensaml.xmlsec.signature.support.impl.ExplicitKeySignatureTrustEngine;
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+
+import org.springframework.security.saml2.Saml2Exception;
+import org.springframework.security.saml2.core.Saml2Error;
+import org.springframework.security.saml2.core.Saml2ErrorCodes;
+import org.springframework.security.saml2.core.Saml2ParameterNames;
+import org.springframework.security.saml2.core.Saml2X509Credential;
+import org.springframework.util.Assert;
+import org.springframework.web.util.UriComponentsBuilder;
+import org.springframework.web.util.UriUtils;
+
+/**
+ * For internal use only. Subject to breaking changes at any time.
+ */
+final class OpenSaml5Template implements OpenSamlOperations {
+
+	private static final Log logger = LogFactory.getLog(OpenSaml5Template.class);
+
+	@Override
+	public <T extends XMLObject> T build(QName elementName) {
+		XMLObjectBuilder<?> builder = XMLObjectProviderRegistrySupport.getBuilderFactory().getBuilder(elementName);
+		if (builder == null) {
+			throw new Saml2Exception("Unable to resolve Builder for " + elementName);
+		}
+		return (T) builder.buildObject(elementName);
+	}
+
+	@Override
+	public <T extends XMLObject> T deserialize(String serialized) {
+		return deserialize(new ByteArrayInputStream(serialized.getBytes(StandardCharsets.UTF_8)));
+	}
+
+	@Override
+	public <T extends XMLObject> T deserialize(InputStream serialized) {
+		try {
+			Document document = XMLObjectProviderRegistrySupport.getParserPool().parse(serialized);
+			Element element = document.getDocumentElement();
+			UnmarshallerFactory factory = XMLObjectProviderRegistrySupport.getUnmarshallerFactory();
+			Unmarshaller unmarshaller = factory.getUnmarshaller(element);
+			if (unmarshaller == null) {
+				throw new Saml2Exception("Unsupported element of type " + element.getTagName());
+			}
+			return (T) unmarshaller.unmarshall(element);
+		}
+		catch (Saml2Exception ex) {
+			throw ex;
+		}
+		catch (Exception ex) {
+			throw new Saml2Exception("Failed to deserialize payload", ex);
+		}
+	}
+
+	@Override
+	public OpenSaml5SerializationConfigurer serialize(XMLObject object) {
+		Marshaller marshaller = XMLObjectProviderRegistrySupport.getMarshallerFactory().getMarshaller(object);
+		try {
+			return serialize(marshaller.marshall(object));
+		}
+		catch (MarshallingException ex) {
+			throw new Saml2Exception(ex);
+		}
+	}
+
+	@Override
+	public OpenSaml5SerializationConfigurer serialize(Element element) {
+		return new OpenSaml5SerializationConfigurer(element);
+	}
+
+	@Override
+	public OpenSaml5SignatureConfigurer withSigningKeys(Collection<Saml2X509Credential> credentials) {
+		return new OpenSaml5SignatureConfigurer(credentials);
+	}
+
+	@Override
+	public OpenSaml5VerificationConfigurer withVerificationKeys(Collection<Saml2X509Credential> credentials) {
+		return new OpenSaml5VerificationConfigurer(credentials);
+	}
+
+	@Override
+	public OpenSaml5DecryptionConfigurer withDecryptionKeys(Collection<Saml2X509Credential> credentials) {
+		return new OpenSaml5DecryptionConfigurer(credentials);
+	}
+
+	OpenSaml5Template() {
+
+	}
+
+	static final class OpenSaml5SerializationConfigurer
+			implements SerializationConfigurer<OpenSaml5SerializationConfigurer> {
+
+		private final Element element;
+
+		boolean pretty;
+
+		OpenSaml5SerializationConfigurer(Element element) {
+			this.element = element;
+		}
+
+		@Override
+		public OpenSaml5SerializationConfigurer prettyPrint(boolean pretty) {
+			this.pretty = pretty;
+			return this;
+		}
+
+		@Override
+		public String serialize() {
+			if (this.pretty) {
+				return SerializeSupport.prettyPrintXML(this.element);
+			}
+			return SerializeSupport.nodeToString(this.element);
+		}
+
+	}
+
+	static final class OpenSaml5SignatureConfigurer implements SignatureConfigurer<OpenSaml5SignatureConfigurer> {
+
+		private final Collection<Saml2X509Credential> credentials;
+
+		private final Map<String, String> components = new LinkedHashMap<>();
+
+		private List<String> algs = List.of(SignatureConstants.ALGO_ID_SIGNATURE_RSA_SHA256);
+
+		OpenSaml5SignatureConfigurer(Collection<Saml2X509Credential> credentials) {
+			this.credentials = credentials;
+		}
+
+		@Override
+		public OpenSaml5SignatureConfigurer algorithms(List<String> algs) {
+			this.algs = algs;
+			return this;
+		}
+
+		@Override
+		public <O extends SignableXMLObject> O sign(O object) {
+			SignatureSigningParameters parameters = resolveSigningParameters();
+			try {
+				SignatureSupport.signObject(object, parameters);
+			}
+			catch (Exception ex) {
+				throw new Saml2Exception(ex);
+			}
+			return object;
+		}
+
+		@Override
+		public Map<String, String> sign(Map<String, String> params) {
+			SignatureSigningParameters parameters = resolveSigningParameters();
+			this.components.putAll(params);
+			Credential credential = parameters.getSigningCredential();
+			String algorithmUri = parameters.getSignatureAlgorithm();
+			this.components.put(Saml2ParameterNames.SIG_ALG, algorithmUri);
+			UriComponentsBuilder builder = UriComponentsBuilder.newInstance();
+			for (Map.Entry<String, String> component : this.components.entrySet()) {
+				builder.queryParam(component.getKey(),
+						UriUtils.encode(component.getValue(), StandardCharsets.ISO_8859_1));
+			}
+			String queryString = builder.build(true).toString().substring(1);
+			try {
+				byte[] rawSignature = XMLSigningUtil.signWithURI(credential, algorithmUri,
+						queryString.getBytes(StandardCharsets.UTF_8));
+				String b64Signature = Saml2Utils.samlEncode(rawSignature);
+				this.components.put(Saml2ParameterNames.SIGNATURE, b64Signature);
+			}
+			catch (SecurityException ex) {
+				throw new Saml2Exception(ex);
+			}
+			return this.components;
+		}
+
+		private SignatureSigningParameters resolveSigningParameters() {
+			List<Credential> credentials = resolveSigningCredentials();
+			List<String> digests = Collections.singletonList(SignatureConstants.ALGO_ID_DIGEST_SHA256);
+			String canonicalization = SignatureConstants.ALGO_ID_C14N_EXCL_OMIT_COMMENTS;
+			SignatureSigningParametersResolver resolver = new SAMLMetadataSignatureSigningParametersResolver();
+			BasicSignatureSigningConfiguration signingConfiguration = new BasicSignatureSigningConfiguration();
+			signingConfiguration.setSigningCredentials(credentials);
+			signingConfiguration.setSignatureAlgorithms(this.algs);
+			signingConfiguration.setSignatureReferenceDigestMethods(digests);
+			signingConfiguration.setSignatureCanonicalizationAlgorithm(canonicalization);
+			signingConfiguration.setKeyInfoGeneratorManager(buildSignatureKeyInfoGeneratorManager());
+			CriteriaSet criteria = new CriteriaSet(new SignatureSigningConfigurationCriterion(signingConfiguration));
+			try {
+				SignatureSigningParameters parameters = resolver.resolveSingle(criteria);
+				Assert.notNull(parameters, "Failed to resolve any signing credential");
+				return parameters;
+			}
+			catch (Exception ex) {
+				throw new Saml2Exception(ex);
+			}
+		}
+
+		private NamedKeyInfoGeneratorManager buildSignatureKeyInfoGeneratorManager() {
+			final NamedKeyInfoGeneratorManager namedManager = new NamedKeyInfoGeneratorManager();
+
+			namedManager.setUseDefaultManager(true);
+			final KeyInfoGeneratorManager defaultManager = namedManager.getDefaultManager();
+
+			// Generator for X509Credentials
+			final X509KeyInfoGeneratorFactory x509Factory = new X509KeyInfoGeneratorFactory();
+			x509Factory.setEmitEntityCertificate(true);
+			x509Factory.setEmitEntityCertificateChain(true);
+
+			defaultManager.registerFactory(x509Factory);
+
+			return namedManager;
+		}
+
+		private List<Credential> resolveSigningCredentials() {
+			List<Credential> credentials = new ArrayList<>();
+			for (Saml2X509Credential x509Credential : this.credentials) {
+				X509Certificate certificate = x509Credential.getCertificate();
+				PrivateKey privateKey = x509Credential.getPrivateKey();
+				BasicCredential credential = CredentialSupport.getSimpleCredential(certificate, privateKey);
+				credential.setUsageType(UsageType.SIGNING);
+				credentials.add(credential);
+			}
+			return credentials;
+		}
+
+	}
+
+	static final class OpenSaml5VerificationConfigurer implements VerificationConfigurer {
+
+		private final Collection<Saml2X509Credential> credentials;
+
+		private String entityId;
+
+		OpenSaml5VerificationConfigurer(Collection<Saml2X509Credential> credentials) {
+			this.credentials = credentials;
+		}
+
+		@Override
+		public VerificationConfigurer entityId(String entityId) {
+			this.entityId = entityId;
+			return this;
+		}
+
+		private SignatureTrustEngine trustEngine(Collection<Saml2X509Credential> keys) {
+			Set<Credential> credentials = new HashSet<>();
+			for (Saml2X509Credential key : keys) {
+				BasicX509Credential cred = new BasicX509Credential(key.getCertificate());
+				cred.setUsageType(UsageType.SIGNING);
+				cred.setEntityId(this.entityId);
+				credentials.add(cred);
+			}
+			CredentialResolver credentialsResolver = new CollectionCredentialResolver(credentials);
+			return new ExplicitKeySignatureTrustEngine(credentialsResolver,
+					DefaultSecurityConfigurationBootstrap.buildBasicInlineKeyInfoCredentialResolver());
+		}
+
+		private CriteriaSet verificationCriteria(Issuer issuer) {
+			return new CriteriaSet(new EvaluableEntityIDCredentialCriterion(new EntityIdCriterion(issuer.getValue())),
+					new EvaluableProtocolRoleDescriptorCriterion(new ProtocolCriterion(SAMLConstants.SAML20P_NS)),
+					new EvaluableUsageCredentialCriterion(new UsageCriterion(UsageType.SIGNING)));
+		}
+
+		@Override
+		public Collection<Saml2Error> verify(SignableXMLObject signable) {
+			if (signable instanceof StatusResponseType response) {
+				return verifySignature(response.getID(), response.getIssuer(), response.getSignature());
+			}
+			if (signable instanceof RequestAbstractType request) {
+				return verifySignature(request.getID(), request.getIssuer(), request.getSignature());
+			}
+			if (signable instanceof Assertion assertion) {
+				return verifySignature(assertion.getID(), assertion.getIssuer(), assertion.getSignature());
+			}
+			throw new Saml2Exception("Unsupported object of type: " + signable.getClass().getName());
+		}
+
+		private Collection<Saml2Error> verifySignature(String id, Issuer issuer, Signature signature) {
+			SignatureTrustEngine trustEngine = trustEngine(this.credentials);
+			CriteriaSet criteria = verificationCriteria(issuer);
+			Collection<Saml2Error> errors = new ArrayList<>();
+			SAMLSignatureProfileValidator profileValidator = new SAMLSignatureProfileValidator();
+			try {
+				profileValidator.validate(signature);
+			}
+			catch (Exception ex) {
+				errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Invalid signature for object [" + id + "]: "));
+			}
+
+			try {
+				if (!trustEngine.validate(signature, criteria)) {
+					errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+							"Invalid signature for object [" + id + "]"));
+				}
+			}
+			catch (Exception ex) {
+				errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Invalid signature for object [" + id + "]: "));
+			}
+
+			return errors;
+		}
+
+		@Override
+		public Collection<Saml2Error> verify(RedirectParameters parameters) {
+			SignatureTrustEngine trustEngine = trustEngine(this.credentials);
+			CriteriaSet criteria = verificationCriteria(parameters.getIssuer());
+			if (parameters.getAlgorithm() == null) {
+				return Collections.singletonList(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Missing signature algorithm for object [" + parameters.getId() + "]"));
+			}
+			if (!parameters.hasSignature()) {
+				return Collections.singletonList(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Missing signature for object [" + parameters.getId() + "]"));
+			}
+			Collection<Saml2Error> errors = new ArrayList<>();
+			String algorithmUri = parameters.getAlgorithm();
+			try {
+				if (!trustEngine.validate(parameters.getSignature(), parameters.getContent(), algorithmUri, criteria,
+						null)) {
+					errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+							"Invalid signature for object [" + parameters.getId() + "]"));
+				}
+			}
+			catch (Exception ex) {
+				errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Invalid signature for object [" + parameters.getId() + "]: "));
+			}
+			return errors;
+		}
+
+	}
+
+	static final class OpenSaml5DecryptionConfigurer implements DecryptionConfigurer {
+
+		private static final EncryptedKeyResolver encryptedKeyResolver = new ChainingEncryptedKeyResolver(
+				Arrays.asList(new InlineEncryptedKeyResolver(), new EncryptedElementTypeEncryptedKeyResolver(),
+						new SimpleRetrievalMethodEncryptedKeyResolver()));
+
+		private final Decrypter decrypter;
+
+		OpenSaml5DecryptionConfigurer(Collection<Saml2X509Credential> decryptionCredentials) {
+			this.decrypter = decrypter(decryptionCredentials);
+		}
+
+		private static Decrypter decrypter(Collection<Saml2X509Credential> decryptionCredentials) {
+			Collection<Credential> credentials = new ArrayList<>();
+			for (Saml2X509Credential key : decryptionCredentials) {
+				Credential cred = CredentialSupport.getSimpleCredential(key.getCertificate(), key.getPrivateKey());
+				credentials.add(cred);
+			}
+			KeyInfoCredentialResolver resolver = new CollectionKeyInfoCredentialResolver(credentials);
+			Decrypter decrypter = new Decrypter(null, resolver, encryptedKeyResolver);
+			decrypter.setRootInNewDocument(true);
+			return decrypter;
+		}
+
+		@Override
+		public void decrypt(XMLObject object) {
+			if (object instanceof Response response) {
+				decryptResponse(response);
+				return;
+			}
+			if (object instanceof Assertion assertion) {
+				decryptAssertion(assertion);
+			}
+			if (object instanceof LogoutRequest request) {
+				decryptLogoutRequest(request);
+			}
+		}
+
+		/*
+		 * The methods that follow are adapted from OpenSAML's {@link DecryptAssertions},
+		 * {@link DecryptNameIDs}, and {@link DecryptAttributes}.
+		 *
+		 * <p>The reason that these OpenSAML classes are not used directly is because they
+		 * reference {@link javax.servlet.http.HttpServletRequest} which is a lower
+		 * Servlet API version than what Spring Security SAML uses.
+		 *
+		 * If OpenSAML 5 updates to {@link jakarta.servlet.http.HttpServletRequest}, then
+		 * this arrangement can be revisited.
+		 */
+
+		private void decryptResponse(Response response) {
+			Collection<Assertion> decrypteds = new ArrayList<>();
+			Collection<EncryptedAssertion> encrypteds = new ArrayList<>();
+
+			int count = 0;
+			int size = response.getEncryptedAssertions().size();
+			for (EncryptedAssertion encrypted : response.getEncryptedAssertions()) {
+				logger.trace(String.format("Decrypting EncryptedAssertion (%d/%d) in Response [%s]", count, size,
+						response.getID()));
+				try {
+					Assertion decrypted = this.decrypter.decrypt(encrypted);
+					if (decrypted != null) {
+						encrypteds.add(encrypted);
+						decrypteds.add(decrypted);
+					}
+					count++;
+				}
+				catch (DecryptionException ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+
+			response.getEncryptedAssertions().removeAll(encrypteds);
+			response.getAssertions().addAll(decrypteds);
+
+			// Re-marshall the response so that any ID attributes within the decrypted
+			// Assertions
+			// will have their ID-ness re-established at the DOM level.
+			if (!decrypteds.isEmpty()) {
+				try {
+					XMLObjectSupport.marshall(response);
+				}
+				catch (final MarshallingException ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+		}
+
+		private void decryptAssertion(Assertion assertion) {
+			for (AttributeStatement statement : assertion.getAttributeStatements()) {
+				decryptAttributes(statement);
+			}
+			decryptSubject(assertion.getSubject());
+			if (assertion.getConditions() != null) {
+				for (Condition c : assertion.getConditions().getConditions()) {
+					if (!(c instanceof DelegationRestrictionType delegation)) {
+						continue;
+					}
+					for (Delegate d : delegation.getDelegates()) {
+						if (d.getEncryptedID() != null) {
+							try {
+								NameID decrypted = (NameID) this.decrypter.decrypt(d.getEncryptedID());
+								if (decrypted != null) {
+									d.setNameID(decrypted);
+									d.setEncryptedID(null);
+								}
+							}
+							catch (DecryptionException ex) {
+								throw new Saml2Exception(ex);
+							}
+						}
+					}
+				}
+			}
+		}
+
+		private void decryptAttributes(AttributeStatement statement) {
+			Collection<Attribute> decrypteds = new ArrayList<>();
+			Collection<EncryptedAttribute> encrypteds = new ArrayList<>();
+			for (EncryptedAttribute encrypted : statement.getEncryptedAttributes()) {
+				try {
+					Attribute decrypted = this.decrypter.decrypt(encrypted);
+					if (decrypted != null) {
+						encrypteds.add(encrypted);
+						decrypteds.add(decrypted);
+					}
+				}
+				catch (Exception ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+			statement.getEncryptedAttributes().removeAll(encrypteds);
+			statement.getAttributes().addAll(decrypteds);
+		}
+
+		private void decryptSubject(Subject subject) {
+			if (subject != null) {
+				if (subject.getEncryptedID() != null) {
+					try {
+						NameID decrypted = (NameID) this.decrypter.decrypt(subject.getEncryptedID());
+						if (decrypted != null) {
+							subject.setNameID(decrypted);
+							subject.setEncryptedID(null);
+						}
+					}
+					catch (final DecryptionException ex) {
+						throw new Saml2Exception(ex);
+					}
+				}
+
+				for (final SubjectConfirmation sc : subject.getSubjectConfirmations()) {
+					if (sc.getEncryptedID() != null) {
+						try {
+							NameID decrypted = (NameID) this.decrypter.decrypt(sc.getEncryptedID());
+							if (decrypted != null) {
+								sc.setNameID(decrypted);
+								sc.setEncryptedID(null);
+							}
+						}
+						catch (final DecryptionException ex) {
+							throw new Saml2Exception(ex);
+						}
+					}
+				}
+			}
+		}
+
+		private void decryptLogoutRequest(LogoutRequest request) {
+			if (request.getEncryptedID() != null) {
+				try {
+					NameID decrypted = (NameID) this.decrypter.decrypt(request.getEncryptedID());
+					if (decrypted != null) {
+						request.setNameID(decrypted);
+						request.setEncryptedID(null);
+					}
+				}
+				catch (DecryptionException ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+		}
+
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Main/java/org/springframework/security/saml2/provider/service/registration/OpenSaml5AssertingPartyMetadataRepository.java

@@ -0,0 +1,318 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.registration;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URI;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.function.Consumer;
+
+import javax.annotation.Nonnull;
+
+import net.shibboleth.shared.resolver.CriteriaSet;
+import org.opensaml.core.criterion.EntityIdCriterion;
+import org.opensaml.core.xml.config.XMLObjectProviderRegistrySupport;
+import org.opensaml.saml.criterion.EntityRoleCriterion;
+import org.opensaml.saml.metadata.IterableMetadataSource;
+import org.opensaml.saml.metadata.resolver.MetadataResolver;
+import org.opensaml.saml.metadata.resolver.filter.impl.SignatureValidationFilter;
+import org.opensaml.saml.metadata.resolver.impl.ResourceBackedMetadataResolver;
+import org.opensaml.saml.metadata.resolver.index.impl.RoleMetadataIndex;
+import org.opensaml.saml.saml2.metadata.EntityDescriptor;
+import org.opensaml.security.credential.Credential;
+import org.opensaml.security.credential.impl.CollectionCredentialResolver;
+import org.opensaml.xmlsec.config.impl.DefaultSecurityConfigurationBootstrap;
+import org.opensaml.xmlsec.signature.support.SignatureTrustEngine;
+import org.opensaml.xmlsec.signature.support.impl.ExplicitKeySignatureTrustEngine;
+
+import org.springframework.core.io.DefaultResourceLoader;
+import org.springframework.core.io.Resource;
+import org.springframework.core.io.ResourceLoader;
+import org.springframework.lang.NonNull;
+import org.springframework.lang.Nullable;
+import org.springframework.security.saml2.Saml2Exception;
+import org.springframework.security.saml2.provider.service.registration.BaseOpenSamlAssertingPartyMetadataRepository.MetadataResolverAdapter;
+import org.springframework.util.Assert;
+
+/**
+ * An implementation of {@link AssertingPartyMetadataRepository} that uses a
+ * {@link MetadataResolver} to retrieve {@link AssertingPartyMetadata} instances.
+ *
+ * <p>
+ * The {@link MetadataResolver} constructed in {@link #withTrustedMetadataLocation}
+ * provides expiry-aware refreshing.
+ *
+ * @author Josh Cummings
+ * @since 6.4
+ * @see AssertingPartyMetadataRepository
+ * @see RelyingPartyRegistrations
+ */
+public final class OpenSaml5AssertingPartyMetadataRepository implements AssertingPartyMetadataRepository {
+
+	private final BaseOpenSamlAssertingPartyMetadataRepository delegate;
+
+	/**
+	 * Construct an {@link OpenSaml5AssertingPartyMetadataRepository} using the provided
+	 * {@link MetadataResolver}.
+	 *
+	 * <p>
+	 * The {@link MetadataResolver} should either be of type
+	 * {@link IterableMetadataSource} or it should have a {@link RoleMetadataIndex}
+	 * configured.
+	 * @param metadataResolver the {@link MetadataResolver} to use
+	 */
+	public OpenSaml5AssertingPartyMetadataRepository(MetadataResolver metadataResolver) {
+		Assert.notNull(metadataResolver, "metadataResolver cannot be null");
+		this.delegate = new BaseOpenSamlAssertingPartyMetadataRepository(
+				new CriteriaSetResolverWrapper(metadataResolver));
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	@NonNull
+	public Iterator<AssertingPartyMetadata> iterator() {
+		return this.delegate.iterator();
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Nullable
+	@Override
+	public AssertingPartyMetadata findByEntityId(String entityId) {
+		return this.delegate.findByEntityId(entityId);
+	}
+
+	/**
+	 * Use this trusted {@code metadataLocation} to retrieve refreshable, expiry-aware
+	 * SAML 2.0 Asserting Party (IDP) metadata.
+	 *
+	 * <p>
+	 * Valid locations can be classpath- or file-based or they can be HTTPS endpoints.
+	 * Some valid endpoints might include:
+	 *
+	 * <pre>
+	 *   metadataLocation = "classpath:asserting-party-metadata.xml";
+	 *   metadataLocation = "file:asserting-party-metadata.xml";
+	 *   metadataLocation = "https://ap.example.org/metadata";
+	 * </pre>
+	 *
+	 * <p>
+	 * Resolution of location is attempted immediately. To defer, wrap in
+	 * {@link CachingRelyingPartyRegistrationRepository}.
+	 * @param metadataLocation the classpath- or file-based locations or HTTPS endpoints
+	 * of the asserting party metadata file
+	 * @return the {@link MetadataLocationRepositoryBuilder} for further configuration
+	 */
+	public static MetadataLocationRepositoryBuilder withTrustedMetadataLocation(String metadataLocation) {
+		return new MetadataLocationRepositoryBuilder(metadataLocation, true);
+	}
+
+	/**
+	 * Use this {@code metadataLocation} to retrieve refreshable, expiry-aware SAML 2.0
+	 * Asserting Party (IDP) metadata. Verification credentials are required.
+	 *
+	 * <p>
+	 * Valid locations can be classpath- or file-based or they can be remote endpoints.
+	 * Some valid endpoints might include:
+	 *
+	 * <pre>
+	 *   metadataLocation = "classpath:asserting-party-metadata.xml";
+	 *   metadataLocation = "file:asserting-party-metadata.xml";
+	 *   metadataLocation = "https://ap.example.org/metadata";
+	 * </pre>
+	 *
+	 * <p>
+	 * Resolution of location is attempted immediately. To defer, wrap in
+	 * {@link CachingRelyingPartyRegistrationRepository}.
+	 * @param metadataLocation the classpath- or file-based locations or remote endpoints
+	 * of the asserting party metadata file
+	 * @return the {@link MetadataLocationRepositoryBuilder} for further configuration
+	 */
+	public static MetadataLocationRepositoryBuilder withMetadataLocation(String metadataLocation) {
+		return new MetadataLocationRepositoryBuilder(metadataLocation, false);
+	}
+
+	/**
+	 * A builder class for configuring {@link OpenSaml5AssertingPartyMetadataRepository}
+	 * for a specific metadata location.
+	 *
+	 * @author Josh Cummings
+	 */
+	public static final class MetadataLocationRepositoryBuilder {
+
+		private final String metadataLocation;
+
+		private final boolean requireVerificationCredentials;
+
+		private final Collection<Credential> verificationCredentials = new ArrayList<>();
+
+		private ResourceLoader resourceLoader = new DefaultResourceLoader();
+
+		MetadataLocationRepositoryBuilder(String metadataLocation, boolean trusted) {
+			this.metadataLocation = metadataLocation;
+			this.requireVerificationCredentials = !trusted;
+		}
+
+		public MetadataLocationRepositoryBuilder verificationCredentials(Consumer<Collection<Credential>> credentials) {
+			credentials.accept(this.verificationCredentials);
+			return this;
+		}
+
+		public MetadataLocationRepositoryBuilder resourceLoader(ResourceLoader resourceLoader) {
+			this.resourceLoader = resourceLoader;
+			return this;
+		}
+
+		public OpenSaml5AssertingPartyMetadataRepository build() {
+			return new OpenSaml5AssertingPartyMetadataRepository(metadataResolver());
+		}
+
+		private MetadataResolver metadataResolver() {
+			ResourceBackedMetadataResolver metadataResolver = resourceBackedMetadataResolver();
+			boolean missingCredentials = this.requireVerificationCredentials && this.verificationCredentials.isEmpty();
+			Assert.isTrue(!missingCredentials, "Verification credentials are required");
+			return initialize(metadataResolver);
+		}
+
+		private ResourceBackedMetadataResolver resourceBackedMetadataResolver() {
+			Resource resource = this.resourceLoader.getResource(this.metadataLocation);
+			try {
+				ResourceBackedMetadataResolver metadataResolver = new ResourceBackedMetadataResolver(
+						new SpringResource(resource));
+				if (this.verificationCredentials.isEmpty()) {
+					return metadataResolver;
+				}
+				SignatureTrustEngine engine = new ExplicitKeySignatureTrustEngine(
+						new CollectionCredentialResolver(this.verificationCredentials),
+						DefaultSecurityConfigurationBootstrap.buildBasicInlineKeyInfoCredentialResolver());
+				SignatureValidationFilter filter = new SignatureValidationFilter(engine);
+				filter.setRequireSignedRoot(true);
+				metadataResolver.setMetadataFilter(filter);
+				filter.initialize();
+				return metadataResolver;
+			}
+			catch (Exception ex) {
+				throw new Saml2Exception(ex);
+			}
+		}
+
+		private MetadataResolver initialize(ResourceBackedMetadataResolver metadataResolver) {
+			metadataResolver.setParserPool(XMLObjectProviderRegistrySupport.getParserPool());
+			return BaseOpenSamlAssertingPartyMetadataRepository.initialize(metadataResolver);
+		}
+
+		private static final class SpringResource implements net.shibboleth.shared.resource.Resource {
+
+			private final Resource resource;
+
+			SpringResource(Resource resource) {
+				this.resource = resource;
+			}
+
+			@Override
+			public boolean exists() {
+				return this.resource.exists();
+			}
+
+			@Override
+			public boolean isReadable() {
+				return this.resource.isReadable();
+			}
+
+			@Override
+			public boolean isOpen() {
+				return this.resource.isOpen();
+			}
+
+			@Override
+			public URL getURL() throws IOException {
+				return this.resource.getURL();
+			}
+
+			@Override
+			public URI getURI() throws IOException {
+				return this.resource.getURI();
+			}
+
+			@Override
+			public File getFile() throws IOException {
+				return this.resource.getFile();
+			}
+
+			@Nonnull
+			@Override
+			public InputStream getInputStream() throws IOException {
+				return this.resource.getInputStream();
+			}
+
+			@Override
+			public long contentLength() throws IOException {
+				return this.resource.contentLength();
+			}
+
+			@Override
+			public long lastModified() throws IOException {
+				return this.resource.lastModified();
+			}
+
+			@Override
+			public net.shibboleth.shared.resource.Resource createRelativeResource(String relativePath)
+					throws IOException {
+				return new SpringResource(this.resource.createRelative(relativePath));
+			}
+
+			@Override
+			public String getFilename() {
+				return this.resource.getFilename();
+			}
+
+			@Override
+			public String getDescription() {
+				return this.resource.getDescription();
+			}
+
+		}
+
+	}
+
+	private static final class CriteriaSetResolverWrapper extends MetadataResolverAdapter {
+
+		CriteriaSetResolverWrapper(MetadataResolver metadataResolver) {
+			super(metadataResolver);
+		}
+
+		@Override
+		EntityDescriptor resolveSingle(EntityIdCriterion entityId) throws Exception {
+			return super.metadataResolver.resolveSingle(new CriteriaSet(entityId));
+		}
+
+		@Override
+		Iterable<EntityDescriptor> resolve(EntityRoleCriterion role) throws Exception {
+			return super.metadataResolver.resolve(new CriteriaSet(role));
+		}
+
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Main/java/org/springframework/security/saml2/provider/service/registration/OpenSaml5Template.java

@@ -0,0 +1,617 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.registration;
+
+import java.io.ByteArrayInputStream;
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
+import java.security.PrivateKey;
+import java.security.cert.X509Certificate;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import javax.xml.namespace.QName;
+
+import net.shibboleth.shared.resolver.CriteriaSet;
+import net.shibboleth.shared.xml.SerializeSupport;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.opensaml.core.criterion.EntityIdCriterion;
+import org.opensaml.core.xml.XMLObject;
+import org.opensaml.core.xml.XMLObjectBuilder;
+import org.opensaml.core.xml.config.XMLObjectProviderRegistrySupport;
+import org.opensaml.core.xml.io.Marshaller;
+import org.opensaml.core.xml.io.MarshallingException;
+import org.opensaml.core.xml.io.Unmarshaller;
+import org.opensaml.core.xml.io.UnmarshallerFactory;
+import org.opensaml.core.xml.util.XMLObjectSupport;
+import org.opensaml.saml.common.xml.SAMLConstants;
+import org.opensaml.saml.criterion.ProtocolCriterion;
+import org.opensaml.saml.ext.saml2delrestrict.Delegate;
+import org.opensaml.saml.ext.saml2delrestrict.DelegationRestrictionType;
+import org.opensaml.saml.metadata.criteria.role.impl.EvaluableProtocolRoleDescriptorCriterion;
+import org.opensaml.saml.saml2.core.Assertion;
+import org.opensaml.saml.saml2.core.Attribute;
+import org.opensaml.saml.saml2.core.AttributeStatement;
+import org.opensaml.saml.saml2.core.Condition;
+import org.opensaml.saml.saml2.core.EncryptedAssertion;
+import org.opensaml.saml.saml2.core.EncryptedAttribute;
+import org.opensaml.saml.saml2.core.Issuer;
+import org.opensaml.saml.saml2.core.LogoutRequest;
+import org.opensaml.saml.saml2.core.NameID;
+import org.opensaml.saml.saml2.core.RequestAbstractType;
+import org.opensaml.saml.saml2.core.Response;
+import org.opensaml.saml.saml2.core.StatusResponseType;
+import org.opensaml.saml.saml2.core.Subject;
+import org.opensaml.saml.saml2.core.SubjectConfirmation;
+import org.opensaml.saml.saml2.encryption.Decrypter;
+import org.opensaml.saml.saml2.encryption.EncryptedElementTypeEncryptedKeyResolver;
+import org.opensaml.saml.security.impl.SAMLMetadataSignatureSigningParametersResolver;
+import org.opensaml.saml.security.impl.SAMLSignatureProfileValidator;
+import org.opensaml.security.SecurityException;
+import org.opensaml.security.credential.BasicCredential;
+import org.opensaml.security.credential.Credential;
+import org.opensaml.security.credential.CredentialResolver;
+import org.opensaml.security.credential.CredentialSupport;
+import org.opensaml.security.credential.UsageType;
+import org.opensaml.security.credential.criteria.impl.EvaluableEntityIDCredentialCriterion;
+import org.opensaml.security.credential.criteria.impl.EvaluableUsageCredentialCriterion;
+import org.opensaml.security.credential.impl.CollectionCredentialResolver;
+import org.opensaml.security.criteria.UsageCriterion;
+import org.opensaml.security.x509.BasicX509Credential;
+import org.opensaml.xmlsec.SignatureSigningParameters;
+import org.opensaml.xmlsec.SignatureSigningParametersResolver;
+import org.opensaml.xmlsec.config.impl.DefaultSecurityConfigurationBootstrap;
+import org.opensaml.xmlsec.criterion.SignatureSigningConfigurationCriterion;
+import org.opensaml.xmlsec.crypto.XMLSigningUtil;
+import org.opensaml.xmlsec.encryption.support.ChainingEncryptedKeyResolver;
+import org.opensaml.xmlsec.encryption.support.DecryptionException;
+import org.opensaml.xmlsec.encryption.support.EncryptedKeyResolver;
+import org.opensaml.xmlsec.encryption.support.InlineEncryptedKeyResolver;
+import org.opensaml.xmlsec.encryption.support.SimpleRetrievalMethodEncryptedKeyResolver;
+import org.opensaml.xmlsec.impl.BasicSignatureSigningConfiguration;
+import org.opensaml.xmlsec.keyinfo.KeyInfoCredentialResolver;
+import org.opensaml.xmlsec.keyinfo.KeyInfoGeneratorManager;
+import org.opensaml.xmlsec.keyinfo.NamedKeyInfoGeneratorManager;
+import org.opensaml.xmlsec.keyinfo.impl.CollectionKeyInfoCredentialResolver;
+import org.opensaml.xmlsec.keyinfo.impl.X509KeyInfoGeneratorFactory;
+import org.opensaml.xmlsec.signature.SignableXMLObject;
+import org.opensaml.xmlsec.signature.Signature;
+import org.opensaml.xmlsec.signature.support.SignatureConstants;
+import org.opensaml.xmlsec.signature.support.SignatureSupport;
+import org.opensaml.xmlsec.signature.support.SignatureTrustEngine;
+import org.opensaml.xmlsec.signature.support.impl.ExplicitKeySignatureTrustEngine;
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+
+import org.springframework.security.saml2.Saml2Exception;
+import org.springframework.security.saml2.core.Saml2Error;
+import org.springframework.security.saml2.core.Saml2ErrorCodes;
+import org.springframework.security.saml2.core.Saml2ParameterNames;
+import org.springframework.security.saml2.core.Saml2X509Credential;
+import org.springframework.util.Assert;
+import org.springframework.web.util.UriComponentsBuilder;
+import org.springframework.web.util.UriUtils;
+
+/**
+ * For internal use only. Subject to breaking changes at any time.
+ */
+final class OpenSaml5Template implements OpenSamlOperations {
+
+	private static final Log logger = LogFactory.getLog(OpenSaml5Template.class);
+
+	@Override
+	public <T extends XMLObject> T build(QName elementName) {
+		XMLObjectBuilder<?> builder = XMLObjectProviderRegistrySupport.getBuilderFactory().getBuilder(elementName);
+		if (builder == null) {
+			throw new Saml2Exception("Unable to resolve Builder for " + elementName);
+		}
+		return (T) builder.buildObject(elementName);
+	}
+
+	@Override
+	public <T extends XMLObject> T deserialize(String serialized) {
+		return deserialize(new ByteArrayInputStream(serialized.getBytes(StandardCharsets.UTF_8)));
+	}
+
+	@Override
+	public <T extends XMLObject> T deserialize(InputStream serialized) {
+		try {
+			Document document = XMLObjectProviderRegistrySupport.getParserPool().parse(serialized);
+			Element element = document.getDocumentElement();
+			UnmarshallerFactory factory = XMLObjectProviderRegistrySupport.getUnmarshallerFactory();
+			Unmarshaller unmarshaller = factory.getUnmarshaller(element);
+			if (unmarshaller == null) {
+				throw new Saml2Exception("Unsupported element of type " + element.getTagName());
+			}
+			return (T) unmarshaller.unmarshall(element);
+		}
+		catch (Saml2Exception ex) {
+			throw ex;
+		}
+		catch (Exception ex) {
+			throw new Saml2Exception("Failed to deserialize payload", ex);
+		}
+	}
+
+	@Override
+	public OpenSaml5SerializationConfigurer serialize(XMLObject object) {
+		Marshaller marshaller = XMLObjectProviderRegistrySupport.getMarshallerFactory().getMarshaller(object);
+		try {
+			return serialize(marshaller.marshall(object));
+		}
+		catch (MarshallingException ex) {
+			throw new Saml2Exception(ex);
+		}
+	}
+
+	@Override
+	public OpenSaml5SerializationConfigurer serialize(Element element) {
+		return new OpenSaml5SerializationConfigurer(element);
+	}
+
+	@Override
+	public OpenSaml5SignatureConfigurer withSigningKeys(Collection<Saml2X509Credential> credentials) {
+		return new OpenSaml5SignatureConfigurer(credentials);
+	}
+
+	@Override
+	public OpenSaml5VerificationConfigurer withVerificationKeys(Collection<Saml2X509Credential> credentials) {
+		return new OpenSaml5VerificationConfigurer(credentials);
+	}
+
+	@Override
+	public OpenSaml5DecryptionConfigurer withDecryptionKeys(Collection<Saml2X509Credential> credentials) {
+		return new OpenSaml5DecryptionConfigurer(credentials);
+	}
+
+	OpenSaml5Template() {
+
+	}
+
+	static final class OpenSaml5SerializationConfigurer
+			implements SerializationConfigurer<OpenSaml5SerializationConfigurer> {
+
+		private final Element element;
+
+		boolean pretty;
+
+		OpenSaml5SerializationConfigurer(Element element) {
+			this.element = element;
+		}
+
+		@Override
+		public OpenSaml5SerializationConfigurer prettyPrint(boolean pretty) {
+			this.pretty = pretty;
+			return this;
+		}
+
+		@Override
+		public String serialize() {
+			if (this.pretty) {
+				return SerializeSupport.prettyPrintXML(this.element);
+			}
+			return SerializeSupport.nodeToString(this.element);
+		}
+
+	}
+
+	static final class OpenSaml5SignatureConfigurer implements SignatureConfigurer<OpenSaml5SignatureConfigurer> {
+
+		private final Collection<Saml2X509Credential> credentials;
+
+		private final Map<String, String> components = new LinkedHashMap<>();
+
+		private List<String> algs = List.of(SignatureConstants.ALGO_ID_SIGNATURE_RSA_SHA256);
+
+		OpenSaml5SignatureConfigurer(Collection<Saml2X509Credential> credentials) {
+			this.credentials = credentials;
+		}
+
+		@Override
+		public OpenSaml5SignatureConfigurer algorithms(List<String> algs) {
+			this.algs = algs;
+			return this;
+		}
+
+		@Override
+		public <O extends SignableXMLObject> O sign(O object) {
+			SignatureSigningParameters parameters = resolveSigningParameters();
+			try {
+				SignatureSupport.signObject(object, parameters);
+			}
+			catch (Exception ex) {
+				throw new Saml2Exception(ex);
+			}
+			return object;
+		}
+
+		@Override
+		public Map<String, String> sign(Map<String, String> params) {
+			SignatureSigningParameters parameters = resolveSigningParameters();
+			this.components.putAll(params);
+			Credential credential = parameters.getSigningCredential();
+			String algorithmUri = parameters.getSignatureAlgorithm();
+			this.components.put(Saml2ParameterNames.SIG_ALG, algorithmUri);
+			UriComponentsBuilder builder = UriComponentsBuilder.newInstance();
+			for (Map.Entry<String, String> component : this.components.entrySet()) {
+				builder.queryParam(component.getKey(),
+						UriUtils.encode(component.getValue(), StandardCharsets.ISO_8859_1));
+			}
+			String queryString = builder.build(true).toString().substring(1);
+			try {
+				byte[] rawSignature = XMLSigningUtil.signWithURI(credential, algorithmUri,
+						queryString.getBytes(StandardCharsets.UTF_8));
+				String b64Signature = Saml2Utils.samlEncode(rawSignature);
+				this.components.put(Saml2ParameterNames.SIGNATURE, b64Signature);
+			}
+			catch (SecurityException ex) {
+				throw new Saml2Exception(ex);
+			}
+			return this.components;
+		}
+
+		private SignatureSigningParameters resolveSigningParameters() {
+			List<Credential> credentials = resolveSigningCredentials();
+			List<String> digests = Collections.singletonList(SignatureConstants.ALGO_ID_DIGEST_SHA256);
+			String canonicalization = SignatureConstants.ALGO_ID_C14N_EXCL_OMIT_COMMENTS;
+			SignatureSigningParametersResolver resolver = new SAMLMetadataSignatureSigningParametersResolver();
+			BasicSignatureSigningConfiguration signingConfiguration = new BasicSignatureSigningConfiguration();
+			signingConfiguration.setSigningCredentials(credentials);
+			signingConfiguration.setSignatureAlgorithms(this.algs);
+			signingConfiguration.setSignatureReferenceDigestMethods(digests);
+			signingConfiguration.setSignatureCanonicalizationAlgorithm(canonicalization);
+			signingConfiguration.setKeyInfoGeneratorManager(buildSignatureKeyInfoGeneratorManager());
+			CriteriaSet criteria = new CriteriaSet(new SignatureSigningConfigurationCriterion(signingConfiguration));
+			try {
+				SignatureSigningParameters parameters = resolver.resolveSingle(criteria);
+				Assert.notNull(parameters, "Failed to resolve any signing credential");
+				return parameters;
+			}
+			catch (Exception ex) {
+				throw new Saml2Exception(ex);
+			}
+		}
+
+		private NamedKeyInfoGeneratorManager buildSignatureKeyInfoGeneratorManager() {
+			final NamedKeyInfoGeneratorManager namedManager = new NamedKeyInfoGeneratorManager();
+
+			namedManager.setUseDefaultManager(true);
+			final KeyInfoGeneratorManager defaultManager = namedManager.getDefaultManager();
+
+			// Generator for X509Credentials
+			final X509KeyInfoGeneratorFactory x509Factory = new X509KeyInfoGeneratorFactory();
+			x509Factory.setEmitEntityCertificate(true);
+			x509Factory.setEmitEntityCertificateChain(true);
+
+			defaultManager.registerFactory(x509Factory);
+
+			return namedManager;
+		}
+
+		private List<Credential> resolveSigningCredentials() {
+			List<Credential> credentials = new ArrayList<>();
+			for (Saml2X509Credential x509Credential : this.credentials) {
+				X509Certificate certificate = x509Credential.getCertificate();
+				PrivateKey privateKey = x509Credential.getPrivateKey();
+				BasicCredential credential = CredentialSupport.getSimpleCredential(certificate, privateKey);
+				credential.setUsageType(UsageType.SIGNING);
+				credentials.add(credential);
+			}
+			return credentials;
+		}
+
+	}
+
+	static final class OpenSaml5VerificationConfigurer implements VerificationConfigurer {
+
+		private final Collection<Saml2X509Credential> credentials;
+
+		private String entityId;
+
+		OpenSaml5VerificationConfigurer(Collection<Saml2X509Credential> credentials) {
+			this.credentials = credentials;
+		}
+
+		@Override
+		public VerificationConfigurer entityId(String entityId) {
+			this.entityId = entityId;
+			return this;
+		}
+
+		private SignatureTrustEngine trustEngine(Collection<Saml2X509Credential> keys) {
+			Set<Credential> credentials = new HashSet<>();
+			for (Saml2X509Credential key : keys) {
+				BasicX509Credential cred = new BasicX509Credential(key.getCertificate());
+				cred.setUsageType(UsageType.SIGNING);
+				cred.setEntityId(this.entityId);
+				credentials.add(cred);
+			}
+			CredentialResolver credentialsResolver = new CollectionCredentialResolver(credentials);
+			return new ExplicitKeySignatureTrustEngine(credentialsResolver,
+					DefaultSecurityConfigurationBootstrap.buildBasicInlineKeyInfoCredentialResolver());
+		}
+
+		private CriteriaSet verificationCriteria(Issuer issuer) {
+			return new CriteriaSet(new EvaluableEntityIDCredentialCriterion(new EntityIdCriterion(issuer.getValue())),
+					new EvaluableProtocolRoleDescriptorCriterion(new ProtocolCriterion(SAMLConstants.SAML20P_NS)),
+					new EvaluableUsageCredentialCriterion(new UsageCriterion(UsageType.SIGNING)));
+		}
+
+		@Override
+		public Collection<Saml2Error> verify(SignableXMLObject signable) {
+			if (signable instanceof StatusResponseType response) {
+				return verifySignature(response.getID(), response.getIssuer(), response.getSignature());
+			}
+			if (signable instanceof RequestAbstractType request) {
+				return verifySignature(request.getID(), request.getIssuer(), request.getSignature());
+			}
+			if (signable instanceof Assertion assertion) {
+				return verifySignature(assertion.getID(), assertion.getIssuer(), assertion.getSignature());
+			}
+			throw new Saml2Exception("Unsupported object of type: " + signable.getClass().getName());
+		}
+
+		private Collection<Saml2Error> verifySignature(String id, Issuer issuer, Signature signature) {
+			SignatureTrustEngine trustEngine = trustEngine(this.credentials);
+			CriteriaSet criteria = verificationCriteria(issuer);
+			Collection<Saml2Error> errors = new ArrayList<>();
+			SAMLSignatureProfileValidator profileValidator = new SAMLSignatureProfileValidator();
+			try {
+				profileValidator.validate(signature);
+			}
+			catch (Exception ex) {
+				errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Invalid signature for object [" + id + "]: "));
+			}
+
+			try {
+				if (!trustEngine.validate(signature, criteria)) {
+					errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+							"Invalid signature for object [" + id + "]"));
+				}
+			}
+			catch (Exception ex) {
+				errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Invalid signature for object [" + id + "]: "));
+			}
+
+			return errors;
+		}
+
+		@Override
+		public Collection<Saml2Error> verify(RedirectParameters parameters) {
+			SignatureTrustEngine trustEngine = trustEngine(this.credentials);
+			CriteriaSet criteria = verificationCriteria(parameters.getIssuer());
+			if (parameters.getAlgorithm() == null) {
+				return Collections.singletonList(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Missing signature algorithm for object [" + parameters.getId() + "]"));
+			}
+			if (!parameters.hasSignature()) {
+				return Collections.singletonList(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Missing signature for object [" + parameters.getId() + "]"));
+			}
+			Collection<Saml2Error> errors = new ArrayList<>();
+			String algorithmUri = parameters.getAlgorithm();
+			try {
+				if (!trustEngine.validate(parameters.getSignature(), parameters.getContent(), algorithmUri, criteria,
+						null)) {
+					errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+							"Invalid signature for object [" + parameters.getId() + "]"));
+				}
+			}
+			catch (Exception ex) {
+				errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Invalid signature for object [" + parameters.getId() + "]: "));
+			}
+			return errors;
+		}
+
+	}
+
+	static final class OpenSaml5DecryptionConfigurer implements DecryptionConfigurer {
+
+		private static final EncryptedKeyResolver encryptedKeyResolver = new ChainingEncryptedKeyResolver(
+				Arrays.asList(new InlineEncryptedKeyResolver(), new EncryptedElementTypeEncryptedKeyResolver(),
+						new SimpleRetrievalMethodEncryptedKeyResolver()));
+
+		private final Decrypter decrypter;
+
+		OpenSaml5DecryptionConfigurer(Collection<Saml2X509Credential> decryptionCredentials) {
+			this.decrypter = decrypter(decryptionCredentials);
+		}
+
+		private static Decrypter decrypter(Collection<Saml2X509Credential> decryptionCredentials) {
+			Collection<Credential> credentials = new ArrayList<>();
+			for (Saml2X509Credential key : decryptionCredentials) {
+				Credential cred = CredentialSupport.getSimpleCredential(key.getCertificate(), key.getPrivateKey());
+				credentials.add(cred);
+			}
+			KeyInfoCredentialResolver resolver = new CollectionKeyInfoCredentialResolver(credentials);
+			Decrypter decrypter = new Decrypter(null, resolver, encryptedKeyResolver);
+			decrypter.setRootInNewDocument(true);
+			return decrypter;
+		}
+
+		@Override
+		public void decrypt(XMLObject object) {
+			if (object instanceof Response response) {
+				decryptResponse(response);
+				return;
+			}
+			if (object instanceof Assertion assertion) {
+				decryptAssertion(assertion);
+			}
+			if (object instanceof LogoutRequest request) {
+				decryptLogoutRequest(request);
+			}
+		}
+
+		/*
+		 * The methods that follow are adapted from OpenSAML's {@link DecryptAssertions},
+		 * {@link DecryptNameIDs}, and {@link DecryptAttributes}.
+		 *
+		 * <p>The reason that these OpenSAML classes are not used directly is because they
+		 * reference {@link javax.servlet.http.HttpServletRequest} which is a lower
+		 * Servlet API version than what Spring Security SAML uses.
+		 *
+		 * If OpenSAML 5 updates to {@link jakarta.servlet.http.HttpServletRequest}, then
+		 * this arrangement can be revisited.
+		 */
+
+		private void decryptResponse(Response response) {
+			Collection<Assertion> decrypteds = new ArrayList<>();
+			Collection<EncryptedAssertion> encrypteds = new ArrayList<>();
+
+			int count = 0;
+			int size = response.getEncryptedAssertions().size();
+			for (EncryptedAssertion encrypted : response.getEncryptedAssertions()) {
+				logger.trace(String.format("Decrypting EncryptedAssertion (%d/%d) in Response [%s]", count, size,
+						response.getID()));
+				try {
+					Assertion decrypted = this.decrypter.decrypt(encrypted);
+					if (decrypted != null) {
+						encrypteds.add(encrypted);
+						decrypteds.add(decrypted);
+					}
+					count++;
+				}
+				catch (DecryptionException ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+
+			response.getEncryptedAssertions().removeAll(encrypteds);
+			response.getAssertions().addAll(decrypteds);
+
+			// Re-marshall the response so that any ID attributes within the decrypted
+			// Assertions
+			// will have their ID-ness re-established at the DOM level.
+			if (!decrypteds.isEmpty()) {
+				try {
+					XMLObjectSupport.marshall(response);
+				}
+				catch (final MarshallingException ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+		}
+
+		private void decryptAssertion(Assertion assertion) {
+			for (AttributeStatement statement : assertion.getAttributeStatements()) {
+				decryptAttributes(statement);
+			}
+			decryptSubject(assertion.getSubject());
+			if (assertion.getConditions() != null) {
+				for (Condition c : assertion.getConditions().getConditions()) {
+					if (!(c instanceof DelegationRestrictionType delegation)) {
+						continue;
+					}
+					for (Delegate d : delegation.getDelegates()) {
+						if (d.getEncryptedID() != null) {
+							try {
+								NameID decrypted = (NameID) this.decrypter.decrypt(d.getEncryptedID());
+								if (decrypted != null) {
+									d.setNameID(decrypted);
+									d.setEncryptedID(null);
+								}
+							}
+							catch (DecryptionException ex) {
+								throw new Saml2Exception(ex);
+							}
+						}
+					}
+				}
+			}
+		}
+
+		private void decryptAttributes(AttributeStatement statement) {
+			Collection<Attribute> decrypteds = new ArrayList<>();
+			Collection<EncryptedAttribute> encrypteds = new ArrayList<>();
+			for (EncryptedAttribute encrypted : statement.getEncryptedAttributes()) {
+				try {
+					Attribute decrypted = this.decrypter.decrypt(encrypted);
+					if (decrypted != null) {
+						encrypteds.add(encrypted);
+						decrypteds.add(decrypted);
+					}
+				}
+				catch (Exception ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+			statement.getEncryptedAttributes().removeAll(encrypteds);
+			statement.getAttributes().addAll(decrypteds);
+		}
+
+		private void decryptSubject(Subject subject) {
+			if (subject != null) {
+				if (subject.getEncryptedID() != null) {
+					try {
+						NameID decrypted = (NameID) this.decrypter.decrypt(subject.getEncryptedID());
+						if (decrypted != null) {
+							subject.setNameID(decrypted);
+							subject.setEncryptedID(null);
+						}
+					}
+					catch (final DecryptionException ex) {
+						throw new Saml2Exception(ex);
+					}
+				}
+
+				for (final SubjectConfirmation sc : subject.getSubjectConfirmations()) {
+					if (sc.getEncryptedID() != null) {
+						try {
+							NameID decrypted = (NameID) this.decrypter.decrypt(sc.getEncryptedID());
+							if (decrypted != null) {
+								sc.setNameID(decrypted);
+								sc.setEncryptedID(null);
+							}
+						}
+						catch (final DecryptionException ex) {
+							throw new Saml2Exception(ex);
+						}
+					}
+				}
+			}
+		}
+
+		private void decryptLogoutRequest(LogoutRequest request) {
+			if (request.getEncryptedID() != null) {
+				try {
+					NameID decrypted = (NameID) this.decrypter.decrypt(request.getEncryptedID());
+					if (decrypted != null) {
+						request.setNameID(decrypted);
+						request.setEncryptedID(null);
+					}
+				}
+				catch (DecryptionException ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+		}
+
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Main/java/org/springframework/security/saml2/provider/service/web/OpenSaml5AuthenticationTokenConverter.java

@@ -0,0 +1,104 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.web;
+
+import jakarta.servlet.http.HttpServletRequest;
+
+import org.springframework.security.saml2.provider.service.authentication.AbstractSaml2AuthenticationRequest;
+import org.springframework.security.saml2.provider.service.authentication.Saml2AuthenticationException;
+import org.springframework.security.saml2.provider.service.authentication.Saml2AuthenticationToken;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistration;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistrationRepository;
+import org.springframework.security.web.authentication.AuthenticationConverter;
+import org.springframework.security.web.util.matcher.RequestMatcher;
+import org.springframework.util.Assert;
+
+/**
+ * An {@link AuthenticationConverter} that generates a {@link Saml2AuthenticationToken}
+ * appropriate for authenticated a SAML 2.0 Assertion against an
+ * {@link org.springframework.security.authentication.AuthenticationManager}.
+ *
+ * @author Josh Cummings
+ * @since 6.1
+ */
+public final class OpenSaml5AuthenticationTokenConverter implements AuthenticationConverter {
+
+	private final BaseOpenSamlAuthenticationTokenConverter delegate;
+
+	/**
+	 * Constructs a {@link OpenSaml5AuthenticationTokenConverter} given a repository for
+	 * {@link RelyingPartyRegistration}s
+	 * @param registrations the repository for {@link RelyingPartyRegistration}s
+	 * {@link RelyingPartyRegistration}s
+	 */
+	public OpenSaml5AuthenticationTokenConverter(RelyingPartyRegistrationRepository registrations) {
+		Assert.notNull(registrations, "relyingPartyRegistrationRepository cannot be null");
+		this.delegate = new BaseOpenSamlAuthenticationTokenConverter(registrations, new OpenSaml5Template());
+	}
+
+	/**
+	 * Resolve an authentication request from the given {@link HttpServletRequest}.
+	 *
+	 * <p>
+	 * First uses the configured {@link RequestMatcher} to deduce whether an
+	 * authentication request is being made and optionally for which
+	 * {@code registrationId}.
+	 *
+	 * <p>
+	 * If there is an associated {@code <saml2:AuthnRequest>}, then the
+	 * {@code registrationId} is looked up and used.
+	 *
+	 * <p>
+	 * If a {@code registrationId} is found in the request, then it is looked up and used.
+	 * In that case, if none is found a {@link Saml2AuthenticationException} is thrown.
+	 *
+	 * <p>
+	 * Finally, if no {@code registrationId} is found in the request, then the code
+	 * attempts to resolve the {@link RelyingPartyRegistration} from the SAML Response's
+	 * Issuer.
+	 * @param request the HTTP request
+	 * @return the {@link Saml2AuthenticationToken} authentication request
+	 * @throws Saml2AuthenticationException if the {@link RequestMatcher} specifies a
+	 * non-existent {@code registrationId}
+	 */
+	@Override
+	public Saml2AuthenticationToken convert(HttpServletRequest request) {
+		return this.delegate.convert(request);
+	}
+
+	/**
+	 * Use the given {@link Saml2AuthenticationRequestRepository} to load authentication
+	 * request.
+	 * @param authenticationRequestRepository the
+	 * {@link Saml2AuthenticationRequestRepository} to use
+	 */
+	public void setAuthenticationRequestRepository(
+			Saml2AuthenticationRequestRepository<AbstractSaml2AuthenticationRequest> authenticationRequestRepository) {
+		Assert.notNull(authenticationRequestRepository, "authenticationRequestRepository cannot be null");
+		this.delegate.setAuthenticationRequestRepository(authenticationRequestRepository);
+	}
+
+	/**
+	 * Use the given {@link RequestMatcher} to match the request.
+	 * @param requestMatcher the {@link RequestMatcher} to use
+	 */
+	public void setRequestMatcher(RequestMatcher requestMatcher) {
+		Assert.notNull(requestMatcher, "requestMatcher cannot be null");
+		this.delegate.setRequestMatcher(requestMatcher);
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Main/java/org/springframework/security/saml2/provider/service/web/OpenSaml5Template.java

@@ -0,0 +1,617 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.web;
+
+import java.io.ByteArrayInputStream;
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
+import java.security.PrivateKey;
+import java.security.cert.X509Certificate;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import javax.xml.namespace.QName;
+
+import net.shibboleth.shared.resolver.CriteriaSet;
+import net.shibboleth.shared.xml.SerializeSupport;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.opensaml.core.criterion.EntityIdCriterion;
+import org.opensaml.core.xml.XMLObject;
+import org.opensaml.core.xml.XMLObjectBuilder;
+import org.opensaml.core.xml.config.XMLObjectProviderRegistrySupport;
+import org.opensaml.core.xml.io.Marshaller;
+import org.opensaml.core.xml.io.MarshallingException;
+import org.opensaml.core.xml.io.Unmarshaller;
+import org.opensaml.core.xml.io.UnmarshallerFactory;
+import org.opensaml.core.xml.util.XMLObjectSupport;
+import org.opensaml.saml.common.xml.SAMLConstants;
+import org.opensaml.saml.criterion.ProtocolCriterion;
+import org.opensaml.saml.ext.saml2delrestrict.Delegate;
+import org.opensaml.saml.ext.saml2delrestrict.DelegationRestrictionType;
+import org.opensaml.saml.metadata.criteria.role.impl.EvaluableProtocolRoleDescriptorCriterion;
+import org.opensaml.saml.saml2.core.Assertion;
+import org.opensaml.saml.saml2.core.Attribute;
+import org.opensaml.saml.saml2.core.AttributeStatement;
+import org.opensaml.saml.saml2.core.Condition;
+import org.opensaml.saml.saml2.core.EncryptedAssertion;
+import org.opensaml.saml.saml2.core.EncryptedAttribute;
+import org.opensaml.saml.saml2.core.Issuer;
+import org.opensaml.saml.saml2.core.LogoutRequest;
+import org.opensaml.saml.saml2.core.NameID;
+import org.opensaml.saml.saml2.core.RequestAbstractType;
+import org.opensaml.saml.saml2.core.Response;
+import org.opensaml.saml.saml2.core.StatusResponseType;
+import org.opensaml.saml.saml2.core.Subject;
+import org.opensaml.saml.saml2.core.SubjectConfirmation;
+import org.opensaml.saml.saml2.encryption.Decrypter;
+import org.opensaml.saml.saml2.encryption.EncryptedElementTypeEncryptedKeyResolver;
+import org.opensaml.saml.security.impl.SAMLMetadataSignatureSigningParametersResolver;
+import org.opensaml.saml.security.impl.SAMLSignatureProfileValidator;
+import org.opensaml.security.SecurityException;
+import org.opensaml.security.credential.BasicCredential;
+import org.opensaml.security.credential.Credential;
+import org.opensaml.security.credential.CredentialResolver;
+import org.opensaml.security.credential.CredentialSupport;
+import org.opensaml.security.credential.UsageType;
+import org.opensaml.security.credential.criteria.impl.EvaluableEntityIDCredentialCriterion;
+import org.opensaml.security.credential.criteria.impl.EvaluableUsageCredentialCriterion;
+import org.opensaml.security.credential.impl.CollectionCredentialResolver;
+import org.opensaml.security.criteria.UsageCriterion;
+import org.opensaml.security.x509.BasicX509Credential;
+import org.opensaml.xmlsec.SignatureSigningParameters;
+import org.opensaml.xmlsec.SignatureSigningParametersResolver;
+import org.opensaml.xmlsec.config.impl.DefaultSecurityConfigurationBootstrap;
+import org.opensaml.xmlsec.criterion.SignatureSigningConfigurationCriterion;
+import org.opensaml.xmlsec.crypto.XMLSigningUtil;
+import org.opensaml.xmlsec.encryption.support.ChainingEncryptedKeyResolver;
+import org.opensaml.xmlsec.encryption.support.DecryptionException;
+import org.opensaml.xmlsec.encryption.support.EncryptedKeyResolver;
+import org.opensaml.xmlsec.encryption.support.InlineEncryptedKeyResolver;
+import org.opensaml.xmlsec.encryption.support.SimpleRetrievalMethodEncryptedKeyResolver;
+import org.opensaml.xmlsec.impl.BasicSignatureSigningConfiguration;
+import org.opensaml.xmlsec.keyinfo.KeyInfoCredentialResolver;
+import org.opensaml.xmlsec.keyinfo.KeyInfoGeneratorManager;
+import org.opensaml.xmlsec.keyinfo.NamedKeyInfoGeneratorManager;
+import org.opensaml.xmlsec.keyinfo.impl.CollectionKeyInfoCredentialResolver;
+import org.opensaml.xmlsec.keyinfo.impl.X509KeyInfoGeneratorFactory;
+import org.opensaml.xmlsec.signature.SignableXMLObject;
+import org.opensaml.xmlsec.signature.Signature;
+import org.opensaml.xmlsec.signature.support.SignatureConstants;
+import org.opensaml.xmlsec.signature.support.SignatureSupport;
+import org.opensaml.xmlsec.signature.support.SignatureTrustEngine;
+import org.opensaml.xmlsec.signature.support.impl.ExplicitKeySignatureTrustEngine;
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+
+import org.springframework.security.saml2.Saml2Exception;
+import org.springframework.security.saml2.core.Saml2Error;
+import org.springframework.security.saml2.core.Saml2ErrorCodes;
+import org.springframework.security.saml2.core.Saml2ParameterNames;
+import org.springframework.security.saml2.core.Saml2X509Credential;
+import org.springframework.util.Assert;
+import org.springframework.web.util.UriComponentsBuilder;
+import org.springframework.web.util.UriUtils;
+
+/**
+ * For internal use only. Subject to breaking changes at any time.
+ */
+final class OpenSaml5Template implements OpenSamlOperations {
+
+	private static final Log logger = LogFactory.getLog(OpenSaml5Template.class);
+
+	@Override
+	public <T extends XMLObject> T build(QName elementName) {
+		XMLObjectBuilder<?> builder = XMLObjectProviderRegistrySupport.getBuilderFactory().getBuilder(elementName);
+		if (builder == null) {
+			throw new Saml2Exception("Unable to resolve Builder for " + elementName);
+		}
+		return (T) builder.buildObject(elementName);
+	}
+
+	@Override
+	public <T extends XMLObject> T deserialize(String serialized) {
+		return deserialize(new ByteArrayInputStream(serialized.getBytes(StandardCharsets.UTF_8)));
+	}
+
+	@Override
+	public <T extends XMLObject> T deserialize(InputStream serialized) {
+		try {
+			Document document = XMLObjectProviderRegistrySupport.getParserPool().parse(serialized);
+			Element element = document.getDocumentElement();
+			UnmarshallerFactory factory = XMLObjectProviderRegistrySupport.getUnmarshallerFactory();
+			Unmarshaller unmarshaller = factory.getUnmarshaller(element);
+			if (unmarshaller == null) {
+				throw new Saml2Exception("Unsupported element of type " + element.getTagName());
+			}
+			return (T) unmarshaller.unmarshall(element);
+		}
+		catch (Saml2Exception ex) {
+			throw ex;
+		}
+		catch (Exception ex) {
+			throw new Saml2Exception("Failed to deserialize payload", ex);
+		}
+	}
+
+	@Override
+	public OpenSaml5SerializationConfigurer serialize(XMLObject object) {
+		Marshaller marshaller = XMLObjectProviderRegistrySupport.getMarshallerFactory().getMarshaller(object);
+		try {
+			return serialize(marshaller.marshall(object));
+		}
+		catch (MarshallingException ex) {
+			throw new Saml2Exception(ex);
+		}
+	}
+
+	@Override
+	public OpenSaml5SerializationConfigurer serialize(Element element) {
+		return new OpenSaml5SerializationConfigurer(element);
+	}
+
+	@Override
+	public OpenSaml5SignatureConfigurer withSigningKeys(Collection<Saml2X509Credential> credentials) {
+		return new OpenSaml5SignatureConfigurer(credentials);
+	}
+
+	@Override
+	public OpenSaml5VerificationConfigurer withVerificationKeys(Collection<Saml2X509Credential> credentials) {
+		return new OpenSaml5VerificationConfigurer(credentials);
+	}
+
+	@Override
+	public OpenSaml5DecryptionConfigurer withDecryptionKeys(Collection<Saml2X509Credential> credentials) {
+		return new OpenSaml5DecryptionConfigurer(credentials);
+	}
+
+	OpenSaml5Template() {
+
+	}
+
+	static final class OpenSaml5SerializationConfigurer
+			implements SerializationConfigurer<OpenSaml5SerializationConfigurer> {
+
+		private final Element element;
+
+		boolean pretty;
+
+		OpenSaml5SerializationConfigurer(Element element) {
+			this.element = element;
+		}
+
+		@Override
+		public OpenSaml5SerializationConfigurer prettyPrint(boolean pretty) {
+			this.pretty = pretty;
+			return this;
+		}
+
+		@Override
+		public String serialize() {
+			if (this.pretty) {
+				return SerializeSupport.prettyPrintXML(this.element);
+			}
+			return SerializeSupport.nodeToString(this.element);
+		}
+
+	}
+
+	static final class OpenSaml5SignatureConfigurer implements SignatureConfigurer<OpenSaml5SignatureConfigurer> {
+
+		private final Collection<Saml2X509Credential> credentials;
+
+		private final Map<String, String> components = new LinkedHashMap<>();
+
+		private List<String> algs = List.of(SignatureConstants.ALGO_ID_SIGNATURE_RSA_SHA256);
+
+		OpenSaml5SignatureConfigurer(Collection<Saml2X509Credential> credentials) {
+			this.credentials = credentials;
+		}
+
+		@Override
+		public OpenSaml5SignatureConfigurer algorithms(List<String> algs) {
+			this.algs = algs;
+			return this;
+		}
+
+		@Override
+		public <O extends SignableXMLObject> O sign(O object) {
+			SignatureSigningParameters parameters = resolveSigningParameters();
+			try {
+				SignatureSupport.signObject(object, parameters);
+			}
+			catch (Exception ex) {
+				throw new Saml2Exception(ex);
+			}
+			return object;
+		}
+
+		@Override
+		public Map<String, String> sign(Map<String, String> params) {
+			SignatureSigningParameters parameters = resolveSigningParameters();
+			this.components.putAll(params);
+			Credential credential = parameters.getSigningCredential();
+			String algorithmUri = parameters.getSignatureAlgorithm();
+			this.components.put(Saml2ParameterNames.SIG_ALG, algorithmUri);
+			UriComponentsBuilder builder = UriComponentsBuilder.newInstance();
+			for (Map.Entry<String, String> component : this.components.entrySet()) {
+				builder.queryParam(component.getKey(),
+						UriUtils.encode(component.getValue(), StandardCharsets.ISO_8859_1));
+			}
+			String queryString = builder.build(true).toString().substring(1);
+			try {
+				byte[] rawSignature = XMLSigningUtil.signWithURI(credential, algorithmUri,
+						queryString.getBytes(StandardCharsets.UTF_8));
+				String b64Signature = Saml2Utils.samlEncode(rawSignature);
+				this.components.put(Saml2ParameterNames.SIGNATURE, b64Signature);
+			}
+			catch (SecurityException ex) {
+				throw new Saml2Exception(ex);
+			}
+			return this.components;
+		}
+
+		private SignatureSigningParameters resolveSigningParameters() {
+			List<Credential> credentials = resolveSigningCredentials();
+			List<String> digests = Collections.singletonList(SignatureConstants.ALGO_ID_DIGEST_SHA256);
+			String canonicalization = SignatureConstants.ALGO_ID_C14N_EXCL_OMIT_COMMENTS;
+			SignatureSigningParametersResolver resolver = new SAMLMetadataSignatureSigningParametersResolver();
+			BasicSignatureSigningConfiguration signingConfiguration = new BasicSignatureSigningConfiguration();
+			signingConfiguration.setSigningCredentials(credentials);
+			signingConfiguration.setSignatureAlgorithms(this.algs);
+			signingConfiguration.setSignatureReferenceDigestMethods(digests);
+			signingConfiguration.setSignatureCanonicalizationAlgorithm(canonicalization);
+			signingConfiguration.setKeyInfoGeneratorManager(buildSignatureKeyInfoGeneratorManager());
+			CriteriaSet criteria = new CriteriaSet(new SignatureSigningConfigurationCriterion(signingConfiguration));
+			try {
+				SignatureSigningParameters parameters = resolver.resolveSingle(criteria);
+				Assert.notNull(parameters, "Failed to resolve any signing credential");
+				return parameters;
+			}
+			catch (Exception ex) {
+				throw new Saml2Exception(ex);
+			}
+		}
+
+		private NamedKeyInfoGeneratorManager buildSignatureKeyInfoGeneratorManager() {
+			final NamedKeyInfoGeneratorManager namedManager = new NamedKeyInfoGeneratorManager();
+
+			namedManager.setUseDefaultManager(true);
+			final KeyInfoGeneratorManager defaultManager = namedManager.getDefaultManager();
+
+			// Generator for X509Credentials
+			final X509KeyInfoGeneratorFactory x509Factory = new X509KeyInfoGeneratorFactory();
+			x509Factory.setEmitEntityCertificate(true);
+			x509Factory.setEmitEntityCertificateChain(true);
+
+			defaultManager.registerFactory(x509Factory);
+
+			return namedManager;
+		}
+
+		private List<Credential> resolveSigningCredentials() {
+			List<Credential> credentials = new ArrayList<>();
+			for (Saml2X509Credential x509Credential : this.credentials) {
+				X509Certificate certificate = x509Credential.getCertificate();
+				PrivateKey privateKey = x509Credential.getPrivateKey();
+				BasicCredential credential = CredentialSupport.getSimpleCredential(certificate, privateKey);
+				credential.setUsageType(UsageType.SIGNING);
+				credentials.add(credential);
+			}
+			return credentials;
+		}
+
+	}
+
+	static final class OpenSaml5VerificationConfigurer implements VerificationConfigurer {
+
+		private final Collection<Saml2X509Credential> credentials;
+
+		private String entityId;
+
+		OpenSaml5VerificationConfigurer(Collection<Saml2X509Credential> credentials) {
+			this.credentials = credentials;
+		}
+
+		@Override
+		public VerificationConfigurer entityId(String entityId) {
+			this.entityId = entityId;
+			return this;
+		}
+
+		private SignatureTrustEngine trustEngine(Collection<Saml2X509Credential> keys) {
+			Set<Credential> credentials = new HashSet<>();
+			for (Saml2X509Credential key : keys) {
+				BasicX509Credential cred = new BasicX509Credential(key.getCertificate());
+				cred.setUsageType(UsageType.SIGNING);
+				cred.setEntityId(this.entityId);
+				credentials.add(cred);
+			}
+			CredentialResolver credentialsResolver = new CollectionCredentialResolver(credentials);
+			return new ExplicitKeySignatureTrustEngine(credentialsResolver,
+					DefaultSecurityConfigurationBootstrap.buildBasicInlineKeyInfoCredentialResolver());
+		}
+
+		private CriteriaSet verificationCriteria(Issuer issuer) {
+			return new CriteriaSet(new EvaluableEntityIDCredentialCriterion(new EntityIdCriterion(issuer.getValue())),
+					new EvaluableProtocolRoleDescriptorCriterion(new ProtocolCriterion(SAMLConstants.SAML20P_NS)),
+					new EvaluableUsageCredentialCriterion(new UsageCriterion(UsageType.SIGNING)));
+		}
+
+		@Override
+		public Collection<Saml2Error> verify(SignableXMLObject signable) {
+			if (signable instanceof StatusResponseType response) {
+				return verifySignature(response.getID(), response.getIssuer(), response.getSignature());
+			}
+			if (signable instanceof RequestAbstractType request) {
+				return verifySignature(request.getID(), request.getIssuer(), request.getSignature());
+			}
+			if (signable instanceof Assertion assertion) {
+				return verifySignature(assertion.getID(), assertion.getIssuer(), assertion.getSignature());
+			}
+			throw new Saml2Exception("Unsupported object of type: " + signable.getClass().getName());
+		}
+
+		private Collection<Saml2Error> verifySignature(String id, Issuer issuer, Signature signature) {
+			SignatureTrustEngine trustEngine = trustEngine(this.credentials);
+			CriteriaSet criteria = verificationCriteria(issuer);
+			Collection<Saml2Error> errors = new ArrayList<>();
+			SAMLSignatureProfileValidator profileValidator = new SAMLSignatureProfileValidator();
+			try {
+				profileValidator.validate(signature);
+			}
+			catch (Exception ex) {
+				errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Invalid signature for object [" + id + "]: "));
+			}
+
+			try {
+				if (!trustEngine.validate(signature, criteria)) {
+					errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+							"Invalid signature for object [" + id + "]"));
+				}
+			}
+			catch (Exception ex) {
+				errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Invalid signature for object [" + id + "]: "));
+			}
+
+			return errors;
+		}
+
+		@Override
+		public Collection<Saml2Error> verify(RedirectParameters parameters) {
+			SignatureTrustEngine trustEngine = trustEngine(this.credentials);
+			CriteriaSet criteria = verificationCriteria(parameters.getIssuer());
+			if (parameters.getAlgorithm() == null) {
+				return Collections.singletonList(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Missing signature algorithm for object [" + parameters.getId() + "]"));
+			}
+			if (!parameters.hasSignature()) {
+				return Collections.singletonList(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Missing signature for object [" + parameters.getId() + "]"));
+			}
+			Collection<Saml2Error> errors = new ArrayList<>();
+			String algorithmUri = parameters.getAlgorithm();
+			try {
+				if (!trustEngine.validate(parameters.getSignature(), parameters.getContent(), algorithmUri, criteria,
+						null)) {
+					errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+							"Invalid signature for object [" + parameters.getId() + "]"));
+				}
+			}
+			catch (Exception ex) {
+				errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Invalid signature for object [" + parameters.getId() + "]: "));
+			}
+			return errors;
+		}
+
+	}
+
+	static final class OpenSaml5DecryptionConfigurer implements DecryptionConfigurer {
+
+		private static final EncryptedKeyResolver encryptedKeyResolver = new ChainingEncryptedKeyResolver(
+				Arrays.asList(new InlineEncryptedKeyResolver(), new EncryptedElementTypeEncryptedKeyResolver(),
+						new SimpleRetrievalMethodEncryptedKeyResolver()));
+
+		private final Decrypter decrypter;
+
+		OpenSaml5DecryptionConfigurer(Collection<Saml2X509Credential> decryptionCredentials) {
+			this.decrypter = decrypter(decryptionCredentials);
+		}
+
+		private static Decrypter decrypter(Collection<Saml2X509Credential> decryptionCredentials) {
+			Collection<Credential> credentials = new ArrayList<>();
+			for (Saml2X509Credential key : decryptionCredentials) {
+				Credential cred = CredentialSupport.getSimpleCredential(key.getCertificate(), key.getPrivateKey());
+				credentials.add(cred);
+			}
+			KeyInfoCredentialResolver resolver = new CollectionKeyInfoCredentialResolver(credentials);
+			Decrypter decrypter = new Decrypter(null, resolver, encryptedKeyResolver);
+			decrypter.setRootInNewDocument(true);
+			return decrypter;
+		}
+
+		@Override
+		public void decrypt(XMLObject object) {
+			if (object instanceof Response response) {
+				decryptResponse(response);
+				return;
+			}
+			if (object instanceof Assertion assertion) {
+				decryptAssertion(assertion);
+			}
+			if (object instanceof LogoutRequest request) {
+				decryptLogoutRequest(request);
+			}
+		}
+
+		/*
+		 * The methods that follow are adapted from OpenSAML's {@link DecryptAssertions},
+		 * {@link DecryptNameIDs}, and {@link DecryptAttributes}.
+		 *
+		 * <p>The reason that these OpenSAML classes are not used directly is because they
+		 * reference {@link javax.servlet.http.HttpServletRequest} which is a lower
+		 * Servlet API version than what Spring Security SAML uses.
+		 *
+		 * If OpenSAML 5 updates to {@link jakarta.servlet.http.HttpServletRequest}, then
+		 * this arrangement can be revisited.
+		 */
+
+		private void decryptResponse(Response response) {
+			Collection<Assertion> decrypteds = new ArrayList<>();
+			Collection<EncryptedAssertion> encrypteds = new ArrayList<>();
+
+			int count = 0;
+			int size = response.getEncryptedAssertions().size();
+			for (EncryptedAssertion encrypted : response.getEncryptedAssertions()) {
+				logger.trace(String.format("Decrypting EncryptedAssertion (%d/%d) in Response [%s]", count, size,
+						response.getID()));
+				try {
+					Assertion decrypted = this.decrypter.decrypt(encrypted);
+					if (decrypted != null) {
+						encrypteds.add(encrypted);
+						decrypteds.add(decrypted);
+					}
+					count++;
+				}
+				catch (DecryptionException ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+
+			response.getEncryptedAssertions().removeAll(encrypteds);
+			response.getAssertions().addAll(decrypteds);
+
+			// Re-marshall the response so that any ID attributes within the decrypted
+			// Assertions
+			// will have their ID-ness re-established at the DOM level.
+			if (!decrypteds.isEmpty()) {
+				try {
+					XMLObjectSupport.marshall(response);
+				}
+				catch (final MarshallingException ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+		}
+
+		private void decryptAssertion(Assertion assertion) {
+			for (AttributeStatement statement : assertion.getAttributeStatements()) {
+				decryptAttributes(statement);
+			}
+			decryptSubject(assertion.getSubject());
+			if (assertion.getConditions() != null) {
+				for (Condition c : assertion.getConditions().getConditions()) {
+					if (!(c instanceof DelegationRestrictionType delegation)) {
+						continue;
+					}
+					for (Delegate d : delegation.getDelegates()) {
+						if (d.getEncryptedID() != null) {
+							try {
+								NameID decrypted = (NameID) this.decrypter.decrypt(d.getEncryptedID());
+								if (decrypted != null) {
+									d.setNameID(decrypted);
+									d.setEncryptedID(null);
+								}
+							}
+							catch (DecryptionException ex) {
+								throw new Saml2Exception(ex);
+							}
+						}
+					}
+				}
+			}
+		}
+
+		private void decryptAttributes(AttributeStatement statement) {
+			Collection<Attribute> decrypteds = new ArrayList<>();
+			Collection<EncryptedAttribute> encrypteds = new ArrayList<>();
+			for (EncryptedAttribute encrypted : statement.getEncryptedAttributes()) {
+				try {
+					Attribute decrypted = this.decrypter.decrypt(encrypted);
+					if (decrypted != null) {
+						encrypteds.add(encrypted);
+						decrypteds.add(decrypted);
+					}
+				}
+				catch (Exception ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+			statement.getEncryptedAttributes().removeAll(encrypteds);
+			statement.getAttributes().addAll(decrypteds);
+		}
+
+		private void decryptSubject(Subject subject) {
+			if (subject != null) {
+				if (subject.getEncryptedID() != null) {
+					try {
+						NameID decrypted = (NameID) this.decrypter.decrypt(subject.getEncryptedID());
+						if (decrypted != null) {
+							subject.setNameID(decrypted);
+							subject.setEncryptedID(null);
+						}
+					}
+					catch (final DecryptionException ex) {
+						throw new Saml2Exception(ex);
+					}
+				}
+
+				for (final SubjectConfirmation sc : subject.getSubjectConfirmations()) {
+					if (sc.getEncryptedID() != null) {
+						try {
+							NameID decrypted = (NameID) this.decrypter.decrypt(sc.getEncryptedID());
+							if (decrypted != null) {
+								sc.setNameID(decrypted);
+								sc.setEncryptedID(null);
+							}
+						}
+						catch (final DecryptionException ex) {
+							throw new Saml2Exception(ex);
+						}
+					}
+				}
+			}
+		}
+
+		private void decryptLogoutRequest(LogoutRequest request) {
+			if (request.getEncryptedID() != null) {
+				try {
+					NameID decrypted = (NameID) this.decrypter.decrypt(request.getEncryptedID());
+					if (decrypted != null) {
+						request.setNameID(decrypted);
+						request.setEncryptedID(null);
+					}
+				}
+				catch (DecryptionException ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+		}
+
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Main/java/org/springframework/security/saml2/provider/service/web/authentication/OpenSaml5AuthenticationRequestResolver.java

@@ -0,0 +1,144 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.web.authentication;
+
+import java.time.Clock;
+import java.time.Instant;
+import java.util.function.Consumer;
+
+import jakarta.servlet.http.HttpServletRequest;
+import org.opensaml.saml.saml2.core.AuthnRequest;
+
+import org.springframework.core.convert.converter.Converter;
+import org.springframework.security.saml2.provider.service.authentication.AbstractSaml2AuthenticationRequest;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistration;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistrationRepository;
+import org.springframework.security.saml2.provider.service.web.RelyingPartyRegistrationResolver;
+import org.springframework.security.web.util.matcher.RequestMatcher;
+import org.springframework.util.Assert;
+
+/**
+ * A strategy for resolving a SAML 2.0 Authentication Request from the
+ * {@link HttpServletRequest} using OpenSAML.
+ *
+ * @author Josh Cummings
+ * @since 5.7
+ */
+public final class OpenSaml5AuthenticationRequestResolver implements Saml2AuthenticationRequestResolver {
+
+	private final BaseOpenSamlAuthenticationRequestResolver delegate;
+
+	/**
+	 * Construct an {@link OpenSaml5AuthenticationRequestResolver}
+	 * @param registrations a repository for relying and asserting party configuration
+	 * @since 6.1
+	 */
+	public OpenSaml5AuthenticationRequestResolver(RelyingPartyRegistrationRepository registrations) {
+		this.delegate = new BaseOpenSamlAuthenticationRequestResolver((request, id) -> {
+			if (id == null) {
+				return null;
+			}
+			return registrations.findByRegistrationId(id);
+		}, new OpenSaml5Template());
+	}
+
+	/**
+	 * Construct a {@link OpenSaml5AuthenticationRequestResolver}
+	 */
+	public OpenSaml5AuthenticationRequestResolver(RelyingPartyRegistrationResolver relyingPartyRegistrationResolver) {
+		this.delegate = new BaseOpenSamlAuthenticationRequestResolver(relyingPartyRegistrationResolver,
+				new OpenSaml5Template());
+	}
+
+	@Override
+	public <T extends AbstractSaml2AuthenticationRequest> T resolve(HttpServletRequest request) {
+		return this.delegate.resolve(request);
+	}
+
+	/**
+	 * Set a {@link Consumer} for modifying the OpenSAML {@link AuthnRequest}
+	 * @param contextConsumer a consumer that accepts an {@link AuthnRequestContext}
+	 */
+	public void setAuthnRequestCustomizer(Consumer<AuthnRequestContext> contextConsumer) {
+		Assert.notNull(contextConsumer, "contextConsumer cannot be null");
+		this.delegate.setParametersConsumer(
+				(parameters) -> contextConsumer.accept(new AuthnRequestContext(parameters.getRequest(),
+						parameters.getRelyingPartyRegistration(), parameters.getAuthnRequest())));
+	}
+
+	/**
+	 * Set the {@link RequestMatcher} to use for setting the
+	 * {@link BaseOpenSamlAuthenticationRequestResolver#setRequestMatcher(RequestMatcher)}
+	 * (RequestMatcher)}
+	 * @param requestMatcher the {@link RequestMatcher} to identify authentication
+	 * requests.
+	 * @since 5.8
+	 */
+	public void setRequestMatcher(RequestMatcher requestMatcher) {
+		Assert.notNull(requestMatcher, "requestMatcher cannot be null");
+		this.delegate.setRequestMatcher(requestMatcher);
+	}
+
+	/**
+	 * Use this {@link Clock} for generating the issued {@link Instant}
+	 * @param clock the {@link Clock} to use
+	 */
+	public void setClock(Clock clock) {
+		Assert.notNull(clock, "clock must not be null");
+		this.delegate.setClock(clock);
+	}
+
+	/**
+	 * Use this {@link Converter} to compute the RelayState
+	 * @param relayStateResolver the {@link Converter} to use
+	 * @since 5.8
+	 */
+	public void setRelayStateResolver(Converter<HttpServletRequest, String> relayStateResolver) {
+		Assert.notNull(relayStateResolver, "relayStateResolver cannot be null");
+		this.delegate.setRelayStateResolver(relayStateResolver);
+	}
+
+	public static final class AuthnRequestContext {
+
+		private final HttpServletRequest request;
+
+		private final RelyingPartyRegistration registration;
+
+		private final AuthnRequest authnRequest;
+
+		public AuthnRequestContext(HttpServletRequest request, RelyingPartyRegistration registration,
+				AuthnRequest authnRequest) {
+			this.request = request;
+			this.registration = registration;
+			this.authnRequest = authnRequest;
+		}
+
+		public HttpServletRequest getRequest() {
+			return this.request;
+		}
+
+		public RelyingPartyRegistration getRelyingPartyRegistration() {
+			return this.registration;
+		}
+
+		public AuthnRequest getAuthnRequest() {
+			return this.authnRequest;
+		}
+
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Main/java/org/springframework/security/saml2/provider/service/web/authentication/OpenSaml5Template.java

@@ -0,0 +1,617 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.web.authentication;
+
+import java.io.ByteArrayInputStream;
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
+import java.security.PrivateKey;
+import java.security.cert.X509Certificate;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import javax.xml.namespace.QName;
+
+import net.shibboleth.shared.resolver.CriteriaSet;
+import net.shibboleth.shared.xml.SerializeSupport;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.opensaml.core.criterion.EntityIdCriterion;
+import org.opensaml.core.xml.XMLObject;
+import org.opensaml.core.xml.XMLObjectBuilder;
+import org.opensaml.core.xml.config.XMLObjectProviderRegistrySupport;
+import org.opensaml.core.xml.io.Marshaller;
+import org.opensaml.core.xml.io.MarshallingException;
+import org.opensaml.core.xml.io.Unmarshaller;
+import org.opensaml.core.xml.io.UnmarshallerFactory;
+import org.opensaml.core.xml.util.XMLObjectSupport;
+import org.opensaml.saml.common.xml.SAMLConstants;
+import org.opensaml.saml.criterion.ProtocolCriterion;
+import org.opensaml.saml.ext.saml2delrestrict.Delegate;
+import org.opensaml.saml.ext.saml2delrestrict.DelegationRestrictionType;
+import org.opensaml.saml.metadata.criteria.role.impl.EvaluableProtocolRoleDescriptorCriterion;
+import org.opensaml.saml.saml2.core.Assertion;
+import org.opensaml.saml.saml2.core.Attribute;
+import org.opensaml.saml.saml2.core.AttributeStatement;
+import org.opensaml.saml.saml2.core.Condition;
+import org.opensaml.saml.saml2.core.EncryptedAssertion;
+import org.opensaml.saml.saml2.core.EncryptedAttribute;
+import org.opensaml.saml.saml2.core.Issuer;
+import org.opensaml.saml.saml2.core.LogoutRequest;
+import org.opensaml.saml.saml2.core.NameID;
+import org.opensaml.saml.saml2.core.RequestAbstractType;
+import org.opensaml.saml.saml2.core.Response;
+import org.opensaml.saml.saml2.core.StatusResponseType;
+import org.opensaml.saml.saml2.core.Subject;
+import org.opensaml.saml.saml2.core.SubjectConfirmation;
+import org.opensaml.saml.saml2.encryption.Decrypter;
+import org.opensaml.saml.saml2.encryption.EncryptedElementTypeEncryptedKeyResolver;
+import org.opensaml.saml.security.impl.SAMLMetadataSignatureSigningParametersResolver;
+import org.opensaml.saml.security.impl.SAMLSignatureProfileValidator;
+import org.opensaml.security.SecurityException;
+import org.opensaml.security.credential.BasicCredential;
+import org.opensaml.security.credential.Credential;
+import org.opensaml.security.credential.CredentialResolver;
+import org.opensaml.security.credential.CredentialSupport;
+import org.opensaml.security.credential.UsageType;
+import org.opensaml.security.credential.criteria.impl.EvaluableEntityIDCredentialCriterion;
+import org.opensaml.security.credential.criteria.impl.EvaluableUsageCredentialCriterion;
+import org.opensaml.security.credential.impl.CollectionCredentialResolver;
+import org.opensaml.security.criteria.UsageCriterion;
+import org.opensaml.security.x509.BasicX509Credential;
+import org.opensaml.xmlsec.SignatureSigningParameters;
+import org.opensaml.xmlsec.SignatureSigningParametersResolver;
+import org.opensaml.xmlsec.config.impl.DefaultSecurityConfigurationBootstrap;
+import org.opensaml.xmlsec.criterion.SignatureSigningConfigurationCriterion;
+import org.opensaml.xmlsec.crypto.XMLSigningUtil;
+import org.opensaml.xmlsec.encryption.support.ChainingEncryptedKeyResolver;
+import org.opensaml.xmlsec.encryption.support.DecryptionException;
+import org.opensaml.xmlsec.encryption.support.EncryptedKeyResolver;
+import org.opensaml.xmlsec.encryption.support.InlineEncryptedKeyResolver;
+import org.opensaml.xmlsec.encryption.support.SimpleRetrievalMethodEncryptedKeyResolver;
+import org.opensaml.xmlsec.impl.BasicSignatureSigningConfiguration;
+import org.opensaml.xmlsec.keyinfo.KeyInfoCredentialResolver;
+import org.opensaml.xmlsec.keyinfo.KeyInfoGeneratorManager;
+import org.opensaml.xmlsec.keyinfo.NamedKeyInfoGeneratorManager;
+import org.opensaml.xmlsec.keyinfo.impl.CollectionKeyInfoCredentialResolver;
+import org.opensaml.xmlsec.keyinfo.impl.X509KeyInfoGeneratorFactory;
+import org.opensaml.xmlsec.signature.SignableXMLObject;
+import org.opensaml.xmlsec.signature.Signature;
+import org.opensaml.xmlsec.signature.support.SignatureConstants;
+import org.opensaml.xmlsec.signature.support.SignatureSupport;
+import org.opensaml.xmlsec.signature.support.SignatureTrustEngine;
+import org.opensaml.xmlsec.signature.support.impl.ExplicitKeySignatureTrustEngine;
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+
+import org.springframework.security.saml2.Saml2Exception;
+import org.springframework.security.saml2.core.Saml2Error;
+import org.springframework.security.saml2.core.Saml2ErrorCodes;
+import org.springframework.security.saml2.core.Saml2ParameterNames;
+import org.springframework.security.saml2.core.Saml2X509Credential;
+import org.springframework.util.Assert;
+import org.springframework.web.util.UriComponentsBuilder;
+import org.springframework.web.util.UriUtils;
+
+/**
+ * For internal use only. Subject to breaking changes at any time.
+ */
+final class OpenSaml5Template implements OpenSamlOperations {
+
+	private static final Log logger = LogFactory.getLog(OpenSaml5Template.class);
+
+	@Override
+	public <T extends XMLObject> T build(QName elementName) {
+		XMLObjectBuilder<?> builder = XMLObjectProviderRegistrySupport.getBuilderFactory().getBuilder(elementName);
+		if (builder == null) {
+			throw new Saml2Exception("Unable to resolve Builder for " + elementName);
+		}
+		return (T) builder.buildObject(elementName);
+	}
+
+	@Override
+	public <T extends XMLObject> T deserialize(String serialized) {
+		return deserialize(new ByteArrayInputStream(serialized.getBytes(StandardCharsets.UTF_8)));
+	}
+
+	@Override
+	public <T extends XMLObject> T deserialize(InputStream serialized) {
+		try {
+			Document document = XMLObjectProviderRegistrySupport.getParserPool().parse(serialized);
+			Element element = document.getDocumentElement();
+			UnmarshallerFactory factory = XMLObjectProviderRegistrySupport.getUnmarshallerFactory();
+			Unmarshaller unmarshaller = factory.getUnmarshaller(element);
+			if (unmarshaller == null) {
+				throw new Saml2Exception("Unsupported element of type " + element.getTagName());
+			}
+			return (T) unmarshaller.unmarshall(element);
+		}
+		catch (Saml2Exception ex) {
+			throw ex;
+		}
+		catch (Exception ex) {
+			throw new Saml2Exception("Failed to deserialize payload", ex);
+		}
+	}
+
+	@Override
+	public OpenSaml5SerializationConfigurer serialize(XMLObject object) {
+		Marshaller marshaller = XMLObjectProviderRegistrySupport.getMarshallerFactory().getMarshaller(object);
+		try {
+			return serialize(marshaller.marshall(object));
+		}
+		catch (MarshallingException ex) {
+			throw new Saml2Exception(ex);
+		}
+	}
+
+	@Override
+	public OpenSaml5SerializationConfigurer serialize(Element element) {
+		return new OpenSaml5SerializationConfigurer(element);
+	}
+
+	@Override
+	public OpenSaml5SignatureConfigurer withSigningKeys(Collection<Saml2X509Credential> credentials) {
+		return new OpenSaml5SignatureConfigurer(credentials);
+	}
+
+	@Override
+	public OpenSaml5VerificationConfigurer withVerificationKeys(Collection<Saml2X509Credential> credentials) {
+		return new OpenSaml5VerificationConfigurer(credentials);
+	}
+
+	@Override
+	public OpenSaml5DecryptionConfigurer withDecryptionKeys(Collection<Saml2X509Credential> credentials) {
+		return new OpenSaml5DecryptionConfigurer(credentials);
+	}
+
+	OpenSaml5Template() {
+
+	}
+
+	static final class OpenSaml5SerializationConfigurer
+			implements SerializationConfigurer<OpenSaml5SerializationConfigurer> {
+
+		private final Element element;
+
+		boolean pretty;
+
+		OpenSaml5SerializationConfigurer(Element element) {
+			this.element = element;
+		}
+
+		@Override
+		public OpenSaml5SerializationConfigurer prettyPrint(boolean pretty) {
+			this.pretty = pretty;
+			return this;
+		}
+
+		@Override
+		public String serialize() {
+			if (this.pretty) {
+				return SerializeSupport.prettyPrintXML(this.element);
+			}
+			return SerializeSupport.nodeToString(this.element);
+		}
+
+	}
+
+	static final class OpenSaml5SignatureConfigurer implements SignatureConfigurer<OpenSaml5SignatureConfigurer> {
+
+		private final Collection<Saml2X509Credential> credentials;
+
+		private final Map<String, String> components = new LinkedHashMap<>();
+
+		private List<String> algs = List.of(SignatureConstants.ALGO_ID_SIGNATURE_RSA_SHA256);
+
+		OpenSaml5SignatureConfigurer(Collection<Saml2X509Credential> credentials) {
+			this.credentials = credentials;
+		}
+
+		@Override
+		public OpenSaml5SignatureConfigurer algorithms(List<String> algs) {
+			this.algs = algs;
+			return this;
+		}
+
+		@Override
+		public <O extends SignableXMLObject> O sign(O object) {
+			SignatureSigningParameters parameters = resolveSigningParameters();
+			try {
+				SignatureSupport.signObject(object, parameters);
+			}
+			catch (Exception ex) {
+				throw new Saml2Exception(ex);
+			}
+			return object;
+		}
+
+		@Override
+		public Map<String, String> sign(Map<String, String> params) {
+			SignatureSigningParameters parameters = resolveSigningParameters();
+			this.components.putAll(params);
+			Credential credential = parameters.getSigningCredential();
+			String algorithmUri = parameters.getSignatureAlgorithm();
+			this.components.put(Saml2ParameterNames.SIG_ALG, algorithmUri);
+			UriComponentsBuilder builder = UriComponentsBuilder.newInstance();
+			for (Map.Entry<String, String> component : this.components.entrySet()) {
+				builder.queryParam(component.getKey(),
+						UriUtils.encode(component.getValue(), StandardCharsets.ISO_8859_1));
+			}
+			String queryString = builder.build(true).toString().substring(1);
+			try {
+				byte[] rawSignature = XMLSigningUtil.signWithURI(credential, algorithmUri,
+						queryString.getBytes(StandardCharsets.UTF_8));
+				String b64Signature = Saml2Utils.samlEncode(rawSignature);
+				this.components.put(Saml2ParameterNames.SIGNATURE, b64Signature);
+			}
+			catch (SecurityException ex) {
+				throw new Saml2Exception(ex);
+			}
+			return this.components;
+		}
+
+		private SignatureSigningParameters resolveSigningParameters() {
+			List<Credential> credentials = resolveSigningCredentials();
+			List<String> digests = Collections.singletonList(SignatureConstants.ALGO_ID_DIGEST_SHA256);
+			String canonicalization = SignatureConstants.ALGO_ID_C14N_EXCL_OMIT_COMMENTS;
+			SignatureSigningParametersResolver resolver = new SAMLMetadataSignatureSigningParametersResolver();
+			BasicSignatureSigningConfiguration signingConfiguration = new BasicSignatureSigningConfiguration();
+			signingConfiguration.setSigningCredentials(credentials);
+			signingConfiguration.setSignatureAlgorithms(this.algs);
+			signingConfiguration.setSignatureReferenceDigestMethods(digests);
+			signingConfiguration.setSignatureCanonicalizationAlgorithm(canonicalization);
+			signingConfiguration.setKeyInfoGeneratorManager(buildSignatureKeyInfoGeneratorManager());
+			CriteriaSet criteria = new CriteriaSet(new SignatureSigningConfigurationCriterion(signingConfiguration));
+			try {
+				SignatureSigningParameters parameters = resolver.resolveSingle(criteria);
+				Assert.notNull(parameters, "Failed to resolve any signing credential");
+				return parameters;
+			}
+			catch (Exception ex) {
+				throw new Saml2Exception(ex);
+			}
+		}
+
+		private NamedKeyInfoGeneratorManager buildSignatureKeyInfoGeneratorManager() {
+			final NamedKeyInfoGeneratorManager namedManager = new NamedKeyInfoGeneratorManager();
+
+			namedManager.setUseDefaultManager(true);
+			final KeyInfoGeneratorManager defaultManager = namedManager.getDefaultManager();
+
+			// Generator for X509Credentials
+			final X509KeyInfoGeneratorFactory x509Factory = new X509KeyInfoGeneratorFactory();
+			x509Factory.setEmitEntityCertificate(true);
+			x509Factory.setEmitEntityCertificateChain(true);
+
+			defaultManager.registerFactory(x509Factory);
+
+			return namedManager;
+		}
+
+		private List<Credential> resolveSigningCredentials() {
+			List<Credential> credentials = new ArrayList<>();
+			for (Saml2X509Credential x509Credential : this.credentials) {
+				X509Certificate certificate = x509Credential.getCertificate();
+				PrivateKey privateKey = x509Credential.getPrivateKey();
+				BasicCredential credential = CredentialSupport.getSimpleCredential(certificate, privateKey);
+				credential.setUsageType(UsageType.SIGNING);
+				credentials.add(credential);
+			}
+			return credentials;
+		}
+
+	}
+
+	static final class OpenSaml5VerificationConfigurer implements VerificationConfigurer {
+
+		private final Collection<Saml2X509Credential> credentials;
+
+		private String entityId;
+
+		OpenSaml5VerificationConfigurer(Collection<Saml2X509Credential> credentials) {
+			this.credentials = credentials;
+		}
+
+		@Override
+		public VerificationConfigurer entityId(String entityId) {
+			this.entityId = entityId;
+			return this;
+		}
+
+		private SignatureTrustEngine trustEngine(Collection<Saml2X509Credential> keys) {
+			Set<Credential> credentials = new HashSet<>();
+			for (Saml2X509Credential key : keys) {
+				BasicX509Credential cred = new BasicX509Credential(key.getCertificate());
+				cred.setUsageType(UsageType.SIGNING);
+				cred.setEntityId(this.entityId);
+				credentials.add(cred);
+			}
+			CredentialResolver credentialsResolver = new CollectionCredentialResolver(credentials);
+			return new ExplicitKeySignatureTrustEngine(credentialsResolver,
+					DefaultSecurityConfigurationBootstrap.buildBasicInlineKeyInfoCredentialResolver());
+		}
+
+		private CriteriaSet verificationCriteria(Issuer issuer) {
+			return new CriteriaSet(new EvaluableEntityIDCredentialCriterion(new EntityIdCriterion(issuer.getValue())),
+					new EvaluableProtocolRoleDescriptorCriterion(new ProtocolCriterion(SAMLConstants.SAML20P_NS)),
+					new EvaluableUsageCredentialCriterion(new UsageCriterion(UsageType.SIGNING)));
+		}
+
+		@Override
+		public Collection<Saml2Error> verify(SignableXMLObject signable) {
+			if (signable instanceof StatusResponseType response) {
+				return verifySignature(response.getID(), response.getIssuer(), response.getSignature());
+			}
+			if (signable instanceof RequestAbstractType request) {
+				return verifySignature(request.getID(), request.getIssuer(), request.getSignature());
+			}
+			if (signable instanceof Assertion assertion) {
+				return verifySignature(assertion.getID(), assertion.getIssuer(), assertion.getSignature());
+			}
+			throw new Saml2Exception("Unsupported object of type: " + signable.getClass().getName());
+		}
+
+		private Collection<Saml2Error> verifySignature(String id, Issuer issuer, Signature signature) {
+			SignatureTrustEngine trustEngine = trustEngine(this.credentials);
+			CriteriaSet criteria = verificationCriteria(issuer);
+			Collection<Saml2Error> errors = new ArrayList<>();
+			SAMLSignatureProfileValidator profileValidator = new SAMLSignatureProfileValidator();
+			try {
+				profileValidator.validate(signature);
+			}
+			catch (Exception ex) {
+				errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Invalid signature for object [" + id + "]: "));
+			}
+
+			try {
+				if (!trustEngine.validate(signature, criteria)) {
+					errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+							"Invalid signature for object [" + id + "]"));
+				}
+			}
+			catch (Exception ex) {
+				errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Invalid signature for object [" + id + "]: "));
+			}
+
+			return errors;
+		}
+
+		@Override
+		public Collection<Saml2Error> verify(RedirectParameters parameters) {
+			SignatureTrustEngine trustEngine = trustEngine(this.credentials);
+			CriteriaSet criteria = verificationCriteria(parameters.getIssuer());
+			if (parameters.getAlgorithm() == null) {
+				return Collections.singletonList(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Missing signature algorithm for object [" + parameters.getId() + "]"));
+			}
+			if (!parameters.hasSignature()) {
+				return Collections.singletonList(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Missing signature for object [" + parameters.getId() + "]"));
+			}
+			Collection<Saml2Error> errors = new ArrayList<>();
+			String algorithmUri = parameters.getAlgorithm();
+			try {
+				if (!trustEngine.validate(parameters.getSignature(), parameters.getContent(), algorithmUri, criteria,
+						null)) {
+					errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+							"Invalid signature for object [" + parameters.getId() + "]"));
+				}
+			}
+			catch (Exception ex) {
+				errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Invalid signature for object [" + parameters.getId() + "]: "));
+			}
+			return errors;
+		}
+
+	}
+
+	static final class OpenSaml5DecryptionConfigurer implements DecryptionConfigurer {
+
+		private static final EncryptedKeyResolver encryptedKeyResolver = new ChainingEncryptedKeyResolver(
+				Arrays.asList(new InlineEncryptedKeyResolver(), new EncryptedElementTypeEncryptedKeyResolver(),
+						new SimpleRetrievalMethodEncryptedKeyResolver()));
+
+		private final Decrypter decrypter;
+
+		OpenSaml5DecryptionConfigurer(Collection<Saml2X509Credential> decryptionCredentials) {
+			this.decrypter = decrypter(decryptionCredentials);
+		}
+
+		private static Decrypter decrypter(Collection<Saml2X509Credential> decryptionCredentials) {
+			Collection<Credential> credentials = new ArrayList<>();
+			for (Saml2X509Credential key : decryptionCredentials) {
+				Credential cred = CredentialSupport.getSimpleCredential(key.getCertificate(), key.getPrivateKey());
+				credentials.add(cred);
+			}
+			KeyInfoCredentialResolver resolver = new CollectionKeyInfoCredentialResolver(credentials);
+			Decrypter decrypter = new Decrypter(null, resolver, encryptedKeyResolver);
+			decrypter.setRootInNewDocument(true);
+			return decrypter;
+		}
+
+		@Override
+		public void decrypt(XMLObject object) {
+			if (object instanceof Response response) {
+				decryptResponse(response);
+				return;
+			}
+			if (object instanceof Assertion assertion) {
+				decryptAssertion(assertion);
+			}
+			if (object instanceof LogoutRequest request) {
+				decryptLogoutRequest(request);
+			}
+		}
+
+		/*
+		 * The methods that follow are adapted from OpenSAML's {@link DecryptAssertions},
+		 * {@link DecryptNameIDs}, and {@link DecryptAttributes}.
+		 *
+		 * <p>The reason that these OpenSAML classes are not used directly is because they
+		 * reference {@link javax.servlet.http.HttpServletRequest} which is a lower
+		 * Servlet API version than what Spring Security SAML uses.
+		 *
+		 * If OpenSAML 5 updates to {@link jakarta.servlet.http.HttpServletRequest}, then
+		 * this arrangement can be revisited.
+		 */
+
+		private void decryptResponse(Response response) {
+			Collection<Assertion> decrypteds = new ArrayList<>();
+			Collection<EncryptedAssertion> encrypteds = new ArrayList<>();
+
+			int count = 0;
+			int size = response.getEncryptedAssertions().size();
+			for (EncryptedAssertion encrypted : response.getEncryptedAssertions()) {
+				logger.trace(String.format("Decrypting EncryptedAssertion (%d/%d) in Response [%s]", count, size,
+						response.getID()));
+				try {
+					Assertion decrypted = this.decrypter.decrypt(encrypted);
+					if (decrypted != null) {
+						encrypteds.add(encrypted);
+						decrypteds.add(decrypted);
+					}
+					count++;
+				}
+				catch (DecryptionException ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+
+			response.getEncryptedAssertions().removeAll(encrypteds);
+			response.getAssertions().addAll(decrypteds);
+
+			// Re-marshall the response so that any ID attributes within the decrypted
+			// Assertions
+			// will have their ID-ness re-established at the DOM level.
+			if (!decrypteds.isEmpty()) {
+				try {
+					XMLObjectSupport.marshall(response);
+				}
+				catch (final MarshallingException ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+		}
+
+		private void decryptAssertion(Assertion assertion) {
+			for (AttributeStatement statement : assertion.getAttributeStatements()) {
+				decryptAttributes(statement);
+			}
+			decryptSubject(assertion.getSubject());
+			if (assertion.getConditions() != null) {
+				for (Condition c : assertion.getConditions().getConditions()) {
+					if (!(c instanceof DelegationRestrictionType delegation)) {
+						continue;
+					}
+					for (Delegate d : delegation.getDelegates()) {
+						if (d.getEncryptedID() != null) {
+							try {
+								NameID decrypted = (NameID) this.decrypter.decrypt(d.getEncryptedID());
+								if (decrypted != null) {
+									d.setNameID(decrypted);
+									d.setEncryptedID(null);
+								}
+							}
+							catch (DecryptionException ex) {
+								throw new Saml2Exception(ex);
+							}
+						}
+					}
+				}
+			}
+		}
+
+		private void decryptAttributes(AttributeStatement statement) {
+			Collection<Attribute> decrypteds = new ArrayList<>();
+			Collection<EncryptedAttribute> encrypteds = new ArrayList<>();
+			for (EncryptedAttribute encrypted : statement.getEncryptedAttributes()) {
+				try {
+					Attribute decrypted = this.decrypter.decrypt(encrypted);
+					if (decrypted != null) {
+						encrypteds.add(encrypted);
+						decrypteds.add(decrypted);
+					}
+				}
+				catch (Exception ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+			statement.getEncryptedAttributes().removeAll(encrypteds);
+			statement.getAttributes().addAll(decrypteds);
+		}
+
+		private void decryptSubject(Subject subject) {
+			if (subject != null) {
+				if (subject.getEncryptedID() != null) {
+					try {
+						NameID decrypted = (NameID) this.decrypter.decrypt(subject.getEncryptedID());
+						if (decrypted != null) {
+							subject.setNameID(decrypted);
+							subject.setEncryptedID(null);
+						}
+					}
+					catch (final DecryptionException ex) {
+						throw new Saml2Exception(ex);
+					}
+				}
+
+				for (final SubjectConfirmation sc : subject.getSubjectConfirmations()) {
+					if (sc.getEncryptedID() != null) {
+						try {
+							NameID decrypted = (NameID) this.decrypter.decrypt(sc.getEncryptedID());
+							if (decrypted != null) {
+								sc.setNameID(decrypted);
+								sc.setEncryptedID(null);
+							}
+						}
+						catch (final DecryptionException ex) {
+							throw new Saml2Exception(ex);
+						}
+					}
+				}
+			}
+		}
+
+		private void decryptLogoutRequest(LogoutRequest request) {
+			if (request.getEncryptedID() != null) {
+				try {
+					NameID decrypted = (NameID) this.decrypter.decrypt(request.getEncryptedID());
+					if (decrypted != null) {
+						request.setNameID(decrypted);
+						request.setEncryptedID(null);
+					}
+				}
+				catch (DecryptionException ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+		}
+
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Main/java/org/springframework/security/saml2/provider/service/web/authentication/logout/OpenSaml5LogoutRequestResolver.java

@@ -0,0 +1,142 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.web.authentication.logout;
+
+import java.time.Clock;
+import java.time.Instant;
+import java.util.function.Consumer;
+
+import jakarta.servlet.http.HttpServletRequest;
+import org.opensaml.saml.saml2.core.LogoutRequest;
+
+import org.springframework.core.convert.converter.Converter;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.saml2.provider.service.authentication.logout.Saml2LogoutRequest;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistration;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistrationRepository;
+import org.springframework.security.saml2.provider.service.web.RelyingPartyRegistrationResolver;
+import org.springframework.util.Assert;
+
+/**
+ * A {@link Saml2LogoutRequestResolver} for resolving SAML 2.0 Logout Requests with
+ * OpenSAML 4
+ *
+ * @author Josh Cummings
+ * @author Gerhard Haege
+ * @since 5.6
+ */
+public final class OpenSaml5LogoutRequestResolver implements Saml2LogoutRequestResolver {
+
+	private final BaseOpenSamlLogoutRequestResolver delegate;
+
+	public OpenSaml5LogoutRequestResolver(RelyingPartyRegistrationRepository registrations) {
+		this((request, id) -> {
+			if (id == null) {
+				return null;
+			}
+			return registrations.findByRegistrationId(id);
+		});
+	}
+
+	/**
+	 * Construct a {@link OpenSaml5LogoutRequestResolver}
+	 */
+	public OpenSaml5LogoutRequestResolver(RelyingPartyRegistrationResolver relyingPartyRegistrationResolver) {
+		this.delegate = new BaseOpenSamlLogoutRequestResolver(relyingPartyRegistrationResolver,
+				new OpenSaml5Template());
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public Saml2LogoutRequest resolve(HttpServletRequest request, Authentication authentication) {
+		return this.delegate.resolve(request, authentication);
+	}
+
+	/**
+	 * Set a {@link Consumer} for modifying the OpenSAML {@link LogoutRequest}
+	 * @param parametersConsumer a consumer that accepts an
+	 * {@link LogoutRequestParameters}
+	 */
+	public void setParametersConsumer(Consumer<LogoutRequestParameters> parametersConsumer) {
+		Assert.notNull(parametersConsumer, "parametersConsumer cannot be null");
+		this.delegate
+			.setParametersConsumer((parameters) -> parametersConsumer.accept(new LogoutRequestParameters(parameters)));
+	}
+
+	/**
+	 * Use this {@link Clock} for determining the issued {@link Instant}
+	 * @param clock the {@link Clock} to use
+	 */
+	public void setClock(Clock clock) {
+		Assert.notNull(clock, "clock must not be null");
+		this.delegate.setClock(clock);
+	}
+
+	/**
+	 * Use this {@link Converter} to compute the RelayState
+	 * @param relayStateResolver the {@link Converter} to use
+	 * @since 6.1
+	 */
+	public void setRelayStateResolver(Converter<HttpServletRequest, String> relayStateResolver) {
+		Assert.notNull(relayStateResolver, "relayStateResolver cannot be null");
+		this.delegate.setRelayStateResolver(relayStateResolver);
+	}
+
+	public static final class LogoutRequestParameters {
+
+		private final HttpServletRequest request;
+
+		private final RelyingPartyRegistration registration;
+
+		private final Authentication authentication;
+
+		private final LogoutRequest logoutRequest;
+
+		public LogoutRequestParameters(HttpServletRequest request, RelyingPartyRegistration registration,
+				Authentication authentication, LogoutRequest logoutRequest) {
+			this.request = request;
+			this.registration = registration;
+			this.authentication = authentication;
+			this.logoutRequest = logoutRequest;
+		}
+
+		LogoutRequestParameters(BaseOpenSamlLogoutRequestResolver.LogoutRequestParameters parameters) {
+			this(parameters.getRequest(), parameters.getRelyingPartyRegistration(), parameters.getAuthentication(),
+					parameters.getLogoutRequest());
+		}
+
+		public HttpServletRequest getRequest() {
+			return this.request;
+		}
+
+		public RelyingPartyRegistration getRelyingPartyRegistration() {
+			return this.registration;
+		}
+
+		public Authentication getAuthentication() {
+			return this.authentication;
+		}
+
+		public LogoutRequest getLogoutRequest() {
+			return this.logoutRequest;
+		}
+
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Main/java/org/springframework/security/saml2/provider/service/web/authentication/logout/OpenSaml5LogoutRequestValidatorParametersResolver.java

@@ -0,0 +1,100 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.web.authentication.logout;
+
+import jakarta.servlet.http.HttpServletRequest;
+
+import org.springframework.security.core.Authentication;
+import org.springframework.security.saml2.core.OpenSamlInitializationService;
+import org.springframework.security.saml2.provider.service.authentication.Saml2AuthenticationException;
+import org.springframework.security.saml2.provider.service.authentication.logout.Saml2LogoutRequestValidatorParameters;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistration;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistrationRepository;
+import org.springframework.security.web.util.matcher.RequestMatcher;
+import org.springframework.util.Assert;
+
+/**
+ * An OpenSAML-based implementation of
+ * {@link Saml2LogoutRequestValidatorParametersResolver}
+ */
+public final class OpenSaml5LogoutRequestValidatorParametersResolver
+		implements Saml2LogoutRequestValidatorParametersResolver {
+
+	static {
+		OpenSamlInitializationService.initialize();
+	}
+
+	private final BaseOpenSamlLogoutRequestValidatorParametersResolver delegate;
+
+	/**
+	 * Constructs a {@link OpenSaml5LogoutRequestValidatorParametersResolver}
+	 */
+	public OpenSaml5LogoutRequestValidatorParametersResolver(RelyingPartyRegistrationRepository registrations) {
+		Assert.notNull(registrations, "relyingPartyRegistrationRepository cannot be null");
+		this.delegate = new BaseOpenSamlLogoutRequestValidatorParametersResolver(new OpenSaml5Template(),
+				registrations);
+	}
+
+	/**
+	 * Construct the parameters necessary for validating an asserting party's
+	 * {@code <saml2:LogoutRequest>} based on the given {@link HttpServletRequest}
+	 *
+	 * <p>
+	 * Uses the configured {@link RequestMatcher} to identify the processing request,
+	 * including looking for any indicated {@code registrationId}.
+	 *
+	 * <p>
+	 * If a {@code registrationId} is found in the request, it will attempt to use that,
+	 * erroring if no {@link RelyingPartyRegistration} is found.
+	 *
+	 * <p>
+	 * If no {@code registrationId} is found in the request, it will look for a currently
+	 * logged-in user and use the associated {@code registrationId}.
+	 *
+	 * <p>
+	 * In the event that neither the URL nor any logged in user could determine a
+	 * {@code registrationId}, this code then will try and derive a
+	 * {@link RelyingPartyRegistration} given the {@code <saml2:LogoutRequest>}'s
+	 * {@code Issuer} value.
+	 * @param request the HTTP request
+	 * @return a {@link Saml2LogoutRequestValidatorParameters} instance, or {@code null}
+	 * if one could not be resolved
+	 * @throws Saml2AuthenticationException if the {@link RequestMatcher} specifies a
+	 * non-existent {@code registrationId}
+	 */
+	@Override
+	public Saml2LogoutRequestValidatorParameters resolve(HttpServletRequest request, Authentication authentication) {
+		return this.delegate.resolve(request, authentication);
+	}
+
+	/**
+	 * The request matcher to use to identify a request to process a
+	 * {@code <saml2:LogoutRequest>}. By default, checks for {@code /logout/saml2/slo} and
+	 * {@code /logout/saml2/slo/{registrationId}}.
+	 *
+	 * <p>
+	 * Generally speaking, the URL does not need to have a {@code registrationId} in it
+	 * since either it can be looked up from the active logged in user or it can be
+	 * derived through the {@code Issuer} in the {@code <saml2:LogoutRequest>}.
+	 * @param requestMatcher the {@link RequestMatcher} to use
+	 */
+	public void setRequestMatcher(RequestMatcher requestMatcher) {
+		Assert.notNull(requestMatcher, "requestMatcher cannot be null");
+		this.delegate.setRequestMatcher(requestMatcher);
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Main/java/org/springframework/security/saml2/provider/service/web/authentication/logout/OpenSaml5LogoutResponseResolver.java

@@ -0,0 +1,130 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.web.authentication.logout;
+
+import java.time.Clock;
+import java.time.Instant;
+import java.util.function.Consumer;
+
+import jakarta.servlet.http.HttpServletRequest;
+import org.opensaml.saml.saml2.core.LogoutRequest;
+
+import org.springframework.security.core.Authentication;
+import org.springframework.security.saml2.provider.service.authentication.logout.Saml2LogoutResponse;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistration;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistrationRepository;
+import org.springframework.security.saml2.provider.service.web.RelyingPartyRegistrationResolver;
+import org.springframework.util.Assert;
+
+/**
+ * A {@link Saml2LogoutResponseResolver} for resolving SAML 2.0 Logout Responses with
+ * OpenSAML 4
+ *
+ * @author Josh Cummings
+ * @since 5.6
+ */
+public final class OpenSaml5LogoutResponseResolver implements Saml2LogoutResponseResolver {
+
+	private final BaseOpenSamlLogoutResponseResolver delegate;
+
+	public OpenSaml5LogoutResponseResolver(RelyingPartyRegistrationRepository registrations) {
+		this.delegate = new BaseOpenSamlLogoutResponseResolver(registrations, (request, id) -> {
+			if (id == null) {
+				return null;
+			}
+			return registrations.findByRegistrationId(id);
+		}, new OpenSaml5Template());
+	}
+
+	/**
+	 * Construct a {@link OpenSaml5LogoutResponseResolver}
+	 */
+	public OpenSaml5LogoutResponseResolver(RelyingPartyRegistrationResolver relyingPartyRegistrationResolver) {
+		this.delegate = new BaseOpenSamlLogoutResponseResolver(null, relyingPartyRegistrationResolver,
+				new OpenSaml5Template());
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public Saml2LogoutResponse resolve(HttpServletRequest request, Authentication authentication) {
+		return this.delegate.resolve(request, authentication);
+	}
+
+	/**
+	 * Set a {@link Consumer} for modifying the OpenSAML {@link LogoutRequest}
+	 * @param parametersConsumer a consumer that accepts an
+	 * {@link OpenSaml5LogoutRequestResolver.LogoutRequestParameters}
+	 */
+	public void setParametersConsumer(Consumer<LogoutResponseParameters> parametersConsumer) {
+		Assert.notNull(parametersConsumer, "parametersConsumer cannot be null");
+		this.delegate
+			.setParametersConsumer((parameters) -> parametersConsumer.accept(new LogoutResponseParameters(parameters)));
+	}
+
+	/**
+	 * Use this {@link Clock} for determining the issued {@link Instant}
+	 * @param clock the {@link Clock} to use
+	 */
+	public void setClock(Clock clock) {
+		Assert.notNull(clock, "clock must not be null");
+		this.delegate.setClock(clock);
+	}
+
+	public static final class LogoutResponseParameters {
+
+		private final HttpServletRequest request;
+
+		private final RelyingPartyRegistration registration;
+
+		private final Authentication authentication;
+
+		private final LogoutRequest logoutRequest;
+
+		public LogoutResponseParameters(HttpServletRequest request, RelyingPartyRegistration registration,
+				Authentication authentication, LogoutRequest logoutRequest) {
+			this.request = request;
+			this.registration = registration;
+			this.authentication = authentication;
+			this.logoutRequest = logoutRequest;
+		}
+
+		LogoutResponseParameters(BaseOpenSamlLogoutResponseResolver.LogoutResponseParameters parameters) {
+			this(parameters.getRequest(), parameters.getRelyingPartyRegistration(), parameters.getAuthentication(),
+					parameters.getLogoutRequest());
+		}
+
+		public HttpServletRequest getRequest() {
+			return this.request;
+		}
+
+		public RelyingPartyRegistration getRelyingPartyRegistration() {
+			return this.registration;
+		}
+
+		public Authentication getAuthentication() {
+			return this.authentication;
+		}
+
+		public LogoutRequest getLogoutRequest() {
+			return this.logoutRequest;
+		}
+
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Main/java/org/springframework/security/saml2/provider/service/web/authentication/logout/OpenSaml5Template.java

@@ -0,0 +1,617 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.web.authentication.logout;
+
+import java.io.ByteArrayInputStream;
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
+import java.security.PrivateKey;
+import java.security.cert.X509Certificate;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import javax.xml.namespace.QName;
+
+import net.shibboleth.shared.resolver.CriteriaSet;
+import net.shibboleth.shared.xml.SerializeSupport;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.opensaml.core.criterion.EntityIdCriterion;
+import org.opensaml.core.xml.XMLObject;
+import org.opensaml.core.xml.XMLObjectBuilder;
+import org.opensaml.core.xml.config.XMLObjectProviderRegistrySupport;
+import org.opensaml.core.xml.io.Marshaller;
+import org.opensaml.core.xml.io.MarshallingException;
+import org.opensaml.core.xml.io.Unmarshaller;
+import org.opensaml.core.xml.io.UnmarshallerFactory;
+import org.opensaml.core.xml.util.XMLObjectSupport;
+import org.opensaml.saml.common.xml.SAMLConstants;
+import org.opensaml.saml.criterion.ProtocolCriterion;
+import org.opensaml.saml.ext.saml2delrestrict.Delegate;
+import org.opensaml.saml.ext.saml2delrestrict.DelegationRestrictionType;
+import org.opensaml.saml.metadata.criteria.role.impl.EvaluableProtocolRoleDescriptorCriterion;
+import org.opensaml.saml.saml2.core.Assertion;
+import org.opensaml.saml.saml2.core.Attribute;
+import org.opensaml.saml.saml2.core.AttributeStatement;
+import org.opensaml.saml.saml2.core.Condition;
+import org.opensaml.saml.saml2.core.EncryptedAssertion;
+import org.opensaml.saml.saml2.core.EncryptedAttribute;
+import org.opensaml.saml.saml2.core.Issuer;
+import org.opensaml.saml.saml2.core.LogoutRequest;
+import org.opensaml.saml.saml2.core.NameID;
+import org.opensaml.saml.saml2.core.RequestAbstractType;
+import org.opensaml.saml.saml2.core.Response;
+import org.opensaml.saml.saml2.core.StatusResponseType;
+import org.opensaml.saml.saml2.core.Subject;
+import org.opensaml.saml.saml2.core.SubjectConfirmation;
+import org.opensaml.saml.saml2.encryption.Decrypter;
+import org.opensaml.saml.saml2.encryption.EncryptedElementTypeEncryptedKeyResolver;
+import org.opensaml.saml.security.impl.SAMLMetadataSignatureSigningParametersResolver;
+import org.opensaml.saml.security.impl.SAMLSignatureProfileValidator;
+import org.opensaml.security.SecurityException;
+import org.opensaml.security.credential.BasicCredential;
+import org.opensaml.security.credential.Credential;
+import org.opensaml.security.credential.CredentialResolver;
+import org.opensaml.security.credential.CredentialSupport;
+import org.opensaml.security.credential.UsageType;
+import org.opensaml.security.credential.criteria.impl.EvaluableEntityIDCredentialCriterion;
+import org.opensaml.security.credential.criteria.impl.EvaluableUsageCredentialCriterion;
+import org.opensaml.security.credential.impl.CollectionCredentialResolver;
+import org.opensaml.security.criteria.UsageCriterion;
+import org.opensaml.security.x509.BasicX509Credential;
+import org.opensaml.xmlsec.SignatureSigningParameters;
+import org.opensaml.xmlsec.SignatureSigningParametersResolver;
+import org.opensaml.xmlsec.config.impl.DefaultSecurityConfigurationBootstrap;
+import org.opensaml.xmlsec.criterion.SignatureSigningConfigurationCriterion;
+import org.opensaml.xmlsec.crypto.XMLSigningUtil;
+import org.opensaml.xmlsec.encryption.support.ChainingEncryptedKeyResolver;
+import org.opensaml.xmlsec.encryption.support.DecryptionException;
+import org.opensaml.xmlsec.encryption.support.EncryptedKeyResolver;
+import org.opensaml.xmlsec.encryption.support.InlineEncryptedKeyResolver;
+import org.opensaml.xmlsec.encryption.support.SimpleRetrievalMethodEncryptedKeyResolver;
+import org.opensaml.xmlsec.impl.BasicSignatureSigningConfiguration;
+import org.opensaml.xmlsec.keyinfo.KeyInfoCredentialResolver;
+import org.opensaml.xmlsec.keyinfo.KeyInfoGeneratorManager;
+import org.opensaml.xmlsec.keyinfo.NamedKeyInfoGeneratorManager;
+import org.opensaml.xmlsec.keyinfo.impl.CollectionKeyInfoCredentialResolver;
+import org.opensaml.xmlsec.keyinfo.impl.X509KeyInfoGeneratorFactory;
+import org.opensaml.xmlsec.signature.SignableXMLObject;
+import org.opensaml.xmlsec.signature.Signature;
+import org.opensaml.xmlsec.signature.support.SignatureConstants;
+import org.opensaml.xmlsec.signature.support.SignatureSupport;
+import org.opensaml.xmlsec.signature.support.SignatureTrustEngine;
+import org.opensaml.xmlsec.signature.support.impl.ExplicitKeySignatureTrustEngine;
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+
+import org.springframework.security.saml2.Saml2Exception;
+import org.springframework.security.saml2.core.Saml2Error;
+import org.springframework.security.saml2.core.Saml2ErrorCodes;
+import org.springframework.security.saml2.core.Saml2ParameterNames;
+import org.springframework.security.saml2.core.Saml2X509Credential;
+import org.springframework.util.Assert;
+import org.springframework.web.util.UriComponentsBuilder;
+import org.springframework.web.util.UriUtils;
+
+/**
+ * For internal use only. Subject to breaking changes at any time.
+ */
+final class OpenSaml5Template implements OpenSamlOperations {
+
+	private static final Log logger = LogFactory.getLog(OpenSaml5Template.class);
+
+	@Override
+	public <T extends XMLObject> T build(QName elementName) {
+		XMLObjectBuilder<?> builder = XMLObjectProviderRegistrySupport.getBuilderFactory().getBuilder(elementName);
+		if (builder == null) {
+			throw new Saml2Exception("Unable to resolve Builder for " + elementName);
+		}
+		return (T) builder.buildObject(elementName);
+	}
+
+	@Override
+	public <T extends XMLObject> T deserialize(String serialized) {
+		return deserialize(new ByteArrayInputStream(serialized.getBytes(StandardCharsets.UTF_8)));
+	}
+
+	@Override
+	public <T extends XMLObject> T deserialize(InputStream serialized) {
+		try {
+			Document document = XMLObjectProviderRegistrySupport.getParserPool().parse(serialized);
+			Element element = document.getDocumentElement();
+			UnmarshallerFactory factory = XMLObjectProviderRegistrySupport.getUnmarshallerFactory();
+			Unmarshaller unmarshaller = factory.getUnmarshaller(element);
+			if (unmarshaller == null) {
+				throw new Saml2Exception("Unsupported element of type " + element.getTagName());
+			}
+			return (T) unmarshaller.unmarshall(element);
+		}
+		catch (Saml2Exception ex) {
+			throw ex;
+		}
+		catch (Exception ex) {
+			throw new Saml2Exception("Failed to deserialize payload", ex);
+		}
+	}
+
+	@Override
+	public OpenSaml5SerializationConfigurer serialize(XMLObject object) {
+		Marshaller marshaller = XMLObjectProviderRegistrySupport.getMarshallerFactory().getMarshaller(object);
+		try {
+			return serialize(marshaller.marshall(object));
+		}
+		catch (MarshallingException ex) {
+			throw new Saml2Exception(ex);
+		}
+	}
+
+	@Override
+	public OpenSaml5SerializationConfigurer serialize(Element element) {
+		return new OpenSaml5SerializationConfigurer(element);
+	}
+
+	@Override
+	public OpenSaml5SignatureConfigurer withSigningKeys(Collection<Saml2X509Credential> credentials) {
+		return new OpenSaml5SignatureConfigurer(credentials);
+	}
+
+	@Override
+	public OpenSaml5VerificationConfigurer withVerificationKeys(Collection<Saml2X509Credential> credentials) {
+		return new OpenSaml5VerificationConfigurer(credentials);
+	}
+
+	@Override
+	public OpenSaml5DecryptionConfigurer withDecryptionKeys(Collection<Saml2X509Credential> credentials) {
+		return new OpenSaml5DecryptionConfigurer(credentials);
+	}
+
+	OpenSaml5Template() {
+
+	}
+
+	static final class OpenSaml5SerializationConfigurer
+			implements SerializationConfigurer<OpenSaml5SerializationConfigurer> {
+
+		private final Element element;
+
+		boolean pretty;
+
+		OpenSaml5SerializationConfigurer(Element element) {
+			this.element = element;
+		}
+
+		@Override
+		public OpenSaml5SerializationConfigurer prettyPrint(boolean pretty) {
+			this.pretty = pretty;
+			return this;
+		}
+
+		@Override
+		public String serialize() {
+			if (this.pretty) {
+				return SerializeSupport.prettyPrintXML(this.element);
+			}
+			return SerializeSupport.nodeToString(this.element);
+		}
+
+	}
+
+	static final class OpenSaml5SignatureConfigurer implements SignatureConfigurer<OpenSaml5SignatureConfigurer> {
+
+		private final Collection<Saml2X509Credential> credentials;
+
+		private final Map<String, String> components = new LinkedHashMap<>();
+
+		private List<String> algs = List.of(SignatureConstants.ALGO_ID_SIGNATURE_RSA_SHA256);
+
+		OpenSaml5SignatureConfigurer(Collection<Saml2X509Credential> credentials) {
+			this.credentials = credentials;
+		}
+
+		@Override
+		public OpenSaml5SignatureConfigurer algorithms(List<String> algs) {
+			this.algs = algs;
+			return this;
+		}
+
+		@Override
+		public <O extends SignableXMLObject> O sign(O object) {
+			SignatureSigningParameters parameters = resolveSigningParameters();
+			try {
+				SignatureSupport.signObject(object, parameters);
+			}
+			catch (Exception ex) {
+				throw new Saml2Exception(ex);
+			}
+			return object;
+		}
+
+		@Override
+		public Map<String, String> sign(Map<String, String> params) {
+			SignatureSigningParameters parameters = resolveSigningParameters();
+			this.components.putAll(params);
+			Credential credential = parameters.getSigningCredential();
+			String algorithmUri = parameters.getSignatureAlgorithm();
+			this.components.put(Saml2ParameterNames.SIG_ALG, algorithmUri);
+			UriComponentsBuilder builder = UriComponentsBuilder.newInstance();
+			for (Map.Entry<String, String> component : this.components.entrySet()) {
+				builder.queryParam(component.getKey(),
+						UriUtils.encode(component.getValue(), StandardCharsets.ISO_8859_1));
+			}
+			String queryString = builder.build(true).toString().substring(1);
+			try {
+				byte[] rawSignature = XMLSigningUtil.signWithURI(credential, algorithmUri,
+						queryString.getBytes(StandardCharsets.UTF_8));
+				String b64Signature = Saml2Utils.samlEncode(rawSignature);
+				this.components.put(Saml2ParameterNames.SIGNATURE, b64Signature);
+			}
+			catch (SecurityException ex) {
+				throw new Saml2Exception(ex);
+			}
+			return this.components;
+		}
+
+		private SignatureSigningParameters resolveSigningParameters() {
+			List<Credential> credentials = resolveSigningCredentials();
+			List<String> digests = Collections.singletonList(SignatureConstants.ALGO_ID_DIGEST_SHA256);
+			String canonicalization = SignatureConstants.ALGO_ID_C14N_EXCL_OMIT_COMMENTS;
+			SignatureSigningParametersResolver resolver = new SAMLMetadataSignatureSigningParametersResolver();
+			BasicSignatureSigningConfiguration signingConfiguration = new BasicSignatureSigningConfiguration();
+			signingConfiguration.setSigningCredentials(credentials);
+			signingConfiguration.setSignatureAlgorithms(this.algs);
+			signingConfiguration.setSignatureReferenceDigestMethods(digests);
+			signingConfiguration.setSignatureCanonicalizationAlgorithm(canonicalization);
+			signingConfiguration.setKeyInfoGeneratorManager(buildSignatureKeyInfoGeneratorManager());
+			CriteriaSet criteria = new CriteriaSet(new SignatureSigningConfigurationCriterion(signingConfiguration));
+			try {
+				SignatureSigningParameters parameters = resolver.resolveSingle(criteria);
+				Assert.notNull(parameters, "Failed to resolve any signing credential");
+				return parameters;
+			}
+			catch (Exception ex) {
+				throw new Saml2Exception(ex);
+			}
+		}
+
+		private NamedKeyInfoGeneratorManager buildSignatureKeyInfoGeneratorManager() {
+			final NamedKeyInfoGeneratorManager namedManager = new NamedKeyInfoGeneratorManager();
+
+			namedManager.setUseDefaultManager(true);
+			final KeyInfoGeneratorManager defaultManager = namedManager.getDefaultManager();
+
+			// Generator for X509Credentials
+			final X509KeyInfoGeneratorFactory x509Factory = new X509KeyInfoGeneratorFactory();
+			x509Factory.setEmitEntityCertificate(true);
+			x509Factory.setEmitEntityCertificateChain(true);
+
+			defaultManager.registerFactory(x509Factory);
+
+			return namedManager;
+		}
+
+		private List<Credential> resolveSigningCredentials() {
+			List<Credential> credentials = new ArrayList<>();
+			for (Saml2X509Credential x509Credential : this.credentials) {
+				X509Certificate certificate = x509Credential.getCertificate();
+				PrivateKey privateKey = x509Credential.getPrivateKey();
+				BasicCredential credential = CredentialSupport.getSimpleCredential(certificate, privateKey);
+				credential.setUsageType(UsageType.SIGNING);
+				credentials.add(credential);
+			}
+			return credentials;
+		}
+
+	}
+
+	static final class OpenSaml5VerificationConfigurer implements VerificationConfigurer {
+
+		private final Collection<Saml2X509Credential> credentials;
+
+		private String entityId;
+
+		OpenSaml5VerificationConfigurer(Collection<Saml2X509Credential> credentials) {
+			this.credentials = credentials;
+		}
+
+		@Override
+		public VerificationConfigurer entityId(String entityId) {
+			this.entityId = entityId;
+			return this;
+		}
+
+		private SignatureTrustEngine trustEngine(Collection<Saml2X509Credential> keys) {
+			Set<Credential> credentials = new HashSet<>();
+			for (Saml2X509Credential key : keys) {
+				BasicX509Credential cred = new BasicX509Credential(key.getCertificate());
+				cred.setUsageType(UsageType.SIGNING);
+				cred.setEntityId(this.entityId);
+				credentials.add(cred);
+			}
+			CredentialResolver credentialsResolver = new CollectionCredentialResolver(credentials);
+			return new ExplicitKeySignatureTrustEngine(credentialsResolver,
+					DefaultSecurityConfigurationBootstrap.buildBasicInlineKeyInfoCredentialResolver());
+		}
+
+		private CriteriaSet verificationCriteria(Issuer issuer) {
+			return new CriteriaSet(new EvaluableEntityIDCredentialCriterion(new EntityIdCriterion(issuer.getValue())),
+					new EvaluableProtocolRoleDescriptorCriterion(new ProtocolCriterion(SAMLConstants.SAML20P_NS)),
+					new EvaluableUsageCredentialCriterion(new UsageCriterion(UsageType.SIGNING)));
+		}
+
+		@Override
+		public Collection<Saml2Error> verify(SignableXMLObject signable) {
+			if (signable instanceof StatusResponseType response) {
+				return verifySignature(response.getID(), response.getIssuer(), response.getSignature());
+			}
+			if (signable instanceof RequestAbstractType request) {
+				return verifySignature(request.getID(), request.getIssuer(), request.getSignature());
+			}
+			if (signable instanceof Assertion assertion) {
+				return verifySignature(assertion.getID(), assertion.getIssuer(), assertion.getSignature());
+			}
+			throw new Saml2Exception("Unsupported object of type: " + signable.getClass().getName());
+		}
+
+		private Collection<Saml2Error> verifySignature(String id, Issuer issuer, Signature signature) {
+			SignatureTrustEngine trustEngine = trustEngine(this.credentials);
+			CriteriaSet criteria = verificationCriteria(issuer);
+			Collection<Saml2Error> errors = new ArrayList<>();
+			SAMLSignatureProfileValidator profileValidator = new SAMLSignatureProfileValidator();
+			try {
+				profileValidator.validate(signature);
+			}
+			catch (Exception ex) {
+				errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Invalid signature for object [" + id + "]: "));
+			}
+
+			try {
+				if (!trustEngine.validate(signature, criteria)) {
+					errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+							"Invalid signature for object [" + id + "]"));
+				}
+			}
+			catch (Exception ex) {
+				errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Invalid signature for object [" + id + "]: "));
+			}
+
+			return errors;
+		}
+
+		@Override
+		public Collection<Saml2Error> verify(RedirectParameters parameters) {
+			SignatureTrustEngine trustEngine = trustEngine(this.credentials);
+			CriteriaSet criteria = verificationCriteria(parameters.getIssuer());
+			if (parameters.getAlgorithm() == null) {
+				return Collections.singletonList(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Missing signature algorithm for object [" + parameters.getId() + "]"));
+			}
+			if (!parameters.hasSignature()) {
+				return Collections.singletonList(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Missing signature for object [" + parameters.getId() + "]"));
+			}
+			Collection<Saml2Error> errors = new ArrayList<>();
+			String algorithmUri = parameters.getAlgorithm();
+			try {
+				if (!trustEngine.validate(parameters.getSignature(), parameters.getContent(), algorithmUri, criteria,
+						null)) {
+					errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+							"Invalid signature for object [" + parameters.getId() + "]"));
+				}
+			}
+			catch (Exception ex) {
+				errors.add(new Saml2Error(Saml2ErrorCodes.INVALID_SIGNATURE,
+						"Invalid signature for object [" + parameters.getId() + "]: "));
+			}
+			return errors;
+		}
+
+	}
+
+	static final class OpenSaml5DecryptionConfigurer implements DecryptionConfigurer {
+
+		private static final EncryptedKeyResolver encryptedKeyResolver = new ChainingEncryptedKeyResolver(
+				Arrays.asList(new InlineEncryptedKeyResolver(), new EncryptedElementTypeEncryptedKeyResolver(),
+						new SimpleRetrievalMethodEncryptedKeyResolver()));
+
+		private final Decrypter decrypter;
+
+		OpenSaml5DecryptionConfigurer(Collection<Saml2X509Credential> decryptionCredentials) {
+			this.decrypter = decrypter(decryptionCredentials);
+		}
+
+		private static Decrypter decrypter(Collection<Saml2X509Credential> decryptionCredentials) {
+			Collection<Credential> credentials = new ArrayList<>();
+			for (Saml2X509Credential key : decryptionCredentials) {
+				Credential cred = CredentialSupport.getSimpleCredential(key.getCertificate(), key.getPrivateKey());
+				credentials.add(cred);
+			}
+			KeyInfoCredentialResolver resolver = new CollectionKeyInfoCredentialResolver(credentials);
+			Decrypter decrypter = new Decrypter(null, resolver, encryptedKeyResolver);
+			decrypter.setRootInNewDocument(true);
+			return decrypter;
+		}
+
+		@Override
+		public void decrypt(XMLObject object) {
+			if (object instanceof Response response) {
+				decryptResponse(response);
+				return;
+			}
+			if (object instanceof Assertion assertion) {
+				decryptAssertion(assertion);
+			}
+			if (object instanceof LogoutRequest request) {
+				decryptLogoutRequest(request);
+			}
+		}
+
+		/*
+		 * The methods that follow are adapted from OpenSAML's {@link DecryptAssertions},
+		 * {@link DecryptNameIDs}, and {@link DecryptAttributes}.
+		 *
+		 * <p>The reason that these OpenSAML classes are not used directly is because they
+		 * reference {@link javax.servlet.http.HttpServletRequest} which is a lower
+		 * Servlet API version than what Spring Security SAML uses.
+		 *
+		 * If OpenSAML 5 updates to {@link jakarta.servlet.http.HttpServletRequest}, then
+		 * this arrangement can be revisited.
+		 */
+
+		private void decryptResponse(Response response) {
+			Collection<Assertion> decrypteds = new ArrayList<>();
+			Collection<EncryptedAssertion> encrypteds = new ArrayList<>();
+
+			int count = 0;
+			int size = response.getEncryptedAssertions().size();
+			for (EncryptedAssertion encrypted : response.getEncryptedAssertions()) {
+				logger.trace(String.format("Decrypting EncryptedAssertion (%d/%d) in Response [%s]", count, size,
+						response.getID()));
+				try {
+					Assertion decrypted = this.decrypter.decrypt(encrypted);
+					if (decrypted != null) {
+						encrypteds.add(encrypted);
+						decrypteds.add(decrypted);
+					}
+					count++;
+				}
+				catch (DecryptionException ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+
+			response.getEncryptedAssertions().removeAll(encrypteds);
+			response.getAssertions().addAll(decrypteds);
+
+			// Re-marshall the response so that any ID attributes within the decrypted
+			// Assertions
+			// will have their ID-ness re-established at the DOM level.
+			if (!decrypteds.isEmpty()) {
+				try {
+					XMLObjectSupport.marshall(response);
+				}
+				catch (final MarshallingException ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+		}
+
+		private void decryptAssertion(Assertion assertion) {
+			for (AttributeStatement statement : assertion.getAttributeStatements()) {
+				decryptAttributes(statement);
+			}
+			decryptSubject(assertion.getSubject());
+			if (assertion.getConditions() != null) {
+				for (Condition c : assertion.getConditions().getConditions()) {
+					if (!(c instanceof DelegationRestrictionType delegation)) {
+						continue;
+					}
+					for (Delegate d : delegation.getDelegates()) {
+						if (d.getEncryptedID() != null) {
+							try {
+								NameID decrypted = (NameID) this.decrypter.decrypt(d.getEncryptedID());
+								if (decrypted != null) {
+									d.setNameID(decrypted);
+									d.setEncryptedID(null);
+								}
+							}
+							catch (DecryptionException ex) {
+								throw new Saml2Exception(ex);
+							}
+						}
+					}
+				}
+			}
+		}
+
+		private void decryptAttributes(AttributeStatement statement) {
+			Collection<Attribute> decrypteds = new ArrayList<>();
+			Collection<EncryptedAttribute> encrypteds = new ArrayList<>();
+			for (EncryptedAttribute encrypted : statement.getEncryptedAttributes()) {
+				try {
+					Attribute decrypted = this.decrypter.decrypt(encrypted);
+					if (decrypted != null) {
+						encrypteds.add(encrypted);
+						decrypteds.add(decrypted);
+					}
+				}
+				catch (Exception ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+			statement.getEncryptedAttributes().removeAll(encrypteds);
+			statement.getAttributes().addAll(decrypteds);
+		}
+
+		private void decryptSubject(Subject subject) {
+			if (subject != null) {
+				if (subject.getEncryptedID() != null) {
+					try {
+						NameID decrypted = (NameID) this.decrypter.decrypt(subject.getEncryptedID());
+						if (decrypted != null) {
+							subject.setNameID(decrypted);
+							subject.setEncryptedID(null);
+						}
+					}
+					catch (final DecryptionException ex) {
+						throw new Saml2Exception(ex);
+					}
+				}
+
+				for (final SubjectConfirmation sc : subject.getSubjectConfirmations()) {
+					if (sc.getEncryptedID() != null) {
+						try {
+							NameID decrypted = (NameID) this.decrypter.decrypt(sc.getEncryptedID());
+							if (decrypted != null) {
+								sc.setNameID(decrypted);
+								sc.setEncryptedID(null);
+							}
+						}
+						catch (final DecryptionException ex) {
+							throw new Saml2Exception(ex);
+						}
+					}
+				}
+			}
+		}
+
+		private void decryptLogoutRequest(LogoutRequest request) {
+			if (request.getEncryptedID() != null) {
+				try {
+					NameID decrypted = (NameID) this.decrypter.decrypt(request.getEncryptedID());
+					if (decrypted != null) {
+						request.setNameID(decrypted);
+						request.setEncryptedID(null);
+					}
+				}
+				catch (DecryptionException ex) {
+					throw new Saml2Exception(ex);
+				}
+			}
+		}
+
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Test/java/org/springframework/security/saml2/provider/service/authentication/OpenSaml5AuthenticationProviderTests.java

@@ -0,0 +1,945 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.authentication;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectOutputStream;
+import java.time.Duration;
+import java.time.Instant;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Consumer;
+
+import javax.xml.namespace.QName;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.Test;
+import org.opensaml.core.xml.XMLObject;
+import org.opensaml.core.xml.config.XMLObjectProviderRegistrySupport;
+import org.opensaml.core.xml.schema.XSDateTime;
+import org.opensaml.core.xml.schema.impl.XSDateTimeBuilder;
+import org.opensaml.saml.common.SignableSAMLObject;
+import org.opensaml.saml.common.assertion.ValidationContext;
+import org.opensaml.saml.saml2.assertion.SAML2AssertionValidationParameters;
+import org.opensaml.saml.saml2.core.Assertion;
+import org.opensaml.saml.saml2.core.Attribute;
+import org.opensaml.saml.saml2.core.AttributeStatement;
+import org.opensaml.saml.saml2.core.AttributeValue;
+import org.opensaml.saml.saml2.core.Conditions;
+import org.opensaml.saml.saml2.core.EncryptedAssertion;
+import org.opensaml.saml.saml2.core.EncryptedAttribute;
+import org.opensaml.saml.saml2.core.EncryptedID;
+import org.opensaml.saml.saml2.core.NameID;
+import org.opensaml.saml.saml2.core.OneTimeUse;
+import org.opensaml.saml.saml2.core.ProxyRestriction;
+import org.opensaml.saml.saml2.core.Response;
+import org.opensaml.saml.saml2.core.Status;
+import org.opensaml.saml.saml2.core.StatusCode;
+import org.opensaml.saml.saml2.core.SubjectConfirmation;
+import org.opensaml.saml.saml2.core.SubjectConfirmationData;
+import org.opensaml.saml.saml2.core.impl.AttributeBuilder;
+import org.opensaml.saml.saml2.core.impl.EncryptedAssertionBuilder;
+import org.opensaml.saml.saml2.core.impl.EncryptedIDBuilder;
+import org.opensaml.saml.saml2.core.impl.NameIDBuilder;
+import org.opensaml.saml.saml2.core.impl.ProxyRestrictionBuilder;
+import org.opensaml.saml.saml2.core.impl.StatusBuilder;
+import org.opensaml.saml.saml2.core.impl.StatusCodeBuilder;
+import org.opensaml.xmlsec.encryption.impl.EncryptedDataBuilder;
+import org.opensaml.xmlsec.signature.support.SignatureConstants;
+
+import org.springframework.core.convert.converter.Converter;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.jackson2.SecurityJackson2Modules;
+import org.springframework.security.saml2.core.Saml2Error;
+import org.springframework.security.saml2.core.Saml2ErrorCodes;
+import org.springframework.security.saml2.core.Saml2ResponseValidatorResult;
+import org.springframework.security.saml2.core.TestSaml2X509Credentials;
+import org.springframework.security.saml2.provider.service.authentication.OpenSaml5AuthenticationProvider.ResponseToken;
+import org.springframework.security.saml2.provider.service.authentication.TestCustomOpenSaml5Objects.CustomOpenSamlObject;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistration;
+import org.springframework.security.saml2.provider.service.registration.TestRelyingPartyRegistrations;
+import org.springframework.util.StringUtils;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
+import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.Mockito.atLeastOnce;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+
+/**
+ * Tests for {@link OpenSaml5AuthenticationProvider}
+ *
+ * @author Filip Hanik
+ * @author Josh Cummings
+ */
+public class OpenSaml5AuthenticationProviderTests {
+
+	private static String DESTINATION = "https://localhost/login/saml2/sso/idp-alias";
+
+	private static String RELYING_PARTY_ENTITY_ID = "https://localhost/saml2/service-provider-metadata/idp-alias";
+
+	private static String ASSERTING_PARTY_ENTITY_ID = "https://some.idp.test/saml2/idp";
+
+	private final OpenSamlOperations saml = new OpenSaml5Template();
+
+	private OpenSaml5AuthenticationProvider provider = new OpenSaml5AuthenticationProvider();
+
+	private Saml2AuthenticatedPrincipal principal = new DefaultSaml2AuthenticatedPrincipal("name",
+			Collections.emptyMap());
+
+	private Saml2Authentication authentication = new Saml2Authentication(this.principal, "response",
+			Collections.emptyList());
+
+	@Test
+	public void supportsWhenSaml2AuthenticationTokenThenReturnTrue() {
+		assertThat(this.provider.supports(Saml2AuthenticationToken.class))
+			.withFailMessage(OpenSaml5AuthenticationProvider.class + "should support " + Saml2AuthenticationToken.class)
+			.isTrue();
+	}
+
+	@Test
+	public void supportsWhenNotSaml2AuthenticationTokenThenReturnFalse() {
+		assertThat(!this.provider.supports(Authentication.class))
+			.withFailMessage(OpenSaml5AuthenticationProvider.class + "should not support " + Authentication.class)
+			.isTrue();
+	}
+
+	@Test
+	public void authenticateWhenUnknownDataClassThenThrowAuthenticationException() {
+		Assertion assertion = (Assertion) XMLObjectProviderRegistrySupport.getBuilderFactory()
+			.getBuilder(Assertion.DEFAULT_ELEMENT_NAME)
+			.buildObject(Assertion.DEFAULT_ELEMENT_NAME);
+		assertThatExceptionOfType(Saml2AuthenticationException.class)
+			.isThrownBy(() -> this.provider
+				.authenticate(new Saml2AuthenticationToken(verifying(registration()).build(), serialize(assertion))))
+			.satisfies(errorOf(Saml2ErrorCodes.MALFORMED_RESPONSE_DATA));
+	}
+
+	@Test
+	public void authenticateWhenXmlErrorThenThrowAuthenticationException() {
+		Saml2AuthenticationToken token = new Saml2AuthenticationToken(verifying(registration()).build(), "invalid xml");
+		assertThatExceptionOfType(Saml2AuthenticationException.class)
+			.isThrownBy(() -> this.provider.authenticate(token))
+			.satisfies(errorOf(Saml2ErrorCodes.MALFORMED_RESPONSE_DATA));
+	}
+
+	@Test
+	public void authenticateWhenInvalidDestinationThenThrowAuthenticationException() {
+		Response response = response(DESTINATION + "invalid", ASSERTING_PARTY_ENTITY_ID);
+		response.getAssertions().add(assertion());
+		Saml2AuthenticationToken token = token(signed(response), verifying(registration()));
+		assertThatExceptionOfType(Saml2AuthenticationException.class)
+			.isThrownBy(() -> this.provider.authenticate(token))
+			.satisfies(errorOf(Saml2ErrorCodes.INVALID_DESTINATION));
+	}
+
+	@Test
+	public void authenticateWhenNoAssertionsPresentThenThrowAuthenticationException() {
+		Saml2AuthenticationToken token = token();
+		assertThatExceptionOfType(Saml2AuthenticationException.class)
+			.isThrownBy(() -> this.provider.authenticate(token))
+			.satisfies(errorOf(Saml2ErrorCodes.MALFORMED_RESPONSE_DATA, "No assertions found in response."));
+	}
+
+	@Test
+	public void authenticateWhenInvalidSignatureOnAssertionThenThrowAuthenticationException() {
+		Response response = response();
+		response.getAssertions().add(assertion());
+		Saml2AuthenticationToken token = token(response, verifying(registration()));
+		assertThatExceptionOfType(Saml2AuthenticationException.class)
+			.isThrownBy(() -> this.provider.authenticate(token))
+			.satisfies(errorOf(Saml2ErrorCodes.INVALID_SIGNATURE));
+	}
+
+	@Test
+	public void authenticateWhenOpenSAMLValidationErrorThenThrowAuthenticationException() {
+		Response response = response();
+		Assertion assertion = assertion();
+		assertion.getSubject()
+			.getSubjectConfirmations()
+			.get(0)
+			.getSubjectConfirmationData()
+			.setNotOnOrAfter(Instant.now().minus(Duration.ofDays(3)));
+		response.getAssertions().add(signed(assertion));
+		Saml2AuthenticationToken token = token(response, verifying(registration()));
+		assertThatExceptionOfType(Saml2AuthenticationException.class)
+			.isThrownBy(() -> this.provider.authenticate(token))
+			.satisfies(errorOf(Saml2ErrorCodes.INVALID_ASSERTION));
+	}
+
+	@Test
+	public void authenticateWhenMissingSubjectThenThrowAuthenticationException() {
+		Response response = response();
+		Assertion assertion = assertion();
+		assertion.setSubject(null);
+		response.getAssertions().add(signed(assertion));
+		Saml2AuthenticationToken token = token(response, verifying(registration()));
+		assertThatExceptionOfType(Saml2AuthenticationException.class)
+			.isThrownBy(() -> this.provider.authenticate(token))
+			.satisfies(errorOf(Saml2ErrorCodes.SUBJECT_NOT_FOUND));
+	}
+
+	@Test
+	public void authenticateWhenUsernameMissingThenThrowAuthenticationException() {
+		Response response = response();
+		Assertion assertion = assertion();
+		assertion.getSubject().getNameID().setValue(null);
+		response.getAssertions().add(signed(assertion));
+		Saml2AuthenticationToken token = token(response, verifying(registration()));
+		assertThatExceptionOfType(Saml2AuthenticationException.class)
+			.isThrownBy(() -> this.provider.authenticate(token))
+			.satisfies(errorOf(Saml2ErrorCodes.SUBJECT_NOT_FOUND));
+	}
+
+	@Test
+	public void authenticateWhenAssertionContainsValidationAddressThenItSucceeds() {
+		Response response = response();
+		Assertion assertion = assertion();
+		assertion.getSubject()
+			.getSubjectConfirmations()
+			.forEach((sc) -> sc.getSubjectConfirmationData().setAddress("10.10.10.10"));
+		response.getAssertions().add(signed(assertion));
+		Saml2AuthenticationToken token = token(response, verifying(registration()));
+		this.provider.authenticate(token);
+	}
+
+	@Test
+	public void evaluateInResponseToSucceedsWhenInResponseToInResponseAndAssertionsMatchRequestID() {
+		Response response = response();
+		response.setInResponseTo("SAML2");
+		response.getAssertions().add(signed(assertion("SAML2")));
+		response.getAssertions().add(signed(assertion("SAML2")));
+		AbstractSaml2AuthenticationRequest mockAuthenticationRequest = mockedStoredAuthenticationRequest("SAML2");
+		Saml2AuthenticationToken token = token(response, verifying(registration()), mockAuthenticationRequest);
+		this.provider.authenticate(token);
+	}
+
+	@Test
+	public void evaluateInResponseToSucceedsWhenInResponseToInAssertionOnlyMatchRequestID() {
+		Response response = response();
+		response.getAssertions().add(signed(assertion()));
+		response.getAssertions().add(signed(assertion("SAML2")));
+		AbstractSaml2AuthenticationRequest mockAuthenticationRequest = mockedStoredAuthenticationRequest("SAML2");
+		Saml2AuthenticationToken token = token(response, verifying(registration()), mockAuthenticationRequest);
+		this.provider.authenticate(token);
+	}
+
+	@Test
+	public void evaluateInResponseToFailsWhenInResponseToInAssertionMismatchWithRequestID() {
+		Response response = response();
+		response.setInResponseTo("SAML2");
+		response.getAssertions().add(signed(assertion("SAML2")));
+		response.getAssertions().add(signed(assertion("BAD")));
+		AbstractSaml2AuthenticationRequest mockAuthenticationRequest = mockedStoredAuthenticationRequest("SAML2");
+		Saml2AuthenticationToken token = token(response, verifying(registration()), mockAuthenticationRequest);
+		assertThatExceptionOfType(Saml2AuthenticationException.class)
+			.isThrownBy(() -> this.provider.authenticate(token))
+			.withStackTraceContaining("invalid_assertion");
+	}
+
+	@Test
+	public void evaluateInResponseToFailsWhenInResponseToInAssertionOnlyAndMismatchWithRequestID() {
+		Response response = response();
+		response.getAssertions().add(signed(assertion()));
+		response.getAssertions().add(signed(assertion("BAD")));
+		AbstractSaml2AuthenticationRequest mockAuthenticationRequest = mockedStoredAuthenticationRequest("SAML2");
+		Saml2AuthenticationToken token = token(response, verifying(registration()), mockAuthenticationRequest);
+		assertThatExceptionOfType(Saml2AuthenticationException.class)
+			.isThrownBy(() -> this.provider.authenticate(token))
+			.withStackTraceContaining("invalid_assertion");
+	}
+
+	@Test
+	public void evaluateInResponseToFailsWhenInResponseInToResponseMismatchWithRequestID() {
+		Response response = response();
+		response.setInResponseTo("BAD");
+		response.getAssertions().add(signed(assertion("SAML2")));
+		response.getAssertions().add(signed(assertion("SAML2")));
+		AbstractSaml2AuthenticationRequest mockAuthenticationRequest = mockedStoredAuthenticationRequest("SAML2");
+		Saml2AuthenticationToken token = token(response, verifying(registration()), mockAuthenticationRequest);
+		assertThatExceptionOfType(Saml2AuthenticationException.class)
+			.isThrownBy(() -> this.provider.authenticate(token))
+			.withStackTraceContaining("invalid_in_response_to");
+	}
+
+	@Test
+	public void evaluateInResponseToFailsWhenInResponseToInResponseButNoSavedRequest() {
+		Response response = response();
+		response.setInResponseTo("BAD");
+		Saml2AuthenticationToken token = token(response, verifying(registration()));
+		assertThatExceptionOfType(Saml2AuthenticationException.class)
+			.isThrownBy(() -> this.provider.authenticate(token))
+			.withStackTraceContaining("invalid_in_response_to");
+	}
+
+	@Test
+	public void evaluateInResponseToSucceedsWhenNoInResponseToInResponseOrAssertions() {
+		Response response = response();
+		response.getAssertions().add(signed(assertion()));
+		AbstractSaml2AuthenticationRequest mockAuthenticationRequest = mockedStoredAuthenticationRequest("SAML2");
+		Saml2AuthenticationToken token = token(response, verifying(registration()), mockAuthenticationRequest);
+		this.provider.authenticate(token);
+	}
+
+	@Test
+	public void authenticateWhenAssertionContainsAttributesThenItSucceeds() {
+		Response response = response();
+		Assertion assertion = assertion();
+		List<AttributeStatement> attributes = attributeStatements();
+		assertion.getAttributeStatements().addAll(attributes);
+		response.getAssertions().add(signed(assertion));
+		Saml2AuthenticationToken token = token(response, verifying(registration()));
+		Authentication authentication = this.provider.authenticate(token);
+		Saml2AuthenticatedPrincipal principal = (Saml2AuthenticatedPrincipal) authentication.getPrincipal();
+		Map<String, Object> expected = new LinkedHashMap<>();
+		expected.put("email", Arrays.asList("john.doe@example.com", "doe.john@example.com"));
+		expected.put("name", Collections.singletonList("John Doe"));
+		expected.put("age", Collections.singletonList(21));
+		expected.put("website", Collections.singletonList("https://johndoe.com/"));
+		expected.put("registered", Collections.singletonList(true));
+		Instant registeredDate = Instant.parse("1970-01-01T00:00:00Z");
+		expected.put("registeredDate", Collections.singletonList(registeredDate));
+		expected.put("role", Arrays.asList("RoleOne", "RoleTwo")); // gh-11042
+		assertThat((String) principal.getFirstAttribute("name")).isEqualTo("John Doe");
+		assertThat(principal.getAttributes()).isEqualTo(expected);
+		assertThat(principal.getSessionIndexes()).contains("session-index");
+	}
+
+	// gh-11785
+	@Test
+	public void deserializeWhenAssertionContainsAttributesThenWorks() throws Exception {
+		ObjectMapper mapper = new ObjectMapper();
+		ClassLoader loader = getClass().getClassLoader();
+		mapper.registerModules(SecurityJackson2Modules.getModules(loader));
+		Response response = response();
+		Assertion assertion = assertion();
+		List<AttributeStatement> attributes = TestOpenSamlObjects.attributeStatements();
+		assertion.getAttributeStatements().addAll(attributes);
+		response.getAssertions().add(signed(assertion));
+		Saml2AuthenticationToken token = token(response, verifying(registration()));
+		Authentication authentication = this.provider.authenticate(token);
+		String result = mapper.writeValueAsString(authentication);
+		mapper.readValue(result, Authentication.class);
+	}
+
+	@Test
+	public void authenticateWhenAssertionContainsCustomAttributesThenItSucceeds() {
+		Response response = response();
+		Assertion assertion = assertion();
+		AttributeStatement attribute = TestOpenSamlObjects.customAttributeStatement("Address",
+				TestCustomOpenSaml5Objects.instance());
+		assertion.getAttributeStatements().add(attribute);
+		response.getAssertions().add(signed(assertion));
+		Saml2AuthenticationToken token = token(response, verifying(registration()));
+		Authentication authentication = this.provider.authenticate(token);
+		Saml2AuthenticatedPrincipal principal = (Saml2AuthenticatedPrincipal) authentication.getPrincipal();
+		CustomOpenSamlObject address = (CustomOpenSamlObject) principal.getAttribute("Address").get(0);
+		assertThat(address.getStreet()).isEqualTo("Test Street");
+		assertThat(address.getStreetNumber()).isEqualTo("1");
+		assertThat(address.getZIP()).isEqualTo("11111");
+		assertThat(address.getCity()).isEqualTo("Test City");
+	}
+
+	@Test
+	public void authenticateWhenEncryptedAssertionWithoutSignatureThenItFails() {
+		Response response = response();
+		EncryptedAssertion encryptedAssertion = TestOpenSamlObjects.encrypted(assertion(),
+				TestSaml2X509Credentials.assertingPartyEncryptingCredential());
+		response.getEncryptedAssertions().add(encryptedAssertion);
+		Saml2AuthenticationToken token = token(response, decrypting(verifying(registration())));
+		assertThatExceptionOfType(Saml2AuthenticationException.class)
+			.isThrownBy(() -> this.provider.authenticate(token))
+			.satisfies(errorOf(Saml2ErrorCodes.INVALID_SIGNATURE, "Did not decrypt response"));
+	}
+
+	@Test
+	public void authenticateWhenEncryptedAssertionWithSignatureThenItSucceeds() {
+		Response response = response();
+		Assertion assertion = TestOpenSamlObjects.signed(assertion(),
+				TestSaml2X509Credentials.assertingPartySigningCredential(), RELYING_PARTY_ENTITY_ID);
+		EncryptedAssertion encryptedAssertion = TestOpenSamlObjects.encrypted(assertion,
+				TestSaml2X509Credentials.assertingPartyEncryptingCredential());
+		response.getEncryptedAssertions().add(encryptedAssertion);
+		Saml2AuthenticationToken token = token(signed(response), decrypting(verifying(registration())));
+		this.provider.authenticate(token);
+	}
+
+	@Test
+	public void authenticateWhenEncryptedAssertionWithResponseSignatureThenItSucceeds() {
+		Response response = response();
+		EncryptedAssertion encryptedAssertion = TestOpenSamlObjects.encrypted(assertion(),
+				TestSaml2X509Credentials.assertingPartyEncryptingCredential());
+		response.getEncryptedAssertions().add(encryptedAssertion);
+		Saml2AuthenticationToken token = token(signed(response), decrypting(verifying(registration())));
+		this.provider.authenticate(token);
+	}
+
+	@Test
+	public void authenticateWhenEncryptedNameIdWithSignatureThenItSucceeds() {
+		Response response = response();
+		Assertion assertion = assertion();
+		NameID nameId = assertion.getSubject().getNameID();
+		EncryptedID encryptedID = TestOpenSamlObjects.encrypted(nameId,
+				TestSaml2X509Credentials.assertingPartyEncryptingCredential());
+		assertion.getSubject().setNameID(null);
+		assertion.getSubject().setEncryptedID(encryptedID);
+		response.getAssertions().add(signed(assertion));
+		Saml2AuthenticationToken token = token(response, decrypting(verifying(registration())));
+		this.provider.authenticate(token);
+	}
+
+	@Test
+	public void authenticateWhenEncryptedAttributeThenDecrypts() {
+		Response response = response();
+		Assertion assertion = assertion();
+		EncryptedAttribute attribute = TestOpenSamlObjects.encrypted("name", "value",
+				TestSaml2X509Credentials.assertingPartyEncryptingCredential());
+		AttributeStatement statement = build(AttributeStatement.DEFAULT_ELEMENT_NAME);
+		statement.getEncryptedAttributes().add(attribute);
+		assertion.getAttributeStatements().add(statement);
+		response.getAssertions().add(assertion);
+		Saml2AuthenticationToken token = token(signed(response), decrypting(verifying(registration())));
+		Saml2Authentication authentication = (Saml2Authentication) this.provider.authenticate(token);
+		Saml2AuthenticatedPrincipal principal = (Saml2AuthenticatedPrincipal) authentication.getPrincipal();
+		assertThat(principal.getAttribute("name")).containsExactly("value");
+	}
+
+	@Test
+	public void authenticateWhenDecryptionKeysAreMissingThenThrowAuthenticationException() {
+		Response response = response();
+		EncryptedAssertion encryptedAssertion = TestOpenSamlObjects.encrypted(assertion(),
+				TestSaml2X509Credentials.assertingPartyEncryptingCredential());
+		response.getEncryptedAssertions().add(encryptedAssertion);
+		Saml2AuthenticationToken token = token(signed(response), verifying(registration()));
+		assertThatExceptionOfType(Saml2AuthenticationException.class)
+			.isThrownBy(() -> this.provider.authenticate(token))
+			.satisfies(errorOf(Saml2ErrorCodes.DECRYPTION_ERROR, "Failed to decrypt EncryptedData"));
+	}
+
+	@Test
+	public void authenticateWhenDecryptionKeysAreWrongThenThrowAuthenticationException() {
+		Response response = response();
+		EncryptedAssertion encryptedAssertion = TestOpenSamlObjects.encrypted(assertion(),
+				TestSaml2X509Credentials.assertingPartyEncryptingCredential());
+		response.getEncryptedAssertions().add(encryptedAssertion);
+		Saml2AuthenticationToken token = token(signed(response), registration()
+			.decryptionX509Credentials((c) -> c.add(TestSaml2X509Credentials.assertingPartyPrivateCredential())));
+		assertThatExceptionOfType(Saml2AuthenticationException.class)
+			.isThrownBy(() -> this.provider.authenticate(token))
+			.satisfies(errorOf(Saml2ErrorCodes.DECRYPTION_ERROR, "Failed to decrypt EncryptedData"));
+	}
+
+	@Test
+	public void authenticateWhenAuthenticationHasDetailsThenSucceeds() {
+		Response response = response();
+		Assertion assertion = assertion();
+		assertion.getSubject()
+			.getSubjectConfirmations()
+			.forEach((sc) -> sc.getSubjectConfirmationData().setAddress("10.10.10.10"));
+		response.getAssertions().add(signed(assertion));
+		Saml2AuthenticationToken token = token(response, verifying(registration()));
+		token.setDetails("some-details");
+		Authentication authentication = this.provider.authenticate(token);
+		assertThat(authentication.getDetails()).isEqualTo("some-details");
+	}
+
+	@Test
+	public void writeObjectWhenTypeIsSaml2AuthenticationThenNoException() throws IOException {
+		Response response = response();
+		Assertion assertion = TestOpenSamlObjects.signed(assertion(),
+				TestSaml2X509Credentials.assertingPartySigningCredential(), RELYING_PARTY_ENTITY_ID);
+		EncryptedAssertion encryptedAssertion = TestOpenSamlObjects.encrypted(assertion,
+				TestSaml2X509Credentials.assertingPartyEncryptingCredential());
+		response.getEncryptedAssertions().add(encryptedAssertion);
+		Saml2AuthenticationToken token = token(signed(response), decrypting(verifying(registration())));
+		Saml2Authentication authentication = (Saml2Authentication) this.provider.authenticate(token);
+		// the following code will throw an exception if authentication isn't serializable
+		ByteArrayOutputStream byteStream = new ByteArrayOutputStream(1024);
+		ObjectOutputStream objectOutputStream = new ObjectOutputStream(byteStream);
+		objectOutputStream.writeObject(authentication);
+		objectOutputStream.flush();
+	}
+
+	@Test
+	public void createDefaultAssertionValidatorWhenAssertionThenValidates() {
+		Response response = TestOpenSamlObjects.signedResponseWithOneAssertion();
+		Assertion assertion = response.getAssertions().get(0);
+		OpenSaml5AuthenticationProvider.AssertionToken assertionToken = new OpenSaml5AuthenticationProvider.AssertionToken(
+				assertion, token());
+		assertThat(
+				OpenSaml5AuthenticationProvider.createDefaultAssertionValidator().convert(assertionToken).hasErrors())
+			.isFalse();
+	}
+
+	@Test
+	public void authenticateWhenDelegatingToDefaultAssertionValidatorThenUses() {
+		OpenSaml5AuthenticationProvider provider = new OpenSaml5AuthenticationProvider();
+		// @formatter:off
+		provider.setAssertionValidator((assertionToken) -> OpenSaml5AuthenticationProvider
+				.createDefaultAssertionValidator((token) -> new ValidationContext())
+				.convert(assertionToken)
+				.concat(new Saml2Error("wrong error", "wrong error"))
+		);
+		// @formatter:on
+		Response response = response();
+		Assertion assertion = assertion();
+		OneTimeUse oneTimeUse = build(OneTimeUse.DEFAULT_ELEMENT_NAME);
+		assertion.getConditions().getConditions().add(oneTimeUse);
+		response.getAssertions().add(assertion);
+		Saml2AuthenticationToken token = token(signed(response), verifying(registration()));
+		// @formatter:off
+		assertThatExceptionOfType(Saml2AuthenticationException.class)
+				.isThrownBy(() -> provider.authenticate(token)).isInstanceOf(Saml2AuthenticationException.class)
+				.satisfies((error) -> assertThat(error.getSaml2Error().getErrorCode()).isEqualTo(Saml2ErrorCodes.INVALID_ASSERTION));
+		// @formatter:on
+	}
+
+	// gh-11675
+	@Test
+	public void authenticateWhenUsingCustomAssertionValidatorThenUses() {
+		OpenSaml5AuthenticationProvider provider = new OpenSaml5AuthenticationProvider();
+		Consumer<Map<String, Object>> validationParameters = mock(Consumer.class);
+		// @formatter:off
+		provider.setAssertionValidator(OpenSaml5AuthenticationProvider
+				.createDefaultAssertionValidatorWithParameters(validationParameters));
+		// @formatter:on
+		Response response = response();
+		Assertion assertion = assertion();
+		OneTimeUse oneTimeUse = build(OneTimeUse.DEFAULT_ELEMENT_NAME);
+		assertion.getConditions().getConditions().add(oneTimeUse);
+		response.getAssertions().add(assertion);
+		Saml2AuthenticationToken token = token(signed(response), verifying(registration()));
+		provider.authenticate(token);
+		verify(validationParameters).accept(any());
+	}
+
+	@Test
+	public void authenticateWhenCustomAssertionValidatorThenUses() {
+		Converter<OpenSaml5AuthenticationProvider.AssertionToken, Saml2ResponseValidatorResult> validator = mock(
+				Converter.class);
+		OpenSaml5AuthenticationProvider provider = new OpenSaml5AuthenticationProvider();
+		// @formatter:off
+		provider.setAssertionValidator((assertionToken) -> OpenSaml5AuthenticationProvider.createDefaultAssertionValidator()
+				.convert(assertionToken)
+				.concat(validator.convert(assertionToken))
+		);
+		// @formatter:on
+		Response response = response();
+		Assertion assertion = assertion();
+		response.getAssertions().add(assertion);
+		Saml2AuthenticationToken token = token(signed(response), verifying(registration()));
+		given(validator.convert(any(OpenSaml5AuthenticationProvider.AssertionToken.class)))
+			.willReturn(Saml2ResponseValidatorResult.success());
+		provider.authenticate(token);
+		verify(validator).convert(any(OpenSaml5AuthenticationProvider.AssertionToken.class));
+	}
+
+	@Test
+	public void authenticateWhenDefaultConditionValidatorNotUsedThenSignatureStillChecked() {
+		OpenSaml5AuthenticationProvider provider = new OpenSaml5AuthenticationProvider();
+		provider.setAssertionValidator((assertionToken) -> Saml2ResponseValidatorResult.success());
+		Response response = response();
+		Assertion assertion = assertion();
+		TestOpenSamlObjects.signed(assertion, TestSaml2X509Credentials.relyingPartyDecryptingCredential(),
+				RELYING_PARTY_ENTITY_ID); // broken
+		// signature
+		response.getAssertions().add(assertion);
+		Saml2AuthenticationToken token = token(signed(response), verifying(registration()));
+		// @formatter:off
+		assertThatExceptionOfType(Saml2AuthenticationException.class)
+				.isThrownBy(() -> provider.authenticate(token))
+				.satisfies((error) -> assertThat(error.getSaml2Error().getErrorCode()).isEqualTo(Saml2ErrorCodes.INVALID_SIGNATURE));
+		// @formatter:on
+	}
+
+	@Test
+	public void authenticateWhenValidationContextCustomizedThenUsers() {
+		Map<String, Object> parameters = new HashMap<>();
+		parameters.put(SAML2AssertionValidationParameters.SC_VALID_RECIPIENTS, Collections.singleton("blah"));
+		ValidationContext context = mock(ValidationContext.class);
+		given(context.getStaticParameters()).willReturn(parameters);
+		OpenSaml5AuthenticationProvider provider = new OpenSaml5AuthenticationProvider();
+		provider.setAssertionValidator(
+				OpenSaml5AuthenticationProvider.createDefaultAssertionValidator((assertionToken) -> context));
+		Response response = response();
+		Assertion assertion = assertion();
+		response.getAssertions().add(signed(assertion));
+		Saml2AuthenticationToken token = token(response, verifying(registration()));
+		// @formatter:off
+		assertThatExceptionOfType(Saml2AuthenticationException.class)
+				.isThrownBy(() -> provider.authenticate(token)).isInstanceOf(Saml2AuthenticationException.class)
+				.satisfies((error) -> assertThat(error).hasMessageContaining("Invalid assertion"));
+		// @formatter:on
+		verify(context, atLeastOnce()).getStaticParameters();
+	}
+
+	@Test
+	public void authenticateWithSHA1SignatureThenItSucceeds() throws Exception {
+		Response response = response();
+		Assertion assertion = TestOpenSamlObjects.signed(assertion(),
+				TestSaml2X509Credentials.assertingPartySigningCredential(), RELYING_PARTY_ENTITY_ID,
+				SignatureConstants.ALGO_ID_SIGNATURE_RSA_SHA1);
+		response.getAssertions().add(assertion);
+		Saml2AuthenticationToken token = token(response, verifying(registration()));
+		this.provider.authenticate(token);
+	}
+
+	@Test
+	public void setAssertionValidatorWhenNullThenIllegalArgument() {
+		// @formatter:off
+		assertThatIllegalArgumentException()
+				.isThrownBy(() -> this.provider.setAssertionValidator(null));
+		// @formatter:on
+	}
+
+	@Test
+	public void createDefaultResponseAuthenticationConverterWhenResponseThenConverts() {
+		Response response = TestOpenSamlObjects.signedResponseWithOneAssertion();
+		Saml2AuthenticationToken token = token(response, verifying(registration()));
+		ResponseToken responseToken = new ResponseToken(response, token);
+		Saml2Authentication authentication = OpenSaml5AuthenticationProvider
+			.createDefaultResponseAuthenticationConverter()
+			.convert(responseToken);
+		assertThat(authentication.getName()).isEqualTo("test@saml.user");
+	}
+
+	@Test
+	public void authenticateWhenResponseAuthenticationConverterConfiguredThenUses() {
+		Converter<ResponseToken, Saml2Authentication> authenticationConverter = mock(Converter.class);
+		OpenSaml5AuthenticationProvider provider = new OpenSaml5AuthenticationProvider();
+		provider.setResponseAuthenticationConverter(authenticationConverter);
+		Response response = TestOpenSamlObjects.signedResponseWithOneAssertion();
+		Saml2AuthenticationToken token = token(response, verifying(registration()));
+		provider.authenticate(token);
+		verify(authenticationConverter).convert(any());
+	}
+
+	@Test
+	public void setResponseAuthenticationConverterWhenNullThenIllegalArgument() {
+		// @formatter:off
+		assertThatIllegalArgumentException()
+				.isThrownBy(() -> this.provider.setResponseAuthenticationConverter(null));
+		// @formatter:on
+	}
+
+	@Test
+	public void setResponseElementsDecrypterWhenNullThenIllegalArgument() {
+		assertThatIllegalArgumentException().isThrownBy(() -> this.provider.setResponseElementsDecrypter(null));
+	}
+
+	@Test
+	public void setAssertionElementsDecrypterWhenNullThenIllegalArgument() {
+		assertThatIllegalArgumentException().isThrownBy(() -> this.provider.setAssertionElementsDecrypter(null));
+	}
+
+	@Test
+	public void authenticateWhenCustomResponseElementsDecrypterThenDecryptsResponse() {
+		Response response = response();
+		Assertion assertion = assertion();
+		response.getEncryptedAssertions().add(new EncryptedAssertionBuilder().buildObject());
+		TestOpenSamlObjects.signed(response, TestSaml2X509Credentials.assertingPartySigningCredential(),
+				RELYING_PARTY_ENTITY_ID);
+		Saml2AuthenticationToken token = token(response, verifying(registration()));
+		this.provider
+			.setResponseElementsDecrypter((tuple) -> tuple.getResponse().getAssertions().add(signed(assertion)));
+		Authentication authentication = this.provider.authenticate(token);
+		assertThat(authentication.getName()).isEqualTo("test@saml.user");
+	}
+
+	@Test
+	public void authenticateWhenCustomAssertionElementsDecrypterThenDecryptsAssertion() {
+		Response response = response();
+		Assertion assertion = assertion();
+		EncryptedID id = new EncryptedIDBuilder().buildObject();
+		id.setEncryptedData(new EncryptedDataBuilder().buildObject());
+		assertion.getSubject().setEncryptedID(id);
+		response.getAssertions().add(signed(assertion));
+		Saml2AuthenticationToken token = token(response, verifying(registration()));
+		this.provider.setAssertionElementsDecrypter((tuple) -> {
+			NameID name = new NameIDBuilder().buildObject();
+			name.setValue("decrypted name");
+			tuple.getAssertion().getSubject().setNameID(name);
+		});
+		Authentication authentication = this.provider.authenticate(token);
+		assertThat(authentication.getName()).isEqualTo("decrypted name");
+	}
+
+	@Test
+	public void authenticateWhenResponseStatusIsNotSuccessThenFails() {
+		Response response = TestOpenSamlObjects
+			.signedResponseWithOneAssertion((r) -> r.setStatus(TestOpenSamlObjects.status(StatusCode.AUTHN_FAILED)));
+		Saml2AuthenticationToken token = token(response, verifying(registration()));
+		assertThatExceptionOfType(Saml2AuthenticationException.class)
+			.isThrownBy(() -> this.provider.authenticate(token))
+			.satisfies(errorOf(Saml2ErrorCodes.INVALID_RESPONSE, "Invalid status"));
+	}
+
+	@Test
+	public void authenticateWhenResponseStatusIsSuccessThenSucceeds() {
+		Response response = TestOpenSamlObjects
+			.signedResponseWithOneAssertion((r) -> r.setStatus(TestOpenSamlObjects.successStatus()));
+		Saml2AuthenticationToken token = token(response, verifying(registration()));
+		Authentication authentication = this.provider.authenticate(token);
+		assertThat(authentication.getName()).isEqualTo("test@saml.user");
+	}
+
+	@Test
+	public void setResponseValidatorWhenNullThenIllegalArgument() {
+		assertThatIllegalArgumentException().isThrownBy(() -> this.provider.setResponseValidator(null));
+	}
+
+	@Test
+	public void authenticateWhenCustomResponseValidatorThenUses() {
+		Converter<OpenSaml5AuthenticationProvider.ResponseToken, Saml2ResponseValidatorResult> validator = mock(
+				Converter.class);
+		OpenSaml5AuthenticationProvider provider = new OpenSaml5AuthenticationProvider();
+		// @formatter:off
+		provider.setResponseValidator((responseToken) -> OpenSaml5AuthenticationProvider.createDefaultResponseValidator()
+				.convert(responseToken)
+				.concat(validator.convert(responseToken))
+		);
+		// @formatter:on
+		Response response = response();
+		Assertion assertion = assertion();
+		response.getAssertions().add(assertion);
+		Saml2AuthenticationToken token = token(signed(response), verifying(registration()));
+		given(validator.convert(any(OpenSaml5AuthenticationProvider.ResponseToken.class)))
+			.willReturn(Saml2ResponseValidatorResult.success());
+		provider.authenticate(token);
+		verify(validator).convert(any(OpenSaml5AuthenticationProvider.ResponseToken.class));
+	}
+
+	@Test
+	public void authenticateWhenResponseStatusIsNotSuccessThenOnlyReturnParentStatusCodes() {
+		Saml2AuthenticationToken token = TestSaml2AuthenticationTokens.token();
+
+		Status parentStatus = new StatusBuilder().buildObject();
+		StatusCode parentStatusCode = new StatusCodeBuilder().buildObject();
+		parentStatusCode.setValue(StatusCode.AUTHN_FAILED);
+		StatusCode childStatusCode = new StatusCodeBuilder().buildObject();
+		childStatusCode.setValue(StatusCode.NO_PASSIVE);
+		parentStatusCode.setStatusCode(childStatusCode);
+		parentStatus.setStatusCode(parentStatusCode);
+
+		Response response = TestOpenSamlObjects.response();
+		response.setStatus(parentStatus);
+		response.setIssuer(TestOpenSamlObjects.issuer("mockedIssuer"));
+
+		Converter<ResponseToken, Saml2ResponseValidatorResult> validator = OpenSaml5AuthenticationProvider
+			.createDefaultResponseValidator();
+		Saml2ResponseValidatorResult result = validator.convert(new ResponseToken(response, token));
+
+		String expectedErrorMessage = String.format("Invalid status [%s] for SAML response",
+				parentStatusCode.getValue());
+		assertThat(
+				result.getErrors().stream().anyMatch((error) -> error.getDescription().contains(expectedErrorMessage)))
+			.isTrue();
+		assertThat(result.getErrors()
+			.stream()
+			.noneMatch((error) -> error.getDescription().contains(childStatusCode.getValue()))).isTrue();
+	}
+
+	@Test
+	public void authenticateWhenResponseStatusIsNotSuccessThenReturnParentAndChildStatusCode() {
+		Saml2AuthenticationToken token = TestSaml2AuthenticationTokens.token();
+		Status parentStatus = new StatusBuilder().buildObject();
+		StatusCode parentStatusCode = new StatusCodeBuilder().buildObject();
+		parentStatusCode.setValue(StatusCode.REQUESTER);
+		StatusCode childStatusCode = new StatusCodeBuilder().buildObject();
+		childStatusCode.setValue(StatusCode.NO_PASSIVE);
+		parentStatusCode.setStatusCode(childStatusCode);
+		parentStatus.setStatusCode(parentStatusCode);
+
+		Response response = TestOpenSamlObjects.response();
+		response.setStatus(parentStatus);
+		response.setIssuer(TestOpenSamlObjects.issuer("mockedIssuer"));
+
+		Converter<ResponseToken, Saml2ResponseValidatorResult> validator = OpenSaml5AuthenticationProvider
+			.createDefaultResponseValidator();
+		Saml2ResponseValidatorResult result = validator.convert(new ResponseToken(response, token));
+
+		String expectedParentErrorMessage = String.format("Invalid status [%s] for SAML response",
+				parentStatusCode.getValue());
+		String expectedChildErrorMessage = String.format("Invalid status [%s] for SAML response",
+				childStatusCode.getValue());
+		assertThat(result.getErrors()
+			.stream()
+			.anyMatch((error) -> error.getDescription().contains(expectedParentErrorMessage))).isTrue();
+		assertThat(result.getErrors()
+			.stream()
+			.anyMatch((error) -> error.getDescription().contains(expectedChildErrorMessage))).isTrue();
+	}
+
+	@Test
+	public void authenticateWhenAssertionIssuerNotValidThenFailsWithInvalidIssuer() {
+		OpenSaml5AuthenticationProvider provider = new OpenSaml5AuthenticationProvider();
+		Response response = response();
+		Assertion assertion = assertion();
+		assertion.setIssuer(TestOpenSamlObjects.issuer("https://invalid.idp.test/saml2/idp"));
+		response.getAssertions().add(assertion);
+		Saml2AuthenticationToken token = token(signed(response), verifying(registration()));
+		assertThatExceptionOfType(Saml2AuthenticationException.class).isThrownBy(() -> provider.authenticate(token))
+			.withMessageContaining("did not match any valid issuers");
+	}
+
+	// gh-14931
+	@Test
+	public void authenticateWhenAssertionHasProxyRestrictionThenParses() {
+		OpenSaml5AuthenticationProvider provider = new OpenSaml5AuthenticationProvider();
+		Response response = response();
+		Assertion assertion = assertion();
+		ProxyRestriction condition = new ProxyRestrictionBuilder().buildObject();
+		assertion.getConditions().getConditions().add(condition);
+		response.getAssertions().add(assertion);
+		Saml2AuthenticationToken token = token(signed(response), verifying(registration()));
+		provider.authenticate(token);
+	}
+
+	// gh-15022
+	@Test
+	public void authenticateWhenClockSkewThenVerifiesSignature() {
+		OpenSaml5AuthenticationProvider provider = new OpenSaml5AuthenticationProvider();
+		provider.setAssertionValidator(OpenSaml5AuthenticationProvider.createDefaultAssertionValidatorWithParameters(
+				(params) -> params.put(SAML2AssertionValidationParameters.CLOCK_SKEW, Duration.ofMinutes(10))));
+		Response response = response();
+		Assertion assertion = assertion();
+		assertion.setIssueInstant(Instant.now().plus(Duration.ofMinutes(9)));
+		response.getAssertions().add(assertion);
+		Saml2AuthenticationToken token = token(signed(response), verifying(registration()));
+		provider.authenticate(token);
+	}
+
+	private <T extends XMLObject> T build(QName qName) {
+		return (T) XMLObjectProviderRegistrySupport.getBuilderFactory().getBuilder(qName).buildObject(qName);
+	}
+
+	private String serialize(XMLObject object) {
+		return this.saml.serialize(object).serialize();
+	}
+
+	private Consumer<Saml2AuthenticationException> errorOf(String errorCode) {
+		return errorOf(errorCode, null);
+	}
+
+	private Consumer<Saml2AuthenticationException> errorOf(String errorCode, String description) {
+		return (ex) -> {
+			assertThat(ex.getSaml2Error().getErrorCode()).isEqualTo(errorCode);
+			if (StringUtils.hasText(description)) {
+				assertThat(ex.getSaml2Error().getDescription()).contains(description);
+			}
+		};
+	}
+
+	private Response response() {
+		Response response = TestOpenSamlObjects.response();
+		response.setIssueInstant(Instant.now());
+		return response;
+	}
+
+	private Response response(String destination, String issuerEntityId) {
+		Response response = TestOpenSamlObjects.response(destination, issuerEntityId);
+		response.setIssueInstant(Instant.now());
+		return response;
+	}
+
+	private Assertion assertion(String inResponseTo) {
+		Assertion assertion = TestOpenSamlObjects.assertion();
+		assertion.setIssueInstant(Instant.now());
+		for (SubjectConfirmation confirmation : assertion.getSubject().getSubjectConfirmations()) {
+			SubjectConfirmationData data = confirmation.getSubjectConfirmationData();
+			data.setNotBefore(Instant.now().minus(Duration.ofMillis(5 * 60 * 1000)));
+			data.setNotOnOrAfter(Instant.now().plus(Duration.ofMillis(5 * 60 * 1000)));
+			if (StringUtils.hasText(inResponseTo)) {
+				data.setInResponseTo(inResponseTo);
+			}
+		}
+		Conditions conditions = assertion.getConditions();
+		conditions.setNotBefore(Instant.now().minus(Duration.ofMillis(5 * 60 * 1000)));
+		conditions.setNotOnOrAfter(Instant.now().plus(Duration.ofMillis(5 * 60 * 1000)));
+		return assertion;
+	}
+
+	private Assertion assertion() {
+		return assertion(null);
+	}
+
+	private <T extends SignableSAMLObject> T signed(T toSign) {
+		TestOpenSamlObjects.signed(toSign, TestSaml2X509Credentials.assertingPartySigningCredential(),
+				RELYING_PARTY_ENTITY_ID);
+		return toSign;
+	}
+
+	private List<AttributeStatement> attributeStatements() {
+		List<AttributeStatement> attributeStatements = TestOpenSamlObjects.attributeStatements();
+		AttributeBuilder attributeBuilder = new AttributeBuilder();
+		Attribute registeredDateAttr = attributeBuilder.buildObject();
+		registeredDateAttr.setName("registeredDate");
+		XSDateTime registeredDate = new XSDateTimeBuilder().buildObject(AttributeValue.DEFAULT_ELEMENT_NAME,
+				XSDateTime.TYPE_NAME);
+		registeredDate.setValue(Instant.parse("1970-01-01T00:00:00Z"));
+		registeredDateAttr.getAttributeValues().add(registeredDate);
+		attributeStatements.iterator().next().getAttributes().add(registeredDateAttr);
+		return attributeStatements;
+	}
+
+	private Saml2AuthenticationToken token() {
+		Response response = response();
+		RelyingPartyRegistration registration = verifying(registration()).build();
+		return new Saml2AuthenticationToken(registration, serialize(response));
+	}
+
+	private Saml2AuthenticationToken token(Response response, RelyingPartyRegistration.Builder registration) {
+		return new Saml2AuthenticationToken(registration.build(), serialize(response));
+	}
+
+	private Saml2AuthenticationToken token(Response response, RelyingPartyRegistration.Builder registration,
+			AbstractSaml2AuthenticationRequest authenticationRequest) {
+		return new Saml2AuthenticationToken(registration.build(), serialize(response), authenticationRequest);
+	}
+
+	private AbstractSaml2AuthenticationRequest mockedStoredAuthenticationRequest(String requestId) {
+		AbstractSaml2AuthenticationRequest mockAuthenticationRequest = mock(AbstractSaml2AuthenticationRequest.class);
+		given(mockAuthenticationRequest.getId()).willReturn(requestId);
+		return mockAuthenticationRequest;
+	}
+
+	private RelyingPartyRegistration.Builder registration() {
+		return TestRelyingPartyRegistrations.noCredentials()
+			.entityId(RELYING_PARTY_ENTITY_ID)
+			.assertionConsumerServiceLocation(DESTINATION)
+			.assertingPartyDetails((party) -> party.entityId(ASSERTING_PARTY_ENTITY_ID));
+	}
+
+	private RelyingPartyRegistration.Builder verifying(RelyingPartyRegistration.Builder builder) {
+		return builder.assertingPartyDetails((party) -> party
+			.verificationX509Credentials((c) -> c.add(TestSaml2X509Credentials.relyingPartyVerifyingCredential())));
+	}
+
+	private RelyingPartyRegistration.Builder decrypting(RelyingPartyRegistration.Builder builder) {
+		return builder
+			.decryptionX509Credentials((c) -> c.add(TestSaml2X509Credentials.relyingPartyDecryptingCredential()));
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Test/java/org/springframework/security/saml2/provider/service/authentication/TestCustomOpenSaml5Objects.java

@@ -0,0 +1,213 @@
+/*
+ * Copyright 2002-2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.authentication;
+
+import java.util.Collections;
+import java.util.List;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+import javax.xml.namespace.QName;
+
+import net.shibboleth.shared.xml.ElementSupport;
+import org.opensaml.core.xml.AbstractXMLObject;
+import org.opensaml.core.xml.AbstractXMLObjectBuilder;
+import org.opensaml.core.xml.ElementExtensibleXMLObject;
+import org.opensaml.core.xml.Namespace;
+import org.opensaml.core.xml.XMLObject;
+import org.opensaml.core.xml.config.XMLObjectProviderRegistrySupport;
+import org.opensaml.core.xml.io.AbstractXMLObjectMarshaller;
+import org.opensaml.core.xml.io.AbstractXMLObjectUnmarshaller;
+import org.opensaml.core.xml.io.UnmarshallingException;
+import org.opensaml.core.xml.schema.XSAny;
+import org.opensaml.core.xml.schema.impl.XSAnyBuilder;
+import org.opensaml.core.xml.util.IndexedXMLObjectChildrenList;
+import org.opensaml.saml.common.xml.SAMLConstants;
+import org.opensaml.saml.saml2.core.AttributeValue;
+import org.w3c.dom.Element;
+
+import org.springframework.security.saml2.core.OpenSamlInitializationService;
+
+public final class TestCustomOpenSaml5Objects {
+
+	static {
+		OpenSamlInitializationService.initialize();
+		XMLObjectProviderRegistrySupport.getMarshallerFactory()
+			.registerMarshaller(CustomOpenSamlObject.TYPE_NAME,
+					new TestCustomOpenSaml5Objects.CustomSamlObjectMarshaller());
+		XMLObjectProviderRegistrySupport.getUnmarshallerFactory()
+			.registerUnmarshaller(CustomOpenSamlObject.TYPE_NAME,
+					new TestCustomOpenSaml5Objects.CustomSamlObjectUnmarshaller());
+	}
+
+	public static CustomOpenSamlObject instance() {
+		CustomOpenSamlObject samlObject = new TestCustomOpenSaml5Objects.CustomSamlObjectBuilder()
+			.buildObject(AttributeValue.DEFAULT_ELEMENT_NAME, CustomOpenSamlObject.TYPE_NAME);
+		XSAny street = new XSAnyBuilder().buildObject(CustomOpenSamlObject.CUSTOM_NS, "Street",
+				CustomOpenSamlObject.TYPE_CUSTOM_PREFIX);
+		street.setTextContent("Test Street");
+		samlObject.getUnknownXMLObjects().add(street);
+		XSAny streetNumber = new XSAnyBuilder().buildObject(CustomOpenSamlObject.CUSTOM_NS, "Number",
+				CustomOpenSamlObject.TYPE_CUSTOM_PREFIX);
+		streetNumber.setTextContent("1");
+		samlObject.getUnknownXMLObjects().add(streetNumber);
+		XSAny zip = new XSAnyBuilder().buildObject(CustomOpenSamlObject.CUSTOM_NS, "ZIP",
+				CustomOpenSamlObject.TYPE_CUSTOM_PREFIX);
+		zip.setTextContent("11111");
+		samlObject.getUnknownXMLObjects().add(zip);
+		XSAny city = new XSAnyBuilder().buildObject(CustomOpenSamlObject.CUSTOM_NS, "City",
+				CustomOpenSamlObject.TYPE_CUSTOM_PREFIX);
+		city.setTextContent("Test City");
+		samlObject.getUnknownXMLObjects().add(city);
+		return samlObject;
+	}
+
+	private TestCustomOpenSaml5Objects() {
+
+	}
+
+	public interface CustomOpenSamlObject extends ElementExtensibleXMLObject {
+
+		String TYPE_LOCAL_NAME = "CustomType";
+
+		String TYPE_CUSTOM_PREFIX = "custom";
+
+		String CUSTOM_NS = "https://custom.com/schema/custom";
+
+		/** QName of the CustomType type. */
+		QName TYPE_NAME = new QName(CUSTOM_NS, TYPE_LOCAL_NAME, TYPE_CUSTOM_PREFIX);
+
+		String getStreet();
+
+		String getStreetNumber();
+
+		String getZIP();
+
+		String getCity();
+
+	}
+
+	public static class CustomOpenSamlObjectImpl extends AbstractXMLObject implements CustomOpenSamlObject {
+
+		@Nonnull
+		private IndexedXMLObjectChildrenList<XMLObject> unknownXMLObjects;
+
+		/**
+		 * Constructor.
+		 * @param namespaceURI the namespace the element is in
+		 * @param elementLocalName the local name of the XML element this Object
+		 * represents
+		 * @param namespacePrefix the prefix for the given namespace
+		 */
+		protected CustomOpenSamlObjectImpl(@Nullable String namespaceURI, @Nonnull String elementLocalName,
+				@Nullable String namespacePrefix) {
+			super(namespaceURI, elementLocalName, namespacePrefix);
+			super.getNamespaceManager().registerNamespaceDeclaration(new Namespace(CUSTOM_NS, TYPE_CUSTOM_PREFIX));
+			this.unknownXMLObjects = new IndexedXMLObjectChildrenList<>(this);
+		}
+
+		@Nonnull
+		@Override
+		public List<XMLObject> getUnknownXMLObjects() {
+			return this.unknownXMLObjects;
+		}
+
+		@Nonnull
+		@Override
+		public List<XMLObject> getUnknownXMLObjects(@Nonnull QName typeOrName) {
+			return (List<XMLObject>) this.unknownXMLObjects.subList(typeOrName);
+		}
+
+		@Nullable
+		@Override
+		public List<XMLObject> getOrderedChildren() {
+			return Collections.unmodifiableList(this.unknownXMLObjects);
+		}
+
+		@Override
+		public String getStreet() {
+			return ((XSAny) getOrderedChildren().get(0)).getTextContent();
+		}
+
+		@Override
+		public String getStreetNumber() {
+			return ((XSAny) getOrderedChildren().get(1)).getTextContent();
+		}
+
+		@Override
+		public String getZIP() {
+			return ((XSAny) getOrderedChildren().get(2)).getTextContent();
+		}
+
+		@Override
+		public String getCity() {
+			return ((XSAny) getOrderedChildren().get(3)).getTextContent();
+		}
+
+	}
+
+	public static class CustomSamlObjectBuilder extends AbstractXMLObjectBuilder<CustomOpenSamlObject> {
+
+		@Nonnull
+		@Override
+		public CustomOpenSamlObject buildObject(@Nullable String namespaceURI, @Nonnull String localName,
+				@Nullable String namespacePrefix) {
+			return new CustomOpenSamlObjectImpl(namespaceURI, localName, namespacePrefix);
+		}
+
+	}
+
+	public static class CustomSamlObjectMarshaller extends AbstractXMLObjectMarshaller {
+
+		public CustomSamlObjectMarshaller() {
+			super();
+		}
+
+		@Override
+		protected void marshallElementContent(@Nonnull XMLObject xmlObject, @Nonnull Element domElement) {
+			final CustomOpenSamlObject customSamlObject = (CustomOpenSamlObject) xmlObject;
+
+			for (XMLObject object : customSamlObject.getOrderedChildren()) {
+				ElementSupport.appendChildElement(domElement, object.getDOM());
+			}
+		}
+
+	}
+
+	public static class CustomSamlObjectUnmarshaller extends AbstractXMLObjectUnmarshaller {
+
+		public CustomSamlObjectUnmarshaller() {
+			super();
+		}
+
+		@Override
+		protected void processChildElement(@Nonnull XMLObject parentXMLObject, @Nonnull XMLObject childXMLObject)
+				throws UnmarshallingException {
+			final CustomOpenSamlObject customSamlObject = (CustomOpenSamlObject) parentXMLObject;
+			customSamlObject.getUnknownXMLObjects().add(childXMLObject);
+		}
+
+		@Nonnull
+		@Override
+		protected XMLObject buildXMLObject(@Nonnull Element domElement) {
+			return new CustomOpenSamlObjectImpl(SAMLConstants.SAML20_NS, AttributeValue.DEFAULT_ELEMENT_LOCAL_NAME,
+					CustomOpenSamlObject.TYPE_CUSTOM_PREFIX);
+		}
+
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Test/java/org/springframework/security/saml2/provider/service/authentication/logout/OpenSaml5LogoutRequestValidatorTests.java

@@ -0,0 +1,223 @@
+/*
+ * Copyright 2002-2021 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.authentication.logout;
+
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+import org.opensaml.core.xml.XMLObject;
+import org.opensaml.saml.saml2.core.LogoutRequest;
+
+import org.springframework.security.core.Authentication;
+import org.springframework.security.saml2.core.Saml2ErrorCodes;
+import org.springframework.security.saml2.core.Saml2ParameterNames;
+import org.springframework.security.saml2.core.TestSaml2X509Credentials;
+import org.springframework.security.saml2.provider.service.authentication.DefaultSaml2AuthenticatedPrincipal;
+import org.springframework.security.saml2.provider.service.authentication.Saml2Authentication;
+import org.springframework.security.saml2.provider.service.authentication.TestOpenSamlObjects;
+import org.springframework.security.saml2.provider.service.authentication.logout.OpenSamlOperations.SignatureConfigurer;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistration;
+import org.springframework.security.saml2.provider.service.registration.Saml2MessageBinding;
+import org.springframework.security.saml2.provider.service.registration.TestRelyingPartyRegistrations;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link OpenSaml5LogoutRequestValidator}
+ *
+ * @author Josh Cummings
+ */
+public class OpenSaml5LogoutRequestValidatorTests {
+
+	private final OpenSamlOperations saml = new OpenSaml5Template();
+
+	private final OpenSaml5LogoutRequestValidator validator = new OpenSaml5LogoutRequestValidator();
+
+	@Test
+	public void handleWhenPostBindingThenValidates() {
+		RelyingPartyRegistration registration = registration().build();
+		LogoutRequest logoutRequest = TestOpenSamlObjects.assertingPartyLogoutRequest(registration);
+		sign(logoutRequest, registration);
+		Saml2LogoutRequest request = post(logoutRequest, registration);
+		Saml2LogoutRequestValidatorParameters parameters = new Saml2LogoutRequestValidatorParameters(request,
+				registration, authentication(registration));
+		Saml2LogoutValidatorResult result = this.validator.validate(parameters);
+		assertThat(result.hasErrors()).isFalse();
+	}
+
+	@Test
+	public void handleWhenNameIdIsEncryptedIdPostThenValidates() {
+
+		RelyingPartyRegistration registration = decrypting(encrypting(registration())).build();
+		LogoutRequest logoutRequest = TestOpenSamlObjects.assertingPartyLogoutRequestNameIdInEncryptedId(registration);
+		sign(logoutRequest, registration);
+		Saml2LogoutRequest request = post(logoutRequest, registration);
+		Saml2LogoutRequestValidatorParameters parameters = new Saml2LogoutRequestValidatorParameters(request,
+				registration, authentication(registration));
+		Saml2LogoutValidatorResult result = this.validator.validate(parameters);
+		assertThat(result.hasErrors()).withFailMessage(() -> result.getErrors().toString()).isFalse();
+
+	}
+
+	@Test
+	public void handleWhenRedirectBindingThenValidatesSignatureParameter() {
+		RelyingPartyRegistration registration = registration()
+			.assertingPartyDetails((party) -> party.singleLogoutServiceBinding(Saml2MessageBinding.REDIRECT))
+			.build();
+		LogoutRequest logoutRequest = TestOpenSamlObjects.assertingPartyLogoutRequest(registration);
+		Saml2LogoutRequest request = redirect(logoutRequest, registration,
+				this.saml.withSigningKeys(registration.getSigningX509Credentials()));
+		Saml2LogoutRequestValidatorParameters parameters = new Saml2LogoutRequestValidatorParameters(request,
+				registration, authentication(registration));
+		Saml2LogoutValidatorResult result = this.validator.validate(parameters);
+		assertThat(result.hasErrors()).isFalse();
+	}
+
+	@Test
+	public void handleWhenInvalidIssuerThenInvalidSignatureError() {
+		RelyingPartyRegistration registration = registration().build();
+		LogoutRequest logoutRequest = TestOpenSamlObjects.assertingPartyLogoutRequest(registration);
+		logoutRequest.getIssuer().setValue("wrong");
+		sign(logoutRequest, registration);
+		Saml2LogoutRequest request = post(logoutRequest, registration);
+		Saml2LogoutRequestValidatorParameters parameters = new Saml2LogoutRequestValidatorParameters(request,
+				registration, authentication(registration));
+		Saml2LogoutValidatorResult result = this.validator.validate(parameters);
+		assertThat(result.hasErrors()).isTrue();
+		assertThat(result.getErrors().iterator().next().getErrorCode()).isEqualTo(Saml2ErrorCodes.INVALID_SIGNATURE);
+	}
+
+	@Test
+	public void handleWhenMismatchedUserThenInvalidRequestError() {
+		RelyingPartyRegistration registration = registration().build();
+		LogoutRequest logoutRequest = TestOpenSamlObjects.assertingPartyLogoutRequest(registration);
+		logoutRequest.getNameID().setValue("wrong");
+		sign(logoutRequest, registration);
+		Saml2LogoutRequest request = post(logoutRequest, registration);
+		Saml2LogoutRequestValidatorParameters parameters = new Saml2LogoutRequestValidatorParameters(request,
+				registration, authentication(registration));
+		Saml2LogoutValidatorResult result = this.validator.validate(parameters);
+		assertThat(result.hasErrors()).isTrue();
+		assertThat(result.getErrors().iterator().next().getErrorCode()).isEqualTo(Saml2ErrorCodes.INVALID_REQUEST);
+	}
+
+	@Test
+	public void handleWhenMissingUserThenSubjectNotFoundError() {
+		RelyingPartyRegistration registration = registration().build();
+		LogoutRequest logoutRequest = TestOpenSamlObjects.assertingPartyLogoutRequest(registration);
+		logoutRequest.setNameID(null);
+		sign(logoutRequest, registration);
+		Saml2LogoutRequest request = post(logoutRequest, registration);
+		Saml2LogoutRequestValidatorParameters parameters = new Saml2LogoutRequestValidatorParameters(request,
+				registration, authentication(registration));
+		Saml2LogoutValidatorResult result = this.validator.validate(parameters);
+		assertThat(result.hasErrors()).isTrue();
+		assertThat(result.getErrors().iterator().next().getErrorCode()).isEqualTo(Saml2ErrorCodes.SUBJECT_NOT_FOUND);
+	}
+
+	@Test
+	public void handleWhenMismatchedDestinationThenInvalidDestinationError() {
+		RelyingPartyRegistration registration = registration().build();
+		LogoutRequest logoutRequest = TestOpenSamlObjects.assertingPartyLogoutRequest(registration);
+		logoutRequest.setDestination("wrong");
+		sign(logoutRequest, registration);
+		Saml2LogoutRequest request = post(logoutRequest, registration);
+		Saml2LogoutRequestValidatorParameters parameters = new Saml2LogoutRequestValidatorParameters(request,
+				registration, authentication(registration));
+		Saml2LogoutValidatorResult result = this.validator.validate(parameters);
+		assertThat(result.hasErrors()).isTrue();
+		assertThat(result.getErrors().iterator().next().getErrorCode()).isEqualTo(Saml2ErrorCodes.INVALID_DESTINATION);
+	}
+
+	// gh-10923
+	@Test
+	public void handleWhenLogoutResponseHasLineBreaksThenHandles() {
+		RelyingPartyRegistration registration = registration().build();
+		LogoutRequest logoutRequest = TestOpenSamlObjects.assertingPartyLogoutRequest(registration);
+		sign(logoutRequest, registration);
+		String encoded = new StringBuffer(
+				Saml2Utils.samlEncode(serialize(logoutRequest).getBytes(StandardCharsets.UTF_8)))
+			.insert(10, "\r\n")
+			.toString();
+		Saml2LogoutRequest request = Saml2LogoutRequest.withRelyingPartyRegistration(registration)
+			.samlRequest(encoded)
+			.build();
+		Saml2LogoutRequestValidatorParameters parameters = new Saml2LogoutRequestValidatorParameters(request,
+				registration, authentication(registration));
+		Saml2LogoutValidatorResult result = this.validator.validate(parameters);
+		assertThat(result.hasErrors()).isFalse();
+	}
+
+	private RelyingPartyRegistration.Builder registration() {
+		return signing(verifying(TestRelyingPartyRegistrations.noCredentials()))
+			.assertingPartyDetails((party) -> party.singleLogoutServiceBinding(Saml2MessageBinding.POST));
+	}
+
+	private RelyingPartyRegistration.Builder decrypting(RelyingPartyRegistration.Builder builder) {
+		return builder
+			.decryptionX509Credentials((c) -> c.add(TestSaml2X509Credentials.relyingPartyDecryptingCredential()));
+	}
+
+	private RelyingPartyRegistration.Builder encrypting(RelyingPartyRegistration.Builder builder) {
+		return builder.assertingPartyDetails((party) -> party
+			.encryptionX509Credentials((c) -> c.add(TestSaml2X509Credentials.assertingPartyEncryptingCredential())));
+	}
+
+	private RelyingPartyRegistration.Builder verifying(RelyingPartyRegistration.Builder builder) {
+		return builder.assertingPartyDetails((party) -> party
+			.verificationX509Credentials((c) -> c.add(TestSaml2X509Credentials.relyingPartyVerifyingCredential())));
+	}
+
+	private RelyingPartyRegistration.Builder signing(RelyingPartyRegistration.Builder builder) {
+		return builder.signingX509Credentials((c) -> c.add(TestSaml2X509Credentials.assertingPartySigningCredential()));
+	}
+
+	private Authentication authentication(RelyingPartyRegistration registration) {
+		DefaultSaml2AuthenticatedPrincipal principal = new DefaultSaml2AuthenticatedPrincipal("user", new HashMap<>());
+		principal.setRelyingPartyRegistrationId(registration.getRegistrationId());
+		return new Saml2Authentication(principal, "response", new ArrayList<>());
+	}
+
+	private Saml2LogoutRequest post(LogoutRequest logoutRequest, RelyingPartyRegistration registration) {
+		return Saml2LogoutRequest.withRelyingPartyRegistration(registration)
+			.samlRequest(Saml2Utils.samlEncode(serialize(logoutRequest).getBytes(StandardCharsets.UTF_8)))
+			.build();
+	}
+
+	private Saml2LogoutRequest redirect(LogoutRequest logoutRequest, RelyingPartyRegistration registration,
+			SignatureConfigurer configurer) {
+		String serialized = Saml2Utils.samlEncode(Saml2Utils.samlDeflate(serialize(logoutRequest)));
+		Map<String, String> parameters = configurer.sign(Map.of(Saml2ParameterNames.SAML_REQUEST, serialized));
+		return Saml2LogoutRequest.withRelyingPartyRegistration(registration)
+			.samlRequest(serialized)
+			.parameters((params) -> params.putAll(parameters))
+			.build();
+	}
+
+	private void sign(LogoutRequest logoutRequest, RelyingPartyRegistration registration) {
+		TestOpenSamlObjects.signed(logoutRequest, registration.getSigningX509Credentials().iterator().next(),
+				registration.getAssertingPartyDetails().getEntityId());
+	}
+
+	private String serialize(XMLObject object) {
+		return this.saml.serialize(object).serialize();
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Test/java/org/springframework/security/saml2/provider/service/authentication/logout/OpenSaml5LogoutResponseValidatorTests.java

@@ -0,0 +1,190 @@
+/*
+ * Copyright 2002-2021 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.authentication.logout;
+
+import java.nio.charset.StandardCharsets;
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+import org.opensaml.core.xml.XMLObject;
+import org.opensaml.saml.saml2.core.LogoutResponse;
+import org.opensaml.saml.saml2.core.StatusCode;
+
+import org.springframework.security.saml2.core.Saml2ErrorCodes;
+import org.springframework.security.saml2.core.Saml2ParameterNames;
+import org.springframework.security.saml2.core.TestSaml2X509Credentials;
+import org.springframework.security.saml2.provider.service.authentication.TestOpenSamlObjects;
+import org.springframework.security.saml2.provider.service.authentication.logout.OpenSamlOperations.SignatureConfigurer;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistration;
+import org.springframework.security.saml2.provider.service.registration.Saml2MessageBinding;
+import org.springframework.security.saml2.provider.service.registration.TestRelyingPartyRegistrations;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link OpenSaml5LogoutResponseValidator}
+ *
+ * @author Josh Cummings
+ */
+public class OpenSaml5LogoutResponseValidatorTests {
+
+	private final OpenSamlOperations saml = new OpenSaml5Template();
+
+	private final OpenSaml5LogoutResponseValidator manager = new OpenSaml5LogoutResponseValidator();
+
+	@Test
+	public void handleWhenAuthenticatedThenHandles() {
+		RelyingPartyRegistration registration = signing(verifying(registration())).build();
+		Saml2LogoutRequest logoutRequest = Saml2LogoutRequest.withRelyingPartyRegistration(registration)
+			.id("id")
+			.build();
+		LogoutResponse logoutResponse = TestOpenSamlObjects.assertingPartyLogoutResponse(registration);
+		sign(logoutResponse, registration);
+		Saml2LogoutResponse response = post(logoutResponse, registration);
+		Saml2LogoutResponseValidatorParameters parameters = new Saml2LogoutResponseValidatorParameters(response,
+				logoutRequest, registration);
+		this.manager.validate(parameters);
+	}
+
+	@Test
+	public void handleWhenRedirectBindingThenValidatesSignatureParameter() {
+		RelyingPartyRegistration registration = signing(verifying(registration()))
+			.assertingPartyDetails((party) -> party.singleLogoutServiceBinding(Saml2MessageBinding.REDIRECT))
+			.build();
+		Saml2LogoutRequest logoutRequest = Saml2LogoutRequest.withRelyingPartyRegistration(registration)
+			.id("id")
+			.build();
+		LogoutResponse logoutResponse = TestOpenSamlObjects.assertingPartyLogoutResponse(registration);
+		Saml2LogoutResponse response = redirect(logoutResponse, registration,
+				this.saml.withSigningKeys(registration.getSigningX509Credentials()));
+		Saml2LogoutResponseValidatorParameters parameters = new Saml2LogoutResponseValidatorParameters(response,
+				logoutRequest, registration);
+		this.manager.validate(parameters);
+	}
+
+	@Test
+	public void handleWhenInvalidIssuerThenInvalidSignatureError() {
+		RelyingPartyRegistration registration = registration().build();
+		Saml2LogoutRequest logoutRequest = Saml2LogoutRequest.withRelyingPartyRegistration(registration)
+			.id("id")
+			.build();
+		LogoutResponse logoutResponse = TestOpenSamlObjects.assertingPartyLogoutResponse(registration);
+		logoutResponse.getIssuer().setValue("wrong");
+		sign(logoutResponse, registration);
+		Saml2LogoutResponse response = post(logoutResponse, registration);
+		Saml2LogoutResponseValidatorParameters parameters = new Saml2LogoutResponseValidatorParameters(response,
+				logoutRequest, registration);
+		Saml2LogoutValidatorResult result = this.manager.validate(parameters);
+		assertThat(result.hasErrors()).isTrue();
+		assertThat(result.getErrors().iterator().next().getErrorCode()).isEqualTo(Saml2ErrorCodes.INVALID_SIGNATURE);
+	}
+
+	@Test
+	public void handleWhenMismatchedDestinationThenInvalidDestinationError() {
+		RelyingPartyRegistration registration = registration().build();
+		Saml2LogoutRequest logoutRequest = Saml2LogoutRequest.withRelyingPartyRegistration(registration)
+			.id("id")
+			.build();
+		LogoutResponse logoutResponse = TestOpenSamlObjects.assertingPartyLogoutResponse(registration);
+		logoutResponse.setDestination("wrong");
+		sign(logoutResponse, registration);
+		Saml2LogoutResponse response = post(logoutResponse, registration);
+		Saml2LogoutResponseValidatorParameters parameters = new Saml2LogoutResponseValidatorParameters(response,
+				logoutRequest, registration);
+		Saml2LogoutValidatorResult result = this.manager.validate(parameters);
+		assertThat(result.hasErrors()).isTrue();
+		assertThat(result.getErrors().iterator().next().getErrorCode()).isEqualTo(Saml2ErrorCodes.INVALID_DESTINATION);
+	}
+
+	@Test
+	public void handleWhenStatusNotSuccessThenInvalidResponseError() {
+		RelyingPartyRegistration registration = registration().build();
+		Saml2LogoutRequest logoutRequest = Saml2LogoutRequest.withRelyingPartyRegistration(registration)
+			.id("id")
+			.build();
+		LogoutResponse logoutResponse = TestOpenSamlObjects.assertingPartyLogoutResponse(registration);
+		logoutResponse.getStatus().getStatusCode().setValue(StatusCode.UNKNOWN_PRINCIPAL);
+		sign(logoutResponse, registration);
+		Saml2LogoutResponse response = post(logoutResponse, registration);
+		Saml2LogoutResponseValidatorParameters parameters = new Saml2LogoutResponseValidatorParameters(response,
+				logoutRequest, registration);
+		Saml2LogoutValidatorResult result = this.manager.validate(parameters);
+		assertThat(result.hasErrors()).isTrue();
+		assertThat(result.getErrors().iterator().next().getErrorCode()).isEqualTo(Saml2ErrorCodes.INVALID_RESPONSE);
+	}
+
+	// gh-10923
+	@Test
+	public void handleWhenLogoutResponseHasLineBreaksThenHandles() {
+		RelyingPartyRegistration registration = signing(verifying(registration())).build();
+		Saml2LogoutRequest logoutRequest = Saml2LogoutRequest.withRelyingPartyRegistration(registration)
+			.id("id")
+			.build();
+		LogoutResponse logoutResponse = TestOpenSamlObjects.assertingPartyLogoutResponse(registration);
+		sign(logoutResponse, registration);
+		String encoded = new StringBuilder(
+				Saml2Utils.samlEncode(serialize(logoutResponse).getBytes(StandardCharsets.UTF_8)))
+			.insert(10, "\r\n")
+			.toString();
+		Saml2LogoutResponse response = Saml2LogoutResponse.withRelyingPartyRegistration(registration)
+			.samlResponse(encoded)
+			.build();
+		Saml2LogoutResponseValidatorParameters parameters = new Saml2LogoutResponseValidatorParameters(response,
+				logoutRequest, registration);
+		this.manager.validate(parameters);
+	}
+
+	private RelyingPartyRegistration.Builder registration() {
+		return signing(verifying(TestRelyingPartyRegistrations.noCredentials()))
+			.assertingPartyDetails((party) -> party.singleLogoutServiceBinding(Saml2MessageBinding.POST));
+	}
+
+	private RelyingPartyRegistration.Builder verifying(RelyingPartyRegistration.Builder builder) {
+		return builder.assertingPartyDetails((party) -> party
+			.verificationX509Credentials((c) -> c.add(TestSaml2X509Credentials.relyingPartyVerifyingCredential())));
+	}
+
+	private RelyingPartyRegistration.Builder signing(RelyingPartyRegistration.Builder builder) {
+		return builder.signingX509Credentials((c) -> c.add(TestSaml2X509Credentials.assertingPartySigningCredential()));
+	}
+
+	private Saml2LogoutResponse post(LogoutResponse logoutResponse, RelyingPartyRegistration registration) {
+		return Saml2LogoutResponse.withRelyingPartyRegistration(registration)
+			.samlResponse(Saml2Utils.samlEncode(serialize(logoutResponse).getBytes(StandardCharsets.UTF_8)))
+			.build();
+	}
+
+	private Saml2LogoutResponse redirect(LogoutResponse logoutResponse, RelyingPartyRegistration registration,
+			SignatureConfigurer<?> configurer) {
+		String serialized = Saml2Utils.samlEncode(Saml2Utils.samlDeflate(serialize(logoutResponse)));
+		Map<String, String> parameters = configurer.sign(Map.of(Saml2ParameterNames.SAML_RESPONSE, serialized));
+		return Saml2LogoutResponse.withRelyingPartyRegistration(registration)
+			.samlResponse(serialized)
+			.parameters((params) -> params.putAll(parameters))
+			.build();
+	}
+
+	private void sign(LogoutResponse logoutResponse, RelyingPartyRegistration registration) {
+		TestOpenSamlObjects.signed(logoutResponse, registration.getSigningX509Credentials().iterator().next(),
+				registration.getAssertingPartyDetails().getEntityId());
+	}
+
+	private String serialize(XMLObject object) {
+		return this.saml.serialize(object).serialize();
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Test/java/org/springframework/security/saml2/provider/service/metadata/OpenSaml5MetadataResolverTests.java

@@ -0,0 +1,185 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.metadata;
+
+import java.util.List;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.security.saml2.core.TestSaml2X509Credentials;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistration;
+import org.springframework.security.saml2.provider.service.registration.Saml2MessageBinding;
+import org.springframework.security.saml2.provider.service.registration.TestRelyingPartyRegistrations;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link OpenSaml5MetadataResolver}
+ */
+public class OpenSaml5MetadataResolverTests {
+
+	@Test
+	public void resolveWhenRelyingPartyThenMetadataMatches() {
+		RelyingPartyRegistration relyingPartyRegistration = TestRelyingPartyRegistrations.full()
+			.assertionConsumerServiceBinding(Saml2MessageBinding.REDIRECT)
+			.build();
+		OpenSaml5MetadataResolver OpenSaml4MetadataResolver = new OpenSaml5MetadataResolver();
+		String metadata = OpenSaml4MetadataResolver.resolve(relyingPartyRegistration);
+		assertThat(metadata).contains("<md:EntityDescriptor")
+			.contains("entityID=\"rp-entity-id\"")
+			.contains("<md:KeyDescriptor use=\"signing\">")
+			.contains("<md:KeyDescriptor use=\"encryption\">")
+			.contains("<ds:X509Certificate>MIICgTCCAeoCCQCuVzyqFgMSyDANBgkqhkiG9w0BAQsFADCBhDELMAkGA1UEBh")
+			.contains("Binding=\"urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect\"")
+			.contains("Location=\"https://rp.example.org/acs\" index=\"1\"")
+			.contains("ResponseLocation=\"https://rp.example.org/logout/saml2/response\"");
+	}
+
+	@Test
+	public void resolveWhenRelyingPartyAndSignMetadataSetThenMetadataMatches() {
+		RelyingPartyRegistration relyingPartyRegistration = TestRelyingPartyRegistrations.full()
+			.assertionConsumerServiceBinding(Saml2MessageBinding.REDIRECT)
+			.build();
+		OpenSaml5MetadataResolver OpenSaml4MetadataResolver = new OpenSaml5MetadataResolver();
+		OpenSaml4MetadataResolver.setSignMetadata(true);
+		String metadata = OpenSaml4MetadataResolver.resolve(relyingPartyRegistration);
+		assertThat(metadata).contains("<md:EntityDescriptor")
+			.contains("entityID=\"rp-entity-id\"")
+			.contains("<md:KeyDescriptor use=\"signing\">")
+			.contains("<md:KeyDescriptor use=\"encryption\">")
+			.contains("<ds:X509Certificate>MIICgTCCAeoCCQCuVzyqFgMSyDANBgkqhkiG9w0BAQsFADCBhDELMAkGA1UEBh")
+			.contains("Binding=\"urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect\"")
+			.contains("Location=\"https://rp.example.org/acs\" index=\"1\"")
+			.contains("ResponseLocation=\"https://rp.example.org/logout/saml2/response\"")
+			.contains("Signature xmlns:ds=\"http://www.w3.org/2000/09/xmldsig#\"")
+			.contains("CanonicalizationMethod Algorithm=\"http://www.w3.org/2001/10/xml-exc-c14n#")
+			.contains("SignatureMethod Algorithm=\"http://www.w3.org/2001/04/xmldsig-more#rsa-sha256")
+			.contains("Reference URI=\"\"")
+			.contains("Transform Algorithm=\"http://www.w3.org/2000/09/xmldsig#enveloped-signature")
+			.contains("Transform Algorithm=\"http://www.w3.org/2001/10/xml-exc-c14n#\"")
+			.contains("DigestMethod Algorithm=\"http://www.w3.org/2001/04/xmlenc#sha256\"")
+			.contains("DigestValue")
+			.contains("SignatureValue");
+	}
+
+	@Test
+	public void resolveWhenRelyingPartyNoCredentialsThenMetadataMatches() {
+		RelyingPartyRegistration relyingPartyRegistration = TestRelyingPartyRegistrations.noCredentials()
+			.assertingPartyDetails((party) -> party
+				.verificationX509Credentials((c) -> c.add(TestSaml2X509Credentials.relyingPartyVerifyingCredential())))
+			.build();
+		OpenSaml5MetadataResolver OpenSaml4MetadataResolver = new OpenSaml5MetadataResolver();
+		String metadata = OpenSaml4MetadataResolver.resolve(relyingPartyRegistration);
+		assertThat(metadata).contains("<md:EntityDescriptor")
+			.contains("entityID=\"rp-entity-id\"")
+			.doesNotContain("<md:KeyDescriptor use=\"signing\">")
+			.doesNotContain("<md:KeyDescriptor use=\"encryption\">")
+			.contains("Binding=\"urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST\"")
+			.contains("Location=\"https://rp.example.org/acs\" index=\"1\"")
+			.contains("ResponseLocation=\"https://rp.example.org/logout/saml2/response\"");
+	}
+
+	@Test
+	public void resolveWhenRelyingPartyNameIDFormatThenMetadataMatches() {
+		RelyingPartyRegistration relyingPartyRegistration = TestRelyingPartyRegistrations.full()
+			.nameIdFormat("format")
+			.build();
+		OpenSaml5MetadataResolver OpenSaml4MetadataResolver = new OpenSaml5MetadataResolver();
+		String metadata = OpenSaml4MetadataResolver.resolve(relyingPartyRegistration);
+		assertThat(metadata).contains("<md:NameIDFormat>format</md:NameIDFormat>");
+	}
+
+	@Test
+	public void resolveWhenRelyingPartyNoLogoutThenMetadataMatches() {
+		RelyingPartyRegistration relyingPartyRegistration = TestRelyingPartyRegistrations.full()
+			.singleLogoutServiceLocation(null)
+			.nameIdFormat("format")
+			.build();
+		OpenSaml5MetadataResolver OpenSaml4MetadataResolver = new OpenSaml5MetadataResolver();
+		String metadata = OpenSaml4MetadataResolver.resolve(relyingPartyRegistration);
+		assertThat(metadata).doesNotContain("ResponseLocation");
+	}
+
+	@Test
+	public void resolveWhenEntityDescriptorCustomizerThenUses() {
+		RelyingPartyRegistration relyingPartyRegistration = TestRelyingPartyRegistrations.full()
+			.entityId("originalEntityId")
+			.build();
+		OpenSaml5MetadataResolver OpenSaml4MetadataResolver = new OpenSaml5MetadataResolver();
+		OpenSaml4MetadataResolver.setEntityDescriptorCustomizer(
+				(parameters) -> parameters.getEntityDescriptor().setEntityID("overriddenEntityId"));
+		String metadata = OpenSaml4MetadataResolver.resolve(relyingPartyRegistration);
+		assertThat(metadata).contains("<md:EntityDescriptor").contains("entityID=\"overriddenEntityId\"");
+	}
+
+	@Test
+	public void resolveIterableWhenRelyingPartiesThenMetadataMatches() {
+		RelyingPartyRegistration one = TestRelyingPartyRegistrations.full()
+			.assertionConsumerServiceBinding(Saml2MessageBinding.REDIRECT)
+			.build();
+		RelyingPartyRegistration two = TestRelyingPartyRegistrations.full()
+			.entityId("two")
+			.assertionConsumerServiceBinding(Saml2MessageBinding.REDIRECT)
+			.build();
+		OpenSaml5MetadataResolver OpenSaml4MetadataResolver = new OpenSaml5MetadataResolver();
+		String metadata = OpenSaml4MetadataResolver.resolve(List.of(one, two));
+		assertThat(metadata).contains("<md:EntitiesDescriptor")
+			.contains("<md:EntityDescriptor")
+			.contains("entityID=\"rp-entity-id\"")
+			.contains("entityID=\"two\"")
+			.contains("<md:KeyDescriptor use=\"signing\">")
+			.contains("<md:KeyDescriptor use=\"encryption\">")
+			.contains("<ds:X509Certificate>MIICgTCCAeoCCQCuVzyqFgMSyDANBgkqhkiG9w0BAQsFADCBhDELMAkGA1UEBh")
+			.contains("Binding=\"urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect\"")
+			.contains("Location=\"https://rp.example.org/acs\" index=\"1\"")
+			.contains("ResponseLocation=\"https://rp.example.org/logout/saml2/response\"");
+	}
+
+	@Test
+	public void resolveIterableWhenRelyingPartiesAndSignMetadataSetThenMetadataMatches() {
+		RelyingPartyRegistration one = TestRelyingPartyRegistrations.full()
+			.assertionConsumerServiceBinding(Saml2MessageBinding.REDIRECT)
+			.build();
+		RelyingPartyRegistration two = TestRelyingPartyRegistrations.full()
+			.entityId("two")
+			.assertionConsumerServiceBinding(Saml2MessageBinding.REDIRECT)
+			.build();
+		OpenSaml5MetadataResolver OpenSaml5MetadataResolver = new OpenSaml5MetadataResolver();
+		OpenSaml5MetadataResolver.setSignMetadata(true);
+		String metadata = OpenSaml5MetadataResolver.resolve(List.of(one, two));
+		assertThat(metadata).contains("<md:EntitiesDescriptor")
+			.contains("<md:EntityDescriptor")
+			.contains("entityID=\"rp-entity-id\"")
+			.contains("entityID=\"two\"")
+			.contains("<md:KeyDescriptor use=\"signing\">")
+			.contains("<md:KeyDescriptor use=\"encryption\">")
+			.contains("<ds:X509Certificate>MIICgTCCAeoCCQCuVzyqFgMSyDANBgkqhkiG9w0BAQsFADCBhDELMAkGA1UEBh")
+			.contains("Binding=\"urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect\"")
+			.contains("Location=\"https://rp.example.org/acs\" index=\"1\"")
+			.contains("ResponseLocation=\"https://rp.example.org/logout/saml2/response\"")
+			.contains("Signature xmlns:ds=\"http://www.w3.org/2000/09/xmldsig#\"")
+			.contains("CanonicalizationMethod Algorithm=\"http://www.w3.org/2001/10/xml-exc-c14n#")
+			.contains("SignatureMethod Algorithm=\"http://www.w3.org/2001/04/xmldsig-more#rsa-sha256")
+			.contains("Reference URI=\"\"")
+			.contains("Transform Algorithm=\"http://www.w3.org/2000/09/xmldsig#enveloped-signature")
+			.contains("Transform Algorithm=\"http://www.w3.org/2001/10/xml-exc-c14n#\"")
+			.contains("DigestMethod Algorithm=\"http://www.w3.org/2001/04/xmlenc#sha256\"")
+			.contains("DigestValue")
+			.contains("SignatureValue");
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Test/java/org/springframework/security/saml2/provider/service/registration/OpenSaml5AssertingPartyMetadataRepositoryTests.java

@@ -0,0 +1,379 @@
+/*
+ * Copyright 2002-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.registration;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.TimeUnit;
+import java.util.stream.Collectors;
+
+import net.shibboleth.shared.xml.SerializeSupport;
+import okhttp3.mockwebserver.Dispatcher;
+import okhttp3.mockwebserver.MockResponse;
+import okhttp3.mockwebserver.MockWebServer;
+import okhttp3.mockwebserver.RecordedRequest;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.opensaml.core.xml.XMLObject;
+import org.opensaml.core.xml.config.XMLObjectProviderRegistrySupport;
+import org.opensaml.core.xml.io.Marshaller;
+import org.opensaml.core.xml.io.MarshallingException;
+import org.opensaml.saml.metadata.IterableMetadataSource;
+import org.opensaml.saml.metadata.resolver.MetadataResolver;
+import org.opensaml.saml.metadata.resolver.impl.FilesystemMetadataResolver;
+import org.opensaml.saml.metadata.resolver.index.impl.RoleMetadataIndex;
+import org.opensaml.saml.saml2.metadata.EntityDescriptor;
+import org.opensaml.security.credential.Credential;
+import org.w3c.dom.Element;
+
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.core.io.ResourceLoader;
+import org.springframework.security.saml2.Saml2Exception;
+import org.springframework.security.saml2.core.OpenSamlInitializationService;
+import org.springframework.security.saml2.core.TestSaml2X509Credentials;
+import org.springframework.security.saml2.provider.service.authentication.TestOpenSamlObjects;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.withSettings;
+
+/**
+ * Tests for {@link BaseOpenSamlAssertingPartyMetadataRepository}
+ */
+public class OpenSaml5AssertingPartyMetadataRepositoryTests {
+
+	static {
+		OpenSamlInitializationService.initialize();
+	}
+
+	private String metadata;
+
+	private String entitiesDescriptor;
+
+	@BeforeEach
+	public void setup() throws Exception {
+		ClassPathResource resource = new ClassPathResource("test-metadata.xml");
+		try (BufferedReader reader = new BufferedReader(new InputStreamReader(resource.getInputStream()))) {
+			this.metadata = reader.lines().collect(Collectors.joining());
+		}
+		resource = new ClassPathResource("test-entitiesdescriptor.xml");
+		try (BufferedReader reader = new BufferedReader(new InputStreamReader(resource.getInputStream()))) {
+			this.entitiesDescriptor = reader.lines().collect(Collectors.joining());
+		}
+	}
+
+	@Test
+	public void withMetadataUrlLocationWhenResolvableThenFindByEntityIdReturns() throws Exception {
+		try (MockWebServer server = new MockWebServer()) {
+			server.setDispatcher(new AlwaysDispatch(this.metadata));
+			AssertingPartyMetadataRepository parties = OpenSaml5AssertingPartyMetadataRepository
+				.withTrustedMetadataLocation(server.url("/").toString())
+				.build();
+			AssertingPartyMetadata party = parties.findByEntityId("https://idp.example.com/idp/shibboleth");
+			assertThat(party.getEntityId()).isEqualTo("https://idp.example.com/idp/shibboleth");
+			assertThat(party.getSingleSignOnServiceLocation())
+				.isEqualTo("https://idp.example.com/idp/profile/SAML2/POST/SSO");
+			assertThat(party.getSingleSignOnServiceBinding()).isEqualTo(Saml2MessageBinding.POST);
+			assertThat(party.getVerificationX509Credentials()).hasSize(1);
+			assertThat(party.getEncryptionX509Credentials()).hasSize(1);
+		}
+	}
+
+	@Test
+	public void withMetadataUrlLocationnWhenResolvableThenIteratorReturns() throws Exception {
+		try (MockWebServer server = new MockWebServer()) {
+			server.setDispatcher(new AlwaysDispatch(this.entitiesDescriptor));
+			List<AssertingPartyMetadata> parties = new ArrayList<>();
+			OpenSaml5AssertingPartyMetadataRepository.withTrustedMetadataLocation(server.url("/").toString())
+				.build()
+				.iterator()
+				.forEachRemaining(parties::add);
+			assertThat(parties).hasSize(2);
+			assertThat(parties).extracting(AssertingPartyMetadata::getEntityId)
+				.contains("https://ap.example.org/idp/shibboleth", "https://idp.example.com/idp/shibboleth");
+		}
+	}
+
+	@Test
+	public void withMetadataUrlLocationWhenUnresolvableThenThrowsSaml2Exception() throws Exception {
+		try (MockWebServer server = new MockWebServer()) {
+			server.enqueue(new MockResponse().setBody(this.metadata).setResponseCode(200));
+			String url = server.url("/").toString();
+			server.shutdown();
+			assertThatExceptionOfType(Saml2Exception.class)
+				.isThrownBy(() -> OpenSaml5AssertingPartyMetadataRepository.withTrustedMetadataLocation(url).build());
+		}
+	}
+
+	@Test
+	public void withMetadataUrlLocationWhenMalformedResponseThenSaml2Exception() throws Exception {
+		try (MockWebServer server = new MockWebServer()) {
+			server.setDispatcher(new AlwaysDispatch("malformed"));
+			String url = server.url("/").toString();
+			assertThatExceptionOfType(Saml2Exception.class)
+				.isThrownBy(() -> OpenSaml5AssertingPartyMetadataRepository.withTrustedMetadataLocation(url).build());
+		}
+	}
+
+	@Test
+	public void fromMetadataFileLocationWhenResolvableThenFindByEntityIdReturns() {
+		File file = new File("src/test/resources/test-metadata.xml");
+		AssertingPartyMetadata party = OpenSaml5AssertingPartyMetadataRepository
+			.withTrustedMetadataLocation("file:" + file.getAbsolutePath())
+			.build()
+			.findByEntityId("https://idp.example.com/idp/shibboleth");
+		assertThat(party.getEntityId()).isEqualTo("https://idp.example.com/idp/shibboleth");
+		assertThat(party.getSingleSignOnServiceLocation())
+			.isEqualTo("https://idp.example.com/idp/profile/SAML2/POST/SSO");
+		assertThat(party.getSingleSignOnServiceBinding()).isEqualTo(Saml2MessageBinding.POST);
+		assertThat(party.getVerificationX509Credentials()).hasSize(1);
+		assertThat(party.getEncryptionX509Credentials()).hasSize(1);
+	}
+
+	@Test
+	public void fromMetadataFileLocationWhenResolvableThenIteratorReturns() {
+		File file = new File("src/test/resources/test-entitiesdescriptor.xml");
+		Collection<AssertingPartyMetadata> parties = new ArrayList<>();
+		OpenSaml5AssertingPartyMetadataRepository.withTrustedMetadataLocation("file:" + file.getAbsolutePath())
+			.build()
+			.iterator()
+			.forEachRemaining(parties::add);
+		assertThat(parties).hasSize(2);
+		assertThat(parties).extracting(AssertingPartyMetadata::getEntityId)
+			.contains("https://idp.example.com/idp/shibboleth", "https://ap.example.org/idp/shibboleth");
+	}
+
+	@Test
+	public void withMetadataFileLocationWhenNotFoundThenSaml2Exception() {
+		assertThatExceptionOfType(Saml2Exception.class).isThrownBy(
+				() -> OpenSaml5AssertingPartyMetadataRepository.withTrustedMetadataLocation("file:path").build());
+	}
+
+	@Test
+	public void fromMetadataClasspathLocationWhenResolvableThenFindByEntityIdReturns() {
+		AssertingPartyMetadata party = OpenSaml5AssertingPartyMetadataRepository
+			.withTrustedMetadataLocation("classpath:test-entitiesdescriptor.xml")
+			.build()
+			.findByEntityId("https://ap.example.org/idp/shibboleth");
+		assertThat(party.getEntityId()).isEqualTo("https://ap.example.org/idp/shibboleth");
+		assertThat(party.getSingleSignOnServiceLocation())
+			.isEqualTo("https://ap.example.org/idp/profile/SAML2/POST/SSO");
+		assertThat(party.getSingleSignOnServiceBinding()).isEqualTo(Saml2MessageBinding.POST);
+		assertThat(party.getVerificationX509Credentials()).hasSize(1);
+		assertThat(party.getEncryptionX509Credentials()).hasSize(1);
+	}
+
+	@Test
+	public void fromMetadataClasspathLocationWhenResolvableThenIteratorReturns() {
+		Collection<AssertingPartyMetadata> parties = new ArrayList<>();
+		OpenSaml5AssertingPartyMetadataRepository.withTrustedMetadataLocation("classpath:test-entitiesdescriptor.xml")
+			.build()
+			.iterator()
+			.forEachRemaining(parties::add);
+		assertThat(parties).hasSize(2);
+		assertThat(parties).extracting(AssertingPartyMetadata::getEntityId)
+			.contains("https://idp.example.com/idp/shibboleth", "https://ap.example.org/idp/shibboleth");
+	}
+
+	@Test
+	public void withMetadataClasspathLocationWhenNotFoundThenSaml2Exception() {
+		assertThatExceptionOfType(Saml2Exception.class).isThrownBy(
+				() -> OpenSaml5AssertingPartyMetadataRepository.withTrustedMetadataLocation("classpath:path").build());
+	}
+
+	@Test
+	public void withTrustedMetadataLocationWhenMatchingCredentialsThenVerifiesSignature() throws IOException {
+		RelyingPartyRegistration registration = TestRelyingPartyRegistrations.full().build();
+		EntityDescriptor descriptor = TestOpenSamlObjects.entityDescriptor(registration);
+		TestOpenSamlObjects.signed(descriptor, TestSaml2X509Credentials.assertingPartySigningCredential(),
+				descriptor.getEntityID());
+		String serialized = serialize(descriptor);
+		Credential credential = TestOpenSamlObjects
+			.getSigningCredential(TestSaml2X509Credentials.relyingPartyVerifyingCredential(), descriptor.getEntityID());
+		try (MockWebServer server = new MockWebServer()) {
+			server.start();
+			server.setDispatcher(new AlwaysDispatch(serialized));
+			AssertingPartyMetadataRepository parties = OpenSaml5AssertingPartyMetadataRepository
+				.withTrustedMetadataLocation(server.url("/").toString())
+				.verificationCredentials((c) -> c.add(credential))
+				.build();
+			assertThat(parties.findByEntityId(registration.getAssertingPartyDetails().getEntityId())).isNotNull();
+		}
+	}
+
+	@Test
+	public void withTrustedMetadataLocationWhenMismatchingCredentialsThenSaml2Exception() throws IOException {
+		RelyingPartyRegistration registration = TestRelyingPartyRegistrations.full().build();
+		EntityDescriptor descriptor = TestOpenSamlObjects.entityDescriptor(registration);
+		TestOpenSamlObjects.signed(descriptor, TestSaml2X509Credentials.relyingPartySigningCredential(),
+				descriptor.getEntityID());
+		String serialized = serialize(descriptor);
+		Credential credential = TestOpenSamlObjects
+			.getSigningCredential(TestSaml2X509Credentials.relyingPartyVerifyingCredential(), descriptor.getEntityID());
+		try (MockWebServer server = new MockWebServer()) {
+			server.start();
+			server.setDispatcher(new AlwaysDispatch(serialized));
+			assertThatExceptionOfType(Saml2Exception.class).isThrownBy(() -> OpenSaml5AssertingPartyMetadataRepository
+				.withTrustedMetadataLocation(server.url("/").toString())
+				.verificationCredentials((c) -> c.add(credential))
+				.build());
+		}
+	}
+
+	@Test
+	public void withTrustedMetadataLocationWhenNoCredentialsThenSkipsVerifySignature() throws IOException {
+		RelyingPartyRegistration registration = TestRelyingPartyRegistrations.full().build();
+		EntityDescriptor descriptor = TestOpenSamlObjects.entityDescriptor(registration);
+		TestOpenSamlObjects.signed(descriptor, TestSaml2X509Credentials.assertingPartySigningCredential(),
+				descriptor.getEntityID());
+		String serialized = serialize(descriptor);
+		try (MockWebServer server = new MockWebServer()) {
+			server.start();
+			server.setDispatcher(new AlwaysDispatch(serialized));
+			AssertingPartyMetadataRepository parties = OpenSaml5AssertingPartyMetadataRepository
+				.withTrustedMetadataLocation(server.url("/").toString())
+				.build();
+			assertThat(parties.findByEntityId(registration.getAssertingPartyDetails().getEntityId())).isNotNull();
+		}
+	}
+
+	@Test
+	public void withTrustedMetadataLocationWhenCustomResourceLoaderThenUses() {
+		ResourceLoader resourceLoader = mock(ResourceLoader.class);
+		given(resourceLoader.getResource(any())).willReturn(new ClassPathResource("test-metadata.xml"));
+		AssertingPartyMetadata party = OpenSaml5AssertingPartyMetadataRepository
+			.withTrustedMetadataLocation("classpath:wrong")
+			.resourceLoader(resourceLoader)
+			.build()
+			.iterator()
+			.next();
+		assertThat(party.getEntityId()).isEqualTo("https://idp.example.com/idp/shibboleth");
+		assertThat(party.getSingleSignOnServiceLocation())
+			.isEqualTo("https://idp.example.com/idp/profile/SAML2/POST/SSO");
+		assertThat(party.getSingleSignOnServiceBinding()).isEqualTo(Saml2MessageBinding.POST);
+		assertThat(party.getVerificationX509Credentials()).hasSize(1);
+		assertThat(party.getEncryptionX509Credentials()).hasSize(1);
+		verify(resourceLoader).getResource(any());
+	}
+
+	@Test
+	public void constructorWhenNoIndexAndNoIteratorThenException() {
+		MetadataResolver resolver = mock(MetadataResolver.class);
+		assertThatExceptionOfType(IllegalArgumentException.class)
+			.isThrownBy(() -> new OpenSaml5AssertingPartyMetadataRepository(resolver));
+	}
+
+	@Test
+	public void constructorWhenIterableResolverThenUses() {
+		RelyingPartyRegistration registration = TestRelyingPartyRegistrations.full().build();
+		EntityDescriptor descriptor = TestOpenSamlObjects.entityDescriptor(registration);
+		MetadataResolver resolver = mock(MetadataResolver.class,
+				withSettings().extraInterfaces(IterableMetadataSource.class));
+		given(((IterableMetadataSource) resolver).iterator()).willReturn(List.of(descriptor).iterator());
+		AssertingPartyMetadataRepository parties = new OpenSaml5AssertingPartyMetadataRepository(resolver);
+		parties.iterator()
+			.forEachRemaining((p) -> assertThat(p.getEntityId())
+				.isEqualTo(registration.getAssertingPartyDetails().getEntityId()));
+		verify(((IterableMetadataSource) resolver)).iterator();
+	}
+
+	@Test
+	public void constructorWhenIndexedResolverThenUses() throws Exception {
+		FilesystemMetadataResolver resolver = new FilesystemMetadataResolver(
+				new ClassPathResource("test-metadata.xml").getFile());
+		resolver.setIndexes(Set.of(new RoleMetadataIndex()));
+		resolver.setId("id");
+		resolver.setParserPool(XMLObjectProviderRegistrySupport.getParserPool());
+		resolver.initialize();
+		MetadataResolver spied = spy(resolver);
+		AssertingPartyMetadataRepository parties = new OpenSaml5AssertingPartyMetadataRepository(spied);
+		parties.iterator()
+			.forEachRemaining((p) -> assertThat(p.getEntityId()).isEqualTo("https://idp.example.com/idp/shibboleth"));
+		verify(spied).resolve(any());
+	}
+
+	@Test
+	public void withMetadataLocationWhenNoCredentialsThenException() {
+		assertThatExceptionOfType(IllegalArgumentException.class).isThrownBy(
+				() -> OpenSaml5AssertingPartyMetadataRepository.withMetadataLocation("classpath:test-metadata.xml")
+					.build());
+	}
+
+	@Test
+	public void withMetadataLocationWhenMatchingCredentialsThenVerifiesSignature() throws IOException {
+		RelyingPartyRegistration registration = TestRelyingPartyRegistrations.full().build();
+		EntityDescriptor descriptor = TestOpenSamlObjects.entityDescriptor(registration);
+		TestOpenSamlObjects.signed(descriptor, TestSaml2X509Credentials.assertingPartySigningCredential(),
+				descriptor.getEntityID());
+		String serialized = serialize(descriptor);
+		Credential credential = TestOpenSamlObjects
+			.getSigningCredential(TestSaml2X509Credentials.relyingPartyVerifyingCredential(), descriptor.getEntityID());
+		try (MockWebServer server = new MockWebServer()) {
+			server.start();
+			server.setDispatcher(new AlwaysDispatch(serialized));
+			AssertingPartyMetadataRepository parties = OpenSaml5AssertingPartyMetadataRepository
+				.withMetadataLocation(server.url("/").toString())
+				.verificationCredentials((c) -> c.add(credential))
+				.build();
+			assertThat(parties.findByEntityId(registration.getAssertingPartyDetails().getEntityId())).isNotNull();
+		}
+	}
+
+	private static String serialize(XMLObject object) {
+		try {
+			Marshaller marshaller = XMLObjectProviderRegistrySupport.getMarshallerFactory().getMarshaller(object);
+			Element element = marshaller.marshall(object);
+			return SerializeSupport.nodeToString(element);
+		}
+		catch (MarshallingException ex) {
+			throw new Saml2Exception(ex);
+		}
+	}
+
+	private static final class AlwaysDispatch extends Dispatcher {
+
+		private final MockResponse response;
+
+		private AlwaysDispatch(String body) {
+			this.response = new MockResponse().setBody(body)
+				.setResponseCode(200)
+				.setBodyDelay(1, TimeUnit.MILLISECONDS);
+		}
+
+		private AlwaysDispatch(MockResponse response) {
+			this.response = response;
+		}
+
+		@Override
+		public MockResponse dispatch(RecordedRequest recordedRequest) throws InterruptedException {
+			return this.response;
+		}
+
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Test/java/org/springframework/security/saml2/provider/service/web/OpenSaml5AuthenticationTokenConverterTests.java

@@ -0,0 +1,246 @@
+/*
+ * Copyright 2002-2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.web;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.time.Instant;
+
+import jakarta.servlet.http.HttpServletRequest;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.opensaml.core.xml.XMLObject;
+import org.opensaml.saml.common.SignableSAMLObject;
+import org.opensaml.saml.saml2.core.Response;
+
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.mock.web.MockHttpServletRequest;
+import org.springframework.security.saml2.core.Saml2ErrorCodes;
+import org.springframework.security.saml2.core.Saml2ParameterNames;
+import org.springframework.security.saml2.core.Saml2Utils;
+import org.springframework.security.saml2.core.TestSaml2X509Credentials;
+import org.springframework.security.saml2.provider.service.authentication.AbstractSaml2AuthenticationRequest;
+import org.springframework.security.saml2.provider.service.authentication.Saml2AuthenticationException;
+import org.springframework.security.saml2.provider.service.authentication.Saml2AuthenticationToken;
+import org.springframework.security.saml2.provider.service.authentication.TestOpenSamlObjects;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistration;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistrationRepository;
+import org.springframework.security.saml2.provider.service.registration.TestRelyingPartyRegistrations;
+import org.springframework.util.StreamUtils;
+import org.springframework.web.util.UriUtils;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
+import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.Mockito.mock;
+
+/**
+ * Tests for {@link OpenSaml5AuthenticationTokenConverter}
+ */
+@ExtendWith(MockitoExtension.class)
+public final class OpenSaml5AuthenticationTokenConverterTests {
+
+	@Mock
+	RelyingPartyRegistrationRepository registrations;
+
+	private final OpenSamlOperations saml = new OpenSaml5Template();
+
+	RelyingPartyRegistration registration = TestRelyingPartyRegistrations.relyingPartyRegistration().build();
+
+	@Test
+	public void convertWhenSamlResponseThenToken() {
+		OpenSaml5AuthenticationTokenConverter converter = new OpenSaml5AuthenticationTokenConverter(this.registrations);
+		given(this.registrations.findByRegistrationId(any())).willReturn(this.registration);
+		MockHttpServletRequest request = post("/login/saml2/sso/" + this.registration.getRegistrationId());
+		request.setParameter(Saml2ParameterNames.SAML_RESPONSE,
+				Saml2Utils.samlEncode("response".getBytes(StandardCharsets.UTF_8)));
+		Saml2AuthenticationToken token = converter.convert(request);
+		assertThat(token.getSaml2Response()).isEqualTo("response");
+		assertThat(token.getRelyingPartyRegistration().getRegistrationId())
+			.isEqualTo(this.registration.getRegistrationId());
+	}
+
+	@Test
+	public void convertWhenSamlResponseInvalidBase64ThenSaml2AuthenticationException() {
+		OpenSaml5AuthenticationTokenConverter converter = new OpenSaml5AuthenticationTokenConverter(this.registrations);
+		given(this.registrations.findByRegistrationId(any())).willReturn(this.registration);
+		MockHttpServletRequest request = post("/login/saml2/sso/" + this.registration.getRegistrationId());
+		request.setParameter(Saml2ParameterNames.SAML_RESPONSE, "invalid");
+		assertThatExceptionOfType(Saml2AuthenticationException.class).isThrownBy(() -> converter.convert(request))
+			.withCauseInstanceOf(IllegalArgumentException.class)
+			.satisfies(
+					(ex) -> assertThat(ex.getSaml2Error().getErrorCode()).isEqualTo(Saml2ErrorCodes.INVALID_RESPONSE))
+			.satisfies(
+					(ex) -> assertThat(ex.getSaml2Error().getDescription()).isEqualTo("Failed to decode SAMLResponse"));
+	}
+
+	@Test
+	public void convertWhenNoSamlResponseThenNull() {
+		OpenSaml5AuthenticationTokenConverter converter = new OpenSaml5AuthenticationTokenConverter(this.registrations);
+		MockHttpServletRequest request = post("/login/saml2/sso/" + this.registration.getRegistrationId());
+		assertThat(converter.convert(request)).isNull();
+	}
+
+	@Test
+	public void convertWhenNoMatchingRequestThenNull() {
+		OpenSaml5AuthenticationTokenConverter converter = new OpenSaml5AuthenticationTokenConverter(this.registrations);
+		MockHttpServletRequest request = new MockHttpServletRequest();
+		request.setParameter(Saml2ParameterNames.SAML_RESPONSE, "ignored");
+		assertThat(converter.convert(request)).isNull();
+	}
+
+	@Test
+	public void convertWhenNoRelyingPartyRegistrationThenNull() {
+		OpenSaml5AuthenticationTokenConverter converter = new OpenSaml5AuthenticationTokenConverter(this.registrations);
+		MockHttpServletRequest request = post("/login/saml2/sso/" + this.registration.getRegistrationId());
+		String response = Saml2Utils.samlEncode(serialize(signed(response())).getBytes(StandardCharsets.UTF_8));
+		request.setParameter(Saml2ParameterNames.SAML_RESPONSE, response);
+		assertThat(converter.convert(request)).isNull();
+	}
+
+	@Test
+	public void convertWhenGetRequestThenInflates() {
+		OpenSaml5AuthenticationTokenConverter converter = new OpenSaml5AuthenticationTokenConverter(this.registrations);
+		given(this.registrations.findByRegistrationId(any())).willReturn(this.registration);
+		MockHttpServletRequest request = get("/login/saml2/sso/" + this.registration.getRegistrationId());
+		byte[] deflated = Saml2Utils.samlDeflate("response");
+		String encoded = Saml2Utils.samlEncode(deflated);
+		request.setParameter(Saml2ParameterNames.SAML_RESPONSE, encoded);
+		Saml2AuthenticationToken token = converter.convert(request);
+		assertThat(token.getSaml2Response()).isEqualTo("response");
+		assertThat(token.getRelyingPartyRegistration().getRegistrationId())
+			.isEqualTo(this.registration.getRegistrationId());
+	}
+
+	@Test
+	public void convertWhenGetRequestInvalidDeflatedThenSaml2AuthenticationException() {
+		OpenSaml5AuthenticationTokenConverter converter = new OpenSaml5AuthenticationTokenConverter(this.registrations);
+		given(this.registrations.findByRegistrationId(any())).willReturn(this.registration);
+		MockHttpServletRequest request = get("/login/saml2/sso/" + this.registration.getRegistrationId());
+		byte[] invalidDeflated = "invalid".getBytes();
+		String encoded = Saml2Utils.samlEncode(invalidDeflated);
+		request.setParameter(Saml2ParameterNames.SAML_RESPONSE, encoded);
+		assertThatExceptionOfType(Saml2AuthenticationException.class).isThrownBy(() -> converter.convert(request))
+			.withRootCauseInstanceOf(IOException.class)
+			.satisfies(
+					(ex) -> assertThat(ex.getSaml2Error().getErrorCode()).isEqualTo(Saml2ErrorCodes.INVALID_RESPONSE))
+			.satisfies((ex) -> assertThat(ex.getSaml2Error().getDescription()).isEqualTo("Unable to inflate string"));
+	}
+
+	@Test
+	public void convertWhenUsingSamlUtilsBase64ThenXmlIsValid() throws Exception {
+		OpenSaml5AuthenticationTokenConverter converter = new OpenSaml5AuthenticationTokenConverter(this.registrations);
+		given(this.registrations.findByRegistrationId(any())).willReturn(this.registration);
+		MockHttpServletRequest request = post("/login/saml2/sso/" + this.registration.getRegistrationId());
+		request.setParameter(Saml2ParameterNames.SAML_RESPONSE, getSsoCircleEncodedXml());
+		Saml2AuthenticationToken token = converter.convert(request);
+		validateSsoCircleXml(token.getSaml2Response());
+	}
+
+	@Test
+	public void convertWhenSavedAuthenticationRequestThenToken() {
+		Saml2AuthenticationRequestRepository<AbstractSaml2AuthenticationRequest> authenticationRequestRepository = mock(
+				Saml2AuthenticationRequestRepository.class);
+		AbstractSaml2AuthenticationRequest authenticationRequest = mock(AbstractSaml2AuthenticationRequest.class);
+		given(authenticationRequest.getRelyingPartyRegistrationId()).willReturn(this.registration.getRegistrationId());
+		OpenSaml5AuthenticationTokenConverter converter = new OpenSaml5AuthenticationTokenConverter(this.registrations);
+		converter.setAuthenticationRequestRepository(authenticationRequestRepository);
+		given(this.registrations.findByRegistrationId(any())).willReturn(this.registration);
+		given(authenticationRequestRepository.loadAuthenticationRequest(any(HttpServletRequest.class)))
+			.willReturn(authenticationRequest);
+		MockHttpServletRequest request = post("/login/saml2/sso/" + this.registration.getRegistrationId());
+		request.setParameter(Saml2ParameterNames.SAML_RESPONSE,
+				Saml2Utils.samlEncode("response".getBytes(StandardCharsets.UTF_8)));
+		Saml2AuthenticationToken token = converter.convert(request);
+		assertThat(token.getSaml2Response()).isEqualTo("response");
+		assertThat(token.getRelyingPartyRegistration().getRegistrationId())
+			.isEqualTo(this.registration.getRegistrationId());
+		assertThat(token.getAuthenticationRequest()).isEqualTo(authenticationRequest);
+	}
+
+	@Test
+	public void convertWhenMatchingNoRegistrationIdThenLooksUpByAssertingEntityId() {
+		OpenSaml5AuthenticationTokenConverter converter = new OpenSaml5AuthenticationTokenConverter(this.registrations);
+		String response = serialize(signed(response()));
+		String encoded = Saml2Utils.samlEncode(response.getBytes(StandardCharsets.UTF_8));
+		given(this.registrations.findUniqueByAssertingPartyEntityId(TestOpenSamlObjects.ASSERTING_PARTY_ENTITY_ID))
+			.willReturn(this.registration);
+		MockHttpServletRequest request = post("/login/saml2/sso");
+		request.setParameter(Saml2ParameterNames.SAML_RESPONSE, encoded);
+		Saml2AuthenticationToken token = converter.convert(request);
+		assertThat(token.getSaml2Response()).isEqualTo(response);
+		assertThat(token.getRelyingPartyRegistration().getRegistrationId())
+			.isEqualTo(this.registration.getRegistrationId());
+	}
+
+	@Test
+	public void constructorWhenResolverIsNullThenIllegalArgument() {
+		assertThatIllegalArgumentException().isThrownBy(() -> new Saml2AuthenticationTokenConverter(null));
+	}
+
+	@Test
+	public void setAuthenticationRequestRepositoryWhenNullThenIllegalArgument() {
+		OpenSaml5AuthenticationTokenConverter converter = new OpenSaml5AuthenticationTokenConverter(this.registrations);
+		assertThatExceptionOfType(IllegalArgumentException.class)
+			.isThrownBy(() -> converter.setAuthenticationRequestRepository(null));
+	}
+
+	private void validateSsoCircleXml(String xml) {
+		assertThat(xml).contains("InResponseTo=\"ARQ9a73ead-7dcf-45a8-89eb-26f3c9900c36\"")
+			.contains(" ID=\"s246d157446618e90e43fb79bdd4d9e9e19cf2c7c4\"")
+			.contains("<saml:Issuer>https://idp.ssocircle.com</saml:Issuer>");
+	}
+
+	private String getSsoCircleEncodedXml() throws IOException {
+		ClassPathResource resource = new ClassPathResource("saml2-response-sso-circle.encoded");
+		String response = StreamUtils.copyToString(resource.getInputStream(), StandardCharsets.UTF_8);
+		return UriUtils.decode(response, StandardCharsets.UTF_8);
+	}
+
+	private MockHttpServletRequest post(String uri) {
+		MockHttpServletRequest request = new MockHttpServletRequest("POST", uri);
+		request.setServletPath(uri);
+		return request;
+	}
+
+	private MockHttpServletRequest get(String uri) {
+		MockHttpServletRequest request = new MockHttpServletRequest("GET", uri);
+		request.setServletPath(uri);
+		return request;
+	}
+
+	private <T extends SignableSAMLObject> T signed(T toSign) {
+		TestOpenSamlObjects.signed(toSign, TestSaml2X509Credentials.assertingPartySigningCredential(),
+				TestOpenSamlObjects.RELYING_PARTY_ENTITY_ID);
+		return toSign;
+	}
+
+	private Response response() {
+		Response response = TestOpenSamlObjects.response();
+		response.setIssueInstant(Instant.now());
+		return response;
+	}
+
+	private String serialize(XMLObject object) {
+		return this.saml.serialize(object).serialize();
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Test/java/org/springframework/security/saml2/provider/service/web/authentication/OpenSaml5AuthenticationRequestResolverTests.java

@@ -0,0 +1,110 @@
+/*
+ * Copyright 2002-2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.web.authentication;
+
+import jakarta.servlet.http.HttpServletRequest;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.core.convert.converter.Converter;
+import org.springframework.mock.web.MockHttpServletRequest;
+import org.springframework.security.saml2.provider.service.authentication.Saml2PostAuthenticationRequest;
+import org.springframework.security.saml2.provider.service.authentication.Saml2RedirectAuthenticationRequest;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistration;
+import org.springframework.security.saml2.provider.service.registration.Saml2MessageBinding;
+import org.springframework.security.saml2.provider.service.registration.TestRelyingPartyRegistrations;
+import org.springframework.security.saml2.provider.service.web.RelyingPartyRegistrationResolver;
+import org.springframework.security.web.util.matcher.AntPathRequestMatcher;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+
+public class OpenSaml5AuthenticationRequestResolverTests {
+
+	MockHttpServletRequest request;
+
+	RelyingPartyRegistration registration;
+
+	@BeforeEach
+	void setup() {
+		this.request = givenRequest("/saml2/authenticate/registration-id");
+		this.registration = TestRelyingPartyRegistrations.full().build();
+	}
+
+	@Test
+	void resolveWhenRedirectThenSaml2RedirectAuthenticationRequest() {
+		RelyingPartyRegistrationResolver relyingParties = mock(RelyingPartyRegistrationResolver.class);
+		given(relyingParties.resolve(any(), any())).willReturn(this.registration);
+		OpenSaml5AuthenticationRequestResolver resolver = new OpenSaml5AuthenticationRequestResolver(relyingParties);
+		Saml2RedirectAuthenticationRequest authnRequest = resolver.resolve(this.request);
+		assertThat(authnRequest.getBinding()).isEqualTo(Saml2MessageBinding.REDIRECT);
+		assertThat(authnRequest.getAuthenticationRequestUri())
+			.isEqualTo(this.registration.getAssertingPartyDetails().getSingleSignOnServiceLocation());
+	}
+
+	@Test
+	void resolveWhenPostThenSaml2PostAuthenticationRequest() {
+		RelyingPartyRegistration registration = TestRelyingPartyRegistrations.full()
+			.assertingPartyDetails((party) -> party.singleSignOnServiceBinding(Saml2MessageBinding.POST))
+			.build();
+		RelyingPartyRegistrationResolver relyingParties = mock(RelyingPartyRegistrationResolver.class);
+		given(relyingParties.resolve(any(), any())).willReturn(registration);
+		OpenSaml5AuthenticationRequestResolver resolver = new OpenSaml5AuthenticationRequestResolver(relyingParties);
+		Saml2PostAuthenticationRequest authnRequest = resolver.resolve(this.request);
+		assertThat(authnRequest.getBinding()).isEqualTo(Saml2MessageBinding.POST);
+		assertThat(authnRequest.getAuthenticationRequestUri())
+			.isEqualTo(this.registration.getAssertingPartyDetails().getSingleSignOnServiceLocation());
+	}
+
+	@Test
+	void resolveWhenCustomRelayStateThenUses() {
+		RelyingPartyRegistrationResolver relyingParties = mock(RelyingPartyRegistrationResolver.class);
+		given(relyingParties.resolve(any(), any())).willReturn(this.registration);
+		Converter<HttpServletRequest, String> relayState = mock(Converter.class);
+		given(relayState.convert(any())).willReturn("state");
+		OpenSaml5AuthenticationRequestResolver resolver = new OpenSaml5AuthenticationRequestResolver(relyingParties);
+		resolver.setRelayStateResolver(relayState);
+		Saml2RedirectAuthenticationRequest authnRequest = resolver.resolve(this.request);
+		assertThat(authnRequest.getRelayState()).isEqualTo("state");
+		verify(relayState).convert(any());
+	}
+
+	@Test
+	void resolveWhenCustomAuthenticationUrlTHenUses() {
+		RelyingPartyRegistrationResolver relyingParties = mock(RelyingPartyRegistrationResolver.class);
+		given(relyingParties.resolve(any(), any())).willReturn(this.registration);
+		OpenSaml5AuthenticationRequestResolver resolver = new OpenSaml5AuthenticationRequestResolver(relyingParties);
+		resolver.setRequestMatcher(new AntPathRequestMatcher("/custom/authentication/{registrationId}"));
+		Saml2RedirectAuthenticationRequest authnRequest = resolver
+			.resolve(givenRequest("/custom/authentication/registration-id"));
+
+		assertThat(authnRequest.getBinding()).isEqualTo(Saml2MessageBinding.REDIRECT);
+		assertThat(authnRequest.getAuthenticationRequestUri())
+			.isEqualTo(this.registration.getAssertingPartyDetails().getSingleSignOnServiceLocation());
+
+	}
+
+	private MockHttpServletRequest givenRequest(String path) {
+		MockHttpServletRequest request = new MockHttpServletRequest();
+		request.setServletPath(path);
+		return request;
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Test/java/org/springframework/security/saml2/provider/service/web/authentication/OpenSaml5SigningUtilsTests.java

@@ -0,0 +1,93 @@
+/*
+ * Copyright 2002-2021 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.web.authentication;
+
+import java.util.UUID;
+
+import javax.xml.namespace.QName;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.opensaml.core.xml.XMLObject;
+import org.opensaml.core.xml.config.XMLObjectProviderRegistrySupport;
+import org.opensaml.saml.common.SAMLVersion;
+import org.opensaml.saml.saml2.core.Issuer;
+import org.opensaml.saml.saml2.core.Response;
+import org.opensaml.xmlsec.signature.Signature;
+
+import org.springframework.security.saml2.core.OpenSamlInitializationService;
+import org.springframework.security.saml2.core.TestSaml2X509Credentials;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistration;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Test open SAML signatures
+ */
+public class OpenSaml5SigningUtilsTests {
+
+	static {
+		OpenSamlInitializationService.initialize();
+	}
+
+	private final OpenSamlOperations saml = new OpenSaml5Template();
+
+	private RelyingPartyRegistration registration;
+
+	@BeforeEach
+	public void setup() {
+		this.registration = RelyingPartyRegistration.withRegistrationId("saml-idp")
+			.entityId("https://some.idp.example.com/entity-id")
+			.signingX509Credentials((c) -> {
+				c.add(TestSaml2X509Credentials.relyingPartySigningCredential());
+				c.add(TestSaml2X509Credentials.assertingPartySigningCredential());
+			})
+			.assertingPartyDetails((c) -> c.entityId("https://some.idp.example.com/entity-id")
+				.singleSignOnServiceLocation("https://some.idp.example.com/service-location"))
+			.build();
+	}
+
+	@Test
+	public void whenSigningAnObjectThenKeyInfoIsPartOfTheSignature() {
+		Response response = response("destination", "issuer");
+		this.saml.withSigningKeys(this.registration.getSigningX509Credentials()).sign(response);
+		Signature signature = response.getSignature();
+		assertThat(signature).isNotNull();
+		assertThat(signature.getKeyInfo()).isNotNull();
+	}
+
+	Response response(String destination, String issuerEntityId) {
+		Response response = build(Response.DEFAULT_ELEMENT_NAME);
+		response.setID("R" + UUID.randomUUID());
+		response.setVersion(SAMLVersion.VERSION_20);
+		response.setID("_" + UUID.randomUUID());
+		response.setDestination(destination);
+		response.setIssuer(issuer(issuerEntityId));
+		return response;
+	}
+
+	Issuer issuer(String entityId) {
+		Issuer issuer = build(Issuer.DEFAULT_ELEMENT_NAME);
+		issuer.setValue(entityId);
+		return issuer;
+	}
+
+	<T extends XMLObject> T build(QName qName) {
+		return (T) XMLObjectProviderRegistrySupport.getBuilderFactory().getBuilder(qName).buildObject(qName);
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Test/java/org/springframework/security/saml2/provider/service/web/authentication/logout/OpenSaml5LogoutRequestResolverTests.java

@@ -0,0 +1,94 @@
+/*
+ * Copyright 2002-2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.web.authentication.logout;
+
+import jakarta.servlet.http.HttpServletRequest;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.core.convert.converter.Converter;
+import org.springframework.mock.web.MockHttpServletRequest;
+import org.springframework.security.authentication.TestingAuthenticationToken;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.saml2.provider.service.authentication.logout.Saml2LogoutRequest;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistration;
+import org.springframework.security.saml2.provider.service.registration.TestRelyingPartyRegistrations;
+import org.springframework.security.saml2.provider.service.web.RelyingPartyRegistrationResolver;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+
+/**
+ * Tests for {@link OpenSaml5LogoutRequestResolver}
+ */
+public class OpenSaml5LogoutRequestResolverTests {
+
+	RelyingPartyRegistration registration;
+
+	RelyingPartyRegistrationResolver registrationResolver;
+
+	OpenSaml5LogoutRequestResolver logoutRequestResolver;
+
+	@BeforeEach
+	public void setup() {
+		this.registration = TestRelyingPartyRegistrations.full().build();
+		this.registrationResolver = mock(RelyingPartyRegistrationResolver.class);
+		this.logoutRequestResolver = new OpenSaml5LogoutRequestResolver(this.registrationResolver);
+	}
+
+	@Test
+	public void resolveWhenCustomParametersConsumerThenUses() {
+		this.logoutRequestResolver.setParametersConsumer((parameters) -> parameters.getLogoutRequest().setID("myid"));
+		given(this.registrationResolver.resolve(any(), any())).willReturn(this.registration);
+
+		Saml2LogoutRequest logoutRequest = this.logoutRequestResolver.resolve(givenRequest(), givenAuthentication());
+
+		assertThat(logoutRequest.getId()).isEqualTo("myid");
+	}
+
+	@Test
+	public void setParametersConsumerWhenNullThenIllegalArgument() {
+		assertThatExceptionOfType(IllegalArgumentException.class)
+			.isThrownBy(() -> this.logoutRequestResolver.setParametersConsumer(null));
+	}
+
+	@Test
+	public void resolveWhenCustomRelayStateThenUses() {
+		given(this.registrationResolver.resolve(any(), any())).willReturn(this.registration);
+		Converter<HttpServletRequest, String> relayState = mock(Converter.class);
+		given(relayState.convert(any())).willReturn("any-state");
+		this.logoutRequestResolver.setRelayStateResolver(relayState);
+
+		Saml2LogoutRequest logoutRequest = this.logoutRequestResolver.resolve(givenRequest(), givenAuthentication());
+
+		assertThat(logoutRequest.getRelayState()).isEqualTo("any-state");
+		verify(relayState).convert(any());
+	}
+
+	private static Authentication givenAuthentication() {
+		return new TestingAuthenticationToken("user", "password");
+	}
+
+	private MockHttpServletRequest givenRequest() {
+		return new MockHttpServletRequest();
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Test/java/org/springframework/security/saml2/provider/service/web/authentication/logout/OpenSaml5LogoutRequestValidatorParametersResolverTests.java

@@ -0,0 +1,153 @@
+/*
+ * Copyright 2002-2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.web.authentication.logout;
+
+import java.nio.charset.StandardCharsets;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.opensaml.core.xml.XMLObject;
+
+import org.springframework.mock.web.MockHttpServletRequest;
+import org.springframework.security.authentication.TestingAuthenticationToken;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.saml2.core.Saml2ParameterNames;
+import org.springframework.security.saml2.provider.service.authentication.Saml2AuthenticationException;
+import org.springframework.security.saml2.provider.service.authentication.TestOpenSamlObjects;
+import org.springframework.security.saml2.provider.service.authentication.TestSaml2Authentications;
+import org.springframework.security.saml2.provider.service.authentication.logout.Saml2LogoutRequestValidatorParameters;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistration;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistrationRepository;
+import org.springframework.security.saml2.provider.service.registration.TestRelyingPartyRegistrations;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
+import static org.mockito.BDDMockito.given;
+
+@ExtendWith(MockitoExtension.class)
+public final class OpenSaml5LogoutRequestValidatorParametersResolverTests {
+
+	@Mock
+	RelyingPartyRegistrationRepository registrations;
+
+	private final OpenSamlOperations saml = new OpenSaml5Template();
+
+	private RelyingPartyRegistration registration = TestRelyingPartyRegistrations.relyingPartyRegistration().build();
+
+	private OpenSaml5LogoutRequestValidatorParametersResolver resolver;
+
+	@BeforeEach
+	void setup() {
+		this.resolver = new OpenSaml5LogoutRequestValidatorParametersResolver(this.registrations);
+	}
+
+	@Test
+	void saml2LogoutRegistrationIdResolveWhenMatchesThenParameters() {
+		String registrationId = this.registration.getRegistrationId();
+		MockHttpServletRequest request = post("/logout/saml2/slo/" + registrationId);
+		Authentication authentication = new TestingAuthenticationToken("user", "pass");
+		request.setParameter(Saml2ParameterNames.SAML_REQUEST, "request");
+		given(this.registrations.findByRegistrationId(registrationId)).willReturn(this.registration);
+		Saml2LogoutRequestValidatorParameters parameters = this.resolver.resolve(request, authentication);
+		assertThat(parameters.getAuthentication()).isEqualTo(authentication);
+		assertThat(parameters.getRelyingPartyRegistration().getRegistrationId()).isEqualTo(registrationId);
+		assertThat(parameters.getLogoutRequest().getSamlRequest()).isEqualTo("request");
+	}
+
+	@Test
+	void saml2LogoutRegistrationIdWhenUnauthenticatedThenParameters() {
+		String registrationId = this.registration.getRegistrationId();
+		MockHttpServletRequest request = post("/logout/saml2/slo/" + registrationId);
+		request.setParameter(Saml2ParameterNames.SAML_REQUEST, "request");
+		given(this.registrations.findByRegistrationId(registrationId)).willReturn(this.registration);
+		Saml2LogoutRequestValidatorParameters parameters = this.resolver.resolve(request, null);
+		assertThat(parameters.getAuthentication()).isNull();
+		assertThat(parameters.getRelyingPartyRegistration().getRegistrationId()).isEqualTo(registrationId);
+		assertThat(parameters.getLogoutRequest().getSamlRequest()).isEqualTo("request");
+	}
+
+	@Test
+	void saml2LogoutResolveWhenAuthenticatedThenParameters() {
+		String registrationId = this.registration.getRegistrationId();
+		MockHttpServletRequest request = post("/logout/saml2/slo");
+		Authentication authentication = TestSaml2Authentications.authentication();
+		request.setParameter(Saml2ParameterNames.SAML_REQUEST, "request");
+		given(this.registrations.findByRegistrationId(registrationId)).willReturn(this.registration);
+		Saml2LogoutRequestValidatorParameters parameters = this.resolver.resolve(request, authentication);
+		assertThat(parameters.getAuthentication()).isEqualTo(authentication);
+		assertThat(parameters.getRelyingPartyRegistration().getRegistrationId()).isEqualTo(registrationId);
+		assertThat(parameters.getLogoutRequest().getSamlRequest()).isEqualTo("request");
+	}
+
+	@Test
+	void saml2LogoutResolveWhenUnauthenticatedThenParameters() {
+		String registrationId = this.registration.getRegistrationId();
+		MockHttpServletRequest request = post("/logout/saml2/slo");
+		String logoutRequest = serialize(TestOpenSamlObjects.logoutRequest());
+		String encoded = Saml2Utils.samlEncode(logoutRequest.getBytes(StandardCharsets.UTF_8));
+		request.setParameter(Saml2ParameterNames.SAML_REQUEST, encoded);
+		given(this.registrations.findUniqueByAssertingPartyEntityId(TestOpenSamlObjects.ASSERTING_PARTY_ENTITY_ID))
+			.willReturn(this.registration);
+		Saml2LogoutRequestValidatorParameters parameters = this.resolver.resolve(request, null);
+		assertThat(parameters.getAuthentication()).isNull();
+		assertThat(parameters.getRelyingPartyRegistration().getRegistrationId()).isEqualTo(registrationId);
+		assertThat(parameters.getLogoutRequest().getSamlRequest()).isEqualTo(encoded);
+	}
+
+	@Test
+	void saml2LogoutResolveWhenUnauthenticatedGetRequestThenInflates() {
+		String registrationId = this.registration.getRegistrationId();
+		MockHttpServletRequest request = get("/logout/saml2/slo");
+		String logoutRequest = serialize(TestOpenSamlObjects.logoutRequest());
+		String encoded = Saml2Utils.samlEncode(Saml2Utils.samlDeflate(logoutRequest));
+		request.setParameter(Saml2ParameterNames.SAML_REQUEST, encoded);
+		given(this.registrations.findUniqueByAssertingPartyEntityId(TestOpenSamlObjects.ASSERTING_PARTY_ENTITY_ID))
+			.willReturn(this.registration);
+		Saml2LogoutRequestValidatorParameters parameters = this.resolver.resolve(request, null);
+		assertThat(parameters.getAuthentication()).isNull();
+		assertThat(parameters.getRelyingPartyRegistration().getRegistrationId()).isEqualTo(registrationId);
+		assertThat(parameters.getLogoutRequest().getSamlRequest()).isEqualTo(encoded);
+	}
+
+	@Test
+	void saml2LogoutRegistrationIdResolveWhenNoMatchingRegistrationIdThenSaml2Exception() {
+		MockHttpServletRequest request = post("/logout/saml2/slo/id");
+		request.setParameter(Saml2ParameterNames.SAML_REQUEST, "request");
+		assertThatExceptionOfType(Saml2AuthenticationException.class)
+			.isThrownBy(() -> this.resolver.resolve(request, null));
+	}
+
+	private MockHttpServletRequest post(String uri) {
+		MockHttpServletRequest request = new MockHttpServletRequest("POST", uri);
+		request.setServletPath(uri);
+		return request;
+	}
+
+	private MockHttpServletRequest get(String uri) {
+		MockHttpServletRequest request = new MockHttpServletRequest("GET", uri);
+		request.setServletPath(uri);
+		return request;
+	}
+
+	private String serialize(XMLObject object) {
+		return this.saml.serialize(object).serialize();
+	}
+
+}

saml2/saml2-service-provider/src/opensaml5Test/java/org/springframework/security/saml2/provider/service/web/authentication/logout/OpenSaml5LogoutResponseResolverTests.java

@@ -0,0 +1,80 @@
+/*
+ * Copyright 2002-2021 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.saml2.provider.service.web.authentication.logout;
+
+import java.util.function.Consumer;
+
+import org.junit.jupiter.api.Test;
+import org.opensaml.saml.saml2.core.LogoutRequest;
+
+import org.springframework.mock.web.MockHttpServletRequest;
+import org.springframework.security.authentication.TestingAuthenticationToken;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.saml2.core.Saml2ParameterNames;
+import org.springframework.security.saml2.provider.service.authentication.TestOpenSamlObjects;
+import org.springframework.security.saml2.provider.service.authentication.logout.Saml2LogoutResponse;
+import org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistration;
+import org.springframework.security.saml2.provider.service.registration.TestRelyingPartyRegistrations;
+import org.springframework.security.saml2.provider.service.web.RelyingPartyRegistrationResolver;
+import org.springframework.security.saml2.provider.service.web.authentication.logout.OpenSaml5LogoutResponseResolver.LogoutResponseParameters;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+
+/**
+ * Tests for {@link OpenSaml5LogoutResponseResolver}
+ */
+public class OpenSaml5LogoutResponseResolverTests {
+
+	private final OpenSamlOperations saml = new OpenSaml5Template();
+
+	RelyingPartyRegistrationResolver relyingPartyRegistrationResolver = mock(RelyingPartyRegistrationResolver.class);
+
+	@Test
+	public void resolveWhenCustomParametersConsumerThenUses() {
+		OpenSaml5LogoutResponseResolver logoutResponseResolver = new OpenSaml5LogoutResponseResolver(
+				this.relyingPartyRegistrationResolver);
+		Consumer<LogoutResponseParameters> parametersConsumer = mock(Consumer.class);
+		logoutResponseResolver.setParametersConsumer(parametersConsumer);
+		MockHttpServletRequest request = new MockHttpServletRequest();
+		RelyingPartyRegistration registration = TestRelyingPartyRegistrations.relyingPartyRegistration()
+			.assertingPartyDetails(
+					(party) -> party.singleLogoutServiceResponseLocation("https://ap.example.com/logout"))
+			.build();
+		Authentication authentication = new TestingAuthenticationToken("user", "password");
+		LogoutRequest logoutRequest = TestOpenSamlObjects.assertingPartyLogoutRequest(registration);
+		request.setParameter(Saml2ParameterNames.SAML_REQUEST,
+				Saml2Utils.samlEncode(this.saml.serialize(logoutRequest).serialize().getBytes()));
+		given(this.relyingPartyRegistrationResolver.resolve(any(), any())).willReturn(registration);
+		Saml2LogoutResponse logoutResponse = logoutResponseResolver.resolve(request, authentication);
+		assertThat(logoutResponse).isNotNull();
+		verify(parametersConsumer).accept(any());
+	}
+
+	@Test
+	public void setParametersConsumerWhenNullThenIllegalArgument() {
+		OpenSaml5LogoutRequestResolver logoutRequestResolver = new OpenSaml5LogoutRequestResolver(
+				this.relyingPartyRegistrationResolver);
+		assertThatExceptionOfType(IllegalArgumentException.class)
+			.isThrownBy(() -> logoutRequestResolver.setParametersConsumer(null));
+	}
+
+}