Remove PasswordEncoderUtils from core

Issue: gh-4674

core/src/main/java/org/springframework/security/authentication/encoding/PasswordEncoderUtils.java

@@ -1,58 +0,0 @@
-/*
- * Copyright 2002-2016 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
- *
- *      http://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.authentication.encoding;
-
-import org.springframework.security.crypto.codec.Utf8;
-
-/**
- * Utility for constant time comparison to prevent against timing attacks.
- *
- * @author Rob Winch
- */
-class PasswordEncoderUtils {
-
-	/**
-	 * Constant time comparison to prevent against timing attacks.
-	 * @param expected
-	 * @param actual
-	 * @return
-	 */
-	static boolean equals(String expected, String actual) {
-		byte[] expectedBytes = bytesUtf8(expected);
-		byte[] actualBytes = bytesUtf8(actual);
-		int expectedLength = expectedBytes == null ? -1 : expectedBytes.length;
-		int actualLength = actualBytes == null ? -1 : actualBytes.length;
-
-		int result = expectedLength == actualLength ? 0 : 1;
-		for (int i = 0; i < actualLength; i++) {
-			byte expectedByte = expectedLength <= 0 ? 0 : expectedBytes[i % expectedLength];
-			byte actualByte = actualBytes[i % actualLength];
-			result |= expectedByte ^ actualByte;
-		}
-		return result == 0;
-	}
-
-	private static byte[] bytesUtf8(String s) {
-		if (s == null) {
-			return null;
-		}
-
-		return Utf8.encode(s); // need to check if Utf8.encode() runs in constant time (probably not). This may leak length of string.
-	}
-
-	private PasswordEncoderUtils() {
-	}
-}

core/src/test/java/org/springframework/security/authentication/encoding/PasswordEncoderUtilsTests.java

@@ -1,70 +0,0 @@
-/*
- * Copyright 2002-2016 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
- *
- *      http://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.authentication.encoding;
-
-import static org.assertj.core.api.Assertions.*;
-
-import org.junit.Test;
-
-/**
- * @author Rob Winch
- */
-public class PasswordEncoderUtilsTests {
-
-	@Test
-	public void equalsWhenDifferentLengthThenFalse() {
-		assertThat(PasswordEncoderUtils.equals("abc", "a")).isFalse();
-		assertThat(PasswordEncoderUtils.equals("a", "abc")).isFalse();
-	}
-
-	@Test
-	public void equalsWhenNullAndNotEmtpyThenFalse() {
-		assertThat(PasswordEncoderUtils.equals(null, "a")).isFalse();
-		assertThat(PasswordEncoderUtils.equals("a", null)).isFalse();
-	}
-
-	@Test
-	public void equalsWhenNullAndNullThenTrue() {
-		assertThat(PasswordEncoderUtils.equals(null, null)).isTrue();
-	}
-
-	@Test
-	public void equalsWhenNullAndEmptyThenFalse() {
-		assertThat(PasswordEncoderUtils.equals(null, "")).isFalse();
-		assertThat(PasswordEncoderUtils.equals("", null)).isFalse();
-	}
-
-	@Test
-	public void equalsWhenNotEmptyAndEmptyThenFalse() {
-		assertThat(PasswordEncoderUtils.equals("abc", "")).isFalse();
-		assertThat(PasswordEncoderUtils.equals("", "abc")).isFalse();
-	}
-
-	@Test
-	public void equalsWhenEmtpyAndEmptyThenTrue() {
-		assertThat(PasswordEncoderUtils.equals("", "")).isTrue();
-	}
-
-	@Test
-	public void equalsWhenDifferentCaseThenFalse() {
-		assertThat(PasswordEncoderUtils.equals("aBc", "abc")).isFalse();
-	}
-
-	@Test
-	public void equalsWhenSameThenTrue() {
-		assertThat(PasswordEncoderUtils.equals("abcdef", "abcdef")).isTrue();
-	}
-}