Adding new module with Secret key to String conversion in Java [BAEL-4489]
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Bhabani Prasad Patel
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## Core Java Security
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This module contains articles about core Java Security
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### Relevant Articles:
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- [Secret Key and String Conversion in Java](https://www.baeldung.com/secret-key-and-string-conversion-in-java/)
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- More articles: [[<-- prev]](/core-java-modules/core-java-security-2)
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>core-java-security-2</artifactId>
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<version>0.1.0-SNAPSHOT</version>
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<name>core-java-security-2</name>
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<packaging>jar</packaging>
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<parent>
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<groupId>com.baeldung.core-java-modules</groupId>
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<artifactId>core-java-modules</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<relativePath>../</relativePath>
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</parent>
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<dependencies>
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<dependency>
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<groupId>commons-codec</groupId>
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<artifactId>commons-codec</artifactId>
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<version>${commons-codec.version}</version>
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</dependency>
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<dependency>
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<groupId>org.bouncycastle</groupId>
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<artifactId>bcprov-jdk15on</artifactId>
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<version>${bouncycastle.version}</version>
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</dependency>
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<!-- test scoped -->
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<dependency>
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<groupId>org.assertj</groupId>
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<artifactId>assertj-core</artifactId>
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<version>${assertj-core.version}</version>
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<scope>test</scope>
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</dependency>
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<!-- https://mvnrepository.com/artifact/javax.xml.bind/jaxb-api -->
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<dependency>
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<groupId>javax.xml.bind</groupId>
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<artifactId>jaxb-api</artifactId>
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<version>${jaxb-api.version}</version>
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</dependency>
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</dependencies>
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<properties>
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<!-- util -->
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<bouncycastle.version>1.60</bouncycastle.version>
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<commons-codec.version>1.11</commons-codec.version>
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<!-- testing -->
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<assertj-core.version>3.18.0</assertj-core.version>
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<jaxb-api.version>2.3.1</jaxb-api.version>
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</properties>
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</project>
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package com.baeldung.secretkeyandstringconversion;
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import java.security.NoSuchAlgorithmException;
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import java.security.spec.InvalidKeySpecException;
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import java.security.spec.KeySpec;
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import java.util.Base64;
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import javax.crypto.KeyGenerator;
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import javax.crypto.SecretKey;
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import javax.crypto.SecretKeyFactory;
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import javax.crypto.spec.PBEKeySpec;
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import javax.crypto.spec.SecretKeySpec;
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public class ConversionClassUtil {
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/* Generating Secret key */
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// Generating Secret Key using KeyGenerator class with 256
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public static SecretKey generateKey(int n) throws NoSuchAlgorithmException {
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KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
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keyGenerator.init(n);
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SecretKey originalKey = keyGenerator.generateKey();
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return originalKey;
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}
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// Generating Secret Key using password and salt
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public static SecretKey getKeyFromPassword(String password, String salt)
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throws NoSuchAlgorithmException, InvalidKeySpecException {
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SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
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KeySpec spec = new PBEKeySpec(password.toCharArray(), salt.getBytes(), 65536, 256);
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SecretKey originalKey = new SecretKeySpec(factory.generateSecret(spec).getEncoded(), "AES");
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return originalKey;
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}
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/* Converting Secret key into String */
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public static String convertSecretKeyToString(SecretKey secretKey) throws NoSuchAlgorithmException {
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// Converting the Secret Key into byte array
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byte[] rawData = secretKey.getEncoded();
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// Getting String - Base64 encoded version of the Secret Key
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String encodedKey = Base64.getEncoder().encodeToString(rawData);
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return encodedKey;
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}
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/* Converting String into Secret key into */
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public static SecretKey convertStringToSecretKeyto(String encodedKey) {
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// Decoding the Base64 encoded string into byte array
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byte[] decodedKey = Base64.getDecoder().decode(encodedKey);
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// Rebuilding the Secret Key using SecretKeySpec Class
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SecretKey originalKey = new SecretKeySpec(decodedKey, 0, decodedKey.length, "AES");
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return originalKey;
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}
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}
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package com.baeldung.secretkeyandstringconversion;
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import java.security.NoSuchAlgorithmException;
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import java.security.spec.InvalidKeySpecException;
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import javax.crypto.SecretKey;
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import org.junit.jupiter.api.Assertions;
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import org.junit.jupiter.api.Test;
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public class ConversionClassUtilUnitTest {
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@Test
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void givenPasswordAndSalt_whenCreateSecreKeyCheckConversion_thenSuccess()
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throws NoSuchAlgorithmException, InvalidKeySpecException {
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// given
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String password = "Baeldung@2021";
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String salt = "@$#baelDunG@#^$*";
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// when
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SecretKey encodedKey = ConversionClassUtil.getKeyFromPassword(password, salt);
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String encodedString = ConversionClassUtil.convertSecretKeyToString(encodedKey);
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SecretKey decodeKey = ConversionClassUtil.convertStringToSecretKeyto(encodedString);
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// then
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Assertions.assertEquals(encodedKey, decodeKey);
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}
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@Test
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void givenSize_whenCreateSecreKeyCheckConversion_thenSuccess()
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throws NoSuchAlgorithmException, InvalidKeySpecException {
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// given
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int size = 256;
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// when
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SecretKey encodedKey = ConversionClassUtil.generateKey(size);
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String encodedString = ConversionClassUtil.convertSecretKeyToString(encodedKey);
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SecretKey decodeKey = ConversionClassUtil.convertStringToSecretKeyto(encodedString);
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// then
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Assertions.assertEquals(encodedKey, decodeKey);
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}
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}
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