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Adding new module with Secret key to String conversion in Java [BAEL-4489]

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This commit is contained in:
Bhabani Prasad Patel 2021-05-27 10:55:46 +05:30
parent a40d2ff3b3
commit 061023b683
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core-java-modules/core-java-security-3/README.md Normal file
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## Core Java Security
This module contains articles about core Java Security
### Relevant Articles:
- [Secret Key and String Conversion in Java](https://www.baeldung.com/secret-key-and-string-conversion-in-java/)
- More articles: [[<-- prev]](/core-java-modules/core-java-security-2)

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core-java-modules/core-java-security-3/pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-security-2</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>core-java-security-2</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>${commons-codec.version}</version>
</dependency>
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-jdk15on</artifactId>
<version>${bouncycastle.version}</version>
</dependency>
<!-- test scoped -->
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj-core.version}</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/javax.xml.bind/jaxb-api -->
<dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>${jaxb-api.version}</version>
</dependency>
</dependencies>
<properties>
<!-- util -->
<bouncycastle.version>1.60</bouncycastle.version>
<commons-codec.version>1.11</commons-codec.version>
<!-- testing -->
<assertj-core.version>3.18.0</assertj-core.version>
<jaxb-api.version>2.3.1</jaxb-api.version>
</properties>
</project>

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core-java-modules/core-java-security-3/src/main/java/com/baeldung/secretkeyandstringconversion/ConversionClassUtil.java Normal file
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package com.baeldung.secretkeyandstringconversion;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import java.util.Base64;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
public class ConversionClassUtil {
/* Generating Secret key */
// Generating Secret Key using KeyGenerator class with 256
public static SecretKey generateKey(int n) throws NoSuchAlgorithmException {
KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
keyGenerator.init(n);
SecretKey originalKey = keyGenerator.generateKey();
return originalKey;
}
// Generating Secret Key using password and salt
public static SecretKey getKeyFromPassword(String password, String salt)
throws NoSuchAlgorithmException, InvalidKeySpecException {
SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
KeySpec spec = new PBEKeySpec(password.toCharArray(), salt.getBytes(), 65536, 256);
SecretKey originalKey = new SecretKeySpec(factory.generateSecret(spec).getEncoded(), "AES");
return originalKey;
}
/* Converting Secret key into String */
public static String convertSecretKeyToString(SecretKey secretKey) throws NoSuchAlgorithmException {
// Converting the Secret Key into byte array
byte[] rawData = secretKey.getEncoded();
// Getting String - Base64 encoded version of the Secret Key
String encodedKey = Base64.getEncoder().encodeToString(rawData);
return encodedKey;
}
/* Converting String into Secret key into */
public static SecretKey convertStringToSecretKeyto(String encodedKey) {
// Decoding the Base64 encoded string into byte array
byte[] decodedKey = Base64.getDecoder().decode(encodedKey);
// Rebuilding the Secret Key using SecretKeySpec Class
SecretKey originalKey = new SecretKeySpec(decodedKey, 0, decodedKey.length, "AES");
return originalKey;
}
}

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core-java-modules/core-java-security-3/src/test/java/com/baeldung/secretkeyandstringconversion/ConversionClassUtilUnitTest.java Normal file
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package com.baeldung.secretkeyandstringconversion;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import javax.crypto.SecretKey;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
public class ConversionClassUtilUnitTest {
@Test
void givenPasswordAndSalt_whenCreateSecreKeyCheckConversion_thenSuccess()
throws NoSuchAlgorithmException, InvalidKeySpecException {
// given
String password = "Baeldung@2021";
String salt = "@$#baelDunG@#^$*";
// when
SecretKey encodedKey = ConversionClassUtil.getKeyFromPassword(password, salt);
String encodedString = ConversionClassUtil.convertSecretKeyToString(encodedKey);
SecretKey decodeKey = ConversionClassUtil.convertStringToSecretKeyto(encodedString);
// then
Assertions.assertEquals(encodedKey, decodeKey);
}
@Test
void givenSize_whenCreateSecreKeyCheckConversion_thenSuccess()
throws NoSuchAlgorithmException, InvalidKeySpecException {
// given
int size = 256;
// when
SecretKey encodedKey = ConversionClassUtil.generateKey(size);
String encodedString = ConversionClassUtil.convertSecretKeyToString(encodedKey);
SecretKey decodeKey = ConversionClassUtil.convertStringToSecretKeyto(encodedString);
// then
Assertions.assertEquals(encodedKey, decodeKey);
}
}