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110 | package com.onegini.example;
import static java.nio.charset.StandardCharsets.UTF_8;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotEquals;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.SecureRandom;
import java.security.Security;
import java.util.Arrays;
import java.util.Base64;
import java.util.Collection;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
@RunWith(Parameterized.class)
public class JceAesGcmEncryptionTest {
/**
* Example results:
*
* Key 128 bit: 64504E14F8C3E18885C67DC57CB4EA4B, initialization vector: TOZvZFEdjaiK3BRYW1+63g==, plaintext: P@ssword1, ciphertext: yiuV8JnT0EERnL0gECFStaO+XZkcTHU2Rw==
* Key 192 bit: 2EAA9BE43F203B52C028A0EE32D8842542C9FF0A3D377FEF, initialization vector: HxSwolleur3ycGzp2Su0qw==, plaintext: P@ssword1P@ssword1P@ssword1P@ssword1, ciphertext: dSYVmPY+xIukujosaTx4HrWCmj8TXhgykKNe2F3bijdBUNhjr26a3S1eXFTsAo/AsU6rcw==
* Key 256 bit: 355D9E1F85FFF43161BDBAFAA7B3994F548767F0C1FB36D5FA36D63C1C3DF413, initialization vector: vuL6aXzYgo4KoiSPg9wFvw==, plaintext: P@ssword1, ciphertext: fwQ9BaJ4gZ49IBbuyzbJDSf4cjngbDKq3g==
*/
private static final String ALGORITHM = "AES";
private static final String CIPHER = "AES/GCM/NoPadding";
private static final String PROVIDER = "BC";
private final SecureRandom secureRandom;
private final String key;
private final String password;
public JceAesGcmEncryptionTest(final String key, final String password) throws NoSuchProviderException, NoSuchAlgorithmException {
this.key = key;
this.password = password;
this.secureRandom = SecureRandom.getInstance("SHA1PRNG", "SUN");
}
@Parameterized.Parameters
public static Collection<Object[]> data() {
return Arrays.asList(new Object[][]{
{ "hex:64504E14F8C3E18885C67DC57CB4EA4B", "P@ssword1"}, // 128 bit hex
{ "Hex:2EAA9BE43F203B52C028A0EE32D8842542C9FF0A3D377FEF", "P@ssword1P@ssword1P@ssword1P@ssword1"}, // 192 bit hex key
{ "HEX:355D9E1F85FFF43161BDBAFAA7B3994F548767F0C1FB36D5FA36D63C1C3DF413", "P@ssword1"}, // 256 bit key hex
});
}
@BeforeClass
public static void setUpClass() {
if (Security.getProvider(BouncyCastleProvider.PROVIDER_NAME) == null) {
Security.addProvider(new BouncyCastleProvider());
}
}
@Test
public void how_to_encrypt_password_with_random_initialization_vector() throws Exception {
final byte[] randomInitializationVector = new byte[16];
secureRandom.nextBytes(randomInitializationVector);
final String randomInitializationVectorBase64 = new String(Base64.getEncoder().encode(randomInitializationVector), UTF_8);
final String passwordEncrypted = encrypt(password, key, randomInitializationVectorBase64);
final String passwordDecrypted = decrypt(passwordEncrypted, key, randomInitializationVectorBase64);
System.out.println(String.format("Key: %s, random initialization vector: %s, password: %s, passwordEncrypted: %s", key, randomInitializationVectorBase64, password, passwordEncrypted));
assertEquals(passwordDecrypted, password);
assertNotEquals(passwordEncrypted, password);
}
public String encrypt(final String plaintext, final String key, final String iv) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, NoSuchProviderException, InvalidAlgorithmParameterException, BadPaddingException, IllegalBlockSizeException {
final byte[] plaintextBytes = plaintext.getBytes();
final Cipher cipher = createCipher(key, iv, Cipher.ENCRYPT_MODE);
final byte[] ciphertextBytes = cipher.doFinal(plaintextBytes);
return new String(Base64.getEncoder().encode(ciphertextBytes), UTF_8);
}
public String decrypt(final String ciphertext, final String key, final String iv) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, NoSuchProviderException, InvalidAlgorithmParameterException, BadPaddingException, IllegalBlockSizeException {
final byte[] ciphertextBytes = Base64.getDecoder().decode(ciphertext);
final Cipher cipher = createCipher(key, iv, Cipher.DECRYPT_MODE);
final byte[] plaintextBytes = cipher.doFinal(ciphertextBytes);
return new String(plaintextBytes, UTF_8);
}
private Cipher createCipher(final String key, final String iv, final int encryptMode) throws NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException {
final SecretKey keySpec = SecretKeySpecFactory.of(key, ALGORITHM);
final IvParameterSpec ivSpec = new IvParameterSpec(Base64.getDecoder().decode(iv));
final Cipher cipher = Cipher.getInstance(CIPHER, PROVIDER);
cipher.init(encryptMode, keySpec, ivSpec, secureRandom);
return cipher;
}
}
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