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package org.apache.cayenne.crypto.transformer.bytes;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.apache.cayenne.crypto.unit.CryptoUnitUtils;
import org.junit.Before;
import org.junit.Test;
public class CbcDecryptorTest {
private Cipher cipher;
private Key key;
@Before
public void before() throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException {
byte[] keyBytes = CryptoUnitUtils.hexToBytes("a4cb499fa31a6a228e16b7e4741d4fa3");
this.key = new SecretKeySpec(keyBytes, "AES");
this.cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
assertEquals(16, cipher.getBlockSize());
}
@Test
public void testIv() {
CbcDecryptor decryptor = new CbcDecryptor(cipher);
byte[] input = { 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1 };
byte[] ivBytes = { 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1 };
IvParameterSpec iv = decryptor.iv(input, 5);
assertArrayEquals(ivBytes, iv.getIV());
}
@Test
public void testDecrypt() throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException,
InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException {
CbcDecryptor decryptor = new CbcDecryptor(cipher);
byte[] plain = { 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1 };
byte[] ivBytes = CryptoUnitUtils.hexToBytes("0591849d87c93414f4405d32f4d69220");
Cipher encCipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
encCipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(ivBytes));
byte[] encrypted = encCipher.doFinal(plain);
byte[] encryptedWithIv = new byte[encrypted.length + ivBytes.length];
System.arraycopy(ivBytes, 0, encryptedWithIv, 0, ivBytes.length);
System.arraycopy(encrypted, 0, encryptedWithIv, ivBytes.length, encrypted.length);
byte[] decrypted = decryptor.decrypt(encryptedWithIv, 0, key);
assertArrayEquals(plain, decrypted);
}
}