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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);
      }
  }
  