org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher Java Examples

/**
 * Encrypt or decrypt data with AES256.
 *
 * @param data The data to encrypt.
 * @param output The output to write the encrypted data to.
 *
 * @throws IOException If there is an error reading the data.
 */
private void decryptDataAES256(InputStream data, OutputStream output) throws IOException
{
    byte[] iv = new byte[16];

    // read IV from stream
    int ivSize = data.read(iv);
    if (ivSize == -1)
    {
        return;
    }

    if (ivSize != iv.length)
    {
        throw new IOException("AES initialization vector not fully read: only " + ivSize
                + " bytes read instead of " + iv.length);
    }
    PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(
            new CBCBlockCipher(new AESFastEngine()));
    cipher.init(false, new ParametersWithIV(new KeyParameter(encryptionKey), iv));
    try (CipherInputStream cis = new CipherInputStream(data, cipher))
    {
        IOUtils.copy(cis, output);
    }
}
 

@Override
public byte[] aesDecrypt(byte[] encrypted, byte[] signingKey, byte[] nonce) {
    if (signingKey.length != 32) {
        throw new IllegalArgumentException("Key length must be 32 bytes");
    }
    try {
        if (encrypted.length < 16 || encrypted.length % 16 != 0) {
            throw new InvalidCipherTextException("invalid ciphertext");
        }
        byte[] iv = Arrays.copyOfRange(encrypted, 0, 16);
        byte[] ciphertext = Arrays.copyOfRange(encrypted, 16, encrypted.length);
        for (int i = 0; i < 32; i++) {
            signingKey[i] ^= nonce[i];
        }
        byte[] key = getSha256().digest(signingKey);
        PaddedBufferedBlockCipher aes = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESEngine()));
        CipherParameters ivAndKey = new ParametersWithIV(new KeyParameter(key), iv);
        aes.init(false, ivAndKey);
        byte[] output = new byte[aes.getOutputSize(ciphertext.length)];
        int plaintextLength = aes.processBytes(ciphertext, 0, ciphertext.length, output, 0);
        plaintextLength += aes.doFinal(output, plaintextLength);
        byte[] result = new byte[plaintextLength];
        System.arraycopy(output, 0, result, 0, result.length);
        return result;
    } catch (InvalidCipherTextException e) {
        throw new RuntimeException(e.getMessage(), e);
    }
}
 

private static String decrypt(byte[] key, String cipherText) throws CryptoException {
    try {
        PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new DESEngine()));
        cipher.init(false, new KeyParameter(key));
        byte[] cipherTextBytes = DECODER.decode(cipherText);

        byte[] plainTextBytes = new byte[cipher.getOutputSize(cipherTextBytes.length)];
        int outputLength = cipher.processBytes(cipherTextBytes, 0, cipherTextBytes.length, plainTextBytes, 0);
        cipher.doFinal(plainTextBytes, outputLength);
        int paddingStarts = plainTextBytes.length - 1;
        for (; paddingStarts >= 0; paddingStarts--) {
            if (plainTextBytes[paddingStarts] != 0) {
                break;
            }
        }
        return new String(plainTextBytes, 0, paddingStarts + 1);
    } catch (Exception e) {
        throw new CryptoException(e);
    }
}
 

public static byte[] decryptAESCBC(byte[] key, byte[] iv, byte[] data) {
    // AES CBC PKCS7 decrypt
    try {
        CipherParameters cipherParameters = new ParametersWithIV(new KeyParameter(key), iv);
        PaddedBufferedBlockCipher cipher
                = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESFastEngine()), new PKCS7Padding());
        cipher.init(false, cipherParameters);

        byte[] buffer = new byte[cipher.getOutputSize(data.length)];

        int pos = cipher.processBytes(data, 0, data.length, buffer, 0);
        pos += cipher.doFinal(buffer, pos);

        return Arrays.copyOf(buffer, pos);

    } catch (DataLengthException | IllegalStateException | InvalidCipherTextException ex) {
        throw new IllegalArgumentException("decrypt failed", ex);
    }
}
 

private static byte[] processAESCipher(boolean encrypt, byte[] data, SecretKey key, byte[] initVector)
		throws DataLengthException, IllegalStateException, InvalidCipherTextException {
	// seat up engine, block cipher mode and padding
	AESEngine aesEngine = new AESEngine();
	CBCBlockCipher cbc = new CBCBlockCipher(aesEngine);
	PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(cbc);

	// apply parameters
	CipherParameters parameters = new ParametersWithIV(new KeyParameter(key.getEncoded()), initVector);
	cipher.init(encrypt, parameters);

	// process ciphering
	byte[] output = new byte[cipher.getOutputSize(data.length)];

	int bytesProcessed1 = cipher.processBytes(data, 0, data.length, output, 0);
	int bytesProcessed2 = cipher.doFinal(output, bytesProcessed1);
	byte[] result = new byte[bytesProcessed1 + bytesProcessed2];
	System.arraycopy(output, 0, result, 0, result.length);
	return result;
}
 

public String testEncryptRijndael(String value,String key) throws DataLengthException, IllegalStateException, InvalidCipherTextException {
    BlockCipher engine = new RijndaelEngine(256);
    BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(engine), new ZeroBytePadding());

    byte[] keyBytes = key.getBytes();
    cipher.init(true, new KeyParameter(keyBytes));

    byte[] input = value.getBytes();
    byte[] cipherText = new byte[cipher.getOutputSize(input.length)];

    int cipherLength = cipher.processBytes(input, 0, input.length, cipherText, 0);
    cipher.doFinal(cipherText, cipherLength);

    String result = new String(Base64.encode(cipherText));
    //Log.e("testEncryptRijndael : " , result);
    return  result;
}
 

private byte[] encryptDESFile(String keys, byte[] plainText) {
BlockCipher engine = new DESEngine();

      byte[] key = keys.getBytes();
      byte[] ptBytes = plainText;
      BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(engine));
      cipher.init(true, new KeyParameter(key));
      byte[] rv = new byte[cipher.getOutputSize(ptBytes.length)];
      int tam = cipher.processBytes(ptBytes, 0, ptBytes.length, rv, 0);
      try {
          cipher.doFinal(rv, tam);
      } catch (Exception ce) {
          ce.printStackTrace();
      }
      return rv;
  }
 

private String decryptStr(String instr) throws GeneralSecurityException {
    if(StringUtils.isEmpty(instr)){
        return instr;
    }
    long t1 = System.currentTimeMillis();
    PaddedBufferedBlockCipher decryptor = new PaddedBufferedBlockCipher(
            new CBCBlockCipher(new DESedeEngine()));
    decryptor.init(false, keyParameter);
    byte[] in = null;
    byte[] cipherText = null;

    try {
    	in = Hex.decode(instr);
    	cipherText = new byte[decryptor.getOutputSize(in.length)];

     int outputLen = decryptor.processBytes(in, 0, in.length, cipherText, 0);
        decryptor.doFinal(cipherText, outputLen);
    } catch (Exception e) {
        throw new GeneralSecurityException(e);
    }
    long t2 = System.currentTimeMillis();
    logger.debug("Time taken to decrypt(millis) : " + (t2 - t1));
    return (new String(cipherText)).replaceAll("\\u0000+$", "");
}
 

/**
 * Encrypt.
 *
 * @param instr the instr
 * @return the string
 * @throws java.security.GeneralSecurityException the general security exception
 */
@Override
public String encrypt(String instr) throws GeneralSecurityException {
    long t1 = System.currentTimeMillis();
    byte[] in = instr.getBytes();
    PaddedBufferedBlockCipher encryptor = new PaddedBufferedBlockCipher(
            new CBCBlockCipher(new DESedeEngine()));
    encryptor.init(true, keyParameter);
    byte[] cipherText = new byte[encryptor.getOutputSize(in.length)];
    int outputLen = encryptor.processBytes(in, 0, in.length, cipherText, 0);
    ByteArrayOutputStream os = new ByteArrayOutputStream();
    try {
        encryptor.doFinal(cipherText, outputLen);
        Hex.encode(cipherText, os);
    } catch (Exception e) {
        e.printStackTrace();
        throw new GeneralSecurityException(e);
    }
    long t2 = System.currentTimeMillis();
    logger.debug("Time taken to encrypt(millis) :" + (t2 - t1));
    return ENC_PREFIX + os.toString();
}
 

@Override
public byte[] aesEncrypt(byte[] plaintext, byte[] signingKey, byte[] nonce) {
    if (signingKey.length != 32) {
        throw new IllegalArgumentException("Key length must be 32 bytes");
    }
    try {
        for (int i = 0; i < 32; i++) {
            signingKey[i] ^= nonce[i];
        }
        byte[] key = getSha256().digest(signingKey);
        byte[] iv = new byte[16];
        secureRandom.nextBytes(iv);
        PaddedBufferedBlockCipher aes = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESEngine()));
        CipherParameters ivAndKey = new ParametersWithIV(new KeyParameter(key), iv);
        aes.init(true, ivAndKey);
        byte[] output = new byte[aes.getOutputSize(plaintext.length)];
        int ciphertextLength = aes.processBytes(plaintext, 0, plaintext.length, output, 0);
        ciphertextLength += aes.doFinal(output, ciphertextLength);
        byte[] result = new byte[iv.length + ciphertextLength];
        System.arraycopy(iv, 0, result, 0, iv.length);
        System.arraycopy(output, 0, result, iv.length, ciphertextLength);
        return result;
    } catch (InvalidCipherTextException e) {
        throw new RuntimeException(e.getMessage(), e);
    }
}
 

/**
 * 数据通过KeyParameter解密
 *
 * @param dataToDecrypt 需要解密的数据
 * @param aesKey        秘钥
 * @return 解密后的数据
 */
public static byte[] decrypt(EncryptedData dataToDecrypt, KeyParameter aesKey) throws CryptoException {
    HexUtil.checkNotNull(dataToDecrypt);
    HexUtil.checkNotNull(aesKey);

    try {
        ParametersWithIV keyWithIv = new ParametersWithIV(new KeyParameter(aesKey.getKey()), dataToDecrypt.getInitialisationVector());

        // Decrypt the validator.
        BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESFastEngine()));
        cipher.init(false, keyWithIv);

        byte[] cipherBytes = dataToDecrypt.getEncryptedBytes();
        byte[] decryptedBytes = new byte[cipher.getOutputSize(cipherBytes.length)];
        final int length1 = cipher.processBytes(cipherBytes, 0, cipherBytes.length, decryptedBytes, 0);
        final int length2 = cipher.doFinal(decryptedBytes, length1);

        return Arrays.copyOf(decryptedBytes, length1 + length2);
    } catch (Exception e) {
        throw new CryptoException();
    }
}
 

/**
 * 数据通过KeyParameter和初始化向量加密
 *
 * @param plainBytes 需要加密的数据
 * @param iv         初始化向量
 * @param aesKey     秘钥
 * @return 加密后的数据
 */
public static EncryptedData encrypt(byte[] plainBytes, byte[] iv, KeyParameter aesKey) throws RuntimeException {
    HexUtil.checkNotNull(plainBytes);
    HexUtil.checkNotNull(aesKey);
    try {
        if (iv == null) {
            iv = EncryptedData.DEFAULT_IV;
            //SECURE_RANDOM.nextBytes(iv);
        }
        ParametersWithIV keyWithIv = new ParametersWithIV(aesKey, iv);
        // Encrypt using AES.
        BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESFastEngine()));
        cipher.init(true, keyWithIv);
        byte[] encryptedBytes = new byte[cipher.getOutputSize(plainBytes.length)];
        final int length1 = cipher.processBytes(plainBytes, 0, plainBytes.length, encryptedBytes, 0);
        final int length2 = cipher.doFinal(encryptedBytes, length1);

        return new EncryptedData(iv, Arrays.copyOf(encryptedBytes, length1 + length2));
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}
 

private static byte[] cipherData(PaddedBufferedBlockCipher cipher, byte[] data)
        throws IllegalStateException, InvalidCipherTextException {
    int minSize = cipher.getOutputSize(data.length);
    byte[] outBuf = new byte[minSize];
    int length1 = cipher.processBytes(data, 0, data.length, outBuf, 0);
    int length2 = cipher.doFinal(outBuf, length1);
    int actualLength = length1 + length2;
    if (actualLength == minSize) {
        return outBuf;
    } else {
        return Arrays.copyOf(outBuf, actualLength);
    }
}
 

@Override
public byte[] encrypt(byte[] data, byte[] randomKeyBytes) throws IOException, InvalidKeyException,
        InvalidAlgorithmParameterException, InvalidCipherTextException {

    PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESFastEngine()));
    cipher.init(true, new ParametersWithIV(new KeyParameter(randomKeyBytes), randomIvBytes));
    return cipherData(cipher, data);
}
 

private static String encrypt(byte[] key, String plainText) throws CryptoException {
    try {
        PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new DESEngine()));
        KeyParameter keyParameter = new KeyParameter(key);
        cipher.init(true, keyParameter);
        byte[] plainTextBytes = plainText.getBytes();
        byte[] cipherTextBytes = new byte[cipher.getOutputSize(plainTextBytes.length)];
        int outputLength = cipher.processBytes(plainTextBytes, 0, plainTextBytes.length, cipherTextBytes, 0);
        cipher.doFinal(cipherTextBytes, outputLength);
        return ENCODER.encodeToString(cipherTextBytes).trim();
    } catch (Exception e) {
        throw new CryptoException(e);
    }
}
 

@Override
public byte[] decrypt(byte[] data, byte[] randomKeyBytes)
        throws InvalidKeyException, InvalidAlgorithmParameterException, IOException, IllegalStateException, InvalidCipherTextException {

    PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESFastEngine()));
    cipher.init(false, new ParametersWithIV(new KeyParameter(randomKeyBytes), randomIvBytes));
    return cipherData(cipher, data);
}
 

private PaddedBufferedBlockCipher getCipher(final boolean encrypt) {
  final PaddedBufferedBlockCipher cipher =
      new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESEngine()), new PKCS7Padding());
  final CipherParameters ivAndKey =
      new ParametersWithIV(new KeyParameter(getKey().getEncoded()), salt);
  cipher.init(encrypt, ivAndKey);
  return cipher;
}
 

public Encryptor(String encryptKey) {
  encryptCipher = new PaddedBufferedBlockCipher(new AESEngine(), new ZeroBytePadding());
  encryptCipher.init(true, new KeyParameter(encryptKey.getBytes()));

  decryptCipher = new PaddedBufferedBlockCipher(new AESEngine(), new ZeroBytePadding());
  decryptCipher.init(false, new KeyParameter(encryptKey.getBytes()));
}
 

public String testDecryptRijndael(String value,String key) throws DataLengthException, IllegalStateException, InvalidCipherTextException {
        BlockCipher engine = new RijndaelEngine(256);
        BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(engine), new ZeroBytePadding());

        byte[] keyBytes = key.getBytes();
        cipher.init(false, new KeyParameter(keyBytes));

        byte[] output = Base64.decode(value.getBytes());
        byte[] cipherText = new byte[cipher.getOutputSize(output.length)];

        int cipherLength = cipher.processBytes(output, 0, output.length, cipherText, 0);
        int outputLength = cipher.doFinal(cipherText, cipherLength);
        outputLength += cipherLength;

        byte[] resultBytes = cipherText;
        if (outputLength != output.length) {
            resultBytes = new byte[outputLength];
            System.arraycopy(
                    cipherText, 0,
                    resultBytes, 0,
                    outputLength
            );
        }

        String result = new String(resultBytes);
return  result;
    }
 

public byte[] decryptDESFile(String key, byte[] cipherText) {
BlockCipher engine = new DESEngine();
      byte[] bytes = key.getBytes();
      BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(engine));
      cipher.init(false, new KeyParameter(bytes));
      byte[] rv = new byte[cipher.getOutputSize(cipherText.length)];
      int tam = cipher.processBytes(cipherText, 0, cipherText.length, rv, 0);
      try {
          cipher.doFinal(rv, tam);
      } catch (Exception ce) {
          ce.printStackTrace();
      }
      return rv;
  }
 

/** Creates a new instance of AESCipher */
public AESCipher(boolean forEncryption, byte[] key, byte[] iv) {
    BlockCipher aes = new AESFastEngine();
    BlockCipher cbc = new CBCBlockCipher(aes);
    bp = new PaddedBufferedBlockCipher(cbc);
    KeyParameter kp = new KeyParameter(key);
    ParametersWithIV piv = new ParametersWithIV(kp, iv);
    bp.init(forEncryption, piv);
}
 

public static BufferedBlockCipher setupBlockCipher(
    final byte[] sharedKey, final byte[] ivData, final boolean forEncryption) {
    // Setup cipher parameters with key and IV.
    final KeyParameter keyParam = new KeyParameter(sharedKey);
    final CipherParameters params = new ParametersWithIV(keyParam, ivData);

    // Setup AES cipher in CBC mode with PKCS7 padding.
    final BlockCipherPadding padding = new PKCS7Padding();
    final BufferedBlockCipher cipher =
        new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESEngine()), padding);
    cipher.reset();
    cipher.init(forEncryption, params);
    return cipher;
}
 

/**
 * Encrypt the key with the following output.
 * <pre>
 * ECIES-Ciphertext-Value ::= SEQUENCE {
 *     ephemeralPublicKey ECPoint,
 *     symmetricCiphertext OCTET STRING,
 *     macTag OCTET STRING
 * }
 *
 * ECPoint ::= OCTET STRING
 * </pre>
 */
@Override
public byte[] generateWrappedKey(byte[] keyToWrap) throws OperatorException {
  try {
    BlockCipher cbcCipher = new CBCBlockCipher(new AESEngine());
    IESCipher cipher = new IESCipher(
        new IESEngine(new ECDHBasicAgreement(),
            new KDF2BytesGenerator(new SHA1Digest()),
            new HMac(new SHA1Digest()),
            new PaddedBufferedBlockCipher(cbcCipher)), 16);

    // According to the §3.8 in SEC 1, Version 2.0:
    // "Furthermore here the 16 octet or 128 bit IV for AES in CBC mode should always take
    //  the value 0000000000000000_{16}"
    byte[] iv = new byte[16];
    IESParameterSpec spec = new IESParameterSpec(null, null, aesKeySize, aesKeySize, iv);
    cipher.engineInit(Cipher.ENCRYPT_MODE, publicKey, spec, new SecureRandom());
    byte[] bcResult = cipher.engineDoFinal(keyToWrap, 0, keyToWrap.length);
    // convert the result to ASN.1 format
    ASN1Encodable[] array = new ASN1Encodable[3];
    // ephemeralPublicKey ECPoint
    byte[] ephemeralPublicKey = new byte[ephemeralPublicKeyLen];

    System.arraycopy(bcResult, 0, ephemeralPublicKey, 0, ephemeralPublicKeyLen);
    array[0] = new DEROctetString(ephemeralPublicKey);

    // symmetricCiphertext OCTET STRING
    int symmetricCiphertextLen = bcResult.length - ephemeralPublicKeyLen - macLen;
    byte[] symmetricCiphertext = new byte[symmetricCiphertextLen];
    System.arraycopy(bcResult, ephemeralPublicKeyLen,
        symmetricCiphertext, 0, symmetricCiphertextLen);
    array[1] = new DEROctetString(symmetricCiphertext);

    // macTag OCTET STRING
    byte[] macTag = new byte[macLen];
    System.arraycopy(bcResult, ephemeralPublicKeyLen + symmetricCiphertextLen,
        macTag, 0, macLen);
    array[2] = new DEROctetString(macTag);
    return new DERSequence(array).getEncoded();
  } catch (Exception ex) {
    throw new OperatorException("error while generateWrappedKey", ex);
  }
}
 

ConcatenatingAESEngine()
{
    super(new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESFastEngine())));
    random = new SecureRandom();
}