Java BufferedBlockCipher.init方法代碼示例

import org.bouncycastle.crypto.BufferedBlockCipher; //導入方法依賴的package包/類
@Override
    public String decrypt(byte[] encrypted) {
//        Cipher cipher = null;
        String plain;
        try {
//            Security.addProvider(new BouncyCastlePQCProvider());
//            cipher = Cipher.getInstance("AES/CBC/PKCS5Padding", new BouncyCastlePQCProvider());
//            cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(encryptionKey, "AES"), new IvParameterSpec(iv));
//            plain = new String(cipher.doFinal(encrypted), "UTF-8");
            KeyParameter keyParam = new KeyParameter(encryptionKey);
            CipherParameters params = new ParametersWithIV(keyParam, iv);
            BlockCipherPadding padding = new PKCS7Padding();
            BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(
                    new CBCBlockCipher(new AESEngine()), padding);
            cipher.reset();
            cipher.init(false, params);
            byte[] buffer = new byte[cipher.getOutputSize(encrypted.length)];
            int len = cipher.processBytes(encrypted, 0, encrypted.length, buffer, 0);
            len += cipher.doFinal(buffer, len);
            byte[] out = Arrays.copyOfRange(buffer, 0, len);
            plain = new String(out, "UTF-8");
        } catch (Exception e) {
            throw new RuntimeException("decrypt error in SimpleAesManaged", e);
        }
        return plain;
    }
 

import org.bouncycastle.crypto.BufferedBlockCipher; //導入方法依賴的package包/類
private static byte[] EncryptAes256(byte[] data, byte[] encryptionKey)
{
    try {
        KeyParameter keyParam = new KeyParameter(encryptionKey);
        BlockCipherPadding padding = new PKCS7Padding();
        BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(
                new CBCBlockCipher(new AESEngine()), padding);
        cipher.reset();
        cipher.init(true, keyParam);
        byte[] buffer = new byte[cipher.getOutputSize(data.length)];
        int len = cipher.processBytes(data, 0, data.length, buffer, 0);
        len += cipher.doFinal(buffer, len);
        return Arrays.copyOfRange(buffer, 0, len);
    } catch (Exception e) {
        throw new RuntimeException("decrypt error in SimpleAesManaged", e);
    }
}
 

import org.bouncycastle.crypto.BufferedBlockCipher; //導入方法依賴的package包/類
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;
}
 

import org.bouncycastle.crypto.BufferedBlockCipher; //導入方法依賴的package包/類
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;
  }
 

import org.bouncycastle.crypto.BufferedBlockCipher; //導入方法依賴的package包/類
private void basicTrial(BufferedBlockCipher cipher, KeyParameter param)
    throws InvalidCipherTextException
{
    cipher.init(true, param);

    byte[]  out = new byte[input.length];

    int len1 = cipher.processBytes(input, 0, input.length, out, 0);

    cipher.doFinal(out, len1);

    if (!areEqual(out, output))
    {
        fail("failed - " + "expected " + new String(Hex.encode(output)) + " got " + new String(Hex.encode(out)));
    }
}
 

import org.bouncycastle.crypto.BufferedBlockCipher; //導入方法依賴的package包/類
public static byte[] processECB(byte[] key, boolean forEncryption, byte[] input) {

		final BufferedBlockCipher cipher = new BufferedBlockCipher(new TwofishEngine());
		final KeyParameter kp = new KeyParameter(key);
		cipher.init(forEncryption, kp);
		final byte[] out = new byte[input.length];

		final int len1 = cipher.processBytes(input, 0, input.length, out, 0);

		try {
			cipher.doFinal(out, len1);
		} catch (final CryptoException e) {
			throw new RuntimeException(e);
		}
		return out;
	}
 

import org.bouncycastle.crypto.BufferedBlockCipher; //導入方法依賴的package包/類
private static InputStream CreateInputStream(InputStream s, boolean bEncrypt, byte[] pbKey, byte[] pbIV)
		{

			byte[] pbLocalIV = new byte[16];
			System.arraycopy(pbIV, 0, pbLocalIV, 0, 16);

			byte[] pbLocalKey = new byte[32];
			System.arraycopy(pbKey, 0, pbLocalKey, 0, 32);

            try {
//                Cipher r = Cipher.getInstance("AES/CBC/PKCS5Padding");
//                IvParameterSpec ivspec = new IvParameterSpec(pbLocalIV);
//                SecretKeySpec keyspec = new SecretKeySpec(pbLocalKey, "AES");
//                r.init(Cipher.DECRYPT_MODE, keyspec, ivspec);

                BlockCipher aes = AesEngines.createAesEngine();
                KeyParameter key = new KeyParameter(pbLocalKey);
                ParametersWithIV iv = new ParametersWithIV(key, pbLocalIV);
                BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(aes));
                cipher.init(false, iv);

                return new CipherInputStream(s, cipher);
            } catch (Exception e) {
                throw new IllegalStateException(e);
            }
		}
 

import org.bouncycastle.crypto.BufferedBlockCipher; //導入方法依賴的package包/類
private static OutputStream CreateOutputStream(OutputStream s, boolean bEncrypt, byte[] pbKey, byte[] pbIV)
        {

            byte[] pbLocalIV = new byte[16];
            System.arraycopy(pbIV, 0, pbLocalIV, 0, 16);

            byte[] pbLocalKey = new byte[32];
            System.arraycopy(pbKey, 0, pbLocalKey, 0, 32);

            try {
                BlockCipher aes = AesEngines.createAesEngine();
                KeyParameter key = new KeyParameter(pbLocalKey);
                ParametersWithIV iv = new ParametersWithIV(key, pbLocalIV);
                BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(aes));

                cipher.init(true, iv);
//                Cipher r = Cipher.getInstance("AES/CBC/PKCS5Padding");
//                IvParameterSpec ivspec = new IvParameterSpec(pbLocalIV);
//                SecretKeySpec keyspec = new SecretKeySpec(pbLocalKey, "AES");
//                r.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);

                return new CipherOutputStream(s, cipher);
            } catch (Exception e) {
                throw new IllegalStateException(e);
            }
        }
 

import org.bouncycastle.crypto.BufferedBlockCipher; //導入方法依賴的package包/類
/**
 * Returns the decrypted private key
 *
 * @param       keyPhrase       Key phrase used to derive the encryption key
 * @return                      Private key
 * @throws      ECException     Unable to complete a cryptographic function
 */
public BigInteger getPrivKey(String keyPhrase) throws ECException {
    KeyParameter aesKey = deriveKey(keyPhrase, salt);
    //
    // Decrypt the private key using the generated AES key
    //
    BigInteger privKey;
    try {
        ParametersWithIV keyWithIV = new ParametersWithIV(aesKey, iv);
        CBCBlockCipher blockCipher = new CBCBlockCipher(new AESEngine());
        BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(blockCipher);
        cipher.init(false, keyWithIV);
        int bufferLength = cipher.getOutputSize(encKeyBytes.length);
        byte[] outputBytes = new byte[bufferLength];
        int length1 = cipher.processBytes(encKeyBytes, 0, encKeyBytes.length, outputBytes, 0);
        int length2 = cipher.doFinal(outputBytes, length1);
        int actualLength = length1 + length2;
        byte[] privKeyBytes = new byte[actualLength];
        System.arraycopy(outputBytes, 0, privKeyBytes, 0, actualLength);
        privKey = new BigInteger(privKeyBytes);
    } catch (Exception exc) {
        throw new ECException("Unable to decrypt the private key", exc);
    }
    return privKey;
}
 

import org.bouncycastle.crypto.BufferedBlockCipher; //導入方法依賴的package包/類
private byte[] process(byte[] data, boolean encryption) throws DataLengthException {
	BlockCipher cipher = new AESEngine();
	BlockCipherPadding padding = new ZeroBytePadding();
	BufferedBlockCipher bufferedCipher = new PaddedBufferedBlockCipher(cipher, padding);
	bufferedCipher.init(encryption, key);
	byte[] output = new byte[bufferedCipher.getOutputSize(data.length)];
	int bytesProcessed = bufferedCipher.processBytes(data, 0, data.length, output, 0);
	try {
		bufferedCipher.doFinal(output, bytesProcessed);
		return output;
	} catch (IllegalStateException
			| InvalidCipherTextException e) {
		e.printStackTrace();
	}
	return null;
}
 

import org.bouncycastle.crypto.BufferedBlockCipher; //導入方法依賴的package包/類
private static byte[] crypt(final boolean encrypt, final byte[] bytes, final String password, final byte[] salt) throws InvalidCipherTextException {
    final PBEParametersGenerator keyGenerator = new PKCS12ParametersGenerator(new SHA256Digest());
    keyGenerator.init(PKCS12ParametersGenerator.PKCS12PasswordToBytes(password.toCharArray()), salt, 20);
    final CipherParameters keyParams = keyGenerator.generateDerivedParameters(256, 128);

    final BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESEngine()), new PKCS7Padding());
    cipher.init(encrypt, keyParams);

    final byte[] processed = new byte[cipher.getOutputSize(bytes.length)];
    int outputLength = cipher.processBytes(bytes, 0, bytes.length, processed, 0);
    outputLength += cipher.doFinal(processed, outputLength);

    final byte[] results = new byte[outputLength];
    System.arraycopy(processed, 0, results, 0, outputLength);
    return results;
}
 

import org.bouncycastle.crypto.BufferedBlockCipher; //導入方法依賴的package包/類
public boolean checkPassword(String candidate_password, byte[] raw_password) {
	try {
		BlockCipherPadding padding = new PKCS7Padding();
		BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESEngine()), padding);
		cipher.reset();
		cipher.init(false, params);
		
		byte[] buf = new byte[cipher.getOutputSize(raw_password.length)];
		int len = cipher.processBytes(raw_password, 0, raw_password.length, buf, 0);
		len += cipher.doFinal(buf, len);
		
		return BCrypt.checkpw(candidate_password, new String(buf, 0, len));
	} catch (Exception e) {
		Loggers.Auth.error("Can't extract hashed password", e);
	}
	return false;
}
 

import org.bouncycastle.crypto.BufferedBlockCipher; //導入方法依賴的package包/類
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;
  }
 

import org.bouncycastle.crypto.BufferedBlockCipher; //導入方法依賴的package包/類
public static BufferedBlockCipher createSymmetricKeyWrapper(boolean forEncryption, BlockCipher engine, byte[] key, byte[] iv)
{
    BufferedBlockCipher c = new BufferedBlockCipher(new CFBBlockCipher(engine, engine.getBlockSize() * 8));

    c.init(forEncryption, new ParametersWithIV(new KeyParameter(key), iv));

    return c;
}
 

import org.bouncycastle.crypto.BufferedBlockCipher; //導入方法依賴的package包/類
private void testCTS(
    int                 id,
    int                 type,
    BlockCipher         cipher,
    CipherParameters    params,
    byte[]              input,
    byte[]              output)
    throws Exception
{
    byte[]                  out = new byte[input.length];
    BufferedBlockCipher     engine = new NISTCTSBlockCipher(type, cipher);

    engine.init(true, params);

    int len = engine.processBytes(input, 0, input.length, out, 0);

    engine.doFinal(out, len);

    if (!areEqual(output, out))
    {
        fail(id + " failed encryption expected " + new String(Hex.encode(output)) + " got " + new String(Hex.encode(out)));
    }

    engine.init(false, params);

    len = engine.processBytes(output, 0, output.length, out, 0);

    engine.doFinal(out, len);

    if (!areEqual(input, out))
    {
        fail(id + " failed decryption expected " + new String(Hex.encode(input)) + " got " + new String(Hex.encode(out)));
    }
}