Java PaddedBufferedBlockCipher類代碼示例

import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher; //導入依賴的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.paddings.PaddedBufferedBlockCipher; //導入依賴的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.paddings.PaddedBufferedBlockCipher; //導入依賴的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.paddings.PaddedBufferedBlockCipher; //導入依賴的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.paddings.PaddedBufferedBlockCipher; //導入依賴的package包/類
public static byte[] aesEncrypt(byte[] plaintext, byte[] myPrivateKey, byte[] theirPublicKey, byte[] nonce) {
    try {
        byte[] dhSharedSecret = new byte[32];
        Curve25519.curve(dhSharedSecret, myPrivateKey, theirPublicKey);
        for (int i = 0; i < 32; i++) {
            dhSharedSecret[i] ^= nonce[i];
        }
        byte[] key = sha256().digest(dhSharedSecret);
        byte[] iv = new byte[16];
        secureRandom.get().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);
    }
}
 

import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher; //導入依賴的package包/類
/**
 * 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();
}
 

import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher; //導入依賴的package包/類
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+$", "");
}
 

import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher; //導入依賴的package包/類
public static byte[] aesEncrypt(byte[] plaintext, byte[] myPrivateKey, byte[] theirPublicKey) {
    try {
        byte[] dhSharedSecret = new byte[32];
        Curve25519.curve(dhSharedSecret, myPrivateKey, theirPublicKey);
        byte[] key = sha256().digest(dhSharedSecret);
        byte[] iv = new byte[16];
        secureRandom.get().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);
    }
}
 

import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher; //導入依賴的package包/類
public static byte[] aesDecrypt(byte[] ivCiphertext, byte[] myPrivateKey, byte theirPublicKey[]) {
    try {
        if (ivCiphertext.length < 16 || ivCiphertext.length % 16 != 0) {
            throw new InvalidCipherTextException("invalid ciphertext");
        }
        byte[] iv = Arrays.copyOfRange(ivCiphertext, 0, 16);
        byte[] ciphertext = Arrays.copyOfRange(ivCiphertext, 16, ivCiphertext.length);
        byte[] dhSharedSecret = new byte[32];
        Curve25519.curve(dhSharedSecret, myPrivateKey, theirPublicKey);
        byte[] key = sha256().digest(dhSharedSecret);
        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);
    }
}
 

import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher; //導入依賴的package包/類
private void doCbc(byte[] key, byte[] iv, byte[] pt, byte[] expected)
    throws Exception
{
    PaddedBufferedBlockCipher c = new PaddedBufferedBlockCipher(new CBCBlockCipher(new SerpentEngine()), new PKCS7Padding());

    byte[] ct = new byte[expected.length];

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

    int l = c.processBytes(pt, 0, pt.length, ct, 0);

    c.doFinal(ct, l);

    if (!Arrays.areEqual(expected, ct))
    {
        fail("CBC test failed");
    }
}
 

import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher; //導入依賴的package包/類
public void InitCiphers() {
	// create the ciphers
	// AES block cipher in CBC mode with padding
	encryptCipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(
			new AESEngine()));

	decryptCipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(
			new AESEngine()));

	// create the IV parameter
	ParametersWithIV parameterIV = new ParametersWithIV(new KeyParameter(
			key), IV);

	encryptCipher.init(true, parameterIV);
	decryptCipher.init(false, parameterIV);
}
 

import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher; //導入依賴的package包/類
/**
 * A password-based data decryption using a constant salt value "<b>constantSalt</b>"
 * @param cipher
 * @param password
 * @param salt
 * @param iterationCount
 * @return
 * @throws Exception
 */
public static byte[] decrypt(byte[] cipher, String password) throws Exception
{
    PKCS12ParametersGenerator pGen = new PKCS12ParametersGenerator(new SHA256Digest());
    char[] passwordChars = password.toCharArray();
    final byte[] pkcs12PasswordBytes = PBEParametersGenerator.PKCS12PasswordToBytes(passwordChars);
    pGen.init(pkcs12PasswordBytes, constantSalt.getBytes(), iterations);
    CBCBlockCipher aesCBC = new CBCBlockCipher(new AESEngine());
    ParametersWithIV aesCBCParams = (ParametersWithIV) pGen.generateDerivedParameters(256, 128);
    aesCBC.init(false, aesCBCParams);
    PaddedBufferedBlockCipher aesCipher = new PaddedBufferedBlockCipher(aesCBC, new PKCS7Padding());
    byte[] plainTemp = new byte[aesCipher.getOutputSize(cipher.length)];
    int offset = aesCipher.processBytes(cipher, 0, cipher.length, plainTemp, 0);
    int last = aesCipher.doFinal(plainTemp, offset);
    final byte[] plain = new byte[offset + last];
    System.arraycopy(plainTemp, 0, plain, 0, plain.length);
    return plain;
}
 

import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher; //導入依賴的package包/類
private static byte[] operate(Encryption encryptionAlgorithm, boolean doEncrypt, byte[] subject, byte[] key, byte[] iv) throws CryptoException
{
    // set up padded buffered cipher
    PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(
            CipherBuilder.buildCipher(encryptionAlgorithm, doEncrypt, key, iv), new PKCS7Padding()
    );

    // init with key and if
    cipher.init(doEncrypt, new ParametersWithIV(new KeyParameter(key), iv));

    // construct output buffer
    byte[] output = new byte[cipher.getOutputSize(subject.length)];

    // process all da bytes
    int cursor = cipher.processBytes(subject, 0, subject.length, output, 0);

    // process the last bytes from the buffer
    cipher.doFinal(output, cursor);
    return output;
}
 

import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher; //導入依賴的package包/類
private void initCiphers(byte[] key, byte[] iv) {

		// get the keyBytes
		keyBytes = new byte[key.length];
		System.arraycopy(key, 0, keyBytes, 0, key.length);

		keyP = new KeyParameter(keyBytes);

		// get the IV
		IV = new byte[blockSize];
		System.arraycopy(iv, 0, IV, 0, IV.length);

		// create the ciphers
		// AES block cipher in CBC mode with ISO7816d4 padding
		encryptCipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(
				new AESFastEngine()), new ISO7816d4Padding());

		decryptCipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(
				new AESFastEngine()), new ISO7816d4Padding());

		// create the IV parameter
		ParametersWithIV parameterIV = new ParametersWithIV(keyP, IV);

		encryptCipher.init(true, parameterIV);
		decryptCipher.init(false, parameterIV);
	}
 

import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher; //導入依賴的package包/類
private void initCiphers(byte[] key, byte[] iv) {
	// get the keyBytes
	keyBytes = new byte[key.length];
	System.arraycopy(key, 0, keyBytes, 0, key.length);

	// get the IV
	IV = new byte[blockSize];
	System.arraycopy(iv, 0, IV, 0, iv.length);

	keyP = new KeyParameter(keyBytes);

	encryptCipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(
			new DESedeEngine()), new ISO7816d4Padding());
	decryptCipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(
			new DESedeEngine()), new ISO7816d4Padding());

	// create the IV parameter
	ParametersWithIV parameterIV = new ParametersWithIV(keyP, IV);

	encryptCipher.init(true, parameterIV);
	decryptCipher.init(false, parameterIV);
}