Java PaddedBufferedBlockCipher.init方法代碼示例

import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher; //導入方法依賴的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; //導入方法依賴的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; //導入方法依賴的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; //導入方法依賴的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; //導入方法依賴的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; //導入方法依賴的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; //導入方法依賴的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; //導入方法依賴的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; //導入方法依賴的package包/類
/**
 * 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))
    {
        org.apache.commons.io.IOUtils.copy(cis, output);
    }
}
 

import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher; //導入方法依賴的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; //導入方法依賴的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);
}
 

import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher; //導入方法依賴的package包/類
@Override
public OutputStream encryptedOutputStream(final Path path, final String password) throws IOException,
        EncryptionFailedException {
    try {
        final byte[] salt = generateSalt();
        final byte[] key = generateKey(password, salt);
        final byte[] iv = generateIV();
        final byte[] fileInitBlock = generateOutputInitBlock(salt, iv);

        final PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(
                new CBCBlockCipher(new AESEngine()), new PKCS7Padding());

        final KeyParameter keyParam = new KeyParameter(key);
        final CipherParameters params = new ParametersWithIV(keyParam, iv);
        cipher.init(true, params);

        final BufferedOutputStream out = new BufferedOutputStream(Files.newOutputStream(path));
        out.write(fileInitBlock);

        return new CipherOutputStream(out, cipher);
    } catch (InvalidKeySpecException | NoSuchAlgorithmException e) {
        throw new EncryptionFailedException(e);
    }
}
 

import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher; //導入方法依賴的package包/類
@Override
public InputStream decryptedInputStream(final Path path, final String password) throws IOException,
        DecryptionFailedException {
    try {
        InputStream in = new BufferedInputStream(Files.newInputStream(path));
        byte[] initBlock = readInitBlock(in);
        byte[] salt = extractSalt(initBlock);
        byte[] iv = extractIV(initBlock);
        byte[] key = generateKey(password, salt);

        PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESEngine()),
                new PKCS7Padding());
        KeyParameter keyParam = new KeyParameter(key);
        CipherParameters params = new ParametersWithIV(keyParam, iv);
        cipher.init(false, params);

        return new CipherInputStream(in, cipher);
    } catch (InvalidKeySpecException | NoSuchAlgorithmException e) {
        throw new DecryptionFailedException(e);
    }
}
 

import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher; //導入方法依賴的package包/類
@Test
public void test() throws DataLengthException, IllegalStateException, InvalidCipherTextException {
    PaddedBufferedBlockCipher encryptCipher = new PaddedBufferedBlockCipher(new DESedeEngine());
    PaddedBufferedBlockCipher decryptCipher = new PaddedBufferedBlockCipher(new DESedeEngine());
    
    byte inBuff[] = "Hello Wd".getBytes();
    byte[] outBuff = new byte[512];
    byte[] keyBytes = "TestTestTestTest".getBytes();
    byte[] uncipherData = new byte[8];
    
    encryptCipher.init(true, new KeyParameter(keyBytes));
    decryptCipher.init(false, new KeyParameter(keyBytes));
    
    encryptCipher.processBytes(inBuff, 0, inBuff.length, outBuff, 0);
    encryptCipher.doFinal(outBuff, 0);
    
    decryptCipher.processBytes(outBuff, 0, 2*inBuff.length, uncipherData, 0);
    decryptCipher.doFinal(uncipherData, 0);
    
    log.debug("Uncipher Data: {}", uncipherData);
    
    assertTrue("Hello Wd".equals(new String(uncipherData)));
}
 

import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher; //導入方法依賴的package包/類
public String decipher(byte[] key, String cipherText) throws InvalidCipherTextException {
    PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new DESEngine()));
    cipher.init(false, new KeyParameter(Hex.decode(key)));
    byte[] cipherTextBytes = java.util.Base64.getDecoder().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);
}