Java PaddedBufferedBlockCipher.doFinal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
/**
 * 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
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);
    }
}
 

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);
}
 

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

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, byte[] nonce) {
    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);
        for (int i = 0; i < 32; i++) {
            dhSharedSecret[i] ^= nonce[i];
        }
        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 blockCheck(
    PaddedBufferedBlockCipher   cipher,
    BlockCipherPadding          padding,
    KeyParameter                key,
    byte[]                      data)
{
    byte[]  out = new byte[data.length + 8];
    byte[]  dec = new byte[data.length];
    
    try
    {                
        cipher.init(true, key);
        
        int    len = cipher.processBytes(data, 0, data.length, out, 0);
        
        len += cipher.doFinal(out, len);
        
        cipher.init(false, key);
        
        int    decLen = cipher.processBytes(out, 0, len, dec, 0);
        
        decLen += cipher.doFinal(dec, decLen);
        
        if (!areEqual(data, dec))
        {
            fail("failed to decrypt - i = " + data.length + ", padding = " + padding.getPaddingName());
        }
    }
    catch (Exception e)
    {
        fail("Exception - " + e.toString(), e);
    }
}
 

import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher; //導入方法依賴的package包/類
/**
 * the actual ciphering
 * 
 * @param cipher
 *            the encyption object
 * @param data
 *            the data to encrypt
 * @return the transformed data
 * @throws DataLengthException
 * @throws IllegalStateException
 * @throws InvalidCipherTextException
 */
private byte[] transformData(PaddedBufferedBlockCipher cipher, byte[] data)
		throws DataLengthException, IllegalStateException, InvalidCipherTextException {
	// allocate a buffer that's big enough
	int minSize = cipher.getOutputSize(data.length);
	byte[] outBuf = new byte[minSize];
	// update the cipher
	int length1 = cipher.processBytes(data, 0, data.length, outBuf, 0);
	int length2 = cipher.doFinal(outBuf, length1);
	// copy the actual result into a array of the correct length
	int actualLength = length1 + length2;
	byte[] result = new byte[actualLength];
	System.arraycopy(outBuf, 0, result, 0, result.length);
	return result;
}