Example usage for org.bouncycastle.crypto StreamCipher processBytes

Introduction

In this page you can find the example usage for org.bouncycastle.crypto StreamCipher processBytes.

Prototype

public int processBytes(byte[] in, int inOff, int len, byte[] out, int outOff) throws DataLengthException;

Source Link

Document

process a block of bytes from in putting the result into out.

Usage

From source file:com.DSC.crypto.Cipher.java

License:Open Source License

/**
 * /*www.  ja  v a 2s.  c om*/
 * @param symmetricKey
 * @param IV
 * @return
 */
public static byte[] encryptMsg(byte[] symmetricKey, byte[] IV, byte[] data) {
    byte[] cipherText = new byte[data.length];

    /* Grain stream cipher */
    StreamCipher grain = new Grain128Engine();

    /* Initialize stream cipher */
    ParametersWithIV param = new ParametersWithIV(new KeyParameter(symmetricKey), IV);
    grain.init(true, param);

    /* Encrypt the message */
    grain.processBytes(data, 0, data.length, cipherText, 0);
    return cipherText;
}

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From source file:com.DSC.crypto.Cipher.java

License:Open Source License

/**
 * //w  w  w .  j  a  v  a  2 s  .  co  m
 * @param symmetricKey
 * @param IV
 * @return
 */
public static byte[] decryptMsg(byte[] symmetricKey, byte[] IV, byte[] data) {
    byte[] cipherText = new byte[data.length];

    /* Grain stream cipher */
    StreamCipher grain = new Grain128Engine();

    /* Initialize stream cipher */
    ParametersWithIV param = new ParametersWithIV(new KeyParameter(symmetricKey), IV);
    grain.init(false, param);

    /* Decrypt the message */
    grain.processBytes(data, 0, data.length, cipherText, 0);
    return cipherText;
}

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From source file:com.github.capone.protocol.crypto.SymmetricKey.java

License:Open Source License

public byte[] encrypt(Nonce nonce, byte[] message) throws EncryptionException {
    try {/*from   ww  w . j  a v  a  2  s  .c  o m*/
        byte[] subkey = new byte[SUBKEYBYTES];
        byte[] encrypted = new byte[message.length + MACBYTES];

        StreamCipher cipher = new XSalsa20Engine();
        cipher.init(true, new ParametersWithIV(key, nonce.nonce));
        cipher.processBytes(subkey, 0, subkey.length, subkey, 0);
        cipher.processBytes(message, 0, message.length, encrypted, MACBYTES);

        Mac auth = new Poly1305();
        auth.init(new KeyParameter(subkey));
        auth.update(encrypted, MACBYTES, message.length);
        auth.doFinal(encrypted, 0);

        return encrypted;
    } catch (Exception e) {
        throw new EncryptionException();
    }
}

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From source file:com.github.capone.protocol.crypto.SymmetricKey.java

License:Open Source License

public byte[] decrypt(Nonce nonce, byte[] encrypted) throws DecryptionException {
    byte[] subkey = new byte[SUBKEYBYTES];
    byte[] mac = new byte[MACBYTES];
    byte[] plain = new byte[encrypted.length - MACBYTES];

    if (encrypted.length < MACBYTES) {
        throw new DecryptionException();
    }//from ww  w .j  a  v  a 2s  . c o m

    StreamCipher cipher = new XSalsa20Engine();
    cipher.init(true, new ParametersWithIV(key, nonce.nonce));
    cipher.processBytes(subkey, 0, subkey.length, subkey, 0);

    Mac auth = new Poly1305();
    auth.init(new KeyParameter(subkey));
    auth.update(encrypted, MACBYTES, encrypted.length - MACBYTES);
    auth.doFinal(mac, 0);

    boolean validMac = true;
    for (int i = 0; i < MACBYTES; i++) {
        validMac &= mac[i] == encrypted[i];
    }
    if (!validMac) {
        throw new DecryptionException();
    }

    cipher.processBytes(encrypted, MACBYTES, encrypted.length - MACBYTES, plain, 0);

    return plain;
}

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From source file:rpc.security.ntlm.NTLMKeyFactory.java

License:Open Source License

byte[] applyARCFOUR(StreamCipher keystream, byte[] data) {
    byte[] retData = new byte[data.length];

    keystream.processBytes(data, 0, data.length, retData, 0);

    //      for (int i = 0; i < data.length; i++) {
    //         retData[i] = (byte) (data[i] ^ keystream.nextByte());
    //      }//  w  ww. jav  a2  s.  co  m

    return retData;
}

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From source file:shadowsocks.crypto.Chacha20Crypto.java

License:Apache License

@Override
protected void process(byte[] in, ByteArrayOutputStream out, boolean encrypt) {
    int size;/*w  ww  .ja va  2 s  .co  m*/
    byte[] buffer = new byte[in.length];
    StreamCipher cipher;
    if (encrypt) {
        cipher = mEncryptCipher;
    } else {
        cipher = mDecryptCipher;
    }
    size = cipher.processBytes(in, 0, in.length, buffer, 0);
    out.write(buffer, 0, size);
}

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