Example usage for org.bouncycastle.crypto StreamCipher init

Introduction

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

Prototype

public void init(boolean forEncryption, CipherParameters params) throws IllegalArgumentException;

Source Link

Document

Initialise the cipher.

Usage

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

License:Open Source License

/**
 * /*from  w  w w  . ja  v a 2  s .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 a2 s .  com*/
 * @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 w  w w  . j a va2 s.c  om*/
        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();
    }//ww w  . j  a v a 2  s . 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:com.keepassdroid.crypto.PwStreamCipherFactory.java

License:Open Source License

private static StreamCipher getSalsa20(byte[] key) {
    // Build stream cipher key
    MessageDigest md;//from   w w w.j  a v  a  2s. c o  m
    try {
        md = MessageDigest.getInstance("SHA-256");
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
        throw new RuntimeException("SHA 256 not supported");
    }
    byte[] key32 = md.digest(key);

    KeyParameter keyParam = new KeyParameter(key32);
    ParametersWithIV ivParam = new ParametersWithIV(keyParam, SALSA_IV);

    StreamCipher cipher = new Salsa20Engine();
    cipher.init(true, ivParam);

    return cipher;
}

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

License:Open Source License

StreamCipher getARCFOUR(byte[] key) {
    HashMap attrib = new HashMap();
    //      IRandom keystream = new ARCFour();
    //      attrib.put(ARCFour.ARCFOUR_KEY_MATERIAL, key);
    //      keystream.init(attrib);
    StreamCipher keystream = new RC4Engine();
    CipherParameters params = new KeyParameter(key);
    keystream.init(true, params);
    return keystream;
}

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From source file:shadowsocks.crypto.Chacha20Crypto.java

License:Apache License

@Override
protected StreamCipher createCipher(byte[] iv, boolean encrypt) throws CryptoException {
    StreamCipher c;
    if (mName.equals(CIPHER_CHACHA20_IETF)) {
        c = new ChaCha7539Engine();
    } else {/* w  w  w . j a v  a2 s  .  c om*/
        c = new ChaChaEngine();
    }
    ParametersWithIV parameterIV = new ParametersWithIV(new KeyParameter(mKey), iv, 0, mIVLength);
    c.init(encrypt, parameterIV);
    return c;
}

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