Examples with IESParameters org.gudy.bouncycastle.crypto.params.IESParameters used on opensource projects

Example 1 with IESParameters

use of org.gudy.bouncycastle.crypto.params.IESParameters in project BiglyBT by BiglySoftware.

the class JCEIESCipher method engineInit.

public void engineInit(int opmode, Key key, AlgorithmParameterSpec params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException {
    if (!(key instanceof IESKey)) {
        throw new InvalidKeyException("must be passed IE key");
    }
    if (params == null && (opmode == Cipher.ENCRYPT_MODE || opmode == Cipher.WRAP_MODE)) {
        // 
        // if nothing is specified we set up for a 128 bit mac, with
        // 128 bit derivation vectors.
        // 
        byte[] d = new byte[16];
        byte[] e = new byte[16];
        if (random == null) {
            random = new SecureRandom();
        }
        random.nextBytes(d);
        random.nextBytes(e);
        params = new IESParameterSpec(d, e, 128);
    } else if (!(params instanceof IESParameterSpec)) {
        throw new InvalidAlgorithmParameterException("must be passed IES parameters");
    }
    IESKey ieKey = (IESKey) key;
    CipherParameters pubKey;
    CipherParameters privKey;
    if (ieKey.getPublic() instanceof JCEECPublicKey) {
        pubKey = ECUtil.generatePublicKeyParameter(ieKey.getPublic());
        privKey = ECUtil.generatePrivateKeyParameter(ieKey.getPrivate());
    } else {
        pubKey = DHUtil.generatePublicKeyParameter(ieKey.getPublic());
        privKey = DHUtil.generatePrivateKeyParameter(ieKey.getPrivate());
    }
    this.engineParams = (IESParameterSpec) params;
    IESParameters p = new IESParameters(engineParams.getDerivationV(), engineParams.getEncodingV(), engineParams.getMacKeySize());
    this.state = opmode;
    buffer.reset();
    switch(opmode) {
        case Cipher.ENCRYPT_MODE:
        case Cipher.WRAP_MODE:
            cipher.init(true, privKey, pubKey, p);
            break;
        case Cipher.DECRYPT_MODE:
        case Cipher.UNWRAP_MODE:
            cipher.init(false, privKey, pubKey, p);
            break;
        default:
            System.out.println("eeek!");
    }
}