Example usage for org.bouncycastle.crypto.engines ElGamalEngine processBlock

Introduction

In this page you can find the example usage for org.bouncycastle.crypto.engines ElGamalEngine processBlock.

Prototype

public byte[] processBlock(byte[] in, int inOff, int inLen) 

Source Link

Document

Process a single block using the basic ElGamal algorithm.

Usage

From source file:util.secure.ElGamal.java

License:Open Source License

@Override
public byte[] encryptWithPublicKey(byte[] data) {
    ElGamalParameters params = new ElGamalParameters(keys.getP(), keys.getG());
    ElGamalPublicKeyParameters pubKey = new ElGamalPublicKeyParameters(keys.getPublicKey(), params);

    ElGamalEngine e = new ElGamalEngine();
    e.init(true, pubKey);/*from  w  ww  .j ava  2  s. co  m*/
    return e.processBlock(data, 0, data.length);
}

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From source file:util.secure.ElGamal.java

License:Open Source License

public ElGamalEncrypt encryptForContract(byte[] data) {
    ElGamalParameters params = new ElGamalParameters(keys.getP(), keys.getG());
    ElGamalPublicKeyParameters pubKey = new ElGamalPublicKeyParameters(keys.getPublicKey(), params);

    ElGamalEngine e = new ElGamalEngine();
    e.init(true, pubKey);//  ww w . j av a2 s. co m
    byte[] m = e.processBlock(data, 0, data.length);
    BigInteger k = e.getK();
    BigInteger u = keys.getG().modPow(k, keys.getP());
    BigInteger v = (keys.getPublicKey().modPow(e.getK(), keys.getP()).multiply(new BigInteger(data)));
    return new ElGamalEncrypt(u, v, k, m);
}

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From source file:util.secure.ElGamal.java

License:Open Source License

@Override
public byte[] decryptWithPrivateKey(byte[] data) {
    ElGamalParameters params = new ElGamalParameters(keys.getP(), keys.getG());
    ElGamalPrivateKeyParameters privKey = new ElGamalPrivateKeyParameters(keys.getPrivateKey(), params);

    ElGamalEngine e = new ElGamalEngine();
    e.init(false, privKey);/*ww w .j a  v a  2 s.  co m*/

    return e.processBlock(data, 0, data.length);
}

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