elgamalkeypairgenerator.java

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// Decompiled by Jad v1.5.8e2. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://kpdus.tripod.com/jad.html
// Decompiler options: packimports(3) fieldsfirst ansi space 
// Source File Name:   ElGamalKeyPairGenerator.java

package org.bouncycastle.crypto.generators;

import java.math.BigInteger;
import org.bouncycastle.crypto.*;
import org.bouncycastle.crypto.params.*;

public class ElGamalKeyPairGenerator
	implements AsymmetricCipherKeyPairGenerator
{

	private ElGamalKeyGenerationParameters param;

	public ElGamalKeyPairGenerator()
	{
	}

	public void init(KeyGenerationParameters param)
	{
		this.param = (ElGamalKeyGenerationParameters)param;
	}

	public AsymmetricCipherKeyPair generateKeyPair()
	{
		int qLength = param.getStrength() - 1;
		ElGamalParameters elParams = param.getParameters();
		BigInteger p = elParams.getP();
		BigInteger g = elParams.getG();
		BigInteger x = new BigInteger(qLength, param.getRandom());
		BigInteger y = g.modPow(x, p);
		return new AsymmetricCipherKeyPair(new ElGamalPublicKeyParameters(y, elParams), new ElGamalPrivateKeyParameters(x, elParams));
	}
}