dsakeypairgenerator.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:   DSAKeyPairGenerator.java

package org.bouncycastle.crypto.generators;

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

public class DSAKeyPairGenerator
	implements AsymmetricCipherKeyPairGenerator
{

	private static BigInteger ZERO = BigInteger.valueOf(0L);
	private DSAKeyGenerationParameters param;

	public DSAKeyPairGenerator()
	{
	}

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

	public AsymmetricCipherKeyPair generateKeyPair()
	{
		DSAParameters dsaParams = param.getParameters();
		java.security.SecureRandom random = param.getRandom();
		BigInteger q = dsaParams.getQ();
		BigInteger p = dsaParams.getP();
		BigInteger g = dsaParams.getG();
		BigInteger x;
		do
			x = new BigInteger(160, random);
		while (x.equals(ZERO) || x.compareTo(q) >= 0);
		BigInteger y = g.modPow(x, p);
		return new AsymmetricCipherKeyPair(new DSAPublicKeyParameters(y, dsaParams), new DSAPrivateKeyParameters(x, dsaParams));
	}

}