dhkeypairgenerator.java

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// Decompiled by Jad v1.5.8e2. Copyright 2001 Pavel Kouznetsov.
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// Decompiler options: packimports(3) fieldsfirst ansi space 
// Source File Name:   DHKeyPairGenerator.java

package org.bouncycastle.crypto.generators;

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

public class DHKeyPairGenerator
	implements AsymmetricCipherKeyPairGenerator
{

	private DHKeyGenerationParameters param;

	public DHKeyPairGenerator()
	{
	}

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

	public AsymmetricCipherKeyPair generateKeyPair()
	{
		int qLength = param.getStrength() - 1;
		DHParameters dhParams = param.getParameters();
		BigInteger p = dhParams.getP();
		BigInteger g = dhParams.getG();
		BigInteger x = new BigInteger(qLength, param.getRandom());
		BigInteger y = g.modPow(x, p);
		return new AsymmetricCipherKeyPair(new DHPublicKeyParameters(y, dhParams), new DHPrivateKeyParameters(x, dhParams));
	}
}