package org.bouncycastle.crypto.generators;
import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
import org.bouncycastle.crypto.AsymmetricCipherKeyPairGenerator;
import org.bouncycastle.crypto.KeyGenerationParameters;
import org.bouncycastle.crypto.params.DHKeyGenerationParameters;
import org.bouncycastle.crypto.params.DHParameters;
import org.bouncycastle.crypto.params.DHPrivateKeyParameters;
import org.bouncycastle.crypto.params.DHPublicKeyParameters;
import java.math.BigInteger;
/**
* a basic Diffie-Hellman key pair generator.
*
* This generates keys consistent for use with the basic algorithm for
* Diffie-Hellman.
*/
public class DHBasicKeyPairGenerator
implements AsymmetricCipherKeyPairGenerator
{
private DHKeyGenerationParameters param;
public void init(
KeyGenerationParameters param)
{
this.param = (DHKeyGenerationParameters)param;
}
public AsymmetricCipherKeyPair generateKeyPair()
{
DHKeyGeneratorHelper helper = DHKeyGeneratorHelper.INSTANCE;
DHParameters dhp = param.getParameters();
BigInteger x = helper.calculatePrivate(dhp, param.getRandom());
BigInteger y = helper.calculatePublic(dhp, x);
return new AsymmetricCipherKeyPair(
new DHPublicKeyParameters(y, dhp),
new DHPrivateKeyParameters(x, dhp));
}
}