package org.bouncycastle.jcajce.provider.asymmetric.dsa;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidParameterException;
import java.security.KeyPair;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.DSAParameterSpec;
import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
import org.bouncycastle.crypto.generators.DSAKeyPairGenerator;
import org.bouncycastle.crypto.generators.DSAParametersGenerator;
import org.bouncycastle.crypto.params.DSAKeyGenerationParameters;
import org.bouncycastle.crypto.params.DSAParameters;
import org.bouncycastle.crypto.params.DSAPrivateKeyParameters;
import org.bouncycastle.crypto.params.DSAPublicKeyParameters;
public class KeyPairGeneratorSpi
extends java.security.KeyPairGenerator
{
DSAKeyGenerationParameters param;
DSAKeyPairGenerator engine = new DSAKeyPairGenerator();
int strength = 1024;
int certainty = 20;
SecureRandom random = new SecureRandom();
boolean initialised = false;
public KeyPairGeneratorSpi()
{
super("DSA");
}
public void initialize(
int strength,
SecureRandom random)
{
if (strength < 512 || strength > 1024 || strength % 64 != 0)
{
throw new InvalidParameterException("strength must be from 512 - 1024 and a multiple of 64");
}
this.strength = strength;
this.random = random;
}
public void initialize(
AlgorithmParameterSpec params,
SecureRandom random)
throws InvalidAlgorithmParameterException
{
if (!(params instanceof DSAParameterSpec))
{
throw new InvalidAlgorithmParameterException("parameter object not a DSAParameterSpec");
}
DSAParameterSpec dsaParams = (DSAParameterSpec)params;
param = new DSAKeyGenerationParameters(random, new DSAParameters(dsaParams.getP(), dsaParams.getQ(), dsaParams.getG()));
engine.init(param);
initialised = true;
}
public KeyPair generateKeyPair()
{
if (!initialised)
{
DSAParametersGenerator pGen = new DSAParametersGenerator();
pGen.init(strength, certainty, random);
param = new DSAKeyGenerationParameters(random, pGen.generateParameters());
engine.init(param);
initialised = true;
}
AsymmetricCipherKeyPair pair = engine.generateKeyPair();
DSAPublicKeyParameters pub = (DSAPublicKeyParameters)pair.getPublic();
DSAPrivateKeyParameters priv = (DSAPrivateKeyParameters)pair.getPrivate();
return new KeyPair(new BCDSAPublicKey(pub),
new BCDSAPrivateKey(priv));
}
}