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package org.spongycastle.jcajce.provider.asymmetric.ecgost;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidParameterException;
import java.security.KeyPair;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;
import org.spongycastle.asn1.cryptopro.ECGOST3410NamedCurves;
import org.spongycastle.crypto.AsymmetricCipherKeyPair;
import org.spongycastle.crypto.generators.ECKeyPairGenerator;
import org.spongycastle.crypto.params.ECDomainParameters;
import org.spongycastle.crypto.params.ECKeyGenerationParameters;
import org.spongycastle.crypto.params.ECPrivateKeyParameters;
import org.spongycastle.crypto.params.ECPublicKeyParameters;
import org.spongycastle.jce.provider.BouncyCastleProvider;
import org.spongycastle.jce.spec.ECNamedCurveGenParameterSpec;
import org.spongycastle.jce.spec.ECNamedCurveParameterSpec;
import org.spongycastle.jce.spec.ECParameterSpec;
public class KeyPairGeneratorSpi
extends java.security.KeyPairGenerator
{
ECParameterSpec ecParams = null;
ECKeyPairGenerator engine = new ECKeyPairGenerator();
String algorithm = "ECGOST3410";
ECKeyGenerationParameters param;
int strength = 239;
SecureRandom random = null;
boolean initialised = false;
public KeyPairGeneratorSpi()
{
super("ECGOST3410");
}
public void initialize(
int strength,
SecureRandom random)
{
this.strength = strength;
this.random = random;
if (ecParams != null)
{
param = new ECKeyGenerationParameters(new ECDomainParameters(ecParams.getCurve(), ecParams.getG(), ecParams.getN()), random);
engine.init(param);
initialised = true;
}
else
{
throw new InvalidParameterException("unknown key size.");
}
}
public void initialize(
AlgorithmParameterSpec params,
SecureRandom random)
throws InvalidAlgorithmParameterException
{
if (params instanceof ECParameterSpec)
{
ECParameterSpec p = (ECParameterSpec)params;
this.ecParams = p;
param = new ECKeyGenerationParameters(new ECDomainParameters(p.getCurve(), p.getG(), p.getN()), random);
engine.init(param);
initialised = true;
}
else if (params instanceof ECNamedCurveGenParameterSpec)
{
String curveName;
curveName = ((ECNamedCurveGenParameterSpec)params).getName();
ECDomainParameters ecP = ECGOST3410NamedCurves.getByName(curveName);
if (ecP == null)
{
throw new InvalidAlgorithmParameterException("unknown curve name: " + curveName);
}
this.ecParams = new ECNamedCurveParameterSpec(
curveName,
ecP.getCurve(),
ecP.getG(),
ecP.getN(),
ecP.getH(),
ecP.getSeed());
param = new ECKeyGenerationParameters(new ECDomainParameters(ecParams.getCurve(), ecParams.getG(), ecParams.getN()), random);
engine.init(param);
initialised = true;
}
else if (params == null && BouncyCastleProvider.CONFIGURATION.getEcImplicitlyCa() != null)
{
ECParameterSpec p = BouncyCastleProvider.CONFIGURATION.getEcImplicitlyCa();
this.ecParams = null;
param = new ECKeyGenerationParameters(new ECDomainParameters(p.getCurve(), p.getG(), p.getN()), random);
engine.init(param);
initialised = true;
}
else if (params == null && BouncyCastleProvider.CONFIGURATION.getEcImplicitlyCa() == null)
{
throw new InvalidAlgorithmParameterException("null parameter passed but no implicitCA set");
}
else
{
throw new InvalidAlgorithmParameterException("parameter object not a ECParameterSpec: " + params.getClass().getName());
}
}
public KeyPair generateKeyPair()
{
if (!initialised)
{
throw new IllegalStateException("EC Key Pair Generator not initialised");
}
AsymmetricCipherKeyPair pair = engine.generateKeyPair();
ECPublicKeyParameters pub = (ECPublicKeyParameters)pair.getPublic();
ECPrivateKeyParameters priv = (ECPrivateKeyParameters)pair.getPrivate();
if (ecParams == null)
{
return new KeyPair(new BCECGOST3410PublicKey(algorithm, pub),
new BCECGOST3410PrivateKey(algorithm, priv));
}
else
{
ECParameterSpec p = (ECParameterSpec)ecParams;
BCECGOST3410PublicKey pubKey = new BCECGOST3410PublicKey(algorithm, pub, p);
return new KeyPair(pubKey,
new BCECGOST3410PrivateKey(algorithm, priv, pubKey, p));
}
}
}
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