package org.bouncycastle.jce.provider;
import java.security.InvalidKeyException;
import java.security.PrivateKey;
import java.security.PublicKey;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.crypto.params.ElGamalParameters;
import org.bouncycastle.crypto.params.ElGamalPrivateKeyParameters;
import org.bouncycastle.crypto.params.ElGamalPublicKeyParameters;
import org.bouncycastle.jce.interfaces.ElGamalPrivateKey;
import org.bouncycastle.jce.interfaces.ElGamalPublicKey;
/**
* utility class for converting jce/jca ElGamal objects
* objects into their org.bouncycastle.crypto counterparts.
*/
public class ElGamalUtil
{
static public AsymmetricKeyParameter generatePublicKeyParameter(
PublicKey key)
throws InvalidKeyException
{
if (key instanceof ElGamalPublicKey)
{
ElGamalPublicKey k = (ElGamalPublicKey)key;
return new ElGamalPublicKeyParameters(k.getY(),
new ElGamalParameters(k.getParams().getP(), k.getParams().getG()));
}
throw new InvalidKeyException("can't identify ElGamal public key.");
}
static public AsymmetricKeyParameter generatePrivateKeyParameter(
PrivateKey key)
throws InvalidKeyException
{
if (key instanceof ElGamalPrivateKey)
{
ElGamalPrivateKey k = (ElGamalPrivateKey)key;
return new ElGamalPrivateKeyParameters(k.getX(),
new ElGamalParameters(k.getParams().getP(), k.getParams().getG()));
}
throw new InvalidKeyException("can't identify ElGamal private key.");
}
}