package org.bouncycastle.jce.provider;
import java.security.InvalidKeyException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.interfaces.DSAPrivateKey;
import java.security.interfaces.DSAPublicKey;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.crypto.params.DSAParameters;
import org.bouncycastle.crypto.params.DSAPrivateKeyParameters;
import org.bouncycastle.crypto.params.DSAPublicKeyParameters;
/**
* utility class for converting jce/jca DSA objects
* objects into their org.bouncycastle.crypto counterparts.
*/
public class DSAUtil
{
static public AsymmetricKeyParameter generatePublicKeyParameter(
PublicKey key)
throws InvalidKeyException
{
if (key instanceof DSAPublicKey)
{
DSAPublicKey k = (DSAPublicKey)key;
return new DSAPublicKeyParameters(k.getY(),
new DSAParameters(k.getParams().getP(), k.getParams().getQ(), k.getParams().getG()));
}
throw new InvalidKeyException("can't identify DSA public key: " + key.getClass().getName());
}
static public AsymmetricKeyParameter generatePrivateKeyParameter(
PrivateKey key)
throws InvalidKeyException
{
if (key instanceof DSAPrivateKey)
{
DSAPrivateKey k = (DSAPrivateKey)key;
return new DSAPrivateKeyParameters(k.getX(),
new DSAParameters(k.getParams().getP(), k.getParams().getQ(), k.getParams().getG()));
}
throw new InvalidKeyException("can't identify DSA private key.");
}
}