package org.bouncycastle.jcajce.provider.asymmetric.util;
import java.security.InvalidKeyException;
import java.security.PrivateKey;
import java.security.PublicKey;
import javax.crypto.interfaces.DHPrivateKey;
import javax.crypto.interfaces.DHPublicKey;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.crypto.params.DHParameters;
import org.bouncycastle.crypto.params.DHPrivateKeyParameters;
import org.bouncycastle.crypto.params.DHPublicKeyParameters;
/**
* utility class for converting jce/jca DH objects
* objects into their org.bouncycastle.crypto counterparts.
*/
public class DHUtil
{
static public AsymmetricKeyParameter generatePublicKeyParameter(
PublicKey key)
throws InvalidKeyException
{
if (key instanceof DHPublicKey)
{
DHPublicKey k = (DHPublicKey)key;
return new DHPublicKeyParameters(k.getY(),
new DHParameters(k.getParams().getP(), k.getParams().getG(), null, k.getParams().getL()));
}
throw new InvalidKeyException("can't identify DH public key.");
}
static public AsymmetricKeyParameter generatePrivateKeyParameter(
PrivateKey key)
throws InvalidKeyException
{
if (key instanceof DHPrivateKey)
{
DHPrivateKey k = (DHPrivateKey)key;
return new DHPrivateKeyParameters(k.getX(),
new DHParameters(k.getParams().getP(), k.getParams().getG(), null, k.getParams().getL()));
}
throw new InvalidKeyException("can't identify DH private key.");
}
}