package org.bouncycastle.jcajce.provider.asymmetric.dsa;
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.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.oiw.OIWObjectIdentifiers;
import org.bouncycastle.asn1.x9.X9ObjectIdentifiers;
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
{
public static final ASN1ObjectIdentifier[] dsaOids =
{
X9ObjectIdentifiers.id_dsa,
OIWObjectIdentifiers.dsaWithSHA1
};
public static boolean isDsaOid(
ASN1ObjectIdentifier algOid)
{
for (int i = 0; i != dsaOids.length; i++)
{
if (algOid.equals(dsaOids[i]))
{
return true;
}
}
return false;
}
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.");
}
}