package org.bouncycastle.jcajce.provider.asymmetric.dh;
import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import javax.crypto.interfaces.DHPrivateKey;
import javax.crypto.interfaces.DHPublicKey;
import javax.crypto.spec.DHPrivateKeySpec;
import javax.crypto.spec.DHPublicKeySpec;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.asn1.x9.X9ObjectIdentifiers;
import org.bouncycastle.jcajce.provider.asymmetric.util.BaseKeyFactorySpi;
public class KeyFactorySpi
extends BaseKeyFactorySpi
{
public KeyFactorySpi()
{
}
protected KeySpec engineGetKeySpec(
Key key,
Class spec)
throws InvalidKeySpecException
{
if (spec.isAssignableFrom(DHPrivateKeySpec.class) && key instanceof DHPrivateKey)
{
DHPrivateKey k = (DHPrivateKey)key;
return new DHPrivateKeySpec(k.getX(), k.getParams().getP(), k.getParams().getG());
}
else if (spec.isAssignableFrom(DHPublicKeySpec.class) && key instanceof DHPublicKey)
{
DHPublicKey k = (DHPublicKey)key;
return new DHPublicKeySpec(k.getY(), k.getParams().getP(), k.getParams().getG());
}
return super.engineGetKeySpec(key, spec);
}
protected Key engineTranslateKey(
Key key)
throws InvalidKeyException
{
if (key instanceof DHPublicKey)
{
return new BCDHPublicKey((DHPublicKey)key);
}
else if (key instanceof DHPrivateKey)
{
return new BCDHPrivateKey((DHPrivateKey)key);
}
throw new InvalidKeyException("key type unknown");
}
protected PrivateKey engineGeneratePrivate(
KeySpec keySpec)
throws InvalidKeySpecException
{
if (keySpec instanceof DHPrivateKeySpec)
{
return new BCDHPrivateKey((DHPrivateKeySpec)keySpec);
}
return super.engineGeneratePrivate(keySpec);
}
protected PublicKey engineGeneratePublic(
KeySpec keySpec)
throws InvalidKeySpecException
{
if (keySpec instanceof DHPublicKeySpec)
{
return new BCDHPublicKey((DHPublicKeySpec)keySpec);
}
return super.engineGeneratePublic(keySpec);
}
public PrivateKey generatePrivate(PrivateKeyInfo keyInfo)
throws IOException
{
ASN1ObjectIdentifier algOid = keyInfo.getPrivateKeyAlgorithm().getAlgorithm();
if (algOid.equals(PKCSObjectIdentifiers.dhKeyAgreement))
{
return new BCDHPrivateKey(keyInfo);
}
else if (algOid.equals(X9ObjectIdentifiers.dhpublicnumber))
{
return new BCDHPrivateKey(keyInfo);
}
else
{
throw new IOException("algorithm identifier " + algOid + " in key not recognised");
}
}
public PublicKey generatePublic(SubjectPublicKeyInfo keyInfo)
throws IOException
{
ASN1ObjectIdentifier algOid = keyInfo.getAlgorithm().getAlgorithm();
if (algOid.equals(PKCSObjectIdentifiers.dhKeyAgreement))
{
return new BCDHPublicKey(keyInfo);
}
else if (algOid.equals(X9ObjectIdentifiers.dhpublicnumber))
{
return new BCDHPublicKey(keyInfo);
}
else
{
throw new IOException("algorithm identifier " + algOid + " in key not recognised");
}
}
}