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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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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;
import org.bouncycastle.jcajce.provider.asymmetric.util.ExtendedInvalidKeySpecException;

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)
        {
            try
            {
                return new BCDHPublicKey((DHPublicKeySpec)keySpec);
            }
            catch (IllegalArgumentException e)
            {
                throw new ExtendedInvalidKeySpecException(e.getMessage(), e);
            }
        }

        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");
        }
    }
}