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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.util;

import java.security.Key;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.jcajce.provider.util.AsymmetricKeyInfoConverter;

public abstract class BaseKeyFactorySpi
    extends java.security.KeyFactorySpi
    implements AsymmetricKeyInfoConverter
{
    protected PrivateKey engineGeneratePrivate(
        KeySpec keySpec)
        throws InvalidKeySpecException
    {
        if (keySpec instanceof PKCS8EncodedKeySpec)
        {
            try
            {
                return generatePrivate(PrivateKeyInfo.getInstance(((PKCS8EncodedKeySpec)keySpec).getEncoded()));
            }
            catch (Exception e)
            {
                throw new InvalidKeySpecException("encoded key spec not recognized: " + e.getMessage());
            }
        }
        else
        {
            throw new InvalidKeySpecException("key spec not recognized");
        }
    }

    protected PublicKey engineGeneratePublic(
        KeySpec keySpec)
        throws InvalidKeySpecException
    {
        if (keySpec instanceof X509EncodedKeySpec)
        {
            try
            {
                return generatePublic(SubjectPublicKeyInfo.getInstance(((X509EncodedKeySpec)keySpec).getEncoded()));
            }
            catch (Exception e)
            {
                throw new InvalidKeySpecException("encoded key spec not recognized: " + e.getMessage());
            }
        }
        else
        {
            throw new InvalidKeySpecException("key spec not recognized");
        }
    }

    protected KeySpec engineGetKeySpec(
        Key key,
        Class spec)
        throws InvalidKeySpecException
    {
        if (spec.isAssignableFrom(PKCS8EncodedKeySpec.class) && key.getFormat().equals("PKCS#8"))
        {
            return new PKCS8EncodedKeySpec(key.getEncoded());
        }
        else if (spec.isAssignableFrom(X509EncodedKeySpec.class) && key.getFormat().equals("X.509"))
        {
            return new X509EncodedKeySpec(key.getEncoded());
        }

        throw new InvalidKeySpecException("not implemented yet " + key + " " + spec);
    }
}