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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 to JDK 1.8. 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.openssl.jcajce;

import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.PrivateKey;
import java.security.Provider;
import java.security.PublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.asn1.x9.X9ObjectIdentifiers;
import org.bouncycastle.jcajce.util.DefaultJcaJceHelper;
import org.bouncycastle.jcajce.util.JcaJceHelper;
import org.bouncycastle.jcajce.util.NamedJcaJceHelper;
import org.bouncycastle.jcajce.util.ProviderJcaJceHelper;
import org.bouncycastle.openssl.PEMException;
import org.bouncycastle.openssl.PEMKeyPair;

public class JcaPEMKeyConverter
{
    private JcaJceHelper helper = new DefaultJcaJceHelper();

    private static final Map algorithms = new HashMap();

    static
    {
        algorithms.put(X9ObjectIdentifiers.id_ecPublicKey, "ECDSA");
        algorithms.put(PKCSObjectIdentifiers.rsaEncryption, "RSA");
        algorithms.put(X9ObjectIdentifiers.id_dsa, "DSA");
    }

    public JcaPEMKeyConverter setProvider(Provider provider)
    {
        this.helper = new ProviderJcaJceHelper(provider);

        return this;
    }

    public JcaPEMKeyConverter setProvider(String providerName)
    {
        this.helper = new NamedJcaJceHelper(providerName);

        return this;
    }

    public KeyPair getKeyPair(PEMKeyPair keyPair)
        throws PEMException
    {
        try
        {
            KeyFactory keyFactory = getKeyFactory(keyPair.getPrivateKeyInfo().getPrivateKeyAlgorithm());

            return new KeyPair(keyFactory.generatePublic(new X509EncodedKeySpec(keyPair.getPublicKeyInfo().getEncoded())),
                                keyFactory.generatePrivate(new PKCS8EncodedKeySpec(keyPair.getPrivateKeyInfo().getEncoded())));
        }
        catch (Exception e)
        {
            throw new PEMException("unable to convert key pair: " + e.getMessage(), e);
        }
    }

    public PublicKey getPublicKey(SubjectPublicKeyInfo publicKeyInfo)
        throws PEMException
    {
        try
        {
            KeyFactory keyFactory = getKeyFactory(publicKeyInfo.getAlgorithm());

            return keyFactory.generatePublic(new X509EncodedKeySpec(publicKeyInfo.getEncoded()));
        }
        catch (Exception e)
        {
            throw new PEMException("unable to convert key pair: " + e.getMessage(), e);
        }
    }

    public PrivateKey getPrivateKey(PrivateKeyInfo privateKeyInfo)
        throws PEMException
    {
        try
        {
            KeyFactory keyFactory = getKeyFactory(privateKeyInfo.getPrivateKeyAlgorithm());

            return keyFactory.generatePrivate(new PKCS8EncodedKeySpec(privateKeyInfo.getEncoded()));
        }
        catch (Exception e)
        {
            throw new PEMException("unable to convert key pair: " + e.getMessage(), e);
        }
    }

    private KeyFactory getKeyFactory(AlgorithmIdentifier algId)
        throws NoSuchAlgorithmException, NoSuchProviderException
    {
        ASN1ObjectIdentifier algorithm =  algId.getAlgorithm();

        String algName = (String)algorithms.get(algorithm);

        if (algName == null)
        {
            algName = algorithm.getId();
        }

        try
        {
            return helper.createKeyFactory(algName);
        }
        catch (NoSuchAlgorithmException e)
        {
            if (algName.equals("ECDSA"))
            {
                return helper.createKeyFactory("EC"); // try a fall back
            }

            throw e;
        }
    }
}