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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.pkcs.jcajce;

import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.Provider;
import java.security.PublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.X509EncodedKeySpec;
import java.util.Hashtable;

import org.bouncycastle.asn1.pkcs.CertificationRequest;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.asn1.x9.X9ObjectIdentifiers;
import org.bouncycastle.jcajce.DefaultJcaJceHelper;
import org.bouncycastle.jcajce.JcaJceHelper;
import org.bouncycastle.jcajce.NamedJcaJceHelper;
import org.bouncycastle.jcajce.ProviderJcaJceHelper;
import org.bouncycastle.pkcs.PKCS10CertificationRequest;

public class JcaPKCS10CertificationRequest
    extends PKCS10CertificationRequest
{
    private static Hashtable keyAlgorithms = new Hashtable();

    static
    {
        //
        // key types
        //
        keyAlgorithms.put(PKCSObjectIdentifiers.rsaEncryption, "RSA");
        keyAlgorithms.put(X9ObjectIdentifiers.id_dsa, "DSA");
    }

    private JcaJceHelper helper = new DefaultJcaJceHelper();

    public JcaPKCS10CertificationRequest(CertificationRequest certificationRequest)
    {
        super(certificationRequest);
    }

    public JcaPKCS10CertificationRequest(byte[] encoding)
        throws IOException
    {
        super(encoding);
    }

    public JcaPKCS10CertificationRequest(PKCS10CertificationRequest requestHolder)
    {
        super(requestHolder.toASN1Structure());
    }

    public JcaPKCS10CertificationRequest setProvider(String providerName)
    {
        helper = new NamedJcaJceHelper(providerName);

        return this;
    }

    public JcaPKCS10CertificationRequest setProvider(Provider provider)
    {
        helper = new ProviderJcaJceHelper(provider);

        return this;
    }

    public PublicKey getPublicKey()
        throws InvalidKeyException, NoSuchAlgorithmException
    {
        try
        {
            SubjectPublicKeyInfo keyInfo = this.getSubjectPublicKeyInfo();
            X509EncodedKeySpec xspec = new X509EncodedKeySpec(keyInfo.getEncoded());
            KeyFactory kFact;

            try
            {
                kFact = helper.createKeyFactory(keyInfo.getAlgorithm().getAlgorithm().getId());
            }
            catch (NoSuchAlgorithmException e)
            {
                //
                // try an alternate
                //
                if (keyAlgorithms.get(keyInfo.getAlgorithm().getAlgorithm()) != null)
                {
                    String  keyAlgorithm = (String)keyAlgorithms.get(keyInfo.getAlgorithm().getAlgorithm());

                    kFact = helper.createKeyFactory(keyAlgorithm);
                }
                else
                {
                    throw e;
                }
            }

            return kFact.generatePublic(xspec);
        }
        catch (InvalidKeySpecException e)
        {
            throw new InvalidKeyException("error decoding public key");
        }
        catch (IOException e)
        {
            throw new InvalidKeyException("error extracting key encoding");
        }
        catch (NoSuchProviderException e)
        {
            throw new NoSuchAlgorithmException("cannot find provider: " + e.getMessage());
        }
    }
}