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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 1.4. 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.cert.jcajce;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.security.NoSuchProviderException;
import java.security.Provider;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.CertificateParsingException;
import java.security.cert.X509Certificate;

import org.bouncycastle.cert.X509CertificateHolder;

/**
 * Converter for producing X509Certificate objects tied to a specific provider from X509CertificateHolder objects.
 */
public class JcaX509CertificateConverter
{
    private CertHelper helper = new DefaultCertHelper();

    /**
     * Base constructor, configure with the default provider.
     */
    public JcaX509CertificateConverter()
    {
        this.helper = new DefaultCertHelper();
    }

    /**
     * Set the provider to use from a Provider object.
     *
     * @param provider the provider to use.
     * @return the converter instance.
     */
    public JcaX509CertificateConverter setProvider(Provider provider)
    {
        this.helper = new ProviderCertHelper(provider);

        return this;
    }

    /**
     * Set the provider to use by name.
     *
     * @param providerName name of the provider to use.
     * @return the converter instance.
     */
    public JcaX509CertificateConverter setProvider(String providerName)
    {
        this.helper = new NamedCertHelper(providerName);

        return this;
    }

    /**
     * Use the configured converter to produce a X509Certificate object from a X509CertificateHolder object.
     *
     * @param certHolder  the holder to be converted
     * @return a X509Certificate object
     * @throws CertificateException if the conversion is unable to be made.
     */
    public X509Certificate getCertificate(X509CertificateHolder certHolder)
        throws CertificateException
    {
        try
        {
            CertificateFactory cFact = helper.getCertificateFactory("X.509");

            return (X509Certificate)cFact.generateCertificate(new ByteArrayInputStream(certHolder.getEncoded()));
        }
        catch (IOException e)
        {
            throw new ExCertificateParsingException("exception parsing certificate: " + e.getMessage(), e);
        }
        catch (NoSuchProviderException e)
        {
            throw new ExCertificateException("cannot find required provider:" + e.getMessage(), e);
        }
    }

    private static class ExCertificateParsingException
        extends CertificateParsingException
    {
        private Throwable cause;

        public ExCertificateParsingException(String msg, Throwable cause)
        {
            super(msg);

            this.cause = cause;
        }

        public Throwable getCause()
        {
            return cause;
        }
    }
    
    private static class ExCertificateException
        extends CertificateException
    {
        private Throwable cause;

        public ExCertificateException(String msg, Throwable cause)
        {
            super(msg);

            this.cause = cause;
        }

        public Throwable getCause()
        {
            return cause;
        }
    }
}