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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.CRLException;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509CRL;

import org.bouncycastle.cert.X509CRLHolder;

/**
 * Class for converting an X509CRLHolder into a corresponding X509CRL object tied to a
 * particular JCA provider.
 */
public class JcaX509CRLConverter
{
    private CertHelper helper = new DefaultCertHelper();

    /**
     * Base constructor, configure with the default provider.
     */
    public JcaX509CRLConverter()
    {
        this.helper = new DefaultCertHelper();
    }

    /**
     * Set the provider to use from a Provider object.
     *
     * @param provider the provider to use.
     * @return the converter instance.
     */
    public JcaX509CRLConverter 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 JcaX509CRLConverter setProvider(String providerName)
    {
        this.helper = new NamedCertHelper(providerName);

        return this;
    }

    /**
     * Use the configured converter to produce a X509CRL object from a X509CRLHolder object.
     *
     * @param crlHolder  the holder to be converted
     * @return a X509CRL object
     * @throws CRLException if the conversion is unable to be made.
     */
    public X509CRL getCRL(X509CRLHolder crlHolder)
        throws CRLException
    {
        try
        {
            CertificateFactory cFact = helper.getCertificateFactory("X.509");

            return (X509CRL)cFact.generateCRL(new ByteArrayInputStream(crlHolder.getEncoded()));
        }
        catch (IOException e)
        {
            throw new ExCRLException("exception parsing certificate: " + e.getMessage(), e);
        }
        catch (NoSuchProviderException e)
        {
            throw new ExCRLException("cannot find required provider:" + e.getMessage(), e);
        }
        catch (CertificateException e)
        {
            throw new ExCRLException("cannot create factory: " + e.getMessage(), e);
        }
    }

    private static class ExCRLException
        extends CRLException
    {
        private Throwable cause;

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

            this.cause = cause;
        }

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