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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.pkix.jcajce;

import java.security.cert.CertStore;
import java.security.cert.CertStoreException;
import java.security.cert.X509CRL;
import java.security.cert.X509Certificate;
import java.util.Date;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

import org.bouncycastle.jcajce.PKIXCRLStoreSelector;
import org.bouncycastle.util.Store;
import org.bouncycastle.util.StoreException;

abstract class PKIXCRLUtil
{
    static Set findCRLs(PKIXCRLStoreSelector crlselect, Date validityDate, List certStores, List pkixCrlStores)
        throws AnnotatedException
    {
        HashSet initialSet = new HashSet();

        // get complete CRL(s)
        try
        {
            findCRLs(initialSet, crlselect, pkixCrlStores);
            findCRLs(initialSet, crlselect, certStores);
        }
        catch (AnnotatedException e)
        {
            throw new AnnotatedException("Exception obtaining complete CRLs.", e);
        }

        Set finalSet = new HashSet();

        // based on RFC 5280 6.3.3
        for (Iterator it = initialSet.iterator(); it.hasNext();)
        {
            X509CRL crl = (X509CRL)it.next();

            Date nextUpdate = crl.getNextUpdate();
            if (nextUpdate == null || nextUpdate.after(validityDate))
            {
                X509Certificate cert = crlselect.getCertificateChecking();

                if (null == cert || crl.getThisUpdate().before(cert.getNotAfter()))
                {
                    finalSet.add(crl);
                }
            }
        }

        return finalSet;
    }

    /**
     * Add to a HashSet any and all CRLs found in the X509Store's that are matching the crlSelect
     * criteria.
     *
     * @param crls
     *            the {@link HashSet} to add the CRLs to.
     * @param crlSelect
     *            a {@link PKIXCRLStoreSelector} object that will be used to select the CRLs
     * @param crlStores
     *            a List containing only {@link Store} objects. These are used to search for CRLs
     */
    private static void findCRLs(HashSet crls, PKIXCRLStoreSelector crlSelect, List crlStores) throws AnnotatedException
    {
        AnnotatedException lastException = null;
        boolean foundValidStore = false;

        Iterator iter = crlStores.iterator();
        while (iter.hasNext())
        {
            Object obj = iter.next();
            if (obj instanceof Store)
            {
                Store store = (Store)obj;
                try
                {
                    crls.addAll(store.getMatches(crlSelect));
                    foundValidStore = true;
                }
                catch (StoreException e)
                {
                    lastException = new AnnotatedException("Exception searching in X.509 CRL store.", e);
                }
            }
            else
            {
                CertStore store = (CertStore)obj;
                try
                {
                    crls.addAll(PKIXCRLStoreSelector.getCRLs(crlSelect, store));
                    foundValidStore = true;
                }
                catch (CertStoreException e)
                {
                    lastException = new AnnotatedException("Exception searching in X.509 CRL store.", e);
                }
            }
        }
        if (!foundValidStore && lastException != null)
        {
            throw lastException;
        }
    }
}