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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.path.validations;

import java.util.Collection;
import java.util.Iterator;

import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.cert.X509CRLHolder;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.cert.path.CertPathValidation;
import org.bouncycastle.cert.path.CertPathValidationContext;
import org.bouncycastle.cert.path.CertPathValidationException;
import org.bouncycastle.util.Memoable;
import org.bouncycastle.util.Selector;
import org.bouncycastle.util.Store;

public class CRLValidation
    implements CertPathValidation
{
    private Store crls;
    private X500Name workingIssuerName;

    public CRLValidation(X500Name trustAnchorName, Store crls)
    {
        this.workingIssuerName = trustAnchorName;
        this.crls = crls;
    }

    public void validate(CertPathValidationContext context, X509CertificateHolder certificate)
        throws CertPathValidationException
    {
        // TODO: add handling of delta CRLs
        Collection matches = crls.getMatches(new Selector()
        {
            public boolean match(Object obj)
            {
                X509CRLHolder crl = (X509CRLHolder)obj;

                return (crl.getIssuer().equals(workingIssuerName));
            }

            public Object clone()
            {
                return this;
            }
        });

        if (matches.isEmpty())
        {
            throw new CertPathValidationException("CRL for " + workingIssuerName + " not found");
        }

        for (Iterator it = matches.iterator(); it.hasNext();)
        {
            X509CRLHolder crl = (X509CRLHolder)it.next();

            // TODO: not quite right!
            if (crl.getRevokedCertificate(certificate.getSerialNumber()) != null)
            {
                throw new CertPathValidationException("Certificate revoked");
            }
        }

        this.workingIssuerName = certificate.getSubject();
    }

    public Memoable copy()
    {
        return new CRLValidation(workingIssuerName, crls);
    }

    public void reset(Memoable other)
    {
        CRLValidation v = (CRLValidation)other;

        this.workingIssuerName = v.workingIssuerName;
        this.crls = v.crls;
    }
}