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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified.

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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;
    }
}