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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.jcajce.provider.asymmetric.x509;

import java.security.cert.CRLException;

import org.bouncycastle.asn1.ASN1BitString;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.x509.CertificateList;
import org.bouncycastle.asn1.x509.Extension;
import org.bouncycastle.asn1.x509.IssuingDistributionPoint;
import org.bouncycastle.jcajce.util.JcaJceHelper;

class X509CRLObject
    extends X509CRLImpl
{
    private final Object        cacheLock = new Object();
    private X509CRLInternal     internalCRLValue;

    private volatile boolean    hashValueSet;
    private volatile int        hashValue;

    X509CRLObject(JcaJceHelper bcHelper, CertificateList c) throws CRLException
    {
        super(bcHelper, c, createSigAlgName(c), createSigAlgParams(c), isIndirectCRL(c));
    }

    public boolean equals(Object other)
    {
        if (this == other)
        {
            return true;
        }

        if (other instanceof X509CRLObject)
        {
            X509CRLObject otherBC = (X509CRLObject)other;

            if (this.hashValueSet && otherBC.hashValueSet)
            {
                if (this.hashValue != otherBC.hashValue)
                {
                    return false;
                }
            }
            else if (null == internalCRLValue || null == otherBC.internalCRLValue)
            {
                ASN1BitString signature = c.getSignature();
                if (null != signature && !signature.equals(otherBC.c.getSignature()))
                {
                    return false;
                }
            }
        }

        return getInternalCRL().equals(other);
    }

    public int hashCode()
    {
        if (!hashValueSet)
        {
            hashValue = getInternalCRL().hashCode();
            hashValueSet = true;
        }

        return hashValue;
    }

    private X509CRLInternal getInternalCRL()
    {
        synchronized (cacheLock)
        {
            if (null != internalCRLValue)
            {
                return internalCRLValue;
            }
        }

        byte[] encoding;
        try
        {
            encoding = getEncoded();
        }
        catch (CRLException e)
        {
            encoding = null;
        }

        X509CRLInternal temp = new X509CRLInternal(bcHelper, c, sigAlgName,sigAlgParams, isIndirect, encoding);

        synchronized (cacheLock)
        {
            if (null == internalCRLValue)
            {
                internalCRLValue = temp;
            }

            return internalCRLValue;
        }
    }

    private static String createSigAlgName(CertificateList c) throws CRLException
    {
        try
        {
            return X509SignatureUtil.getSignatureName(c.getSignatureAlgorithm());
        }
        catch (Exception e)
        {
            throw new CRLException("CRL contents invalid: " + e);
        }
    }

    private static byte[] createSigAlgParams(CertificateList c) throws CRLException
    {
        try
        {
            ASN1Encodable parameters = c.getSignatureAlgorithm().getParameters();
            if (null == parameters)
            {
                return null;
            }

            return parameters.toASN1Primitive().getEncoded(ASN1Encoding.DER);
        }
        catch (Exception e)
        {
            throw new CRLException("CRL contents invalid: " + e);
        }
    }

    private static boolean isIndirectCRL(CertificateList c) throws CRLException
    {
        try
        {
            byte[] extOctets = getExtensionOctets(c, Extension.issuingDistributionPoint.getId());
            if (null == extOctets)
            {
                return false;
            }

            return IssuingDistributionPoint.getInstance(extOctets).isIndirectCRL();
        }
        catch (Exception e)
        {
            throw new ExtCRLException("Exception reading IssuingDistributionPoint", e);
        }
    }
}