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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 to JDK 1.8. 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;

import java.math.BigInteger;
import java.util.Date;
import java.util.List;
import java.util.Set;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.x509.Extension;
import org.bouncycastle.asn1.x509.Extensions;
import org.bouncycastle.asn1.x509.GeneralNames;
import org.bouncycastle.asn1.x509.TBSCertList;

/**
 * Holding class for an X.509 CRL Entry structure.
 */
public class X509CRLEntryHolder
{
    private TBSCertList.CRLEntry entry;
    private GeneralNames ca;

    X509CRLEntryHolder(TBSCertList.CRLEntry entry, boolean isIndirect, GeneralNames previousCA)
    {
        this.entry = entry;
        this.ca = previousCA;

        if (isIndirect && entry.hasExtensions())
        {
            Extension currentCaName = entry.getExtensions().getExtension(Extension.certificateIssuer);

            if (currentCaName != null)
            {
                ca = GeneralNames.getInstance(currentCaName.getParsedValue());
            }
        }
    }

    /**
     * Return the serial number of the certificate associated with this CRLEntry.
     *
     * @return the revoked certificate's serial number.
     */
    public BigInteger getSerialNumber()
    {
        return entry.getUserCertificate().getValue();
    }

    /**
     * Return the date on which the certificate associated with this CRLEntry was revoked.
     *
     * @return the revocation date for the revoked certificate.
     */
    public Date getRevocationDate()
    {
        return entry.getRevocationDate().getDate();
    }

    /**
     * Return whether or not the holder's CRL entry contains extensions.
     *
     * @return true if extension are present, false otherwise.
     */
    public boolean hasExtensions()
    {
        return entry.hasExtensions();
    }

    /**
     * Return the available names for the certificate issuer for the certificate referred to by this CRL entry.
     * 
     * Note: this will be the issuer of the CRL unless it has been specified that the CRL is indirect
     * in the IssuingDistributionPoint extension and either a previous entry, or the current one,
     * has specified a different CA via the certificateIssuer extension.
     * 
     *
     * @return the revoked certificate's issuer.
     */
    public GeneralNames getCertificateIssuer()
    {
        return this.ca;
    }

    /**
     * Look up the extension associated with the passed in OID.
     *
     * @param oid the OID of the extension of interest.
     *
     * @return the extension if present, null otherwise.
     */
    public Extension getExtension(ASN1ObjectIdentifier oid)
    {
        Extensions extensions = entry.getExtensions();

        if (extensions != null)
        {
            return extensions.getExtension(oid);
        }

        return null;
    }

    /**
     * Return the extensions block associated with this CRL entry if there is one.
     *
     * @return the extensions block, null otherwise.
     */
    public Extensions getExtensions()
    {
        return entry.getExtensions();
    }

    /**
     * Returns a list of ASN1ObjectIdentifier objects representing the OIDs of the
     * extensions contained in this holder's CRL entry.
     *
     * @return a list of extension OIDs.
     */
    public List getExtensionOIDs()
    {
        return CertUtils.getExtensionOIDs(entry.getExtensions());
    }

    /**
     * Returns a set of ASN1ObjectIdentifier objects representing the OIDs of the
     * critical extensions contained in this holder's CRL entry.
     *
     * @return a set of critical extension OIDs.
     */
    public Set getCriticalExtensionOIDs()
    {
        return CertUtils.getCriticalExtensionOIDs(entry.getExtensions());
    }

    /**
     * Returns a set of ASN1ObjectIdentifier objects representing the OIDs of the
     * non-critical extensions contained in this holder's CRL entry.
     *
     * @return a set of non-critical extension OIDs.
     */
    public Set getNonCriticalExtensionOIDs()
    {
        return CertUtils.getNonCriticalExtensionOIDs(entry.getExtensions());
    }
}