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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for Android. Android ships with a stripped-down version of Bouncy Castle - this causes classloader collisions if you try to add an alternative (updated/complete) Bouncy Castle jar. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5.

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package org.spongycastle.cert;

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

import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.x509.TBSCertList;
import org.spongycastle.asn1.x509.X509Extension;
import org.spongycastle.asn1.x509.X509Extensions;

/**
 * Holding class for an X.509 CRL Entry structure.
 */
public class X509CRLEntryHolder
{
    private TBSCertList.CRLEntry entry;
    private X509Extensions extensions;

    X509CRLEntryHolder(TBSCertList.CRLEntry entry)
    {
        this.entry = entry;
        this.extensions = entry.getExtensions();
    }

    /**
     * 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     * Return the date on which the certificate associated with this CRLEntry was revoked.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 extensions != null;
    }

    /**
     * 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 X509Extension getExtension(ASN1ObjectIdentifier oid)
    {
        if (extensions != null)
        {
            return extensions.getExtension(oid);
        }

        return null;
    }

    /**
     * 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(extensions);
    }

    /**
     * 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(extensions);
    }

    /**
     * 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(extensions);
    }
}