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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 and up.

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package org.bouncycastle.asn1.x509;

import java.util.Enumeration;

import org.bouncycastle.asn1.ASN1BitString;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERBitString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.x500.X500Name;

/**
 * PKIX RFC-2459
 *
 * The X.509 v2 CRL syntax is as follows.  For signature calculation,
 * the data that is to be signed is ASN.1 DER encoded.
 *
 *  * CertificateList  ::=  SEQUENCE  {
 *      tbsCertList          TBSCertList,
 *      signatureAlgorithm   AlgorithmIdentifier,
 *      signatureValue       BIT STRING  }
 * 
 */
public class CertificateList
    extends ASN1Object
{
    TBSCertList            tbsCertList;
    AlgorithmIdentifier    sigAlgId;
    ASN1BitString          sig;
    boolean                isHashCodeSet = false;
    int                    hashCodeValue;

    public static CertificateList getInstance(
        ASN1TaggedObject obj,
        boolean          explicit)
    {
        return getInstance(ASN1Sequence.getInstance(obj, explicit));
    }

    public static CertificateList getInstance(
        Object  obj)
    {
        if (obj instanceof CertificateList)
        {
            return (CertificateList)obj;
        }
        else if (obj != null)
        {
            return new CertificateList(ASN1Sequence.getInstance(obj));
        }

        return null;
    }

    private CertificateList(
        ASN1Sequence seq)
    {
        if (seq.size() == 3)
        {
            tbsCertList = TBSCertList.getInstance(seq.getObjectAt(0));
            sigAlgId = AlgorithmIdentifier.getInstance(seq.getObjectAt(1));
            sig = DERBitString.getInstance(seq.getObjectAt(2));
        }
        else
        {
            throw new IllegalArgumentException("sequence wrong size for CertificateList");
        }
    }

    public TBSCertList getTBSCertList()
    {
        return tbsCertList;
    }

    public TBSCertList.CRLEntry[] getRevokedCertificates()
    {
        return tbsCertList.getRevokedCertificates();
    }

    public Enumeration getRevokedCertificateEnumeration()
    {
        return tbsCertList.getRevokedCertificateEnumeration();
    }

    public AlgorithmIdentifier getSignatureAlgorithm()
    {
        return sigAlgId;
    }

    public ASN1BitString getSignature()
    {
        return sig;
    }

    public int getVersionNumber()
    {
        return tbsCertList.getVersionNumber();
    }

    public X500Name getIssuer()
    {
        return tbsCertList.getIssuer();
    }

    public Time getThisUpdate()
    {
        return tbsCertList.getThisUpdate();
    }

    public Time getNextUpdate()
    {
        return tbsCertList.getNextUpdate();
    }

    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(3);

        v.add(tbsCertList);
        v.add(sigAlgId);
        v.add(sig);

        return new DERSequence(v);
    }

    public int hashCode()
    {
        if (!isHashCodeSet)
        {
            hashCodeValue = super.hashCode();
            isHashCodeSet = true;
        }

        return hashCodeValue;
    }
}