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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.esf;

import java.math.BigInteger;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1UTCTime;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.x500.X500Name;

/**
 *  *  CrlIdentifier ::= SEQUENCE 
 * {
 *   crlissuer    Name,
 *   crlIssuedTime  UTCTime,
 *   crlNumber    INTEGER OPTIONAL
 * }
 * 
 */
public class CrlIdentifier
    extends ASN1Object
{
    private X500Name crlIssuer;
    private ASN1UTCTime crlIssuedTime;
    private ASN1Integer crlNumber;

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

        return null;
    }

    private CrlIdentifier(ASN1Sequence seq)
    {
        if (seq.size() < 2 || seq.size() > 3)
        {
            throw new IllegalArgumentException();
        }
        this.crlIssuer = X500Name.getInstance(seq.getObjectAt(0));
        this.crlIssuedTime = ASN1UTCTime.getInstance(seq.getObjectAt(1));
        if (seq.size() > 2)
        {
            this.crlNumber = ASN1Integer.getInstance(seq.getObjectAt(2));
        }
    }

    public CrlIdentifier(X500Name crlIssuer, ASN1UTCTime crlIssuedTime)
    {
        this(crlIssuer, crlIssuedTime, null);
    }

    public CrlIdentifier(X500Name crlIssuer, ASN1UTCTime crlIssuedTime,
                         BigInteger crlNumber)
    {
        this.crlIssuer = crlIssuer;
        this.crlIssuedTime = crlIssuedTime;
        if (null != crlNumber)
        {
            this.crlNumber = new ASN1Integer(crlNumber);
        }
    }

    public X500Name getCrlIssuer()
    {
        return this.crlIssuer;
    }

    public ASN1UTCTime getCrlIssuedTime()
    {
        return this.crlIssuedTime;
    }

    public BigInteger getCrlNumber()
    {
        if (null == this.crlNumber)
        {
            return null;
        }
        return this.crlNumber.getValue();
    }

    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(3);
        v.add(this.crlIssuer.toASN1Primitive());
        v.add(this.crlIssuedTime);
        if (null != this.crlNumber)
        {
            v.add(this.crlNumber);
        }
        return new DERSequence(v);
    }

}