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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.asn1.pkcs;

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.DERSequence;
import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.asn1.x509.X509Name;

public class IssuerAndSerialNumber
    extends ASN1Object
{
    X500Name name;
    ASN1Integer  certSerialNumber;

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

        return null;
    }

    private IssuerAndSerialNumber(
        ASN1Sequence    seq)
    {
        this.name = X500Name.getInstance(seq.getObjectAt(0));
        this.certSerialNumber = (ASN1Integer)seq.getObjectAt(1);
    }

    public IssuerAndSerialNumber(
        X509Name    name,
        BigInteger  certSerialNumber)
    {
        this.name = X500Name.getInstance(name.toASN1Primitive());
        this.certSerialNumber = new ASN1Integer(certSerialNumber);
    }

    public IssuerAndSerialNumber(
        X509Name    name,
        ASN1Integer  certSerialNumber)
    {
        this.name = X500Name.getInstance(name.toASN1Primitive());
        this.certSerialNumber = certSerialNumber;
    }

    public IssuerAndSerialNumber(
        X500Name    name,
        BigInteger  certSerialNumber)
    {
        this.name = name;
        this.certSerialNumber = new ASN1Integer(certSerialNumber);
    }

    public X500Name getName()
    {
        return name;
    }

    public ASN1Integer getCertificateSerialNumber()
    {
        return certSerialNumber;
    }

    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(2);

        v.add(name);
        v.add(certSerialNumber);

        return new DERSequence(v);
    }
}