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The Long Term Stable (LTS) Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains the JCA/JCE provider and low-level API for the BC LTS version 2.73.7 for Java 8 and later.

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package org.bouncycastle.asn1.x509;

import java.math.BigInteger;

import org.bouncycastle.asn1.ASN1BitString;
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.ASN1TaggedObject;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.x500.X500Name;

public class IssuerSerial
    extends ASN1Object
{
    GeneralNames  issuer;
    ASN1Integer   serial;
    ASN1BitString issuerUID;

    public static IssuerSerial getInstance(
            Object  obj)
    {
        if (obj instanceof IssuerSerial)
        {
            return (IssuerSerial)obj;
        }

        if (obj != null)
        {
            return new IssuerSerial(ASN1Sequence.getInstance(obj));
        }

        return null;
    }

    public static IssuerSerial getInstance(
        ASN1TaggedObject obj,
        boolean          explicit)
    {
        return getInstance(ASN1Sequence.getInstance(obj, explicit));
    }
    
    private IssuerSerial(
        ASN1Sequence    seq)
    {
        if (seq.size() != 2 && seq.size() != 3)
        {
            throw new IllegalArgumentException("Bad sequence size: " + seq.size());
        }
        
        issuer = GeneralNames.getInstance(seq.getObjectAt(0));
        serial = ASN1Integer.getInstance(seq.getObjectAt(1));

        if (seq.size() == 3)
        {
            issuerUID = ASN1BitString.getInstance(seq.getObjectAt(2));
        }
    }

    public IssuerSerial(
        X500Name   issuer,
        BigInteger serial)
    {
        this(new GeneralNames(new GeneralName(issuer)), new ASN1Integer(serial));
    }

    public IssuerSerial(
        GeneralNames    issuer,
        BigInteger serial)
    {
        this(issuer, new ASN1Integer(serial));
    }

    public IssuerSerial(
        GeneralNames    issuer,
        ASN1Integer      serial)
    {
        this.issuer = issuer;
        this.serial = serial;
    }

    public GeneralNames getIssuer()
    {
        return issuer;
    }

    public ASN1Integer getSerial()
    {
        return serial;
    }

    public ASN1BitString getIssuerUID()
    {
        return issuerUID;
    }

    /**
     * Produce an object suitable for an ASN1OutputStream.
     *      *  IssuerSerial  ::=  SEQUENCE {
     *       issuer         GeneralNames,
     *       serial         CertificateSerialNumber,
     *       issuerUID      UniqueIdentifier OPTIONAL
     *  }
     * 
     */
    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(3);

        v.add(issuer);
        v.add(serial);

        if (issuerUID != null)
        {
            v.add(issuerUID);
        }

        return new DERSequence(v);
    }
}