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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.x509;

import org.bouncycastle.asn1.ASN1Choice;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERTaggedObject;

public class AttCertIssuer
    extends ASN1Object
    implements ASN1Choice
{
    ASN1Encodable   obj;
    ASN1Primitive choiceObj;
    
    public static AttCertIssuer getInstance(
        Object  obj)
    {
        if (obj == null || obj instanceof AttCertIssuer)
        {
            return (AttCertIssuer)obj;
        }
        else if (obj instanceof V2Form)
        {
            return new AttCertIssuer(V2Form.getInstance(obj));
        }
        else if (obj instanceof GeneralNames)
        {
            return new AttCertIssuer((GeneralNames)obj);
        }
        else if (obj instanceof ASN1TaggedObject)
        {
            return new AttCertIssuer(V2Form.getInstance((ASN1TaggedObject)obj, false));
        }
        else if (obj instanceof ASN1Sequence)
        {
            return new AttCertIssuer(GeneralNames.getInstance(obj));
        }

        throw new IllegalArgumentException("unknown object in factory: " + obj.getClass().getName());
    }
    
    public static AttCertIssuer getInstance(
        ASN1TaggedObject obj,
        boolean          explicit)
    {
        return getInstance(obj.getObject()); // must be explicitly tagged
    }

    /**
     * Don't use this one if you are trying to be RFC 3281 compliant.
     * Use it for v1 attribute certificates only.
     * 
     * @param names our GeneralNames structure
     */
    public AttCertIssuer(
        GeneralNames  names)
    {
        obj = names;
        choiceObj = obj.toASN1Primitive();
    }
    
    public AttCertIssuer(
        V2Form  v2Form)
    {
        obj = v2Form;
        choiceObj = new DERTaggedObject(false, 0, obj);
    }

    public ASN1Encodable getIssuer()
    {
        return obj;
    }
    
    /**
     * Produce an object suitable for an ASN1OutputStream.
     *      *  AttCertIssuer ::= CHOICE {
     *       v1Form   GeneralNames,  -- MUST NOT be used in this
     *                               -- profile
     *       v2Form   [0] V2Form     -- v2 only
     *  }
     * 
     */
    public ASN1Primitive toASN1Primitive()
    {
        return choiceObj;
    }
}