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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.cms;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1Set;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;

/**
 * RFC 5652: OriginatorInfo object.
 *  * RFC 3369:
 *
 * OriginatorInfo ::= SEQUENCE {
 *     certs [0] IMPLICIT CertificateSet OPTIONAL,
 *     crls  [1] IMPLICIT CertificateRevocationLists OPTIONAL 
 * }
 * CertificateRevocationLists ::= SET OF CertificateList (from X.509)
 *
 * RFC 3582 / 5652:
 *
 * OriginatorInfo ::= SEQUENCE {
 *     certs [0] IMPLICIT CertificateSet OPTIONAL,
 *     crls  [1] IMPLICIT RevocationInfoChoices OPTIONAL
 * }
 * RevocationInfoChoices ::= SET OF RevocationInfoChoice
 * RevocationInfoChoice ::= CHOICE {
 *     crl CertificateList,
 *     other [1] IMPLICIT OtherRevocationInfoFormat }
 *
 * OtherRevocationInfoFormat ::= SEQUENCE {
 *     otherRevInfoFormat OBJECT IDENTIFIER,
 *     otherRevInfo ANY DEFINED BY otherRevInfoFormat }
 * 
 * 
 * TODO: RevocationInfoChoices / RevocationInfoChoice.
 *       Constructor using CertificateSet, CertificationInfoChoices
 */
public class OriginatorInfo
    extends ASN1Object
{
    private ASN1Set certs;
    private ASN1Set crls;
    
    public OriginatorInfo(
        ASN1Set certs,
        ASN1Set crls)
    {
        this.certs = certs;
        this.crls = crls;
    }
    
    private OriginatorInfo(
        ASN1Sequence seq)
    {
        switch (seq.size())
        {
        case 0:     // empty
            break;
        case 1:
            ASN1TaggedObject o = (ASN1TaggedObject)seq.getObjectAt(0);
            switch (o.getTagNo())
            {
            case 0 :
                certs = ASN1Set.getInstance(o, false);
                break;
            case 1 :
                crls = ASN1Set.getInstance(o, false);
                break;
            default:
                throw new IllegalArgumentException("Bad tag in OriginatorInfo: " + o.getTagNo());
            }
            break;
        case 2:
            certs = ASN1Set.getInstance((ASN1TaggedObject)seq.getObjectAt(0), false);
            crls  = ASN1Set.getInstance((ASN1TaggedObject)seq.getObjectAt(1), false);
            break;
        default:
            throw new IllegalArgumentException("OriginatorInfo too big");
        }
    }
    
    /**
     * Return an OriginatorInfo object from a tagged object.
     *
     * @param obj the tagged object holding the object we want.
     * @param explicit true if the object is meant to be explicitly
     *              tagged false otherwise.
     * @exception IllegalArgumentException if the object held by the
     *          tagged object cannot be converted.
     */
    public static OriginatorInfo getInstance(
        ASN1TaggedObject    obj,
        boolean             explicit)
    {
        return getInstance(ASN1Sequence.getInstance(obj, explicit));
    }
    
    /**
     * Return an OriginatorInfo object from the given object.
     * 

     * Accepted inputs:
     * 

     *  null → null
     * 
 {@link OriginatorInfo} object
     * 
 {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with OriginatorInfo structure inside
     * 
     *
     * @param obj the object we want converted.
     * @exception IllegalArgumentException if the object cannot be converted.
     */
    public static OriginatorInfo getInstance(
        Object obj)
    {
        if (obj instanceof OriginatorInfo)
        {
            return (OriginatorInfo)obj;
        }
        else if (obj != null)
        {
            return new OriginatorInfo(ASN1Sequence.getInstance(obj));
        }

        return null;
    }
    
    public ASN1Set getCertificates()
    {
        return certs;
    }

    public ASN1Set getCRLs()
    {
        return crls;
    }

    /** 
     * Produce an object suitable for an ASN1OutputStream.
     */
    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(2);

        if (certs != null)
        {
            v.add(new DERTaggedObject(false, 0, certs));
        }
        
        if (crls != null)
        {
            v.add(new DERTaggedObject(false, 1, crls));
        }
        
        return new DERSequence(v);
    }
}