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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 1.4.
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package org.bouncycastle.asn1.cmp;

import java.util.Enumeration;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERGeneralizedTime;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.GeneralName;

public class PKIHeader
    extends ASN1Object
{
    /**
     * Value for a "null" recipient or sender.
     */
    public static final GeneralName NULL_NAME = new GeneralName(X500Name.getInstance(new DERSequence()));

    public static final int CMP_1999 = 1;
    public static final int CMP_2000 = 2;

    private ASN1Integer pvno;
    private GeneralName sender;
    private GeneralName recipient;
    private DERGeneralizedTime messageTime;
    private AlgorithmIdentifier protectionAlg;
    private ASN1OctetString senderKID;       // KeyIdentifier
    private ASN1OctetString recipKID;        // KeyIdentifier
    private ASN1OctetString transactionID;
    private ASN1OctetString senderNonce;
    private ASN1OctetString recipNonce;
    private PKIFreeText freeText;
    private ASN1Sequence generalInfo;

    private PKIHeader(ASN1Sequence seq)
    {
        Enumeration en = seq.getObjects();

        pvno = ASN1Integer.getInstance(en.nextElement());
        sender = GeneralName.getInstance(en.nextElement());
        recipient = GeneralName.getInstance(en.nextElement());

        while (en.hasMoreElements())
        {
            ASN1TaggedObject tObj = (ASN1TaggedObject)en.nextElement();

            switch (tObj.getTagNo())
            {
            case 0:
                messageTime = DERGeneralizedTime.getInstance(tObj, true);
                break;
            case 1:
                protectionAlg = AlgorithmIdentifier.getInstance(tObj, true);
                break;
            case 2:
                senderKID = ASN1OctetString.getInstance(tObj, true);
                break;
            case 3:
                recipKID = ASN1OctetString.getInstance(tObj, true);
                break;
            case 4:
                transactionID = ASN1OctetString.getInstance(tObj, true);
                break;
            case 5:
                senderNonce = ASN1OctetString.getInstance(tObj, true);
                break;
            case 6:
                recipNonce = ASN1OctetString.getInstance(tObj, true);
                break;
            case 7:
                freeText = PKIFreeText.getInstance(tObj, true);
                break;
            case 8:
                generalInfo = ASN1Sequence.getInstance(tObj, true);
                break;
            default:
                throw new IllegalArgumentException("unknown tag number: " + tObj.getTagNo());
            }
        }
    }

    public static PKIHeader getInstance(Object o)
    {
        if (o instanceof PKIHeader)
        {
            return (PKIHeader)o;
        }

        if (o != null)
        {
            return new PKIHeader(ASN1Sequence.getInstance(o));
        }

        return null;
    }

    public PKIHeader(
        int pvno,
        GeneralName sender,
        GeneralName recipient)
    {
        this(new ASN1Integer(pvno), sender, recipient);
    }

    private PKIHeader(
        ASN1Integer pvno,
        GeneralName sender,
        GeneralName recipient)
    {
        this.pvno = pvno;
        this.sender = sender;
        this.recipient = recipient;
    }

    public ASN1Integer getPvno()
    {
        return pvno;
    }

    public GeneralName getSender()
    {
        return sender;
    }

    public GeneralName getRecipient()
    {
        return recipient;
    }

    public DERGeneralizedTime getMessageTime()
    {
        return messageTime;
    }

    public AlgorithmIdentifier getProtectionAlg()
    {
        return protectionAlg;
    }

    public ASN1OctetString getSenderKID()
    {
        return senderKID;
    }

    public ASN1OctetString getRecipKID()
    {
        return recipKID;
    }

    public ASN1OctetString getTransactionID()
    {
        return transactionID;
    }

    public ASN1OctetString getSenderNonce()
    {
        return senderNonce;
    }

    public ASN1OctetString getRecipNonce()
    {
        return recipNonce;
    }

    public PKIFreeText getFreeText()
    {
        return freeText;
    }

    public InfoTypeAndValue[] getGeneralInfo()
    {
        if (generalInfo == null)
        {
            return null;
        }
        InfoTypeAndValue[] results = new InfoTypeAndValue[generalInfo.size()];
        for (int i = 0; i < results.length; i++)
        {
            results[i]
                = InfoTypeAndValue.getInstance(generalInfo.getObjectAt(i));
        }
        return results;
    }

    /**
     *      *  PKIHeader ::= SEQUENCE {
     *            pvno                INTEGER     { cmp1999(1), cmp2000(2) },
     *            sender              GeneralName,
     *            -- identifies the sender
     *            recipient           GeneralName,
     *            -- identifies the intended recipient
     *            messageTime     [0] GeneralizedTime         OPTIONAL,
     *            -- time of production of this message (used when sender
     *            -- believes that the transport will be "suitable"; i.e.,
     *            -- that the time will still be meaningful upon receipt)
     *            protectionAlg   [1] AlgorithmIdentifier     OPTIONAL,
     *            -- algorithm used for calculation of protection bits
     *            senderKID       [2] KeyIdentifier           OPTIONAL,
     *            recipKID        [3] KeyIdentifier           OPTIONAL,
     *            -- to identify specific keys used for protection
     *            transactionID   [4] OCTET STRING            OPTIONAL,
     *            -- identifies the transaction; i.e., this will be the same in
     *            -- corresponding request, response, certConf, and PKIConf
     *            -- messages
     *            senderNonce     [5] OCTET STRING            OPTIONAL,
     *            recipNonce      [6] OCTET STRING            OPTIONAL,
     *            -- nonces used to provide replay protection, senderNonce
     *            -- is inserted by the creator of this message; recipNonce
     *            -- is a nonce previously inserted in a related message by
     *            -- the intended recipient of this message
     *            freeText        [7] PKIFreeText             OPTIONAL,
     *            -- this may be used to indicate context-specific instructions
     *            -- (this field is intended for human consumption)
     *            generalInfo     [8] SEQUENCE SIZE (1..MAX) OF
     *                                 InfoTypeAndValue     OPTIONAL
     *            -- this may be used to convey context-specific information
     *            -- (this field not primarily intended for human consumption)
     * }
     * 
     *
     * @return a basic ASN.1 object representation.
     */
    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector();

        v.add(pvno);
        v.add(sender);
        v.add(recipient);
        addOptional(v, 0, messageTime);
        addOptional(v, 1, protectionAlg);
        addOptional(v, 2, senderKID);
        addOptional(v, 3, recipKID);
        addOptional(v, 4, transactionID);
        addOptional(v, 5, senderNonce);
        addOptional(v, 6, recipNonce);
        addOptional(v, 7, freeText);
        addOptional(v, 8, generalInfo);

        return new DERSequence(v);
    }

    private void addOptional(ASN1EncodableVector v, int tagNo, ASN1Encodable obj)
    {
        if (obj != null)
        {
            v.add(new DERTaggedObject(true, tagNo, obj));
        }
    }
}