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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 org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1GeneralizedTime;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.GeneralName;

public class PKIHeaderBuilder
{
    private ASN1Integer pvno;
    private GeneralName sender;
    private GeneralName recipient;
    private ASN1GeneralizedTime 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;

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

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

    public PKIHeaderBuilder setMessageTime(ASN1GeneralizedTime time)
    {
        messageTime = time;

        return this;
    }

    public PKIHeaderBuilder setProtectionAlg(AlgorithmIdentifier aid)
    {
        protectionAlg = aid;

        return this;
    }

    public PKIHeaderBuilder setSenderKID(byte[] kid)
    {
        return setSenderKID(kid == null ? null : new DEROctetString(kid));
    }

    public PKIHeaderBuilder setSenderKID(ASN1OctetString kid)
    {
        senderKID = kid;

        return this;
    }

    public PKIHeaderBuilder setRecipKID(byte[] kid)
    {
        return setRecipKID(kid == null ? null : new DEROctetString(kid));
    }

    public PKIHeaderBuilder setRecipKID(DEROctetString kid)
    {
        recipKID = kid;

        return this;
    }

    public PKIHeaderBuilder setTransactionID(byte[] tid)
    {
        return setTransactionID(tid == null ? null : new DEROctetString(tid));
    }

    public PKIHeaderBuilder setTransactionID(ASN1OctetString tid)
    {
        transactionID = tid;

        return this;
    }

    public PKIHeaderBuilder setSenderNonce(byte[] nonce)
    {
        return setSenderNonce(nonce == null ? null : new DEROctetString(nonce));
    }

    public PKIHeaderBuilder setSenderNonce(ASN1OctetString nonce)
    {
        senderNonce = nonce;

        return this;
    }

    public PKIHeaderBuilder setRecipNonce(byte[] nonce)
    {
        return setRecipNonce(nonce == null ? null : new DEROctetString(nonce));
    }

    public PKIHeaderBuilder setRecipNonce(ASN1OctetString nonce)
    {
        recipNonce = nonce;

        return this;
    }

    public PKIHeaderBuilder setFreeText(PKIFreeText text)
    {
        freeText = text;

        return this;
    }

    public PKIHeaderBuilder setGeneralInfo(InfoTypeAndValue genInfo)
    {
        return setGeneralInfo(makeGeneralInfoSeq(genInfo));
    }

    public PKIHeaderBuilder setGeneralInfo(InfoTypeAndValue[] genInfos)
    {
        return setGeneralInfo(makeGeneralInfoSeq(genInfos));
    }

    public PKIHeaderBuilder setGeneralInfo(ASN1Sequence seqOfInfoTypeAndValue)
    {
        generalInfo = seqOfInfoTypeAndValue;

        return this;
    }

    private static ASN1Sequence makeGeneralInfoSeq(
        InfoTypeAndValue generalInfo)
    {
        return new DERSequence(generalInfo);
    }

    private static ASN1Sequence makeGeneralInfoSeq(
        InfoTypeAndValue[] generalInfos)
    {
        ASN1Sequence genInfoSeq = null;
        if (generalInfos != null)
        {
            ASN1EncodableVector v = new ASN1EncodableVector();
            for (int i = 0; i < generalInfos.length; i++)
            {
                v.add(generalInfos[i]);
            }
            genInfoSeq = new DERSequence(v);
        }
        return genInfoSeq;
    }

    /**
     *      *  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 PKIHeader build()
    {
        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);

        messageTime = null;
        protectionAlg = null;
        senderKID = null;
        recipKID = null;
        transactionID = null;
        senderNonce = null;
        recipNonce = null;
        freeText = null;
        generalInfo = null;
        
        return PKIHeader.getInstance(new DERSequence(v));
    }

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