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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.dvcs;

import java.math.BigInteger;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.x509.Extensions;
import org.bouncycastle.asn1.x509.GeneralName;
import org.bouncycastle.asn1.x509.GeneralNames;
import org.bouncycastle.asn1.x509.PolicyInformation;
import org.bouncycastle.util.BigIntegers;

/**
 *  *     DVCSRequestInformation ::= SEQUENCE  {
 *         version                      INTEGER DEFAULT 1 ,
 *         service                      ServiceType,
 *         nonce                        Nonce OPTIONAL,
 *         requestTime                  DVCSTime OPTIONAL,
 *         requester                    [0] GeneralNames OPTIONAL,
 *         requestPolicy                [1] PolicyInformation OPTIONAL,
 *         dvcs                         [2] GeneralNames OPTIONAL,
 *         dataLocations                [3] GeneralNames OPTIONAL,
 *         extensions                   [4] IMPLICIT Extensions OPTIONAL
 *     }
 * 
 */
public class DVCSRequestInformationBuilder
{
    private int version = DEFAULT_VERSION;

    private final ServiceType service;
    private DVCSRequestInformation initialInfo;

    private BigInteger nonce;
    private DVCSTime requestTime;
    private GeneralNames requester;
    private PolicyInformation requestPolicy;
    private GeneralNames dvcs;
    private GeneralNames dataLocations;
    private Extensions extensions;

    private static final int DEFAULT_VERSION = 1;
    private static final int TAG_REQUESTER = 0;
    private static final int TAG_REQUEST_POLICY = 1;
    private static final int TAG_DVCS = 2;
    private static final int TAG_DATA_LOCATIONS = 3;
    private static final int TAG_EXTENSIONS = 4;

    public DVCSRequestInformationBuilder(ServiceType service)
    {
        this.service = service;
    }

    public DVCSRequestInformationBuilder(DVCSRequestInformation initialInfo)
    {
        this.initialInfo = initialInfo;
        this.service = initialInfo.getService();
        this.version = initialInfo.getVersion();
        this.nonce = initialInfo.getNonce();
        this.requestTime = initialInfo.getRequestTime();
        this.requestPolicy = initialInfo.getRequestPolicy();
        this.dvcs = initialInfo.getDVCS();
        this.dataLocations = initialInfo.getDataLocations();
    }

    public DVCSRequestInformation build()
    {
        ASN1EncodableVector v = new ASN1EncodableVector();

        if (version != DEFAULT_VERSION)
        {
            v.add(new ASN1Integer(version));
        }
        v.add(service);
        if (nonce != null)
        {
            v.add(new ASN1Integer(nonce));
        }
        if (requestTime != null)
        {
            v.add(requestTime);
        }

        int[] tags = new int[]{
            TAG_REQUESTER,
            TAG_REQUEST_POLICY,
            TAG_DVCS,
            TAG_DATA_LOCATIONS,
            TAG_EXTENSIONS
        };
        ASN1Encodable[] taggedObjects = new ASN1Encodable[]{
            requester,
            requestPolicy,
            dvcs,
            dataLocations,
            extensions
        };
        for (int i = 0; i < tags.length; i++)
        {
            int tag = tags[i];
            ASN1Encodable taggedObject = taggedObjects[i];
            if (taggedObject != null)
            {
                v.add(new DERTaggedObject(false, tag, taggedObject));
            }
        }

        return DVCSRequestInformation.getInstance(new DERSequence(v));
    }

    public void setVersion(int version)
    {
        if (initialInfo != null)
        {
            throw new IllegalStateException("cannot change version in existing DVCSRequestInformation");
        }

        this.version = version;
    }

    public void setNonce(BigInteger nonce)
    {
        // RFC 3029, 9.1: The DVCS MAY modify the fields
        // 'dvcs', 'requester', 'dataLocations', and 'nonce' of the ReqInfo structure

        // RFC 3029, 9.1: The only modification
        // allowed to a 'nonce' is the inclusion of a new field if it was not
        // present, or to concatenate other data to the end (right) of an
        // existing value.
        if (initialInfo != null)
        {
            if (initialInfo.getNonce() == null)
            {
                this.nonce = nonce;
            }
            else
            {
                byte[] initialBytes = initialInfo.getNonce().toByteArray();
                byte[] newBytes = BigIntegers.asUnsignedByteArray(nonce);
                byte[] nonceBytes = new byte[initialBytes.length + newBytes.length];

                System.arraycopy(initialBytes, 0, nonceBytes, 0, initialBytes.length);
                System.arraycopy(newBytes, 0, nonceBytes, initialBytes.length, newBytes.length);

                this.nonce = new BigInteger(nonceBytes);
            }
        }

        this.nonce = nonce;
    }

    public void setRequestTime(DVCSTime requestTime)
    {
        if (initialInfo != null)
        {
            throw new IllegalStateException("cannot change request time in existing DVCSRequestInformation");
        }

        this.requestTime = requestTime;
    }

    public void setRequester(GeneralName requester)
    {
        this.setRequester(new GeneralNames(requester));
    }

    public void setRequester(GeneralNames requester)
    {
        // RFC 3029, 9.1: The DVCS MAY modify the fields
        // 'dvcs', 'requester', 'dataLocations', and 'nonce' of the ReqInfo structure

        this.requester = requester;
    }

    public void setRequestPolicy(PolicyInformation requestPolicy)
    {
        if (initialInfo != null)
        {
            throw new IllegalStateException("cannot change request policy in existing DVCSRequestInformation");
        }

        this.requestPolicy = requestPolicy;
    }

    public void setDVCS(GeneralName dvcs)
    {
        this.setDVCS(new GeneralNames(dvcs));
    }

    public void setDVCS(GeneralNames dvcs)
    {
        // RFC 3029, 9.1: The DVCS MAY modify the fields
        // 'dvcs', 'requester', 'dataLocations', and 'nonce' of the ReqInfo structure

        this.dvcs = dvcs;
    }

    public void setDataLocations(GeneralName dataLocation)
    {
        this.setDataLocations(new GeneralNames(dataLocation));
    }

    public void setDataLocations(GeneralNames dataLocations)
    {
        // RFC 3029, 9.1: The DVCS MAY modify the fields
        // 'dvcs', 'requester', 'dataLocations', and 'nonce' of the ReqInfo structure

        this.dataLocations = dataLocations;
    }

    public void setExtensions(Extensions extensions)
    {
        if (initialInfo != null)
        {
            throw new IllegalStateException("cannot change extensions in existing DVCSRequestInformation");
        }

        this.extensions = extensions;
    }
}