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The Bouncy Castle Java APIs for ASN.1 extension and utility APIs used to support bcpkix and bctls with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.
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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(9);

        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;
    }
}