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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.ASN1GeneralizedTime;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.x509.Extensions;
import org.bouncycastle.asn1.x509.GeneralNames;
import org.bouncycastle.asn1.x509.PolicyInformation;

/**
 *  *     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 DVCSRequestInformation
    extends ASN1Object
{
    private int version = DEFAULT_VERSION;
    private ServiceType service;
    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;

    private DVCSRequestInformation(ASN1Sequence seq)
    {
        int i = 0;

        if (seq.getObjectAt(0) instanceof ASN1Integer)
        {
            ASN1Integer encVersion = ASN1Integer.getInstance(seq.getObjectAt(i++));
            this.version = encVersion.intValueExact();
        }
        else
        {
            this.version = 1;
        }

        this.service = ServiceType.getInstance(seq.getObjectAt(i++));

        while (i < seq.size())
        {
            ASN1Encodable x = seq.getObjectAt(i);

            if (x instanceof ASN1Integer)
            {
                this.nonce = ASN1Integer.getInstance(x).getValue();
            }
            else if (x instanceof ASN1GeneralizedTime)
            {
                this.requestTime = DVCSTime.getInstance(x);
            }
            else if (x instanceof ASN1TaggedObject)
            {
                ASN1TaggedObject t = ASN1TaggedObject.getInstance(x);
                int tagNo = t.getTagNo();

                switch (tagNo)
                {
                case TAG_REQUESTER:
                    this.requester = GeneralNames.getInstance(t, false);
                    break;
                case TAG_REQUEST_POLICY:
                    this.requestPolicy = PolicyInformation.getInstance(ASN1Sequence.getInstance(t, false));
                    break;
                case TAG_DVCS:
                    this.dvcs = GeneralNames.getInstance(t, false);
                    break;
                case TAG_DATA_LOCATIONS:
                    this.dataLocations = GeneralNames.getInstance(t, false);
                    break;
                case TAG_EXTENSIONS:
                    this.extensions = Extensions.getInstance(t, false);
                    break;
                default:
                    throw new IllegalArgumentException("unknown tag number encountered: " + tagNo);
                }
            }
            else
            {
                this.requestTime = DVCSTime.getInstance(x);
            }

            i++;
        }
    }

    public static DVCSRequestInformation getInstance(Object obj)
    {
        if (obj instanceof DVCSRequestInformation)
        {
            return (DVCSRequestInformation)obj;
        }
        else if (obj != null)
        {
            return new DVCSRequestInformation(ASN1Sequence.getInstance(obj));
        }

        return null;
    }

    public static DVCSRequestInformation getInstance(
        ASN1TaggedObject obj,
        boolean explicit)
    {
        return getInstance(ASN1Sequence.getInstance(obj, explicit));
    }

    public ASN1Primitive toASN1Primitive()
    {
        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 new DERSequence(v);
    }

    public String toString()
    {

        StringBuffer s = new StringBuffer();

        s.append("DVCSRequestInformation {\n");

        if (version != DEFAULT_VERSION)
        {
            s.append("version: " + version + "\n");
        }
        s.append("service: " + service + "\n");
        if (nonce != null)
        {
            s.append("nonce: " + nonce + "\n");
        }
        if (requestTime != null)
        {
            s.append("requestTime: " + requestTime + "\n");
        }
        if (requester != null)
        {
            s.append("requester: " + requester + "\n");
        }
        if (requestPolicy != null)
        {
            s.append("requestPolicy: " + requestPolicy + "\n");
        }
        if (dvcs != null)
        {
            s.append("dvcs: " + dvcs + "\n");
        }
        if (dataLocations != null)
        {
            s.append("dataLocations: " + dataLocations + "\n");
        }
        if (extensions != null)
        {
            s.append("extensions: " + extensions + "\n");
        }

        s.append("}\n");
        return s.toString();
    }

    public int getVersion()
    {
        return version;
    }

    public ServiceType getService()
    {
        return service;
    }

    public BigInteger getNonce()
    {
        return nonce;
    }

    public DVCSTime getRequestTime()
    {
        return requestTime;
    }

    public GeneralNames getRequester()
    {
        return requester;
    }

    public PolicyInformation getRequestPolicy()
    {
        return requestPolicy;
    }

    public GeneralNames getDVCS()
    {
        return dvcs;
    }

    public GeneralNames getDataLocations()
    {
        return dataLocations;
    }

    public Extensions getExtensions()
    {
        return extensions;
    }
}