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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 1.5 to JDK 1.8. Note: this package includes the NTRU encryption algorithms.
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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;
    }
}