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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.dvcs;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.cms.ContentInfo;
import org.bouncycastle.asn1.cms.SignedData;
import org.bouncycastle.asn1.dvcs.DVCSObjectIdentifiers;
import org.bouncycastle.asn1.dvcs.ServiceType;
import org.bouncycastle.asn1.x509.GeneralName;
import org.bouncycastle.cms.CMSSignedData;

/**
 * DVCRequest is general request to DVCS (RFC 3029).
 * It represents requests for all types of services.
 * Requests for different services differ in DVCData structure.
 */
public class DVCSRequest
    extends DVCSMessage
{
    private org.bouncycastle.asn1.dvcs.DVCSRequest asn1;
    private DVCSRequestInfo reqInfo;
    private DVCSRequestData data;

    /**
     * Constructs DVCRequest from CMS SignedData object.
     *
     * @param signedData the CMS SignedData object containing the request
     * @throws DVCSConstructionException
     */
    public DVCSRequest(CMSSignedData signedData)
        throws DVCSConstructionException
    {
        this(SignedData.getInstance(signedData.toASN1Structure().getContent()).getEncapContentInfo());
    }

    /**
     * Construct a DVCS Request from a ContentInfo
     *
     * @param contentInfo the contentInfo representing the DVCSRequest
     * @throws DVCSConstructionException
     */
    public DVCSRequest(ContentInfo contentInfo)
        throws DVCSConstructionException
    {
        super(contentInfo);

        if (!DVCSObjectIdentifiers.id_ct_DVCSRequestData.equals(contentInfo.getContentType()))
        {
            throw new DVCSConstructionException("ContentInfo not a DVCS Request");
        }

        try
        {
            if (contentInfo.getContent().toASN1Primitive() instanceof ASN1Sequence)
            {
                this.asn1 = org.bouncycastle.asn1.dvcs.DVCSRequest.getInstance(contentInfo.getContent());
            }
            else
            {
                this.asn1 = org.bouncycastle.asn1.dvcs.DVCSRequest.getInstance(ASN1OctetString.getInstance(contentInfo.getContent()).getOctets());
            }
        }
        catch (Exception e)
        {
            throw new DVCSConstructionException("Unable to parse content: " + e.getMessage(), e);
        }

        this.reqInfo = new DVCSRequestInfo(asn1.getRequestInformation());

        int service = reqInfo.getServiceType();
        if (service == ServiceType.CPD.getValue().intValue())
        {
            this.data = new CPDRequestData(asn1.getData());
        }
        else if (service == ServiceType.VSD.getValue().intValue())
        {
            this.data = new VSDRequestData(asn1.getData());
        }
        else if (service == ServiceType.VPKC.getValue().intValue())
        {
            this.data = new VPKCRequestData(asn1.getData());
        }
        else if (service == ServiceType.CCPD.getValue().intValue())
        {
            this.data = new CCPDRequestData(asn1.getData());
        }
        else
        {
            throw new DVCSConstructionException("Unknown service type: " + service);
        }
    }

    /**
     * Return the ASN.1 DVCSRequest structure making up the body of this request.
     *
     * @return an org.bouncycastle.asn1.dvcs.DVCSRequest object.
     */
    public ASN1Encodable getContent()
    {
        return asn1;
    }

    /**
     * Get RequestInformation envelope.
     *
     * @return the request info object.
     */
    public DVCSRequestInfo getRequestInfo()
    {
        return reqInfo;
    }

    /**
     * Get data of DVCRequest.
     * Depending on type of the request it could be different subclasses of DVCRequestData.
     *
     * @return the request Data object.
     */
    public DVCSRequestData getData()
    {
        return data;
    }

    /**
     * Get the transaction identifier of request.
     *
     * @return the GeneralName representing the Transaction Identifier.
     */
    public GeneralName getTransactionIdentifier()
    {
        return asn1.getTransactionIdentifier();
    }
}