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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 java.io.IOException;
import java.math.BigInteger;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.cms.ContentInfo;
import org.bouncycastle.asn1.dvcs.DVCSObjectIdentifiers;
import org.bouncycastle.asn1.dvcs.DVCSRequestInformationBuilder;
import org.bouncycastle.asn1.dvcs.Data;
import org.bouncycastle.asn1.x509.ExtensionsGenerator;
import org.bouncycastle.asn1.x509.GeneralName;
import org.bouncycastle.asn1.x509.GeneralNames;
import org.bouncycastle.cms.CMSSignedDataGenerator;

/**
 * Common base class for client DVCRequest builders.
 * This class aims at DVCSRequestInformation and TransactionIdentifier construction,
 * and its subclasses - for Data field construction (as it is specific for the requested service).
 */
public abstract class DVCSRequestBuilder
{
    private final ExtensionsGenerator extGenerator = new ExtensionsGenerator();
    private final CMSSignedDataGenerator signedDataGen = new CMSSignedDataGenerator();

    protected final DVCSRequestInformationBuilder requestInformationBuilder;

    protected DVCSRequestBuilder(DVCSRequestInformationBuilder requestInformationBuilder)
    {
        this.requestInformationBuilder = requestInformationBuilder;
    }

    /**
     * Set a nonce for this request,
     *
     * @param nonce
     */
    public void setNonce(BigInteger nonce)
    {
        requestInformationBuilder.setNonce(nonce);
    }

    /**
     * Set requester name.
     *
     * @param requester
     */
    public void setRequester(GeneralName requester)
    {
        requestInformationBuilder.setRequester(requester);
    }

    /**
     * Set DVCS name to generated requests.
     *
     * @param dvcs
     */
    public void setDVCS(GeneralName dvcs)
    {
        requestInformationBuilder.setDVCS(dvcs);
    }

    /**
     * Set DVCS name to generated requests.
     *
     * @param dvcs
     */
    public void setDVCS(GeneralNames dvcs)
    {
        requestInformationBuilder.setDVCS(dvcs);
    }

    /**
     * Set data location to generated requests.
     *
     * @param dataLocation
     */
    public void setDataLocations(GeneralName dataLocation)
    {
        requestInformationBuilder.setDataLocations(dataLocation);
    }

    /**
     * Set data location to generated requests.
     *
     * @param dataLocations
     */
    public void setDataLocations(GeneralNames dataLocations)
    {
        requestInformationBuilder.setDataLocations(dataLocations);
    }

    /**
     * Add a given extension field.
     *
     * @param oid the OID defining the extension type.
     * @param isCritical true if the extension is critical, false otherwise.
     * @param value the ASN.1 structure that forms the extension's value.
     * @throws DVCSException if there is an issue encoding the extension for adding.
     */
    public void addExtension(
        ASN1ObjectIdentifier oid,
        boolean isCritical,
        ASN1Encodable value)
        throws DVCSException
    {
        try
        {
            extGenerator.addExtension(oid, isCritical, value);
        }
        catch (IOException e)
        {
            throw new DVCSException("cannot encode extension: " + e.getMessage(), e);
        }
    }

    protected DVCSRequest createDVCRequest(Data data)
        throws DVCSException
    {
        if (!extGenerator.isEmpty())
        {
            requestInformationBuilder.setExtensions(extGenerator.generate());
        }

        org.bouncycastle.asn1.dvcs.DVCSRequest request = new org.bouncycastle.asn1.dvcs.DVCSRequest(requestInformationBuilder.build(), data);

        return new DVCSRequest(new ContentInfo(DVCSObjectIdentifiers.id_ct_DVCSRequestData, request));
    }
}