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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.dvcs.Data;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.cms.CMSSignedData;

/**
 * Data piece of DVCS request to VSD service (Verify Signed Document).
 * It contains VSD-specific selector interface.
 * Note: the request should contain CMS SignedData object as message.
 * 
 * This objects are constructed internally,
 * to build DVCS request to VSD service use VSDRequestBuilder.
 */
public class VSDRequestData
    extends DVCSRequestData
{
    private CMSSignedData doc;

    VSDRequestData(Data data)
        throws DVCSConstructionException
    {
        super(data);
        initDocument();
    }

    private void initDocument()
        throws DVCSConstructionException
    {
        if (doc == null)
        {
            if (data.getMessage() == null)
            {
                throw new DVCSConstructionException("DVCSRequest.data.message should be specified for VSD service");
            }
            try
            {
                doc = new CMSSignedData(data.getMessage().getOctets());
            }
            catch (CMSException e)
            {
                throw new DVCSConstructionException("Can't read CMS SignedData from input", e);
            }
        }
    }

    /**
     * Get contained message (data to be certified).
     *
     * @return
     */
    public byte[] getMessage()
    {
        return data.getMessage().getOctets();
    }

    /**
     * Get the CMS SignedData object represented by the encoded message.
     *
     * @return
     */
    public CMSSignedData getParsedMessage()
    {
        return doc;
    }
}