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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 1.8 and up. 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;

/**
 * Data piece of DVCRequest for CPD service (Certify Possession of Data).
 * It contains CPD-specific selector interface.
 * 
 * This objects are constructed internally,
 * to build DVCS request to CPD service use CPDRequestBuilder.
 * 
 */
public class CPDRequestData
    extends DVCSRequestData
{
    CPDRequestData(Data data)
        throws DVCSConstructionException
    {
        super(data);
        initMessage();
    }

    private void initMessage()
        throws DVCSConstructionException
    {
        if (data.getMessage() == null)
        {
            throw new DVCSConstructionException("DVCSRequest.data.message should be specified for CPD service");
        }
    }

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