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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;

/**
 * Data piece of DVCRequest for CCPD service (Certify Claim of Possession of Data).
 * It contains CCPD-specific selector interface.
 * 
 * This objects are constructed internally,
 * to build DVCS request to CCPD service use CCPDRequestBuilder.
 * 
 */
public class CCPDRequestData
    extends DVCSRequestData
{
    /**
     * Construct from corresponding ASN.1 Data structure.
     * Note, that data should have messageImprint choice,
     * otherwise DVCSConstructionException is thrown.
     *
     * @param data
     * @throws DVCSConstructionException
     */
    CCPDRequestData(Data data)
        throws DVCSConstructionException
    {
        super(data);
        initDigest();
    }

    private void initDigest()
        throws DVCSConstructionException
    {
        if (data.getMessageImprint() == null)
        {
            throw new DVCSConstructionException("DVCSRequest.data.messageImprint should be specified for CCPD service");
        }
    }

    /**
     * Get MessageImprint value
     *
     * @return the message imprint data as a MessageImprint object.
     */
    public MessageImprint getMessageImprint()
    {
        return new MessageImprint(data.getMessageImprint());
    }
}