http://www.bouncycastle.org/java.html: 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.
  • The Legion of the Bouncy Castle Inc. 
package org.bouncycastle.dvcs;

import org.bouncycastle.asn1.dvcs.DVCSRequestInformationBuilder;
import org.bouncycastle.asn1.dvcs.Data;
import org.bouncycastle.asn1.dvcs.ServiceType;


Builder of DVCSRequests to CPD service (Certify Possession of Data).

/**
 * Builder of DVCSRequests to CPD service (Certify Possession of Data).
 */
public class CPDRequestBuilder
    extends DVCSRequestBuilder
{
    public CPDRequestBuilder()
    {
        super(new DVCSRequestInformationBuilder(ServiceType.CPD));
    }

    
Build CPD request.

Params:
  • messageBytes –  - data to be certified
Throws:
Returns:a DVSCRequest based on the builder's current state and messageBytes.
/**
     * Build CPD request.
     *
     * @param messageBytes  - data to be certified
     * @return a DVSCRequest based on the builder's current state and messageBytes.
     * @throws DVCSException on a build issue.
     */
    public DVCSRequest build(byte[] messageBytes)
        throws DVCSException
    {
        Data data = new Data(messageBytes);

        return createDVCRequest(data);
    }
}