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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5.

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package org.bouncycastle.ocsp;

import java.io.*;

import org.bouncycastle.asn1.*;
import org.bouncycastle.asn1.ocsp.*;

/**
 * base generator for an OCSP response - at the moment this only supports the
 * generation of responses containing BasicOCSP responses.
 */
public class OCSPRespGenerator
{
    public static final int SUCCESSFUL            = 0;  // Response has valid confirmations
    public static final int MALFORMED_REQUEST     = 1;  // Illegal confirmation request
    public static final int INTERNAL_ERROR        = 2;  // Internal error in issuer
    public static final int TRY_LATER             = 3;  // Try again later
                                                        // (4) is not used
    public static final int SIG_REQUIRED          = 5;  // Must sign the request
    public static final int UNAUTHORIZED          = 6;  // Request unauthorized

    public OCSPResp generate(
        int     status,
        Object  response)
        throws OCSPException
    {
      if (response == null)
      {
              return new OCSPResp(new OCSPResponse(new OCSPResponseStatus(status),null));
      }
        if (response instanceof BasicOCSPResp)
        {
            BasicOCSPResp   r = (BasicOCSPResp)response;
            ASN1OctetString octs;
            
            try
            {
                octs = new DEROctetString(r.getEncoded());
            }
            catch (IOException e)
            {
                throw new OCSPException("can't encode object.", e);
            }

            ResponseBytes   rb = new ResponseBytes(
                    OCSPObjectIdentifiers.id_pkix_ocsp_basic, octs);

            return new OCSPResp(new OCSPResponse(
                                    new OCSPResponseStatus(status), rb));
        }

        throw new OCSPException("unknown response object");
    }
}