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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.cert.ocsp;

import java.io.IOException;

import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.ocsp.OCSPObjectIdentifiers;
import org.bouncycastle.asn1.ocsp.OCSPResponse;
import org.bouncycastle.asn1.ocsp.OCSPResponseStatus;
import org.bouncycastle.asn1.ocsp.ResponseBytes;

/**
 * base generator for an OCSP response - at the moment this only supports the
 * generation of responses containing BasicOCSP responses.
 */
public class OCSPRespBuilder
{
    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 build(
        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");
    }
}