iTextSharp.text.pdf.security.OcspVerifier.IsValidResponse C# (CSharp) Method

        public void IsValidResponse(BasicOcspResp ocspResp, X509Certificate issuerCert)
        {
            // by default the OCSP responder certificate is the issuer certificate
            X509Certificate responderCert = issuerCert;
            // check if there's a responder certificate
            X509Certificate[] certs = ocspResp.GetCerts();
            if (certs.Length > 0) {
                responderCert = certs[0];
                try {
                    responderCert.Verify(issuerCert.GetPublicKey());
                }
                catch (GeneralSecurityException) {
                    if (base.Verify(responderCert, issuerCert, DateTime.MaxValue).Count == 0)
                        throw new VerificationException(responderCert, String.Format("{0} Responder certificate couldn't be verified", responderCert));
                }
            }
            // verify if the signature of the response is valid
            if (!VerifyResponse(ocspResp, responderCert))
                throw new VerificationException(responderCert, String.Format("{0} OCSP response could not be verified", responderCert));
        }

 /**
  * Gets OCSP response. If {@see OCSPVerifier} was set, the response will be checked.
  */
 public virtual BasicOcspResp GetBasicOCSPResp(X509Certificate checkCert, X509Certificate rootCert, String url)
 {
     try {
         OcspResp ocspResponse = GetOcspResponse(checkCert, rootCert, url);
         if (ocspResponse == null)
         {
             return(null);
         }
         if (ocspResponse.Status != OcspRespStatus.Successful)
         {
             return(null);
         }
         BasicOcspResp basicResponse = (BasicOcspResp)ocspResponse.GetResponseObject();
         if (verifier != null)
         {
             verifier.IsValidResponse(basicResponse, rootCert);
         }
         return(basicResponse);
     } catch (Exception ex) {
         if (LOGGER.IsLogging(Level.ERROR))
         {
             LOGGER.Error(ex.Message);
         }
     }
     return(null);
 }