iTextSharp.text.pdf.PdfPKCS7.GetOCSPURL C# (CSharp) Метод

        public static String GetOCSPURL(X509Certificate certificate) {
            try {
                Asn1Object obj = GetExtensionValue(certificate, X509Extensions.AuthorityInfoAccess.Id);
                if (obj == null) {
                    return null;
                }
                
                Asn1Sequence AccessDescriptions = (Asn1Sequence) obj;
                for (int i = 0; i < AccessDescriptions.Count; i++) {
                    Asn1Sequence AccessDescription = (Asn1Sequence) AccessDescriptions[i];
                    if ( AccessDescription.Count != 2 ) {
                        continue;
                    } else {
                        if ((AccessDescription[0] is DerObjectIdentifier) && ((DerObjectIdentifier)AccessDescription[0]).Id.Equals("1.3.6.1.5.5.7.48.1")) {
                            String AccessLocation =  GetStringFromGeneralName((Asn1Object)AccessDescription[1]);
                            if ( AccessLocation == null ) {
                                return "" ;
                            } else {
                                return AccessLocation ;
                            }
                        }
                    }
                }
            } catch {
            }
            return null;
        }
        

        /**
         * Gets an encoded byte array with OCSP validation. The method should not throw an exception.
         * @param checkCert to certificate to check
         * @param rootCert the parent certificate
         * @param the url to get the verification. It it's null it will be taken
         * from the check cert or from other implementation specific source
         * @return  a byte array with the validation or null if the validation could not be obtained
         */
        public virtual byte[] GetEncoded(X509Certificate checkCert, X509Certificate rootCert, String url)
        {
            try {
                if (checkCert == null || rootCert == null)
                {
                    return(null);
                }
                if (url == null)
                {
                    url = PdfPKCS7.GetOCSPURL(checkCert);
                }
                if (url == null)
                {
                    return(null);
                }
                OcspReq        request = GenerateOCSPRequest(rootCert, checkCert.SerialNumber);
                byte[]         array   = request.GetEncoded();
                HttpWebRequest con     = (HttpWebRequest)WebRequest.Create(url);
                con.ContentLength = array.Length;
                con.ContentType   = "application/ocsp-request";
                con.Accept        = "application/ocsp-response";
                con.Method        = "POST";
                Stream outp = con.GetRequestStream();
                outp.Write(array, 0, array.Length);
                outp.Close();
                HttpWebResponse response = (HttpWebResponse)con.GetResponse();
                if (response.StatusCode != HttpStatusCode.OK)
                {
                    throw new IOException(MessageLocalization.GetComposedMessage("invalid.http.response.1", (int)response.StatusCode));
                }
                Stream   inp          = response.GetResponseStream();
                OcspResp ocspResponse = new OcspResp(inp);
                inp.Close();
                response.Close();

                if (ocspResponse.Status != 0)
                {
                    throw new IOException(MessageLocalization.GetComposedMessage("invalid.status.1", ocspResponse.Status));
                }
                BasicOcspResp basicResponse = (BasicOcspResp)ocspResponse.GetResponseObject();
                if (basicResponse != null)
                {
                    SingleResp[] responses = basicResponse.Responses;
                    if (responses.Length == 1)
                    {
                        SingleResp resp   = responses[0];
                        Object     status = resp.GetCertStatus();
                        if (status == CertificateStatus.Good)
                        {
                            return(basicResponse.GetEncoded());
                        }
                        else if (status is Org.BouncyCastle.Ocsp.RevokedStatus)
                        {
                            throw new IOException(MessageLocalization.GetComposedMessage("ocsp.status.is.revoked"));
                        }
                        else
                        {
                            throw new IOException(MessageLocalization.GetComposedMessage("ocsp.status.is.unknown"));
                        }
                    }
                }
            }
            catch (Exception ex) {
                if (LOGGER.IsLogging(Level.ERROR))
                {
                    LOGGER.Error("OcspClientBouncyCastle", ex);
                }
            }
            return(null);
        }