iTextSharp.text.pdf.TSAClientBouncyCastle.GetTSAResponse C# (CSharp) Метод

        protected internal virtual byte[] GetTSAResponse(byte[] requestBytes) {
            HttpWebRequest con = (HttpWebRequest)WebRequest.Create(tsaURL);
            con.ContentLength = requestBytes.Length;
            con.ContentType = "application/timestamp-query";
            con.Method = "POST";
            if ((tsaUsername != null) && !tsaUsername.Equals("") ) {
                string authInfo = tsaUsername + ":" + tsaPassword;
                authInfo = Convert.ToBase64String(Encoding.Default.GetBytes(authInfo));
                con.Headers["Authorization"] = "Basic " + authInfo;
            }
            Stream outp = con.GetRequestStream();
            outp.Write(requestBytes, 0, requestBytes.Length);
            outp.Close();
            HttpWebResponse response = (HttpWebResponse)con.GetResponse();
            if (response.StatusCode != HttpStatusCode.OK)
                throw new IOException("Invalid HTTP response: " + (int)response.StatusCode);
            Stream inp = response.GetResponseStream();

            MemoryStream baos = new MemoryStream();
            byte[] buffer = new byte[1024];
            int bytesRead = 0;
            while ((bytesRead = inp.Read(buffer, 0, buffer.Length)) > 0) {
                baos.Write(buffer, 0, bytesRead);
            }
            inp.Close();
            response.Close();
            byte[] respBytes = baos.ToArray();
            
            String encoding = response.ContentEncoding;
            if (encoding != null && Util.EqualsIgnoreCase(encoding, "base64")) {
                respBytes = Convert.FromBase64String(Encoding.ASCII.GetString(respBytes));
            }
            return respBytes;
        }    
    }