MongoDB.Driver.Connection.Port.Auth C# (CSharp) Метод

            public void Auth(bool doAuth, string dbname, string username, string pwhash)
            {
                if (Authorized || !doAuth) return;
                var cmd = dbname + ".$cmd";
                Writer.WriteQuery(new Doc { { "getnonce", 1 } }, cmd, 1);
                dynamic reply = Receive().First();
                if (reply.ok != 1d)
                {
                  throw new MongoSecurityException("Failed getting nonce", username, dbname);
                }
                var nonce = reply.nonce;
                var key = nonce + username + pwhash;
                Writer.WriteQuery(new Doc
                      {
                        {"authenticate", 1},
                        {"user", username},
                        {"nonce", nonce},
                        {"key", BsonWriter.MD5HashString(key)}
                      }, cmd, 1);
                dynamic auth = Receive().First();
                Authorized = (auth.ok == 1d);
                if (!Authorized)
                {
                  throw new MongoSecurityException("Authentication failed or user not authorized", username, dbname);
                }
            }