Renci.SshNet.PrivateKeyAuthenticationMethod.Authenticate C# (CSharp) Method

        public override AuthenticationResult Authenticate(Session session)
        {
            session.UserAuthenticationSuccessReceived += Session_UserAuthenticationSuccessReceived;
            session.UserAuthenticationFailureReceived += Session_UserAuthenticationFailureReceived;
            session.UserAuthenticationPublicKeyReceived += Session_UserAuthenticationPublicKeyReceived;

            session.RegisterMessage("SSH_MSG_USERAUTH_PK_OK");

            try
            {
                foreach (var keyFile in KeyFiles)
                {
                    _authenticationCompleted.Reset();
                    _isSignatureRequired = false;

                    var message = new RequestMessagePublicKey(ServiceName.Connection,
                                                              Username,
                                                              keyFile.HostKey.Name,
                                                              keyFile.HostKey.Data);

                    if (KeyFiles.Count < 2)
                    {
                        //  If only one key file provided then send signature for very first request
                        var signatureData = new SignatureData(message, session.SessionId).GetBytes();

                        message.Signature = keyFile.HostKey.Sign(signatureData);
                    }

                    //  Send public key authentication request
                    session.SendMessage(message);

                    session.WaitOnHandle(_authenticationCompleted);

                    if (_isSignatureRequired)
                    {
                        _authenticationCompleted.Reset();

                        var signatureMessage = new RequestMessagePublicKey(ServiceName.Connection,
                                                                           Username,
                                                                           keyFile.HostKey.Name,
                                                                           keyFile.HostKey.Data);

                        var signatureData = new SignatureData(message, session.SessionId).GetBytes();

                        signatureMessage.Signature = keyFile.HostKey.Sign(signatureData);

                        //  Send public key authentication request with signature
                        session.SendMessage(signatureMessage);
                    }

                    session.WaitOnHandle(_authenticationCompleted);

                    if (_authenticationResult == AuthenticationResult.Success)
                    {
                        break;
                    }
                }

                return _authenticationResult;
            }
            finally
            {
                session.UserAuthenticationSuccessReceived -= Session_UserAuthenticationSuccessReceived;
                session.UserAuthenticationFailureReceived -= Session_UserAuthenticationFailureReceived;
                session.UserAuthenticationPublicKeyReceived -= Session_UserAuthenticationPublicKeyReceived;
                session.UnRegisterMessage("SSH_MSG_USERAUTH_PK_OK");
            }
        }