Opc.Ua.Configuration.ApplicationInstance.CheckApplicationInstanceCertificate C# (CSharp) Method

        private static bool CheckApplicationInstanceCertificate(
            ApplicationConfiguration configuration,
            X509Certificate2 certificate,
            bool silent,
            ushort minimumKeySize)
        {
            if (certificate == null)
            {
                return false;
            }

            Utils.Trace(Utils.TraceMasks.Information, "Checking application instance certificate. {0}", certificate.Subject);

            // validate certificate.
            configuration.CertificateValidator.Validate(certificate);

            // check key size.
            if (minimumKeySize > certificate.PublicKey.Key.KeySize)
            {
                bool valid = false;

                string message = Utils.Format(
                    "The key size ({0}) in the certificate is less than the minimum provided ({1}). Update certificate?",
                    certificate.PublicKey.Key.KeySize,
                    minimumKeySize);

                if (!silent)
                {
                    if (MessageBox.Show(message, configuration.ApplicationName, MessageBoxButtons.YesNo, MessageBoxIcon.Warning) != DialogResult.Yes)
                    {
                        valid = true;
                    }
                }

                Utils.Trace(message);

                if (!valid)
                {
                    return false;
                }
            }

            // check domains.
            if (configuration.ApplicationType != ApplicationType.Client)
            {
                if (!CheckDomainsInCertificate(configuration, certificate, silent))
                {
                    return false;
                }
            }

            // update uri.
            string applicationUri = Utils.GetApplicationUriFromCertficate(certificate);

            if (String.IsNullOrEmpty(applicationUri))
            {
                bool valid = false;

                string message = "The Application URI is not specified in the certificate. Update certificate?";

                if (!silent)
                {
                    if (MessageBox.Show(message, configuration.ApplicationName, MessageBoxButtons.YesNo, MessageBoxIcon.Warning) != DialogResult.Yes)
                    {
                        valid = true;
                    }
                }

                Utils.Trace(message);

                if (!valid)
                {
                    return false;
                }
            }
            
            // update configuration.
            configuration.ApplicationUri = applicationUri;
            configuration.SecurityConfiguration.ApplicationCertificate.Certificate = certificate;

            return true;
        }

        static void Main()
        {
            // Initialize the user interface.
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);

            ApplicationInstance application = new ApplicationInstance();
            application.ApplicationType   = ApplicationType.Client;
            application.ConfigSectionName = "TutorialClient";

            try
            {
                // process and command line arguments.
                if (application.ProcessCommandLine())
                {
                    return;
                }
                
                // load the application configuration.
                application.LoadApplicationConfiguration(false);

                // check the application certificate.
                application.CheckApplicationInstanceCertificate(false, 0);

                // run the application interactively.
                Application.Run(new MainForm(application.ApplicationConfiguration));
            }
            catch (Exception e)
            {
                ExceptionDlg.Show(application.ApplicationName, e);
                return;
            }
        }