private void ApplySettingsButton_Click() { byte[] pubKey = null; byte[] privKey = null; bool privKeyChanged = privKeyInput.Text != PrivKeyHiddenBlurb; try { if (pubKeyInput.Text.Trim() != "") { pubKey = Convert.FromBase64String(pubKeyInput.Text); if (!CryptoHandler.IsKeyValid(pubKey)) { ShowToast("Invalid Public Key"); return; } } } catch (FormatException) { ShowToast("Invalid Public Key Format"); return; } try { if (privKeyChanged && privKeyInput.Text.Trim() != "") { privKey = Convert.FromBase64String(privKeyInput.Text); if (!CryptoHandler.IsKeyValid(privKey)) { ShowToast("Invalid Private Key"); return; } } } catch (FormatException) { ShowToast("Invalid Private Key Format"); return; } AppSettings.Global.TargetUrl = targetUrlSettingInput.Text; AppSettings.Global.Positions = posAvailInput.Text; AppSettings.Global.DeviceId = deviceIdInput.Text; AppSettings.Global.GroupId = groupIdInput.Text; AppSettings.Global.KioskMode = kioskModeSwitch.Checked; AppSettings.Global.PubKey = pubKey; if (privKeyChanged) { AppSettings.Global.PrivKey = privKey; } ShowToast("Settings Saved"); }