Initial commit

LICENSE

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+Copyright (c) 2025 Woohyun Shin (sinu)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Tenta
+
+A WinForms OTP client because why not
+
+![Tenta](images/scr.png)
+
+## Features
+
+- Add from QR code, `otpauth://` URI, or manually
+- Double click to copy to clipboard
+
+## Why use Tenta?
+
+- I needed one
+- Completely offline
+- Kinda lightweight, no bullsh*t, almost-not-ugly interface
+- Proudly not encrypting anything at all (might change later)
+
+## Known Issues
+
+- Only TOTP is supported
+- Remaining Time counter is only for the first entry, entries with different period may not show up correctly
+- Many lovely flickers but that's what I get for using WinForms
+
+## Requirements
+
+- .NET 9 Desktop Runtime
+
+## License
+
+Tenta is distributed under the MIT license. See [LICENSE](LICENSE) file for more information.

Tenta.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net9.0-windows</TargetFramework>
+    <Version>0.1.0</Version>
+    <Nullable>enable</Nullable>
+    <UseWindowsForms>true</UseWindowsForms>
+    <PublishSingleFile>true</PublishSingleFile>
+    <NoWarn>$(NoWarn);WFO5001</NoWarn>
+    <SatelliteResourceLanguages>en</SatelliteResourceLanguages>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Otp.NET" Version="1.4.0" />
+    <PackageReference Include="ZXing.Net" Version="0.16.9" />
+    <PackageReference Include="ZXing.Net.Bindings.Windows.Compatibility" Version="0.16.12" />
+  </ItemGroup>
+
+</Project>

Tenta.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.12.35707.178 d17.12
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Tenta", "Tenta.csproj", "{2443A9CA-50C4-4961-B3E5-40ED2C579FA4}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{2443A9CA-50C4-4961-B3E5-40ED2C579FA4}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{2443A9CA-50C4-4961-B3E5-40ED2C579FA4}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{2443A9CA-50C4-4961-B3E5-40ED2C579FA4}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{2443A9CA-50C4-4961-B3E5-40ED2C579FA4}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

src/AddManuallyForm.cs

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+using OtpNet;
+using System;
+using System.Windows.Forms;
+
+namespace Tenta {
+    public partial class AddManuallyForm : Form {
+        public IOTPEntity? otpEntry;
+
+        public AddManuallyForm() {
+            InitializeComponent();
+        }
+
+        private void AddManuallyForm_Load(object sender, EventArgs e) {
+            cbxAlgorithm.SelectedIndex = 0;
+        }
+
+        private void btnOK_Click(object sender, EventArgs e) {
+            if (tbxUsername.Text.Trim().Length == 0 || tbxSecret.Text.Trim().Length == 0) {
+                MessageBox.Show("Username and Secret are required!", "Tenta", MessageBoxButtons.OK, MessageBoxIcon.Error);
+                return;
+            }
+
+            int digits = 6;
+            int period = 30;
+
+            try {
+                digits = int.Parse(tbxDigits.Text);
+                period = int.Parse(tbxPeriod.Text);
+            } catch (Exception) {
+                MessageBox.Show("Digits and Period must be numbers only!", "Tenta", MessageBoxButtons.OK, MessageBoxIcon.Error);
+                return;
+            }
+
+            try {
+                Base32Encoding.ToBytes(tbxSecret.Text);
+            } catch (Exception) {
+                MessageBox.Show("Given Secret is invalid!", "Tenta", MessageBoxButtons.OK, MessageBoxIcon.Error);
+                return;
+            }
+
+            var algorithm = "";
+            switch (cbxAlgorithm.SelectedIndex) {
+                case 0: algorithm = "sha1"; break;
+                case 1: algorithm = "sha256"; break;
+                case 2: algorithm = "sha512"; break;
+            }
+
+            otpEntry = new TOTPEntity(tbxUsername.Text, tbxIssuer.Text, tbxSecret.Text, algorithm, digits, period);
+            DialogResult = DialogResult.OK;
+            Close();
+        }
+    }
+}