CodeLogic.TwoFactorAuth 4.5.2

.NET 10.0 This package targets .NET 10.0. The package is compatible with this framework or higher. 
dotnet add package CodeLogic.TwoFactorAuth --version 4.5.2
                    


                    

                
NuGet\Install-Package CodeLogic.TwoFactorAuth -Version 4.5.2
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="CodeLogic.TwoFactorAuth" Version="4.5.2" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="CodeLogic.TwoFactorAuth" Version="4.5.2" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="CodeLogic.TwoFactorAuth" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add CodeLogic.TwoFactorAuth --version 4.5.2
                    


                    

                
#r "nuget: CodeLogic.TwoFactorAuth, 4.5.2"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
#:package CodeLogic.TwoFactorAuth@4.5.2
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=CodeLogic.TwoFactorAuth&version=4.5.2
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=CodeLogic.TwoFactorAuth&version=4.5.2
                    


                            Install as a Cake Tool

CodeLogic.TwoFactorAuth

NuGet

TOTP two-factor authentication with QR code generation for CodeLogic applications.

Install

dotnet add package CodeLogic.TwoFactorAuth

Quick Start

var tfaLib = new TwoFactorAuthLibrary();
// After library initialization via CodeLogic framework:

// Generate a new key for a user
var key = tfaLib.GenerateNewKey("MyApp", "user@example.com");

// Render a QR code for Google Authenticator / Authy
var qrDataUri = tfaLib.GenerateQrCodeDataUri(key);
// Use qrDataUri.Value in an <img src="..."> tag

// Validate a code entered by the user
var result = tfaLib.ValidateTotp("123456", key.Secret);
Console.WriteLine($"Valid: {result.IsValid}");

Features

  • Secret key generation — cryptographically random Base32-encoded TOTP secrets
  • TOTP validation — verify 6-digit codes with configurable time-step and drift window
  • QR code rendering — PNG, BMP, Base64, and data URI output for authenticator app provisioning
  • Google Authenticator compatible — standard otpauth:// URI format
  • Event integration — validation attempts are published to the CodeLogic event bus

Configuration

Config file: config.twofactorauth.json

{
  "Enabled": true,
  "TimeStepSeconds": 30,
  "WindowSize": 1,
  "QrCodeModuleSize": 20,
  "ErrorCorrectionLevel": "Q"
}

Documentation

Full API docs: https://github.com/Media2A/CodeLogic.Libs

Requirements

License

MIT — see LICENSE

Product Compatible and additional computed target framework versions.
.NET net10.0 is compatible.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-windows was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last Updated
4.5.2 92 5/24/2026
4.5.1 105 5/24/2026
4.5.1-preview.56 83 5/24/2026
4.4.2-preview.53 45 5/24/2026
4.4.1 88 5/24/2026
4.0.5 95 5/15/2026
4.0.4 101 5/9/2026
4.0.3 99 5/9/2026
3.3.1 612 4/18/2026
3.3.0 103 4/18/2026
3.2.11 114 4/18/2026
3.2.10 100 4/18/2026
3.2.9 96 4/18/2026
3.2.8 97 4/18/2026
3.2.7 97 4/18/2026
3.2.6 95 4/18/2026
3.2.5 101 4/18/2026
3.2.4 104 4/17/2026
3.2.3 94 4/17/2026
3.2.2 151 4/17/2026
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# CL.TwoFactorAuth — Changelog

All notable changes to **CodeLogic.TwoFactorAuth** are documented here. Versions follow
[Semantic Versioning](https://semver.org/).

## [4.5.0] — 2026-05-24

### Changed

- **Unified versioning.** All CodeLogic.Libs now share a single version line
 controlled by `version.txt` in the repo root. This is a version alignment
 release — no functional changes to this library.
## [4.0.4] — 2026-04-16

### Changed

- README + manifest refresh for the v4 baseline. No functional changes vs 4.0.3.
- `LibraryManifest.Version` now reads from assembly metadata.

## [4.0.2] — 2026-04-09

### Changed

- Annotated 2FA configuration with `[ConfigField]` for the admin UI surface.
- Aligned with the v4 baseline across all libraries.

## [4.0.0] — 2026-04-09

Major rewrite. Republished as v4.0.0 to reset the version line under the
unified v4 baseline. TOTP-based 2FA with QR code generation, backup codes,
and a CodeLogic-native flow for Google Authenticator / Authy / 1Password.

### Notes

- Earlier history is retained in the
 [git log](https://github.com/Media2A/CodeLogic.Libs/commits/main/CL.TwoFactorAuth).