CodeLogic.TwoFactorAuth 4.6.72

This package has a SemVer 2.0.0 package version: 4.6.72+5b7568e.

dotnet add package CodeLogic.TwoFactorAuth --version 4.6.72

NuGet\Install-Package CodeLogic.TwoFactorAuth -Version 4.6.72

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="4.6.72" />

For projects that support PackageReference, copy this XML node into the project file to reference the package.

<PackageVersion Include="CodeLogic.TwoFactorAuth" Version="4.6.72" />
                    

                            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 4.6.72

The NuGet Team does not provide support for this client. Please contact its maintainers for support.

#r "nuget: CodeLogic.TwoFactorAuth, 4.6.72"

#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@4.6.72

#: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=4.6.72
                    

                            Install as a Cake Addin

#tool nuget:?package=CodeLogic.TwoFactorAuth&version=4.6.72
                    

                            Install as a Cake Tool

The NuGet Team does not provide support for this client. Please contact its maintainers for support.

CodeLogic.TwoFactorAuth

TOTP two-factor authentication with QR-code generation for CodeLogic 4 — compatible with Google Authenticator, Authy, and 1Password.

Implements RFC 6238 time-based one-time passwords over Otp.NET and renders provisioning QR codes with QRCoder. Two services are exposed: an authenticator (generate/validate codes) and a QR-code generator.

Install

dotnet add package CodeLogic.TwoFactorAuth

Quick start

await Libraries.LoadAsync<TwoFactorAuthLibrary>();
await CodeLogic.ConfigureAsync();
await CodeLogic.StartAsync();

var tfa = Libraries.Get<TwoFactorAuthLibrary>();

// 1. Enrol: create a key bound to issuer + user (fresh Base32 secret)
TwoFactorKey key = tfa.GenerateNewKey("MyApp", "user@example.com");
//    persist key.SecretKey alongside the user record

// 2. Show a QR code for the authenticator app
Result<string> qr = tfa.GenerateQrCodeDataUri(key);   // data:image/png;base64,...
if (qr.IsSuccess) { /* <img src="qr.Value"> */ }

// 3. Verify a code the user typed
TotpValidationResult check = tfa.ValidateTotp("123456", key.SecretKey);
if (check.IsValid) { /* grant access */ }

Features

Secret generation — cryptographically random Base32 TOTP secrets (GenerateSecretKey).
Provisioning — GenerateNewKey(issuer, user) returns a TwoFactorKey with a standard otpauth:// ProvisioningUri.
Generate & validate — GenerateTotpCode / ValidateTotp with a configurable time step and drift window; validation returns a TotpValidationResult including the matched window offset.
Lifetime helpers — GetSecondsUntilExpiry() and GetCurrentTimeWindow().
QR rendering — PNG / BMP bytes, Base64, data URI, and save-to-file, with configurable module size and error-correction level.
Events — SecretKeyGeneratedEvent and TotpValidatedEvent on the CodeLogic event bus.

Configuration

Auto-generated on first run as config.twofactorauth.json:

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

Setting	Default	Description
`Enabled`	`true`	Master switch; when `false` the services aren't created and health reports disabled.
`TimeStepSeconds`	`30`	TOTP time step (1–300); must match the authenticator app.
`WindowSize`	`1`	Steps before/after the current window accepted (0–10); `1` ≈ ±30s drift.
`QrCodeModuleSize`	`20`	Pixel size of each QR module (1–100).
`ErrorCorrectionLevel`	`Q`	`L` (~7%), `M` (~15%), `Q` (~25%), `H` (~30%).

Documentation

Full guide: CL.TwoFactorAuth documentation

Requirements

CodeLogic 4 · .NET 10
Otp.NET 1.x · QRCoder 1.x

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.

net10.0
- CodeLogic (>= 4.0.0 && < 5.0.0)
- Otp.NET (>= 1.4.1)
- QRCoder (>= 1.8.0)

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
4.6.72	177	6/20/2026
4.6.69-preview	35	6/20/2026
4.5.2	105	5/24/2026
4.5.2-preview.68	56	6/20/2026
4.5.1	156	5/24/2026
4.5.1-preview.56	97	5/24/2026
4.4.2-preview.53	56	5/24/2026
4.4.1	101	5/24/2026
4.0.5	106	5/15/2026
4.0.4	111	5/9/2026
4.0.3	109	5/9/2026
3.3.1	624	4/18/2026
3.3.0	114	4/18/2026
3.2.11	125	4/18/2026
3.2.10	113	4/18/2026
3.2.9	108	4/18/2026
3.2.8	107	4/18/2026
3.2.7	107	4/18/2026
3.2.6	107	4/18/2026
3.2.5	114	4/18/2026

# CL.TwoFactorAuth — Changelog

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

## 2026-06-20

### Documentation

- Full rewrite of the README and the `docs/libs/twofactorauth.md` guide to the
shared house style: a concise, NuGet-rendered README (badges, tagline, install,
quick start, features, configuration table + JSON, requirements) and a single
deep documentation page covering the enrolment flow, sign-in validation, the
`Authenticator` and `QrCode` services, the `TwoFactorKey` /
`TotpValidationResult` shapes, configuration, events, and the health check.
No API changes.

## [4.5.2] — 2026-06-20

### Documentation

- Corrected the README and the security guide to match the shipping API. The
previous docs referenced members and config keys that do not exist
(`GenerateSecret`, `Validate(secret, token)`, `GetOtpAuthUri`, backup-code
helpers, and the `Issuer`/`SecretKeyLength`/`TokenValiditySeconds`/
`AllowedClockSkewSeconds`/`QrCodeSize` settings).
- Documented the real configuration keys: `Enabled`, `TimeStepSeconds`,
`WindowSize`, `QrCodeModuleSize`, and `ErrorCorrectionLevel`
(`L`/`M`/`Q`/`H`).
- Documented the `Authenticator` and `QrCode` services and their full surface:
`GenerateSecretKey`, `GenerateNewKey`, `GenerateTotpCode`, `ValidateTotp`
(incl. the optional `userId` argument and the `TotpValidationResult` shape),
`GetSecondsUntilExpiry`, `GetCurrentTimeWindow`, and the QR outputs
`GenerateQrCodePng` / `GenerateQrCodeBmp` / `GenerateQrCodeBase64` /
`GenerateQrCodeDataUri` / `SaveQrCodeToFile`.
- Documented the `TwoFactorKey.ProvisioningUri` (`otpauth://`) property, the
`SecretKeyGeneratedEvent` / `TotpValidatedEvent` bus events, and the actual
health-check behavior (live TOTP key generation).

## [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).