GoogleAuthenticator 2.4.0

There is a newer version of this package available.
See the version list below for details.
dotnet add package GoogleAuthenticator --version 2.4.0
NuGet\Install-Package GoogleAuthenticator -Version 2.4.0
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="GoogleAuthenticator" Version="2.4.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add GoogleAuthenticator --version 2.4.0
#r "nuget: GoogleAuthenticator, 2.4.0"
#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.
// Install GoogleAuthenticator as a Cake Addin
#addin nuget:?package=GoogleAuthenticator&version=2.4.0

// Install GoogleAuthenticator as a Cake Tool
#tool nuget:?package=GoogleAuthenticator&version=2.4.0

GoogleAuthenticator

Simple, easy to use server-side two-factor authentication library for .NET that works with Google Authenticator

Build Status NuGet Status

Install-Package GoogleAuthenticator

1.x Usage

See blog post for usage instructions (1.x only):

https://csharprookie.wordpress.com/2015/03/17/implementing-free-two-factor-authentication-in-net-using-google-authenticator/

2.x Usage

Additional examples at Google.Authenticator.WinTest and Google.Authenticator.WebSample

using Google.Authenticator;

string key = Guid.NewGuid().ToString().Replace("-", "").Substring(0, 10);

TwoFactorAuthenticator tfa = new TwoFactorAuthenticator();
SetupCode setupInfo = tfa.GenerateSetupCode("Test Two Factor", "user@example.com", key, false, 3);

string qrCodeImageUrl = setupInfo.QrCodeSetupImageUrl;
string manualEntrySetupCode = setupInfo.ManualEntryKey;

imgQrCode.ImageUrl = qrCodeImageUrl;
lblManualSetupCode.Text = manualEntrySetupCode;

// verify
TwoFactorAuthenticator tfa = new TwoFactorAuthenticator();
bool result = tfa.ValidateTwoFactorPIN(key, txtCode.Text)

Common Pitfalls

  • Old documentation indicated specifying width and height for the QR code, but changes in QR generation now uses pixels per module (QR "pixel") so using a value too high will result in a huge image that can overrun memory allocations
  • Don't use the secret key and ManualEntryKey interchangeably. ManualEntryKey is used to enter into the authenticator app when scanning a QR code is impossible and is derived from the secret key (discussion example)

Notes

On linux, you need to ensure libgdiplus is installed if you want to generate QR Codes. See https://github.com/codebude/QRCoder/issues/227.

Product Compatible and additional computed target framework versions.
.NET net5.0 is compatible.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed. 
.NET Core netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 was computed. 
.NET Framework net45 is compatible.  net451 was computed.  net452 was computed.  net46 was computed.  net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages (31)

Showing the top 5 NuGet packages that depend on GoogleAuthenticator:

Package Downloads
GeeksCoreLibrary

Geeks Core Library

SenseNet.ContentRepository

Content Repository layer for the sensenet platform.

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Integration with Google MFA

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Package Description

FleekDeveloper.GoogleAuthenticator

Custom extension for Google Authenticator

GitHub repositories (7)

Showing the top 5 popular GitHub repositories that depend on GoogleAuthenticator:

Repository Stars
nopSolutions/nopCommerce
ASP.NET Core eCommerce software. nopCommerce is a free and open-source shopping cart.
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Open source, headless, multi-tenant eCommerce platform built with .NET Core, MongoDB, AWS DocumentDB, Azure CosmosDB, Vue.js.
grandnode/grandnode2
Open-Source eCommerce Platform on .NET Core, MongoDB, AWS DocumentDB, Azure CosmosDB, LiteDB & Vue.js
YAFNET/YAFNET
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Version Downloads Last updated
3.3.0-beta1 111 3/13/2024
3.2.0 58,642 1/12/2024
3.1.1 127,718 10/4/2023
3.1.1-beta1 2,834 5/30/2023
3.1.0 289,090 5/3/2023
3.0.0 1,012,923 6/1/2022
3.0.0-beta2 706 5/26/2022
3.0.0-beta1 1,102 5/6/2022
2.5.0 161,886 4/13/2022
2.4.0 183,927 12/28/2021
2.3.0 106,296 11/30/2021
2.2.0 359,262 7/13/2021
2.1.1 484,786 12/3/2020
2.0.1 409,509 1/10/2020
2.0.0 10,735 1/2/2020
1.2.1 1,265,275 12/7/2016
1.2.0 100,633 9/23/2015
1.1.0 8,686 1/7/2015
1.0.0 2,973 9/8/2014