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DotNetBrightener.TimeBasedOtp 2026.0.2

Time Based OTP Library

Copyright © 2017 - 2026 Vampire Coder (formerly DotnetBrightener)

Installation

Run this in command line:

dotnet add package DotNetBrightener.TimeBasedOtp

Or add the following to .csproj file

<PackageReference Include="DotNetBrightener.TimeBasedOtp" Version="2022.10.0" />

You should check the latest version from Nuget Site

Usage

Register service

serviceCollection.AddOtpProvider();

In your service / controller:

// inject the service
IOTPProvider otpProvider; 

// generate a secret
var secret = "<some random string>";

// define the length of the password to generate
var passwordLength = 6;

// indicates whether the secret's spaces matter or not.
var ignoreSpaces = false; // false: Spaces matter. true: Spaces don't matter

var otp = otpProvider.GetPassword(secret, passwordLength, ignoreSpaces);

// the adjacent intervals to check for the OTP. The greater this value is, the higher risk of being hijacked.
var checkAdjacentIntervals = 2;

var isOtpValid = otpProvider.ValidateOTP(otp, secret, ignoreSpaces, checkAdjacentIntervals;

Note

The secret should be stored securely within your application.