A serverless web application that generates TOTP and HOTP codes, enabling robust two-factor authentication (2FA) directly within your browser. Powered by Nuxt 3, NuxtHub, Cloudflare Pages, D1 Database, and Drizzle ORM.

HMAC Based One Time Passwords in PHP. RFC4226 and RFC6238 compliant.

HOTP/TOTP one time passwords on java phones (J2ME)

HOTP and TOTP algorithms in Erlang.

Nextcloud app that allows you to manage your OTP (TOTP/HOTP) codes easily

Nextcloud app that allows you to manage your OTP (TOTP/HOTP) codes easily

Go library for one-time passwords, supports HOPT and TOPT (Google Authenticator compatible)

Online One Time Password (HOTP/TOTP) generator.

Similar to the Google authenticator just written in Python to automate annoying two factor authentication.

A simple, easy-to-use one-time password generator implementation for .NET Core 3.1. Compatible with Google Authenticator.

Cross-platform console C#/.Net implementation to generate one time passwords (TOTP/HOTP) for open authentication defined by standard RFC's (4226, 6238). Compatible with Google/Microsoft Authenticator apps.

This Go package provides implementations for One-Time Password (OTP) systems, including TOTP (Time-Based One-Time Password), HOTP (HMAC-Based One-Time Password), and OCRA (OATH Challenge-Response Algorithm). It offers a secure, flexible, and easy-to-use solution for enhancing user authentication.

A Swift library that provides cryptographic authentication algorithms like OCRA, HOTP etc.

HMAC-based one-time password generator. https://www.nuget.org/packages/sim756.HOTP

Kotlin Multiplatform library for OTP and TOTP password generation/validation

Implementation of HOTP and TOTP as per the RFC RFC4226 and RFC6238 respectively

Authenticator app with Python.

I tried to create my own HOTP generator and confirmatory with .NET 6.

Generate password for any site, with only a master password, a site name, a login and a counter using Lesspass algorithm. Generate TOTP or HOTP too.