TOTP library for Go
Alternatives To Otp
Project NameStarsDownloadsRepos Using ThisPackages Using ThisMost Recent CommitTotal ReleasesLatest ReleaseOpen IssuesLicenseLanguage
Glauth2,08332 days ago25July 03, 202356mitGo
A lightweight LDAP server for development, home use, or CI
Otp1,8733401,07415 days ago7December 13, 20225apache-2.0Go
TOTP library for Go
Google Authenticator Libpam1,584
11 days ago1March 03, 202160apache-2.0C
Rotp1,5242,52763a month ago38December 13, 20223mitRuby
Ruby One Time Password library
Freeotp Android1,210
7 days ago121apache-2.0Java
Otphp1,13996392 months ago52November 11, 20222mitPHP
:closed_lock_with_key: A PHP library for generating one time passwords according to RFC 4226 (HOTP) and the RFC 6238 (TOTP)
Guac Install859
a month ago45Shell
Script for installing Guacamole on Ubuntu
3 years ago34March 12, 20214gpl-3.0Go
A manager for your secrets.
Otpauth66411214 days ago89November 10, 20221mitJavaScript
One Time Password (HOTP/TOTP) library for Node.js, Deno, Bun and browsers.
Notp662169654 months ago5October 14, 201422mitJavaScript
Node One Time Password library, supports HOTP, TOTP and works with Google Authenticator
Alternatives To Otp
Select To Compare

Alternative Project Comparisons

otp: One Time Password utilities Go / Golang

PkgGoDev Build Status

Why One Time Passwords?

One Time Passwords (OTPs) are an mechanism to improve security over passwords alone. When a Time-based OTP (TOTP) is stored on a user's phone, and combined with something the user knows (Password), you have an easy on-ramp to Multi-factor authentication without adding a dependency on a SMS provider. This Password and TOTP combination is used by many popular websites including Google, GitHub, Facebook, Salesforce and many others.

The otp library enables you to easily add TOTPs to your own application, increasing your user's security against mass-password breaches and malware.

Because TOTP is standardized and widely deployed, there are many mobile clients and software implementations.

otp Supports:

  • Generating QR Code images for easy user enrollment.
  • Time-based One-time Password Algorithm (TOTP) (RFC 6238): Time based OTP, the most commonly used method.
  • HMAC-based One-time Password Algorithm (HOTP) (RFC 4226): Counter based OTP, which TOTP is based upon.
  • Generation and Validation of codes for either algorithm.

Implementing TOTP in your application:

User Enrollment

For an example of a working enrollment work flow, GitHub has documented theirs, but the basics are:

  1. Generate new TOTP Key for a User. key,_ := totp.Generate(...).
  2. Display the Key's Secret and QR-Code for the User. key.Secret() and key.Image(...).
  3. Test that the user can successfully use their TOTP. totp.Validate(...).
  4. Store TOTP Secret for the User in your backend. key.Secret()
  5. Provide the user with "recovery codes". (See Recovery Codes bellow)

Code Generation

  • In either TOTP or HOTP cases, use the GenerateCode function and a counter or time.Time struct to generate a valid code compatible with most implementations.
  • For uncommon or custom settings, or to catch unlikely errors, use GenerateCodeCustom in either module.


  1. Prompt and validate User's password as normal.
  2. If the user has TOTP enabled, prompt for TOTP passcode.
  3. Retrieve the User's TOTP Secret from your backend.
  4. Validate the user's passcode. totp.Validate(...)

Recovery Codes

When a user loses access to their TOTP device, they would no longer have access to their account. Because TOTPs are often configured on mobile devices that can be lost, stolen or damaged, this is a common problem. For this reason many providers give their users "backup codes" or "recovery codes". These are a set of one time use codes that can be used instead of the TOTP. These can simply be randomly generated strings that you store in your backend. Github's documentation provides an overview of the user experience.

Improvements, bugs, adding feature, etc:

Please open issues in Github for ideas, bugs, and general thoughts. Pull requests are of course preferred :)


otp is licensed under the Apache License, Version 2.0

Popular Totp Projects
Popular Password Projects
Popular Security Categories
Related Searches

Get A Weekly Email With Trending Projects For These Categories
No Spam. Unsubscribe easily at any time.