🔐 A PHP library for generating one time passwords according to RFC 4226 (HOTP) and the RFC 6238 (TOTP)

Lightweight, thread-safe Java/Kotlin TOTP (time-based one-time passwords) and HOTP generator and validator for multi-factor authentication valid for both prover and verifier based on shared secret

A generator for counter- and time based authentication codes (RFC-4226/RFC-6238, Google Authenticator).

A high-performance, zero-dependency Go package for generating and validating TOTP, HOTP and OCRA one-time passwords — RFC 4226, RFC 6238 and RFC 6287 compliant.

Node.js One-Time Password

Simple but Secure Generic OTP, OCRA (RFC6287), TOTP (RFC6238) & HOTP (RFC4226) solution!

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.

[Completed] TOTP implemented with RFC2104, RFC3174, RFC4226, RFC6234, RFC6238

🔐 Zero dependencies Deno/Bun/Node/Browser TOTP and HOTP generator based on RFC 6238 and RFC 4226 🗝️

TOTP: Time-Based One-Time Password Algorithm

🔐 Tiny & lightweight RFC 4226 & RFC 6238 compliant one-time password (HOTP/TOTP) generation & validation library for Java

OTPLib Delphi Library

a HOTP library for golang

⚠️⚒️WIP⚒️⚠️ A truely RFC complient HOTP (https://www.rfc-editor.org/rfc/rfc4226) and TOTP (https://www.rfc-editor.org/rfc/) implementation which can be used on the server and client.

Securely manage TOTPs locally in your terminal

!!UNMAINTAINED!! A truely RFC complient HOTP (https://www.rfc-editor.org/rfc/rfc4226) and TOTP (https://www.rfc-editor.org/rfc/rfc6238) implementation which can be used on the server and client.

OTPLib OTP Library

A powerful, privacy-focused web-based tool for generating and testing TOTP (Time-based One-Time Password) and HOTP (HMAC-based One-Time Password) codes. Designed for developers, security professionals, and anyone who needs to test authenticator app implementations without compromising their sensitive credentials.

lightweight, cross-platform implementation of TOTP and HOTP in C, designed for embedded systems, desktop, and server applications.

A lightweight, zero-dependency Node.js library for generating and verifying Time-Based One-Time Passwords (TOTP) and HMAC-Based One-Time Passwords (HOTP), compliant with RFC 6238 and RFC 4226.