TOTP / HOTP library in PHP

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

This library is compatible with Google Authenticator apps available for Android and iPhone. It is also compatible with other applications such as FreeOTP for example.

The Release Process

The release process is described here.

Prerequisites

This library needs at least PHP 5.6. It has been successfully tested using PHP 5.6, PHP 7 and HHVM

Installation

The preferred way to install this library is to rely on Composer:

composer require "spomky-labs/otphp" "~6.0.0"

TOTP or HOTP?

This library provides both TOTP and HOTP.

TOTP is a time based one-time password. It lives only during few seconds (the interval). You just have to be sure that the clock of your server and your device are synchronized. This is the most common OTP.

HOTP is a counter based one-time password. Every time a password is used, the counter is updated. You have to verify that the server and the device are synchronized.

How to use

To create a new TOTP or HOTP, just instantiate the class you selected:

use OTPHP\TOTP;

$totp = new TOTP();

or

use OTPHP\HOTP;

$hotp = new HOTP();

Have a look at How to use to initialize and generate your first OTP.

Contributing

Requests for new features, bug fixed and all other ideas to make this library useful are welcome. Please follow these best practices.

Licence

This software is release under MIT licence.