A PHP library to generate and verify one-time passwords. It is compatible with HOTP and TOTP.
This library needs at least PHP 7.0.
You can install via composer.
$ composer require vjolenz/php-otpGeneration and verification requires a moving factor that changes on per use. You can use a login counter as moving factor.
$user = User::find(1);
$authenticator = new \vjolenz\OtpAuth\HotpAuthenticator();
$authenticator->setSecret('12345678901234567890'); // Default: null
$authenticator->setAlgorithm('SHA256'); // Default: SHA1
$authenticator->setWindowSize(3); // Default: 1
$authenticator->setPasswordLength(9); // Default: 6
$password = $authenticator->generatePassword($user->getLoginCounter());
$user->advanceLoginCounter(); $user = User::find(1);
$authenticator = new \vjolenz\OtpAuth\HotpAuthenticator();
$authenticator->setSecret('12345678901234567890'); // Default: null
$authenticator->setAlgorithm('SHA256'); // Default: SHA1
$authenticator->setWindowSize(3); // Default: 1
$authenticator->setPasswordLength(9); // Default: 6
$authenticator->verifyPassword($password, $user->getLoginCounter());Unlike HOTP generation and verification, you don't need a moving factor since the current timestamp is used for these operations
$authenticator = new \vjolenz\OtpAuth\TotpAuthenticator();
$authenticator->setSecret('12345678901234567890'); // Default: null
$authenticator->setAlgorithm('SHA256'); // Default: SHA1
$authenticator->setWindowSize(3); // Default: 1
$authenticator->setPasswordLength(9); // Default: 6
$authenticator->setInterval(60); // Default: 30
$password = $authenticator->generatePassword(); $authenticator = new \vjolenz\OtpAuth\TotpAuthenticator();
$authenticator->setSecret('12345678901234567890'); // Default: null
$authenticator->setAlgorithm('SHA256'); // Default: SHA1
$authenticator->setWindowSize(3); // Default: 1
$authenticator->setPasswordLength(9); // Default: 6
$authenticator->setInterval(60); // Default: 30
$authenticator->verifyPassword($password);The MIT License (MIT). Please see License File for more information.