This is compatible with Google Authenticator apps available for Android and iPhone, and now in use on GMail
This is a port of the rotp ruby library available at https://github.com/mdp/rotp
clone this repository and include lib/otphp.php in your project.
$totp = new \OTPHP\TOTP("base32secret3232"); $totp->now(); // => 492039 // OTP verified for current time $totp->verify(492039); // => true //30s later $totp->verify(492039); // => false
$hotp = new \OTPHP\HOTP("base32secretkey3232"); $hotp->at(0); // => 260182 $hotp->at(1); // => 55283 $hotp->at(1401); // => 316439 // OTP verified with a counter $totp->verify(316439, 1401); // => true $totp->verify(316439, 1402); // => false
The library works with the Google Authenticator iPhone and Android app, and also includes the ability to generate provisioning URI's for use with the QR Code scanner built into the app.
$totp->provisioning_uri(); // => 'otpauth://firstname.lastname@example.org?secret=JBSWY3DPEHPK3PXP' $hotp->provisioning_uri(); // => 'otpauth://email@example.com?secret=JBSWY3DPEHPK3PXP&counter=0'
This can then be rendered as a QR Code which can then be scanned and added to the users list of OTP credentials.
Scan the following barcode with your phone, using Google Authenticator
Now run the following and compare the output
<?php require_once('otphp/lib/otphp.php'); $totp = new \OTPHP\TOTP("JBSWY3DPEHPK3PXP"); echo "Current OTP: ". $totp->now();
This software is release under MIT licence.