PHP

Google Authenticator Algorithm

See more Encryption Examples

Example code implementing the Google Authenticator algorithm. Chilkat2 PHP

<?php

use Chilkat2\Crypt2;

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// Generating TOTP Base32 Secret:
// When you enable 2FA with a TOTP-based authenticator app, Google will provide you with a QR code
// that you can scan using the app. This QR code contains a TOTP base32 secret.
// You can also choose to view and copy the secret manually.

$secretBase32 = 'JBSWY3DPEHPK3PXP';

// Do the following to calculate the 6-digit decimal Google authenticator token for a base32 secret,
// given the current system date/time.
$crypt = new Crypt2();
$otp = $crypt->Totp($secretBase32, 'base32', '0', '', 30, 6, -1, 'sha1');

echo '6-digit decimal token = ', $otp, "\n";