<!doctype html>
<html>
<head>
<title>Demo</title>
</head>
<body>
<ol>
<?php
// in practice you would require the composer loader if it was not already part of your framework or project
spl_autoload_register(function ($className) {
include_once str_replace(array('RobThree\\Auth', '\\'), array(__DIR__.'/../lib', '/'), $className) . '.php';
});
// substitute your company or app name here
$tfa = new RobThree\Auth\TwoFactorAuth('RobThree TwoFactorAuth');
?>
<li>First create a secret and associate it with a user</li>
<?php
$secret = $tfa->createSecret();
?>
<li>
Next create a QR code and let the user scan it:<br>
<img src="<?php echo $tfa->getQRCodeImageAsDataUri('Demo', $secret); ?>"><br>
...or display the secret to the user for manual entry:
<?php echo chunk_split($secret, 4, ' '); ?>
</li>
<?php
$code = $tfa->getCode($secret);
?>
<li>Next, have the user verify the code; at this time the code displayed by a 2FA-app would be: <span style="color:#00c"><?php echo $code; ?></span> (but that changes periodically)</li>
<li>When the code checks out, 2FA can be / is enabled; store (encrypted?) secret with user and have the user verify a code each time a new session is started.</li>
<li>
When aforementioned code (<?php echo $code; ?>) was entered, the result would be:
<?php if ($tfa->verifyCode($secret, $code) === true) { ?>
<span style="color:#0c0">OK</span>
<?php } else { ?>
<span style="color:#c00">FAIL</span>
<?php } ?>
</li>
</ol>
<p>Note: Make sure your server-time is <a href="http://en.wikipedia.org/wiki/Network_Time_Protocol">NTP-synced</a>! Depending on the $discrepancy allowed your time cannot drift too much from the users' time!</p>
<?php
try {
$tfa->ensureCorrectTime();
echo 'Your hosts time seems to be correct / within margin';
} catch (RobThree\Auth\TwoFactorAuthException $ex) {
echo '<b>Warning:</b> Your hosts time seems to be off: ' . $ex->getMessage();
}
?>
</body>
</html>