app/admin/g.php

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<?php

/**
 * PHP Class for handling Google Authenticator 2-factor authentication.
 *
 * @author Michael Kliewe
 * @copyright 2012 Michael Kliewe
 * @license http://www.opensource.org/licenses/bsd-license.php BSD License
 *
 * @link http://www.phpgangsta.de/
 */
class PHPGangsta_GoogleAuthenticator
{
    protected $_codeLength = 6;

    /**
     * Create new secret.
     * 16 characters, randomly chosen from the allowed base32 characters.
     *
     * @param int $secretLength
     *
     * @return string
     */
    public function createSecret($secretLength = 16)
    {
        $validChars = $this->_getBase32LookupTable();

        // Valid secret lengths are 80 to 640 bits
        if ($secretLength < 16 || $secretLength > 128) {
            throw new Exception('Bad secret length');
        }
        $secret = '';
        $rnd = false;
        if (function_exists('random_bytes')) {
            $rnd = random_bytes($secretLength);
        } elseif (function_exists('mcrypt_create_iv')) {
            $rnd = mcrypt_create_iv($secretLength, MCRYPT_DEV_URANDOM);
        } elseif (function_exists('openssl_random_pseudo_bytes')) {
            $rnd = openssl_random_pseudo_bytes($secretLength, $cryptoStrong);
            if (!$cryptoStrong) {
                $rnd = false;
            }
        }
        if ($rnd !== false) {
            for ($i = 0; $i < $secretLength; ++$i) {
                $secret .= $validChars[ord($rnd[$i]) & 31];
            }
        } else {
            throw new Exception('No source of secure random');
        }

        return $secret;
    }

    /**
     * Calculate the code, with given secret and point in time.
     *
     * @param string   $secret
     * @param int|null $timeSlice
     *