PHPGangsta_GoogleAuthenticator::createSecret PHP Method

    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;
    }

 public function display()
 {
     include_once $this->root_path . 'libraries/twofactor/googleAuthenticator.class.php';
     $ga = new PHPGangsta_GoogleAuthenticator();
     $secret = $ga->createSecret();
     $this->tpl->assign_vars(array('TWOFACTOR_KEY' => $secret, 'TWOFACTOR_QR' => $ga->getQRCodeGoogleUrl(str_replace(' ', '_', 'EQdkpPlus ' . $this->config->get('guildtag')), $secret), 'TWOFACTOR_KEY_ENCR' => rawurlencode(register('encrypt')->encrypt($secret))));
     $this->core->set_vars(array('page_title' => "", 'header_format' => "simple", 'template_file' => 'twofactor_init.html', 'display' => true));
 }