/**
* Generate a private key per session and store in session.
*
* @return string
* private key for this session
*/
public static function privateKey()
{
if (!self::$_key) {
$session = CRM_Core_Session::singleton();
self::$_key = $session->get('qfPrivateKey');
if (!self::$_key) {
self::$_key = md5(uniqid(mt_rand(), TRUE)) . md5(uniqid(mt_rand(), TRUE));
$session->set('qfPrivateKey', self::$_key);
}
}
return self::$_key;
}
