/**
* @param $type
* @param $mac_function
* @param $lifetime
* @param $realm
* @return IAssociation
*/
private function buildAssociation($type, $mac_function, $lifetime, $realm)
{
$new_secret = OpenIdCryptoHelper::generateSecret($mac_function);
$new_handle = AssocHandleGenerator::generate();
$expires_in = intval($lifetime);
$issued = gmdate("Y-m-d H:i:s", time());
return new Association($new_handle, $new_secret, $mac_function, $expires_in, $issued, $type, $realm);
}