function __construct($store, $op_endpoint = null)
{
$this->store = $store;
$this->signatory = new Auth_OpenID_Signatory($this->store);
$this->encoder = new Auth_OpenID_SigningEncoder($this->signatory);
$this->decoder = new Auth_OpenID_Decoder($this);
$this->op_endpoint = $op_endpoint;
$this->negotiator = Auth_OpenID_getDefaultNegotiator();
}