Auth_OpenID_DiffieHellmanSHA1ConsumerSession::extractSecret PHP Метод

    function extractSecret($response)
    {
        if (!$response->hasKey(Auth_OpenID_OPENID_NS, 'dh_server_public')) {
            return null;
        }
        if (!$response->hasKey(Auth_OpenID_OPENID_NS, 'enc_mac_key')) {
            return null;
        }
        $math = Auth_OpenID_getMathLib();
        $spub = $math->base64ToLong($response->getArg(Auth_OpenID_OPENID_NS, 'dh_server_public'));
        $enc_mac_key = base64_decode($response->getArg(Auth_OpenID_OPENID_NS, 'enc_mac_key'));
        return $this->dh->xorSecret($spub, $enc_mac_key, $this->hash_func);
    }