846 lines
28 KiB
PHP
846 lines
28 KiB
PHP
<?php
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/**
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* Using this class, you can easily set up an OpenID Provider.
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* It's independent of LightOpenID class.
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* It requires either GMP or BCMath for session encryption,
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* but will work without them (although either via SSL, or in stateless mode only).
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* Also, it requires PHP >= 5.1.2
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*
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* This is an alpha version, using it in production code is not recommended,
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* until you are *sure* that it works and is secure.
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*
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* Please send me messages about your testing results
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* (even if successful, so I know that it has been tested).
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* Also, if you think there's a way to make it easier to use, tell me -- it's an alpha for a reason.
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* Same thing applies to bugs in code, suggestions,
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* and everything else you'd like to say about the library.
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*
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* There's no usage documentation here, see the examples.
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*
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* @author Mewp
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* @copyright Copyright (c) 2010, Mewp
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* @license http://www.opensource.org/licenses/mit-license.php MIT
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*/
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ini_set('error_log','log');
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abstract class LightOpenIDProvider
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{
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# URL-s to XRDS and server location.
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public $xrdsLocation, $serverLocation;
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# Should we operate in server, or signon mode?
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public $select_id = false;
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# Lifetime of an association.
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protected $assoc_lifetime = 600;
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# Variables below are either set automatically, or are constant.
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# -----
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# Can we support DH?
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protected $dh = true;
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protected $ns = 'http://specs.openid.net/auth/2.0';
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protected $data, $assoc;
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# Default DH parameters as defined in the specification.
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protected $default_modulus;
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protected $default_gen = 'Ag==';
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# AX <-> SREG transform
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protected $ax_to_sreg = array(
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'namePerson/friendly' => 'nickname',
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'contact/email' => 'email',
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'namePerson' => 'fullname',
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'birthDate' => 'dob',
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'person/gender' => 'gender',
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'contact/postalCode/home' => 'postcode',
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'contact/country/home' => 'country',
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'pref/language' => 'language',
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'pref/timezone' => 'timezone',
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);
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# Math
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private $add, $mul, $pow, $mod, $div, $powmod;
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# -----
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# ------------------------------------------------------------------------ #
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# Functions you probably want to implement when extending the class.
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/**
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* Checks whether an user is authenticated.
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* The function should determine what fields it wants to send to the RP,
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* and put them in the $attributes array.
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* @param Array $attributes
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* @param String $realm Realm used for authentication.
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* @return String OP-local identifier of an authenticated user, or an empty value.
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*/
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abstract function checkid($realm, &$attributes);
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/**
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* Displays an user interface for inputting user's login and password.
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* Attributes are always AX field namespaces, with stripped host part.
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* For example, the $attributes array may be:
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* array( 'required' => array('namePerson/friendly', 'contact/email'),
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* 'optional' => array('pref/timezone', 'pref/language')
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* @param String $identity Discovered identity string. May be used to extract login, unless using $this->select_id
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* @param String $realm Realm used for authentication.
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* @param String Association handle. must be sent as openid.assoc_handle in $_GET or $_POST in subsequent requests.
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* @param Array User attributes requested by the RP.
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*/
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abstract function setup($identity, $realm, $assoc_handle, $attributes);
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/**
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* Stores an association.
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* If you want to use php sessions in your provider code, you have to replace it.
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* @param String $handle Association handle -- should be used as a key.
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* @param Array $assoc Association data.
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*/
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protected function setAssoc($handle, $assoc)
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{
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$oldSession = session_id();
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session_commit();
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session_id($assoc['handle']);
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session_start();
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$_SESSION['assoc'] = $assoc;
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session_commit();
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if($oldSession) {
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session_id($oldSession);
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session_start();
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}
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}
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/**
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* Retreives association data.
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* If you want to use php sessions in your provider code, you have to replace it.
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* @param String $handle Association handle.
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* @return Array Association data.
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*/
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protected function getAssoc($handle)
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{
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$oldSession = session_id();
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session_commit();
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session_id($handle);
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session_start();
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if(empty($_SESSION['assoc'])) {
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return null;
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}
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return $_SESSION['assoc'];
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session_commit();
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if($oldSession) {
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session_id($oldSession);
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session_start();
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}
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}
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/**
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* Deletes an association.
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* If you want to use php sessions in your provider code, you have to replace it.
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* @param String $handle Association handle.
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*/
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protected function delAssoc($handle)
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{
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$oldSession = session_id();
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session_commit();
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session_id($handle);
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session_start();
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session_destroy();
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if($oldSession) {
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session_id($oldSession);
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session_start();
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}
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}
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# ------------------------------------------------------------------------ #
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# Functions that you might want to implement.
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/**
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* Redirects the user to an url.
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* @param String $location The url that the user will be redirected to.
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*/
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protected function redirect($location)
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{
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header('Location: ' . $location);
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die();
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}
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/**
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* Generates a new association handle.
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* @return string
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*/
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protected function assoc_handle()
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{
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return sha1(microtime());
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}
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/**
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* Generates a random shared secret.
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* @return string
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*/
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protected function shared_secret($hash)
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{
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$length = 20;
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if($hash == 'sha256') {
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$length = 256;
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}
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$secret = '';
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for($i = 0; $i < $length; $i++) {
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$secret .= mt_rand(0,255);
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}
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return $secret;
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}
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/**
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* Generates a private key.
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* @param int $length Length of the key.
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*/
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protected function keygen($length)
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{
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$key = '';
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for($i = 1; $i < $length; $i++) {
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$key .= mt_rand(0,9);
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}
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$key .= mt_rand(1,9);
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return $key;
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}
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# ------------------------------------------------------------------------ #
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# Functions that you probably shouldn't touch.
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function __construct()
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{
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$this->default_modulus =
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'ANz5OguIOXLsDhmYmsWizjEOHTdxfo2Vcbt2I3MYZuYe91ouJ4mLBX+YkcLiemOcPy'
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. 'm2CBRYHNOyyjmG0mg3BVd9RcLn5S3IHHoXGHblzqdLFEi/368Ygo79JRnxTkXjgmY0'
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. 'rxlJ5bU1zIKaSDuKdiI+XUkKJX8Fvf8W8vsixYOr';
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$location = (!empty($_SERVER['HTTPS']) ? 'https' : 'http') . '://'
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. $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
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$location = preg_replace('/\?.*/','',$location);
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$this->serverLocation = $location;
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$location .= (strpos($location, '?') ? '&' : '?') . 'xrds';
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$this->xrdsLocation = $location;
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$this->data = $_GET + $_POST;
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# We choose GMP if avaiable, and bcmath otherwise
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if(function_exists('gmp_add')) {
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$this->add = 'gmp_add';
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$this->mul = 'gmp_mul';
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$this->pow = 'gmp_pow';
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$this->mod = 'gmp_mod';
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$this->div = 'gmp_div';
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$this->powmod = 'gmp_powm';
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} elseif(function_exists('bcadd')) {
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$this->add = 'bcadd';
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$this->mul = 'bcmul';
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$this->pow = 'bcpow';
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$this->mod = 'bcmod';
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$this->div = 'bcdiv';
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$this->powmod = 'bcpowmod';
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} else {
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# If neither are avaiable, we can't use DH
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$this->dh = false;
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}
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# However, we do require the hash functions.
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# They should be built-in anyway.
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if(!function_exists('hash_algos')) {
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$this->dh = false;
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}
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}
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/**
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* Displays an XRDS document, or redirects to it.
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* By default, it detects whether it should display or redirect automatically.
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* @param bool|null $force When true, always display the document, when false always redirect.
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*/
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function xrds($force=null)
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{
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if($force) {
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echo $this->xrdsContent();
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die();
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} elseif($force === false) {
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header('X-XRDS-Location: '. $this->xrdsLocation);
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return;
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}
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if (isset($_GET['xrds'])
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|| (isset($_SERVER['HTTP_ACCEPT']) && strpos($_SERVER['HTTP_ACCEPT'], 'application/xrds+xml') !== false)
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) {
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header('Content-Type: application/xrds+xml');
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echo $this->xrdsContent();
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die();
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}
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header('X-XRDS-Location: ' . $this->xrdsLocation);
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}
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/**
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* Returns the content of the XRDS document
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* @return String The XRDS document.
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*/
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protected function xrdsContent()
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{
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$lines = array(
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'<?xml version="1.0" encoding="UTF-8"?>',
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'<xrds:XRDS xmlns:xrds="xri://$xrds" xmlns="xri://$xrd*($v*2.0)">',
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'<XRD>',
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' <Service>',
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' <Type>' . $this->ns . '/' . ($this->select_id ? 'server' : 'signon') .'</Type>',
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' <URI>' . $this->serverLocation . '</URI>',
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' </Service>',
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'</XRD>',
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'</xrds:XRDS>'
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);
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return implode("\n", $lines);
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}
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/**
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* Does everything that a provider has to -- in one function.
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*/
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function server()
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{
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if(isset($this->data['openid_assoc_handle'])) {
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$this->assoc = $this->getAssoc($this->data['openid_assoc_handle']);
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if(isset($this->assoc['data'])) {
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# We have additional data stored for setup.
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$this->data += $this->assoc['data'];
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unset($this->assoc['data']);
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}
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}
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if (isset($this->data['openid_ns'])
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&& $this->data['openid_ns'] == $this->ns
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) {
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if(!isset($this->data['openid_mode'])) $this->errorResponse();
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switch($this->data['openid_mode'])
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{
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case 'checkid_immediate':
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case 'checkid_setup':
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$this->checkRealm();
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# We support AX xor SREG.
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$attributes = $this->ax();
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if(!$attributes) {
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$attributes = $this->sreg();
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}
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# Even if some user is authenticated, we need to know if it's
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# the same one that want's to authenticate.
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# Of course, if we use select_id, we accept any user.
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if (($identity = $this->checkid($this->data['openid_realm'], $attrValues))
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&& ($this->select_id || $identity == $this->data['openid_identity'])
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) {
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$this->positiveResponse($identity, $attrValues);
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} elseif($this->data['openid_mode'] == 'checkid_immediate') {
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$this->redirect($this->response(array('openid.mode' => 'setup_needed')));
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} else {
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if(!$this->assoc) {
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$this->generateAssociation();
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$this->assoc['private'] = true;
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}
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$this->assoc['data'] = $this->data;
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$this->setAssoc($this->assoc['handle'], $this->assoc);
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$this->setup($this->data['openid_identity'],
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$this->data['openid_realm'],
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$this->assoc['handle'],
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$attributes);
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}
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break;
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case 'associate':
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$this->associate();
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break;
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case 'check_authentication':
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$this->checkRealm();
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if($this->verify()) {
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echo "ns:$this->ns\nis_valid:true";
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if(strpos($this->data['openid_signed'],'invalidate_handle') !== false) {
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echo "\ninvalidate_handle:" . $this->data['openid_invalidate_handle'];
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}
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} else {
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echo "ns:$this->ns\nis_valid:false";
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}
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die();
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break;
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default:
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$this->errorResponse();
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}
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} else {
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$this->xrds();
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}
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}
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protected function checkRealm()
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{
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if (!isset($this->data['openid_return_to'], $this->data['openid_realm'])) {
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$this->errorResponse();
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}
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$realm = str_replace('\*', '[^/]', preg_quote($this->data['openid_realm']));
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if(!preg_match("#^$realm#", $this->data['openid_return_to'])) {
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$this->errorResponse();
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}
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}
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protected function ax()
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{
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# Namespace prefix that the fields must have.
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$ns = 'http://axschema.org/';
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# First, we must find out what alias is used for AX.
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# Let's check the most likely one
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$alias = null;
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if (isset($this->data['openid_ns_ax'])
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&& $this->data['openid_ns_ax'] == 'http://openid.net/srv/ax/1.0'
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) {
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$alias = 'ax';
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} else {
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foreach($this->data as $name => $value) {
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if ($value == 'http://openid.net/srv/ax/1.0'
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&& preg_match('/openid_ns_(.+)/', $name, $m)
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) {
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$alias = $m[1];
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break;
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}
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}
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}
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if(!$alias) {
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return null;
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}
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$fields = array();
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# Now, we must search again, this time for field aliases
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foreach($this->data as $name => $value) {
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if (strpos($name, 'openid_' . $alias . '_type') === false
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|| strpos($value, $ns) === false) {
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continue;
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}
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$name = substr($name, strlen('openid_' . $alias . '_type_'));
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$value = substr($value, strlen($ns));
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$fields[$name] = $value;
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}
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# Then, we find out what fields are required and optional
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$required = array();
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$if_available = array();
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foreach(array('required','if_available') as $type) {
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if(empty($this->data["openid_{$alias}_{$type}"])) {
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continue;
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}
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$attributes = explode(',', $this->data["openid_{$alias}_{$type}"]);
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foreach($attributes as $attr) {
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if(empty($fields[$attr])) {
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# There is an undefined field here, so we ignore it.
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continue;
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}
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${$type}[] = $fields[$attr];
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}
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}
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$this->data['ax'] = true;
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return array('required' => $required, 'optional' => $if_available);
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}
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protected function sreg()
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{
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$sreg_to_ax = array_flip($this->ax_to_sreg);
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$attributes = array('required' => array(), 'optional' => array());
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if (empty($this->data['openid_sreg_required'])
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&& empty($this->data['openid_sreg_optional'])
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) {
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return $attributes;
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}
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foreach(array('required', 'optional') as $type) {
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foreach(explode(',',$this->data['openid_sreg_' . $type]) as $attr) {
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if(empty($sreg_to_ax[$attr])) {
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# Undefined attribute in SREG request.
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# Shouldn't happen, but we check anyway.
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continue;
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}
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$attributes[$type][] = $sreg_to_ax[$attr];
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}
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}
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return $attributes;
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}
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/**
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* Aids an RP in assertion verification.
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* @return bool Information whether the verification suceeded.
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*/
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protected function verify()
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{
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# Firstly, we need to make sure that there's an association.
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# Otherwise the verification will fail,
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# because we've signed assoc_handle in the assertion
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if(empty($this->assoc)) {
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return false;
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}
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# Next, we check that it's a private association,
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# i.e. one made without RP input.
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# Otherwise, the RP shouldn't ask us to verify.
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if(empty($this->assoc['private'])) {
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return false;
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}
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# Now we have to check if the nonce is correct, to prevent replay attacks.
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if($this->data['openid_response_nonce'] != $this->assoc['nonce']) {
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return false;
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}
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# Getting the signed fields for signature.
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$sig = array();
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$signed = explode(',', $this->data['openid_signed']);
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foreach($signed as $field) {
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$name = strtr($field, '.', '_');
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if(!isset($this->data['openid_' . $name])) {
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return false;
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}
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$sig[$field] = $this->data['openid_' . $name];
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}
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# Computing the signature and checking if it matches.
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$sig = $this->keyValueForm($sig);
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if ($this->data['openid_sig'] !=
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base64_encode(hash_hmac($this->assoc['hash'], $sig, $this->assoc['mac'], true))
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) {
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return false;
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}
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# Clearing the nonce, so that it won't be used again.
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$this->assoc['nonce'] = null;
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if(empty($this->assoc['private'])) {
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# Commiting changes to the association.
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$this->setAssoc($this->assoc['handle'], $this->assoc);
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} else {
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# Private associations shouldn't be used again, se we can as well delete them.
|
|
$this->delAssoc($this->assoc['handle']);
|
|
}
|
|
|
|
# Nothing has failed, so the verification was a success.
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Performs association with an RP.
|
|
*/
|
|
protected function associate()
|
|
{
|
|
# Rejecting no-encryption without TLS.
|
|
if(empty($_SERVER['HTTPS']) && $this->data['openid_session_type'] == 'no-encryption') {
|
|
$this->directErrorResponse();
|
|
}
|
|
|
|
# Checking whether we support DH at all.
|
|
if (!$this->dh && substr($this->data['openid_session_type'], 0, 2) == 'DH') {
|
|
$this->redirect($this->response(array(
|
|
'openid.error' => 'DH not supported',
|
|
'openid.error_code' => 'unsupported-type',
|
|
'openid.session_type' => 'no-encryption'
|
|
)));
|
|
}
|
|
|
|
# Creating the association
|
|
$this->assoc = array();
|
|
$this->assoc['hash'] = $this->data['openid_assoc_type'] == 'HMAC-SHA256' ? 'sha256' : 'sha1';
|
|
$this->assoc['handle'] = $this->assoc_handle();
|
|
|
|
# Getting the shared secret
|
|
if($this->data['openid_session_type'] == 'no-encryption') {
|
|
$this->assoc['mac'] = base64_encode($this->shared_secret($this->assoc['hash']));
|
|
} else {
|
|
$this->dh();
|
|
}
|
|
|
|
# Preparing the direct response...
|
|
$response = array(
|
|
'ns' => $this->ns,
|
|
'assoc_handle' => $this->assoc['handle'],
|
|
'assoc_type' => $this->data['openid_assoc_type'],
|
|
'session_type' => $this->data['openid_session_type'],
|
|
'expires_in' => $this->assoc_lifetime
|
|
);
|
|
|
|
if(isset($this->assoc['dh_server_public'])) {
|
|
$response['dh_server_public'] = $this->assoc['dh_server_public'];
|
|
$response['enc_mac_key'] = $this->assoc['mac'];
|
|
} else {
|
|
$response['mac_key'] = $this->assoc['mac'];
|
|
}
|
|
|
|
# ...and sending it.
|
|
echo $this->keyValueForm($response);
|
|
die();
|
|
}
|
|
|
|
/**
|
|
* Creates a private association.
|
|
*/
|
|
protected function generateAssociation()
|
|
{
|
|
$this->assoc = array();
|
|
# We use sha1 by default.
|
|
$this->assoc['hash'] = 'sha1';
|
|
$this->assoc['mac'] = $this->shared_secret('sha1');
|
|
$this->assoc['handle'] = $this->assoc_handle();
|
|
}
|
|
|
|
/**
|
|
* Encrypts the MAC key using DH key exchange.
|
|
*/
|
|
protected function dh()
|
|
{
|
|
if(empty($this->data['openid_dh_modulus'])) {
|
|
$this->data['openid_dh_modulus'] = $this->default_modulus;
|
|
}
|
|
|
|
if(empty($this->data['openid_dh_gen'])) {
|
|
$this->data['openid_dh_gen'] = $this->default_gen;
|
|
}
|
|
|
|
if(empty($this->data['openid_dh_consumer_public'])) {
|
|
$this->directErrorResponse();
|
|
}
|
|
|
|
$modulus = $this->b64dec($this->data['openid_dh_modulus']);
|
|
$gen = $this->b64dec($this->data['openid_dh_gen']);
|
|
$consumerKey = $this->b64dec($this->data['openid_dh_consumer_public']);
|
|
|
|
$privateKey = $this->keygen(strlen($modulus));
|
|
$publicKey = $this->powmod($gen, $privateKey, $modulus);
|
|
$ss = $this->powmod($consumerKey, $privateKey, $modulus);
|
|
|
|
$mac = $this->x_or(hash($this->assoc['hash'], $ss, true), $this->shared_secret($this->assoc['hash']));
|
|
$this->assoc['dh_server_public'] = $this->decb64($publicKey);
|
|
$this->assoc['mac'] = base64_encode($mac);
|
|
}
|
|
|
|
/**
|
|
* XORs two strings.
|
|
* @param String $a
|
|
* @param String $b
|
|
* @return String $a ^ $b
|
|
*/
|
|
protected function x_or($a, $b)
|
|
{
|
|
$length = strlen($a);
|
|
for($i = 0; $i < $length; $i++) {
|
|
$a[$i] = $a[$i] ^ $b[$i];
|
|
}
|
|
|
|
return $a;
|
|
}
|
|
|
|
/**
|
|
* Prepares an indirect response url.
|
|
* @param array $params Parameters to be sent.
|
|
*/
|
|
protected function response($params)
|
|
{
|
|
$params += array('openid.ns' => $this->ns);
|
|
return $this->data['openid_return_to']
|
|
. (strpos($this->data['openid_return_to'],'?') ? '&' : '?')
|
|
. http_build_query($params, '', '&');
|
|
}
|
|
|
|
/**
|
|
* Outputs a direct error.
|
|
*/
|
|
protected function errorResponse()
|
|
{
|
|
if(!empty($this->data['openid_return_to'])) {
|
|
$response = array(
|
|
'openid.mode' => 'error',
|
|
'openid.error' => 'Invalid request'
|
|
);
|
|
$this->redirect($this->response($response));
|
|
} else {
|
|
header('HTTP/1.1 400 Bad Request');
|
|
$response = array(
|
|
'ns' => $this->ns,
|
|
'error' => 'Invalid request'
|
|
);
|
|
echo $this->keyValueForm($response);
|
|
}
|
|
die();
|
|
}
|
|
|
|
/**
|
|
* Sends an positive assertion.
|
|
* @param String $identity the OP-Local Identifier that is being authenticated.
|
|
* @param Array $attributes User attributes to be sent.
|
|
*/
|
|
protected function positiveResponse($identity, $attributes)
|
|
{
|
|
# We generate a private association if there is none established.
|
|
if(!$this->assoc) {
|
|
$this->generateAssociation();
|
|
$this->assoc['private'] = true;
|
|
}
|
|
|
|
# We set openid.identity (and openid.claimed_id if necessary) to our $identity
|
|
if($this->data['openid_identity'] == $this->data['openid_claimed_id'] || $this->select_id) {
|
|
$this->data['openid_claimed_id'] = $identity;
|
|
}
|
|
$this->data['openid_identity'] = $identity;
|
|
|
|
# Preparing fields to be signed
|
|
$params = array(
|
|
'op_endpoint' => $this->serverLocation,
|
|
'claimed_id' => $this->data['openid_claimed_id'],
|
|
'identity' => $this->data['openid_identity'],
|
|
'return_to' => $this->data['openid_return_to'],
|
|
'realm' => $this->data['openid_realm'],
|
|
'response_nonce' => gmdate("Y-m-d\TH:i:s\Z"),
|
|
'assoc_handle' => $this->assoc['handle'],
|
|
);
|
|
|
|
$params += $this->responseAttributes($attributes);
|
|
|
|
# Has the RP used an invalid association handle?
|
|
if (isset($this->data['openid_assoc_handle'])
|
|
&& $this->data['openid_assoc_handle'] != $this->assoc['handle']
|
|
) {
|
|
$params['invalidate_handle'] = $this->data['openid_assoc_handle'];
|
|
}
|
|
|
|
# Signing the $params
|
|
$sig = hash_hmac($this->assoc['hash'], $this->keyValueForm($params), $this->assoc['mac'], true);
|
|
$req = array(
|
|
'openid.mode' => 'id_res',
|
|
'openid.signed' => implode(',', array_keys($params)),
|
|
'openid.sig' => base64_encode($sig),
|
|
);
|
|
|
|
# Saving the nonce and commiting the association.
|
|
$this->assoc['nonce'] = $params['response_nonce'];
|
|
$this->setAssoc($this->assoc['handle'], $this->assoc);
|
|
|
|
# Preparing and sending the response itself
|
|
foreach($params as $name => $value) {
|
|
$req['openid.' . $name] = $value;
|
|
}
|
|
|
|
$this->redirect($this->response($req));
|
|
}
|
|
|
|
/**
|
|
* Prepares an array of attributes to send
|
|
*/
|
|
protected function responseAttributes($attributes)
|
|
{
|
|
if(!$attributes) return array();
|
|
|
|
$ns = 'http://axschema.org/';
|
|
|
|
$response = array();
|
|
if(isset($this->data['ax'])) {
|
|
$response['ns.ax'] = 'http://openid.net/srv/ax/1.0';
|
|
foreach($attributes as $name => $value) {
|
|
$alias = strtr($name, '/', '_');
|
|
$response['ax.type.' . $alias] = $ns . $name;
|
|
$response['ax.value.' . $alias] = $value;
|
|
}
|
|
return $response;
|
|
}
|
|
|
|
foreach($attributes as $name => $value) {
|
|
if(!isset($this->ax_to_sreg[$name])) {
|
|
continue;
|
|
}
|
|
|
|
$response['sreg.' . $this->ax_to_sreg[$name]] = $value;
|
|
}
|
|
return $response;
|
|
}
|
|
|
|
/**
|
|
* Encodes fields in key-value form.
|
|
* @param Array $params Fields to be encoded.
|
|
* @return String $params in key-value form.
|
|
*/
|
|
protected function keyValueForm($params)
|
|
{
|
|
$str = '';
|
|
foreach($params as $name => $value) {
|
|
$str .= "$name:$value\n";
|
|
}
|
|
|
|
return $str;
|
|
}
|
|
|
|
/**
|
|
* Responds with an information that the user has canceled authentication.
|
|
*/
|
|
protected function cancel()
|
|
{
|
|
$this->redirect($this->response(array('openid.mode' => 'cancel')));
|
|
}
|
|
|
|
/**
|
|
* Converts base64 encoded number to it's decimal representation.
|
|
* @param String $str base64 encoded number.
|
|
* @return String Decimal representation of that number.
|
|
*/
|
|
protected function b64dec($str)
|
|
{
|
|
$bytes = unpack('C*', base64_decode($str));
|
|
$n = 0;
|
|
foreach($bytes as $byte) {
|
|
$n = $this->add($this->mul($n, 256), $byte);
|
|
}
|
|
|
|
return $n;
|
|
}
|
|
|
|
/**
|
|
* Complements b64dec.
|
|
*/
|
|
protected function decb64($num)
|
|
{
|
|
$bytes = array();
|
|
while($num) {
|
|
array_unshift($bytes, $this->mod($num, 256));
|
|
$num = $this->div($num, 256);
|
|
}
|
|
|
|
if($bytes && $bytes[0] > 127) {
|
|
array_unshift($bytes,0);
|
|
}
|
|
|
|
array_unshift($bytes, 'C*');
|
|
|
|
return base64_encode(call_user_func_array('pack', $bytes));
|
|
}
|
|
|
|
function __call($name, $args)
|
|
{
|
|
switch($name) {
|
|
case 'add':
|
|
case 'mul':
|
|
case 'pow':
|
|
case 'mod':
|
|
case 'div':
|
|
case 'powmod':
|
|
if(function_exists('gmp_strval')) {
|
|
return gmp_strval(call_user_func_array($this->$name, $args));
|
|
}
|
|
return call_user_func_array($this->$name, $args);
|
|
default:
|
|
throw new BadMethodCallException();
|
|
}
|
|
}
|
|
}
|