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phpmyid.php
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<?php
// PLEASE DO NOT EDIT THIS FILE UNLESS YOU KNOW WHAT YOU ARE DOING!
/**
* phpMyID - A standalone, single user, OpenID Identity Provider
*
* @package phpMyID
* @author CJ Niemira <siege (at) siege (dot) org>
* @copyright 2006-2008
* @license http://www.gnu.org/licenses/gpl.html GNU Public License
* @url http://siege.org/projects/phpMyID
* @version 0.9
* @Some modifications by Thorium, https://github.com/Thorium/smf-openid-server
*/
#Debug:
#ini_set('display_errors', 'On');
$wgSMFVersion = "2.0";
$wgSMFLogin = true;
$wgSMFPath = "../forum";
$wgSMFAdminGroupName = array('Wiki Admin', 'Global Moderator', 'Administrator');
require_once("./Auth_SMF.php");
$wgAuth = new Auth_SMF();
/**
* Set a constant to indicate that phpMyID is running
*/
define('PHPMYID_STARTED', true);
/**
* List the known types and modes
* @name $known
* @global array $GLOBALS['known']
*/
$GLOBALS['known'] = array(
'assoc_types' => array('HMAC-SHA1'),
'openid_modes' => array('accept',
'associate',
'authorize',
'cancel',
'checkid_immediate',
'checkid_setup',
'check_authentication',
'error',
'id_res',
'login',
'logout',
'test'),
'session_types' => array('',
'DH-SHA1'),
'bigmath_types' => array('DH-SHA1'),
);
/**
* Defined by OpenID spec
* @name $g
* @global integer $GLOBALS['g']
*/
$GLOBALS['g'] = 2;
/**
* Defined by OpenID spec
* @name $p
* @global integer $GLOBALS['p']
*/
$GLOBALS['p'] = '155172898181473697471232257763715539915724801966915404479707' .
'7953140576293785419175806512274236981889937278161526466314385615958256881888' .
'8995127215884267541995034125870655654980358010487053768147672651325574704076' .
'5857479291291572334510643245094715007229621094194349783925984760375594985848' .
'253359305585439638443';
if(!isset($_GET["u"]))
wrap_html('We need your user-ID as query string parameter. http://.../.../?u=(your-id-here) ');
else {
$reqidkey = "lxa_logged_in".md5($_GET["u"]);
if(!isset($GLOBALS[$reqidkey])) $GLOBALS[$reqidkey] = lxa_logged_in();
}
// Runmode functions
/**
* Allow the user to accept trust on a URL
* @global array $profile
*/
function accept_mode () {
global $profile;
// this is a user session
user_session();
// the user needs refresh urls in their session to access this mode
if (! isset($_SESSION['post_accept_url']) || ! isset($_SESSION['cancel_accept_url']) || ! isset($_SESSION['unaccepted_url']))
error_500('Session-variables not set. You may not access this mode directly.');
// has the user accepted the trust_root?
$accepted = @strlen($_REQUEST['accepted'])
? $_REQUEST['accepted']
: null;
// if so, refresh back to post_accept_url
if ($accepted === 'yes') {
$_SESSION['accepted_url'] = $_SESSION['unaccepted_url'];
wrap_redirect($_SESSION['post_accept_url']);
// if they rejected it, return to the client
} elseif ($accepted === 'no') {
wrap_redirect($_SESSION['cancel_accept_url']);
}
// if neither, offer the trust request
$q = strpos($profile['req_url'], '?') ? '&' : '?';
$yes = $profile['req_url'] . $q . 'accepted=yes';
$no = $profile['req_url'] . $q . 'accepted=no';
wrap_html('The client site you are attempting to log into has requested that you trust the following URL:<br/><b>' . $_SESSION['unaccepted_url'] . '</b><br/><br/>Do you wish to continue?<br/><a href="' . $yes . '">Yes</a> | <a href="' . $no . '">No</a>');
}
/** * Perform an association with a consumer
* @global array $known
* @global array $profile
* @global integer $g
* @global integer $p
*/
function associate_mode () {
global $g, $known, $p, $profile;
// Validate the request
if (! isset($_REQUEST['openid_mode']) || $_REQUEST['openid_mode'] != 'associate')
error_400();
// Get the request options, using defaults as necessary
$assoc_type = (@strlen($_REQUEST['openid_assoc_type'])
&& in_array($_REQUEST['openid_assoc_type'], $known['assoc_types']))
? $_REQUEST['openid_assoc_type']
: 'HMAC-SHA1';
$session_type = (@strlen($_REQUEST['openid_session_type'])
&& in_array($_REQUEST['openid_session_type'], $known['session_types']))
? $_REQUEST['openid_session_type']
: '';
$dh_modulus = (@strlen($_REQUEST['openid_dh_modulus']))
? long(base64_decode($_REQUEST['openid_dh_modulus']))
: ($session_type == 'DH-SHA1'
? $p
: null);
$dh_gen = (@strlen($_REQUEST['openid_dh_gen']))
? long(base64_decode($_REQUEST['openid_dh_gen']))
: ($session_type == 'DH-SHA1'
? $g
: null);
$dh_consumer_public = (@strlen($_REQUEST['openid_dh_consumer_public']))
? $_REQUEST['openid_dh_consumer_public']
: ($session_type == 'DH-SHA1'
? error_post('dh_consumer_public was not specified')
: null);
$lifetime = time() + $profile['lifetime'];
// Create standard keys
$keys = array(
'assoc_type' => $assoc_type,
'expires_in' => $profile['lifetime']
);
// If I can't handle bigmath, default to plaintext sessions
if (in_array($session_type, $known['bigmath_types']) && $profile['use_bigmath'] === false)
$session_type = null;
// Add response keys based on the session type
switch ($session_type) {
case 'DH-SHA1':
// Create the associate id and shared secret now
list ($assoc_handle, $shared_secret) = new_assoc($lifetime);
// Compute the Diffie-Hellman stuff
$private_key = random($dh_modulus);
$public_key = bmpowmod($dh_gen, $private_key, $dh_modulus);
$remote_key = long(base64_decode($dh_consumer_public));
$ss = bmpowmod($remote_key, $private_key, $dh_modulus);
$keys['assoc_handle'] = $assoc_handle;
$keys['session_type'] = $session_type;
$keys['dh_server_public'] = base64_encode(bin($public_key));
$keys['enc_mac_key'] = base64_encode(x_or(sha1_20(bin($ss)), $shared_secret));
break;
default:
// Create the associate id and shared secret now
list ($assoc_handle, $shared_secret) = new_assoc($lifetime);
$keys['assoc_handle'] = $assoc_handle;
$keys['mac_key'] = base64_encode($shared_secret);
}
// Return the keys
wrap_kv($keys);
}
/**
* Perform a user authorization
* @global array $profile
*/
function authorize_mode () {
global $profile, $baseurl;
// this is a user session
user_session();
if ( isset($_GET["board"]) && $_GET["board"] == "redirect" ) {
/*smf_sessionSetup();
$sid = $_SESSION["oid_session"];
session_write_close();
session_id($sid);
session_start();
session_write_close();
session_start();*/
}
// the user needs refresh urls in their session to access this mode
if (! isset($_SESSION['post_auth_url']) || ! isset($_SESSION['cancel_auth_url']))
error_500('Session-variables not set. You may not access this mode directly. If this is the first login, please try again.');
$stale = false;
// is the user trying to log in?
$reqidkey = "lxa_logged_in".md5($_GET["u"]);
if ( isset($GLOBALS[$reqidkey]) && $GLOBALS[$reqidkey] && $profile['authorized'] === false) {
debug('Authentication successful for SMF user: ' . $GLOBALS[$reqidkey]);
debug('User session is: ' . session_id());
$_SESSION['auth_username'] = $GLOBALS[$reqidkey];
$_SESSION['auth_url'] = $profile['idp_url'];
$profile['authorized'] = true;
// return to the refresh url if they get in
wrap_redirect($_SESSION['post_auth_url']);
exit;
/*
// does this make too many failures?
if (strcmp(hexdec($hdr['nc']), 4) > 0 || $_SESSION['failures'] > 4) {
debug('Too many password failures');
error_get($_SESSION['cancel_auth_url'], 'Too many password failures. Double check your authorization realm. You must restart your browser to try again.');
}*/
}
$sid = session_id();
session_regenerate_id(); // just for smf_sessionSetup
$_SESSION = array();
smf_sessionSetup();
$_SESSION['old_url'] = "http://" . $_SERVER["HTTP_HOST"] . $_SERVER["REQUEST_URI"] . "&board=redirect";
$_SESSION['login_url'] = $_SESSION['old_url'];
$_SESSION['oid_session'] = $sid;// $oid_session;
smf_sessionWrite($_COOKIE['PHPSESSID'], session_encode());
header('Location: http://www.mydomain.net/forum/index.php?action=login2&sa=salt');
}
/**
* Handle a consumer's request for cancellation.
*/
function cancel_mode () {
wrap_html('Request cancelled.');
}
/**
* Handle a consumer's request to see if the user is authenticated
*/
function check_authentication_mode () {
// Validate the request
if (! isset($_REQUEST['openid_mode']) || $_REQUEST['openid_mode'] != 'check_authentication')
error_400();
$assoc_handle = @strlen($_REQUEST['openid_assoc_handle'])
? $_REQUEST['openid_assoc_handle']
: error_post('Missing assoc_handle');
$sig = @strlen($_REQUEST['openid_sig'])
? $_REQUEST['openid_sig']
: error_post('Missing sig');
$signed = @strlen($_REQUEST['openid_signed'])
? $_REQUEST['openid_signed']
: error_post('Missing signed');
// Prepare the return keys
$keys = array(
'openid.mode' => 'id_res'
);
// Invalidate the assoc handle if we need to
if (@strlen($_REQUEST['openid_invalidate_handle'])) {
destroy_assoc_handle($_REQUEST['openid_invalidate_handle']);
$keys['invalidate_handle'] = $_REQUEST['openid_invalidate_handle'];
}
// Validate the sig by recreating the kv pair and signing
$_REQUEST['openid_mode'] = 'id_res';
$tokens = '';
foreach (explode(',', $signed) as $param) {
$post = preg_replace('/\./', '_', $param);
$tokens .= sprintf("%s:%s\n", $param, $_REQUEST['openid_' . $post]);
}
// Add the sreg stuff, if we've got it
if (isset($sreg_required)) {
foreach (explode(',', $sreg_required) as $key) {
if (! isset($sreg[$key]))
continue;
$skey = 'sreg.' . $key;
$tokens .= sprintf("%s:%s\n", $skey, $sreg[$key]);
$keys[$skey] = $sreg[$key];
$fields[] = $skey;
}
}
// Look up the consumer's shared_secret and timeout
list ($shared_secret, $expires) = secret($assoc_handle);
// if I can't verify the assoc_handle, or if it's expired
if ($shared_secret == false || (is_numeric($expires) && $expires < time())) {
$keys['is_valid'] = 'false';
} else {
$ok = base64_encode(hmac($shared_secret, $tokens));
$keys['is_valid'] = ($sig == $ok) ? 'true' : 'false';
}
// Return the keys
wrap_kv($keys);
}
/**
* Handle a consumer's request to see if the end user is logged in
* @global array $known
* @global array $profile
* @global array $sreg
*/
function checkid ( $wait ) {
debug("checkid: wait? $wait");
global $known, $profile, $sreg;
// This is a user session
user_session();
// Get the options, use defaults as necessary
$return_to = @strlen($_REQUEST['openid_return_to'])
? $_REQUEST['openid_return_to']
: error_400('Missing return_to');
$identity = @strlen($_REQUEST['openid_identity'])
? $_REQUEST['openid_identity']
: error_get($return_to, 'Missing identity');
$assoc_handle = @strlen($_REQUEST['openid_assoc_handle'])
? $_REQUEST['openid_assoc_handle']
: null;
$trust_root = @strlen($_REQUEST['openid_trust_root'])
? $_REQUEST['openid_trust_root']
: $return_to;
$sreg_required = @strlen($_REQUEST['openid_sreg_required'])
? $_REQUEST['openid_sreg_required']
: '';
$sreg_optional = @strlen($_REQUEST['openid_sreg_optional'])
? $_REQUEST['openid_sreg_optional']
: '';
// determine the cancel url
$q = strpos($return_to, '?') ? '&' : '?';
$cancel_url = $return_to . $q . 'openid.mode=cancel';
// required and optional make no difference to us
$sreg_required .= ',' . $sreg_optional;
// do the trust_root analysis
if ($trust_root != $return_to) {
// the urls are not the same, be sure return decends from trust
if (! url_descends($return_to, $trust_root))
error_500('Invalid trust_root: "' . $trust_root . '"');
}
// transfer the user to the url accept mode if they're paranoid
if ($wait == 1 && isset($profile['paranoid']) && $profile['paranoid'] === true && (! session_is_registered('accepted_url') || $_SESSION['accepted_url'] != $trust_root)) {
$_SESSION['cancel_accept_url'] = $cancel_url;
$_SESSION['post_accept_url'] = $profile['req_url'];
$_SESSION['unaccepted_url'] = $trust_root;
debug('Transferring to acceptance mode.');
debug('Cancel URL: ' . $_SESSION['cancel_accept_url']);
debug('Post URL: ' . $_SESSION['post_accept_url']);
$q = strpos($profile['idp_url'], '?') ? '&' : '?';
wrap_redirect($profile['idp_url'] . $q . 'openid.mode=accept');
}
/*
TODO: this fails in the beginning where we don't know the identity yet.
so what is the meaning of this code?
// make sure i am this identifier
if ($identity != $profile['idp_url']) {
debug("Invalid identity: $identity");
debug("IdP URL: " . $profile['idp_url']);
error_get($return_to, "Invalid identity: '$identity'");
}*/
// begin setting up return keys
$keys = array(
'mode' => 'id_res'
);
// if the user is not logged in, transfer to the authorization mode
if ($profile['authorized'] === false /* || $identity != $_SESSION['auth_url'] */) {
// users can only be logged in to one url at a time
$_SESSION['auth_username'] = null;
$_SESSION['auth_url'] = null;
if ($wait) {
$_SESSION['cancel_auth_url'] = $cancel_url;
$_SESSION['post_auth_url'] = $profile['req_url'];
debug('Transferring to authorization mode.');
debug('Cancel URL: ' . $_SESSION['cancel_auth_url']);
debug('Post URL: ' . $_SESSION['post_auth_url']);
$q = strpos($profile['idp_url'], '?') ? '&' : '?';
wrap_redirect($profile['idp_url'] . $q . 'openid.mode=authorize');
} else {
$keys['user_setup_url'] = $profile['idp_url'];
}
// the user is logged in
} else {
// remove the refresh URLs if set
unset($_SESSION['cancel_auth_url']);
unset($_SESSION['post_auth_url']);
// check the assoc handle
list($shared_secret, $expires) = secret($assoc_handle);
// if I can't verify the assoc_handle, or if it's expired
if ($shared_secret == false || (is_numeric($expires) && $expires < time())) {
debug("Session expired or missing key: $expires < " . time());
if ($assoc_handle != null) {
$keys['invalidate_handle'] = $assoc_handle;
destroy_assoc_handle($assoc_handle);
}
$lifetime = time() + $profile['lifetime'];
list ($assoc_handle, $shared_secret) = new_assoc($lifetime);
}
$keys['identity'] = $profile['idp_url'];
$keys['assoc_handle'] = $assoc_handle;
$keys['return_to'] = $return_to;
$fields = array_keys($keys);
$tokens = '';
foreach ($fields as $key)
$tokens .= sprintf("%s:%s\n", $key, $keys[$key]);
// add sreg keys
foreach (explode(',', $sreg_required) as $key) {
if (! isset($sreg[$key]))
continue;
$skey = 'sreg.' . $key;
$tokens .= sprintf("%s:%s\n", $skey, $sreg[$key]);
$keys[$skey] = $sreg[$key];
$fields[] = $skey;
}
$keys['signed'] = implode(',', $fields);
$keys['sig'] = base64_encode(hmac($shared_secret, $tokens));
}
wrap_keyed_redirect($return_to, $keys);
}
/**
* Handle a consumer's request to see if the user is already logged in
*/
function checkid_immediate_mode () {
if (! isset($_REQUEST['openid_mode']) || $_REQUEST['openid_mode'] != 'checkid_immediate')
error_500();
checkid(false);
}
/**
* Handle a consumer's request to see if the user is logged in, but be willing
* to wait for them to perform a login if they're not
*/
function checkid_setup_mode () {
if (! isset($_REQUEST['openid_mode']) || $_REQUEST['openid_mode'] != 'checkid_setup')
error_500();
checkid(true);
}
/**
* Handle errors
*/
function error_mode () {
isset($_REQUEST['openid_error'])
? wrap_html($_REQUEST['openid_error'])
: error_500();
}
/**
* Show a user if they are logged in or not
* @global array $profile
*/
function id_res_mode () {
global $profile;
user_session();
if ($profile['authorized'])
wrap_html('You are logged in as ' . $_SESSION['auth_username']);
wrap_html('You are not logged in. (Page may have expired.)');
}
/**
* Allow a user to perform a static login
* @global array $profile
*/
function login_mode () {
global $profile;
user_session();
if ($profile['authorized'])
id_res_mode();
$keys = array(
'mode' => 'checkid_setup',
'identity' => $profile['idp_url'],
'return_to' => $profile['idp_url']
);
wrap_keyed_redirect($profile['idp_url'], $keys);
}
/**
* Allow a user to perform a static logout
* @global array $profile
*/
function logout_mode () {
global $profile;
user_session();
if (! $profile['authorized'])
wrap_html('You were not logged in');
$_SESSION = array();
session_destroy();
debug('User session destroyed.');
header('HTTP/1.0 401 Unauthorized');
wrap_redirect($profile['idp_url']);
}
/**
* The default information screen
* @global array $profile
*/
function no_mode () {
global $profile;
wrap_html('This is an OpenID server endpoint. For more information, see http://openid.net/<br/>Server: <b>' . $profile['idp_url'] . '</b><br/>Realm: <b>' . $profile['php_realm'] . '</b><br/><a href="' . $profile['idp_url'] . (strpos($profile['idp_url'], '?') ? '&' : '?') . 'openid.mode=login&u='.$_GET["u"].'">Login</a>' . ($profile['allow_test'] === true ? ' | <a href="' . $profile['idp_url'] . '&openid.mode=test">Test</a>' : null));
}
/**
* Testing for setup
* @global array $profile
*/
function test_mode () {
global $profile, $p, $g;
if ($profile['allow_test'] != true)
error_403();
@ini_set('max_execution_time', 180);
$test_expire = time() + 120;
$test_ss_enc = 'W7hvmld2yEYdDb0fHfSkKhQX+PM=';
$test_ss = base64_decode($test_ss_enc);
$test_token = "alpha:bravo\ncharlie:delta\necho:foxtrot";
$test_server_private = '11263846781670293092494395517924811173145217135753406847875706165886322533899689335716152496005807017390233667003995430954419468996805220211293016296351031812246187748601293733816011832462964410766956326501185504714561648498549481477143603650090931135412673422192550825523386522507656442905243832471167330268';
$test_client_public = base64_decode('AL63zqI5a5p8HdXZF5hFu8p+P9GOb816HcHuvNOhqrgkKdA3fO4XEzmldlb37nv3+xqMBgWj6gxT7vfuFerEZLBvuWyVvR7IOGZmx0BAByoq3fxYd3Fpe2Coxngs015vK37otmH8e83YyyGo5Qua/NAf13yz1PVuJ5Ctk7E+YdVc');
$res = array();
// bcmath
$res['bcmath'] = extension_loaded('bcmath')
? 'pass' : 'warn - not loaded';
// gmp
if ($profile['allow_gmp']) {
$res['gmp'] = extension_loaded('gmp')
? 'pass' : 'warn - not loaded';
} else {
$res['gmp'] = 'pass - n/a';
}
// sys_get_temp_dir
$res['logfile'] = is_writable($profile['logfile'])
? 'pass' : "warn - log is not writable";
// session & new_assoc
user_session();
list($test_assoc, $test_new_ss) = new_assoc($test_expire);
$res['session'] = ($test_assoc != session_id())
? 'pass' : 'fail';
// secret
@session_unregister('shared_secret');
list($check, $check2) = secret($test_assoc);
$res['secret'] = ($check == $test_new_ss)
? 'pass' : 'fail';
// expire
$res['expire'] = ($check2 <= $test_expire)
? 'pass' : 'fail';
// base64
$res['base64'] = (base64_encode($test_ss) == $test_ss_enc)
? 'pass' : 'fail';
// hmac
$test_sig = base64_decode('/VXgHvZAOdoz/OTa5+XJXzSGhjs=');
$check = hmac($test_ss, $test_token);
$res['hmac'] = ($check == $test_sig)
? 'pass' : sprintf("fail - '%s'", base64_encode($check));
if ($profile['use_bigmath']) {
// bigmath powmod
$test_server_public = '102773334773637418574009974502372885384288396853657336911033649141556441102566075470916498748591002884433213640712303846640842555822818660704173387461364443541327856226098159843042567251113889701110175072389560896826887426539315893475252988846151505416694218615764823146765717947374855806613410142231092856731';
$check = bmpowmod($g, $test_server_private, $p);
$res['bmpowmod-1'] = ($check == $test_server_public)
? 'pass' : sprintf("fail - '%s'", $check);
// long
$test_client_long = '133926731803116519408547886573524294471756220428015419404483437186057383311250738749035616354107518232016420809434801736658109316293127101479053449990587221774635063166689561125137927607200322073086097478667514042144489248048756916881344442393090205172004842481037581607299263456852036730858519133859409417564';
$res['long'] = (long($test_client_public) == $test_client_long)
? 'pass' : 'fail';
// bigmath powmod 2
$test_client_share = '19333275433742428703546496981182797556056709274486796259858099992516081822015362253491867310832140733686713353304595602619444380387600756677924791671971324290032515367930532292542300647858206600215875069588627551090223949962823532134061941805446571307168890255137575975911397744471376862555181588554632928402';
$check = bmpowmod($test_client_long, $test_server_private, $p);
$res['bmpowmod-2'] = ($check == $test_client_share)
? 'pass' : sprintf("fail - '%s'", $check);
// bin
$test_client_mac_s1 = base64_decode('G4gQQkYM6QmAzhKbVKSBahFesPL0nL3F2MREVwEtnVRRYI0ifl9zmPklwTcvURt3QTiGBd+9Dn3ESLk5qka6IO5xnILcIoBT8nnGVPiOZvTygfuzKp4tQ2mXuIATJoa7oXRGmBWtlSdFapH5Zt6NJj4B83XF/jzZiRwdYuK4HJI=');
$check = bin($test_client_share);
$res['bin'] = ($check == $test_client_mac_s1)
? 'pass' : sprintf("fail - '%s'", base64_encode($check));
} else {
$res['bigmath'] = 'fail - big math functions are not available.';
}
// sha1_20
$test_client_mac_s1 = base64_decode('G4gQQkYM6QmAzhKbVKSBahFesPL0nL3F2MREVwEtnVRRYI0ifl9zmPklwTcvURt3QTiGBd+9Dn3ESLk5qka6IO5xnILcIoBT8nnGVPiOZvTygfuzKp4tQ2mXuIATJoa7oXRGmBWtlSdFapH5Zt6NJj4B83XF/jzZiRwdYuK4HJI=');
$test_client_mac_s2 = base64_decode('0Mb2t9d/HvAZyuhbARJPYdx3+v4=');
$check = sha1_20($test_client_mac_s1);
$res['sha1_20'] = ($check == $test_client_mac_s2)
? 'pass' : sprintf("fail - '%s'", base64_encode($check));
// x_or
$test_client_mac_s3 = base64_decode('i36ZLYAJ1rYEx1VEHObrS8hgAg0=');
$check = x_or($test_client_mac_s2, $test_ss);
$res['x_or'] = ($check == $test_client_mac_s3)
? 'pass' : sprintf("fail - '%s'", base64_encode($check));
$out = "<table border=1 cellpadding=4>\n";
foreach ($res as $test => $stat) {
$code = substr($stat, 0, 4);
$color = ($code == 'pass') ? '#9f9'
: (($code == 'warn') ? '#ff9' : '#f99');
$out .= sprintf("<tr><th>%s</th><td style='background:%s'>%s</td></tr>\n", $test, $color, $stat);
}
$out .= "</table>";
wrap_html( $out );
}
// Support functions
/**
* Prefix the keys of an array with 'openid.'
* @param array $array
* @return array
*/
function append_openid ($array) {
$keys = array_keys($array);
$vals = array_values($array);
$r = array();
for ($i=0; $i<sizeof($keys); $i++)
$r['openid.' . $keys[$i]] = $vals[$i];
return $r;
}
/**
* Create a big math addition function
* @param string $l
* @param string $r
* @return string
* @url http://www.icosaedro.it/bigint Inspired by
*/
function bmadd($l, $r) {
if (function_exists('bcadd'))
return bcadd($l, $r);
global $profile;
if ($profile['use_gmp'])
return gmp_strval(gmp_add($l, $r));
$l = strval($l); $r = strval($r);
$ll = strlen($l); $rl = strlen($r);
if ($ll < $rl) {
$l = str_repeat("0", $rl-$ll) . $l;
$o = $rl;
} elseif ( $ll > $rl ) {
$r = str_repeat("0", $ll-$rl) . $r;
$o = $ll;
} else {
$o = $ll;
}
$v = '';
$carry = 0;
for ($i = $o-1; $i >= 0; $i--) {
$d = (int)$l[$i] + (int)$r[$i] + $carry;
if ($d <= 9) {
$carry = 0;
} else {
$carry = 1;
$d -= 10;
}
$v = (string) $d . $v;
}
if ($carry > 0)
$v = "1" . $v;
return $v;
}
/**
* Create a big math comparison function
* @param string $l
* @param string $r
* @return string
*/
function bmcomp($l, $r) {
if (function_exists('bccomp'))
return bccomp($l, $r);
global $profile;
if ($profile['use_gmp'])
return gmp_strval(gmp_cmp($l, $r));
$l = strval($l); $r = strval($r);
$ll = strlen($l); $lr = strlen($r);
if ($ll != $lr)
return ($ll > $lr) ? 1 : -1;
return strcmp($l, $r);
}
/**
* Create a big math division function
* @param string $l
* @param string $r
* @param int $z
* @return string
* @url http://www.icosaedro.it/bigint Inspired by
*/
function bmdiv($l, $r, $z = 0) {
if (function_exists('bcdiv'))
return ($z == 0) ? bcdiv($l, $r) : bcmod($l, $r);
global $profile;
if ($profile['use_gmp'])
return gmp_strval(($z == 0) ? gmp_div_q($l, $r) : gmp_mod($l, $r));
$l = strval($l); $r = strval($r);
$v = '0';
while (true) {
if( bmcomp($l, $r) < 0 )
break;
$delta = strlen($l) - strlen($r);
if ($delta >= 1) {
$zeroes = str_repeat("0", $delta);
$r2 = $r . $zeroes;
if (strcmp($l, $r2) >= 0) {
$v = bmadd($v, "1" . $zeroes);
$l = bmsub($l, $r2);
} else {
$zeroes = str_repeat("0", $delta - 1);
$v = bmadd($v, "1" . $zeroes);
$l = bmsub($l, $r . $zeroes);
}
} else {
$l = bmsub($l, $r);
$v = bmadd($v, "1");
}
}
return ($z == 0) ? $v : $l;
}
/**
* Create a big math multiplication function
* @param string $l
* @param string $r
* @return string
* @url http://www.icosaedro.it/bigint Inspired by
*/
function bmmul($l, $r) {
if (function_exists('bcmul'))
return bcmul($l, $r);
global $profile;
if ($profile['use_gmp'])
return gmp_strval(gmp_mul($l, $r));
$l = strval($l); $r = strval($r);
$v = '0';
$z = '';
for( $i = strlen($r)-1; $i >= 0; $i-- ){
$bd = (int) $r[$i];
$carry = 0;
$p = "";
for( $j = strlen($l)-1; $j >= 0; $j-- ){
$ad = (int) $l[$j];
$pd = $ad * $bd + $carry;
if( $pd <= 9 ){
$carry = 0;
} else {
$carry = (int) ($pd / 10);
$pd = $pd % 10;
}
$p = (string) $pd . $p;
}
if( $carry > 0 )
$p = (string) $carry . $p;
$p = $p . $z;
$z .= "0";
$v = bmadd($v, $p);
}
return $v;
}
/**
* Create a big math modulus function
* @param string $value
* @param string $mod
* @return string
*/
function bmmod( $value, $mod ) {
if (function_exists('bcmod'))
return bcmod($value, $mod);
global $profile;
if ($profile['use_gmp'])
return gmp_strval(gmp_mod($value, $mod));
$r = bmdiv($value, $mod, 1);
return $r;
}
/**
* Create a big math power function
* @param string $value
* @param string $exponent
* @return string
*/
function bmpow ($value, $exponent) {
if (function_exists('bcpow'))
return bcpow($value, $exponent);
global $profile;
if ($profile['use_gmp'])
return gmp_strval(gmp_pow($value, $exponent));
$r = '1';
while ($exponent) {
$r = bmmul($r, $value, 100);
$exponent--;
}
return (string)rtrim($r, '0.');
}
/**
* Create a big math 'powmod' function
* @param string $value
* @param string $exponent
* @param string $mod
* @return string
* @url http://php.net/manual/en/function.bcpowmod.php#72704 Borrowed from
*/
function bmpowmod ($value, $exponent, $mod) {
if (function_exists('bcpowmod'))
return bcpowmod($value, $exponent, $mod);
global $profile;
if ($profile['use_gmp'])
return gmp_strval(gmp_powm($value, $exponent, $mod));
$r = '';
while ($exponent != '0') {
$t = bmmod($exponent, '4096');
$r = substr("000000000000" . decbin(intval($t)), -12) . $r;
$exponent = bmdiv($exponent, '4096');
}
$r = preg_replace("!^0+!","",$r);
if ($r == '')
$r = '0';
$value = bmmod($value, $mod);
$erb = strrev($r);
$q = '1';
$a[0] = $value;
for ($i = 1; $i < strlen($erb); $i++) {
$a[$i] = bmmod( bmmul($a[$i-1], $a[$i-1]), $mod );
}
for ($i = 0; $i < strlen($erb); $i++) {
if ($erb[$i] == "1") {
$q = bmmod( bmmul($q, $a[$i]), $mod );
}
}
return($q);
}
/**
* Create a big math subtraction function
* @param string $l
* @param string $r
* @return string
* @url http://www.icosaedro.it/bigint Inspired by
*/
function bmsub($l, $r) {
if (function_exists('bcsub'))
return bcsub($l, $r);
global $profile;