diff --git a/apps/user_openid/appinfo/app.php b/apps/user_openid/appinfo/app.php
new file mode 100644
index 0000000000..fb3de10e2a
--- /dev/null
+++ b/apps/user_openid/appinfo/app.php
@@ -0,0 +1,38 @@
+<?php
+
+require_once 'apps/user_openid/user_openid.php';
+
+OC_APP::addSettingsPage( array( "id" => "user_openid_settings", 'order'=>1, "href" => OC_HELPER::linkTo( "user_openid", "settings.php" ), "name" => "OpenID"));
+
+//active the openid backend
+OC_USER::useBackend('openid');
+
+//check for results from openid requests
+if(isset($_GET['openid_mode']) and $_GET['openid_mode'] == 'id_res'){
+	error_log('openid retured');
+	$openid = new SimpleOpenID;
+	$openid->SetIdentity($_GET['openid_identity']);
+	$openid_validation_result = $openid->ValidateWithServer();
+	if ($openid_validation_result == true){         // OK HERE KEY IS VALID
+		error_log('auth sucessfull');
+		global $WEBROOT;
+		$identity=$openid->GetIdentity();
+		error_log("auth as $identity");
+		$user=OC_USER_OPENID::findUserForIdentity($identity);
+		if($user){
+			$_SESSION['user_id']=$user;
+			header("Location: $WEBROOT");
+		}
+	}else if($openid->IsError() == true){            // ON THE WAY, WE GOT SOME ERROR
+		$error = $openid->GetError();
+		error_log("ERROR CODE: " . $error['code']);
+		error_log("ERROR DESCRIPTION: " . $error['description']);
+	}else{                                            // Signature Verification Failed
+		error_log("INVALID AUTHORIZATION");
+	}
+}else if (isset($_GET['openid_mode']) and $_GET['openid_mode'] == 'cancel'){ // User Canceled your Request
+	error_log("USER CANCELED REQUEST");
+	return false;
+}
+
+?>
diff --git a/apps/user_openid/appinfo/info.xml b/apps/user_openid/appinfo/info.xml
new file mode 100644
index 0000000000..32525009d6
--- /dev/null
+++ b/apps/user_openid/appinfo/info.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0"?>
+<info>
+	<id>user_openid</id>
+	<name>OpenID user backend</name>
+	<description>Allow login through OpenID</description>
+	<version>0.1</version>
+	<licence>AGPL</licence>
+	<author>Robin Appelman</author>
+	<require>2</require>
+</info>
\ No newline at end of file
diff --git a/apps/user_openid/class.openid.v3.php b/apps/user_openid/class.openid.v3.php
new file mode 100644
index 0000000000..8afb9e5b81
--- /dev/null
+++ b/apps/user_openid/class.openid.v3.php
@@ -0,0 +1,328 @@
+<?php
+/*
+	FREE TO USE
+        Under License: GPLv3
+	Simple OpenID PHP Class
+	
+	Some modifications by Eddie Roosenmaallen, eddie@roosenmaallen.com
+	
+-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
+
+This Class was written to make easy for you to integrate OpenID on your website. 
+This is just a client, which checks for user's identity. This Class Requires CURL Module.
+It should be easy to use some other HTTP Request Method, but remember, often OpenID servers
+are using SSL.
+We need to be able to perform SSL Verification on the background to check for valid signature.
+
+HOW TO USE THIS CLASS:
+  STEP 1)
+	$openid = new SimpleOpenID;
+	:: SET IDENTITY ::
+		$openid->SetIdentity($_POST['openid_url']);
+	:: SET RETURN URL ::
+		$openid->SetApprovedURL('http://www.yoursite.com/return.php'); // Script which handles a response from OpenID Server
+	:: SET TRUST ROOT ::
+		$openid->SetTrustRoot('http://www.yoursite.com/');
+	:: FETCH SERVER URL FROM IDENTITY PAGE ::  [Note: It is recomended to cache this (Session, Cookie, Database)]
+		$openid->GetOpenIDServer(); // Returns false if server is not found
+	:: REDIRECT USER TO OPEN ID SERVER FOR APPROVAL ::
+	
+	:: (OPTIONAL) SET OPENID SERVER ::
+		$openid->SetOpenIDServer($server_url); // If you have cached previously this, you don't have to call GetOpenIDServer and set value this directly
+		
+	STEP 2)
+	Once user gets returned we must validate signature
+	:: VALIDATE REQUEST ::
+		true|false = $openid->ValidateWithServer();
+		
+	ERRORS:
+		array = $openid->GetError(); 	// Get latest Error code
+	
+	FIELDS:
+		OpenID allowes you to retreive a profile. To set what fields you'd like to get use (accepts either string or array):
+		$openid->SetRequiredFields(array('email','fullname','dob','gender','postcode','country','language','timezone'));
+		 or
+		$openid->SetOptionalFields('postcode');
+		
+IMPORTANT TIPS:
+OPENID as is now, is not trust system. It is a great single-sign on method. If you want to 
+store information about OpenID in your database for later use, make sure you handle url identities
+properly.
+  For example:
+	https://steve.myopenid.com/
+	https://steve.myopenid.com
+	http://steve.myopenid.com/
+	http://steve.myopenid.com
+	... are representing one single user. Some OpenIDs can be in format openidserver.com/users/user/ - keep this in mind when storing identities
+
+	To help you store an OpenID in your DB, you can use function:
+		$openid_db_safe = $openid->OpenID_Standarize($upenid);
+	This may not be comatible with current specs, but it works in current enviroment. Use this function to get openid
+	in one format like steve.myopenid.com (without trailing slashes and http/https).
+	Use output to insert Identity to database. Don't use this for validation - it may fail.
+
+*/
+
+class SimpleOpenID{
+	var $openid_url_identity;
+	var $URLs = array();
+	var $error = array();
+	var $fields = array(
+		'required'	 => array(),
+		'optional'	 => array(),
+	);
+	
+	function SimpleOpenID(){
+		if (!function_exists('curl_exec')) {
+			die('Error: Class SimpleOpenID requires curl extension to work');
+		}
+	}
+	function SetOpenIDServer($a){
+		$this->URLs['openid_server'] = $a;
+	}
+	function SetTrustRoot($a){
+		$this->URLs['trust_root'] = $a;
+	}
+	function SetCancelURL($a){
+		$this->URLs['cancel'] = $a;
+	}
+	function SetApprovedURL($a){
+		$this->URLs['approved'] = $a;
+	}
+	function SetRequiredFields($a){
+		if (is_array($a)){
+			$this->fields['required'] = $a;
+		}else{
+			$this->fields['required'][] = $a;
+		}
+	}
+	function SetOptionalFields($a){
+		if (is_array($a)){
+			$this->fields['optional'] = $a;
+		}else{
+			$this->fields['optional'][] = $a;
+		}
+	}
+	function SetIdentity($a){ 	// Set Identity URL
+ 			if ((stripos($a, 'http://') === false)
+ 			   && (stripos($a, 'https://') === false)){
+		 		$a = 'http://'.$a;
+		 	}
+/*
+			$u = parse_url(trim($a));
+			if (!isset($u['path'])){
+				$u['path'] = '/';
+			}else if(substr($u['path'],-1,1) == '/'){
+				$u['path'] = substr($u['path'], 0, strlen($u['path'])-1);
+			}
+			if (isset($u['query'])){ // If there is a query string, then use identity as is
+				$identity = $a;
+			}else{
+				$identity = $u['scheme'] . '://' . $u['host'] . $u['path'];
+			}
+//*/
+			$this->openid_url_identity = $a;
+	}
+	function GetIdentity(){ 	// Get Identity
+		return $this->openid_url_identity;
+	}
+	function GetError(){
+		$e = $this->error;
+		return array('code'=>$e[0],'description'=>$e[1]);
+	}
+
+	function ErrorStore($code, $desc = null){
+		$errs['OPENID_NOSERVERSFOUND'] = 'Cannot find OpenID Server TAG on Identity page.';
+		if ($desc == null){
+			$desc = $errs[$code];
+		}
+	   	$this->error = array($code,$desc);
+	}
+
+	function IsError(){
+		if (count($this->error) > 0){
+			return true;
+		}else{
+			return false;
+		}
+	}
+	
+	function splitResponse($response) {
+		$r = array();
+		$response = explode("\n", $response);
+		foreach($response as $line) {
+			$line = trim($line);
+			if ($line != "") {
+				list($key, $value) = explode(":", $line, 2);
+				$r[trim($key)] = trim($value);
+			}
+		}
+	 	return $r;
+	}
+	
+	function OpenID_Standarize($openid_identity = null){
+		if ($openid_identity === null)
+			$openid_identity = $this->openid_url_identity;
+
+		$u = parse_url(strtolower(trim($openid_identity)));
+		
+		if (!isset($u['path']) || ($u['path'] == '/')) {
+			$u['path'] = '';
+		}
+		if(substr($u['path'],-1,1) == '/'){
+			$u['path'] = substr($u['path'], 0, strlen($u['path'])-1);
+		}
+		if (isset($u['query'])){ // If there is a query string, then use identity as is
+			return $u['host'] . $u['path'] . '?' . $u['query'];
+		}else{
+			return $u['host'] . $u['path'];
+		}
+	}
+	
+	function array2url($arr){ // converts associated array to URL Query String
+		if (!is_array($arr)){
+			return false;
+		}
+		$query = '';
+		foreach($arr as $key => $value){
+			$query .= $key . "=" . $value . "&";
+		}
+		return $query;
+	}
+	function FSOCK_Request($url, $method="GET", $params = ""){
+		$fp = fsockopen("ssl://www.myopenid.com", 443, $errno, $errstr, 3); // Connection timeout is 3 seconds
+		if (!$fp) {
+			$this->ErrorStore('OPENID_SOCKETERROR', $errstr);
+		   	return false;
+		} else {
+			$request = $method . " /server HTTP/1.0\r\n";
+			$request .= "User-Agent: Simple OpenID PHP Class (http://www.phpclasses.org/simple_openid)\r\n";
+			$request .= "Connection: close\r\n\r\n";
+		   	fwrite($fp, $request);
+		   	stream_set_timeout($fp, 4); // Connection response timeout is 4 seconds
+		   	$res = fread($fp, 2000);
+		   	$info = stream_get_meta_data($fp);
+		   	fclose($fp);
+		
+		   	if ($info['timed_out']) {
+		       $this->ErrorStore('OPENID_SOCKETTIMEOUT');
+		   	} else {
+		      	return $res;
+		   	}
+		}
+	}
+	function CURL_Request($url, $method="GET", $params = "") { // Remember, SSL MUST BE SUPPORTED
+			if (is_array($params)) $params = $this->array2url($params);
+			$curl = curl_init($url . ($method == "GET" && $params != "" ? "?" . $params : ""));
+			curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
+			curl_setopt($curl, CURLOPT_HEADER, false);
+			curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
+			curl_setopt($curl, CURLOPT_HTTPGET, ($method == "GET"));
+			curl_setopt($curl, CURLOPT_POST, ($method == "POST"));
+			if ($method == "POST") curl_setopt($curl, CURLOPT_POSTFIELDS, $params);
+			curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
+			$response = curl_exec($curl);
+			
+			if (curl_errno($curl) == 0){
+				$response;
+			}else{
+				$this->ErrorStore('OPENID_CURL', curl_error($curl));
+			}
+			return $response;
+	}
+	
+	 function HTML2OpenIDServer($content) {
+		$get = array();
+		
+		// Get details of their OpenID server and (optional) delegate
+		preg_match_all('/<link[^>]*rel=[\'"](openid2.provider )?openid.server[\'"][^>]*href=[\'"]([^\'"]+)[\'"][^>]*\/?>/i', $content, $matches1);
+		preg_match_all('/<link[^>]*href=\'"([^\'"]+)[\'"][^>]*rel=[\'"](openid2.provider )?openid.server[\'"][^>]*\/?>/i', $content, $matches2);
+		$servers = array_merge($matches1[2], $matches2[1]);
+		
+		preg_match_all('/<link[^>]*rel=[\'"]openid.delegate[\'"][^>]*href=[\'"]([^\'"]+)[\'"][^>]*\/?>/i', $content, $matches1);
+		
+		preg_match_all('/<link[^>]*href=[\'"]([^\'"]+)[\'"][^>]*rel=[\'"]openid.delegate[\'"][^>]*\/?>/i', $content, $matches2);
+		
+		$delegates = array_merge($matches1[1], $matches2[1]);
+		
+		$ret = array($servers, $delegates);
+		return $ret;
+	}
+	
+	function GetOpenIDServer(){
+		$response = $this->CURL_Request($this->openid_url_identity);
+		list($servers, $delegates) = $this->HTML2OpenIDServer($response);
+		if (count($servers) == 0){
+			$this->ErrorStore('OPENID_NOSERVERSFOUND');
+			return false;
+		}
+		if (isset($delegates[0])
+		  && ($delegates[0] != "")){
+			$this->SetIdentity($delegates[0]);
+		}
+		$this->SetOpenIDServer($servers[0]);
+		return $servers[0];
+	}
+	
+	function GetRedirectURL(){
+		$params = array();
+		$params['openid.return_to'] = urlencode($this->URLs['approved']);
+		$params['openid.mode'] = 'checkid_setup';
+		$params['openid.identity'] = urlencode($this->openid_url_identity);
+		$params['openid.trust_root'] = urlencode($this->URLs['trust_root']);
+		
+		if (isset($this->fields['required'])
+		  && (count($this->fields['required']) > 0)) {
+			$params['openid.sreg.required'] = implode(',',$this->fields['required']);
+		}
+		if (isset($this->fields['optional'])
+		  && (count($this->fields['optional']) > 0)) {
+			$params['openid.sreg.optional'] = implode(',',$this->fields['optional']);
+		}
+		return $this->URLs['openid_server'] . "?". $this->array2url($params);
+	}
+	
+	function Redirect(){
+		$redirect_to = $this->GetRedirectURL();
+		if (headers_sent()){ // Use JavaScript to redirect if content has been previously sent (not recommended, but safe)
+			echo '<script language="JavaScript" type="text/javascript">window.location=\'';
+			echo $redirect_to;
+			echo '\';</script>';
+		}else{	// Default Header Redirect
+			header('Location: ' . $redirect_to);
+		}
+	}
+	
+	function ValidateWithServer(){
+		$params = array(
+			'openid.assoc_handle' => urlencode($_GET['openid_assoc_handle']),
+			'openid.signed' => urlencode($_GET['openid_signed']),
+			'openid.sig' => urlencode($_GET['openid_sig'])
+		);
+		// Send only required parameters to confirm validity
+		$arr_signed = explode(",",str_replace('sreg.','sreg_',$_GET['openid_signed']));
+		for ($i=0; $i<count($arr_signed); $i++){
+			$s = str_replace('sreg_','sreg.', $arr_signed[$i]);
+			$c = $_GET['openid_' . $arr_signed[$i]];
+			// if ($c != ""){
+				$params['openid.' . $s] = urlencode($c);
+			// }
+		}
+		$params['openid.mode'] = "check_authentication";
+
+		$openid_server = $this->GetOpenIDServer();
+		if ($openid_server == false){
+			return false;
+		}
+		$response = $this->CURL_Request($openid_server,'POST',$params);
+		$data = $this->splitResponse($response);
+
+		if ($data['is_valid'] == "true") {
+			return true;
+		}else{
+			return false;
+		}
+	}
+}
+
+?>
\ No newline at end of file
diff --git a/apps/user_openid/phpmyid.php b/apps/user_openid/phpmyid.php
new file mode 100644
index 0000000000..719bbd954c
--- /dev/null
+++ b/apps/user_openid/phpmyid.php
@@ -0,0 +1,1723 @@
+<?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
+ */
+
+
+/**
+ * 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';
+
+
+// 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('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;
+	global $USERNAME;
+
+	// this is a user session
+
+	// the user needs refresh urls in their session to access this mode
+	if (! isset($_SESSION['post_auth_url']) || ! isset($_SESSION['cancel_auth_url']))
+		error_500('You may not access this mode directly.');
+		
+	if (isset($_SERVER['PHP_AUTH_USER']) && $profile['authorized'] === false && $_SERVER['PHP_AUTH_USER']==$USERNAME) {
+		if (OC_USER::checkPassword($USERNAME, $_SERVER['PHP_AUTH_PW'])) {// successful login!
+
+			// return to the refresh url if they get in
+			$_SESSION['openid_auth']=true;
+			$_SESSION['openid_user']=$USERNAME;
+			wrap_redirect($_SESSION['post_auth_url']);
+
+		// failed login
+		} else {
+			$_SESSION['failures']++;
+			debug('Login failed');
+			debug('Fail count: ' . $_SESSION['failures']);
+		}
+
+	}
+
+	// if we get this far the user is not authorized, so send the headers
+	$uid = uniqid(mt_rand(1,9));
+	$_SESSION['uniqid'] = $uid;
+
+// 	debug('Prompting user to log in. Stale? ' . $stale);
+	header('HTTP/1.0 401 Unauthorized');
+// 	header(sprintf('WWW-Authenticate: Digest qop="auth-int, auth", realm="%s", domain="%s", nonce="%s", opaque="%s", stale="%s", algorithm="MD5"', $profile['auth_realm'], $profile['auth_domain'], $uid, md5($profile['auth_realm']), $stale ? 'true' : 'false'));
+	header('WWW-Authenticate: Basic realm="ownCloud"');
+	$q = strpos($_SESSION['cancel_auth_url'], '?') ? '&' : '?';
+	wrap_refresh($_SESSION['cancel_auth_url'] . $q . 'openid.mode=cancel');
+// 	die('401 Unauthorized');
+}
+
+
+/**
+ *  Handle a consumer's request for cancellation.
+ */
+function cancel_mode () {
+	wrap_html('Request cancelled.');
+}
+
+
+/**
+ * Handle a consumer's request to see if the user is authenticated
+ */
+function check_authentication_mode () {
+	// Validate the request
+	if (! isset($_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 ) {
+	global $known, $profile, $sreg;
+	global $USERNAME;
+
+	// 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 return1_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'] . $q . 'openid.mode=accept');
+	}
+	
+	// make sure i am this identifier
+	if ($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
+	$keys = array(
+		'mode' => 'id_res'
+	);
+
+	// if the user is not logged in, transfer to the authorization mode
+	if ($_SESSION['openid_auth'] === false || $USERNAME != $_SESSION['openid_user']) {
+		// users can only be logged in to one url at a time
+		$_SESSION['auth_username'] = null;
+		$_SESSION['auth_url'] = null;
+
+		if ($wait) {
+			unset($_SESSION['uniqid']);
+
+			$_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');
+}
+
+
+/**
+ * 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="' . $profile['idp_url'] . '?openid.mode=login">Login</a>' . ($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 $profile;
+	if ($profile['use_gmp'])
+		return gmp_strval(gmp_sub($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) . (string)$r;
+		$o = $ll;
+	} else {
+		$o = $ll;
+	}
+
+	if (strcmp($l, $r) >= 0) {
+		$sign = '';
+	} else {
+		$x = $l; $l = $r; $r = $x;
+		$sign = '-';
+	}
+
+	$v = '';
+	$carry = 0;
+
+	for ($i = $o-1; $i >= 0; $i--) {
+		$d = ($l[$i] - $r[$i]) - $carry;
+		if ($d < 0) {
+			$carry = 1;
+			$d += 10;
+		} else {
+			$carry = 0;
+		}
+		$v = (string) $d . $v;
+	}
+
+	return $sign . ltrim($v, '0');
+}
+
+
+/**
+ * Get a binary value
+ * @param integer $n
+ * @return string
+ * @url http://openidenabled.com Borrowed from PHP-OpenID
+ */
+function bin ($n) {
+	$bytes = array();
+	while (bmcomp($n, 0) > 0) {
+		array_unshift($bytes, bmmod($n, 256));
+		$n = bmdiv($n, bmpow(2,8));
+	}
+
+	if ($bytes && ($bytes[0] > 127))
+		array_unshift($bytes, 0);
+
+	$b = '';
+	foreach ($bytes as $byte)
+		$b .= pack('C', $byte);
+
+	return $b;
+}
+
+
+/**
+ * Debug logging
+ * @param mixed $x
+ * @param string $m 
+ */
+function debug ($x, $m = null) {
+	global $profile;
+
+	if (! isset($profile['debug']) || $profile['debug'] === false)
+		return true;
+
+	if (! is_writable(dirname($profile['logfile'])) &! is_writable($profile['logfile']))
+		error_500('Cannot write to debug log: ' . $profile['logfile']);
+
+	if (is_array($x)) {
+		ob_start();
+		print_r($x);
+		$x = $m . ($m != null ? "\n" : '') . ob_get_clean();
+
+	} else {
+		$x .= "\n";
+	}
+
+	error_log($x . "\n", 3, $profile['logfile']);
+}
+
+
+/**
+ * Destroy a consumer's assoc handle
+ * @param string $id
+ */
+function destroy_assoc_handle ( $id ) {
+	debug("Destroying session: $id");
+
+	$sid = session_id();
+	session_write_close();
+
+	session_id($id);
+	session_start();
+	session_destroy();
+
+	session_id($sid);
+	session_start();
+}
+
+
+/**
+ * Return an error message to the user
+ * @param string $message
+ */
+function error_400 ( $message = 'Bad Request' ) {
+	header("HTTP/1.1 400 Bad Request");
+	wrap_html($message);
+}
+
+
+/**
+ * Return an error message to the user
+ * @param string $message
+ */
+function error_403 ( $message = 'Forbidden' ) {
+	header("HTTP/1.1 403 Forbidden");
+	wrap_html($message);
+}
+
+
+/**
+ * Return an error message to the user
+ * @param string $message
+ */
+function error_500 ( $message = 'Internal Server Error' ) {
+	header("HTTP/1.1 500 Internal Server Error");
+	wrap_html($message);
+}
+
+
+/**
+ * Return an error message to the consumer
+ * @param string $message
+ */
+function error_get ( $url, $message = 'Bad Request') {
+	wrap_keyed_redirect($url, array('mode' => 'error', 'error' => $message));
+}
+
+
+/**
+ * Return an error message to the consumer
+ * @param string $message
+ */
+function error_post ( $message = 'Bad Request' ) {
+	header("HTTP/1.1 400 Bad Request");
+	echo ('error:' . $message);
+	exit(0);
+}
+
+
+/**
+ * Do an HMAC
+ * @param string $key
+ * @param string $data
+ * @param string $hash
+ * @return string
+ * @url http://php.net/manual/en/function.sha1.php#39492 Borrowed from
+ */
+function hmac($key, $data, $hash = 'sha1_20') {
+	$blocksize=64;
+
+	if (strlen($key) > $blocksize)
+		$key = $hash($key);
+
+	$key = str_pad($key, $blocksize,chr(0x00));
+	$ipad = str_repeat(chr(0x36),$blocksize);
+	$opad = str_repeat(chr(0x5c),$blocksize);
+
+	$h1 = $hash(($key ^ $ipad) . $data);
+	$hmac = $hash(($key ^ $opad) . $h1);
+	return $hmac;
+}
+
+
+if (! function_exists('http_build_query')) {
+/**
+ * Create function if missing
+ * @param array $array
+ * @return string
+ */
+function http_build_query ($array) {
+	$r = array();
+	foreach ($array as $key => $val)
+		$r[] = sprintf('%s=%s', urlencode($key), urlencode($val));
+	return implode('&', $r);
+}}
+
+
+/**
+ * Turn a binary back into a long
+ * @param string $b
+ * @return integer
+ * @url http://openidenabled.com Borrowed from PHP-OpenID
+ */
+function long($b) {
+	$bytes = array_merge(unpack('C*', $b));
+	$n = 0;
+	foreach ($bytes as $byte) {
+		$n = bmmul($n, bmpow(2,8));
+		$n = bmadd($n, $byte);
+	}
+	return $n;
+}
+
+
+/**
+ * Create a new consumer association
+ * @param integer $expiration
+ * @return array
+ */
+function new_assoc ( $expiration ) {
+	if (isset($_SESSION) && is_array($_SESSION)) {
+		$sid = session_id();
+		$dat = session_encode();
+		session_write_close();
+	}
+
+	session_start();
+	session_regenerate_id('false');
+
+	$id = session_id();
+	$shared_secret = new_secret();
+	debug('Started new assoc session: ' . $id);
+
+	$_SESSION = array();
+	$_SESSION['expiration'] = $expiration;
+	$_SESSION['shared_secret'] = base64_encode($shared_secret);
+
+	session_write_close();
+
+	if (isset($sid)) {
+		session_id($sid);
+		session_start();
+		$_SESSION = array();
+		session_decode($dat);
+	}
+
+	return array($id, $shared_secret);
+}
+
+
+/**
+ * Create a new shared secret
+ * @return string
+ */
+function new_secret () {
+	$r = '';
+	for($i=0; $i<20; $i++)
+		$r .= chr(mt_rand(0, 255));
+
+	debug("Generated new key: hash = '" . md5($r) . "', length = '" . strlen($r) . "'");
+	return $r;
+}
+
+
+/**
+ * Random number generation
+ * @param integer max
+ * @return integer
+ */
+function random ( $max ) {
+	if (strlen($max) < 4)
+		return mt_rand(1, $max - 1);
+
+	$r = '';
+	for($i=1; $i<strlen($max) - 1; $i++)
+		$r .= mt_rand(0,9);
+	$r .= mt_rand(1,9);
+
+	return $r;
+}
+
+/**
+ * Get the shared secret and expiration time for the specified assoc_handle
+ * @param string $handle assoc_handle to look up
+ * @return array (shared_secret, expiration_time)
+ */
+function secret ( $handle ) {
+	if (! preg_match('/^\w+$/', $handle))
+		return array(false, 0);
+
+	if (isset($_SESSION) && is_array($_SESSION)) {
+		$sid = session_id();
+		$dat = session_encode();
+		session_write_close();
+	}
+
+	session_id($handle);
+	session_start();
+	debug('Started session to acquire key: ' . session_id());
+
+	$secret = session_is_registered('shared_secret')
+		? base64_decode($_SESSION['shared_secret'])
+		: false;
+
+	$expiration = session_is_registered('expiration')
+		? $_SESSION['expiration']
+		: null;
+
+	session_write_close();
+
+	if (isset($sid)) {
+		session_id($sid);
+		session_start();
+		$_SESSION = array();
+		session_decode($dat);
+	}
+
+	debug("Found key: hash = '" . md5($secret) . "', length = '" . strlen($secret) . "', expiration = '$expiration'");
+	return array($secret, $expiration);
+}
+
+
+/**
+ * Do an internal self check
+ * @global array $profile
+ * @global array $sreg
+ */
+function self_check () {
+	global $profile, $sreg;
+
+// 	if (! isset($profile) || ! is_array($profile))
+// 		error_500('No configuration found, you shouldn\'t access this file directly.');
+
+	if (version_compare(phpversion(), '4.2.0', 'lt'))
+		error_500('The required minimum version of PHP is 4.2.0, you are running ' . phpversion());
+
+	$extension_r = array('session', 'pcre');
+	foreach ($extension_r as $x) {
+		if (! extension_loaded($x))
+			@dl($x);
+		if (! extension_loaded($x))
+			error_500("Required extension '$x' is missing.");
+	}
+
+// 	$extension_b = array('suhosin');
+// 	foreach ($extension_b as $x) {
+// 		if (extension_loaded($x) &! $profile["allow_$x"])
+// 			error_500("phpMyID is not compatible with '$x'");
+// 	}
+// 
+// 	$keys = array('auth_username', 'auth_password');
+// 	foreach ($keys as $key) {
+// 		if (! array_key_exists($key, $profile))
+// 			error_500("'$key' is missing from your profile.");
+// 	}
+
+	if (! isset($sreg) || ! is_array($sreg))
+		$sreg = array();
+}
+
+
+/**
+ * Do SHA1 20 byte encryption
+ * @param string $v
+ * @return string
+ * @url http://openidenabled.com Borrowed from PHP-OpenID
+ */
+function sha1_20 ($v) {
+	if (version_compare(phpversion(), '5.0.0', 'ge'))
+		return sha1($v, true);
+
+	$hex = sha1($v);
+	$r = '';
+	for ($i = 0; $i < 40; $i += 2) {
+		$hexcode = substr($hex, $i, 2);
+		$charcode = base_convert($hexcode, 16, 10);
+		$r .= chr($charcode);
+	}
+	return $r;
+}
+
+
+/**
+ * Look for the point of differentiation in two strings
+ * @param string $a
+ * @param string $b
+ * @return int
+ */
+function str_diff_at ($a, $b) {
+	if ($a == $b)
+		return -1;
+	$n = min(strlen($a), strlen($b));
+	for ($i = 0; $i < $n; $i++)
+		if ($a[$i] != $b[$i])
+			return $i;
+	return $n;
+}
+
+
+if (! function_exists('sys_get_temp_dir') && ini_get('open_basedir') == false) {
+/**
+ * Create function if missing
+ * @return string
+ */
+function sys_get_temp_dir () {
+	$keys = array('TMP', 'TMPDIR', 'TEMP');
+	foreach ($keys as $key) {
+		if (isset($_ENV[$key]) && is_dir($_ENV[$key]) && is_writable($_ENV[$key]))
+			return realpath($_ENV[$key]);
+	}
+
+	$tmp = tempnam(false, null);
+	if (file_exists($tmp)) {
+		$dir = realpath(dirname($tmp));
+		unlink($tmp);
+		return realpath($dir);
+	}
+
+	return realpath(dirname(__FILE__));
+}} elseif (! function_exists('sys_get_temp_dir')) {
+function sys_get_temp_dir () {
+	return realpath(dirname(__FILE__));
+}}
+
+
+/**
+ * Determine if a child URL actually decends from the parent, and that the
+ * parent is a good URL.
+ * THIS IS EXPERIMENTAL
+ * @param string $parent
+ * @param string $child
+ * @return bool
+ */
+function url_descends ( $child, $parent ) {
+	if ($child == $parent)
+		return true;
+
+	$keys = array();
+	$parts = array();
+
+	$req = array('scheme', 'host');
+	$bad = array('fragment', 'pass', 'user');
+
+	foreach (array('parent', 'child') as $name) {
+		$parts[$name] = @parse_url($$name);
+		if ($parts[$name] === false)
+			return false;
+
+		$keys[$name] = array_keys($parts[$name]);
+
+		if (array_intersect($keys[$name], $req) != $req)
+			return false;
+
+		if (array_intersect($keys[$name], $bad) != array())
+			return false;
+
+		if (! preg_match('/^https?$/i', strtolower($parts[$name]['scheme'])))
+			return false;
+
+		if (! array_key_exists('port', $parts[$name]))
+			$parts[$name]['port'] = (strtolower($parts[$name]['scheme']) == 'https') ? 443 : 80;
+
+		if (! array_key_exists('path', $parts[$name]))
+			$parts[$name]['path'] = '/';
+	}
+
+	// port and scheme must match
+	if ($parts['parent']['scheme'] != $parts['child']['scheme'] ||
+	    $parts['parent']['port'] != $parts['child']['port'])
+		return false;
+
+	// compare the hosts by reversing the strings
+	$cr_host = strtolower(strrev($parts['child']['host']));
+	$pr_host = strtolower(strrev($parts['parent']['host']));
+
+	$break = str_diff_at($cr_host, $pr_host);
+	if ($break >= 0 && ($pr_host[$break] != '*' || substr_count(substr($pr_host, 0, $break), '.') < 2))
+		return false;
+
+	// now compare the paths
+	$break = str_diff_at($parts['child']['path'], $parts['parent']['path']);
+	if ($break >= 0
+	   && ($break < strlen($parts['parent']['path']) && $parts['parent']['path'][$break] != '*')
+	   || ($break > strlen($parts['child']['path'])))
+		return false;
+
+	return true;
+}
+
+
+/**
+ * Create a user session
+ * @global array $profile
+ * @global array $proto
+ */
+function user_session () {
+	global $proto, $profile;
+
+	session_name('phpMyID_Server');
+	@session_start();
+
+	$profile['authorized'] = (isset($_SESSION['auth_username'])
+			    && $_SESSION['auth_username'] == $profile['auth_username'])
+			? true
+			: false;
+
+	debug('Started user session: ' . session_id() . ' Auth? ' . $profile['authorized']);
+}
+
+
+/**
+ * Return HTML
+ * @global string $charset
+ * @param string $message
+ */
+function wrap_html ( $message ) {
+	global $charset, $profile;
+	header('Content-Type: text/html; charset=' . $charset);
+	$html= '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html>
+<head>
+<title>phpMyID</title>
+<link rel="openid.server" href="' . $profile['req_url'] . '" />
+<link rel="openid.delegate" href="' . $profile['idp_url'] . '" />
+' . implode("\n", $profile['opt_headers']) . '
+<meta name="charset" content="' . $charset . '" />
+<meta name="robots" content="noindex,nofollow" />
+</head>
+<body>
+<p>' . $message . '</p>
+</body>
+</html>
+';
+	error_log($html);
+	echo $html;
+	exit(0);
+}
+
+
+/**
+ * Return a key-value pair in plain text
+ * @global string $charset
+ * @param array $keys
+ */
+function wrap_kv ( $keys ) {
+	global $charset;
+
+	debug($keys, 'Wrapped key/vals');
+	header('Content-Type: text/plain; charset=' . $charset);
+	foreach ($keys as $key => $value)
+		printf("%s:%s\n", $key, $value);
+
+	exit(0);
+}
+
+
+/**
+ * Redirect, with OpenID keys
+ * @param string $url
+ * @param array @keys
+ */
+function wrap_keyed_redirect ($url, $keys) {
+	$keys = append_openid($keys);
+	debug($keys, 'Location keys');
+
+	$q = strpos($url, '?') ? '&' : '?';
+	wrap_redirect($url . $q . http_build_query($keys));
+}
+
+
+/**
+ * Redirect the browser
+ * @global string $charset
+ * @param string $url
+ */
+function wrap_redirect ($url) {
+	header('HTTP/1.1 302 Found');
+	header('Location: ' . $url);
+	debug('Location: ' . $url);
+	exit(0);
+}
+
+/**
+ * Return an HTML refresh
+ * @global string $charset
+ * @param string $url
+ */
+function wrap_refresh ($url) {
+	global $charset;
+
+	header('Content-Type: text/html; charset=' . $charset);
+	echo '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html>
+<head>
+<title>phpMyID</title>
+<meta http-equiv="refresh" content="0;url=' . $url . '">
+</head>
+<body>
+<p>Redirecting to <a href="' . $url . '">' . $url . '</a></p>
+</body>
+</html>
+';
+
+	debug('Refresh: ' . $url);
+	exit(0);
+}
+
+
+/**
+ * Implement binary x_or
+ * @param string $a
+ * @param string $b
+ * @return string
+ */
+function x_or ($a, $b) {
+	$r = "";
+
+	for ($i = 0; $i < strlen($b); $i++)
+		$r .= $a[$i] ^ $b[$i];
+	debug("Xor size: " . strlen($r));
+	return $r;
+}
+
+
+
+/*
+ * App Initialization
+ */
+// Determine the charset to use
+$GLOBALS['charset'] = 'iso-8859-1';
+
+// Set the internal encoding
+if (function_exists('mb_internal_encoding'))
+	mb_internal_encoding($charset);
+
+// Avoid problems with non-default arg_separator.output settings
+// Credit for this goes to user 'prelog' on the forums
+ini_set('arg_separator.output', '&');
+
+// Do a check to be sure everything is set up correctly
+self_check();
+
+
+/**
+ * Determine the HTTP request port
+ * @name $port
+ * @global integer $GLOBALS['port']
+ */
+$GLOBALS['port'] = ((isset($_SERVER["HTTPS"]) && $_SERVER["HTTPS"] == 'on' && $_SERVER['SERVER_PORT'] == 443)
+	  || $_SERVER['SERVER_PORT'] == 80)
+		? ''
+		: ':' . $_SERVER['SERVER_PORT'];
+
+
+error_log($_SERVER['HTTP_HOST']);
+/**
+ * Determine the HTTP request protocol
+ * @name $proto
+ * @global string $GLOBALS['proto']
+ */
+$GLOBALS['proto'] = (isset($_SERVER["HTTPS"]) && $_SERVER["HTTPS"] == 'on') ? 'https' : 'http';
+
+// Set the authorization state - DO NOT OVERRIDE
+$profile['authorized'] = false;
+
+// Set a default IDP URL
+if (! array_key_exists('idp_url', $profile))
+	$profile['idp_url'] = sprintf("%s://%s%s%s",
+			      $proto,
+			      $_SERVER['SERVER_NAME'],
+			      $port,
+			      $_SERVER['PHP_SELF']);
+
+// Determine the requested URL - DO NOT OVERRIDE
+$profile['req_url'] = sprintf("%s://%s%s",
+		      $proto,
+		      $_SERVER['HTTP_HOST'],
+// 		      $port,//host  already includes the path
+		      $_SERVER["REQUEST_URI"]);
+
+error_log($profile['req_url']);
+
+// Set the default allowance for testing
+if (! array_key_exists('allow_test', $profile))
+	$profile['allow_test'] = false;
+
+// Set the default allowance for gmp
+if (! array_key_exists('allow_gmp', $profile))
+	$profile['allow_gmp'] = false;
+
+// Set the default force bigmath - BAD IDEA to override this
+if (! array_key_exists('force_bigmath', $profile))
+	$profile['force_bigmath'] = false;
+
+// Determine if GMP is usable
+$profile['use_gmp'] = (extension_loaded('gmp') && $profile['allow_gmp']) ? true : false;
+
+// Determine if I can perform big math functions
+$profile['use_bigmath'] = (extension_loaded('bcmath') || $profile['use_gmp'] || $profile['force_bigmath']) ? true : false;
+
+// Set a default authentication domain
+if (! array_key_exists('auth_domain', $profile))
+	$profile['auth_domain'] = $profile['req_url'] . ' ' . $profile['idp_url'];
+
+// Set a default authentication realm
+if (! array_key_exists('auth_realm', $profile))
+	$profile['auth_realm'] = 'phpMyID';
+
+// Determine the realm for digest authentication - DO NOT OVERRIDE
+$profile['php_realm'] = $profile['auth_realm'] . (ini_get('safe_mode') ? '-' . getmyuid() : '');
+
+// Set a default lifetime - the lesser of GC and cache time
+if (! array_key_exists('lifetime', $profile)) {
+	$sce = session_cache_expire() * 60;
+	$gcm = ini_get('session.gc_maxlifetime');
+	$profile['lifetime'] = $sce < $gcm ? $sce : $gcm;
+}
+
+// Set a default log file
+if (! array_key_exists('logfile', $profile))
+	$profile['logfile'] = sys_get_temp_dir() . DIRECTORY_SEPARATOR . $profile['auth_realm'] . '.debug.log';
+
+
+/*
+ * Optional Initialization
+ */
+// Setup optional headers
+$profile['opt_headers'] = array();
+
+// Determine if I should add microid stuff
+if (array_key_exists('microid', $profile)) {
+	$hash = sha1($profile['idp_url']);
+	$values = is_array($profile['microid']) ? $profile['microid'] : array($profile['microid']);
+
+	foreach ($values as $microid) {
+		preg_match('/^([a-z]+)/i', $microid, $mtx);
+		$profile['opt_headers'][] = sprintf('<meta name="microid" content="%s+%s:sha1:%s" />', $mtx[1], $proto, sha1(sha1($microid) . $hash));
+	}
+}
+
+// Determine if I should add pavatar stuff
+if (array_key_exists('pavatar', $profile))
+	$profile['opt_headers'][] = sprintf('<link rel="pavatar" href="%s" />', $profile['pavatar']);
+
+
+/*
+ * Do it
+ */
+// Decide which runmode, based on user request or default
+$run_mode = (isset($_REQUEST['openid_mode'])
+	  && in_array($_REQUEST['openid_mode'], $known['openid_modes']))
+	? $_REQUEST['openid_mode']
+	: 'no';
+
+// Run in the determined runmode
+debug("Run mode: $run_mode at: " . time());
+debug($_REQUEST, 'Request params');
+call_user_func($run_mode . '_mode');
+?>
diff --git a/apps/user_openid/settings.php b/apps/user_openid/settings.php
new file mode 100644
index 0000000000..76316de100
--- /dev/null
+++ b/apps/user_openid/settings.php
@@ -0,0 +1,24 @@
+<?php
+
+require_once('../../lib/base.php');
+require( 'template.php' );
+if( !OC_USER::isLoggedIn()){
+    header( "Location: ".OC_HELPER::linkTo( "index.php" ));
+    exit();
+}
+
+if(isset($_POST['input_identity'])){
+	OC_PREFERENCES::setValue(OC_USER::getUser(),'user_openid','identity',$_POST['input_identity']);
+}
+
+OC_APP::setActiveNavigationEntry( "user_openid_settings" );
+
+$identity=OC_PREFERENCES::getValue(OC_USER::getUser(),'user_openid','identity','');
+
+$tmpl = new OC_TEMPLATE( "user_openid", "settings", "admin");
+$tmpl->assign('identity',$identity);
+$tmpl->assign('user',OC_USER::getUser());
+
+$tmpl->printPage();
+
+?>
diff --git a/apps/user_openid/templates/settings.php b/apps/user_openid/templates/settings.php
new file mode 100644
index 0000000000..7a1b530fbc
--- /dev/null
+++ b/apps/user_openid/templates/settings.php
@@ -0,0 +1,7 @@
+<form id="identity" action='#' method='post'>
+	<fieldset>
+		<legend><?php echo $l->t( 'OpenID identity' );?></legend>
+		<label for='input_identity'>OpenID identity for <b><?php echo $_['user'];?></b></label><br/>
+		<input name='input_identity' id='input_identity' value="<?php echo $_['identity'];?>"/><input type='submit' value='Save'/>
+	</fieldset>
+</form>
diff --git a/apps/user_openid/user.php b/apps/user_openid/user.php
new file mode 100644
index 0000000000..9ca1fd47c9
--- /dev/null
+++ b/apps/user_openid/user.php
@@ -0,0 +1,34 @@
+<?php
+
+/**
+* ownCloud
+*
+* @author Robin Appelman
+* @copyright 2011 Robin Appelman icewind1991@gmail.com
+*
+* This library is free software; you can redistribute it and/or
+* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
+* License as published by the Free Software Foundation; either
+* version 3 of the License, or any later version.
+*
+* This library is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
+*
+* You should have received a copy of the GNU Affero General Public
+* License along with this library.  If not, see <http://www.gnu.org/licenses/>.
+*
+*/
+
+$USERNAME=substr($_SERVER["REQUEST_URI"],strpos($_SERVER["REQUEST_URI"],'.php/')+5);
+if(strpos($USERNAME,'?')){
+	$USERNAME=substr($USERNAME,0,strpos($USERNAME,'?'));
+}
+
+require_once '../../lib/base.php';
+
+require_once 'phpmyid.php';
+
+
+?>
\ No newline at end of file
diff --git a/apps/user_openid/user_openid.php b/apps/user_openid/user_openid.php
new file mode 100644
index 0000000000..d4bcefeb26
--- /dev/null
+++ b/apps/user_openid/user_openid.php
@@ -0,0 +1,73 @@
+<?php
+
+/**
+ * ownCloud
+ *
+ * @author Robin Appelman
+ * @copyright 2011 Robin Appelman icewind1991gmailc.om
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU AFFERO GENERAL PUBLIC LICENSE for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public
+ * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+require_once('User/backend.php');
+require_once('class.openid.v3.php');
+
+/**
+ * Class for user management in a SQL Database (e.g. MySQL, SQLite)
+ */
+class OC_USER_OPENID extends OC_USER_BACKEND {
+	/**
+	 * @brief Check if the password is correct
+	 * @param $uid The username
+	 * @param $password The password
+	 * @returns true/false
+	 *
+	 * Check if the password is correct without logging in the user
+	 */
+	public function checkPassword( $uid, $password ){
+		global $WEBROOT;
+		// Get identity from user and redirect browser to OpenID Server
+		$openid = new SimpleOpenID;
+		$openid->SetIdentity($uid);
+		$openid->SetTrustRoot('http://' . $_SERVER["HTTP_HOST"]);
+		if ($openid->GetOpenIDServer()){
+			$openid->SetApprovedURL('http://' . $_SERVER["HTTP_HOST"] . $WEBROOT);      // Send Response from OpenID server to this script
+			$openid->Redirect();     // This will redirect user to OpenID Server
+			exit;
+		}else{
+			$error = $openid->GetError();
+			echo "ERROR CODE: " . $error['code'] . "<br>";
+			echo "ERROR DESCRIPTION: " . $error['description'] . "<br>";
+		}
+		exit;
+	}
+	
+	/**
+	 * find the user that can be authenticated with an openid identity
+	 */
+	public static function findUserForIdentity($identity){
+		$query=OC_DB::prepare('SELECT userid FROM *PREFIX*preferences WHERE appid=? AND configkey=? AND configvalue=?');
+		$result=$query->execute(array('user_openid','identity',$identity))->fetchAll();
+		if(count($result)>0){
+			return $result[0]['userid'];
+		}else{
+			return false;
+		}
+	}
+}
+
+
+
+?>
\ No newline at end of file