diff --git a/RestControllers/userController.php b/RestControllers/userController.php
new file mode 100644
index 0000000..2cc1127
--- /dev/null
+++ b/RestControllers/userController.php
@@ -0,0 +1,104 @@
+<?php
+/**
+ * Main user controller file
+ *
+ * @author Pierre HUBERT
+ */
+
+//Enable access to exceptions handler
+use \Jacwright\RestServer\RestException;
+
+class userController
+{
+	/**
+	 * Try to connect user and return login tokens
+	 * 
+	 * @url POST /user/connectUSER
+	 */
+	public function connectUSER(){
+		 //Check variables sent in request
+		 if(!isset($_POST['userMail']) OR !isset($_POST['userPassword']))
+			throw new RestException(401, "Missing data !");
+		
+		//Retrieve database connection
+		$db = CS::get()->db;;
+
+		//Extract data
+		$userMail = $_POST["userMail"];
+		$userPassword = $_POST['userPassword'];
+
+		//Try to perform login
+		$loginTokens = CS::get()->user->generateUserLoginTokens($userMail, $userPassword, APIServiceID, $db);
+
+		if(!$loginTokens)
+			throw new RestException(401, "Invalid e-mail address / password !");
+
+		//Return result with tokens
+		return array(
+			"success" => "User logged in !",
+			"tokens" => array(
+				"token1" => $loginTokens[0],
+				"token2" => $loginTokens[1],
+			),
+		);
+	 }
+
+	 /**
+	  * Request token delete (= disconnectUSER)
+	  *
+	  * @url POST /user/disconnectUSER
+	  */
+	  public function disconnectUSER(){
+		//Check variables sent in request
+		if(!isset($_POST['token1']) OR !isset($_POST['token2']))
+			throw new RestException(401, "Missing data !");
+
+		//Prepare data
+		$tokens = array($_POST['token1'], $_POST['token2']);
+
+		//Try to delete token
+		if(!CS::get()->user->deleteUserLoginToken($tokens, APIServiceID))
+			throw new RestException(500, "Something went wrong while trying to logout user !");
+
+		//Everything is ok
+		return array("success" => "The user has been disconnected !");
+	  }
+
+	/**
+	 * Get current user infos using tokens
+	 *
+	 * @url POST /user/getCurrentUserInfos
+	 * @return array The result
+	 */
+	public function getCurrentUserInfosWithTokens() : array{
+		//Check variables sent in request (for login)
+		if(!isset($_POST['token1']) OR !isset($_POST['token2']))
+			throw new RestException(401, "Missing tokens !");
+
+		//Preparing data
+		$tokens = array($_POST['token1'], $_POST['token2']);
+
+		//Try to get user infos from token
+		$userInfos = CS::get()->user->getUserInfosFromToken($tokens, APIServiceID);
+		
+		//Check if response is empty
+		if(count($userInfos) == 0)
+			throw new RestException(401, "Couldn't get user data !");
+		
+		//Return result
+		return array($userInfos);
+	}
+
+	/**
+	 * Get current user infos using tokens
+	 *
+	 * @url POST /user/getCurrentUserID
+	 */
+	public function getCurrentUserIDUsingTokens(){
+		  //Get user infos
+		  $userInfos = $this->getCurrentUserInfosWithTokens();
+
+		  //Return userID
+		  return array("userID" => $userInfos[0]["userID"]);
+	}
+}
\ No newline at end of file
diff --git a/classes/tokens.php b/classes/tokens.php
new file mode 100644
index 0000000..0013cfa
--- /dev/null
+++ b/classes/tokens.php
@@ -0,0 +1,60 @@
+<?php
+/**
+ * Tokens checker class
+ *
+ * @author Pierre HUBERT
+ */
+
+class Tokens{
+	
+	/**
+	 * Check request tokens
+	 *
+	 * @return Boolean Depends of the validity of the tokens
+	 */
+	public function checkRequestTokens(){
+		if(!isset($_POST['serviceName']) OR !isset($_POST['serviceToken']))
+			return false; //No token specified
+		
+		//Check tokens
+		if(!$serviceID = $this->validateTokens($_POST['serviceName'], $_POST['serviceToken']))
+			return false;
+
+		//Save service ID in a constant
+		define("APIServiceID", $serviceID);
+
+		//Else everything went good
+		return true;
+	}
+
+	/**
+	 * Check API credentials (tokens)
+	 *
+	 * @param 	String 	    $serviceName 	The name of the service
+	 * @param 	String  	$token 		 	The service's token
+	 * @return 	Boolean 			    	False or Tokens ID / Depending of validity of credentials
+	 */
+	private function validateTokens($serviceName, $token){
+		//Prepare DataBase request
+		$tableName = "API_ServicesToken";
+		$conditions = "WHERE serviceName = ? AND token = ?";
+		$values = array(
+			$serviceName,
+			$token
+		);
+		//Make request
+		$requestResult = CS::get()->db->select($tableName, $conditions, $values);
+
+		//Analyse result
+		if(count($requestResult) == 0){
+			//There is no available entries
+			return false;
+		}
+		else {
+			//The API is correctly identified
+			return $requestResult[0]['ID'];
+		}
+
+	}
+
+}
\ No newline at end of file
diff --git a/classes/user.php b/classes/user.php
new file mode 100644
index 0000000..4817ac3
--- /dev/null
+++ b/classes/user.php
@@ -0,0 +1,171 @@
+<?php
+/**
+ * Main user class
+ *
+ * @author Pierre HUBER
+ */
+
+class User{
+	/**
+	 * Try to login user with returning a service token
+	 * 
+	 * @param String $email The e-mail address of the user
+	 * @param String $password The password of the user
+	 * @param String $serviceID The ID of the service
+	 * @return String Token if success, false if fails
+	 */
+	public function generateUserLoginTokens($email, $password, $serviceID){
+		//Try to find user ID in the database
+		$conditions = "WHERE mail = ? AND password = ?";
+		$values = array(
+			$email,
+			$this->cryptPassword($password)
+		);
+		$userInfos = CS::get()->db->select("utilisateurs", $conditions, $values);
+
+		//Check if there is anything
+		if(count($userInfos) == 0)
+			return false; //Not any account was found
+		
+		//Extract first value ID
+		$userID = $userInfos[0]['ID'];
+
+		//Check if any other token already exists
+		$existingTokens = $this->getUserLoginTokenByIDs($userID, $serviceID, CS::get()->db);
+		
+		if(is_array($existingTokens)){
+			//Return result
+			return $existingTokens;
+		}
+
+		//Generate random tokens
+		$token1 = random_str(75);
+		$token2 = random_str(75);
+
+		//Insert token in the database
+		$tableName = "API_userLoginToken";
+		$insertValues = array(
+			"ID_utilisateurs" => $userID,
+			"ID_API_ServicesToken" => $serviceID,
+			"token1" => $token1,
+			"token2" => $token2
+		);
+		if(!CS::get()->db->addLine($tableName, $insertValues))
+			return false; //Something went wrong
+
+		//We can return tokens
+		return array($token1, $token2);
+	}
+
+	/**
+	 * Get token with the help of userID and serviceID
+	 *
+	 * @param Integer $userID The ID of the user
+	 * @param Integer $serviceID The ID of the service
+	 * @return False if it fails, or tokens if success
+	 */
+	function getUserLoginTokenByIDs($userID, $serviceID){
+		//Prepare database request
+		$conditions = "WHERE ID_utilisateurs = ? AND ID_API_ServicesToken = ?";
+		$values = array(
+			$userID,
+			$serviceID
+		);
+		$tokenInfos = CS::get()->db->select("API_userLoginToken", $conditions, $values);
+		
+		if(count($tokenInfos) == 0)
+			return false; //There is nobody at this address
+		else {
+			//Return tokens
+			$token1 = $tokenInfos[0]['token1'];
+			$token2 = $tokenInfos[0]['token2'];
+			return array($token1, $token2);
+		}
+	}
+
+	/**
+	 * Delete token from given informations
+	 *
+	 * @param Array $tokens The tokens to delete
+	 * @param String $serviceID The service ID
+	 * @return Boolean False if it fails
+	 */
+	function deleteUserLoginToken(array $tokens, $serviceID){
+		//Check the number of given tokens
+		if(count($tokens) != 2)
+			return false;
+
+		//Prepare database request
+		$condition = "token1 = ? AND token2 = ? AND ID_API_ServicesToken = ?";
+		$values = array(
+			$tokens[0],
+			$tokens[1],
+			$serviceID
+		);
+
+		//Try to perform request
+		if(!CS::get()->db->deleteEntry("API_userLoginToken", $condition, $values))
+			return false; //Something went wrong during the request
+		
+		//Everything is ok
+		return true;
+	}
+
+	/**
+	 * Get User Infos from token
+	 *
+	 * @param Array $tokens The user login tokens
+	 * @param String $serviceID The ID of the service
+	 * @return Array The result of the function (empty one if it fails)
+	 */
+	function getUserInfosFromToken(array $tokens, $serviceID): array {
+		//Check token number
+		if(count($tokens) != 2)
+			return array();
+
+		//Prepare database request
+		$tablesName = "utilisateurs, API_userLoginToken";
+		$conditions = "WHERE utilisateurs.ID = API_userLoginToken.ID_utilisateurs AND API_userLoginToken.ID_API_ServicesToken = ? AND API_userLoginToken.token1 = ? AND API_userLoginToken.token2 = ?";
+		$conditionsValues = array(
+			$serviceID,
+			$tokens[0],
+			$tokens[1]
+		);
+		
+		//Perform request
+		$userInfos = CS::get()->db->select($tablesName, $conditions, $conditionsValues);
+		
+		//Check if result is correct or not
+		if(count($userInfos) == 0)
+			return array(); //No result
+		
+		//Prepare return
+		$return = array();
+		$return['userID'] = $userInfos[0]['ID_utilisateurs'];
+		$return['firstName'] = $userInfos[0]['nom'];
+		$return['lastName'] = $userInfos[0]['prenom'];
+		$return['mailAdress'] = $userInfos[0]['mail'];
+		$return['accountCreationDate'] = $userInfos[0]['date_creation'];
+		$return['publicPage'] = $userInfos[0]['public'];
+		$return['openPage'] = $userInfos[0]['pageouverte'];
+		$return['noCommentOnHisPage'] = $userInfos[0]['bloquecommentaire'];
+		$return['allowPostFromFriendOnHisPage'] = $userInfos[0]['autoriser_post_amis'];
+		$return['virtualDirectory'] = $userInfos[0]['sous_repertoire'];
+		$return['personnalWebsite'] = $userInfos[0]['site_web'];
+		$return['publicFriendList'] = $userInfos[0]['liste_amis_publique'];
+
+		//Return result
+		return $return;
+	}
+
+	/**
+	 * Crypt user password
+	 *
+	 * @param String $userPassword The password to crypt
+	 * @return String The encrypted password
+	 */
+	public function cryptPassword($userPassword){
+		return crypt(sha1($userPassword), sha1($userPassword));
+	}
+
+}
\ No newline at end of file
diff --git a/functions/errors.php b/functions/errors.php
new file mode 100644
index 0000000..f74777a
--- /dev/null
+++ b/functions/errors.php
@@ -0,0 +1,30 @@
+<?php
+/**
+ * Error functions
+ *
+ * @author Pierre HUBERT
+ */
+
+/**
+ * Display a rest fatal error
+ *
+ * @param Integer $errorCode The code of the error
+ * @param String $errorMessage The message of the error
+ */
+function Rest_fatal_error($errorCode, $errorMessage){
+    //Returns a fatal error code
+    http_response_code($errorCode);
+
+    //Display message
+    header("Content-Type: application/json");
+
+    echo json_encode(array(
+        "error" => array(
+            "code"=>$errorCode,
+            "message" => $errorMessage,
+        )
+    ), JSON_PRETTY_PRINT);
+
+    //Quit
+    exit();
+}
\ No newline at end of file
diff --git a/functions/strings.php b/functions/strings.php
new file mode 100644
index 0000000..0f8e3c2
--- /dev/null
+++ b/functions/strings.php
@@ -0,0 +1,25 @@
+<?php
+/**
+ * API specific methods
+ *
+ * @author Pierre HUBERT
+ */
+
+/**
+ * Generate a random string, using a cryptographically secure 
+ * pseudorandom number generator (random_int)
+ * 
+ * @param int $length      How many characters do we want?
+ * @param string $keyspace A string of all possible characters
+ *                         to select from
+ * @return string
+ */
+function random_str($length, $keyspace = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ')
+{
+    $str = '';
+    $max = mb_strlen($keyspace, '8bit') - 1;
+    for ($i = 0; $i < $length; ++$i) {
+        $str .= $keyspace[random_int(0, $max)];
+    }
+    return $str;
+}
diff --git a/index.php b/index.php
index 6689263..2b567b4 100644
--- a/index.php
+++ b/index.php
@@ -27,6 +27,14 @@ header("Access-Control-Allow-Origin: *");
 if(!isset($_GET["format"]))
     $_GET['format'] = "json";
 
+//Check tokens
+if($cs->config->get("site_mode") == "debug"){
+	$_POST['serviceName'] = "testService";
+	$_POST['serviceToken'] = "testPasswd";
+}
+if(!$cs->tokens->checkRequestTokens())
+	Rest_fatal_error(401, "Please check your tokens!");
+
 /**
  * Handle Rest requests
  */
diff --git a/init.php b/init.php
index e526375..e0edd49 100644
--- a/init.php
+++ b/init.php
@@ -29,6 +29,7 @@ $cs->register("config", $config);
 foreach(glob(PROJECT_PATH."config/*.php") as $confFile){
 	require $confFile;
 }
+unset($config);
 
 //Connexion to the database
 $db = new DBLibrary(($cs->config->get("site_mode") == "debug"));
@@ -37,7 +38,14 @@ $db->openMYSQL($cs->config->get('mysql')['host'],
         $cs->config->get('mysql')['user'], 
         $cs->config->get('mysql')['password'], 
         $cs->config->get('mysql')['database']);
+unset($db);
 
-//Delete created elements (security)
-unset($config);
-unset($db);
\ No newline at end of file
+//Add token object
+$tokens = new Tokens();
+$cs->register("tokens", $tokens);
+unset($tokens);
+
+//Add user object
+$user = new User();
+$cs->register("user", $user);
+unset($user);
\ No newline at end of file