STEAM AUTH

    function get_acces_token($username, $password, $mobile = true){
        global $UTIL;
        require_once("./phpseclib/Crypt/RSA.php");

        $cookies = array(
            "mobileClientVersion"   => "0 (2.1.3)",
            "mobileClient"          => "android",
            "Steam_Language"        => "english"
            );
        $headers = $UTIL->createCookie($cookies);
        $headers[] = "X-Requested-With: com.valvesoftware.android.steam.community";
        $headers[] = "Referer: https://steamcommunity.com/login?oauth_client_id=DE45CD61&oauth_scope=read_profile%20write_profile%20read_client%20write_client";

        $response = $UTIL->curl("https://store.steampowered.com/login/getrsakey", "username=".$username, $headers);
        $auth = json_decode($response, true);
        $rsa = new Crypt_RSA();
        $modulus = new Math_BigInteger($auth["publickey_mod"], 16);
        $exponent = new Math_BigInteger($auth["publickey_exp"], 16);

        $key = array('modulus' => $modulus, 'publicExponent' => $exponent);
        $rsa->setPublicKey($key);
        $rsa->loadKey($key, CRYPT_RSA_PUBLIC_FORMAT_RAW);
        $rsa->setEncryptionMode(CRYPT_RSA_ENCRYPTION_PKCS1);
        $enc_password = base64_encode($rsa->encrypt($password));

        $parameter = array(
            "username"          => $username,
            "password"          => $enc_password,
            "twofactorcode"     => $this->generateSteamGuardCode(),
            "rsatimestamp"      => $auth["timestamp"],
            "donotcache"        => time()."777"
            );
        if($mobile){
            $parameter['oauth_client_id']   = 'DE45CD61';
            $parameter['oauth_scope']       = 'read_profile write_profile read_client write_client';
            $parameter['loginfriendlyname'] = '#login_emailauth_friendlyname_mobile';
        }

        $response = $UTIL->curl("https://steamcommunity.com/login/dologin/", http_build_query($parameter), $headers);
        $json = json_decode($response, true);

        if($mobile){
            $json = json_decode($json["oauth"], true);
            $access_token = $json["oauth_token"];
            if($access_token != null){
                $UTIL->log("новый access_token=".$access_token);
                return $access_token;
            }
            else{
                $UTIL->log("ошибка получения access_token");
            }
        }
        else{
            //добавить не мобилу
        }
    }