Wrappers for Workers. More...

Variables
var	slowBody

let	_old = _data.postMessage

_data	postMessage

var	wrappers

Detailed Description

Wrappers for Workers.

Author: Copyright (C) 2019-2022 Libor Polcak; Copyright (C) 2020 Peter Hornak; Copyright (C) 2021 Matus Svancar

License:: SPDX-License-Identifier: GPL-3.0-or-later

This wrapper aims on prevention of microarchitectural attacks. This code was originally a part of ChromeZero.

The wrappers support the following behaviour:

Polyfill: Completely eliminates the paralelism.
Randomly slow messages: Add noise to the postMessage method execution.

See also: Lipp, M., Gruss, D., Schwarz, M., Bidner, D., Maurice, C. et al. Practical Keystroke Timing Attacks in Sandboxed JavaScript. In:. August 2017, s. 191–209. ISBN 978-3-319-66398-2.; Schwarz, M., Lipp, M. a Gruss, D. JavaScript Zero: Real JavaScript and Zero Side-Channel Attacks. NDSS'18.; https://www.fit.vut.cz/study/thesis/22374/?year=0&sup=Pol%C4%8D%C3%A1k

Variable Documentation

◆ _old

let _old = _data.postMessage

◆ postMessage

_data postMessage

Initial value:

= function(message) {
      let delay = Math.floor(Math.random() * 10**9)
      let j;
      for (let i = 0; i < delay;) {
        j = i;
        i = j + 1;
      }
      return _old.call(_data, message);
    }
    return _data

◆ slowBody

var slowBody

Initial value:

= `

let _data = new originalF(path, ...args)

◆ wrappers