security-and-privacy/CanvasBlocker
security-and-privacy/CanvasBlocker
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Code Releases Activity

Added preference to control rng type.

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This commit is contained in:
kkapsner 2016-08-06 19:17:36 +02:00
parent 447ff54222
commit 1b2c4cb487
9 changed files with 233 additions and 126 deletions
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27
lib/modifiedAPI.js
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@ -1,20 +1,13 @@
/* jslint moz: true, bitwise: true */
/* jslint moz: true */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
(function(){
"use strict";
const rnd = {};
var randomSupply = null;
function getFakeCanvas(window, original){
var domain = window.document.location.host;
if (!rnd[domain]){
rnd[domain] = new Uint8Array(128);
for (var i = 0; i < rnd[domain].length; i += 1){
rnd[domain][i] = Math.floor(Math.random() * 0xFF);
}
console.log("created new rnd for domain", domain);
}
var context = window.HTMLCanvasElement.prototype.getContext.call(original, "2d");
var imageData, data, source;
if (context){
@ -38,14 +31,10 @@
}
data = imageData.data;
var l = data.length;
var rng = randomSupply.getRng(l, window);
for (var i = 0; i < l; i += 1){
var value = source[i];
var index = value & 0x7F;
var bitIndex = ((i & 0x03) << 1) | (value >>> 7);
var bit = (rnd[domain][index] >>> bitIndex) & 0x01;
if (bitIndex % 2) console.log(rnd[domain][index], index, bitIndex, bit);
data[i] = value ^ bit;
data[i] = rng(source[i], i);
}
var canvas = original.cloneNode(true);
context = window.HTMLCanvasElement.prototype.getContext.call(canvas, "2d");
@ -55,6 +44,10 @@
function getWindow(canvas){
return canvas.ownerDocument.defaultView;
}
exports.setRandomSupply = function(supply){
randomSupply = supply;
};
// changed functions and their fakes
exports.changedFunctions = {
getContext: {
@ -111,7 +104,7 @@
imageData.data[i] = data[i];
}
return imageData;
}
};
}
},
readPixels: {