security-and-privacy/CanvasBlocker
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Shared persistent rnd between processes.

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Fixes #103.
This commit is contained in:
kkapsner 2017-02-01 10:49:33 +01:00
parent ab42c76a44
commit eb6494eca5
3 changed files with 30 additions and 4 deletions
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19
lib/randomSupplies.js
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@ -16,16 +16,27 @@
}
return window.location.host;
}
const persistentRnd = Object.create(null);
exports.persistent = {
getRng: function(length, window){
const getPersistentRnd = (function(){
const {process} = require("sdk/remote/child");
process.port.on("canvasBlocker-set-domain-rnd", function(process, {domain, rnd}){
persistentRnd[domain] = new Uint8Array(rnd);
});
const persistentRnd = Object.create(null);
return function getPersistentRnd(window){
var domain = getDomain(window);
if (!persistentRnd[domain]){
// create the (sub-)domains random numbers if not existing
persistentRnd[domain] = new Uint8Array(128);
window.crypto.getRandomValues(persistentRnd[domain]);
process.port.emit("canvasBlocker-new-domain-rnd", {domain, rnd: persistentRnd[domain]});
}
var bitSet = persistentRnd[domain];
return persistentRnd[domain];
}
}());
exports.persistent = {
getRng: function(length, window){
var bitSet = getPersistentRnd(window);
return function(value, i){
// use the last 7 bits from the value for the index of the