security-and-privacy/CanvasBlocker
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Added option to store data for persistent rng.

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Fixes #102.
This commit is contained in:
kkapsner 2017-02-10 17:37:35 +01:00
parent 3b14e56537
commit a8611230b1
7 changed files with 99 additions and 8 deletions
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8
lib/randomSupplies.js
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@ -17,19 +17,23 @@
return window.location.host;
}
const getPersistentRnd = (function(){
var persistentRnd = Object.create(null);
const {process} = require("sdk/remote/child");
process.port.on("canvasBlocker-set-domain-rnd", function(process, {domain, rnd}){
persistentRnd[domain] = new Uint8Array(rnd);
});
process.port.on("canvasBlocker-clear-domain-rnd", function(){
persistentRnd = Object.create(null);
});
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]});
process.port.emit("canvasBlocker-new-domain-rnd", {domain, rnd: Array.from(persistentRnd[domain])});
}
return persistentRnd[domain];
}