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Made UUID less predictable

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Official Noob 2019-08-04 20:01:39 +01:00 committed by GitHub
parent 18909ffef6
commit bbbb4f4877
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1 changed files with 24 additions and 2 deletions
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26
background.js
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@ -269,5 +269,27 @@ function getYouTubeVideoID(url) { // Return video id or false
return (match && match[7].length == 11) ? match[7] : false;
}
//uuid generator function from https://gist.github.com/jed/982883
function generateUUID(a){return a?(a^Math.random()*16>>a/4).toString(16):([1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g,generateUUID)}
function generateUUID() {
var length = 36;
var charset = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
var i;
var result = "";
var isOpera = Object.prototype.toString.call(window.opera) == '[object Opera]';
if (window.crypto && window.crypto.getRandomValues) {
values = new Uint32Array(length);
window.crypto.getRandomValues(values);
for (i = 0; i < length; i++) {
result += charset[values[i] % charset.length];
}
return result;
} else if (isOpera) //Opera's Math.random is secure, see http://lists.w3.org/Archives/Public/public-webcrypto/2013Jan/0063.html
{
for (i = 0; i < length; i++) {
result += charset[Math.floor(Math.random() * charset.length)];
}
return result;
} else {
alert("Your browser can't generate a secure UUID so Math.random() was used");
return Math.random().toString(36).substring(2) + (new Date()).getTime().toString(36);
}
}