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Code Issues 1 Releases Wiki Activity

adjust password generator tool to use cryptographically secure RNG

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This commit is contained in:
Kyle Spearrin 2016-10-15 00:37:57 -04:00
parent a3398c675b
commit 3ac9196c98
1 changed files with 32 additions and 1 deletions
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33
src/services/passwordGenerationService.js
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@ -99,8 +99,39 @@ function initPasswordGenerationService() {
return password;
};
// EFForg/OpenWireless
// ref https://github.com/EFForg/OpenWireless/blob/master/app/js/diceware.js
function randomInt(min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
var rval = 0;
var range = max - min;
var bits_needed = Math.ceil(Math.log2(range));
if (bits_needed > 53) {
throw new Exception("We cannot generate numbers larger than 53 bits.");
}
var bytes_needed = Math.ceil(bits_needed / 8);
var mask = Math.pow(2, bits_needed) - 1;
// 7776 -> (2^13 = 8192) -1 == 8191 or 0x00001111 11111111
// Create byte array and fill with N random numbers
var byteArray = new Uint8Array(bytes_needed);
window.crypto.getRandomValues(byteArray);
var p = (bytes_needed - 1) * 8;
for (var i = 0; i < bytes_needed; i++) {
rval += byteArray[i] * Math.pow(2, p);
p -= 8;
}
// Use & to apply the mask and reduce the number of recursive lookups
rval = rval & mask;
if (rval >= range) {
// Integer out of acceptable range
return randomInt(min, max);
}
// Return an integer that falls within the range
return min + rval;
}
function extend() {