32 lines
682 B
JavaScript
32 lines
682 B
JavaScript
|
|
||
|
|
var rng;
|
||
|
|
|
||
|
|
if (global.crypto && crypto.getRandomValues) {
|
||
|
|
// WHATWG crypto-based RNG - http://wiki.whatwg.org/wiki/Crypto
|
||
|
|
// Moderately fast, high quality
|
||
|
|
var _rnds8 = new Uint8Array(16);
|
||
|
|
rng = function whatwgRNG() {
|
||
|
|
crypto.getRandomValues(_rnds8);
|
||
|
|
return _rnds8;
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!rng) {
|
||
|
|
// Math.random()-based (RNG)
|
||
|
|
//
|
||
|
|
// If all else fails, use Math.random(). It's fast, but is of unspecified
|
||
|
|
// quality.
|
||
|
|
var _rnds = new Array(16);
|
||
|
|
rng = function() {
|
||
|
|
for (var i = 0, r; i < 16; i++) {
|
||
|
|
if ((i & 0x03) === 0) r = Math.random() * 0x100000000;
|
||
|
|
_rnds[i] = r >>> ((i & 0x03) << 3) & 0xff;
|
||
|
|
}
|
||
|
|
|
||
|
|
return _rnds;
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = rng;
|
||
|
|
|