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- 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;
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