forked from mirrors/easyappointments
37 lines
916 B
JavaScript
37 lines
916 B
JavaScript
|
// Original code adapted from Robert Kieffer.
|
||
|
|
// details at https://github.com/broofa/node-uuid
|
||
|
|
(function() {
|
||
|
|
var _global = this;
|
||
|
|
|
||
|
|
var mathRNG, whatwgRNG;
|
||
|
|
|
||
|
|
// NOTE: Math.random() does not guarantee "cryptographic quality"
|
||
|
|
mathRNG = function(size) {
|
||
|
|
var bytes = new Array(size);
|
||
|
|
var r;
|
||
|
|
|
||
|
|
for (var i = 0, r; i < size; i++) {
|
||
|
|
if ((i & 0x03) == 0) r = Math.random() * 0x100000000;
|
||
|
|
bytes[i] = r >>> ((i & 0x03) << 3) & 0xff;
|
||
|
|
}
|
||
|
|
|
||
|
|
return bytes;
|
||
|
|
}
|
||
|
|
|
||
|
|
// currently only available in webkit-based browsers.
|
||
|
|
if (_global.crypto && crypto.getRandomValues) {
|
||
|
|
var _rnds = new Uint32Array(4);
|
||
|
|
whatwgRNG = function(size) {
|
||
|
|
var bytes = new Array(size);
|
||
|
|
crypto.getRandomValues(_rnds);
|
||
|
|
|
||
|
|
for (var c = 0 ; c < size; c++) {
|
||
|
|
bytes[c] = _rnds[c >> 2] >>> ((c & 0x03) * 8) & 0xff;
|
||
|
|
}
|
||
|
|
return bytes;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = whatwgRNG || mathRNG;
|
||
|
|
|
||
|
|
}())
|