-
-
Notifications
You must be signed in to change notification settings - Fork 879
/
rng-browser.js
21 lines (19 loc) · 1.01 KB
/
rng-browser.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
// Unique ID creation requires a high quality random # generator. In the browser we therefore
// require the crypto API and do not support built-in fallback to lower quality random number
// generators (like Math.random()).
// getRandomValues needs to be invoked in a context where "this" is a Crypto implementation. Also,
// find the complete implementation of crypto (msCrypto) on IE11.
var getRandomValues =
(typeof crypto != 'undefined' && crypto.getRandomValues && crypto.getRandomValues.bind(crypto)) ||
(typeof msCrypto != 'undefined' &&
typeof window.msCrypto.getRandomValues == 'function' &&
msCrypto.getRandomValues.bind(msCrypto));
var rnds8 = new Uint8Array(16); // eslint-disable-line no-undef
export default function rng() {
if (!getRandomValues) {
throw new Error(
'uuid: This browser does not seem to support crypto.getRandomValues(). If you need to support this browser, please provide a custom random number generator through options.rng.',
);
}
return getRandomValues(rnds8);
}