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authorruki <waruqi@gmail.com>2018-11-08 00:38:48 +0800
committerruki <waruqi@gmail.com>2018-11-07 21:53:09 +0800
commit26105034da4fcce7ac883c899d781f016559310d (patch)
treec459a5dc4e3aa0972d9919033ece511ce76dd129 /node_modules/uuid/lib/rng-browser.js
parent2c77f00f1a7ecb6c8192f9c16d3b2001b254a107 (diff)
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+// Unique ID creation requires a high quality random # generator. In the
+// browser this is a little complicated due to unknown quality of Math.random()
+// and inconsistent support for the `crypto` API. We do the best we can via
+// feature-detection
+
+// getRandomValues needs to be invoked in a context where "this" is a Crypto
+// implementation. Also, find the complete implementation of crypto 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));
+
+if (getRandomValues) {
+ // WHATWG crypto RNG - http://wiki.whatwg.org/wiki/Crypto
+ var rnds8 = new Uint8Array(16); // eslint-disable-line no-undef
+
+ module.exports = function whatwgRNG() {
+ getRandomValues(rnds8);
+ return rnds8;
+ };
+} else {
+ // Math.random()-based (RNG)
+ //
+ // If all else fails, use Math.random(). It's fast, but is of unspecified
+ // quality.
+ var rnds = new Array(16);
+
+ module.exports = function mathRNG() {
+ 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;
+ };
+}