Last change
on this file since e29cc2e was e29cc2e, checked in by Ema <ema_spirova@…>, 3 years ago |
primeNG components
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100644
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File size:
1.3 KB
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[6a3a178] | 1 | // Unique ID creation requires a high quality random # generator. In the
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| 2 | // browser this is a little complicated due to unknown quality of Math.random()
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| 3 | // and inconsistent support for the `crypto` API. We do the best we can via
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| 4 | // feature-detection
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| 5 |
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| 6 | // getRandomValues needs to be invoked in a context where "this" is a Crypto
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| 7 | // implementation. Also, find the complete implementation of crypto on IE11.
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| 8 | var getRandomValues = (typeof(crypto) != 'undefined' && crypto.getRandomValues && crypto.getRandomValues.bind(crypto)) ||
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| 9 | (typeof(msCrypto) != 'undefined' && typeof window.msCrypto.getRandomValues == 'function' && msCrypto.getRandomValues.bind(msCrypto));
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| 10 |
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| 11 | if (getRandomValues) {
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| 12 | // WHATWG crypto RNG - http://wiki.whatwg.org/wiki/Crypto
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| 13 | var rnds8 = new Uint8Array(16); // eslint-disable-line no-undef
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| 14 |
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| 15 | module.exports = function whatwgRNG() {
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| 16 | getRandomValues(rnds8);
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| 17 | return rnds8;
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| 18 | };
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| 19 | } else {
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| 20 | // Math.random()-based (RNG)
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| 21 | //
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| 22 | // If all else fails, use Math.random(). It's fast, but is of unspecified
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| 23 | // quality.
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| 24 | var rnds = new Array(16);
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| 25 |
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| 26 | module.exports = function mathRNG() {
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| 27 | for (var i = 0, r; i < 16; i++) {
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| 28 | if ((i & 0x03) === 0) r = Math.random() * 0x100000000;
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| 29 | rnds[i] = r >>> ((i & 0x03) << 3) & 0xff;
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| 30 | }
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| 31 |
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| 32 | return rnds;
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| 33 | };
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| 34 | }
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