| 1 |
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| 2 | var rng;
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| 3 |
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| 4 | if (global.crypto && crypto.getRandomValues) {
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| 5 | // WHATWG crypto-based RNG - http://wiki.whatwg.org/wiki/Crypto
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| 6 | // Moderately fast, high quality
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| 7 | var _rnds8 = new Uint8Array(16);
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| 8 | rng = function whatwgRNG() {
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| 9 | crypto.getRandomValues(_rnds8);
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| 10 | return _rnds8;
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| 11 | };
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| 12 | }
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| 13 |
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| 14 | if (!rng) {
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| 15 | // Math.random()-based (RNG)
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| 16 | //
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| 17 | // If all else fails, use Math.random(). It's fast, but is of unspecified
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| 18 | // quality.
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| 19 | var _rnds = new Array(16);
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| 20 | rng = function() {
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| 21 | for (var i = 0, r; i < 16; i++) {
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| 22 | if ((i & 0x03) === 0) r = Math.random() * 0x100000000;
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| 23 | _rnds[i] = r >>> ((i & 0x03) << 3) & 0xff;
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| 24 | }
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| 25 |
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| 26 | return _rnds;
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| 27 | };
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| 28 | }
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| 29 |
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| 30 | module.exports = rng;
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| 31 |
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