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