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34 lines
1.3 KiB
34 lines
1.3 KiB
// Unique ID creation requires a high quality random # generator. In the |
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// browser this is a little complicated due to unknown quality of Math.random() |
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// and inconsistent support for the `crypto` API. We do the best we can via |
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// feature-detection |
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// getRandomValues needs to be invoked in a context where "this" is a Crypto |
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// implementation. Also, find the complete implementation of crypto on IE11. |
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var getRandomValues = (typeof(crypto) != 'undefined' && crypto.getRandomValues && crypto.getRandomValues.bind(crypto)) || |
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(typeof(msCrypto) != 'undefined' && typeof window.msCrypto.getRandomValues == 'function' && msCrypto.getRandomValues.bind(msCrypto)); |
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if (getRandomValues) { |
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// WHATWG crypto RNG - http://wiki.whatwg.org/wiki/Crypto |
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var rnds8 = new Uint8Array(16); // eslint-disable-line no-undef |
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module.exports = function whatwgRNG() { |
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getRandomValues(rnds8); |
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return rnds8; |
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}; |
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} else { |
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// Math.random()-based (RNG) |
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// |
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// If all else fails, use Math.random(). It's fast, but is of unspecified |
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// quality. |
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var rnds = new Array(16); |
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module.exports = function mathRNG() { |
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for (var i = 0, r; i < 16; i++) { |
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if ((i & 0x03) === 0) r = Math.random() * 0x100000000; |
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rnds[i] = r >>> ((i & 0x03) << 3) & 0xff; |
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} |
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return rnds; |
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}; |
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}
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