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on this file since 59329aa was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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1 | // Unique ID creation requires a high quality random # generator. In the browser we therefore
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2 | // require the crypto API and do not support built-in fallback to lower quality random number
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3 | // generators (like Math.random()).
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4 | var getRandomValues;
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5 | var rnds8 = new Uint8Array(16);
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6 | export default function rng() {
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7 | // lazy load so that environments that need to polyfill have a chance to do so
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8 | if (!getRandomValues) {
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9 | // getRandomValues needs to be invoked in a context where "this" is a Crypto implementation. Also,
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10 | // find the complete implementation of crypto (msCrypto) on IE11.
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11 | getRandomValues = typeof crypto !== 'undefined' && crypto.getRandomValues && crypto.getRandomValues.bind(crypto) || typeof msCrypto !== 'undefined' && typeof msCrypto.getRandomValues === 'function' && msCrypto.getRandomValues.bind(msCrypto);
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12 |
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13 | if (!getRandomValues) {
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14 | throw new Error('crypto.getRandomValues() not supported. See https://github.com/uuidjs/uuid#getrandomvalues-not-supported');
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15 | }
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16 | }
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17 |
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18 | return getRandomValues(rnds8);
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19 | } |
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