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18 lines
492 B
18 lines
492 B
'use strict';
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const { promisify } = require('util')
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, randomBytes = promisify(require('crypto').randomBytes);
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//NOTE: should only be used for ints, floors your inputs
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module.exports = async (min, max) => {
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min = Math.floor(min);
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max = Math.floor(max);
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if (max <= min) return min;
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const mod = max - min + 1;
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const div = (((0xffffffff - (mod-1)) / mod) | 0) + 1;
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let g
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do {
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g = (await randomBytes(4)).readUInt32LE();
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} while (g > div * mod - 1);
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return ((g / div) | 0) + min;
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};
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