30 lines
746 B
JavaScript
30 lines
746 B
JavaScript
'use strict';
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/* global crypto:true */
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var crypto = require('crypto');
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// This string has length 32, a power of 2, so the modulus doesn't introduce a
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// bias.
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var _randomStringChars = 'abcdefghijklmnopqrstuvwxyz012345';
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module.exports = {
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string: function(length) {
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var max = _randomStringChars.length;
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var bytes = crypto.randomBytes(length);
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var ret = [];
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for (var i = 0; i < length; i++) {
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ret.push(_randomStringChars.substr(bytes[i] % max, 1));
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}
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return ret.join('');
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}
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, number: function(max) {
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return Math.floor(Math.random() * max);
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}
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, numberString: function(max) {
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var t = ('' + (max - 1)).length;
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var p = new Array(t + 1).join('0');
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return (p + this.number(max)).slice(-t);
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}
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};
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