root / HServer / 00.Server / 00.Program / node_modules / random-bytes / index.js
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| 1 | 39 | HKM | /*!
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| 2 | * random-bytes
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| 3 | * Copyright(c) 2016 Douglas Christopher Wilson
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| 4 | * MIT Licensed
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| 5 | */
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| 6 | |||
| 7 | 'use strict'
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| 8 | |||
| 9 | /**
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| 10 | * Module dependencies.
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| 11 | * @private
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| 12 | */
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| 13 | |||
| 14 | var crypto = require('crypto') |
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| 15 | |||
| 16 | /**
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| 17 | * Module variables.
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| 18 | * @private
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| 19 | */
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| 20 | |||
| 21 | var generateAttempts = crypto.randomBytes === crypto.pseudoRandomBytes ? 1 : 3 |
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| 22 | |||
| 23 | /**
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| 24 | * Module exports.
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| 25 | * @public
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| 26 | */
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| 27 | |||
| 28 | module.exports = randomBytes |
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| 29 | module.exports.sync = randomBytesSync |
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| 30 | |||
| 31 | /**
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| 32 | * Generates strong pseudo-random bytes.
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| 33 | *
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| 34 | * @param {number} size
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| 35 | * @param {function} [callback]
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| 36 | * @return {Promise}
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| 37 | * @public
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| 38 | */
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| 39 | |||
| 40 | function randomBytes(size, callback) { |
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| 41 | // validate callback is a function, if provided
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| 42 | if (callback !== undefined && typeof callback !== 'function') { |
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| 43 | throw new TypeError('argument callback must be a function') |
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| 44 | } |
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| 45 | |||
| 46 | // require the callback without promises
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| 47 | if (!callback && !global.Promise) {
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| 48 | throw new TypeError('argument callback is required') |
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| 49 | } |
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| 50 | |||
| 51 | if (callback) {
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| 52 | // classic callback style
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| 53 | return generateRandomBytes(size, generateAttempts, callback)
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| 54 | } |
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| 55 | |||
| 56 | return new Promise(function executor(resolve, reject) { |
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| 57 | generateRandomBytes(size, generateAttempts, function onRandomBytes(err, str) { |
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| 58 | if (err) return reject(err) |
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| 59 | resolve(str) |
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| 60 | }) |
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| 61 | }) |
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| 62 | } |
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| 63 | |||
| 64 | /**
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| 65 | * Generates strong pseudo-random bytes sync.
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| 66 | *
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| 67 | * @param {number} size
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| 68 | * @return {Buffer}
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| 69 | * @public
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| 70 | */
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| 71 | |||
| 72 | function randomBytesSync(size) { |
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| 73 | var err = null |
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| 74 | |||
| 75 | for (var i = 0; i < generateAttempts; i++) { |
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| 76 | try {
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| 77 | return crypto.randomBytes(size)
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| 78 | } catch (e) {
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| 79 | err = e |
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| 80 | } |
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| 81 | } |
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| 82 | |||
| 83 | throw err
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| 84 | } |
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| 85 | |||
| 86 | /**
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| 87 | * Generates strong pseudo-random bytes.
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| 88 | *
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| 89 | * @param {number} size
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| 90 | * @param {number} attempts
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| 91 | * @param {function} callback
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| 92 | * @private
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| 93 | */
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| 94 | |||
| 95 | function generateRandomBytes(size, attempts, callback) { |
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| 96 | crypto.randomBytes(size, function onRandomBytes(err, buf) { |
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| 97 | if (!err) return callback(null, buf) |
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| 98 | if (!--attempts) return callback(err) |
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| 99 | setTimeout(generateRandomBytes.bind(null, size, attempts, callback), 10) |
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| 100 | }) |
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| 101 | } |