random.mjs

   1 import { randomInt } from 'node:crypto'
   2
   3 import { bench, group, run } from 'tatami-ng'
   4
   5 import {
   6   secureRandom,
   7   secureRandomWithRandomValues
   8 } from './benchmark-utils.mjs'
   9
  10 const maximum = 281474976710655
  11
  12 /**
  13  * @param max
  14  * @param min
  15  * @returns
  16  */
  17 function getSecureRandomInteger (max = Number.MAX_SAFE_INTEGER, min = 0) {
  18   if (max < min || max < 0 || min < 0) {
  19     throw new RangeError('Invalid interval')
  20   }
  21   max = Math.floor(max)
  22   if (min !== 0) {
  23     min = Math.ceil(min)
  24     return Math.floor(secureRandom() * (max - min + 1)) + min
  25   }
  26   return Math.floor(secureRandom() * (max + 1))
  27 }
  28
  29 /**
  30  * @param max
  31  * @param min
  32  * @returns
  33  */
  34 function getSecureRandomIntegerWithRandomValues (
  35   max = Number.MAX_SAFE_INTEGER,
  36   min = 0
  37 ) {
  38   if (max < min || max < 0 || min < 0) {
  39     throw new RangeError('Invalid interval')
  40   }
  41   max = Math.floor(max)
  42   if (min !== 0) {
  43     min = Math.ceil(min)
  44     return Math.floor(secureRandomWithRandomValues() * (max - min + 1)) + min
  45   }
  46   return Math.floor(secureRandomWithRandomValues() * (max + 1))
  47 }
  48
  49 /**
  50  * @param max
  51  * @param min
  52  * @returns
  53  */
  54 function getRandomInteger (max = Number.MAX_SAFE_INTEGER, min = 0) {
  55   if (max < min || max < 0 || min < 0) {
  56     throw new RangeError('Invalid interval')
  57   }
  58   max = Math.floor(max)
  59   if (min !== 0) {
  60     min = Math.ceil(min)
  61     return Math.floor(Math.random() * (max - min + 1)) + min
  62   }
  63   return Math.floor(Math.random() * (max + 1))
  64 }
  65
  66 group('Random Integer Generator', () => {
  67   bench('Secure random integer generator', () => {
  68     getSecureRandomInteger(maximum)
  69   })
  70   bench('Secure random with getRandomValues() integer generator', () => {
  71     getSecureRandomIntegerWithRandomValues(maximum)
  72   })
  73   bench('Crypto random integer generator', () => {
  74     randomInt(maximum)
  75   })
  76   bench('Math random integer generator', () => {
  77     getRandomInteger(maximum)
  78   })
  79 })
  80
  81 await run({
  82   units: true
  83 })