Pseudorandom number generator based on crypto.randomBytes

prng.js

var crypto = require('crypto')
  , rrange = 4294967296;

/**
 * Return an integer, pseudo-random number in the range [0, 2^32).
 */

var nextInt = function() {
  return crypto.randomBytes(4).readUInt32BE(0);
};

/**
 * Return a floating-point, pseudo-random number in the range [0, 1).
 */

var rand = function() {
  return nextInt() / rrange;
};

/**
 * Return an integer, pseudo-random number in the range [min, max].
 */

var randInt = function(min, max) {
  if (typeof min === 'undefined') {
    return nextInt();
  }
  if (typeof max === 'undefined') {
    max = min;
    min = 0;
  }
  return min + Math.floor(rand() * (max - min + 1));
};

exports.rand = rand;
exports.randInt = randInt;