brorand-nodejs/index.js

Random number generator for browsers and node.js

var r;

module.exports = function rand(len) {
  if (!r)
    r = new Rand(null);

  return r.generate(len);
};

function Rand(rand) {
  this.rand = rand;
}
module.exports.Rand = Rand;

Rand.prototype.generate = function generate(len) {
  return this._rand(len);
};
// Emulate crypto API using randy
Rand.prototype._rand = function _rand(n) {
  if (this.rand.getBytes)
    return this.rand.getBytes(n);

  var res = new Uint8Array(n);
  for (var i = 0; i < res.length; i++)
    res[i] = this.rand.getByte();
  return res;
};

try {
  var crypto = require('crypto');
  if (typeof crypto.randomBytes !== 'function')
    throw new Error('Not supported');

  Rand.prototype._rand = function _rand(n) {
    return crypto.randomBytes(n);
  };
} catch (e) {
}