potluckgame

const isaac = require('isaac'); // https://github.com/rubycon/isaac.js
/**
 * generate a random number using isaac RNG
 * @param {String} seed - the seed for isaac RNG
 * @returns {Number} Random number between 0.0 and 1.0
*/
function isaacRandom(seed) {
  isaac.seed(seed);
  return isaac.random();
}

potluckgame

const Bluebird = require('bluebird');

/**
 * Create a `sha256` hash of the seed.
 * @param {String} seed - Previous server `seed`
 * @returns {String} `sha256` hash of the `seed`
*/
function createHash(seed) {
  return crypto.createHash('sha256').update(seed).digest('hex');
}