CryptoUtils.js

/**
 * Helper function that turns a string into a unique 53-bit hash.
 * @ref https://stackoverflow.com/a/52171480/6456163
 * @param {string} str
 * @param {number} seed
 * @returns {number}
 */
export const cyrb53 = (str, seed = 0) => {
  let h1 = 0xdeadbeef ^ seed, h2 = 0x41c6ce57 ^ seed;
  for (let i = 0, ch; i < str.length; i++) {
    ch = str.charCodeAt(i);
    h1 = Math.imul(h1 ^ ch, 2654435761);
    h2 = Math.imul(h2 ^ ch, 1597334677);
  }
  h1  = Math.imul(h1 ^ (h1 >>> 16), 2246822507);
  h1 ^= Math.imul(h2 ^ (h2 >>> 13), 3266489909);
  h2  = Math.imul(h2 ^ (h2 >>> 16), 2246822507);
  h2 ^= Math.imul(h1 ^ (h1 >>> 13), 3266489909);

  return 4294967296 * (2097151 & h2) + (h1 >>> 0);
};