Java's UUID.nameUUIDFromBytes to written in JavaScript?

Question

I have a 3rd party application that I can\'t control that uses Java\'s UUID.nameUUIDFromBytes to create a string. I need to reproduce this function written in J

Answer 1

This answer attempts to improve on the previous ones as follows

• It includes the hyphens in the output, just like Java
• Does not rely on additional external libraries that are not supported anymore

const crypto = require('crypto');

function javaHash(input:string) {
  let md5Bytes = crypto.createHash('md5').update(input).digest();
  md5Bytes[6]  &= 0x0f;  /* clear version        */
  md5Bytes[6]  |= 0x30;  /* set to version 3     */
  md5Bytes[8]  &= 0x3f;  /* clear variant        */
  md5Bytes[8]  |= 0x80;  /* set to IETF variant  */
  const hex = md5Bytes.toString('hex')
  const uuid = hex.replace(/(\w{8})(\w{4})(\w{4})(\w{4})(\w{12})/, "$1-$2-$3-$4-$5");
  return uuid;
}

It relies on the UUID spec being exactly 128bits in length