Hash utils

hash-utils.js

// Generate a random hex string of the specified length
var randomHashReadable = function(length = 32) {
  const hashLength = Math.ceil(length / 2);
  const buffer = crypto.getRandomValues(new Uint8Array(hashLength));
  const hex = [].slice.call(buffer).map(val => val.toString(16).padStart(2, '0'));
  return hex.join('').substring(0, length);
};

var randomHash = (length = 32) => {
  return hex = [].slice.call(crypto.getRandomValues(new Uint8Array(Math.ceil(length / 2)))).map(val => val.toString(16).padStart(2, '0')).join('').substring(0, length);
};

randomHash(32).then(log);

// =========================================================

// SHA 256 hash a given strinhg
var sha256 = function(str) {
  if (typeof str !== 'string') {
    throw new TypeError('Parameter must be a string');
  }

  var bytes = new Uint8Array(str.length);
  for (var i = 0; i < str.length; i++) {
      bytes[i] = str.charCodeAt(i);
  }

  return crypto.subtle.digest('SHA-256', bytes)
    .then(buffer => {
      let dv = new DataView(buffer);
      const arr = new Array(dv.byteLength);
      for(let i = 0; i < dv.byteLength; i++) {
        arr[i] = dv.getUint8(i).toString(16).padStart(2, '0');
      }
      return arr.join('')
    });
}

sha256('hello world').then(log);