code: function(destUa, cryptowords) {
      for (let i = 0; i < destUa.length; i += 4) {
          let v = cryptowords.words[i / 4];
          if (v < 0) v += 0x100000000;
          destUa[i] = (v >>> 24);
          destUa[i + 1] = (v >>> 16) & 0xff;
          destUa[i + 2] = (v >>> 8) & 0xff;
          destUa[i + 3] = v & 0xff;
      }
      return destUa;
  }
docs: Convert a wordArray to Uint8Array
  
  @param {Uint8Array} destUa - A destination Uint8Array
  @param {WordArray} cryptowords - A wordArray
  
  @return {Uint8Array}