code: def __make_hash(cls, innermsg, token, seqnum):
          
          hobj = hmacNew(token, digestmod=hashfunc)
          hobj.update(innermsg)
          hobj.update(cls.__byte_packer(seqnum))
          return hobj.digest()
docs: return the hash for this innermsg, token, seqnum
          return digest bytes