docs: def get_server_public(self, password_verifier, server_private):
          """B = (k*v + g^b) % N
  
          :param int password_verifier:
          :param int server_private:
          :rtype: int
          """
          return ((self._mult * password_verifier) + pow(self._gen, server_private, self._prime)) % self._prime