(self, s, r)
Init the MAC with key = (S, R)
        :param s, r
        :return:
Init the MAC with key = (S, R)
        :param s, r
        :return:
Init the MAC with key = ( S R ) : param s r : return :
def _init_mac(self, s, r):
        """
        Init the MAC with key = (S, R)
        :param s, r
        :return:
        """
        key = self.tec_arithmetic.encode(s) + self.tec_arithmetic.encode(r)
        self.mac = Sha256MAC(key)
def _init_mac ( self , s , r ) : key = self . tec_arithmetic . encode ( s ) + self . tec_arithmetic . encode ( r ) self . mac = Sha256MAC ( key )