SM4_T_slow
SM4_RNDS(0, 1, 2, 3, SM4_T_slow);
SM4_RNDS(28, 29, 30, 31, SM4_T_slow);
SM4_RNDS(31, 30, 29, 28, SM4_T_slow);
SM4_RNDS(3, 2, 1, 0, SM4_T_slow);