Power-aware hiding (PAH) is a low power and anti-power-analysis method. It shows the advantages in terms of security and energy efficiency when used for S box protection of AES algorithm. SM4 is a special block cipher algorithm designed independently in our country

and the protection of side channel attacks is also needed in the implementation of the chip. In this paper

the S box of SM4 algorithm is designed and implemented by using PAH method. The compensation scheme for SM4 algorithm is designed and the design flow of automation is given. The PAH technology is extended to the S-box of SM4 algorithm. The post-layout simulation results show that the power delay product of the implemented SM4 S box is 76% lower than other methods. And the security is similar to that of the AES S-box circuit. The generality of the PAH method is proved.