分别利用复合域和PPRM结构实现了SM4 S-box，复合域实现方法具有资源消耗优势，但是功耗大，PPRM结构电路具有结构简单，功耗小的优势。 -Respectively by composite domain and PPRM structure enables SM4 S-box, composite domain implementation method has advantages in resources consumption, but power consumption, PPRM circuit structure has a simple structure, low power consumption advantages.