这是国家标准加密算法C语言实现的SM4，这个已经在正式项目使用，效果不错。你懂得-This is the national standard encryption algorithm C language implementation SM4, this project has been in the official use, good results. you know

C实现的Sm4加解密算法，SM4算法是分组加密方法，每次加密16个字节的16进制数据(C implementation of the Sm4 encryption and decryption algorithm, SM4 algorithm is a block encryption method, each encrypted 16 bytes of 16 hexadecimal data)