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C语言实现SM4加解密方式
目录C语言实现SM4加解密C语言文件加解密总结
C语言实现SM4加解密
简介：
sm4也是一种对称加密算法，使用16字节秘钥加解密16字节数据。
先生成32个32位子秘钥，数据再配合秘钥迭代计算数据32次，取最后四次生成的32位数据，倒序组合成128位结果。
使用到3张表，系统参数表，固定参数表，和sbox表。
128位秘钥拆分成4段32位，分别异或4个系统参数得到k1到k4，k5到k6分别依赖前4组秘钥使用固定算法所得.....过程可根据代码了解，流程比较简单。
tables.h
#ifndef_SM4_H_
#define_SM4_H_
#includestdio.h
#includestring.h
constunsignedlongTBL_SYS_PARAMS[4]={
??0xa3b1bac6,
??0x56aa3350,
??0x677d9197,
??0xb27022dc
constunsignedlongTBL_FIX_PARAMS[32]={
??0x00070e15,0x1c232a31,0x383f464d,0x545b6269,
??0x70777e85,0x8c939aa1,0xa8afb6bd,0xc4cbd2d9,
??0xe0e7eef5,0xfc030a11,0x181f262d,0x343b4249,
??0x50575e65,0x6c737a81,0x888f969d,0xa4abb2b9,
??0xc0c7ced5,0xdce3eaf1,0xf8ff060d,0x141b2229,
??0x30373e45,0x4c535a61,0x686f767d,0x848b9299,
??0xa0a7aeb5,0xbcc3cad1,0xd8dfe6ed,0xf4fb0209,
??0x10171e25,0x2c333a41,0x484f565d,0x646b7279
constunsignedcharTBL_SBOX[256]={
??0xd6,0x90,0xe9,0xfe,0xcc,0xe1,0x3d,0xb7,0x16,0xb6,0x14,0xc2,0x28,0xfb,0x2c,0x05,
??0x2b,0x67,0x9a,0x76,0x2a,0xbe,0x04,0xc3,0xaa,0x44,0x13,0x26,0x49,0x86,0x06,0x99,
??0x9c,0x42,0x50,0xf4,0x91,0xef,0x98,0x7a,0x33,0x54,0x0b,0x43,0xed,0xcf,0xac,0x62,
??0xe4,0xb3,0x1c,0xa9,0xc9,0x08,0xe8,0x95,0x80,0xdf,0x94,0xfa,0x75,0x8f,0x3f,0xa6,
??0x47,0x07,0xa7,0xfc,0xf3,0x73,0x17,0xba,0x83,0x59,0x3c,0x19,0xe6,0x85,0x4f,0xa8,
??0x68,0x6b,0x81,0xb2,0x71,0x64,0xda,0x8b,0xf8,0xeb,0x0f,0x4b,0x70,0x56,0x9d,0x35,
??0x1e,0x24,0x0e,0x5e,0x63,0x58,0xd1,0xa2,0x25,0x22,0x7c,0x3b,0x01,0x21,0x78,0x87,
??0xd4,0x00,0x46,0x57,0x9f,0xd3,0x27,0x52,0x4c,0x36,0x02,0xe7,0xa0,0xc4,0xc8,0x9e,
??0xea,0xbf,0x8a,0xd2,0x40,0xc7,0x38,0xb5,0xa3,0xf7,0xf2,0xce,0xf9,0x61,0x15,0xa1,
??0xe0,0xae,0x5d,0xa4,0x9b,0x34,0x1a,0x55,0xad,0x93,0x32,0x30,0xf5,0x8c,0xb1,0xe3,
??0x1d,0xf6,0xe2,0x2e,0x82,0x66,0xca,0x60,0xc0,0x29,0x23,0xab,0x0d,0x53,0x4e,0x6f,
??0xd5,0xdb,0x37,0x45,0xde,0xfd,0x8e,0x2f,0x03,0xff,0x6a,0x72,0x6d,0x6c,0x5b,0x51,
??0x8d,0x1b,0xaf,0x92,0xbb,0xdd,0xbc,0x7f,0x