*#ifndef _SM4_H_ #define _SM4_H_ #include #include #include #define u8 unsigned char #define u32 unsigned long void four_uCh2uLong(u8* in, u32* out); //四字节转换成u32 void uLong2four_uCh(u32 in, u8* out); //u32转换成四字节 unsigned long move(u32 data, int length); //左移，保留丢弃位放置尾部 unsigned long func_key(u32 input); //先使用Sbox进行非线性变化，再将线性变换L置换为L' unsigned long func_data(u32 input); //先使用Sbox进行非线性变化，再进行线性变换L void print_hex(u8* data, int len); //无符号字符数组转16进制打印 void encode_fun(u8 len, u8* key, u8* input, u8* output); //加密函数 void decode_fun(u8 len, u8* key, u8* input, u8* output); //解密函数 /******************************定义系统参数FK的取值****************************************/ const u32 TBL_SYS_PARAMS[4] = { 0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc }; /******************************定义固定参数CK的取值****************************************/ const u32 TBL_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 }; /******************************SBox参数列表****************************************/ const u8 TBL_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,0x11,0xd9,0x5c,0x41,0x1f,0x10,0x5a,0xd8, 0x0a,0xc1,0x31,0x88,0xa5,0xcd,0x7b,0xbd,0x2d,0x74,0xd0,0x12,0xb8,0xe5,0xb4,0xb0, 0x89,0x69,0x97,0x4a,0x0c,0x96,0x77,0x7e,0x65,0xb9,0xf1,0x09,0xc5,0x6e,0xc6,0x84, 0x18,0xf0,0x7d,0xec,0x3a,0xdc,0x4d,0x20,0x79,0xee,0x5f,0x3e,0xd7,0xcb,0x39,0x48 }; #endif //4字节无符号数组转无符号long型 void four_uCh2uLong(u8* in, u32* out) { int i = 0; *out = 0; for (i = 0; i < 4; i++) *out = ((u32)in[i] << (24 - i * 8)) ^ *out; } //无符号long型转4字节无符号数组 void uLong2four_uCh(u32 in, u8* out) { int i = 0; //从32位unsigned long的高位开始取 for (i = 0; i < 4; i++) *(out + i) = (u32)(in >> (24 - i * 8)); } //左移，保留丢弃位放置尾部 u32 move(u32 data, int length) { u32 result = 0; result = (data << length) ^ (data >> (32 - length)); return result; } //秘钥处理函数,先使用Sbox进行非线性变化，再将线性变换L置换为L' u32 func_key(u32 input) { int i = 0; u32 ulTmp = 0; u8 ucIndexList[4] = { 0 }; u8 ucSboxValueList[4] = { 0 }; uLong2four_uCh(input, ucIndexList); for (i = 0; i < 4; i++) { ucSboxValueList[i] = TBL_SBOX[ucIndexList[i]]; } four_uCh2uLong(ucSboxValueList, &ulTmp); ulTmp = ulTmp ^ move(ulTmp, 13) ^ move(ulTmp, 23); return ulTmp; } //加解密数据处理函数,先使用Sbox进行非线性变化，再进行线性变换L u32 func_data(u32 input) { int i = 0; u32 ulTmp = 0; u8 ucIndexList[4] = { 0 }; u8 ucSboxValueList[4] = { 0 }; uLong2four_uCh(input, ucIndexList); for (i = 0; i < 4; i++) { ucSboxValueList[i] = TBL_SBOX[ucIndexList[i]]; } four_uCh2uLong(ucSboxValueList, &ulTmp); ulTmp = ulTmp ^ move(ulTmp, 2) ^ move(ulTmp, 10) ^ move(ulTmp, 18) ^ move(ulTmp, 24); return ulTmp; } //加密函数（可以加密任意长度数据，16字节为一次循环，不足部分补0凑齐16字节的整数倍） //len:数据长度(任意长度数据) key:密钥（16字节） input:输入的原始数据 output:加密后输出数据 void encode_fun(u8 len, u8* key, u8* input, u8* output) { int i = 0, j = 0; u8* p = (u8*)malloc(50); //定义一个50字节缓存区 u32 ulKeyTmpList[4] = { 0 }; //存储密钥的u32数据 u32 ulKeyList[36] = { 0 }; //用于密钥扩展算法与系统参数FK运算后的结果存储 u32 ulDataList[36] = { 0 }; //用于存放加密数据 /***************************开始生成子秘钥********************************************/ four_uCh2uLong(key, &(ulKeyTmpList[0])); four_uCh2uLong(key + 4, &(ulKeyTmpList[1])); four_uCh2uLong(key + 8, &(ulKeyTmpList[2])); four_uCh2uLong(key + 12, &(ulKeyTmpList[3])); ulKeyList[0] = ulKeyTmpList[0] ^ TBL_SYS_PARAMS[0]; ulKeyList[1] = ulKeyTmpList[1] ^ TBL_SYS_PARAMS[1]; ulKeyList[2] = ulKeyTmpList[2] ^ TBL_SYS_PARAMS[2]; ulKeyList[3] = ulKeyTmpList[3] ^ TBL_SYS_PARAMS[3]; for (i = 0; i < 32; i++) //32次循环迭代运算 { //5-36为32个子秘钥 ulKeyList[i + 4] = ulKeyList[i] ^ func_key(ulKeyList[i + 1] ^ ulKeyList[i + 2] ^ ulKeyList[i + 3] ^ TBL_FIX_PARAMS[i]); } /***********************************生成32轮32位长子秘钥结束**********************************/ for (i = 0; i < len; i++) //将输入数据存放在p缓存区 *(p + i) = *(input + i); for (i = 0; i < 16 - len % 16; i++)//将不足16位补0凑齐16的整数倍 *(p + len + i) = 0; for (j = 0; j < len / 16 + ((len % 16) ? 1 : 0); j++) //进行循环加密,并将加密后数据保存（可以看出此处是以16字节为一次加密，进行循环，即若16字节则进行一次，17字节补0至32字节后进行加密两次，以此类推） { /*开始处理加密数据*/ four_uCh2uLong(p + 16 * j, &(ulDataList[0])); four_uCh2uLong(p + 16 * j + 4, &(ulDataList[1])); four_uCh2uLong(p + 16 * j + 8, &(ulDataList[2])); four_uCh2uLong(p + 16 * j + 12, &(ulDataList[3])); //加密 for (i = 0; i < 32; i++) { ulDataList[i + 4] = ulDataList[i] ^ func_data(ulDataList[i + 1] ^ ulDataList[i + 2] ^ ulDataList[i + 3] ^ ulKeyList[i + 4]); } /*将加密后数据输出*/ uLong2four_uCh(ulDataList[35], output + 16 * j); uLong2four_uCh(ulDataList[34], output + 16 * j + 4); uLong2four_uCh(ulDataList[33], output + 16 * j + 8); uLong2four_uCh(ulDataList[32], output + 16 * j + 12); } free(p); } //解密函数（与加密函数基本一致，只是秘钥使用的顺序不同，即把钥匙反着用就是解密） //len:数据长度 key:密钥 input:输入的加密后数据 output:输出的解密后数据 void decode_fun(u8 len, u8* key, u8* input, u8* output) { int i = 0, j = 0; u32 ulKeyTmpList[4] = { 0 };//存储密钥的u32数据 u32 ulKeyList[36] = { 0 }; //用于密钥扩展算法与系统参数FK运算后的结果存储 u32 ulDataList[36] = { 0 }; //用于存放加密数据 /*开始生成子秘钥*/ four_uCh2uLong(key, &(ulKeyTmpList[0])); four_uCh2uLong(key + 4, &(ulKeyTmpList[1])); four_uCh2uLong(key + 8, &(ulKeyTmpList[2])); four_uCh2uLong(key + 12, &(ulKeyTmpList[3])); ulKeyList[0] = ulKeyTmpList[0] ^ TBL_SYS_PARAMS[0]; ulKeyList[1] = ulKeyTmpList[1] ^ TBL_SYS_PARAMS[1]; ulKeyList[2] = ulKeyTmpList[2] ^ TBL_SYS_PARAMS[2]; ulKeyList[3] = ulKeyTmpList[3] ^ TBL_SYS_PARAMS[3]; for (i = 0; i < 32; i++) //32次循环迭代运算 { //5-36为32个子秘钥 ulKeyList[i + 4] = uKleyList[i] ^ func_key(ulKeyList[i + 1] ^ ulKeyList[i + 2] ^ ulKeyList[i + 3] ^ TBL_FIX_PARAMS[i]); } /*生成32轮32位长子秘钥结束*/ for (j = 0; j < len / 16; j++) //进行循环加密,并将加密后数据保存 { /*开始处理解密数据*/ four_uCh2uLong(input + 16 * j, &(ulDataList[0])); four_uCh2uLong(input + 16 * j + 4, &(ulDataList[1])); four_uCh2uLong(input + 16 * j + 8, &(ulDataList[2])); four_uCh2uLong(input + 16 * j + 12, &(ulDataList[3])); //解密 for (i = 0; i < 32; i++) { ulDataList[i + 4] = ulDataList[i] ^ func_data(ulDataList[i + 1] ^ ulDataList[i + 2] ^ ulDataList[i + 3] ^ ulKeyList[35 - i]);//与加密唯一不同的就是轮密钥的使用顺序 } /*将解密后数据输出*/ uLong2four_uCh(ulDataList[35], output + 16 * j); uLong2four_uCh(ulDataList[34], output + 16 * j + 4); uLong2four_uCh(ulDataList[33], output + 16 * j + 8); uLong2four_uCh(ulDataList[32], output + 16 * j + 12); } } //无符号字符数组转16进制打印 void print_hex(u8* data, int len) { int i = 0; char alTmp[16] = { '0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f' }; for (i = 0; i < len; i++) { printf("%c", alTmp[data[i] / 16]); printf("%c", alTmp[data[i] % 16]); putchar(' '); } putchar('\n'); } /*在主函数中实现任意字节加密与解密，并且结果正确*/ int main(void) { u8 i, len; u8 encode_Result[50] = { 0 }; //定义加密输出缓存区 u8 decode_Result[50] = { 0 }; //定义解密输出缓存区 u8 key[16] = { 0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef,0xfe,0xdc,0xba,0x98,0x76,0x54,0x32,0x10 }; //定义16字节的密钥 //u8 Data_plain[18] = { 0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef,0xfe,0xdc,0xba,0x98,0x76,0x54,0x32,0x10,0x01,0x23 };//定义18字节的原始输入数据（测试用） //u8 Data_plain[32] = { 0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef,0xfe,0xdc,0xba,0x98,0x76,0x54,0x32,0x10,0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef,0xfe,0xdc,0xba,0x98,0x76,0x54,0x32,0x10 };//定义32字节的原始输入数据（测试用） u8 Data_plain[16] = { 0x01,0x23,0,0,0,0,0,0,0,0,0,0,0,0,0,0 };//定义16字节的原始输入数据（测试用） len = 16 * (sizeof(Data_plain) / 16) + 16 * ((sizeof(Data_plain) % 16) ? 1 : 0);//得到扩充后的字节数（解密函数会用到） decode_fun(len, key, Data_plain, decode_Result); //数据解密 printf("解密后数据是：\n"); for (i = 0; i < len; i++) printf("%x ", *(decode_Result + i)); system("pause"); return 0; }