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_#include <stdio.h>
#include <string.h>const unsigned long TBL_SYS_PARAMS[4] = {0xa3b1bac6,0x56aa3350,0x677d9197,0xb27022dc
};const unsigned long 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
};const unsigned char 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

sm4_tool.c

#include "tables.h"void four_uCh2uLong(unsigned char *in , unsigned long *out);
void uLong2four_uCh(unsigned long in , unsigned char *out);
unsigned long move(unsigned long data , int length);
unsigned long func_key(unsigned long input);
unsigned long func_data(unsigned long input);
int proc_enc_dec(char *type , unsigned char *key , unsigned char *input , unsigned char *output);
void print_hex(unsigned char *data , int len);
int hex_str2bytes(unsigned char *in ,  unsigned char *out , int *outLen);//4字节无符号数组转无符号long型
void four_uCh2uLong(unsigned char *in , unsigned long *out)
{int i = 0;*out = 0;for(i = 0 ; i < 4 ; i++)*out = ((unsigned long)in[i] << (24-i*8)) ^ *out;
}//无符号long型转4字节无符号数组
void uLong2four_uCh(unsigned long in , unsigned char *out)
{int i = 0;//从32位unsigned long的高位开始取for(i = 0 ; i < 4 ; i++)*(out+i) = (unsigned char )(in >> (24-i*8));
}//左移，保留丢弃位放置尾部
unsigned long move(unsigned long data , int length)
{unsigned long result = 0;result = (data << length) ^ (data >> (32-length));return result;
}//秘钥处理函数
unsigned long func_key(unsigned long input)
{int i = 0;unsigned long ulTmp = 0;unsigned char ucIndexList[4] = {0};unsigned char 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
unsigned long func_data(unsigned long input)
{int i = 0;unsigned long ulTmp = 0;unsigned char ucIndexList[4] = {0};unsigned char 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;
}//加解密函数
int proc_enc_dec(char *type , unsigned char *key , unsigned char *input , unsigned char *output)
{int i = 0;unsigned long ulKeyTmpList[4] = {0};unsigned long ulKeyList[36] = {0};unsigned long ulDataList[36] = {0};/*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++){//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*//*开始处理加解密数据*/four_uCh2uLong(input , &(ulDataList[0]));four_uCh2uLong(input+4 , &(ulDataList[1]));four_uCh2uLong(input+8 , &(ulDataList[2]));four_uCh2uLong(input+12 , &(ulDataList[3]));if(strcmp(type , "1") == 0){//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]);}}else if(strcmp(type , "2") == 0){//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]);}}uLong2four_uCh(ulDataList[35] , output);uLong2four_uCh(ulDataList[34] , output+4);uLong2four_uCh(ulDataList[33] , output+8);uLong2four_uCh(ulDataList[32] , output+12);return 0;
}//无符号字符数组转16进制打印
void print_hex(unsigned char *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');
}//16进制数组转无符号字符数组
int hex_str2bytes(unsigned char *in ,  unsigned char *out , int *outLen)
{int i = 0 , j = 0;int num = 0;int tmp = 0;for (i = 0 ; i < strlen((char *)in) ; i++){if(in[i] < 58 && in[i] > 47) //0-9tmp = in[i]-48;else if(in[i] < 71 && in[i] > 64) //A-Ftmp = 10+in[i]-65;else if(in[i] < 103 && in[i] > 96) //a-ftmp = 10+in[i]-97;else{printf("Invalid arg!\n");return -1;}if(i%2 == 0)num = tmp*16;else{num += tmp;out[j++] = num;}}*outLen = j;return 0;
}int main(int argc , char **argv)
{unsigned char alResult[16] = {0};unsigned char alKey[16] = {0};int ilKeyLen = 0;unsigned char alData[16] = {0};int ilDataLen = 0;if(argc != 4 || strlen(argv[2]) != 32 || strlen(argv[3]) != 32 || (strcmp(argv[1] , "1") != 0 && strcmp(argv[1] , "2") != 0) ){printf("Usage: ./sm4_tool  [1/2]  hex32_key  hex32_data\n1:encrypt , 2:decrypt\n");return -1;}if(hex_str2bytes((unsigned char *)argv[2] , alKey , &ilKeyLen))return -1;if(hex_str2bytes((unsigned char *)argv[3] , alData, &ilDataLen))return -1;proc_enc_dec(argv[1] , alKey , alData , alResult);print_hex(alResult , 16);return 0;
}

Makefile：

TARGET = sm4_tool
DEPEND = sm4_tool.o
CC = gcc -g -Wall
RM = rm -f.c.o :$(CC) -c $^ -o $@$(TARGET) : $(DEPEND)$(CC) $^ -o $@.PHONY : clean
clean :$(RM) $(TARGET) *.o

这里main函数参数只针对16字节秘钥和16字节数据测试用。

加密：./sm4_tool 1 0123456789abcdeffedcba9876543210 0123456789abcdeffedcba9876543210
结果：681edf34d206965e86b3e94f536e4246

解密：./sm4_tool 2 0123456789abcdeffedcba9876543210 681edf34d206965e86b3e94f536e4246
结果：0123456789abcdeffedcba9876543210

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