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自己做网站申请域名,太原企业网站建设,商丘网上房地产查询系统,宿松网站建设推荐秒搜科技在Linux系统编程过程中，经常遇到对文件做MD5校验的场景，比如远程升级文件完整性校验，开机启动程序完整性校验等。这些动作在完整的Linux系统中比较好实现，直接安装openssl第三方库即可。但是往往在开发中我们都需要在MCU上进行开发…

在Linux系统编程过程中，经常遇到对文件做MD5校验的场景，比如远程升级文件完整性校验，开机启动程序完整性校验等。这些动作在完整的Linux系统中比较好实现，直接安装openssl第三方库即可。但是往往在开发中我们都需要在MCU上进行开发，这里没有完整的LInux系统，无法安装openssl第三方库。这个时候就可以考虑程序集成MD5算法来做MD5校验。

接口

对字符串做MD5校验

getMd5()函数用于生成32位MD5密钥，其函数原型为：

char * getMd5(unsigned char* str)
{if (str == NULL) return NULL;unsigned char md5[16] = {0};MD5_CTX md5_ctx;MD5Init(&md5_ctx);         		MD5Update(&md5_ctx, str, strlen((char *)str));MD5Final(&md5_ctx, md5);int offset = 0;char * buff = (char *)malloc(33);memset(buff, 0, 33);for (int i = 0; i < 16; i++)offset += sprintf(buff + offset, "%02x", md5[i]);buff[offset] = '\0';return buff;
}

该函数接收一个字符串作为参数，返回生成的MD5密钥，该密钥动态分配内存，使用完毕之后需要手动进行释放。

getMd5_16()用于生成16位MD5密钥，其函数原型为：

char * getMd5_16(unsigned char * str)
{if (str == NULL) return NULL;unsigned char md5[16] = {0};MD5_CTX md5_ctx;MD5Init(&md5_ctx);MD5Update(&md5_ctx, str, strlen((char *)str));MD5Final(&md5_ctx, md5);char * result = (char *)malloc(17);sprintf(result, "%02x%02x%02x%02x%02x%02x%02x%02x", md5[4], md5[5], md5[6], md5[7], md5[8], md5[9], md5[10], md5[11]);return result;
}

该函数接收一个字符串作为参数，返回生成的MD5密钥，该密钥动态分配内存，使用完毕之后需要手动进行释放。

对文件做MD5校验

getFileMD5()函数用于对文件做MD5校验，其函数原型为：

char * getFileMD5(const char * filename) 
{unsigned char buffer[1024];unsigned char digest[16];unsigned char * md5 = (unsigned char *)malloc(33);FILE *file = fopen(filename, "rb");if (file == NULL) {printf("无法打开文件： %s", filename);return NULL;}MD5_CTX ctx;MD5Init(&ctx);while (fread(buffer, 1, sizeof(buffer), file) > 0) {MD5Update(&ctx, buffer, sizeof(buffer));}MD5Final(&ctx, digest);fclose(file);for (int i = 0; i < MD5_DIGEST_LENGTH; i++) {sprintf(md5 + (i * 2), "%02x", digest[i]);}md5[32] = '\0';return md5;
}

该函数接收一个字符串作为参数，一般为文件的完整路径，返回生成的MD5密钥，该密钥动态分配内存，使用完毕之后需要手动进行释放。

头文件

md5.h

#ifndef __MD5_H__
#define __MD5_H__typedef struct
{unsigned int count[2];unsigned int state[4];unsigned char buffer[64];
}MD5_CTX;#define F(x,y,z) ((x & y) | (~x & z))
#define G(x,y,z) ((x & z) | (y & ~z))
#define H(x,y,z) (x^y^z)
#define I(x,y,z) (y ^ (x | ~z))
#define ROTATE_LEFT(x,n) ((x << n) | (x >> (32-n)))
#define FF(a,b,c,d,x,s,ac) \{ \a += F(b,c,d) + x + ac; \a = ROTATE_LEFT(a,s); \a += b; \}
#define GG(a,b,c,d,x,s,ac) \{ \a += G(b,c,d) + x + ac; \a = ROTATE_LEFT(a,s); \a += b; \}
#define HH(a,b,c,d,x,s,ac) \{ \a += H(b,c,d) + x + ac; \a = ROTATE_LEFT(a,s); \a += b; \}
#define II(a,b,c,d,x,s,ac) \{ \a += I(b,c,d) + x + ac; \a = ROTATE_LEFT(a,s); \a += b; \}                                            
void MD5Init(MD5_CTX *context);
void MD5Update(MD5_CTX *context, unsigned char *input, unsigned int inputlen);
void MD5Final(MD5_CTX *context, unsigned char digest[16]);
void MD5Transform(unsigned int state[4], unsigned char block[64]);
void MD5Encode(unsigned char *output, unsigned int *input, unsigned int len);
void MD5Decode(unsigned int *output, unsigned char *input, unsigned int len);
char * getMd5(unsigned char * str);
char * getMd5_16(unsigned char * str);
char * getFileMD5(const char *filename);
#endif

源码

md5.c

#include <memory.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "md5.h"#define MD5_DIGEST_LENGTH 16unsigned char PADDING[] = { 0x80,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 };void MD5Init(MD5_CTX *context)
{context->count[0] = 0;context->count[1] = 0;context->state[0] = 0x67452301;context->state[1] = 0xEFCDAB89;context->state[2] = 0x98BADCFE;context->state[3] = 0x10325476;
}
void MD5Update(MD5_CTX *context, unsigned char *input, unsigned int inputlen)
{unsigned int i = 0, index = 0, partlen = 0;index = (context->count[0] >> 3) & 0x3F;partlen = 64 - index;context->count[0] += inputlen << 3;if (context->count[0] < (inputlen << 3))context->count[1]++;context->count[1] += inputlen >> 29;if (inputlen >= partlen){memcpy(&context->buffer[index], input, partlen);MD5Transform(context->state, context->buffer);for (i = partlen; i + 64 <= inputlen; i += 64)MD5Transform(context->state, &input[i]);index = 0;}else{i = 0;}memcpy(&context->buffer[index], &input[i], inputlen - i);
}
void MD5Final(MD5_CTX *context, unsigned char digest[16])
{unsigned int index = 0, padlen = 0;unsigned char bits[8];index = (context->count[0] >> 3) & 0x3F;padlen = (index < 56) ? (56 - index) : (120 - index);MD5Encode(bits, context->count, 8);MD5Update(context, PADDING, padlen);MD5Update(context, bits, 8);MD5Encode(digest, context->state, 16);
}
void MD5Encode(unsigned char *output, unsigned int *input, unsigned int len)
{unsigned int i = 0, j = 0;while (j < len){output[j] = input[i] & 0xFF;output[j + 1] = (input[i] >> 8) & 0xFF;output[j + 2] = (input[i] >> 16) & 0xFF;output[j + 3] = (input[i] >> 24) & 0xFF;i++;j += 4;}
}
void MD5Decode(unsigned int *output, unsigned char *input, unsigned int len)
{unsigned int i = 0, j = 0;while (j < len){output[i] = (input[j]) |(input[j + 1] << 8) |(input[j + 2] << 16) |(input[j + 3] << 24);i++;j += 4;}
}
void MD5Transform(unsigned int state[4], unsigned char block[64])
{unsigned int a = state[0];unsigned int b = state[1];unsigned int c = state[2];unsigned int d = state[3];unsigned int x[64];MD5Decode(x, block, 64);FF(a, b, c, d, x[0], 7, 0xd76aa478); /* 1 */FF(d, a, b, c, x[1], 12, 0xe8c7b756); /* 2 */FF(c, d, a, b, x[2], 17, 0x242070db); /* 3 */FF(b, c, d, a, x[3], 22, 0xc1bdceee); /* 4 */FF(a, b, c, d, x[4], 7, 0xf57c0faf); /* 5 */FF(d, a, b, c, x[5], 12, 0x4787c62a); /* 6 */FF(c, d, a, b, x[6], 17, 0xa8304613); /* 7 */FF(b, c, d, a, x[7], 22, 0xfd469501); /* 8 */FF(a, b, c, d, x[8], 7, 0x698098d8); /* 9 */FF(d, a, b, c, x[9], 12, 0x8b44f7af); /* 10 */FF(c, d, a, b, x[10], 17, 0xffff5bb1); /* 11 */FF(b, c, d, a, x[11], 22, 0x895cd7be); /* 12 */FF(a, b, c, d, x[12], 7, 0x6b901122); /* 13 */FF(d, a, b, c, x[13], 12, 0xfd987193); /* 14 */FF(c, d, a, b, x[14], 17, 0xa679438e); /* 15 */FF(b, c, d, a, x[15], 22, 0x49b40821); /* 16 *//* Round 2 */GG(a, b, c, d, x[1], 5, 0xf61e2562); /* 17 */GG(d, a, b, c, x[6], 9, 0xc040b340); /* 18 */GG(c, d, a, b, x[11], 14, 0x265e5a51); /* 19 */GG(b, c, d, a, x[0], 20, 0xe9b6c7aa); /* 20 */GG(a, b, c, d, x[5], 5, 0xd62f105d); /* 21 */GG(d, a, b, c, x[10], 9, 0x2441453); /* 22 */GG(c, d, a, b, x[15], 14, 0xd8a1e681); /* 23 */GG(b, c, d, a, x[4], 20, 0xe7d3fbc8); /* 24 */GG(a, b, c, d, x[9], 5, 0x21e1cde6); /* 25 */GG(d, a, b, c, x[14], 9, 0xc33707d6); /* 26 */GG(c, d, a, b, x[3], 14, 0xf4d50d87); /* 27 */GG(b, c, d, a, x[8], 20, 0x455a14ed); /* 28 */GG(a, b, c, d, x[13], 5, 0xa9e3e905); /* 29 */GG(d, a, b, c, x[2], 9, 0xfcefa3f8); /* 30 */GG(c, d, a, b, x[7], 14, 0x676f02d9); /* 31 */GG(b, c, d, a, x[12], 20, 0x8d2a4c8a); /* 32 *//* Round 3 */HH(a, b, c, d, x[5], 4, 0xfffa3942); /* 33 */HH(d, a, b, c, x[8], 11, 0x8771f681); /* 34 */HH(c, d, a, b, x[11], 16, 0x6d9d6122); /* 35 */HH(b, c, d, a, x[14], 23, 0xfde5380c); /* 36 */HH(a, b, c, d, x[1], 4, 0xa4beea44); /* 37 */HH(d, a, b, c, x[4], 11, 0x4bdecfa9); /* 38 */HH(c, d, a, b, x[7], 16, 0xf6bb4b60); /* 39 */HH(b, c, d, a, x[10], 23, 0xbebfbc70); /* 40 */HH(a, b, c, d, x[13], 4, 0x289b7ec6); /* 41 */HH(d, a, b, c, x[0], 11, 0xeaa127fa); /* 42 */HH(c, d, a, b, x[3], 16, 0xd4ef3085); /* 43 */HH(b, c, d, a, x[6], 23, 0x4881d05); /* 44 */HH(a, b, c, d, x[9], 4, 0xd9d4d039); /* 45 */HH(d, a, b, c, x[12], 11, 0xe6db99e5); /* 46 */HH(c, d, a, b, x[15], 16, 0x1fa27cf8); /* 47 */HH(b, c, d, a, x[2], 23, 0xc4ac5665); /* 48 *//* Round 4 */II(a, b, c, d, x[0], 6, 0xf4292244); /* 49 */II(d, a, b, c, x[7], 10, 0x432aff97); /* 50 */II(c, d, a, b, x[14], 15, 0xab9423a7); /* 51 */II(b, c, d, a, x[5], 21, 0xfc93a039); /* 52 */II(a, b, c, d, x[12], 6, 0x655b59c3); /* 53 */II(d, a, b, c, x[3], 10, 0x8f0ccc92); /* 54 */II(c, d, a, b, x[10], 15, 0xffeff47d); /* 55 */II(b, c, d, a, x[1], 21, 0x85845dd1); /* 56 */II(a, b, c, d, x[8], 6, 0x6fa87e4f); /* 57 */II(d, a, b, c, x[15], 10, 0xfe2ce6e0); /* 58 */II(c, d, a, b, x[6], 15, 0xa3014314); /* 59 */II(b, c, d, a, x[13], 21, 0x4e0811a1); /* 60 */II(a, b, c, d, x[4], 6, 0xf7537e82); /* 61 */II(d, a, b, c, x[11], 10, 0xbd3af235); /* 62 */II(c, d, a, b, x[2], 15, 0x2ad7d2bb); /* 63 */II(b, c, d, a, x[9], 21, 0xeb86d391); /* 64 */state[0] += a;state[1] += b;state[2] += c;state[3] += d;
}char * getMd5(unsigned char* str)
{if (str == NULL) return NULL;unsigned char md5[16] = {0};MD5_CTX md5_ctx;MD5Init(&md5_ctx);         		MD5Update(&md5_ctx, str, strlen((char *)str));MD5Final(&md5_ctx, md5);int offset = 0;char * buff = (char *)malloc(33);memset(buff, 0, 33);for (int i = 0; i < 16; i++)offset += sprintf(buff + offset, "%02x", md5[i]);buff[offset] = '\0';return buff;
}char * getMd5_16(unsigned char * str)
{if (str == NULL) return NULL;unsigned char md5[16] = {0};MD5_CTX md5_ctx;MD5Init(&md5_ctx);MD5Update(&md5_ctx, str, strlen((char *)str));MD5Final(&md5_ctx, md5);char * result = (char *)malloc(17);sprintf(result, "%02x%02x%02x%02x%02x%02x%02x%02x", md5[4], md5[5], md5[6], md5[7], md5[8], md5[9], md5[10], md5[11]);return result;
}char * getFileMD5(const char *filename) 
{unsigned char buffer[1024];unsigned char digest[16];unsigned char * md5 = (unsigned char *)malloc(33);FILE *file = fopen(filename, "rb");if (file == NULL) {printf("无法打开文件： %s", filename);return NULL;}MD5_CTX ctx;MD5Init(&ctx);while (fread(buffer, 1, sizeof(buffer), file) > 0) {MD5Update(&ctx, buffer, sizeof(buffer));}MD5Final(&ctx, digest);fclose(file);for (int i = 0; i < MD5_DIGEST_LENGTH; i++) {sprintf(md5 + (i * 2), "%02x", digest[i]);}md5[32] = '\0';return md5;
}