如何分析网站关键词,北京门户网站网址,互联网优化营销,关键词seo在Linux系统编程过程中#xff0c;经常遇到对文件做MD5校验的场景#xff0c;比如远程升级文件完整性校验#xff0c;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#xff0c;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;
}
