公司域名是什么,seo的搜索排名影响因素主要有,我找客户做网站怎么说,注册网站建设开发google了好久都没有找到合适的#xff0c;其实我只需要一个函数#xff0c;能计算文件的 md5 值就好#xff0c;后来找到了 md5.h 和 md5.c 的源文件#xff0c;仿照别人的封装了个函数(他那个有问题#xff0c;和 md5sum 计算出来的都不一样)。废话少说#xff0c;直接贴…google了好久都没有找到合适的其实我只需要一个函数能计算文件的 md5 值就好后来找到了 md5.h 和 md5.c 的源文件仿照别人的封装了个函数(他那个有问题和 md5sum 计算出来的都不一样)。废话少说直接贴代码: (再废一句话如果只想计算字符串的md5值把字符串传给 MD5Update 函数一次就好示例github)#include md5.h#include #include #include #include #include #include #include #define READ_DATA_SIZE1024#define MD5_SIZE16#define MD5_STR_LEN(MD5_SIZE * 2)int Compute_file_md5(const char *file_path, char *value);int main(int argc, char *argv[]){int ret;const char *file_path temp;char md5_str[MD5_STR_LEN 1];ret Compute_file_md5(file_path, md5_str);if (0 ret){printf([file - %s] md5 value:\n, file_path);printf(%s\n, md5_str);}return 0;}int Compute_file_md5(const char *file_path, char *md5_str){int i;int fd;int ret;unsigned char data[READ_DATA_SIZE];unsigned char md5_value[MD5_SIZE];MD5_CTX md5;fd open(file_path, O_RDONLY);if (-1 fd){perror(open);return -1;}// init md5MD5Init(md5);while (1){ret read(fd, data, READ_DATA_SIZE);if (-1 ret){perror(read);return -1;}MD5Update(md5, data, ret);if (0 ret || ret READ_DATA_SIZE){break;}}close(fd);MD5Final(md5, md5_value);for(i 0; i MD5_SIZE; i){snprintf(md5_str i*2, 21, %02x, md5_value[i]);}md5_str[MD5_STR_LEN] \0; // add endreturn 0;}运行效果如下图附:md5.h 源码#ifndef MD5_H#define MD5_Htypedef 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);#endifmd5.c 源码:#include md5.h#include unsigned 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;unsigned int index 0;unsigned int 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; i64 inputlen; i64)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;unsigned int j 0;while(j len){output[j] input[i] 0xFF;output[j1] (input[i] 8) 0xFF;output[j2] (input[i] 16) 0xFF;output[j3] (input[i] 24) 0xFF;i;j 4;}}void MD5Decode(unsigned int *output, unsigned char *input, unsigned int len){unsigned int i 0;unsigned int j 0;while(j len){output[i] (input[j]) |(input[j1] 8) |(input[j2] 16) |(input[j3] 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;}
