linux下c md5函数

md5.h 和 md5.c 的源文件

得到文件的md5

得到字符串的MD5

基于openssl的MD5的函数

md5.h 和 md5.c 的源文件

//md5.h #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);#endif

//md5.c #include "md5.h"
#include <memory.h>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; 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;unsigned int 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;unsigned int 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;
}

得到文件的md5

#include "md5.h"#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>#define READ_DATA_SIZE  1024
#define MD5_SIZE        16
#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, 2+1, "%02x", md5_value[i]);}md5_str[MD5_STR_LEN] = '\0'; // add endreturn 0;
}

得到字符串的MD5

void get_str_md5(const char *str, char *md5_str)
{MD5_CTX md5;unsigned char md5_value[MD5_SIZE];int i=0;MD5Init(&md5);MD5Update(&md5, str, strlen(str));MD5Final(&md5, md5_value);for(i = 0; i < MD5_SIZE; i++){snprintf(md5_str + i*2, 2+1, "%02x", md5_value[i]);}md5_str[MD5_STR_LEN] = '\0'; // add end
}

基于openssl的MD5的函数

方法一：

#include<stdio.h>#include<openssl/md5.h>#include<string.h>int  main(  int  argc,  char  **argv ){MD5_CTX ctx;unsigned  char  *data= "123" ;unsigned  char  md[16];char  buf[33]={ '\0' };char  tmp[3]={ '\0' };int  i;MD5_Init(&ctx);MD5_Update(&ctx,data, strlen (data));MD5_Final(md,&ctx);for ( i=0; i<16; i++ ){sprintf (tmp, "%02X" ,md[i]);strcat (buf,tmp);}printf ( "%s\n" ,buf);return  0;}

输出：

202CB962AC59075B964B07152D234B70

方法二：

#include<stdio.h>#include<openssl/md5.h>#include<string.h>int  main(  int  argc,  char  **argv ){unsigned  char  *data =  "123" ;unsigned  char  md[16];int  i;char  tmp[3]={ '\0' },buf[33]={ '\0' };MD5(data, strlen (data),md);for  (i = 0; i < 16; i++){sprintf (tmp, "%2.2x" ,md[i]);strcat (buf,tmp);}printf ( "%s\n" ,buf);return  0;}

输出：

202cb962ac59075b964b07152d234b70

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linux下c md5函数

md5.h 和 md5.c 的源文件

得到文件的md5

得到字符串的MD5

基于openssl的MD5的函数

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