获取文件的md5值

#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;

}