md5 by openssl

Makefile

gcc -std=gnu99 -o sslmd5 sslmd5.c -I/home/work/public/third-64/openssl/include -L/home/work/public/third-64/openssl/include -lcrypto

sslmd5.c

#include <errno.h>
#include <limits.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include<openssl/md5.h>

int main(int argc, char *argv[])
{
    if (argc < 2) {
        fprintf(stderr, "Target required\n");
        return 1;
    }

    /* Open file and read, then call MD5 */

    FILE *pf = fopen(argv[1], "r");
    if (pf == NULL) {
        perror("Open file: ");
        exit(1);
    }

    char msg[SHRT_MAX * CHAR_MAX];
    size_t len = fread(msg, sizeof(char), SHRT_MAX * CHAR_MAX, pf);
    if (errno != 0) {
        perror("read file: ");
        fclose(pf);
        exit(1);
    }
    fclose(pf);

    uint8_t result[16];
    MD5((uint8_t*) msg,len, result);
    for (int i = 0; i < 16; i++)
        printf("%2.2x", result[i]);
    puts("");

    return EXIT_SUCCESS;
}