/**

 * lsflib/src/md5sum.c

 * Copyright (C) 2008 Markus Broeker

 */

#include <stdio.h>

#include <string.h>

#include <openssl/evp.h>

#include <lsf.h>

unsigned char *md5sum (char *fname)

{

    EVP_MD_CTX mdctx;

    const EVP_MD *md;

    char line[81];

    unsigned char md_value[EVP_MAX_MD_SIZE];

    int md_len, i;

    FILE *f;

    static unsigned char *value = NULL;

    OpenSSL_add_all_digests ();

    if ((f = fopen (fname, "rb")) == NULL) {

        perror ("FOPEN");

        value = malloc (1);

        value = 0;

        return value;

    }

    if ((md = EVP_get_digestbyname ("md5")) == NULL) {

        value = malloc (1);

        value = 0;

        return value;

    }

    EVP_MD_CTX_init (&mdctx);

    EVP_DigestInit_ex (&mdctx, md, NULL);

    *line = 0;

    while ((i = fread (line, 1, 80, f)) != 0) {

        EVP_DigestUpdate (&mdctx, line, i);

    }

    fclose (f);

    EVP_DigestFinal_ex (&mdctx, md_value, (unsigned int *)&md_len);

    EVP_MD_CTX_cleanup (&mdctx);

    value = malloc (md_len + 1);

    for (i = 0; i < md_len; i++)

        value[i] = md_value[i];

    value[i] = 0;

    return value;

}