lsflib/src/md5sum.c
author Markus Bröker <mbroeker@largo.dyndns.tv>
Sat, 13 Dec 2008 17:58:06 +0100
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clear() is better than resize(0) committer: Markus Bröker <mbroeker@largo.homelinux.org>
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/**
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 * test/demos/lsflib/src/md5sum.c
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 * Copyright (C) 2008 Markus Broeker
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 */
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#include <stdio.h>
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#include <string.h>
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#include <openssl/evp.h>
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#include <lsf.h>
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unsigned char *md5sum (char *fname)
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{
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    EVP_MD_CTX mdctx;
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    const EVP_MD *md;
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    char line[81];
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    unsigned char md_value[EVP_MAX_MD_SIZE];
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    int md_len, i;
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    FILE *f;
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    static unsigned char *value = NULL;
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    OpenSSL_add_all_digests ();
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    if ((f = fopen (fname, "rb")) == NULL) {
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        perror ("FOPEN");
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        value = malloc (1);
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        value = 0;
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        return value;
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    }
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    if ((md = EVP_get_digestbyname ("md5")) == NULL) {
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        value = malloc (1);
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        value = 0;
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        return value;
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    }
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    EVP_MD_CTX_init (&mdctx);
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    EVP_DigestInit_ex (&mdctx, md, NULL);
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    *line = 0;
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    while ((i = fread (line, 1, 80, f)) != 0) {
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        EVP_DigestUpdate (&mdctx, line, i);
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    }
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    fclose (f);
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    EVP_DigestFinal_ex (&mdctx, md_value, (unsigned int *)&md_len);
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    EVP_MD_CTX_cleanup (&mdctx);
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    value = malloc (md_len + 1);
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    for (i = 0; i < md_len; i++)
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        value[i] = md_value[i];
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    value[i] = 0;
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    return value;
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}