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calculate and check hash of downloaded file

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This commit is contained in:
josch
2014-11-05 13:40:25 +01:00
parent 254aaa6033
commit 511cda2c8f
6 changed files with 210 additions and 7 deletions
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62
utils/hash.c Normal file
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/*
* Copyright (C) 2014 Johannes Schauer <j.schauer@email.de>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2, as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <openssl/sha.h>
#include <openssl/md5.h>
#define bufsize 32768
int calc_md5(FILE * file, unsigned char *hash)
{
int bytesRead;
char *buffer;
MD5_CTX md5;
MD5_Init(&md5);
buffer = malloc(bufsize);
if (buffer == NULL) {
return -1;
}
while ((bytesRead = fread(buffer, 1, bufsize, file))) {
MD5_Update(&md5, buffer, bytesRead);
}
MD5_Final(hash, &md5);
free(buffer);
return 0;
}
int calc_sha256(FILE * file, unsigned char *hash)
{
int bytesRead;
char *buffer;
SHA256_CTX sha256;
SHA256_Init(&sha256);
buffer = malloc(bufsize);
if (buffer == NULL) {
return -1;
}
while ((bytesRead = fread(buffer, 1, bufsize, file))) {
SHA256_Update(&sha256, buffer, bytesRead);
}
SHA256_Final(hash, &sha256);
free(buffer);
return 0;
}

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utils/hash.h Normal file
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/*
* Copyright (C) 2014 Johannes Schauer <j.schauer@email.de>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2, as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#ifndef _MFSHELL_HASH_H_
#define _MFSHELL_HASH_H_
int calc_md5(FILE * file, unsigned char *hash);
int calc_sha256(FILE * file, unsigned char *hash);
#endif