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/* libgcrypt-hash.c
* Copyright (C) 2016, Didier Raboud
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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 <gcrypt.h>
#include <stdio.h>
#include <errno.h>
/* NSIS plugin
*/
#include <windows.h>
#ifdef HAVE_EXDLL_H
#include "exdll.h"
#else
#include <nsis/pluginapi.h>
#endif
BOOL WINAPI DllMain (HANDLE hInst, ULONG ul_reason_for_call, LPVOID lpReserved)
{
return TRUE;
}
void hash_fp(char **outhash, int hash_algo, char *filename[]) {
/* Length of resulting hash - gcry_md_get_algo_dlen
* returns digest lenght for an algo */
int hash_len = gcry_md_get_algo_dlen( hash_algo );
/* output hash - this will be binary data */
unsigned char hash[ hash_len ];
/* output hash - converted to hex representation
* 2 hex digits for every byte + 1 for trailing \0 */
*outhash = NULL;
*outhash = (char *) malloc( sizeof(char) * ((hash_len*2)+1) );
char *p = *outhash;
/* File-reading */
FILE *fp;
char buffer[4096];
size_t n;
gcry_md_hd_t hd;
unsigned char *hash_ptr;
/* Initialize hash */
gcry_md_open (&hd, hash_algo, 0);
fp = fopen (*filename, "rb");
if (!fp)
{
fprintf (stderr, "can't open `%s': %s\n", *filename, strerror (errno));
exit (1);
}
while ( (n = fread (buffer, 1, sizeof buffer, fp)))
gcry_md_write(hd, buffer, n);
if (ferror (fp))
{
fprintf (stderr, "error reading `%s': %s\n", *filename,strerror (errno));
exit (1);
}
gcry_md_final(hd);
fclose (fp);
hash_ptr = gcry_md_read (hd, hash_algo);
if (hash_ptr == NULL)
{
fprintf (stderr, "gcry_md_read failed.");
gcry_md_close (hd);
exit (1);
}
memcpy (hash, hash_ptr, sizeof (hash));
/* Convert each byte to its 2 digit ascii
* hex representation and place in outhash */
int i;
for ( i = 0; i < hash_len; i++, p += 2 ) {
snprintf ( p, 3, "%02x", hash[i] );
}
}
void __declspec (dllexport) hashsum (HWND hwndParent, int string_size, char *variables, stack_t ** stacktop, extra_parameters * extra)
{
EXDLL_INIT ();
// First argument is the hash name (md5, sha1, sha256, etc)
char hashname[8];
char *h = hashname;
popstring (hashname);
char filename[1024];
char *f = filename;
popstring (filename);
char *hashhex;
if (strcmp(hashname, "sha1") == 0) {
hash_fp(&hashhex, GCRY_MD_SHA1, &f);
} else if (strcmp(hashname, "sha256") == 0) {
hash_fp(&hashhex, GCRY_MD_SHA256, &f);
} else if (strcmp(hashname, "sha512") == 0) {
hash_fp(&hashhex, GCRY_MD_SHA512, &f);
} else {
pushstring("false");
}
pushstring(hashhex);
free(hashhex);
}
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