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/* gchash.c - Calculate hash values
* Copyright (C) 2013 Dmitry Eremin-Solenikov
*
* This file is part of Libgcrypt.
*
* Libgcrypt is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* Libgcrypt 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#ifdef _GCRYPT_IN_LIBGCRYPT
# undef _GCRYPT_IN_LIBGCRYPT
# include "gcrypt.h"
#else
# include <gcrypt.h>
#endif
void
init_gcrypt (void)
{
if (!gcry_check_version (GCRYPT_VERSION)) {
fputs ("libgcrypt version mismatch\n", stderr);
exit (2);
}
gcry_control (GCRYCTL_SUSPEND_SECMEM_WARN);
/* Allocate a pool of 16k secure memory. This make the secure memory
* available and also drops privileges where needed. */
gcry_control (GCRYCTL_INIT_SECMEM, 16384, 0);
gcry_control (GCRYCTL_RESUME_SECMEM_WARN);
gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
}
int
main (int argc, char **argv)
{
gcry_md_hd_t hd;
gcry_error_t err;
int algo;
init_gcrypt();
if (argc < 2 || (argv[1] && !strcmp(argv[1], "--help")))
{
fprintf (stderr, "Usage: %s <digest> <file>...\n", argv[0]);
return 1;
}
algo = gcry_md_map_name (argv[1]);
if (algo == GCRY_MD_NONE)
{
fprintf (stderr, "Unknown algorithm '%s'\n", argv[1]);
return 1;
}
err = gcry_md_open(&hd, algo, 0);
if (err)
{
fprintf (stderr, "LibGCrypt error %s/%s\n",
gcry_strsource (err),
gcry_strerror (err));
exit (1);
}
for (argv += 2; *argv; argv++)
{
FILE *fp;
unsigned char buf[1024];
size_t size;
int i;
unsigned char *h;
if (!strcmp (*argv, "-"))
fp = stdin;
else
fp = fopen (*argv, "r");
if (fp == NULL)
{
perror ("fopen");
return 1;
}
while (!feof (fp))
{
size = fread (buf, 1, sizeof(buf), fp);
gcry_md_write (hd, buf, size);
}
h = gcry_md_read(hd, 0);
for (i = 0; i < gcry_md_get_algo_dlen (algo); i++)
printf("%02hhx", h[i]);
printf(" %s\n", *argv);
gcry_md_reset(hd);
}
gcry_md_close(hd);
return 0;
}
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