Line data    Source code

       1             : /* gchash.c - Calculate hash values
       2             :  * Copyright (C) 2013 Dmitry Eremin-Solenikov
       3             :  *
       4             :  * This file is part of Libgcrypt.
       5             :  *
       6             :  * Libgcrypt is free software; you can redistribute it and/or modify
       7             :  * it under the terms of the GNU Lesser General Public License as
       8             :  * published by the Free Software Foundation; either version 2.1 of
       9             :  * the License, or (at your option) any later version.
      10             :  *
      11             :  * Libgcrypt is distributed in the hope that it will be useful,
      12             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      14             :  * GNU Lesser General Public License for more details.
      15             :  *
      16             :  * You should have received a copy of the GNU Lesser General Public
      17             :  * License along with this program; if not, see <http://www.gnu.org/licenses/>.
      18             :  */
      19             : 
      20             : #ifdef HAVE_CONFIG_H
      21             : # include <config.h>
      22             : #endif
      23             : #include <stdio.h>
      24             : #include <stdlib.h>
      25             : #include <ctype.h>
      26             : 
      27             : #ifdef _GCRYPT_IN_LIBGCRYPT
      28             : # undef _GCRYPT_IN_LIBGCRYPT
      29             : # include "gcrypt.h"
      30             : #else
      31             : # include <gcrypt.h>
      32             : #endif
      33             : 
      34             : 
      35             : void
      36           0 : init_gcrypt (void)
      37             : {
      38           0 :   if (!gcry_check_version (GCRYPT_VERSION)) {
      39           0 :     fputs ("libgcrypt version mismatch\n", stderr);
      40           0 :     exit (2);
      41             :   }
      42             : 
      43           0 :   gcry_control (GCRYCTL_SUSPEND_SECMEM_WARN);
      44             : 
      45             :   /* Allocate a pool of 16k secure memory.  This make the secure memory
      46             :    * available and also drops privileges where needed.  */
      47           0 :   gcry_control (GCRYCTL_INIT_SECMEM, 16384, 0);
      48             : 
      49           0 :   gcry_control (GCRYCTL_RESUME_SECMEM_WARN);
      50             : 
      51           0 :   gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
      52           0 : }
      53             : 
      54             : int
      55           0 : main (int argc, char **argv)
      56             : {
      57             :   gcry_md_hd_t hd;
      58             :   gcry_error_t err;
      59             :   int algo;
      60             : 
      61           0 :   init_gcrypt();
      62             : 
      63           0 :   if (argc < 2 || (argv[1] && !strcmp(argv[1], "--help")))
      64             :     {
      65           0 :       fprintf (stderr, "Usage: %s <digest> <file>...\n", argv[0]);
      66           0 :       return 1;
      67             :     }
      68             : 
      69           0 :   algo = gcry_md_map_name (argv[1]);
      70           0 :   if (algo == GCRY_MD_NONE)
      71             :     {
      72           0 :       fprintf (stderr, "Unknown algorithm '%s'\n", argv[1]);
      73           0 :       return 1;
      74             :     }
      75             : 
      76           0 :   err = gcry_md_open(&hd, algo, 0);
      77           0 :   if (err)
      78             :     {
      79           0 :       fprintf (stderr, "LibGCrypt error %s/%s\n",
      80             :           gcry_strsource (err),
      81             :           gcry_strerror (err));
      82           0 :       exit (1);
      83             :     }
      84             : 
      85           0 :   for (argv += 2; *argv; argv++)
      86             :     {
      87             :       FILE *fp;
      88             :       unsigned char buf[1024];
      89             :       size_t size;
      90             :       int i;
      91             :       unsigned char *h;
      92           0 :       if (!strcmp (*argv, "-"))
      93           0 :         fp = stdin;
      94             :       else
      95           0 :         fp = fopen (*argv, "r");
      96             : 
      97           0 :       if (fp == NULL)
      98             :         {
      99           0 :           perror ("fopen");
     100           0 :           return 1;
     101             :         }
     102             : 
     103           0 :       while (!feof (fp))
     104             :         {
     105           0 :           size = fread (buf, 1, sizeof(buf), fp);
     106           0 :           gcry_md_write (hd, buf, size);
     107             :         }
     108             : 
     109           0 :       h  = gcry_md_read(hd, 0);
     110             : 
     111           0 :       for (i = 0; i < gcry_md_get_algo_dlen (algo); i++)
     112           0 :         printf("%02x", h[i]);
     113           0 :       printf("  %s\n", *argv);
     114             : 
     115           0 :       gcry_md_reset(hd);
     116             :     }
     117             : 
     118           0 :   gcry_md_close(hd);
     119           0 :   return 0;
     120             : }