mdw@git.distorted.org.uk Git - disorder/blob - lib/authhash.c

   1 /*
   2  * This file is part of DisOrder
   3  * Copyright (C) 2004, 2006 Richard Kettlewell
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  18  * USA
  19  */
  20
  21 #include <config.h>
  22 #include "types.h"
  23
  24 #include <stddef.h>
  25 #include <gcrypt.h>
  26 #include <assert.h>
  27
  28 #include "hex.h"
  29 #include "log.h"
  30 #include "authhash.h"
  31
  32 #ifndef AUTHHASH
  33 # define AUTHHASH GCRY_MD_SHA1
  34 #endif
  35
  36 const char *authhash(const void *challenge, size_t nchallenge,
  37                      const char *password) {
  38   gcrypt_hash_handle h;
  39   const char *res;
  40
  41   assert(challenge != 0);
  42   assert(password != 0);
  43 #if HAVE_GCRY_ERROR_T
  44   {
  45     gcry_error_t e;
  46
  47     if((e = gcry_md_open(&h, AUTHHASH, 0))) {
  48       error(0, "gcry_md_open: %s", gcry_strerror(e));
  49       return 0;
  50     }
  51   }
  52 #else
  53   h = gcry_md_open(AUTHHASH, 0);
  54 #endif
  55   gcry_md_write(h, password, strlen(password));
  56   gcry_md_write(h, challenge, nchallenge);
  57   res = hex(gcry_md_read(h, AUTHHASH), gcry_md_get_algo_dlen(AUTHHASH));
  58   gcry_md_close(h);
  59   return res;
  60 }
  61
  62 /*
  63 Local Variables:
  64 c-basic-offset:2
  65 comment-column:40
  66 fill-column:79
  67 End:
  68 */