2 * This file is part of DisOrder
3 * Copyright (C) 2004, 2006 Richard Kettlewell
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.
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.
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
20 /** @file lib/authhash.c @brief The authorization hash */
34 /** @brief Which hash function to use */
35 # define AUTHHASH GCRY_MD_SHA1
38 /** @brief Perform the authorization hash function
39 * @param challenge Pointer to challange
40 * @param nchallenge Size of challenge
41 * @param password Password
43 * Computes H(challenge|password) and returns it as a newly allocated hex
44 * string. Currently the hash function is SHA-1, but this may be changed in
45 * future versions; see @ref AUTHHASH.
47 const char *authhash(const void *challenge, size_t nchallenge,
48 const char *password) {
52 assert(challenge != 0);
53 assert(password != 0);
58 if((e = gcry_md_open(&h, AUTHHASH, 0))) {
59 error(0, "gcry_md_open: %s", gcry_strerror(e));
64 h = gcry_md_open(AUTHHASH, 0);
66 gcry_md_write(h, password, strlen(password));
67 gcry_md_write(h, challenge, nchallenge);
68 res = hex(gcry_md_read(h, AUTHHASH), gcry_md_get_algo_dlen(AUTHHASH));