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460b9539 | 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 | */ | |
14ad73b9 | 20 | /** @file lib/authhash.c @brief The authorization hash */ |
460b9539 | 21 | |
22 | #include <config.h> | |
23 | #include "types.h" | |
24 | ||
25 | #include <stddef.h> | |
26 | #include <gcrypt.h> | |
1c0d78bd | 27 | #include <assert.h> |
460b9539 | 28 | |
29 | #include "hex.h" | |
30 | #include "log.h" | |
31 | #include "authhash.h" | |
32 | ||
33 | #ifndef AUTHHASH | |
d7b6f0d1 | 34 | /** @brief Which hash function to use */ |
460b9539 | 35 | # define AUTHHASH GCRY_MD_SHA1 |
36 | #endif | |
37 | ||
d7b6f0d1 | 38 | /** @brief Perform the authorization hash function |
39 | * @param challenge Pointer to challange | |
40 | * @param nchallenge Size of challenge | |
41 | * @param password Password | |
42 | * | |
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. | |
46 | */ | |
460b9539 | 47 | const char *authhash(const void *challenge, size_t nchallenge, |
48 | const char *password) { | |
49 | gcrypt_hash_handle h; | |
50 | const char *res; | |
1c0d78bd RK |
51 | |
52 | assert(challenge != 0); | |
53 | assert(password != 0); | |
460b9539 | 54 | #if HAVE_GCRY_ERROR_T |
55 | { | |
56 | gcry_error_t e; | |
57 | ||
58 | if((e = gcry_md_open(&h, AUTHHASH, 0))) { | |
59 | error(0, "gcry_md_open: %s", gcry_strerror(e)); | |
60 | return 0; | |
61 | } | |
62 | } | |
63 | #else | |
64 | h = gcry_md_open(AUTHHASH, 0); | |
65 | #endif | |
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)); | |
69 | gcry_md_close(h); | |
70 | return res; | |
71 | } | |
72 | ||
73 | /* | |
74 | Local Variables: | |
75 | c-basic-offset:2 | |
76 | comment-column:40 | |
77 | fill-column:79 | |
78 | End: | |
79 | */ |