| 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 | /** @file lib/authhash.c @brief The authorization hash */ |
| 21 | |
| 22 | #include <config.h> |
| 23 | #include "types.h" |
| 24 | |
| 25 | #include <stddef.h> |
| 26 | #include <gcrypt.h> |
| 27 | #include <assert.h> |
| 28 | |
| 29 | #include "hex.h" |
| 30 | #include "log.h" |
| 31 | #include "authhash.h" |
| 32 | |
| 33 | #ifndef AUTHHASH |
| 34 | /** @brief Which hash function to use */ |
| 35 | # define AUTHHASH GCRY_MD_SHA1 |
| 36 | #endif |
| 37 | |
| 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 | */ |
| 47 | const char *authhash(const void *challenge, size_t nchallenge, |
| 48 | const char *password) { |
| 49 | gcrypt_hash_handle h; |
| 50 | const char *res; |
| 51 | |
| 52 | assert(challenge != 0); |
| 53 | assert(password != 0); |
| 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 | */ |