/src/dropbear/src/bignum.c
Line | Count | Source |
1 | | /* |
2 | | * Dropbear - a SSH2 server |
3 | | * |
4 | | * Copyright (c) 2002,2003 Matt Johnston |
5 | | * All rights reserved. |
6 | | * |
7 | | * Permission is hereby granted, free of charge, to any person obtaining a copy |
8 | | * of this software and associated documentation files (the "Software"), to deal |
9 | | * in the Software without restriction, including without limitation the rights |
10 | | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
11 | | * copies of the Software, and to permit persons to whom the Software is |
12 | | * furnished to do so, subject to the following conditions: |
13 | | * |
14 | | * The above copyright notice and this permission notice shall be included in |
15 | | * all copies or substantial portions of the Software. |
16 | | * |
17 | | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
18 | | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
19 | | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
20 | | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
21 | | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
22 | | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
23 | | * SOFTWARE. */ |
24 | | |
25 | | /* Contains helper functions for mp_int handling */ |
26 | | |
27 | | #include "includes.h" |
28 | | #include "dbutil.h" |
29 | | |
30 | | /* wrapper for mp_init, failing fatally on errors (memory allocation) */ |
31 | 0 | void m_mp_init(mp_int *mp) { |
32 | |
|
33 | 0 | if (mp_init(mp) != MP_OKAY) { |
34 | 0 | dropbear_exit("Mem alloc error"); |
35 | 0 | } |
36 | 0 | } |
37 | | |
38 | | /* simplified duplication of bn_mp_multi's mp_init_multi, but die fatally |
39 | | * on error */ |
40 | | void m_mp_init_multi(mp_int *mp, ...) |
41 | 0 | { |
42 | 0 | mp_int* cur_arg = mp; |
43 | 0 | va_list args; |
44 | |
|
45 | 0 | va_start(args, mp); /* init args to next argument from caller */ |
46 | 0 | while (cur_arg != NULL) { |
47 | 0 | if (mp_init(cur_arg) != MP_OKAY) { |
48 | 0 | dropbear_exit("Mem alloc error"); |
49 | 0 | } |
50 | 0 | cur_arg = va_arg(args, mp_int*); |
51 | 0 | } |
52 | 0 | va_end(args); |
53 | 0 | } |
54 | | |
55 | | void m_mp_alloc_init_multi(mp_int **mp, ...) |
56 | 0 | { |
57 | 0 | mp_int** cur_arg = mp; |
58 | 0 | va_list args; |
59 | |
|
60 | 0 | va_start(args, mp); /* init args to next argument from caller */ |
61 | 0 | while (cur_arg != NULL) { |
62 | 0 | *cur_arg = m_malloc(sizeof(mp_int)); |
63 | 0 | if (mp_init(*cur_arg) != MP_OKAY) { |
64 | 0 | dropbear_exit("Mem alloc error"); |
65 | 0 | } |
66 | 0 | cur_arg = va_arg(args, mp_int**); |
67 | 0 | } |
68 | 0 | va_end(args); |
69 | 0 | } |
70 | | |
71 | | void m_mp_free_multi(mp_int **mp, ...) |
72 | 0 | { |
73 | 0 | mp_int** cur_arg = mp; |
74 | 0 | va_list args; |
75 | |
|
76 | 0 | va_start(args, mp); /* init args to next argument from caller */ |
77 | 0 | while (cur_arg != NULL) { |
78 | 0 | if (*cur_arg) { |
79 | 0 | mp_clear(*cur_arg); |
80 | 0 | } |
81 | 0 | m_free(*cur_arg); |
82 | 0 | cur_arg = va_arg(args, mp_int**); |
83 | 0 | } |
84 | 0 | va_end(args); |
85 | 0 | } |
86 | | |
87 | 0 | void bytes_to_mp(mp_int *mp, const unsigned char* bytes, unsigned int len) { |
88 | |
|
89 | 0 | if (mp_from_ubin(mp, (unsigned char*)bytes, len) != MP_OKAY) { |
90 | 0 | dropbear_exit("Mem alloc error"); |
91 | 0 | } |
92 | 0 | } |
93 | | |
94 | | /* hash the ssh representation of the mp_int mp */ |
95 | | void hash_process_mp(const struct ltc_hash_descriptor *hash_desc, |
96 | 0 | hash_state *hs, const mp_int *mp) { |
97 | 0 | buffer * buf; |
98 | |
|
99 | 0 | buf = buf_new(512 + 20); /* max buffer is a 4096 bit key, |
100 | | plus header + some leeway*/ |
101 | 0 | buf_putmpint(buf, mp); |
102 | 0 | hash_desc->process(hs, buf->data, buf->len); |
103 | 0 | buf_burn_free(buf); |
104 | 0 | } |