Mercurial > dropbear

comparison bignum.c @ 285:1b9e69c058d2

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propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3) to branch 'au.asn.ucc.matt.dropbear' (head fdf4a7a3b97ae5046139915de7e40399cceb2c01)
author Matt Johnston <matt@ucc.asn.au>
date Wed, 08 Mar 2006 13:23:58 +0000
parents c9483550701b
children a98a2138364a 76097ec1a29a
comparison
equal deleted inserted replaced
281:997e6f7dc01e 285:1b9e69c058d2
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 void m_mp_init(mp_int *mp) {
32
33 if (mp_init(mp) != MP_OKAY) {
34 dropbear_exit("mem alloc error");
35 }
36 }
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 {
42 mp_int* cur_arg = mp;
43 va_list args;
44
45 va_start(args, mp); /* init args to next argument from caller */
46 while (cur_arg != NULL) {
47 if (mp_init(cur_arg) != MP_OKAY) {
48 dropbear_exit("mem alloc error");
49 }
50 cur_arg = va_arg(args, mp_int*);
51 }
52 va_end(args);
53 }
54
55 void bytes_to_mp(mp_int *mp, const unsigned char* bytes, unsigned int len) {
56
57 if (mp_read_unsigned_bin(mp, (unsigned char*)bytes, len) != MP_OKAY) {
58 dropbear_exit("mem alloc error");
59 }
60 }
61
62 /* hash the ssh representation of the mp_int mp */
63 void sha1_process_mp(hash_state *hs, mp_int *mp) {
64
65 int i;
66 buffer * buf;
67
68 buf = buf_new(512 + 20); /* max buffer is a 4096 bit key,
69 plus header + some leeway*/
70 buf_putmpint(buf, mp);
71 i = buf->pos;
72 buf_setpos(buf, 0);
73 sha1_process(hs, buf_getptr(buf, i), i);
74 buf_free(buf);
75 }