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comparison bignum.c @ 4:fe6bca95afa7

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Makefile.in contains updated files required
author Matt Johnston <matt@ucc.asn.au>
date Tue, 01 Jun 2004 02:46:09 +0000
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children 82fcf3185616
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-1:000000000000 4:fe6bca95afa7
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 /* convert an unsigned mp into an array of bytes, malloced.
56 * This array must be freed after use, len contains the length of the array,
57 * if len != NULL */
58 unsigned char* mptobytes(mp_int *mp, int *len) {
59
60 unsigned char* ret;
61 int size;
62
63 size = mp_unsigned_bin_size(mp);
64 ret = m_malloc(size);
65 if (mp_to_unsigned_bin(mp, ret) != MP_OKAY) {
66 dropbear_exit("mem alloc error");
67 }
68 if (len != NULL) {
69 *len = size;
70 }
71 return ret;
72 }
73
74 void bytestomp(mp_int *mp, unsigned char* bytes, unsigned int len) {
75
76 if (mp_read_unsigned_bin(mp, bytes, len) != MP_OKAY) {
77 dropbear_exit("mem alloc error");
78 }
79 }
80
81 /* hash the ssh representation of the mp_int mp */
82 void sha1_process_mp(hash_state *hs, mp_int *mp) {
83
84 int i;
85 buffer * buf;
86
87 buf = buf_new(512 + 20); /* max buffer is a 4096 bit key,
88 plus header + some leeway*/
89 buf_putmpint(buf, mp);
90 i = buf->pos;
91 buf_setpos(buf, 0);
92 sha1_process(hs, buf_getptr(buf, i), i);
93 buf_free(buf);
94 }