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annotate bignum.c @ 69:59d16db56e9f

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author Matt Johnston <matt@ucc.asn.au>
date Thu, 12 Aug 2004 15:41:36 +0000
parents fe6bca95afa7
children 82fcf3185616
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4
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 /* Contains helper functions for mp_int handling */
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26
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27 #include "includes.h"
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28 #include "dbutil.h"
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29
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30 /* wrapper for mp_init, failing fatally on errors (memory allocation) */
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31 void m_mp_init(mp_int *mp) {
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32
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33 if (mp_init(mp) != MP_OKAY) {
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34 dropbear_exit("mem alloc error");
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35 }
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36 }
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37
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38 /* simplified duplication of bn_mp_multi's mp_init_multi, but die fatally
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39 * on error */
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40 void m_mp_init_multi(mp_int *mp, ...)
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41 {
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42 mp_int* cur_arg = mp;
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43 va_list args;
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44
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45 va_start(args, mp); /* init args to next argument from caller */
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46 while (cur_arg != NULL) {
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47 if (mp_init(cur_arg) != MP_OKAY) {
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48 dropbear_exit("mem alloc error");
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49 }
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50 cur_arg = va_arg(args, mp_int*);
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51 }
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52 va_end(args);
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53 }
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54
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55 /* convert an unsigned mp into an array of bytes, malloced.
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56 * This array must be freed after use, len contains the length of the array,
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57 * if len != NULL */
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58 unsigned char* mptobytes(mp_int *mp, int *len) {
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59
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60 unsigned char* ret;
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61 int size;
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62
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63 size = mp_unsigned_bin_size(mp);
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64 ret = m_malloc(size);
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65 if (mp_to_unsigned_bin(mp, ret) != MP_OKAY) {
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66 dropbear_exit("mem alloc error");
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67 }
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68 if (len != NULL) {
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69 *len = size;
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70 }
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71 return ret;
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72 }
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73
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74 void bytestomp(mp_int *mp, unsigned char* bytes, unsigned int len) {
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75
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76 if (mp_read_unsigned_bin(mp, bytes, len) != MP_OKAY) {
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77 dropbear_exit("mem alloc error");
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78 }
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79 }
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80
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81 /* hash the ssh representation of the mp_int mp */
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82 void sha1_process_mp(hash_state *hs, mp_int *mp) {
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83
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84 int i;
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85 buffer * buf;
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86
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87 buf = buf_new(512 + 20); /* max buffer is a 4096 bit key,
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88 plus header + some leeway*/
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89 buf_putmpint(buf, mp);
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90 i = buf->pos;
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91 buf_setpos(buf, 0);
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92 sha1_process(hs, buf_getptr(buf, i), i);
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93 buf_free(buf);
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94 }