annotate bignum.c @ 640:76097ec1a29a dropbear-tfm

- Bring in original tomsfastmath patch against 0.52 from Peter Turczak in 2008
author Matt Johnston <matt@ucc.asn.au>
date Mon, 21 Nov 2011 19:19:57 +0800
parents c9483550701b
children 2b1bb792cd4d
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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 fp_int handling */
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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 fp_init, failing fatally on errors (memory allocation) */
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31 void m_fp_init(fp_int *fp) {
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33 fp_init(fp);
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34 }
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36 /* simplified duplication of bn_fp_multi's fp_init_multi, but die fatally
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37 * on error */
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38 void m_fp_init_multi(fp_int *fp, ...)
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39 {
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40 fp_int* cur_arg = fp;
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41 va_list args;
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43 va_start(args, fp); /* init args to next argument from caller */
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44 while (cur_arg != NULL) {
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45 fp_init(cur_arg);
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46 cur_arg = va_arg(args, fp_int*);
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47 }
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48 va_end(args);
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49 }
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51 /* simplified duplication of bn_fp_multi's fp_init_multi, but die fatally
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52 * on error */
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53 void m_fp_zero_multi(fp_int *fp, ...)
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54 {
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55 fp_int* cur_arg = fp;
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56 va_list args;
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58 va_start(args, fp); /* init args to next argument from caller */
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59 while (cur_arg != NULL) {
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60 fp_zero(cur_arg);
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61 cur_arg = va_arg(args, fp_int*);
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62 }
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63 va_end(args);
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64 }
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66 void bytes_to_fp(fp_int *fp, const unsigned char* bytes, unsigned int len) {
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68 fp_read_unsigned_bin(fp, (unsigned char*)bytes, len);
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69 }
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71 /* hash the ssh representation of the fp_int fp */
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72 void sha1_process_fp(hash_state *hs, fp_int *fp) {
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74 int i;
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75 buffer * buf;
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76
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77 buf = buf_new(512 + 20); /* max buffer is a 4096 bit key,
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78 plus header + some leeway*/
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79 buf_putfpint(buf, fp);
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80 i = buf->pos;
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81 buf_setpos(buf, 0);
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82 sha1_process(hs, buf_getptr(buf, i), i);
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83 buf_free(buf);
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84 }