Mercurial > dropbear

annotate libtommath/bn_mp_cmp_mag.c @ 1663:c795520269f9

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Fallback for key gen without hard link support (#89) Add a non-atomic fallback for key generation on platforms where link() is not permitted (such as most stock Android installs) or on filesystems without hard link support (such as FAT).
author Matt Robinson <git@nerdoftheherd.com>
date Sat, 14 Mar 2020 14:37:35 +0000
parents f52919ffd3b1
children 1051e4eea25a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_CMP_MAG_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
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4 *
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5 * LibTomMath is a library that provides multiple-precision
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6 * integer arithmetic as well as number theoretic functionality.
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7 *
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8 * The library was designed directly after the MPI library by
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9 * Michael Fromberger but has been written from scratch with
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10 * additional optimizations in place.
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11 *
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12 * SPDX-License-Identifier: Unlicense
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13 */
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14
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15 /* compare maginitude of two ints (unsigned) */
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16 int mp_cmp_mag(const mp_int *a, const mp_int *b)
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17 {
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18 int n;
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19 mp_digit *tmpa, *tmpb;
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20
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21 /* compare based on # of non-zero digits */
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22 if (a->used > b->used) {
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23 return MP_GT;
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24 }
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25
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26 if (a->used < b->used) {
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27 return MP_LT;
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28 }
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30 /* alias for a */
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31 tmpa = a->dp + (a->used - 1);
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33 /* alias for b */
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34 tmpb = b->dp + (a->used - 1);
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35
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36 /* compare based on digits */
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37 for (n = 0; n < a->used; ++n, --tmpa, --tmpb) {
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38 if (*tmpa > *tmpb) {
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39 return MP_GT;
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40 }
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41
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42 if (*tmpa < *tmpb) {
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43 return MP_LT;
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44 }
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45 }
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46 return MP_EQ;
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47 }
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48 #endif
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49
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50 /* ref: HEAD -> master, tag: v1.1.0 */
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51 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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52 /* commit time: 2019-01-28 20:32:32 +0100 */