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annotate libtommath/bn_mp_mod.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
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_MOD_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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60fc6476e044 Update to libtommath v1.0
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15 /* c = a mod b, 0 <= c < b if b > 0, b < c <= 0 if b < 0 */
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16 int mp_mod(const mp_int *a, const mp_int *b, mp_int *c)
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17 {
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18 mp_int t;
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19 int res;
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21 if ((res = mp_init_size(&t, b->used)) != MP_OKAY) {
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22 return res;
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23 }
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25 if ((res = mp_div(a, b, NULL, &t)) != MP_OKAY) {
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26 mp_clear(&t);
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27 return res;
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28 }
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30 if ((mp_iszero(&t) != MP_NO) || (t.sign == b->sign)) {
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31 res = MP_OKAY;
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32 mp_exch(&t, c);
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33 } else {
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34 res = mp_add(b, &t, c);
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35 }
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37 mp_clear(&t);
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38 return res;
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39 }
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40 #endif
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42 /* ref: HEAD -> master, tag: v1.1.0 */
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43 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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44 /* commit time: 2019-01-28 20:32:32 +0100 */