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annotate libtommath/bn_mp_mod.c @ 1673:e0871128e61f

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CBC mode cleanup (#95) * Fix CBC mode can't be fully disabled * Fix CBC mode can't be the only mode
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 25 May 2020 20:55:13 +0500
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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20
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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 */