Mercurial > dropbear

annotate libtommath/bn_mp_prime_is_divisible.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
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_PRIME_IS_DIVISIBLE_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 /* determines if an integers is divisible by one
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16 * of the first PRIME_SIZE primes or not
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17 *
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18 * sets result to 0 if not, 1 if yes
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19 */
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20 int mp_prime_is_divisible(const mp_int *a, int *result)
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21 {
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22 int err, ix;
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23 mp_digit res;
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25 /* default to not */
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26 *result = MP_NO;
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28 for (ix = 0; ix < PRIME_SIZE; ix++) {
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29 /* what is a mod LBL_prime_tab[ix] */
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30 if ((err = mp_mod_d(a, ltm_prime_tab[ix], &res)) != MP_OKAY) {
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31 return err;
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32 }
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33
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34 /* is the residue zero? */
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35 if (res == 0u) {
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36 *result = MP_YES;
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37 return MP_OKAY;
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38 }
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39 }
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41 return MP_OKAY;
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42 }
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43 #endif
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45 /* ref: HEAD -> master, tag: v1.1.0 */
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46 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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47 /* commit time: 2019-01-28 20:32:32 +0100 */