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annotate libtommath/bn_mp_prime_is_divisible.c @ 1676:d5cdc60db08e

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ext-info handling for server-sig-algs only client side is handled
author Matt Johnston <matt@ucc.asn.au>
date Tue, 19 May 2020 00:31:41 +0800
parents f52919ffd3b1
children
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f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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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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Steffen Jaeckel <s_jaeckel@gmx.de>
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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 */