Mercurial > dropbear

annotate libtommath/bn_mp_prime_is_divisible.c @ 1665:7c17995bcdfb

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Improve address logging on early exit messages (#83) Change 'Early exit' and 'Exit before auth' messages to include the IP address & port as part of the message. This allows log scanning utilities such as 'fail2ban' to obtain the offending IP address as part of the failure event instead of extracting the PID from the message and then scanning the log again for match 'child connection from' messages Signed-off-by: Kevin Darbyshire-Bryant <[email protected]>
author Kevin Darbyshire-Bryant <6500011+ldir-EDB0@users.noreply.github.com>
date Wed, 18 Mar 2020 15:28:56 +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 */