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annotate libtommath/bn_mp_prime_is_divisible.c @ 1659:d32bcb5c557d

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Add Ed25519 support (#91) * Add support for Ed25519 as a public key type Ed25519 is a elliptic curve signature scheme that offers better security than ECDSA and DSA and good performance. It may be used for both user and host keys. OpenSSH key import and fuzzer are not supported yet. Initially inspired by Peter Szabo. * Add curve25519 and ed25519 fuzzers * Add import and export of Ed25519 keys
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Wed, 11 Mar 2020 21:09:45 +0500
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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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 */