Mercurial > dropbear

annotate libtommath/bn_s_mp_prime_is_divisible.c @ 1909:43ebe0028187

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Add tests for dropbearconvert
author Matt Johnston <matt@ucc.asn.au>
date Tue, 29 Mar 2022 22:29:17 +0800
parents 1051e4eea25a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1692
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1 #include "tommath_private.h"
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2 #ifdef BN_S_MP_PRIME_IS_DIVISIBLE_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
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4 /* SPDX-License-Identifier: Unlicense */
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5
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6 /* determines if an integers is divisible by one
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7 * of the first PRIME_SIZE primes or not
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8 *
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9 * sets result to 0 if not, 1 if yes
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10 */
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11 mp_err s_mp_prime_is_divisible(const mp_int *a, mp_bool *result)
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12 {
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13 int ix;
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14 mp_err err;
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15 mp_digit res;
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16
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17 /* default to not */
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18 *result = MP_NO;
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19
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20 for (ix = 0; ix < PRIVATE_MP_PRIME_TAB_SIZE; ix++) {
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21 /* what is a mod LBL_prime_tab[ix] */
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22 if ((err = mp_mod_d(a, s_mp_prime_tab[ix], &res)) != MP_OKAY) {
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23 return err;
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24 }
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25
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26 /* is the residue zero? */
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27 if (res == 0u) {
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28 *result = MP_YES;
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29 return MP_OKAY;
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30 }
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31 }
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32
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33 return MP_OKAY;
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34 }
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35 #endif