Mercurial > dropbear

annotate libtommath/bn_mp_mod.c @ 1730:57226fc75cb5

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author Matt Johnston <matt@ucc.asn.au>
date Fri, 26 Jun 2020 20:41:34 +0800
parents 1051e4eea25a
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_MOD_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 /* c = a mod b, 0 <= c < b if b > 0, b < c <= 0 if b < 0 */
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7 mp_err mp_mod(const mp_int *a, const mp_int *b, mp_int *c)
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8 {
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f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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9 mp_int t;
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10 mp_err err;
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11
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12 if ((err = mp_init_size(&t, b->used)) != MP_OKAY) {
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13 return err;
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14 }
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15
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16 if ((err = mp_div(a, b, NULL, &t)) != MP_OKAY) {
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17 goto LBL_ERR;
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18 }
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19
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20 if (MP_IS_ZERO(&t) || (t.sign == b->sign)) {
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21 err = MP_OKAY;
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22 mp_exch(&t, c);
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parents: 1470
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23 } else {
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24 err = mp_add(b, &t, c);
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parents: 1470
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25 }
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26
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27 LBL_ERR:
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28 mp_clear(&t);
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29 return err;
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30 }
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31 #endif