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annotate libtommath/bn_mp_invmod.c @ 1667:986126448688

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Update remaining advise to edit options.h You should edit localoptions.h instead.
author Alexander Dahl <ada@thorsis.com>
date Tue, 10 Mar 2020 15:38:38 +0100
parents f52919ffd3b1
children 1051e4eea25a
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_INVMOD_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 /* hac 14.61, pp608 */
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16 int mp_invmod(const mp_int *a, const mp_int *b, mp_int *c)
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17 {
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18 /* b cannot be negative and has to be >1 */
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19 if ((b->sign == MP_NEG) || (mp_cmp_d(b, 1uL) != MP_GT)) {
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20 return MP_VAL;
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21 }
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23 #ifdef BN_FAST_MP_INVMOD_C
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24 /* if the modulus is odd we can use a faster routine instead */
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25 if ((mp_isodd(b) == MP_YES)) {
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26 return fast_mp_invmod(a, b, c);
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27 }
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28 #endif
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30 #ifdef BN_MP_INVMOD_SLOW_C
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31 return mp_invmod_slow(a, b, c);
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32 #else
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33 return MP_VAL;
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34 #endif
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35 }
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36 #endif
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37
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38 /* ref: HEAD -> master, tag: v1.1.0 */
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39 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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40 /* commit time: 2019-01-28 20:32:32 +0100 */