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annotate libtommath/bn_mp_invmod.c @ 1663:c795520269f9

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Fallback for key gen without hard link support (#89) Add a non-atomic fallback for key generation on platforms where link() is not permitted (such as most stock Android installs) or on filesystems without hard link support (such as FAT).
author Matt Robinson <git@nerdoftheherd.com>
date Sat, 14 Mar 2020 14:37:35 +0000
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 */