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annotate libtommath/bn_mp_neg.c @ 1680:5e763ad6e2e0

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author Matt Johnston <matt@ucc.asn.au>
date Sun, 24 May 2020 13:34:19 +0800
parents f52919ffd3b1
children 1051e4eea25a
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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_NEG_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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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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12 * SPDX-License-Identifier: Unlicense
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13 */
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14
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15 /* b = -a */
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parents: 1470
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16 int mp_neg(const mp_int *a, mp_int *b)
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17 {
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18 int res;
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19 if (a != b) {
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20 if ((res = mp_copy(a, b)) != MP_OKAY) {
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parents: 1470
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21 return res;
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parents: 1470
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22 }
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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23 }
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parents: 1470
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25 if (mp_iszero(b) != MP_YES) {
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parents: 1470
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26 b->sign = (a->sign == MP_ZPOS) ? MP_NEG : MP_ZPOS;
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parents: 1470
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27 } else {
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parents: 1470
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28 b->sign = MP_ZPOS;
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parents: 1470
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29 }
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31 return MP_OKAY;
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32 }
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33 #endif
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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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35 /* ref: HEAD -> master, tag: v1.1.0 */
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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36 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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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37 /* commit time: 2019-01-28 20:32:32 +0100 */