Mercurial > dropbear
comparison libtommath/bn_mp_neg.c @ 1655:f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
* make key-generation compliant to FIPS 186.4
* fix includes in tommath_class.h
* update fuzzcorpus instead of error-out
* fixup fuzzing make-targets
* update Makefile.in
* apply necessary patches to ltm sources
* clean-up not required ltm files
* update to vanilla ltm 1.1.0
this already only contains the required files
* remove set/get double
author | Steffen Jaeckel <s_jaeckel@gmx.de> |
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date | Mon, 16 Sep 2019 15:50:38 +0200 |
parents | 8bba51a55704 |
children | 1051e4eea25a |
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1654:cc0fc5131c5c | 1655:f52919ffd3b1 |
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1 #include <tommath_private.h> | 1 #include "tommath_private.h" |
2 #ifdef BN_MP_NEG_C | 2 #ifdef BN_MP_NEG_C |
3 /* LibTomMath, multiple-precision integer library -- Tom St Denis | 3 /* LibTomMath, multiple-precision integer library -- Tom St Denis |
4 * | 4 * |
5 * LibTomMath is a library that provides multiple-precision | 5 * LibTomMath is a library that provides multiple-precision |
6 * integer arithmetic as well as number theoretic functionality. | 6 * integer arithmetic as well as number theoretic functionality. |
7 * | 7 * |
8 * The library was designed directly after the MPI library by | 8 * The library was designed directly after the MPI library by |
9 * Michael Fromberger but has been written from scratch with | 9 * Michael Fromberger but has been written from scratch with |
10 * additional optimizations in place. | 10 * additional optimizations in place. |
11 * | 11 * |
12 * The library is free for all purposes without any express | 12 * SPDX-License-Identifier: Unlicense |
13 * guarantee it works. | |
14 * | |
15 * Tom St Denis, [email protected], http://libtom.org | |
16 */ | 13 */ |
17 | 14 |
18 /* b = -a */ | 15 /* b = -a */ |
19 int mp_neg (mp_int * a, mp_int * b) | 16 int mp_neg(const mp_int *a, mp_int *b) |
20 { | 17 { |
21 int res; | 18 int res; |
22 if (a != b) { | 19 if (a != b) { |
23 if ((res = mp_copy (a, b)) != MP_OKAY) { | 20 if ((res = mp_copy(a, b)) != MP_OKAY) { |
24 return res; | 21 return res; |
25 } | 22 } |
26 } | 23 } |
27 | 24 |
28 if (mp_iszero(b) != MP_YES) { | 25 if (mp_iszero(b) != MP_YES) { |
29 b->sign = (a->sign == MP_ZPOS) ? MP_NEG : MP_ZPOS; | 26 b->sign = (a->sign == MP_ZPOS) ? MP_NEG : MP_ZPOS; |
30 } else { | 27 } else { |
31 b->sign = MP_ZPOS; | 28 b->sign = MP_ZPOS; |
32 } | 29 } |
33 | 30 |
34 return MP_OKAY; | 31 return MP_OKAY; |
35 } | 32 } |
36 #endif | 33 #endif |
37 | 34 |
38 /* ref: $Format:%D$ */ | 35 /* ref: HEAD -> master, tag: v1.1.0 */ |
39 /* git commit: $Format:%H$ */ | 36 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */ |
40 /* commit time: $Format:%ai$ */ | 37 /* commit time: 2019-01-28 20:32:32 +0100 */ |