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comparison libtommath/bn_mp_tc_div_2d.c @ 1655:f52919ffd3b1

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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>
date Mon, 16 Sep 2019 15:50:38 +0200
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1654:cc0fc5131c5c 1655:f52919ffd3b1
1 #include "tommath_private.h"
2 #ifdef BN_MP_TC_DIV_2D_C
3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
4 *
5 * LibTomMath is a library that provides multiple-precision
6 * integer arithmetic as well as number theoretic functionality.
7 *
8 * The library was designed directly after the MPI library by
9 * Michael Fromberger but has been written from scratch with
10 * additional optimizations in place.
11 *
12 * SPDX-License-Identifier: Unlicense
13 */
14
15 /* two complement right shift */
16 int mp_tc_div_2d(const mp_int *a, int b, mp_int *c)
17 {
18 int res;
19 if (mp_isneg(a) == MP_NO) {
20 return mp_div_2d(a, b, c, NULL);
21 }
22
23 res = mp_add_d(a, 1uL, c);
24 if (res != MP_OKAY) {
25 return res;
26 }
27
28 res = mp_div_2d(c, b, c, NULL);
29 return (res == MP_OKAY) ? mp_sub_d(c, 1uL, c) : res;
30 }
31 #endif
32
33 /* ref: HEAD -> master, tag: v1.1.0 */
34 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
35 /* commit time: 2019-01-28 20:32:32 +0100 */