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comparison libtommath/bn_mp_signed_rsh.c @ 1692:1051e4eea25a

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Update LibTomMath to 1.2.0 (#84) * update C files * update other files * update headers * update makefiles * remove mp_set/get_double() * use ltm 1.2.0 API * update ltm_desc * use bundled tommath if system-tommath is too old * XMALLOC etc. were changed to MP_MALLOC etc.
author Steffen Jaeckel <s@jaeckel.eu>
date Tue, 26 May 2020 17:36:47 +0200
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1691:2d3745d58843 1692:1051e4eea25a
1 #include "tommath_private.h"
2 #ifdef BN_MP_SIGNED_RSH_C
3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
4 /* SPDX-License-Identifier: Unlicense */
5
6 /* shift right by a certain bit count with sign extension */
7 mp_err mp_signed_rsh(const mp_int *a, int b, mp_int *c)
8 {
9 mp_err res;
10 if (a->sign == MP_ZPOS) {
11 return mp_div_2d(a, b, c, NULL);
12 }
13
14 res = mp_add_d(a, 1uL, c);
15 if (res != MP_OKAY) {
16 return res;
17 }
18
19 res = mp_div_2d(c, b, c, NULL);
20 return (res == MP_OKAY) ? mp_sub_d(c, 1uL, c) : res;
21 }
22 #endif