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comparison libtommath/bn_mp_signed_rsh.c @ 1739:13d834efc376 fuzz

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merge from main
author Matt Johnston <matt@ucc.asn.au>
date Thu, 15 Oct 2020 19:55:15 +0800
parents 1051e4eea25a
children
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1562:768ebf737aa0 1739:13d834efc376
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