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 */
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)
10 if (a->sign == MP_ZPOS) {
11 return mp_div_2d(a, b, c, NULL);
14 res = mp_add_d(a, 1uL, c);
19 res = mp_div_2d(c, b, c, NULL);
20 return (res == MP_OKAY) ? mp_sub_d(c, 1uL, c) : res;