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view libtommath/bn_mp_signed_rsh.c @ 1923:ffa0f666fde2
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Patch modified by Matt Johnston
Signed-off-by: Begley Brothers Inc <[email protected]>
author | Begley Brothers Inc <begleybrothers@gmail.com> |
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date | Thu, 09 Jul 2020 22:06:26 +1000 |
parents | 1051e4eea25a |
children |
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#include "tommath_private.h" #ifdef BN_MP_SIGNED_RSH_C /* LibTomMath, multiple-precision integer library -- Tom St Denis */ /* SPDX-License-Identifier: Unlicense */ /* shift right by a certain bit count with sign extension */ mp_err mp_signed_rsh(const mp_int *a, int b, mp_int *c) { mp_err res; if (a->sign == MP_ZPOS) { return mp_div_2d(a, b, c, NULL); } res = mp_add_d(a, 1uL, c); if (res != MP_OKAY) { return res; } res = mp_div_2d(c, b, c, NULL); return (res == MP_OKAY) ? mp_sub_d(c, 1uL, c) : res; } #endif