Mercurial > dropbear
view libtommath/bn_mp_clamp.c @ 1702:8f93f37c01de
Allow DH to be completely disabled (#97)
Reduces binary size by ~2kB by default and by 21kB with no other
libtommath functions users, ex. with curve25519 kex and ed25519
key only.
author | Vladislav Grishenko <themiron@users.noreply.github.com> |
---|---|
date | Thu, 28 May 2020 20:01:48 +0500 |
parents | 1051e4eea25a |
children |
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#include "tommath_private.h" #ifdef BN_MP_CLAMP_C /* LibTomMath, multiple-precision integer library -- Tom St Denis */ /* SPDX-License-Identifier: Unlicense */ /* trim unused digits * * This is used to ensure that leading zero digits are * trimed and the leading "used" digit will be non-zero * Typically very fast. Also fixes the sign if there * are no more leading digits */ void mp_clamp(mp_int *a) { /* decrease used while the most significant digit is * zero. */ while ((a->used > 0) && (a->dp[a->used - 1] == 0u)) { --(a->used); } /* reset the sign flag if used == 0 */ if (a->used == 0) { a->sign = MP_ZPOS; } } #endif