Mercurial > dropbear
view libtommath/bn_s_mp_get_bit.c @ 1723:5386011b740d
Disable toom and karatsuba for new libtommath
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Thu, 18 Jun 2020 19:12:07 +0800 |
parents | 1051e4eea25a |
children |
line wrap: on
line source
#include "tommath_private.h" #ifdef BN_S_MP_GET_BIT_C /* LibTomMath, multiple-precision integer library -- Tom St Denis */ /* SPDX-License-Identifier: Unlicense */ /* Get bit at position b and return MP_YES if the bit is 1, MP_NO if it is 0 */ mp_bool s_mp_get_bit(const mp_int *a, unsigned int b) { mp_digit bit; int limb = (int)(b / MP_DIGIT_BIT); if (limb >= a->used) { return MP_NO; } bit = (mp_digit)1 << (b % MP_DIGIT_BIT); return ((a->dp[limb] & bit) != 0u) ? MP_YES : MP_NO; } #endif