Mercurial > dropbear

comparison libtommath/bn_s_mp_get_bit.c @ 1692:1051e4eea25a

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Update LibTomMath to 1.2.0 (#84) * update C files * update other files * update headers * update makefiles * remove mp_set/get_double() * use ltm 1.2.0 API * update ltm_desc * use bundled tommath if system-tommath is too old * XMALLOC etc. were changed to MP_MALLOC etc.
author Steffen Jaeckel <s@jaeckel.eu>
date Tue, 26 May 2020 17:36:47 +0200
parents
children
comparison
equal deleted inserted replaced
1691:2d3745d58843 1692:1051e4eea25a
1 #include "tommath_private.h"
2 #ifdef BN_S_MP_GET_BIT_C
3
4 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
5 /* SPDX-License-Identifier: Unlicense */
6
7 /* Get bit at position b and return MP_YES if the bit is 1, MP_NO if it is 0 */
8 mp_bool s_mp_get_bit(const mp_int *a, unsigned int b)
9 {
10 mp_digit bit;
11 int limb = (int)(b / MP_DIGIT_BIT);
12
13 if (limb >= a->used) {
14 return MP_NO;
15 }
16
17 bit = (mp_digit)1 << (b % MP_DIGIT_BIT);
18 return ((a->dp[limb] & bit) != 0u) ? MP_YES : MP_NO;
19 }
20
21 #endif