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view libtommath/bn_s_mp_get_bit.c @ 1832:a974a80f5f44
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author | Matt Johnston <matt@codeconstruct.com.au> |
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date | Tue, 12 Oct 2021 21:29:42 +0800 |
parents | 1051e4eea25a |
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#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