Mercurial > dropbear
view libtommath/bn_mp_count_bits.c @ 1698:f966834f0f9c
Use Linux getrandom() to ensure random device is initialised
Remove old code warning about random device being not ready,
/dev/random isn't used by default anyway.
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Thu, 28 May 2020 22:50:41 +0800 |
parents | 1051e4eea25a |
children |
line wrap: on
line source
#include "tommath_private.h" #ifdef BN_MP_COUNT_BITS_C /* LibTomMath, multiple-precision integer library -- Tom St Denis */ /* SPDX-License-Identifier: Unlicense */ /* returns the number of bits in an int */ int mp_count_bits(const mp_int *a) { int r; mp_digit q; /* shortcut */ if (MP_IS_ZERO(a)) { return 0; } /* get number of digits and add that */ r = (a->used - 1) * MP_DIGIT_BIT; /* take the last digit and count the bits in it */ q = a->dp[a->used - 1]; while (q > 0u) { ++r; q >>= 1u; } return r; } #endif