Mercurial > dropbear
view libtommath/bn_mp_reduce_2k_setup.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> |
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date | Thu, 28 May 2020 22:50:41 +0800 |
parents | 1051e4eea25a |
children |
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#include "tommath_private.h" #ifdef BN_MP_REDUCE_2K_SETUP_C /* LibTomMath, multiple-precision integer library -- Tom St Denis */ /* SPDX-License-Identifier: Unlicense */ /* determines the setup value */ mp_err mp_reduce_2k_setup(const mp_int *a, mp_digit *d) { mp_err err; mp_int tmp; int p; if ((err = mp_init(&tmp)) != MP_OKAY) { return err; } p = mp_count_bits(a); if ((err = mp_2expt(&tmp, p)) != MP_OKAY) { mp_clear(&tmp); return err; } if ((err = s_mp_sub(&tmp, a, &tmp)) != MP_OKAY) { mp_clear(&tmp); return err; } *d = tmp.dp[0]; mp_clear(&tmp); return MP_OKAY; } #endif