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view libtommath/bn_mp_submod.c @ 1888:a7b66ea18632

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Don't set pubkey_info directly in checkpubkey_line This makes it safe to use from fuzzer-pubkey without leaking the value since the cleanup isn't called
author Matt Johnston <matt@ucc.asn.au>
date Wed, 16 Mar 2022 18:35:23 +0800
parents 1051e4eea25a
children
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#include "tommath_private.h"
#ifdef BN_MP_SUBMOD_C
/* LibTomMath, multiple-precision integer library -- Tom St Denis */
/* SPDX-License-Identifier: Unlicense */

/* d = a - b (mod c) */
mp_err mp_submod(const mp_int *a, const mp_int *b, const mp_int *c, mp_int *d)
{
   mp_err err;
   mp_int t;

   if ((err = mp_init(&t)) != MP_OKAY) {
      return err;
   }

   if ((err = mp_sub(a, b, &t)) != MP_OKAY) {
      goto LBL_ERR;
   }
   err = mp_mod(&t, c, d);

LBL_ERR:
   mp_clear(&t);
   return err;
}
#endif