#include "tommath_private.h"

#ifdef BN_MP_MOD_C

/* LibTomMath, multiple-precision integer library -- Tom St Denis */

/* SPDX-License-Identifier: Unlicense */

/* c = a mod b, 0 <= c < b if b > 0, b < c <= 0 if b < 0 */

mp_err mp_mod(const mp_int *a, const mp_int *b, mp_int *c)

{

   mp_int  t;

   mp_err  err;

   if ((err = mp_init_size(&t, b->used)) != MP_OKAY) {

      return err;

   }

   if ((err = mp_div(a, b, NULL, &t)) != MP_OKAY) {

      goto LBL_ERR;

   }

   if (MP_IS_ZERO(&t) || (t.sign == b->sign)) {

      err = MP_OKAY;

      mp_exch(&t, c);

   } else {

      err = mp_add(b, &t, c);

   }

LBL_ERR:

   mp_clear(&t);

   return err;

}

#endif