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#include "tommath_private.h"
#ifdef MP_MULMOD_C
/* LibTomMath, multiple-precision integer library -- Tom St Denis */
/* SPDX-License-Identifier: Unlicense */

/* d = a * b (mod c) */
mp_err mp_mulmod(const mp_int *a, const mp_int *b, const mp_int *c, mp_int *d)
{
   mp_err err;
   if ((err = mp_mul(a, b, d)) != MP_OKAY) {
      return err;
   }
   return mp_mod(d, c, d);
}
#endif

kc3-lang/libtommath/mp_mulmod.c

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mp_mulmod.c