#include <tommath.h>#ifdef BN_MP_SUBMOD_C/* LibTomMath, multiple-precision integer library -- Tom St Denis * * LibTomMath is a library that provides multiple-precision * integer arithmetic as well as number theoretic functionality. * * The library was designed directly after the MPI library by * Michael Fromberger but has been written from scratch with * additional optimizations in place. * * The library is free for all purposes without any express * guarantee it works. * * Tom St Denis, tomstdenis@iahu.ca, http://math.libtomcrypt.org *//* d = a - b (mod c) */intmp_submod (mp_int * a, mp_int * b, mp_int * c, mp_int * d){  int     res;  mp_int  t;  if ((res = mp_init (&t)) != MP_OKAY) {    return res;  }  if ((res = mp_sub (a, b, &t)) != MP_OKAY) {    mp_clear (&t);    return res;  }  res = mp_mod (&t, c, d);  mp_clear (&t);  return res;}#endif