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Giac_maj/libtommath-0.39/bn_mp_mulmod.c 1010 Bytes
6663b6c9   adorian   projet complet av...
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  #include <tommath.h>
  #ifdef BN_MP_MULMOD_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@gmail.com, http://math.libtomcrypt.com
   */
  
  /* d = a * b (mod c) */
  int mp_mulmod (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_mul (a, b, &t)) != MP_OKAY) {
      mp_clear (&t);
      return res;
    }
    res = mp_mod (&t, c, d);
    mp_clear (&t);
    return res;
  }
  #endif
  
  /* $Source: /cvs/libtom/libtommath/bn_mp_mulmod.c,v $ */
  /* $Revision: 1.4 $ */
  /* $Date: 2006/03/31 14:18:44 $ */