Line data    Source code

       1             : #include <tommath.h>
       2             : #ifdef BN_MP_SUBMOD_C
       3             : /* LibTomMath, multiple-precision integer library -- Tom St Denis
       4             :  *
       5             :  * LibTomMath is a library that provides multiple-precision
       6             :  * integer arithmetic as well as number theoretic functionality.
       7             :  *
       8             :  * The library was designed directly after the MPI library by
       9             :  * Michael Fromberger but has been written from scratch with
      10             :  * additional optimizations in place.
      11             :  *
      12             :  * The library is free for all purposes without any express
      13             :  * guarantee it works.
      14             :  *
      15             :  * Tom St Denis, tomstdenis@gmail.com, http://libtom.org
      16             :  */
      17             : 
      18             : /* d = a - b (mod c) */
      19             : int
      20           0 : mp_submod (mp_int * a, mp_int * b, mp_int * c, mp_int * d)
      21             : {
      22             :   int     res;
      23             :   mp_int  t;
      24             : 
      25             : 
      26           0 :   if ((res = mp_init (&t)) != MP_OKAY) {
      27           0 :     return res;
      28             :   }
      29             : 
      30           0 :   if ((res = mp_sub (a, b, &t)) != MP_OKAY) {
      31           0 :     mp_clear (&t);
      32           0 :     return res;
      33             :   }
      34           0 :   res = mp_mod (&t, c, d);
      35           0 :   mp_clear (&t);
      36           0 :   return res;
      37             : }
      38             : #endif
      39             : 
      40             : /* $Source: /cvs/libtom/libtommath/bn_mp_submod.c,v $ */
      41             : /* $Revision: 1.4 $ */
      42             : /* $Date: 2006/12/28 01:25:13 $ */