| #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@gmail.com, http://math.libtomcrypt.com |
| */ |
| |
| /* d = a - b (mod c) */ |
| int |
| mp_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 |
| |
| /* $Source: /cvs/libtom/libtommath/bn_mp_submod.c,v $ */ |
| /* $Revision: 1.3 $ */ |
| /* $Date: 2006/03/31 14:18:44 $ */ |
