1 /* $NetBSD: bn_mp_submod.c,v 1.1.1.1 2011/04/13 18:14:54 elric Exp $ */ 2 3 #include <tommath.h> 4 #ifdef BN_MP_SUBMOD_C 5 /* LibTomMath, multiple-precision integer library -- Tom St Denis 6 * 7 * LibTomMath is a library that provides multiple-precision 8 * integer arithmetic as well as number theoretic functionality. 9 * 10 * The library was designed directly after the MPI library by 11 * Michael Fromberger but has been written from scratch with 12 * additional optimizations in place. 13 * 14 * The library is free for all purposes without any express 15 * guarantee it works. 16 * 17 * Tom St Denis, tomstdenis@gmail.com, http://libtom.org 18 */ 19 20 /* d = a - b (mod c) */ 21 int 22 mp_submod (mp_int * a, mp_int * b, mp_int * c, mp_int * d) 23 { 24 int res; 25 mp_int t; 26 27 28 if ((res = mp_init (&t)) != MP_OKAY) { 29 return res; 30 } 31 32 if ((res = mp_sub (a, b, &t)) != MP_OKAY) { 33 mp_clear (&t); 34 return res; 35 } 36 res = mp_mod (&t, c, d); 37 mp_clear (&t); 38 return res; 39 } 40 #endif 41 42 /* Source: /cvs/libtom/libtommath/bn_mp_submod.c,v */ 43 /* Revision: 1.4 */ 44 /* Date: 2006/12/28 01:25:13 */ 45