1 /* $NetBSD: bn_mp_dr_setup.c,v 1.1.1.1 2011/04/13 18:14:54 elric Exp $ */ 2 3 #include <tommath.h> 4 #ifdef BN_MP_DR_SETUP_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 /* determines the setup value */ 21 void mp_dr_setup(mp_int *a, mp_digit *d) 22 { 23 /* the casts are required if DIGIT_BIT is one less than 24 * the number of bits in a mp_digit [e.g. DIGIT_BIT==31] 25 */ 26 *d = (mp_digit)((((mp_word)1) << ((mp_word)DIGIT_BIT)) - 27 ((mp_word)a->dp[0])); 28 } 29 30 #endif 31 32 /* Source: /cvs/libtom/libtommath/bn_mp_dr_setup.c,v */ 33 /* Revision: 1.4 */ 34 /* Date: 2006/12/28 01:25:13 */ 35