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comparison libtommath/bn_mp_dr_setup.c @ 330:5488db2e9e4e

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merge of 332f709a4cb39cde4cedab7c3be89e05f3023067 and ca4ca78b82c5d430c69ce01bf794e8886ce81431
author Matt Johnston <matt@ucc.asn.au>
date Sat, 10 Jun 2006 16:39:40 +0000
parents eed26cff980b
children 5ff8218bcee9
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329:8ed0dce45126 330:5488db2e9e4e
1 #include <tommath.h>
2 #ifdef BN_MP_DR_SETUP_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, [email protected], http://math.libtomcrypt.org
16 */
17
18 /* determines the setup value */
19 void mp_dr_setup(mp_int *a, mp_digit *d)
20 {
21 /* the casts are required if DIGIT_BIT is one less than
22 * the number of bits in a mp_digit [e.g. DIGIT_BIT==31]
23 */
24 *d = (mp_digit)((((mp_word)1) << ((mp_word)DIGIT_BIT)) -
25 ((mp_word)a->dp[0]));
26 }
27
28 #endif