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comparison bn_mp_dr_setup.c @ 2:86e0b50a9b58 libtommath-orig ltm-0.30-orig

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ltm 0.30 orig import
author Matt Johnston <matt@ucc.asn.au>
date Mon, 31 May 2004 18:25:22 +0000
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-1:000000000000 2:86e0b50a9b58
1 /* LibTomMath, multiple-precision integer library -- Tom St Denis
2 *
3 * LibTomMath is a library that provides multiple-precision
4 * integer arithmetic as well as number theoretic functionality.
5 *
6 * The library was designed directly after the MPI library by
7 * Michael Fromberger but has been written from scratch with
8 * additional optimizations in place.
9 *
10 * The library is free for all purposes without any express
11 * guarantee it works.
12 *
13 * Tom St Denis, [email protected], http://math.libtomcrypt.org
14 */
15 #include <tommath.h>
16
17 /* determines the setup value */
18 void mp_dr_setup(mp_int *a, mp_digit *d)
19 {
20 /* the casts are required if DIGIT_BIT is one less than
21 * the number of bits in a mp_digit [e.g. DIGIT_BIT==31]
22 */
23 *d = (mp_digit)((((mp_word)1) << ((mp_word)DIGIT_BIT)) -
24 ((mp_word)a->dp[0]));
25 }
26