Mercurial > dropbear
comparison bn_mp_dr_setup.c @ 282:91fbc376f010 libtommath-orig libtommath-0.35
Import of libtommath 0.35
From ltm-0.35.tar.bz2 SHA1 of 3f193dbae9351e92d02530994fa18236f7fde01c
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Wed, 08 Mar 2006 13:16:18 +0000 |
| parents | |
| children | 97db060d0ef5 |
comparison
equal
deleted
inserted
replaced
| -1:000000000000 | 282:91fbc376f010 |
|---|---|
| 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 |