Mercurial > dropbear
comparison bn_mp_dr_setup.c @ 1:22d5cf7d4b1a libtommath
Renaming branch
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Mon, 31 May 2004 18:23:46 +0000 |
| parents | |
| children | d29b64170cf0 |
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| -1:000000000000 | 1:22d5cf7d4b1a |
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| 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 |