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comparison 3rdparty/libtommath/bn_mp_reduce_setup.c @ 0:2cf249471370
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| author | Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp> |
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| date | Tue, 08 May 2018 16:09:12 +0900 |
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| -1:000000000000 | 0:2cf249471370 |
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| 1 #include <tommath_private.h> | |
| 2 #ifdef BN_MP_REDUCE_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, tstdenis82@gmail.com, http://libtom.org | |
| 16 */ | |
| 17 | |
| 18 /* pre-calculate the value required for Barrett reduction | |
| 19 * For a given modulus "b" it calulates the value required in "a" | |
| 20 */ | |
| 21 int mp_reduce_setup (mp_int * a, mp_int * b) | |
| 22 { | |
| 23 int res; | |
| 24 | |
| 25 if ((res = mp_2expt (a, b->used * 2 * DIGIT_BIT)) != MP_OKAY) { | |
| 26 return res; | |
| 27 } | |
| 28 return mp_div (a, b, a, NULL); | |
| 29 } | |
| 30 #endif | |
| 31 | |
| 32 /* $Source$ */ | |
| 33 /* $Revision$ */ | |
| 34 /* $Date$ */ |