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view 3rdparty/libtommath/bn_mp_prime_rabin_miller_trials.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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#include <tommath_private.h> #ifdef BN_MP_PRIME_RABIN_MILLER_TRIALS_C /* LibTomMath, multiple-precision integer library -- Tom St Denis * * LibTomMath is a library that provides multiple-precision * integer arithmetic as well as number theoretic functionality. * * The library was designed directly after the MPI library by * Michael Fromberger but has been written from scratch with * additional optimizations in place. * * The library is free for all purposes without any express * guarantee it works. * * Tom St Denis, tstdenis82@gmail.com, http://libtom.org */ static const struct { int k, t; } sizes[] = { { 128, 28 }, { 256, 16 }, { 384, 10 }, { 512, 7 }, { 640, 6 }, { 768, 5 }, { 896, 4 }, { 1024, 4 } }; /* returns # of RM trials required for a given bit size */ int mp_prime_rabin_miller_trials(int size) { int x; for (x = 0; x < (int)(sizeof(sizes)/(sizeof(sizes[0]))); x++) { if (sizes[x].k == size) { return sizes[x].t; } else if (sizes[x].k > size) { return (x == 0) ? sizes[0].t : sizes[x - 1].t; } } return sizes[x-1].t + 1; } #endif /* $Source$ */ /* $Revision$ */ /* $Date$ */