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53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
#include <tommath.h>
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#ifdef BN_MP_PRIME_RABIN_MILLER_TRIALS_C
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/* LibTomMath, multiple-precision integer library -- Tom St Denis
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*
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* LibTomMath is a library that provides multiple-precision
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* integer arithmetic as well as number theoretic functionality.
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*
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* The library was designed directly after the MPI library by
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* Michael Fromberger but has been written from scratch with
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* additional optimizations in place.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*
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* Tom St Denis, tomstdenis@gmail.com, http://math.libtomcrypt.com
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*/
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static const struct {
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int k, t;
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} sizes[] = {
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{ 128, 28 },
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{ 256, 16 },
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{ 384, 10 },
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{ 512, 7 },
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{ 640, 6 },
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{ 768, 5 },
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{ 896, 4 },
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{ 1024, 4 }
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};
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/* returns # of RM trials required for a given bit size */
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int mp_prime_rabin_miller_trials(int size)
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{
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int x;
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for (x = 0; x < (int)(sizeof(sizes)/(sizeof(sizes[0]))); x++) {
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if (sizes[x].k == size) {
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return sizes[x].t;
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} else if (sizes[x].k > size) {
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return (x == 0) ? sizes[0].t : sizes[x - 1].t;
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}
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}
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return sizes[x-1].t + 1;
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}
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#endif
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/* $Source: /cvs/libtom/libtommath/bn_mp_prime_rabin_miller_trials.c,v $ */
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/* $Revision: 1.3 $ */
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/* $Date: 2006/03/31 14:18:44 $ */
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