Mercurial > dropbear

annotate libtommath/bn_mp_prime_rabin_miller_trials.c @ 1342:8747c2b19152

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merge 2017.75
author Matt Johnston <matt@ucc.asn.au>
date Thu, 18 May 2017 22:59:38 +0800
parents 5ff8218bcee9
children 60fc6476e044
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1 #include <tommath.h>
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2 #ifdef BN_MP_PRIME_RABIN_MILLER_TRIALS_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
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4 *
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5 * LibTomMath is a library that provides multiple-precision
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6 * integer arithmetic as well as number theoretic functionality.
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7 *
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8 * The library was designed directly after the MPI library by
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9 * Michael Fromberger but has been written from scratch with
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10 * additional optimizations in place.
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11 *
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12 * The library is free for all purposes without any express
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13 * guarantee it works.
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14 *
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15 * Tom St Denis, [email protected], http://math.libtomcrypt.com
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16 */
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19 static const struct {
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20 int k, t;
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21 } sizes[] = {
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22 { 128, 28 },
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23 { 256, 16 },
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24 { 384, 10 },
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25 { 512, 7 },
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26 { 640, 6 },
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27 { 768, 5 },
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28 { 896, 4 },
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29 { 1024, 4 }
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30 };
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32 /* returns # of RM trials required for a given bit size */
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33 int mp_prime_rabin_miller_trials(int size)
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34 {
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35 int x;
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37 for (x = 0; x < (int)(sizeof(sizes)/(sizeof(sizes[0]))); x++) {
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38 if (sizes[x].k == size) {
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39 return sizes[x].t;
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40 } else if (sizes[x].k > size) {
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41 return (x == 0) ? sizes[0].t : sizes[x - 1].t;
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42 }
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43 }
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44 return sizes[x-1].t + 1;
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45 }
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48 #endif
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50 /* $Source: /cvs/libtom/libtommath/bn_mp_prime_rabin_miller_trials.c,v $ */
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51 /* $Revision: 1.3 $ */
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52 /* $Date: 2006/03/31 14:18:44 $ */