Mercurial > dropbear

annotate libtommath/bn_mp_prime_rabin_miller_trials.c @ 1674:ba6fc7afe1c5

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author Matt Johnston <matt@ucc.asn.au>
date Mon, 06 Apr 2020 23:18:26 +0800
parents a36e545fb43d
children 1051e4eea25a
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1 #include "tommath_private.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 * SPDX-License-Identifier: Unlicense
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13 */
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14
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16 static const struct {
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17 int k, t;
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18 } sizes[] = {
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19 { 80, -1 }, /* Use deterministic algorithm for size <= 80 bits */
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20 { 81, 39 },
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21 { 96, 37 },
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22 { 128, 32 },
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23 { 160, 27 },
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24 { 192, 21 },
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25 { 256, 16 },
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26 { 384, 10 },
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27 { 512, 7 },
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28 { 640, 6 },
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29 { 768, 5 },
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30 { 896, 4 },
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31 { 1024, 4 },
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32 { 2048, 2 } /* For bigger keysizes use always at least 2 Rounds */
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33 };
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34
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35 /* returns # of RM trials required for a given bit size and max. error of 2^(-96)*/
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36 int mp_prime_rabin_miller_trials(int size)
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37 {
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38 int x;
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39
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40 for (x = 0; x < (int)(sizeof(sizes)/(sizeof(sizes[0]))); x++) {
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41 if (sizes[x].k == size) {
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42 return sizes[x].t;
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43 } else if (sizes[x].k > size) {
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44 return (x == 0) ? sizes[0].t : sizes[x - 1].t;
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45 }
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46 }
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47 return sizes[x-1].t;
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48 }
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51 #endif
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52
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53 /* ref: HEAD -> master, tag: v1.1.0 */
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54 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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55 /* commit time: 2019-01-28 20:32:32 +0100 */