Mercurial > dropbear

annotate libtommath/bn_mp_prime_rabin_miller_trials.c @ 1711:e9dba7abd939

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Merge libtomcrypt v1.18.2
author Matt Johnston <matt@ucc.asn.au>
date Wed, 10 Jun 2020 23:16:13 +0800
parents 1051e4eea25a
children
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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 /* SPDX-License-Identifier: Unlicense */
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6 static const struct {
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7 int k, t;
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8 } sizes[] = {
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9 { 80, -1 }, /* Use deterministic algorithm for size <= 80 bits */
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10 { 81, 37 }, /* max. error = 2^(-96)*/
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11 { 96, 32 }, /* max. error = 2^(-96)*/
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12 { 128, 40 }, /* max. error = 2^(-112)*/
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13 { 160, 35 }, /* max. error = 2^(-112)*/
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14 { 256, 27 }, /* max. error = 2^(-128)*/
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15 { 384, 16 }, /* max. error = 2^(-128)*/
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16 { 512, 18 }, /* max. error = 2^(-160)*/
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17 { 768, 11 }, /* max. error = 2^(-160)*/
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18 { 896, 10 }, /* max. error = 2^(-160)*/
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19 { 1024, 12 }, /* max. error = 2^(-192)*/
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20 { 1536, 8 }, /* max. error = 2^(-192)*/
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21 { 2048, 6 }, /* max. error = 2^(-192)*/
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22 { 3072, 4 }, /* max. error = 2^(-192)*/
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23 { 4096, 5 }, /* max. error = 2^(-256)*/
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24 { 5120, 4 }, /* max. error = 2^(-256)*/
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25 { 6144, 4 }, /* max. error = 2^(-256)*/
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26 { 8192, 3 }, /* max. error = 2^(-256)*/
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27 { 9216, 3 }, /* max. error = 2^(-256)*/
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28 { 10240, 2 } /* For bigger keysizes use always at least 2 Rounds */
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29 };
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30
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31 /* returns # of RM trials required for a given bit size */
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32 int mp_prime_rabin_miller_trials(int size)
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33 {
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34 int x;
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35
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36 for (x = 0; x < (int)(sizeof(sizes)/(sizeof(sizes[0]))); x++) {
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37 if (sizes[x].k == size) {
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38 return sizes[x].t;
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39 } else if (sizes[x].k > size) {
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40 return (x == 0) ? sizes[0].t : sizes[x - 1].t;
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41 }
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42 }
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43 return sizes[x-1].t;
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44 }
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47 #endif