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comparison libtommath/bn_mp_prime_rabin_miller_trials.c @ 284:eed26cff980b

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propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583) to branch 'au.asn.ucc.matt.dropbear' (head fff0894a0399405a9410ea1c6d118f342cf2aa64)
author Matt Johnston <matt@ucc.asn.au>
date Wed, 08 Mar 2006 13:23:49 +0000
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children 5ff8218bcee9
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283:bd240aa12ba7 284:eed26cff980b
1 #include <tommath.h>
2 #ifdef BN_MP_PRIME_RABIN_MILLER_TRIALS_C
3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
4 *
5 * LibTomMath is a library that provides multiple-precision
6 * integer arithmetic as well as number theoretic functionality.
7 *
8 * The library was designed directly after the MPI library by
9 * Michael Fromberger but has been written from scratch with
10 * additional optimizations in place.
11 *
12 * The library is free for all purposes without any express
13 * guarantee it works.
14 *
15 * Tom St Denis, [email protected], http://math.libtomcrypt.org
16 */
17
18
19 static const struct {
20 int k, t;
21 } sizes[] = {
22 { 128, 28 },
23 { 256, 16 },
24 { 384, 10 },
25 { 512, 7 },
26 { 640, 6 },
27 { 768, 5 },
28 { 896, 4 },
29 { 1024, 4 }
30 };
31
32 /* returns # of RM trials required for a given bit size */
33 int mp_prime_rabin_miller_trials(int size)
34 {
35 int x;
36
37 for (x = 0; x < (int)(sizeof(sizes)/(sizeof(sizes[0]))); x++) {
38 if (sizes[x].k == size) {
39 return sizes[x].t;
40 } else if (sizes[x].k > size) {
41 return (x == 0) ? sizes[0].t : sizes[x - 1].t;
42 }
43 }
44 return sizes[x-1].t + 1;
45 }
46
47
48 #endif