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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: keycheck-mp.c,v 1.2 2004/04/08 01:36:15 mdw Exp $ |
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4 | * |
5 | * Key consistency checking tools for large integers |
6 | * |
7 | * (c) 2001 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Catacomb. |
13 | * |
14 | * Catacomb is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU Library General Public License as |
16 | * published by the Free Software Foundation; either version 2 of the |
17 | * License, or (at your option) any later version. |
18 | * |
19 | * Catacomb is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU Library General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with Catacomb; if not, write to the Free |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
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30 | /*----- Header files ------------------------------------------------------*/ |
31 | |
32 | #include <mLib/dstr.h> |
33 | |
34 | #include "fibrand.h" |
35 | #include "grand.h" |
36 | #include "keycheck.h" |
37 | #include "mp.h" |
38 | #include "mprand.h" |
39 | #include "pfilt.h" |
40 | #include "pgen.h" |
41 | #include "rabin.h" |
42 | #include "rand.h" |
43 | |
44 | /*----- Main code ---------------------------------------------------------*/ |
45 | |
46 | /* --- @keycheck_prime@ --- * |
47 | * |
48 | * Arguments: @keycheck *kc@ = keycheck state |
49 | * @unsigned sev@ = severity if not prime |
50 | * @mp *m@ = a number to check for primality |
51 | * @const char *name@ = name of this number |
52 | * |
53 | * Returns: Zero if OK, or return status from function. |
54 | * |
55 | * Use: Checks that a number is prime. |
56 | */ |
57 | |
58 | int keycheck_prime(keycheck *kc, unsigned sev, mp *m, const char *name) |
59 | { |
60 | int rc; |
61 | |
62 | rc = pfilt_smallfactor(m); |
63 | if (rc == PGEN_TRY) { |
64 | rabin rn; |
65 | grand *r = fibrand_create(0); |
66 | unsigned n; |
67 | mp *x = MP_NEW; |
68 | |
69 | r->ops->misc(r, GRAND_SEEDRAND, &rand_global); |
70 | n = rabin_iters(mp_bits(m)); |
71 | rabin_create(&rn, m); |
72 | do { |
73 | x = mprand_range(x, m, r, 0); |
74 | rc = rabin_test(&rn, x); |
75 | n--; |
76 | } while (n && rc == PGEN_PASS); |
77 | rabin_destroy(&rn); |
78 | mp_drop(x); |
79 | r->ops->destroy(r); |
80 | } |
81 | if (rc != PGEN_FAIL) |
82 | rc = 0; |
83 | else |
84 | rc = keycheck_report(kc, sev, "%s not prime", name); |
85 | return (rc); |
86 | } |
87 | |
88 | /*----- That's all, folks -------------------------------------------------*/ |