chiark / gitweb /
base/dispatch.c: Recognize `CPUFEAT_ARM_NEON' as requesting ARM64 SIMD.
[catacomb] / pub / keycheck-mp.c
CommitLineData
600127f0 1/* -*-c-*-
600127f0 2 *
3 * Key consistency checking tools for large integers
4 *
5 * (c) 2001 Straylight/Edgeware
6 */
7
45c0fd36 8/*----- Licensing notice --------------------------------------------------*
600127f0 9 *
10 * This file is part of Catacomb.
11 *
12 * Catacomb is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU Library General Public License as
14 * published by the Free Software Foundation; either version 2 of the
15 * License, or (at your option) any later version.
45c0fd36 16 *
600127f0 17 * Catacomb is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU Library General Public License for more details.
45c0fd36 21 *
600127f0 22 * You should have received a copy of the GNU Library General Public
23 * License along with Catacomb; if not, write to the Free
24 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
25 * MA 02111-1307, USA.
26 */
27
600127f0 28/*----- Header files ------------------------------------------------------*/
29
30#include <mLib/dstr.h>
31
32#include "fibrand.h"
33#include "grand.h"
34#include "keycheck.h"
35#include "mp.h"
36#include "mprand.h"
37#include "pfilt.h"
38#include "pgen.h"
39#include "rabin.h"
40#include "rand.h"
41
42/*----- Main code ---------------------------------------------------------*/
43
44/* --- @keycheck_prime@ --- *
45 *
46 * Arguments: @keycheck *kc@ = keycheck state
47 * @unsigned sev@ = severity if not prime
48 * @mp *m@ = a number to check for primality
49 * @const char *name@ = name of this number
50 *
51 * Returns: Zero if OK, or return status from function.
52 *
53 * Use: Checks that a number is prime.
54 */
55
56int keycheck_prime(keycheck *kc, unsigned sev, mp *m, const char *name)
57{
58 int rc;
59
60 rc = pfilt_smallfactor(m);
61 if (rc == PGEN_TRY) {
62 rabin rn;
63 grand *r = fibrand_create(0);
64 unsigned n;
65 mp *x = MP_NEW;
66
67 r->ops->misc(r, GRAND_SEEDRAND, &rand_global);
68 n = rabin_iters(mp_bits(m));
69 rabin_create(&rn, m);
70 do {
71 x = mprand_range(x, m, r, 0);
72 rc = rabin_test(&rn, x);
73 n--;
74 } while (n && rc == PGEN_PASS);
75 rabin_destroy(&rn);
76 mp_drop(x);
77 r->ops->destroy(r);
78 }
79 if (rc != PGEN_FAIL)
80 rc = 0;
81 else
82 rc = keycheck_report(kc, sev, "%s not prime", name);
83 return (rc);
84}
85
86/*----- That's all, folks -------------------------------------------------*/