| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * Key consistency checking tools for large integers |
| 4 | * |
| 5 | * (c) 2001 Straylight/Edgeware |
| 6 | */ |
| 7 | |
| 8 | /*----- Licensing notice --------------------------------------------------* |
| 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. |
| 16 | * |
| 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. |
| 21 | * |
| 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 | |
| 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 | |
| 56 | int 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 -------------------------------------------------*/ |