a30942cc |
1 | /* -*-c-*- |
2 | * |
052b36d0 |
3 | * $Id: strongprime.h,v 1.2 2000/02/12 18:21:03 mdw Exp $ |
a30942cc |
4 | * |
5 | * Generate `strong' prime numbers |
6 | * |
7 | * (c) 1999 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 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: strongprime.h,v $ |
052b36d0 |
33 | * Revision 1.2 2000/02/12 18:21:03 mdw |
34 | * Overhaul of key management (again). |
35 | * |
a30942cc |
36 | * Revision 1.1 1999/12/22 15:51:22 mdw |
37 | * Find `strong' RSA primes using Gordon's algorithm. |
38 | * |
39 | */ |
40 | |
41 | #ifndef CATACOMB_STRONGPRIME_H |
42 | #define CATACOMB_STRONGPRIME_H |
43 | |
44 | #ifdef __cplusplus |
45 | extern "C" { |
46 | #endif |
47 | |
48 | /*----- Header files ------------------------------------------------------*/ |
49 | |
50 | #ifndef CATACOMB_GRAND_H |
51 | # include "grand.h" |
52 | #endif |
53 | |
54 | #ifndef CATACOMB_PGEN_H |
55 | # include "pgen.h" |
56 | #endif |
57 | |
58 | /*----- Functions provided ------------------------------------------------*/ |
59 | |
052b36d0 |
60 | /* --- @strongprime_setup@ --- * |
61 | * |
62 | * Arguments: @const char *name@ = pointer to name root |
63 | * @mp *d@ = destination for search start point |
64 | * @pfilt *f@ = where to store filter jump context |
65 | * @unsigned nbits@ = number of bits wanted |
66 | * @grand *r@ = random number source |
67 | * @unsigned n@ = number of attempts to make |
68 | * @pgen_proc *event@ = event handler function |
69 | * @void *ectx@ = argument for the event handler |
70 | * |
71 | * Returns: A starting point for a `strong' prime search, or zero. |
72 | * |
73 | * Use: Sets up for a strong prime search, so that primes with |
74 | * particular properties can be found. It's probably important |
75 | * to note that the number left in the filter context @f@ is |
76 | * congruent to 2 (mod 4). |
77 | */ |
78 | |
79 | extern mp *strongprime_setup(const char */*name*/, mp */*d*/, pfilt */*f*/, |
80 | unsigned /*nbits*/, grand */*r*/, |
81 | unsigned /*n*/, pgen_proc */*event*/, |
82 | void */*ectx*/); |
83 | |
a30942cc |
84 | /* --- @strongprime@ --- * |
85 | * |
86 | * Arguments: @const char *name@ = pointer to name root |
87 | * @mp *d@ = destination integer |
88 | * @unsigned nbits@ = number of bits wanted |
89 | * @grand *r@ = random number source |
90 | * @unsigned n@ = number of attempts to make |
91 | * @pgen_proc *event@ = event handler function |
92 | * @void *ectx@ = argument for the event handler |
93 | * |
94 | * Returns: A `strong' prime, or zero. |
95 | * |
96 | * Use: Finds `strong' primes. A strong prime %$p$% is such that |
97 | * |
98 | * * %$p - 1$% has a large prime factor %$r$%, |
99 | * * %$p + 1$% has a large prime factor %$s$%, and |
100 | * * %$r - 1$% has a large prime factor %$t$%. |
101 | * |
102 | * The numbers produced may be slightly larger than requested, |
103 | * by a few bits. |
104 | */ |
105 | |
106 | extern mp *strongprime(const char */*name*/, mp */*d*/, unsigned /*nbits*/, |
107 | grand */*r*/, unsigned /*n*/, |
108 | pgen_proc */*event*/, void */*ectx*/); |
109 | |
110 | /*----- That's all, folks -------------------------------------------------*/ |
111 | |
112 | #ifdef __cplusplus |
113 | } |
114 | #endif |
115 | |
116 | #endif |