44c240ee |
1 | /* -*-c-*- |
2 | * |
052b36d0 |
3 | * $Id: dh.h,v 1.3 2000/02/12 18:21:02 mdw Exp $ |
4 | * |
5 | * Diffie-Hellman and related public-key systems |
44c240ee |
6 | * |
44c240ee |
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: dh.h,v $ |
052b36d0 |
33 | * Revision 1.3 2000/02/12 18:21:02 mdw |
34 | * Overhaul of key management (again). |
44c240ee |
35 | * |
36 | */ |
37 | |
b3f05084 |
38 | #ifndef CATACOMB_DH_H |
39 | #define CATACOMB_DH_H |
44c240ee |
40 | |
41 | #ifdef __cplusplus |
42 | extern "C" { |
43 | #endif |
44 | |
45 | /*----- Header files ------------------------------------------------------*/ |
46 | |
052b36d0 |
47 | #ifndef CATACOMB_GRAND_H |
48 | # include "grand.h" |
44c240ee |
49 | #endif |
50 | |
052b36d0 |
51 | #ifndef CATACOMB_PGEN_H |
52 | # include "pgen.h" |
53 | #endif |
44c240ee |
54 | |
052b36d0 |
55 | /*----- Data structures ---------------------------------------------------*/ |
44c240ee |
56 | |
052b36d0 |
57 | typedef struct dh_param { |
58 | mp *p, *q; |
59 | mp *g; |
60 | } dh_param; |
44c240ee |
61 | |
62 | /*----- Functions provided ------------------------------------------------*/ |
63 | |
052b36d0 |
64 | /* --- @dh_gen@ --- * |
44c240ee |
65 | * |
052b36d0 |
66 | * Arguments: @dh_param *dp@ = pointer to output parameter block |
67 | * @unsigned ql@ = length of %$q$% in bits, or zero |
68 | * @unsigned pl@ = length of %$p$% in bits |
69 | * @unsigned steps@ = number of steps to go |
70 | * @grand *r@ = random number source |
71 | * @pgen_proc *event@ = event handler function |
72 | * @void *ectx@ = argument for the event handler |
44c240ee |
73 | * |
052b36d0 |
74 | * Returns: @PGEN_DONE@ if it worked, @PGEN_ABORT@ if it didn't. |
44c240ee |
75 | * |
052b36d0 |
76 | * Use: Generates Diffie-Hellman parameters. |
44c240ee |
77 | * |
052b36d0 |
78 | * The parameters are a prime %$q$%, relatively small, and a |
79 | * large prime %$p = kq + 1$% for some %$k$%, together with a |
80 | * generator %$g$% of the cyclic subgroup of order %$q$%. These |
81 | * are actually the same as the DSA parameter set, but the |
82 | * generation algorithm is different. Also, if @ql@ is zero, |
83 | * this algorithm forces %$k = 2$%, and chooses %$g = 4$%. Make |
84 | * sure you have something interesting to do if you choose this |
85 | * option. |
44c240ee |
86 | */ |
87 | |
052b36d0 |
88 | extern int dh_gen(dh_param */*dp*/, unsigned /*ql*/, unsigned /*pl*/, |
89 | unsigned /*steps*/, grand */*r*/, pgen_proc */*event*/, |
90 | void */*ectx*/); |
44c240ee |
91 | |
92 | /*----- That's all, folks -------------------------------------------------*/ |
93 | |
94 | #ifdef __cplusplus |
95 | } |
96 | #endif |
97 | |
98 | #endif |