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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: dh.h,v 1.4 2000/06/17 10:52:47 mdw Exp $ |
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4 | * |
5 | * Diffie-Hellman and related public-key systems |
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6 | * |
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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 $ |
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33 | * Revision 1.4 2000/06/17 10:52:47 mdw |
34 | * Minor changes for key fetching. |
35 | * |
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36 | * Revision 1.3 2000/02/12 18:21:02 mdw |
37 | * Overhaul of key management (again). |
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38 | * |
39 | */ |
40 | |
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41 | #ifndef CATACOMB_DH_H |
42 | #define CATACOMB_DH_H |
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43 | |
44 | #ifdef __cplusplus |
45 | extern "C" { |
46 | #endif |
47 | |
48 | /*----- Header files ------------------------------------------------------*/ |
49 | |
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50 | #ifndef CATACOMB_GRAND_H |
51 | # include "grand.h" |
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52 | #endif |
53 | |
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54 | #ifndef CATACOMB_KEY_H |
55 | # include "key.h" |
56 | #endif |
57 | |
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58 | #ifndef CATACOMB_PGEN_H |
59 | # include "pgen.h" |
60 | #endif |
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61 | |
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62 | /*----- Data structures ---------------------------------------------------*/ |
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63 | |
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64 | typedef struct dh_param { |
65 | mp *p, *q; |
66 | mp *g; |
67 | } dh_param; |
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68 | |
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69 | typedef struct dh_pub { |
70 | dh_param dp; |
71 | mp *y; |
72 | } dh_pub; |
73 | |
74 | typedef struct dh_priv { |
75 | dh_param dp; |
76 | mp *x; |
77 | mp *y; |
78 | } dh_priv; |
79 | |
80 | /*----- Key fetching ------------------------------------------------------*/ |
81 | |
82 | extern const key_fetchdef dh_paramfetch[]; |
83 | #define DH_PARAMFETCHSZ 5 |
84 | |
85 | extern const key_fetchdef dh_pubfetch[]; |
86 | #define DH_PUBFETCHSZ 6 |
87 | |
88 | extern const key_fetchdef dh_privfetch[]; |
89 | #define DH_PRIVFETCHSZ 9 |
90 | |
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91 | /*----- Functions provided ------------------------------------------------*/ |
92 | |
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93 | /* --- @dh_gen@ --- * |
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94 | * |
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95 | * Arguments: @dh_param *dp@ = pointer to output parameter block |
96 | * @unsigned ql@ = length of %$q$% in bits, or zero |
97 | * @unsigned pl@ = length of %$p$% in bits |
98 | * @unsigned steps@ = number of steps to go |
99 | * @grand *r@ = random number source |
100 | * @pgen_proc *event@ = event handler function |
101 | * @void *ectx@ = argument for the event handler |
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102 | * |
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103 | * Returns: @PGEN_DONE@ if it worked, @PGEN_ABORT@ if it didn't. |
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104 | * |
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105 | * Use: Generates Diffie-Hellman parameters. |
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106 | * |
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107 | * The parameters are a prime %$q$%, relatively small, and a |
108 | * large prime %$p = kq + 1$% for some %$k$%, together with a |
109 | * generator %$g$% of the cyclic subgroup of order %$q$%. These |
110 | * are actually the same as the DSA parameter set, but the |
111 | * generation algorithm is different. Also, if @ql@ is zero, |
112 | * this algorithm forces %$k = 2$%, and chooses %$g = 4$%. Make |
113 | * sure you have something interesting to do if you choose this |
114 | * option. |
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115 | */ |
116 | |
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117 | extern int dh_gen(dh_param */*dp*/, unsigned /*ql*/, unsigned /*pl*/, |
118 | unsigned /*steps*/, grand */*r*/, pgen_proc */*event*/, |
119 | void */*ectx*/); |
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120 | |
121 | /*----- That's all, folks -------------------------------------------------*/ |
122 | |
123 | #ifdef __cplusplus |
124 | } |
125 | #endif |
126 | |
127 | #endif |