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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: dh.h,v 1.6 2000/07/29 10:01:16 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 1.6 2000/07/29 10:01:16 mdw |
34 | * Supply commentry for the Diffie-Hellman parameters. Add Lim-Lee |
35 | * parameter generation. |
36 | * |
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37 | * Revision 1.5 2000/07/01 11:20:51 mdw |
38 | * New functions for freeing public and private keys. |
39 | * |
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40 | * Revision 1.4 2000/06/17 10:52:47 mdw |
41 | * Minor changes for key fetching. |
42 | * |
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43 | * Revision 1.3 2000/02/12 18:21:02 mdw |
44 | * Overhaul of key management (again). |
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45 | * |
46 | */ |
47 | |
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48 | #ifndef CATACOMB_DH_H |
49 | #define CATACOMB_DH_H |
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50 | |
51 | #ifdef __cplusplus |
52 | extern "C" { |
53 | #endif |
54 | |
55 | /*----- Header files ------------------------------------------------------*/ |
56 | |
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57 | #ifndef CATACOMB_GRAND_H |
58 | # include "grand.h" |
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59 | #endif |
60 | |
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61 | #ifndef CATACOMB_KEY_H |
62 | # include "key.h" |
63 | #endif |
64 | |
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65 | #ifndef CATACOMB_PGEN_H |
66 | # include "pgen.h" |
67 | #endif |
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68 | |
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69 | /*----- Data structures ---------------------------------------------------*/ |
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70 | |
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71 | typedef struct dh_param { /* Prime numbers %$p$% and %$q$% */ |
72 | mp *p, *q; /* Generates order-%$q$% subgroup */ |
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73 | mp *g; |
74 | } dh_param; |
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75 | |
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76 | typedef struct dh_pub { /* Shared parameters */ |
77 | dh_param dp; /* Public key */ |
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78 | mp *y; |
79 | } dh_pub; |
80 | |
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81 | typedef struct dh_priv { /* Shared parameters */ |
82 | dh_param dp; /* Private key */ |
83 | mp *x; /* %$y \equiv g^x \pmod{p}$% */ |
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84 | mp *y; |
85 | } dh_priv; |
86 | |
87 | /*----- Key fetching ------------------------------------------------------*/ |
88 | |
89 | extern const key_fetchdef dh_paramfetch[]; |
90 | #define DH_PARAMFETCHSZ 5 |
91 | |
92 | extern const key_fetchdef dh_pubfetch[]; |
93 | #define DH_PUBFETCHSZ 6 |
94 | |
95 | extern const key_fetchdef dh_privfetch[]; |
96 | #define DH_PRIVFETCHSZ 9 |
97 | |
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98 | /* --- @dh_paramfree@, @dh_pubfree@, @dh_privfree@ --- * |
99 | * |
100 | * Arguments: @dh_param *dp@, @dh_pub *dp@, @dh_priv *dp@ = pointer to |
101 | * key block to free |
102 | * |
103 | * Returns: --- |
104 | * |
105 | * Use: Frees a Diffie-Hellman key block. |
106 | */ |
107 | |
108 | extern void dh_paramfree(dh_param */*dp*/); |
109 | extern void dh_pubfree(dh_pub */*dp*/); |
110 | extern void dh_privfree(dh_priv */*dp*/); |
111 | |
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112 | /*----- Functions provided ------------------------------------------------*/ |
113 | |
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114 | /* --- @dh_gen@ --- * |
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115 | * |
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116 | * Arguments: @dh_param *dp@ = pointer to output parameter block |
117 | * @unsigned ql@ = length of %$q$% in bits, or zero |
118 | * @unsigned pl@ = length of %$p$% in bits |
119 | * @unsigned steps@ = number of steps to go |
120 | * @grand *r@ = random number source |
121 | * @pgen_proc *event@ = event handler function |
122 | * @void *ectx@ = argument for the event handler |
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123 | * |
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124 | * Returns: @PGEN_DONE@ if it worked, @PGEN_ABORT@ if it didn't. |
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125 | * |
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126 | * Use: Generates Diffie-Hellman parameters. |
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127 | * |
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128 | * The parameters are a prime %$q$%, relatively small, and a |
129 | * large prime %$p = kq + 1$% for some %$k$%, together with a |
130 | * generator %$g$% of the cyclic subgroup of order %$q$%. These |
131 | * are actually the same as the DSA parameter set, but the |
132 | * generation algorithm is different. Also, if @ql@ is zero, |
133 | * this algorithm forces %$k = 2$%, and chooses %$g = 4$%. Make |
134 | * sure you have something interesting to do if you choose this |
135 | * option. |
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136 | */ |
137 | |
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138 | extern int dh_gen(dh_param */*dp*/, unsigned /*ql*/, unsigned /*pl*/, |
139 | unsigned /*steps*/, grand */*r*/, pgen_proc */*event*/, |
140 | void */*ectx*/); |
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141 | |
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142 | /* --- @dh_limlee@ --- * |
143 | * |
144 | * Arguments: @dh_param *dp@ = pointer to output parameter block |
145 | * @unsigned ql@ = length of smallest factor of %$(p - 1)/2$% |
146 | * @unsigned pl@ = length of %$p$% in bits |
147 | * @unsigned flags@ = other generation flags |
148 | * @unsigned steps@ = number of steps to go |
149 | * @grand *r@ = random number source |
150 | * @pgen_proc *oev@ = outer event handler function |
151 | * @void *oec@ = argument for the outer event handler |
152 | * @pgen_proc *iev@ = inner event handler function |
153 | * @void *iec@ = argument for the inner event handler |
154 | * @size_t *nf@, @mp ***f@ = output array for factors |
155 | * |
156 | * Returns: @PGEN_DONE@ if it worked, @PGEN_ABORT@ if it didn't. |
157 | * |
158 | * Use: Generates Diffie-Hellman parameters based on a Lim-Lee prime. |
159 | * |
160 | * The modulus is a large prime %$p = 2 \prod q_i + 1$%, @pl@ |
161 | * bits long, where the %$q_i$% are smaller primes each at least |
162 | * @ql@ bits long. It is safe to set @nf@ and @f@ to zero if |
163 | * you're not interested in the factor values. |
164 | * |
165 | * The returned %$g$% generates a subgroup of order %$q_0$% (the |
166 | * first factor, returned as @f[0]@), if the flag @DH_SUBGROUP@ |
167 | * is set on entry; otherwise %$g$% will have order |
168 | * %$(p - 1)/2$%. |
169 | */ |
170 | |
171 | #define DH_SUBGROUP 1u |
172 | |
173 | extern int dh_limlee(dh_param */*dp*/, unsigned /*ql*/, unsigned /*pl*/, |
174 | unsigned /*flags*/, unsigned /*steps*/, grand */*r*/, |
175 | pgen_proc */*oev*/, void */*oec*/, pgen_proc */*iev*/, |
176 | void */*iec*/, size_t */*nf*/, mp ***/*f*/); |
177 | |
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178 | /*----- That's all, folks -------------------------------------------------*/ |
179 | |
180 | #ifdef __cplusplus |
181 | } |
182 | #endif |
183 | |
184 | #endif |