34e4f738 |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: dh-param.c,v 1.1 2004/04/01 12:50:09 mdw Exp $ |
4 | * |
5 | * Reading Diffie-Hellman parameters |
6 | * |
7 | * (c) 2004 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-param.c,v $ |
33 | * Revision 1.1 2004/04/01 12:50:09 mdw |
34 | * Add cyclic group abstraction, with test code. Separate off exponentation |
35 | * functions for better static linking. Fix a buttload of bugs on the way. |
36 | * Generally ensure that negative exponents do inversion correctly. Add |
37 | * table of standard prime-field subgroups. (Binary field subgroups are |
38 | * currently unimplemented but easy to add if anyone ever finds a good one.) |
39 | * |
40 | */ |
41 | |
42 | /*----- Header files ------------------------------------------------------*/ |
43 | |
44 | #include "dh.h" |
45 | #include "ptab.h" |
46 | |
47 | /*----- Main code ---------------------------------------------------------*/ |
48 | |
49 | /* --- @dh_parse@ --- * |
50 | * |
51 | * Arguments: @qd_parse *qd@ = parser context |
52 | * @dh_param *dp@ = parameters to fill in |
53 | * |
54 | * Returns: Zero if OK, nonzero on error. |
55 | * |
56 | * Use: Parses a prime group string. This is either one of the |
57 | * standard group strings, or a %$p$%, %$q$%, %$g$% triple |
58 | * separated by commas. |
59 | */ |
60 | |
61 | static void getinfo(dh_param *dp, pdata *pd) |
62 | { dp->p = &pd->p; dp->q = &pd->q; dp->g = &pd->g; } |
63 | |
64 | int dh_parse(qd_parse *qd, dh_param *dp) |
65 | { |
66 | mp *p = MP_NEW, *q = MP_NEW, *g = MP_NEW; |
67 | const pentry *pe; |
68 | |
69 | for (pe = ptab; pe->name; pe++) { |
70 | if (qd_enum(qd, pe->name) >= 0) { |
71 | getinfo(dp, pe->data); |
72 | goto found; |
73 | } |
74 | } |
75 | if ((p = qd_getmp(qd)) == 0) goto fail; |
76 | qd_delim(qd, ','); if ((q = qd_getmp(qd)) == 0) goto fail; |
77 | qd_delim(qd, ','); if ((g = qd_getmp(qd)) == 0) goto fail; |
78 | dp->p = p; dp->q = q; dp->g = g; |
79 | found: |
80 | return (0); |
81 | |
82 | fail: |
83 | mp_drop(p); mp_drop(q); mp_drop(g); |
84 | return (-1); |
85 | } |
86 | |
87 | /*----- Test rig ----------------------------------------------------------*/ |
88 | |
89 | #ifdef TEST_RIG |
90 | |
91 | #include "fibrand.h" |
92 | |
93 | int main(void) |
94 | { |
95 | const pentry *pe; |
96 | const char *e; |
97 | int ok = 1; |
98 | grand *gr; |
99 | |
100 | gr = fibrand_create(0); |
101 | fputs("checking standard prime fields: ", stdout); |
102 | for (pe = ptab; pe->name; pe++) { |
103 | dh_param dp; |
104 | group *g; |
105 | getinfo(&dp, pe->data); |
106 | g = group_prime(&dp); |
107 | e = G_CHECK(g, gr); |
108 | G_DESTROYGROUP(g); |
109 | dh_paramfree(&dp); |
110 | if (e) { |
111 | fprintf(stderr, "\n*** group %s fails: %s\n", pe->name, e); |
112 | ok = 0; |
113 | } |
114 | putchar('.'); |
115 | fflush(stdout); |
116 | } |
117 | gr->ops->destroy(gr); |
118 | fputs(ok ? " ok\n" : " failed\n", stdout); |
119 | return (!ok); |
120 | } |
121 | |
122 | #endif |
123 | |
124 | /*----- That's all, folks -------------------------------------------------*/ |