3 * $Id: dh-param.c,v 1.1 2004/04/01 12:50:09 mdw Exp $
5 * Reading Diffie-Hellman parameters
7 * (c) 2004 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of Catacomb.
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.
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.
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,
30 /*----- Revision history --------------------------------------------------*
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.)
42 /*----- Header files ------------------------------------------------------*/
47 /*----- Main code ---------------------------------------------------------*/
49 /* --- @dh_parse@ --- *
51 * Arguments: @qd_parse *qd@ = parser context
52 * @dh_param *dp@ = parameters to fill in
54 * Returns: Zero if OK, nonzero on error.
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.
61 static void getinfo(dh_param
*dp
, pdata
*pd
)
62 { dp
->p
= &pd
->p
; dp
->q
= &pd
->q
; dp
->g
= &pd
->g
; }
64 int dh_parse(qd_parse
*qd
, dh_param
*dp
)
66 mp
*p
= MP_NEW
, *q
= MP_NEW
, *g
= MP_NEW
;
69 for (pe
= ptab
; pe
->name
; pe
++) {
70 if (qd_enum(qd
, pe
->name
) >= 0) {
71 getinfo(dp
, pe
->data
);
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
;
83 mp_drop(p
); mp_drop(q
); mp_drop(g
);
87 /*----- Test rig ----------------------------------------------------------*/
100 gr
= fibrand_create(0);
101 fputs("checking standard prime fields: ", stdout
);
102 for (pe
= ptab
; pe
->name
; pe
++) {
105 getinfo(&dp
, pe
->data
);
106 g
= group_prime(&dp
);
111 fprintf(stderr
, "\n*** group %s fails: %s\n", pe
->name
, e
);
117 gr
->ops
->destroy(gr
);
118 fputs(ok ?
" ok\n" : " failed\n", stdout
);
124 /*----- That's all, folks -------------------------------------------------*/