34e4f738 |
1 | /* -*-c-*- |
34e4f738 |
2 | * |
3 | * Parse group description strings |
4 | * |
5 | * (c) 2004 Straylight/Edgeware |
6 | */ |
7 | |
45c0fd36 |
8 | /*----- Licensing notice --------------------------------------------------* |
34e4f738 |
9 | * |
10 | * This file is part of Trivial IP Encryption (TrIPE). |
11 | * |
12 | * TrIPE is free software; you can redistribute it and/or modify |
13 | * it under the terms of the GNU General Public License as published by |
14 | * the Free Software Foundation; either version 2 of the License, or |
15 | * (at your option) any later version. |
45c0fd36 |
16 | * |
34e4f738 |
17 | * TrIPE is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
20 | * GNU General Public License for more details. |
45c0fd36 |
21 | * |
34e4f738 |
22 | * You should have received a copy of the GNU General Public License |
23 | * along with TrIPE; if not, write to the Free Software Foundation, |
24 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
25 | */ |
26 | |
34e4f738 |
27 | /*----- Header files ------------------------------------------------------*/ |
28 | |
29 | #include "group.h" |
30 | #include "dh.h" |
31 | |
32 | /*----- Main code ---------------------------------------------------------*/ |
33 | |
34 | /* --- @group_parse@ --- * |
35 | * |
36 | * Arguments: @qd_parse *qd@ = quick-and-dirty parser |
37 | * |
38 | * Returns: Group pointer, or null for failure. |
39 | * |
40 | * Use: Parses a group description and returns the group. This has |
41 | * the form `TYPE { SPEC }' where TYPE is `prime' or `ec', and |
42 | * SPEC is the appropriate kind of group specification of the |
43 | * given type. |
44 | */ |
45 | |
46 | group *group_parse(qd_parse *qd) |
47 | { |
48 | group *g = 0; |
49 | |
50 | switch (qd_enum(qd, "prime,ec")) { |
51 | case 0: { |
52 | dh_param dp; |
53 | qd_delim(qd, '{'); |
f923fb18 |
54 | if (dh_parse(qd, &dp)) goto ouch; |
34e4f738 |
55 | qd_delim(qd, '}'); |
56 | g = group_prime(&dp); |
57 | dh_paramfree(&dp); |
58 | } break; |
59 | case 1: { |
60 | ec_info ei; |
61 | qd_delim(qd, '{'); |
f923fb18 |
62 | if (ec_infoparse(qd, &ei)) goto ouch; |
34e4f738 |
63 | qd_delim(qd, '}'); |
64 | g = group_ec(&ei); |
65 | } break; |
66 | } |
02d7884d |
67 | if (!g) qd->e = "bad group parameters"; |
f923fb18 |
68 | ouch: |
34e4f738 |
69 | return (g); |
70 | } |
71 | |
72 | /* --- @group_fromstring@ --- * |
73 | * |
74 | * Arguments: @const char *p@ = pointer to string to read |
75 | * @group **gg@ = where to put the group pointer |
76 | * |
77 | * Returns: Null if OK, or an error string. |
78 | * |
79 | * Use: Parses a group spec from a string, and returns the group. |
80 | */ |
81 | |
82 | const char *group_fromstring(const char *p, group **gg) |
83 | { |
84 | group *g; |
85 | qd_parse qd; |
86 | |
87 | qd.p = p; |
88 | qd.e = 0; |
89 | if ((g = group_parse(&qd)) == 0) return (qd.e); |
90 | if (!qd_eofp(&qd)) { G_DESTROYGROUP(g); return ("junk at end of string"); } |
91 | *gg = g; |
92 | return (0); |
93 | } |
94 | |
95 | /*----- That's all, folks -------------------------------------------------*/ |