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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: key-flags.c,v 1.3 2004/03/28 01:58:47 mdw Exp $ |
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4 | * |
5 | * Reading and writing key flag strings |
6 | * |
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: key-flags.c,v $ |
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33 | * Revision 1.3 2004/03/28 01:58:47 mdw |
34 | * Generate, store and retreive elliptic curve keys. |
35 | * |
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36 | * Revision 1.2 2000/02/12 18:21:02 mdw |
37 | * Overhaul of key management (again). |
38 | * |
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39 | * Revision 1.1 1999/12/22 15:47:48 mdw |
40 | * Major key-management revision. |
41 | * |
42 | */ |
43 | |
44 | /*----- Header files ------------------------------------------------------*/ |
45 | |
46 | #include <stdlib.h> |
47 | #include <string.h> |
48 | |
49 | #include <mLib/bits.h> |
50 | #include <mLib/dstr.h> |
51 | |
52 | #include "key.h" |
53 | |
54 | /*----- Data structures ---------------------------------------------------*/ |
55 | |
56 | typedef struct key_flags { |
57 | unsigned f; |
58 | unsigned m; |
59 | } key_flags; |
60 | |
61 | /*----- Flags table -------------------------------------------------------*/ |
62 | |
63 | typedef struct flagent { |
64 | const char *name; |
65 | unsigned f; |
66 | unsigned m; |
67 | } flagent; |
68 | |
69 | static flagent flagtab[] = { |
70 | |
71 | /* --- Encoding types --- */ |
72 | |
73 | { "binary", KENC_BINARY, KF_ENCMASK }, |
74 | { "integer", KENC_MP, KF_ENCMASK }, |
75 | { "struct", KENC_STRUCT, KF_ENCMASK }, |
76 | { "encrypt", KENC_ENCRYPT, KF_ENCMASK }, |
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77 | { "string", KENC_STRING, KF_ENCMASK }, |
78 | { "ec", KENC_EC, KF_ENCMASK }, |
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79 | |
80 | /* --- Classes of keys --- */ |
81 | |
82 | { "shared", KCAT_SHARE, KF_CATMASK }, |
83 | { "public", KCAT_PUB, KF_CATMASK }, |
84 | { "private", KCAT_PRIV, KF_CATMASK }, |
85 | { "symmetric", KCAT_SYMM, KF_CATMASK }, |
86 | { "secret", 0, KF_NONSECRET }, |
87 | { "-secret", KF_NONSECRET, KF_NONSECRET }, |
88 | |
89 | /* --- Other flags --- */ |
90 | |
91 | { "burn", KF_BURN, KF_BURN }, |
92 | { "-burn", 0, KF_BURN }, |
93 | |
94 | /* --- End marker --- */ |
95 | |
96 | { 0, 0, 0 } |
97 | }; |
98 | |
99 | /*----- Main code ---------------------------------------------------------*/ |
100 | |
101 | /* --- @key_readflags@ --- * |
102 | * |
103 | * Arguments: @const char *p@ = pointer to string to read |
104 | * @char **pp@ = where to store the end pointer |
105 | * @unsigned *ff@ = where to store the flags |
106 | * @unsigned *mm@ = where to store the mask |
107 | * |
108 | * Returns: Zero if all went well, nonzero if there was an error. |
109 | * |
110 | * Use: Reads a flag string. |
111 | */ |
112 | |
113 | int key_readflags(const char *p, char **pp, unsigned *ff, unsigned *mm) |
114 | { |
115 | unsigned f = 0, m = 0; |
116 | |
117 | for (;;) { |
118 | size_t sz = strcspn(p, ",:"); |
119 | flagent *e, *ee = 0; |
120 | |
121 | /* --- Look up the string in the flags table --- */ |
122 | |
123 | for (e = flagtab; e->name; e++) { |
124 | if (strncmp(e->name, p, sz) == 0) { |
125 | if (e->name[sz] == 0) { |
126 | ee = e; |
127 | break; |
128 | } else if (ee) |
129 | return (KERR_BADFLAGS); |
130 | else |
131 | ee = e; |
132 | } |
133 | } |
134 | if (!ee) |
135 | return (KERR_BADFLAGS); |
136 | |
137 | /* --- Adjust the flag words --- * |
138 | * |
139 | * Ensure that the flags set are disjoint. |
140 | */ |
141 | |
142 | if (m & ee->m) |
143 | return (KERR_BADFLAGS); |
144 | m |= ee->m; |
145 | f |= ee->f; |
146 | p += sz; |
147 | if (*p == 0 || *p == ':') |
148 | break; |
149 | p++; |
150 | } |
151 | |
152 | /* --- Report the results --- */ |
153 | |
154 | if (ff) *ff = f; |
155 | if (mm) *mm = m; |
156 | if (pp) *pp = (char *)p; |
157 | return (0); |
158 | } |
159 | |
160 | /* --- @key_writeflags@ --- * |
161 | * |
162 | * Arguments: @unsigned f@ = flags to write |
163 | * @dstr *d@ = pointer to destination string |
164 | * |
165 | * Returns: --- |
166 | * |
167 | * Use: Emits a flags word as a string representation. |
168 | */ |
169 | |
170 | void key_writeflags(unsigned f, dstr *d) |
171 | { |
172 | int del = 0; |
173 | flagent *e; |
174 | unsigned m = 0; |
175 | |
176 | for (e = flagtab; e->name; e++) { |
177 | if (m & e->m || e->name[0] == '-' || (f & e->m) != e->f) |
178 | continue; |
179 | if (del) |
180 | DPUTC(d, ','); |
181 | DPUTS(d, e->name); |
182 | m |= e->m; |
183 | del = 1; |
184 | } |
185 | } |
186 | |
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187 | /* --- @key_match@ --- * |
188 | * |
189 | * Arguments: @key_data *k@ = pointer to key data block |
190 | * @const key_filter *kf@ = pointer to filter block |
191 | * |
192 | * Returns: Nonzero if the key matches the filter. |
193 | * |
194 | * Use: Checks whether a key matches a filter. |
195 | */ |
196 | |
197 | int key_match(key_data *k, const key_filter *kf) |
198 | { |
199 | sym_iter i; |
200 | key_struct *ks; |
201 | |
202 | if (!kf) |
203 | return (1); |
204 | if ((k->e & KF_ENCMASK) != KENC_STRUCT) |
205 | return ((k->e & kf->m) == kf->f); |
206 | |
207 | for (sym_mkiter(&i, &k->u.s); (ks = sym_next(&i)) != 0; ) { |
208 | if (key_match(&ks->k, kf)) |
209 | return (1); |
210 | } |
211 | return (0); |
212 | } |
213 | |
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214 | /*----- That's all, folks -------------------------------------------------*/ |