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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: key-data.c,v 1.5 2004/03/28 01:58:47 mdw Exp $ |
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4 | * |
5 | * Encoding and decoding of key data |
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-data.c,v $ |
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33 | * Revision 1.5 2004/03/28 01:58:47 mdw |
34 | * Generate, store and retreive elliptic curve keys. |
35 | * |
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36 | * Revision 1.4 2000/07/16 19:51:58 mdw |
37 | * Shut stupid compiler up. |
38 | * |
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39 | * Revision 1.3 2000/06/17 11:26:03 mdw |
40 | * key_structfind: track minor data structure change, and cope if the |
41 | * subkey isn't available. |
42 | * |
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43 | * Revision 1.2 2000/02/12 18:21:02 mdw |
44 | * Overhaul of key management (again). |
45 | * |
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46 | * Revision 1.1 1999/12/22 15:47:48 mdw |
47 | * Major key-management revision. |
48 | * |
49 | */ |
50 | |
51 | /*----- Header files ------------------------------------------------------*/ |
52 | |
53 | #include <assert.h> |
54 | #include <stdlib.h> |
55 | #include <string.h> |
56 | |
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57 | #include <mLib/base64.h> |
58 | #include <mLib/bits.h> |
59 | #include <mLib/dstr.h> |
60 | #include <mLib/sub.h> |
61 | #include <mLib/sym.h> |
62 | |
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63 | #include "key-data.h" |
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64 | #include "mp.h" |
65 | #include "mptext.h" |
66 | |
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67 | /*----- Setting new values ------------------------------------------------*/ |
68 | |
69 | /* --- @key_binary@ --- * |
70 | * |
71 | * Arguments: @key_data *k@ = pointer to key data block |
72 | * @const void *p@ = pointer to key data |
73 | * @size_t sz@ = size of the key data |
74 | * |
75 | * Returns: --- |
76 | * |
77 | * Use: Sets a binary key in a key data block. |
78 | */ |
79 | |
80 | void key_binary(key_data *k, const void *p, size_t sz) |
81 | { |
82 | k->e = (k->e & ~KF_ENCMASK) | KENC_BINARY; |
83 | k->u.k.k = sub_alloc(sz); |
84 | memcpy(k->u.k.k, p, sz); |
85 | k->u.k.sz = sz; |
86 | } |
87 | |
88 | /* --- @key_encrypted@ --- * |
89 | * |
90 | * Arguments: @key_data *k@ = pointer to key data block |
91 | * @const void *p@ = pointer to key data |
92 | * @size_t sz@ = size of the key data |
93 | * |
94 | * Returns: --- |
95 | * |
96 | * Use: Sets an encrypted key in a key data block. |
97 | */ |
98 | |
99 | void key_encrypted(key_data *k, const void *p, size_t sz) |
100 | { |
101 | k->e = (k->e & ~KF_ENCMASK) | KENC_ENCRYPT; |
102 | k->u.k.k = sub_alloc(sz); |
103 | memcpy(k->u.k.k, p, sz); |
104 | k->u.k.sz = sz; |
105 | } |
106 | |
107 | /* --- @key_mp@ --- * |
108 | * |
109 | * Arguments: @key_data *k@ = pointer to key data block |
110 | * @mp *m@ = pointer to the value to set |
111 | * |
112 | * Returns: --- |
113 | * |
114 | * Use: Sets a multiprecision integer key in a key block. |
115 | */ |
116 | |
117 | void key_mp(key_data *k, mp *m) |
118 | { |
119 | k->e = (k->e & ~KF_ENCMASK) | KENC_MP; |
120 | k->u.m = MP_COPY(m); |
121 | } |
122 | |
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123 | /* --- @key_string@ --- * |
124 | * |
125 | * Arguments: @key_data *k@ = pointer to key data block |
126 | * @const char *p@ = pointer to the value to set |
127 | * |
128 | * Returns: --- |
129 | * |
130 | * Use: Sets a plain string in a key block. |
131 | */ |
132 | |
133 | void key_string(key_data *k, const char *p) |
134 | { |
135 | k->e = (k->e & ~KF_ENCMASK) | KENC_STRING; |
136 | k->u.p = xstrdup(p); |
137 | } |
138 | |
139 | /* --- @key_ec@ --- * |
140 | * |
141 | * Arguments: @key_data *k@ = pointer to key data block |
142 | * @const ec *e@ = pointer to the value to set |
143 | * |
144 | * Returns: --- |
145 | * |
146 | * Use: Sets an elliptic curve point in a key block. |
147 | */ |
148 | |
149 | void key_ec(key_data *k, const ec *e) |
150 | { |
151 | k->e = (k->e & ~KF_ENCMASK) | KENC_EC; |
152 | EC_CREATE(&k->u.e); |
153 | EC_COPY(&k->u.e, e); |
154 | } |
155 | |
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156 | /* --- @key_structure@ --- * |
157 | * |
158 | * Arguments: @key_data *k@ = pointer to key data block |
159 | * |
160 | * Returns: --- |
161 | * |
162 | * Use: Initializes a structured key type. |
163 | */ |
164 | |
165 | void key_structure(key_data *k) |
166 | { |
167 | k->e = KENC_STRUCT; |
168 | sym_create(&k->u.s); |
169 | } |
170 | |
171 | /* --- @key_structfind@ --- * |
172 | * |
173 | * Arguments: @key_data *k@ = pointer to key data block |
174 | * @const char *tag@ = pointer to tag string |
175 | * |
176 | * Returns: Pointer to key data block, or null. |
177 | * |
178 | * Use: Looks up the tag in a structured key. |
179 | */ |
180 | |
181 | key_data *key_structfind(key_data *k, const char *tag) |
182 | { |
183 | key_struct *ks; |
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184 | assert(((void)"Key is not structured", |
185 | (k->e & KF_ENCMASK) == KENC_STRUCT)); |
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186 | ks = sym_find(&k->u.s, tag, -1, 0, 0); |
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187 | if (!ks) |
188 | return (0); |
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189 | return (&ks->k); |
190 | } |
191 | |
192 | /* --- @key_structcreate@ --- * |
193 | * |
194 | * Arguments: @key_data *k@ = pointer to key data block |
195 | * @const char *tag@ = pointer to tag string |
196 | * |
197 | * Returns: Pointer to newly created key data. |
198 | * |
199 | * Use: Creates a new uninitialized subkey. |
200 | */ |
201 | |
202 | key_data *key_structcreate(key_data *k, const char *tag) |
203 | { |
204 | key_struct *ks; |
205 | unsigned f; |
206 | |
207 | assert(((void)"Key is not structured", k->e == KENC_STRUCT)); |
208 | ks = sym_find(&k->u.s, tag, -1, sizeof(*ks), &f); |
209 | if (f) |
210 | key_destroy(&ks->k); |
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211 | ks->k.e = KF_TEMP; |
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212 | return (&ks->k); |
213 | } |
214 | |
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215 | /*----- Miscellaneous operations ------------------------------------------*/ |
216 | |
217 | /* --- @key_destroy@ --- * |
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218 | * |
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219 | * Arguments: @key_data *k@ = pointer to key data to destroy |
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220 | * |
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221 | * Returns: --- |
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222 | * |
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223 | * Use: Destroys a lump of key data. |
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224 | */ |
225 | |
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226 | void key_destroy(key_data *k) |
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227 | { |
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228 | switch (k->e & KF_ENCMASK) { |
229 | case KENC_BINARY: |
230 | case KENC_ENCRYPT: |
231 | if (k->e & KF_BURN) |
232 | memset(k->u.k.k, 0, k->u.k.sz); |
233 | sub_free(k->u.k.k, k->u.k.sz); |
234 | break; |
235 | case KENC_MP: |
236 | mp_drop(k->u.m); |
237 | break; |
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238 | case KENC_STRING: |
239 | xfree(k->u.p); |
240 | break; |
241 | case KENC_EC: |
242 | EC_DESTROY(&k->u.e); |
243 | break; |
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244 | case KENC_STRUCT: { |
245 | sym_iter i; |
246 | key_struct *ks; |
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247 | |
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248 | for (sym_mkiter(&i, &k->u.s); (ks = sym_next(&i)) != 0; ) { |
249 | if (!(ks->k.e & KF_TEMP)) |
250 | key_destroy(&ks->k); |
251 | } |
252 | sym_destroy(&k->u.s); |
253 | } break; |
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254 | } |
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255 | } |
256 | |
257 | /* --- @key_do@ --- * |
258 | * |
259 | * Arguments: @key_data *k@ = pointer to key data block |
260 | * @const key_filter *kf@ = pointer to filter block |
261 | * @dstr *d@ = pointer to base string |
262 | * @int (*func)(key_data *kd, dstr *d, void *p@ = function |
263 | * @void *p@ = argument to function |
264 | * |
265 | * Returns: Nonzero return code from function, or zero. |
266 | * |
267 | * Use: Runs a function over all the leaves of a key. |
268 | */ |
269 | |
270 | int key_do(key_data *k, const key_filter *kf, dstr *d, |
271 | int (*func)(key_data */*kd*/, dstr */*d*/, void */*p*/), |
272 | void *p) |
273 | { |
274 | if (!KEY_MATCH(k, kf)) |
275 | return (0); |
276 | if ((k->e & KF_ENCMASK) != KENC_STRUCT) |
277 | return (func(k, d, p)); |
278 | else { |
279 | sym_iter i; |
280 | key_struct *ks; |
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281 | size_t n = 0; |
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282 | int rc; |
283 | |
284 | if (d) |
285 | n = d->len; |
286 | for (sym_mkiter(&i, &k->u.s); (ks = sym_next(&i)) != 0; ) { |
287 | if (d) { |
288 | d->len = n; |
289 | dstr_putf(d, ".%s", SYM_NAME(ks)); |
290 | } |
291 | if ((rc = key_do(&ks->k, kf, d, func, p)) != 0) |
292 | return (rc); |
293 | } |
294 | return (0); |
295 | } |
296 | } |
297 | |
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298 | /* --- @key_copy@ --- * |
299 | * |
300 | * Arguments: @key_data *kd@ = pointer to destination data block |
301 | * @key_data *k@ = pointer to source data block |
302 | * @const key_filter *kf@ = pointer to filter block |
303 | * |
304 | * Returns: Nonzero if an item was actually copied. |
305 | * |
306 | * Use: Copies a chunk of key data from one place to another. |
307 | */ |
308 | |
309 | int key_copy(key_data *kd, key_data *k, const key_filter *kf) |
310 | { |
311 | kd->e = k->e; |
312 | |
313 | if (!KEY_MATCH(kd, kf)) |
314 | return (0); |
315 | switch (k->e & KF_ENCMASK) { |
316 | |
317 | /* --- Plain binary data --- */ |
318 | |
319 | case KENC_BINARY: |
320 | case KENC_ENCRYPT: |
321 | kd->u.k.k = sub_alloc(k->u.k.sz); |
322 | memcpy(kd->u.k.k, k->u.k.k, k->u.k.sz); |
323 | kd->u.k.sz = k->u.k.sz; |
324 | break; |
325 | |
326 | /* --- Multiprecision integers --- */ |
327 | |
328 | case KENC_MP: |
329 | kd->u.m = MP_COPY(k->u.m); |
330 | break; |
331 | |
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332 | /* --- Strings --- */ |
333 | |
334 | case KENC_STRING: |
335 | kd->u.p = xstrdup(k->u.p); |
336 | break; |
337 | |
338 | /* --- Elliptic curve points --- */ |
339 | |
340 | case KENC_EC: |
341 | EC_CREATE(&kd->u.e); |
342 | EC_COPY(&kd->u.e, &k->u.e); |
343 | break; |
344 | |
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345 | /* --- Structured key data --- */ |
346 | |
347 | case KENC_STRUCT: { |
348 | sym_iter i; |
349 | key_struct *ks; |
350 | int rc = 0; |
351 | |
352 | sym_create(&kd->u.s); |
353 | for (sym_mkiter(&i, &k->u.s); (ks = sym_next(&i)) != 0; ) { |
354 | unsigned f; |
355 | key_struct *kks = sym_find(&kd->u.s, SYM_NAME(ks), -1, |
356 | sizeof(*kks), &f); |
357 | assert(((void)"Duplicate subkey tags", !f)); |
358 | if (key_copy(&kks->k, &ks->k, kf)) |
359 | rc = 1; |
360 | else |
361 | sym_remove(&kd->u.s, kks); |
362 | } |
363 | if (!rc) { |
364 | sym_destroy(&kd->u.s); |
365 | return (0); |
366 | } |
367 | } break; |
368 | } |
369 | return (1); |
370 | } |
371 | |
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372 | /*----- That's all, folks -------------------------------------------------*/ |