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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: key-data.c,v 1.6 2004/04/08 01:36:15 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 | |
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30 | /*----- Header files ------------------------------------------------------*/ |
31 | |
32 | #include <assert.h> |
33 | #include <stdlib.h> |
34 | #include <string.h> |
35 | |
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36 | #include <mLib/base64.h> |
37 | #include <mLib/bits.h> |
38 | #include <mLib/dstr.h> |
39 | #include <mLib/sub.h> |
40 | #include <mLib/sym.h> |
41 | |
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42 | #include "key-data.h" |
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43 | #include "mp.h" |
44 | #include "mptext.h" |
45 | |
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46 | /*----- Setting new values ------------------------------------------------*/ |
47 | |
48 | /* --- @key_binary@ --- * |
49 | * |
50 | * Arguments: @key_data *k@ = pointer to key data block |
51 | * @const void *p@ = pointer to key data |
52 | * @size_t sz@ = size of the key data |
53 | * |
54 | * Returns: --- |
55 | * |
56 | * Use: Sets a binary key in a key data block. |
57 | */ |
58 | |
59 | void key_binary(key_data *k, const void *p, size_t sz) |
60 | { |
61 | k->e = (k->e & ~KF_ENCMASK) | KENC_BINARY; |
62 | k->u.k.k = sub_alloc(sz); |
63 | memcpy(k->u.k.k, p, sz); |
64 | k->u.k.sz = sz; |
65 | } |
66 | |
67 | /* --- @key_encrypted@ --- * |
68 | * |
69 | * Arguments: @key_data *k@ = pointer to key data block |
70 | * @const void *p@ = pointer to key data |
71 | * @size_t sz@ = size of the key data |
72 | * |
73 | * Returns: --- |
74 | * |
75 | * Use: Sets an encrypted key in a key data block. |
76 | */ |
77 | |
78 | void key_encrypted(key_data *k, const void *p, size_t sz) |
79 | { |
80 | k->e = (k->e & ~KF_ENCMASK) | KENC_ENCRYPT; |
81 | k->u.k.k = sub_alloc(sz); |
82 | memcpy(k->u.k.k, p, sz); |
83 | k->u.k.sz = sz; |
84 | } |
85 | |
86 | /* --- @key_mp@ --- * |
87 | * |
88 | * Arguments: @key_data *k@ = pointer to key data block |
89 | * @mp *m@ = pointer to the value to set |
90 | * |
91 | * Returns: --- |
92 | * |
93 | * Use: Sets a multiprecision integer key in a key block. |
94 | */ |
95 | |
96 | void key_mp(key_data *k, mp *m) |
97 | { |
98 | k->e = (k->e & ~KF_ENCMASK) | KENC_MP; |
99 | k->u.m = MP_COPY(m); |
100 | } |
101 | |
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102 | /* --- @key_string@ --- * |
103 | * |
104 | * Arguments: @key_data *k@ = pointer to key data block |
105 | * @const char *p@ = pointer to the value to set |
106 | * |
107 | * Returns: --- |
108 | * |
109 | * Use: Sets a plain string in a key block. |
110 | */ |
111 | |
112 | void key_string(key_data *k, const char *p) |
113 | { |
114 | k->e = (k->e & ~KF_ENCMASK) | KENC_STRING; |
115 | k->u.p = xstrdup(p); |
116 | } |
117 | |
118 | /* --- @key_ec@ --- * |
119 | * |
120 | * Arguments: @key_data *k@ = pointer to key data block |
121 | * @const ec *e@ = pointer to the value to set |
122 | * |
123 | * Returns: --- |
124 | * |
125 | * Use: Sets an elliptic curve point in a key block. |
126 | */ |
127 | |
128 | void key_ec(key_data *k, const ec *e) |
129 | { |
130 | k->e = (k->e & ~KF_ENCMASK) | KENC_EC; |
131 | EC_CREATE(&k->u.e); |
132 | EC_COPY(&k->u.e, e); |
133 | } |
134 | |
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135 | /* --- @key_structure@ --- * |
136 | * |
137 | * Arguments: @key_data *k@ = pointer to key data block |
138 | * |
139 | * Returns: --- |
140 | * |
141 | * Use: Initializes a structured key type. |
142 | */ |
143 | |
144 | void key_structure(key_data *k) |
145 | { |
146 | k->e = KENC_STRUCT; |
147 | sym_create(&k->u.s); |
148 | } |
149 | |
150 | /* --- @key_structfind@ --- * |
151 | * |
152 | * Arguments: @key_data *k@ = pointer to key data block |
153 | * @const char *tag@ = pointer to tag string |
154 | * |
155 | * Returns: Pointer to key data block, or null. |
156 | * |
157 | * Use: Looks up the tag in a structured key. |
158 | */ |
159 | |
160 | key_data *key_structfind(key_data *k, const char *tag) |
161 | { |
162 | key_struct *ks; |
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163 | assert(((void)"Key is not structured", |
164 | (k->e & KF_ENCMASK) == KENC_STRUCT)); |
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165 | ks = sym_find(&k->u.s, tag, -1, 0, 0); |
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166 | if (!ks) |
167 | return (0); |
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168 | return (&ks->k); |
169 | } |
170 | |
171 | /* --- @key_structcreate@ --- * |
172 | * |
173 | * Arguments: @key_data *k@ = pointer to key data block |
174 | * @const char *tag@ = pointer to tag string |
175 | * |
176 | * Returns: Pointer to newly created key data. |
177 | * |
178 | * Use: Creates a new uninitialized subkey. |
179 | */ |
180 | |
181 | key_data *key_structcreate(key_data *k, const char *tag) |
182 | { |
183 | key_struct *ks; |
184 | unsigned f; |
185 | |
186 | assert(((void)"Key is not structured", k->e == KENC_STRUCT)); |
187 | ks = sym_find(&k->u.s, tag, -1, sizeof(*ks), &f); |
188 | if (f) |
189 | key_destroy(&ks->k); |
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190 | ks->k.e = KF_TEMP; |
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191 | return (&ks->k); |
192 | } |
193 | |
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194 | /*----- Miscellaneous operations ------------------------------------------*/ |
195 | |
196 | /* --- @key_destroy@ --- * |
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197 | * |
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198 | * Arguments: @key_data *k@ = pointer to key data to destroy |
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199 | * |
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200 | * Returns: --- |
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201 | * |
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202 | * Use: Destroys a lump of key data. |
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203 | */ |
204 | |
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205 | void key_destroy(key_data *k) |
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206 | { |
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207 | switch (k->e & KF_ENCMASK) { |
208 | case KENC_BINARY: |
209 | case KENC_ENCRYPT: |
210 | if (k->e & KF_BURN) |
211 | memset(k->u.k.k, 0, k->u.k.sz); |
212 | sub_free(k->u.k.k, k->u.k.sz); |
213 | break; |
214 | case KENC_MP: |
215 | mp_drop(k->u.m); |
216 | break; |
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217 | case KENC_STRING: |
218 | xfree(k->u.p); |
219 | break; |
220 | case KENC_EC: |
221 | EC_DESTROY(&k->u.e); |
222 | break; |
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223 | case KENC_STRUCT: { |
224 | sym_iter i; |
225 | key_struct *ks; |
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226 | |
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227 | for (sym_mkiter(&i, &k->u.s); (ks = sym_next(&i)) != 0; ) { |
228 | if (!(ks->k.e & KF_TEMP)) |
229 | key_destroy(&ks->k); |
230 | } |
231 | sym_destroy(&k->u.s); |
232 | } break; |
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233 | } |
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234 | } |
235 | |
236 | /* --- @key_do@ --- * |
237 | * |
238 | * Arguments: @key_data *k@ = pointer to key data block |
239 | * @const key_filter *kf@ = pointer to filter block |
240 | * @dstr *d@ = pointer to base string |
241 | * @int (*func)(key_data *kd, dstr *d, void *p@ = function |
242 | * @void *p@ = argument to function |
243 | * |
244 | * Returns: Nonzero return code from function, or zero. |
245 | * |
246 | * Use: Runs a function over all the leaves of a key. |
247 | */ |
248 | |
249 | int key_do(key_data *k, const key_filter *kf, dstr *d, |
250 | int (*func)(key_data */*kd*/, dstr */*d*/, void */*p*/), |
251 | void *p) |
252 | { |
253 | if (!KEY_MATCH(k, kf)) |
254 | return (0); |
255 | if ((k->e & KF_ENCMASK) != KENC_STRUCT) |
256 | return (func(k, d, p)); |
257 | else { |
258 | sym_iter i; |
259 | key_struct *ks; |
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260 | size_t n = 0; |
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261 | int rc; |
262 | |
263 | if (d) |
264 | n = d->len; |
265 | for (sym_mkiter(&i, &k->u.s); (ks = sym_next(&i)) != 0; ) { |
266 | if (d) { |
267 | d->len = n; |
268 | dstr_putf(d, ".%s", SYM_NAME(ks)); |
269 | } |
270 | if ((rc = key_do(&ks->k, kf, d, func, p)) != 0) |
271 | return (rc); |
272 | } |
273 | return (0); |
274 | } |
275 | } |
276 | |
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277 | /* --- @key_copy@ --- * |
278 | * |
279 | * Arguments: @key_data *kd@ = pointer to destination data block |
280 | * @key_data *k@ = pointer to source data block |
281 | * @const key_filter *kf@ = pointer to filter block |
282 | * |
283 | * Returns: Nonzero if an item was actually copied. |
284 | * |
285 | * Use: Copies a chunk of key data from one place to another. |
286 | */ |
287 | |
288 | int key_copy(key_data *kd, key_data *k, const key_filter *kf) |
289 | { |
290 | kd->e = k->e; |
291 | |
292 | if (!KEY_MATCH(kd, kf)) |
293 | return (0); |
294 | switch (k->e & KF_ENCMASK) { |
295 | |
296 | /* --- Plain binary data --- */ |
297 | |
298 | case KENC_BINARY: |
299 | case KENC_ENCRYPT: |
300 | kd->u.k.k = sub_alloc(k->u.k.sz); |
301 | memcpy(kd->u.k.k, k->u.k.k, k->u.k.sz); |
302 | kd->u.k.sz = k->u.k.sz; |
303 | break; |
304 | |
305 | /* --- Multiprecision integers --- */ |
306 | |
307 | case KENC_MP: |
308 | kd->u.m = MP_COPY(k->u.m); |
309 | break; |
310 | |
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311 | /* --- Strings --- */ |
312 | |
313 | case KENC_STRING: |
314 | kd->u.p = xstrdup(k->u.p); |
315 | break; |
316 | |
317 | /* --- Elliptic curve points --- */ |
318 | |
319 | case KENC_EC: |
320 | EC_CREATE(&kd->u.e); |
321 | EC_COPY(&kd->u.e, &k->u.e); |
322 | break; |
323 | |
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324 | /* --- Structured key data --- */ |
325 | |
326 | case KENC_STRUCT: { |
327 | sym_iter i; |
328 | key_struct *ks; |
329 | int rc = 0; |
330 | |
331 | sym_create(&kd->u.s); |
332 | for (sym_mkiter(&i, &k->u.s); (ks = sym_next(&i)) != 0; ) { |
333 | unsigned f; |
334 | key_struct *kks = sym_find(&kd->u.s, SYM_NAME(ks), -1, |
335 | sizeof(*kks), &f); |
336 | assert(((void)"Duplicate subkey tags", !f)); |
337 | if (key_copy(&kks->k, &ks->k, kf)) |
338 | rc = 1; |
339 | else |
340 | sym_remove(&kd->u.s, kks); |
341 | } |
342 | if (!rc) { |
343 | sym_destroy(&kd->u.s); |
344 | return (0); |
345 | } |
346 | } break; |
347 | } |
348 | return (1); |
349 | } |
350 | |
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351 | /*----- That's all, folks -------------------------------------------------*/ |