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