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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: ecb-def.h,v 1.2 2000/06/17 10:54:43 mdw Exp $ |
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4 | * |
5 | * Definitions electronic code book mode |
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: ecb-def.h,v $ |
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33 | * Revision 1.2 2000/06/17 10:54:43 mdw |
34 | * Use secure arena for memory allocation. |
35 | * |
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36 | * Revision 1.1 1999/12/10 23:16:39 mdw |
37 | * Split mode macros into interface and implementation. |
38 | * |
39 | */ |
40 | |
41 | #ifndef CATACOMB_ECB_DEF_H |
42 | #define CATACOMB_ECB_DEF_H |
43 | |
44 | #ifdef __cplusplus |
45 | extern "C" { |
46 | #endif |
47 | |
48 | /*----- Header files ------------------------------------------------------*/ |
49 | |
50 | #include <assert.h> |
51 | #include <string.h> |
52 | |
53 | #include <mLib/bits.h> |
54 | #include <mLib/sub.h> |
55 | |
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56 | #ifndef CATACOMB_ARENA_H |
57 | # include "arena.h" |
58 | #endif |
59 | |
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60 | #ifndef CATACOMB_BLKC_H |
61 | # include "blkc.h" |
62 | #endif |
63 | |
64 | #ifndef CATACOMB_GCIPHER_H |
65 | # include "gcipher.h" |
66 | #endif |
67 | |
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68 | #ifndef CATACOMB_PARANOIA_H |
69 | # include "paranoia.h" |
70 | #endif |
71 | |
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72 | /*----- Macros ------------------------------------------------------------*/ |
73 | |
74 | /* --- @ECB_DEF@ --- * |
75 | * |
76 | * Arguments: @PRE@, @pre@ = prefixes for the underlying block cipher |
77 | * |
78 | * Use: Creates an implementation for ECB stealing mode. |
79 | */ |
80 | |
81 | #define ECB_DEF(PRE, pre) \ |
82 | \ |
83 | /* --- @pre_ecbsetkey@ --- * \ |
84 | * \ |
85 | * Arguments: @pre_ecbctx *ctx@ = pointer to ECB context block \ |
86 | * @const pre_ctx *k@ = pointer to cipher context \ |
87 | * \ |
88 | * Returns: --- \ |
89 | * \ |
90 | * Use: Sets the ECB context to use a different cipher key. \ |
91 | */ \ |
92 | \ |
93 | void pre##_ecbsetkey(pre##_ecbctx *ctx, const pre##_ctx *k) \ |
94 | { \ |
95 | ctx->ctx = *k; \ |
96 | } \ |
97 | \ |
98 | /* --- @pre_ecbinit@ --- * \ |
99 | * \ |
100 | * Arguments: @pre_ecbctx *ctx@ = pointer to cipher context \ |
101 | * @const void *key@ = pointer to the key buffer \ |
102 | * @size_t sz@ = size of the key \ |
103 | * @const void *iv@ = pointer to initialization vector \ |
104 | * \ |
105 | * Returns: --- \ |
106 | * \ |
107 | * Use: Initializes an ECB context ready for use. This is \ |
108 | * equivalent to calls to @pre_init@ and @pre_setkey@. \ |
109 | */ \ |
110 | \ |
111 | void pre##_ecbinit(pre##_ecbctx *ctx, \ |
112 | const void *key, size_t sz, \ |
113 | const void *iv) \ |
114 | { \ |
115 | pre##_init(&ctx->ctx, key, sz); \ |
116 | } \ |
117 | \ |
118 | /* --- @pre_ecbencrypt@ --- * \ |
119 | * \ |
120 | * Arguments: @pre_ecbctx *ctx@ = pointer to ECB context block \ |
121 | * @const void *src@ = pointer to source data \ |
122 | * @void *dest@ = pointer to destination data \ |
123 | * @size_t sz@ = size of block to be encrypted \ |
124 | * \ |
125 | * Returns: --- \ |
126 | * \ |
127 | * Use: Encrypts a block with a block cipher in ECB mode, with \ |
128 | * ciphertext stealing and other clever tricks. \ |
129 | * Essentially, data can be encrypted in arbitrary sized \ |
130 | * chunks, although decryption must use the same chunks. \ |
131 | */ \ |
132 | \ |
133 | void pre##_ecbencrypt(pre##_ecbctx *ctx, \ |
134 | const void *src, void *dest, \ |
135 | size_t sz) \ |
136 | { \ |
137 | const octet *s = src; \ |
138 | octet *d = dest; \ |
139 | \ |
140 | /* --- Empty blocks are trivial --- */ \ |
141 | \ |
142 | if (!sz) \ |
143 | return; \ |
144 | \ |
145 | /* --- Short blocks aren't allowed in ECB --- * \ |
146 | * \ |
147 | * There's absolutely nothing secure I can do with them. \ |
148 | */ \ |
149 | \ |
150 | assert(((void)"ECB must have at least one whole block to work with", \ |
151 | sz >= PRE##_BLKSZ)); \ |
152 | \ |
153 | /* --- Do the main chunk of encryption --- * \ |
154 | * \ |
155 | * This will do the whole lot if it's a whole number of blocks. Just \ |
156 | * give each block to the cipher in turn. This is trivial. \ |
157 | * Hopefully... \ |
158 | */ \ |
159 | \ |
160 | while (sz >= 2 * PRE##_BLKSZ || sz == PRE##_BLKSZ) { \ |
161 | uint32 x[PRE##_BLKSZ / 4]; \ |
162 | BLKC_LOAD(PRE, x, s); \ |
163 | pre##_eblk(&ctx->ctx, x, x); \ |
164 | BLKC_STORE(PRE, d, x); \ |
165 | s += PRE##_BLKSZ; \ |
166 | d += PRE##_BLKSZ; \ |
167 | sz -= PRE##_BLKSZ; \ |
168 | } \ |
169 | \ |
170 | /* --- Do the tail-end block and bit-left-over --- * \ |
171 | * \ |
172 | * This isn't very efficient. That shouldn't matter much. \ |
173 | */ \ |
174 | \ |
175 | if (sz) { \ |
176 | uint32 x[PRE##_BLKSZ / 4]; \ |
177 | octet b[PRE##_BLKSZ]; \ |
178 | unsigned i; \ |
179 | \ |
180 | /* --- Let @sz@ be the size of the partial block --- */ \ |
181 | \ |
182 | sz -= PRE##_BLKSZ; \ |
183 | \ |
184 | /* --- First stage --- * \ |
185 | * \ |
186 | * Read in the current block, and encrypt it. The first part of \ |
187 | * the result is the partial ciphertext block. Don't write that \ |
188 | * out yet, because I've not read the partial plaintext block. \ |
189 | */ \ |
190 | \ |
191 | BLKC_LOAD(PRE, x, s); \ |
192 | pre##_eblk(&ctx->ctx, x, x); \ |
193 | BLKC_STORE(PRE, b, x); \ |
194 | \ |
195 | /* --- Second stage --- * \ |
196 | * \ |
197 | * Now move in the partial plaintext block, writing out the \ |
198 | * ciphertext as I go. Then encrypt, and write the complete \ |
199 | * ciphertext block. \ |
200 | */ \ |
201 | \ |
202 | s += PRE##_BLKSZ; \ |
203 | d += PRE##_BLKSZ; \ |
204 | for (i = 0; i < sz; i++) { \ |
205 | register octet y = b[i]; \ |
206 | b[i] = s[i]; \ |
207 | d[i] = y; \ |
208 | } \ |
209 | BLKC_LOAD(PRE, x, b); \ |
210 | pre##_eblk(&ctx->ctx, x, x); \ |
211 | BLKC_STORE(PRE, d - PRE##_BLKSZ, x); \ |
212 | } \ |
213 | \ |
214 | /* --- Done --- */ \ |
215 | \ |
216 | return; \ |
217 | } \ |
218 | \ |
219 | /* --- @pre_ecbdecrypt@ --- * \ |
220 | * \ |
221 | * Arguments: @pre_ecbctx *ctx@ = pointer to ECB context block \ |
222 | * @const void *src@ = pointer to source data \ |
223 | * @void *dest@ = pointer to destination data \ |
224 | * @size_t sz@ = size of block to be encrypted \ |
225 | * \ |
226 | * Returns: --- \ |
227 | * \ |
228 | * Use: Decrypts a block with a block cipher in ECB mode, with \ |
229 | * ciphertext stealing and other clever tricks. \ |
230 | * Essentially, data can be encrypted in arbitrary sized \ |
231 | * chunks, although decryption must use the same chunks. \ |
232 | */ \ |
233 | \ |
234 | void pre##_ecbdecrypt(pre##_ecbctx *ctx, \ |
235 | const void *src, void *dest, \ |
236 | size_t sz) \ |
237 | { \ |
238 | const octet *s = src; \ |
239 | octet *d = dest; \ |
240 | \ |
241 | /* --- Empty blocks are trivial --- */ \ |
242 | \ |
243 | if (!sz) \ |
244 | return; \ |
245 | \ |
246 | /* --- Short blocks aren't allowed in ECB --- * \ |
247 | * \ |
248 | * There's absolutely nothing secure I can do with them. \ |
249 | */ \ |
250 | \ |
251 | assert(((void)"ECB must have at least one whole block to work with", \ |
252 | sz >= PRE##_BLKSZ)); \ |
253 | \ |
254 | /* --- Do the main chunk of decryption --- * \ |
255 | * \ |
256 | * This will do the whole lot if it's a whole number of blocks. \ |
257 | * Each block is just handed to the block cipher in turn. \ |
258 | */ \ |
259 | \ |
260 | while (sz >= 2 * PRE##_BLKSZ || sz == PRE##_BLKSZ) { \ |
261 | uint32 x[PRE##_BLKSZ / 4]; \ |
262 | BLKC_LOAD(PRE, x, s); \ |
263 | pre##_dblk(&ctx->ctx, x, x); \ |
264 | BLKC_STORE(PRE, d, x); \ |
265 | s += PRE##_BLKSZ; \ |
266 | d += PRE##_BLKSZ; \ |
267 | sz -= PRE##_BLKSZ; \ |
268 | } \ |
269 | \ |
270 | /* --- Do the tail-end block and bit-left-over --- * \ |
271 | * \ |
272 | * This isn't very efficient. That shouldn't matter much. \ |
273 | */ \ |
274 | \ |
275 | if (sz) { \ |
276 | uint32 x[PRE##_BLKSZ / 4]; \ |
277 | octet b[PRE##_BLKSZ]; \ |
278 | unsigned i; \ |
279 | \ |
280 | /* --- Let @sz@ be the size of the partial block --- */ \ |
281 | \ |
282 | sz -= PRE##_BLKSZ; \ |
283 | \ |
284 | /* --- First stage --- * \ |
285 | * \ |
286 | * Take the complete ciphertext block, and decrypt it. This block \ |
287 | * is carried over for the next encryption operation. \ |
288 | */ \ |
289 | \ |
290 | BLKC_LOAD(PRE, x, s); \ |
291 | pre##_dblk(&ctx->ctx, x, x); \ |
292 | BLKC_STORE(PRE, b, x); \ |
293 | \ |
294 | /* --- Second stage --- * \ |
295 | * \ |
296 | * The first few bytes are the partial plaintext block. Write that \ |
297 | * and replace with the partial ciphertext block. Then decrypt \ |
298 | * what's left as the complete plaintext. \ |
299 | */ \ |
300 | \ |
301 | s += PRE##_BLKSZ; \ |
302 | d += PRE##_BLKSZ; \ |
303 | for (i = 0; i < sz; i++) { \ |
304 | register octet y = s[i]; \ |
305 | d[i] = b[i]; \ |
306 | b[i] = y; \ |
307 | } \ |
308 | BLKC_LOAD(PRE, x, b); \ |
309 | pre##_dblk(&ctx->ctx, x, x); \ |
310 | BLKC_STORE(PRE, d - PRE##_BLKSZ, x); \ |
311 | } \ |
312 | \ |
313 | /* --- Done --- */ \ |
314 | \ |
315 | return; \ |
316 | } \ |
317 | \ |
318 | /* --- Generic cipher interface --- */ \ |
319 | \ |
320 | static const gcipher_ops gops; \ |
321 | \ |
322 | typedef struct gctx { \ |
323 | gcipher c; \ |
324 | pre##_ecbctx k; \ |
325 | } gctx; \ |
326 | \ |
327 | static gcipher *ginit(const void *k, size_t sz) \ |
328 | { \ |
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329 | gctx *g = S_CREATE(gctx); \ |
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330 | g->c.ops = &gops; \ |
331 | pre##_ecbinit(&g->k, k, sz, 0); \ |
332 | return (&g->c); \ |
333 | } \ |
334 | \ |
335 | static void gencrypt(gcipher *c, const void *s, void *t, size_t sz) \ |
336 | { \ |
337 | gctx *g = (gctx *)c; \ |
338 | pre##_ecbencrypt(&g->k, s, t, sz); \ |
339 | } \ |
340 | \ |
341 | static void gdecrypt(gcipher *c, const void *s, void *t, size_t sz) \ |
342 | { \ |
343 | gctx *g = (gctx *)c; \ |
344 | pre##_ecbdecrypt(&g->k, s, t, sz); \ |
345 | } \ |
346 | \ |
347 | static void gdestroy(gcipher *c) \ |
348 | { \ |
349 | gctx *g = (gctx *)c; \ |
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350 | BURN(*g); \ |
351 | S_DESTROY(g); \ |
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352 | } \ |
353 | \ |
354 | static const gcipher_ops gops = { \ |
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355 | &pre##_ecb, \ |
356 | gencrypt, gdecrypt, gdestroy, 0, 0 \ |
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357 | }; \ |
358 | \ |
359 | const gccipher pre##_ecb = { \ |
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360 | #pre "-ecb", pre##_keysz, PRE##_BLKSZ, \ |
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361 | ginit \ |
362 | }; \ |
363 | \ |
364 | ECB_TEST(PRE, pre) |
365 | |
366 | /*----- Test rig ----------------------------------------------------------*/ |
367 | |
368 | #ifdef TEST_RIG |
369 | |
370 | #include <stdio.h> |
371 | |
372 | #include "daftstory.h" |
373 | |
374 | /* --- @ECB_TEST@ --- * |
375 | * |
376 | * Arguments: @PRE@, @pre@ = prefixes for block cipher definitions |
377 | * |
378 | * Use: Standard test rig for ECB functions. |
379 | */ |
380 | |
381 | #define ECB_TEST(PRE, pre) \ |
382 | \ |
383 | /* --- Initial plaintext for the test --- */ \ |
384 | \ |
385 | static const octet text[] = TEXT; \ |
386 | \ |
387 | /* --- Key and IV to use --- */ \ |
388 | \ |
389 | static const octet key[] = KEY; \ |
390 | static const octet iv[] = IV; \ |
391 | \ |
392 | /* --- Buffers for encryption and decryption output --- */ \ |
393 | \ |
394 | static octet ct[sizeof(text)]; \ |
395 | static octet pt[sizeof(text)]; \ |
396 | \ |
397 | static void hexdump(const octet *p, size_t sz) \ |
398 | { \ |
399 | const octet *q = p + sz; \ |
400 | for (sz = 0; p < q; p++, sz++) { \ |
401 | printf("%02x", *p); \ |
402 | if ((sz + 1) % PRE##_BLKSZ == 0) \ |
403 | putchar(':'); \ |
404 | } \ |
405 | } \ |
406 | \ |
407 | int main(void) \ |
408 | { \ |
409 | size_t sz = 0, rest; \ |
410 | pre##_ecbctx ctx; \ |
411 | int status = 0; \ |
412 | int done = 0; \ |
413 | \ |
414 | size_t keysz = PRE##_KEYSZ ? \ |
415 | PRE##_KEYSZ : strlen((const char *)key); \ |
416 | \ |
417 | fputs(#pre "-ecb: ", stdout); \ |
418 | \ |
419 | pre##_ecbinit(&ctx, key, keysz, iv); \ |
420 | \ |
421 | while (sz <= sizeof(text)) { \ |
422 | rest = sizeof(text) - sz; \ |
423 | if ((sz != 0 && sz < PRE##_BLKSZ) || \ |
424 | (rest != 0 && rest < PRE##_BLKSZ)) \ |
425 | goto next; \ |
426 | memcpy(ct, text, sizeof(text)); \ |
427 | pre##_ecbencrypt(&ctx, ct, ct, sz); \ |
428 | pre##_ecbencrypt(&ctx, ct + sz, ct + sz, rest); \ |
429 | memcpy(pt, ct, sizeof(text)); \ |
430 | pre##_ecbdecrypt(&ctx, pt, pt, sz); \ |
431 | pre##_ecbdecrypt(&ctx, pt + sz, pt + sz, rest); \ |
432 | if (memcmp(pt, text, sizeof(text)) == 0) { \ |
433 | done++; \ |
434 | if (sizeof(text) < 40 || done % 8 == 0) \ |
435 | fputc('.', stdout); \ |
436 | if (done % 480 == 0) \ |
437 | fputs("\n\t", stdout); \ |
438 | fflush(stdout); \ |
439 | } else { \ |
440 | printf("\nError (sz = %lu)\n", (unsigned long)sz); \ |
441 | status = 1; \ |
442 | printf("\tplaintext = "); hexdump(text, sz); \ |
443 | printf(", "); hexdump(text + sz, rest); \ |
444 | fputc('\n', stdout); \ |
445 | printf("\tciphertext = "); hexdump(ct, sz); \ |
446 | printf(", "); hexdump(ct + sz, rest); \ |
447 | fputc('\n', stdout); \ |
448 | printf("\trecovered text = "); hexdump(pt, sz); \ |
449 | printf(", "); hexdump(pt + sz, rest); \ |
450 | fputc('\n', stdout); \ |
451 | fputc('\n', stdout); \ |
452 | } \ |
453 | next: \ |
454 | if (sz < 63) \ |
455 | sz++; \ |
456 | else \ |
457 | sz += 9; \ |
458 | } \ |
459 | \ |
460 | fputs(status ? " failed\n" : " ok\n", stdout); \ |
461 | return (status); \ |
462 | } |
463 | |
464 | #else |
465 | # define ECB_TEST(PRE, pre) |
466 | #endif |
467 | |
468 | /*----- That's all, folks -------------------------------------------------*/ |
469 | |
470 | #ifdef __cplusplus |
471 | } |
472 | #endif |
473 | |
474 | #endif |