Commit | Line | Data |
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79ba130c | 1 | /* -*-c-*- |
2 | * | |
79ba130c | 3 | * Definitions electronic code book mode |
4 | * | |
5 | * (c) 1999 Straylight/Edgeware | |
6 | */ | |
7 | ||
45c0fd36 | 8 | /*----- Licensing notice --------------------------------------------------* |
79ba130c | 9 | * |
10 | * This file is part of Catacomb. | |
11 | * | |
12 | * Catacomb is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU Library General Public License as | |
14 | * published by the Free Software Foundation; either version 2 of the | |
15 | * License, or (at your option) any later version. | |
45c0fd36 | 16 | * |
79ba130c | 17 | * Catacomb is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU Library General Public License for more details. | |
45c0fd36 | 21 | * |
79ba130c | 22 | * You should have received a copy of the GNU Library General Public |
23 | * License along with Catacomb; if not, write to the Free | |
24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, | |
25 | * MA 02111-1307, USA. | |
26 | */ | |
27 | ||
79ba130c | 28 | #ifndef CATACOMB_ECB_DEF_H |
29 | #define CATACOMB_ECB_DEF_H | |
30 | ||
31 | #ifdef __cplusplus | |
32 | extern "C" { | |
33 | #endif | |
34 | ||
35 | /*----- Header files ------------------------------------------------------*/ | |
36 | ||
37 | #include <assert.h> | |
38 | #include <string.h> | |
39 | ||
40 | #include <mLib/bits.h> | |
41 | #include <mLib/sub.h> | |
42 | ||
99461409 | 43 | #ifndef CATACOMB_ARENA_H |
44 | # include "arena.h" | |
45 | #endif | |
46 | ||
79ba130c | 47 | #ifndef CATACOMB_BLKC_H |
48 | # include "blkc.h" | |
49 | #endif | |
50 | ||
51 | #ifndef CATACOMB_GCIPHER_H | |
52 | # include "gcipher.h" | |
53 | #endif | |
54 | ||
99461409 | 55 | #ifndef CATACOMB_PARANOIA_H |
56 | # include "paranoia.h" | |
57 | #endif | |
58 | ||
79ba130c | 59 | /*----- Macros ------------------------------------------------------------*/ |
60 | ||
61 | /* --- @ECB_DEF@ --- * | |
62 | * | |
63 | * Arguments: @PRE@, @pre@ = prefixes for the underlying block cipher | |
64 | * | |
65 | * Use: Creates an implementation for ECB stealing mode. | |
66 | */ | |
67 | ||
aaae9cab MW |
68 | #define ECB_DEF(PRE, pre) ECB_DEFX(PRE, pre, #pre, #pre) |
69 | ||
70 | #define ECB_DEFX(PRE, pre, name, fname) \ | |
79ba130c | 71 | \ |
72 | /* --- @pre_ecbsetkey@ --- * \ | |
73 | * \ | |
74 | * Arguments: @pre_ecbctx *ctx@ = pointer to ECB context block \ | |
75 | * @const pre_ctx *k@ = pointer to cipher context \ | |
76 | * \ | |
77 | * Returns: --- \ | |
78 | * \ | |
79 | * Use: Sets the ECB context to use a different cipher key. \ | |
80 | */ \ | |
81 | \ | |
82 | void pre##_ecbsetkey(pre##_ecbctx *ctx, const pre##_ctx *k) \ | |
83 | { \ | |
84 | ctx->ctx = *k; \ | |
85 | } \ | |
86 | \ | |
87 | /* --- @pre_ecbinit@ --- * \ | |
88 | * \ | |
89 | * Arguments: @pre_ecbctx *ctx@ = pointer to cipher context \ | |
90 | * @const void *key@ = pointer to the key buffer \ | |
91 | * @size_t sz@ = size of the key \ | |
92 | * @const void *iv@ = pointer to initialization vector \ | |
93 | * \ | |
94 | * Returns: --- \ | |
95 | * \ | |
96 | * Use: Initializes an ECB context ready for use. This is \ | |
97 | * equivalent to calls to @pre_init@ and @pre_setkey@. \ | |
98 | */ \ | |
99 | \ | |
100 | void pre##_ecbinit(pre##_ecbctx *ctx, \ | |
101 | const void *key, size_t sz, \ | |
102 | const void *iv) \ | |
103 | { \ | |
104 | pre##_init(&ctx->ctx, key, sz); \ | |
105 | } \ | |
106 | \ | |
107 | /* --- @pre_ecbencrypt@ --- * \ | |
108 | * \ | |
109 | * Arguments: @pre_ecbctx *ctx@ = pointer to ECB context block \ | |
110 | * @const void *src@ = pointer to source data \ | |
111 | * @void *dest@ = pointer to destination data \ | |
112 | * @size_t sz@ = size of block to be encrypted \ | |
113 | * \ | |
114 | * Returns: --- \ | |
115 | * \ | |
116 | * Use: Encrypts a block with a block cipher in ECB mode, with \ | |
117 | * ciphertext stealing and other clever tricks. \ | |
118 | * Essentially, data can be encrypted in arbitrary sized \ | |
119 | * chunks, although decryption must use the same chunks. \ | |
120 | */ \ | |
121 | \ | |
122 | void pre##_ecbencrypt(pre##_ecbctx *ctx, \ | |
123 | const void *src, void *dest, \ | |
124 | size_t sz) \ | |
125 | { \ | |
126 | const octet *s = src; \ | |
127 | octet *d = dest; \ | |
128 | \ | |
129 | /* --- Empty blocks are trivial --- */ \ | |
130 | \ | |
131 | if (!sz) \ | |
132 | return; \ | |
133 | \ | |
134 | /* --- Short blocks aren't allowed in ECB --- * \ | |
135 | * \ | |
136 | * There's absolutely nothing secure I can do with them. \ | |
137 | */ \ | |
138 | \ | |
139 | assert(((void)"ECB must have at least one whole block to work with", \ | |
140 | sz >= PRE##_BLKSZ)); \ | |
141 | \ | |
142 | /* --- Do the main chunk of encryption --- * \ | |
143 | * \ | |
144 | * This will do the whole lot if it's a whole number of blocks. Just \ | |
145 | * give each block to the cipher in turn. This is trivial. \ | |
146 | * Hopefully... \ | |
147 | */ \ | |
148 | \ | |
149 | while (sz >= 2 * PRE##_BLKSZ || sz == PRE##_BLKSZ) { \ | |
150 | uint32 x[PRE##_BLKSZ / 4]; \ | |
5c3f75ec | 151 | if (!s) \ |
152 | BLKC_ZERO(PRE, x); \ | |
153 | else { \ | |
154 | BLKC_LOAD(PRE, x, s); \ | |
155 | s += PRE##_BLKSZ; \ | |
156 | } \ | |
79ba130c | 157 | pre##_eblk(&ctx->ctx, x, x); \ |
5c3f75ec | 158 | if (d) { \ |
159 | BLKC_STORE(PRE, d, x); \ | |
160 | d += PRE##_BLKSZ; \ | |
161 | } \ | |
79ba130c | 162 | sz -= PRE##_BLKSZ; \ |
163 | } \ | |
164 | \ | |
165 | /* --- Do the tail-end block and bit-left-over --- * \ | |
166 | * \ | |
167 | * This isn't very efficient. That shouldn't matter much. \ | |
168 | */ \ | |
169 | \ | |
170 | if (sz) { \ | |
171 | uint32 x[PRE##_BLKSZ / 4]; \ | |
172 | octet b[PRE##_BLKSZ]; \ | |
173 | unsigned i; \ | |
174 | \ | |
175 | /* --- Let @sz@ be the size of the partial block --- */ \ | |
176 | \ | |
177 | sz -= PRE##_BLKSZ; \ | |
178 | \ | |
179 | /* --- First stage --- * \ | |
180 | * \ | |
181 | * Read in the current block, and encrypt it. The first part of \ | |
182 | * the result is the partial ciphertext block. Don't write that \ | |
183 | * out yet, because I've not read the partial plaintext block. \ | |
184 | */ \ | |
185 | \ | |
5c3f75ec | 186 | if (!s) \ |
187 | BLKC_ZERO(PRE, x); \ | |
188 | else { \ | |
189 | BLKC_LOAD(PRE, x, s); \ | |
190 | s += PRE##_BLKSZ; \ | |
191 | } \ | |
79ba130c | 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 | \ | |
5c3f75ec | 202 | if (d) d += PRE##_BLKSZ; \ |
79ba130c | 203 | for (i = 0; i < sz; i++) { \ |
204 | register octet y = b[i]; \ | |
205 | b[i] = s[i]; \ | |
5c3f75ec | 206 | if (d) d[i] = y; \ |
79ba130c | 207 | } \ |
208 | BLKC_LOAD(PRE, x, b); \ | |
209 | pre##_eblk(&ctx->ctx, x, x); \ | |
5c3f75ec | 210 | if (d) BLKC_STORE(PRE, d - PRE##_BLKSZ, x); \ |
79ba130c | 211 | } \ |
212 | \ | |
213 | /* --- Done --- */ \ | |
214 | \ | |
215 | return; \ | |
216 | } \ | |
217 | \ | |
218 | /* --- @pre_ecbdecrypt@ --- * \ | |
219 | * \ | |
220 | * Arguments: @pre_ecbctx *ctx@ = pointer to ECB context block \ | |
221 | * @const void *src@ = pointer to source data \ | |
222 | * @void *dest@ = pointer to destination data \ | |
223 | * @size_t sz@ = size of block to be encrypted \ | |
224 | * \ | |
225 | * Returns: --- \ | |
226 | * \ | |
227 | * Use: Decrypts a block with a block cipher in ECB mode, with \ | |
228 | * ciphertext stealing and other clever tricks. \ | |
229 | * Essentially, data can be encrypted in arbitrary sized \ | |
230 | * chunks, although decryption must use the same chunks. \ | |
231 | */ \ | |
232 | \ | |
233 | void pre##_ecbdecrypt(pre##_ecbctx *ctx, \ | |
234 | const void *src, void *dest, \ | |
235 | size_t sz) \ | |
236 | { \ | |
237 | const octet *s = src; \ | |
238 | octet *d = dest; \ | |
239 | \ | |
240 | /* --- Empty blocks are trivial --- */ \ | |
241 | \ | |
242 | if (!sz) \ | |
243 | return; \ | |
244 | \ | |
245 | /* --- Short blocks aren't allowed in ECB --- * \ | |
246 | * \ | |
247 | * There's absolutely nothing secure I can do with them. \ | |
248 | */ \ | |
249 | \ | |
250 | assert(((void)"ECB must have at least one whole block to work with", \ | |
251 | sz >= PRE##_BLKSZ)); \ | |
252 | \ | |
253 | /* --- Do the main chunk of decryption --- * \ | |
254 | * \ | |
255 | * This will do the whole lot if it's a whole number of blocks. \ | |
256 | * Each block is just handed to the block cipher in turn. \ | |
257 | */ \ | |
258 | \ | |
259 | while (sz >= 2 * PRE##_BLKSZ || sz == PRE##_BLKSZ) { \ | |
260 | uint32 x[PRE##_BLKSZ / 4]; \ | |
261 | BLKC_LOAD(PRE, x, s); \ | |
262 | pre##_dblk(&ctx->ctx, x, x); \ | |
263 | BLKC_STORE(PRE, d, x); \ | |
264 | s += PRE##_BLKSZ; \ | |
265 | d += PRE##_BLKSZ; \ | |
266 | sz -= PRE##_BLKSZ; \ | |
267 | } \ | |
268 | \ | |
269 | /* --- Do the tail-end block and bit-left-over --- * \ | |
270 | * \ | |
271 | * This isn't very efficient. That shouldn't matter much. \ | |
272 | */ \ | |
273 | \ | |
274 | if (sz) { \ | |
275 | uint32 x[PRE##_BLKSZ / 4]; \ | |
276 | octet b[PRE##_BLKSZ]; \ | |
277 | unsigned i; \ | |
278 | \ | |
279 | /* --- Let @sz@ be the size of the partial block --- */ \ | |
280 | \ | |
281 | sz -= PRE##_BLKSZ; \ | |
282 | \ | |
283 | /* --- First stage --- * \ | |
284 | * \ | |
285 | * Take the complete ciphertext block, and decrypt it. This block \ | |
286 | * is carried over for the next encryption operation. \ | |
287 | */ \ | |
288 | \ | |
289 | BLKC_LOAD(PRE, x, s); \ | |
290 | pre##_dblk(&ctx->ctx, x, x); \ | |
291 | BLKC_STORE(PRE, b, x); \ | |
292 | \ | |
293 | /* --- Second stage --- * \ | |
294 | * \ | |
295 | * The first few bytes are the partial plaintext block. Write that \ | |
296 | * and replace with the partial ciphertext block. Then decrypt \ | |
297 | * what's left as the complete plaintext. \ | |
298 | */ \ | |
299 | \ | |
300 | s += PRE##_BLKSZ; \ | |
301 | d += PRE##_BLKSZ; \ | |
302 | for (i = 0; i < sz; i++) { \ | |
303 | register octet y = s[i]; \ | |
304 | d[i] = b[i]; \ | |
305 | b[i] = y; \ | |
306 | } \ | |
307 | BLKC_LOAD(PRE, x, b); \ | |
308 | pre##_dblk(&ctx->ctx, x, x); \ | |
309 | BLKC_STORE(PRE, d - PRE##_BLKSZ, x); \ | |
310 | } \ | |
311 | \ | |
312 | /* --- Done --- */ \ | |
313 | \ | |
314 | return; \ | |
315 | } \ | |
316 | \ | |
317 | /* --- Generic cipher interface --- */ \ | |
318 | \ | |
319 | static const gcipher_ops gops; \ | |
320 | \ | |
321 | typedef struct gctx { \ | |
322 | gcipher c; \ | |
323 | pre##_ecbctx k; \ | |
324 | } gctx; \ | |
325 | \ | |
326 | static gcipher *ginit(const void *k, size_t sz) \ | |
327 | { \ | |
99461409 | 328 | gctx *g = S_CREATE(gctx); \ |
79ba130c | 329 | g->c.ops = &gops; \ |
330 | pre##_ecbinit(&g->k, k, sz, 0); \ | |
331 | return (&g->c); \ | |
332 | } \ | |
333 | \ | |
334 | static void gencrypt(gcipher *c, const void *s, void *t, size_t sz) \ | |
335 | { \ | |
336 | gctx *g = (gctx *)c; \ | |
337 | pre##_ecbencrypt(&g->k, s, t, sz); \ | |
338 | } \ | |
339 | \ | |
340 | static void gdecrypt(gcipher *c, const void *s, void *t, size_t sz) \ | |
341 | { \ | |
342 | gctx *g = (gctx *)c; \ | |
343 | pre##_ecbdecrypt(&g->k, s, t, sz); \ | |
344 | } \ | |
345 | \ | |
346 | static void gdestroy(gcipher *c) \ | |
347 | { \ | |
348 | gctx *g = (gctx *)c; \ | |
99461409 | 349 | BURN(*g); \ |
350 | S_DESTROY(g); \ | |
79ba130c | 351 | } \ |
352 | \ | |
353 | static const gcipher_ops gops = { \ | |
99461409 | 354 | &pre##_ecb, \ |
355 | gencrypt, gdecrypt, gdestroy, 0, 0 \ | |
79ba130c | 356 | }; \ |
357 | \ | |
358 | const gccipher pre##_ecb = { \ | |
aaae9cab | 359 | name "-ecb", pre##_keysz, PRE##_BLKSZ, \ |
79ba130c | 360 | ginit \ |
361 | }; \ | |
362 | \ | |
aaae9cab | 363 | ECB_TESTX(PRE, pre, name, fname) |
79ba130c | 364 | |
365 | /*----- Test rig ----------------------------------------------------------*/ | |
366 | ||
aaae9cab MW |
367 | #define ECB_TEST(PRE, pre) ECB_TESTX(PRE, pre, #pre, #pre) |
368 | ||
79ba130c | 369 | #ifdef TEST_RIG |
370 | ||
371 | #include <stdio.h> | |
372 | ||
373 | #include "daftstory.h" | |
374 | ||
375 | /* --- @ECB_TEST@ --- * | |
376 | * | |
377 | * Arguments: @PRE@, @pre@ = prefixes for block cipher definitions | |
378 | * | |
379 | * Use: Standard test rig for ECB functions. | |
380 | */ | |
381 | ||
aaae9cab | 382 | #define ECB_TESTX(PRE, pre, name, fname) \ |
79ba130c | 383 | \ |
384 | /* --- Initial plaintext for the test --- */ \ | |
385 | \ | |
386 | static const octet text[] = TEXT; \ | |
387 | \ | |
388 | /* --- Key and IV to use --- */ \ | |
389 | \ | |
390 | static const octet key[] = KEY; \ | |
391 | static const octet iv[] = IV; \ | |
392 | \ | |
393 | /* --- Buffers for encryption and decryption output --- */ \ | |
394 | \ | |
395 | static octet ct[sizeof(text)]; \ | |
396 | static octet pt[sizeof(text)]; \ | |
397 | \ | |
12331b2d | 398 | static void hexdump(const octet *p, size_t sz, size_t off) \ |
79ba130c | 399 | { \ |
400 | const octet *q = p + sz; \ | |
401 | for (sz = 0; p < q; p++, sz++) { \ | |
402 | printf("%02x", *p); \ | |
12331b2d | 403 | if ((off + sz + 1) % PRE##_BLKSZ == 0) \ |
79ba130c | 404 | putchar(':'); \ |
405 | } \ | |
406 | } \ | |
407 | \ | |
408 | int main(void) \ | |
409 | { \ | |
410 | size_t sz = 0, rest; \ | |
411 | pre##_ecbctx ctx; \ | |
412 | int status = 0; \ | |
413 | int done = 0; \ | |
414 | \ | |
415 | size_t keysz = PRE##_KEYSZ ? \ | |
416 | PRE##_KEYSZ : strlen((const char *)key); \ | |
417 | \ | |
aaae9cab | 418 | fputs(name "-ecb: ", stdout); \ |
79ba130c | 419 | \ |
420 | pre##_ecbinit(&ctx, key, keysz, iv); \ | |
421 | \ | |
422 | while (sz <= sizeof(text)) { \ | |
423 | rest = sizeof(text) - sz; \ | |
424 | if ((sz != 0 && sz < PRE##_BLKSZ) || \ | |
425 | (rest != 0 && rest < PRE##_BLKSZ)) \ | |
426 | goto next; \ | |
427 | memcpy(ct, text, sizeof(text)); \ | |
428 | pre##_ecbencrypt(&ctx, ct, ct, sz); \ | |
429 | pre##_ecbencrypt(&ctx, ct + sz, ct + sz, rest); \ | |
430 | memcpy(pt, ct, sizeof(text)); \ | |
431 | pre##_ecbdecrypt(&ctx, pt, pt, sz); \ | |
432 | pre##_ecbdecrypt(&ctx, pt + sz, pt + sz, rest); \ | |
433 | if (memcmp(pt, text, sizeof(text)) == 0) { \ | |
434 | done++; \ | |
435 | if (sizeof(text) < 40 || done % 8 == 0) \ | |
45c0fd36 | 436 | fputc('.', stdout); \ |
79ba130c | 437 | if (done % 480 == 0) \ |
45c0fd36 | 438 | fputs("\n\t", stdout); \ |
79ba130c | 439 | fflush(stdout); \ |
440 | } else { \ | |
441 | printf("\nError (sz = %lu)\n", (unsigned long)sz); \ | |
442 | status = 1; \ | |
12331b2d MW |
443 | printf("\tplaintext = "); hexdump(text, sz, 0); \ |
444 | printf(", "); hexdump(text + sz, rest, sz); \ | |
45c0fd36 | 445 | fputc('\n', stdout); \ |
12331b2d MW |
446 | printf("\tciphertext = "); hexdump(ct, sz, 0); \ |
447 | printf(", "); hexdump(ct + sz, rest, sz); \ | |
45c0fd36 | 448 | fputc('\n', stdout); \ |
12331b2d MW |
449 | printf("\trecovered text = "); hexdump(pt, sz, 0); \ |
450 | printf(", "); hexdump(pt + sz, rest, sz); \ | |
45c0fd36 | 451 | fputc('\n', stdout); \ |
79ba130c | 452 | fputc('\n', stdout); \ |
453 | } \ | |
454 | next: \ | |
455 | if (sz < 63) \ | |
456 | sz++; \ | |
457 | else \ | |
458 | sz += 9; \ | |
459 | } \ | |
460 | \ | |
461 | fputs(status ? " failed\n" : " ok\n", stdout); \ | |
462 | return (status); \ | |
463 | } | |
464 | ||
465 | #else | |
aaae9cab | 466 | # define ECB_TESTX(PRE, pre, name, fname) |
79ba130c | 467 | #endif |
468 | ||
469 | /*----- That's all, folks -------------------------------------------------*/ | |
470 | ||
471 | #ifdef __cplusplus | |
472 | } | |
473 | #endif | |
474 | ||
475 | #endif |