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fea9a197 | 1 | /* -*-c-*- |
fea9a197 | 2 | * |
3 | * Definitions for the MGF-1 mask generator | |
4 | * | |
5 | * (c) 2000 Straylight/Edgeware | |
6 | */ | |
7 | ||
45c0fd36 | 8 | /*----- Licensing notice --------------------------------------------------* |
fea9a197 | 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 | * |
fea9a197 | 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 | * |
fea9a197 | 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 | ||
fea9a197 | 28 | #ifndef CATACOMB_MGF_DEF_H |
29 | #define CATACOMB_MGF_DEF_H | |
30 | ||
31 | #ifdef __cplusplus | |
32 | extern "C" { | |
33 | #endif | |
34 | ||
35 | /*----- Header files ------------------------------------------------------*/ | |
36 | ||
37 | #include <stdarg.h> | |
38 | #include <stdlib.h> | |
39 | #include <string.h> | |
40 | ||
41 | #include <mLib/bits.h> | |
42 | #include <mLib/sub.h> | |
43 | ||
44 | #ifndef CATACOMB_ARENA_H | |
45 | # include "arena.h" | |
46 | #endif | |
47 | ||
48 | #ifndef CATACOMB_GCIPHER_H | |
49 | # include "gcipher.h" | |
50 | #endif | |
51 | ||
52 | #ifndef CATACOMB_GRAND_H | |
53 | # include "grand.h" | |
54 | #endif | |
55 | ||
56 | #ifndef CATACOMB_PARANOIA_H | |
57 | # include "paranoia.h" | |
58 | #endif | |
59 | ||
60 | /*----- Macros ------------------------------------------------------------*/ | |
61 | ||
62 | #define MGF_DEF(PRE, pre) \ | |
63 | \ | |
64 | /* --- Useful constants --- */ \ | |
65 | \ | |
66 | const octet pre##_mgfkeysz[] = { KSZ_ANY, PRE##_HASHSZ }; \ | |
67 | \ | |
68 | /* --- @pre_mgfkeybegin@, @pre_mgfkeyadd@ --- * \ | |
69 | * \ | |
70 | * Arguments: @pre_mgfctx *k@ = pointer to context to initialize \ | |
71 | * @const void *p@ = pointer to data to contribute \ | |
72 | * \ | |
73 | * Returns: --- \ | |
74 | * \ | |
75 | * Use: A multi-step keying procedure for initializing an MGF \ | |
76 | * context. The data is contributed to a hashing context \ | |
77 | * which is then used for mask generation. If you only \ | |
78 | * have a fixed buffer, you can save a lot of effort by \ | |
79 | * simply calling @pre_mgfinit@. \ | |
80 | */ \ | |
81 | \ | |
82 | void pre##_mgfkeybegin(pre##_mgfctx *k) \ | |
83 | { \ | |
84 | k->c = 0; \ | |
85 | k->bsz = 0; \ | |
86 | pre##_init(&k->k); \ | |
87 | } \ | |
45c0fd36 | 88 | \ |
fea9a197 | 89 | void pre##_mgfkeyadd(pre##_mgfctx *k, const void *p, size_t sz) \ |
90 | { \ | |
91 | pre##_hash(&k->k, p, sz); \ | |
92 | } \ | |
93 | \ | |
94 | /* ---- @pre_mgfinit@ --- * \ | |
95 | * \ | |
96 | * Arguments: @pre_mgfctx *k@ = pointer to context to initialize \ | |
97 | * @const void *p@ = pointer to data to contribute \ | |
98 | * @size_t sz@ = size of data to contribute \ | |
99 | * \ | |
100 | * Returns: --- \ | |
101 | * \ | |
102 | * Use: A simpler interface to initialization if all of your \ | |
103 | * keying material is in one place. \ | |
104 | */ \ | |
105 | \ | |
106 | void pre##_mgfinit(pre##_mgfctx *k, const void *p, size_t sz) \ | |
107 | { \ | |
108 | k->c = 0; \ | |
109 | k->bsz = 0; \ | |
110 | pre##_init(&k->k); \ | |
111 | pre##_hash(&k->k, p, sz); \ | |
112 | } \ | |
113 | \ | |
114 | /* --- @pre_mgfencrypt@ --- * \ | |
115 | * \ | |
116 | * Arguments: @pre_mgfctx *k@ = pointer to masking context \ | |
117 | * @const void *s@ = pointer to source buffer \ | |
118 | * @void *d@ = pointer to destination buffer \ | |
119 | * @size_t sz@ = size of buffers \ | |
120 | * \ | |
121 | * Returns: --- \ | |
122 | * \ | |
123 | * Use: Outputs pseudorandom data, or masks an input buffer. \ | |
124 | * \ | |
125 | * If @s@ is nonzero, the source material is exclusive- \ | |
126 | * orred with the generated mask. If @d@ is zero, the \ | |
127 | * generator is simply spun around for a while, which \ | |
128 | * isn't very useful. \ | |
129 | */ \ | |
130 | \ | |
131 | void pre##_mgfencrypt(pre##_mgfctx *k, const void *s, \ | |
132 | void *d, size_t sz) \ | |
133 | { \ | |
134 | const octet *ss = s; \ | |
135 | octet *dd = d; \ | |
136 | \ | |
137 | /* --- Empty the buffer if there's anything there --- */ \ | |
138 | \ | |
139 | if (k->bsz) { \ | |
140 | const octet *p = k->buf + PRE##_HASHSZ - k->bsz; \ | |
141 | size_t n = sz > k->bsz ? k->bsz : sz; \ | |
142 | sz -= n; \ | |
143 | k->bsz -= n; \ | |
144 | if (dd) { \ | |
145 | if (!ss) { \ | |
45c0fd36 MW |
146 | memcpy(dd, p, n); \ |
147 | dd += n; \ | |
fea9a197 | 148 | } else { \ |
149 | while (n) { \ | |
150 | *dd++ = *ss++ ^ *p++; \ | |
151 | n--; \ | |
152 | } \ | |
153 | } \ | |
154 | } \ | |
155 | } \ | |
156 | \ | |
157 | /* --- While necessary, generate some more mask --- */ \ | |
158 | \ | |
159 | while (sz) { \ | |
160 | pre##_ctx c = k->k; /* Not quick! */ \ | |
161 | size_t n; \ | |
162 | \ | |
163 | STORE32(k->buf, k->c); \ | |
164 | k->c++; \ | |
165 | pre##_hash(&c, k->buf, 4); \ | |
166 | pre##_done(&c, k->buf); \ | |
167 | n = sz > PRE##_HASHSZ ? PRE##_HASHSZ : sz; \ | |
168 | k->bsz = PRE##_HASHSZ - n; \ | |
169 | sz -= n; \ | |
170 | if (dd) { \ | |
171 | const octet *p = k->buf; \ | |
172 | if (!ss) { \ | |
45c0fd36 MW |
173 | memcpy(dd, p, n); \ |
174 | dd += n; \ | |
fea9a197 | 175 | } else { \ |
176 | while (n) { \ | |
177 | *dd++ = *ss++ ^ *p++; \ | |
178 | n--; \ | |
179 | } \ | |
180 | } \ | |
181 | } \ | |
182 | } \ | |
183 | } \ | |
184 | \ | |
185 | /* --- @pre_mgfsetindex@ --- * \ | |
186 | * \ | |
187 | * Arguments: @pre_mgfctx *k@ = pointer to masking context \ | |
188 | * @uint32 *c@ = new index to set \ | |
189 | * \ | |
190 | * Returns: --- \ | |
191 | * \ | |
192 | * Use: Sets a new index. This may be used to step around the \ | |
193 | * output stream in a rather crude way. \ | |
194 | */ \ | |
195 | \ | |
196 | void pre##_mgfsetindex(pre##_mgfctx *k, uint32 c) \ | |
197 | { \ | |
198 | k->c = c; \ | |
199 | k->bsz = 0; \ | |
200 | } \ | |
201 | \ | |
202 | /* --- Generic cipher interface --- */ \ | |
203 | \ | |
204 | static const gcipher_ops gops; \ | |
205 | \ | |
206 | typedef struct gctx { \ | |
207 | gcipher c; \ | |
208 | pre##_mgfctx k; \ | |
209 | } gctx; \ | |
210 | \ | |
211 | static gcipher *ginit(const void *k, size_t sz) \ | |
212 | { \ | |
213 | gctx *g = S_CREATE(gctx); \ | |
214 | g->c.ops = &gops; \ | |
215 | pre##_mgfinit(&g->k, k, sz); \ | |
216 | return (&g->c); \ | |
217 | } \ | |
218 | \ | |
219 | static void gencrypt(gcipher *c, const void *s, void *t, size_t sz) \ | |
220 | { \ | |
221 | gctx *g = (gctx *)c; \ | |
222 | pre##_mgfencrypt(&g->k, s, t, sz); \ | |
223 | } \ | |
224 | \ | |
225 | static void gdestroy(gcipher *c) \ | |
226 | { \ | |
227 | gctx *g = (gctx *)c; \ | |
228 | BURN(*g); \ | |
229 | S_DESTROY(g); \ | |
230 | } \ | |
231 | \ | |
232 | static const gcipher_ops gops = { \ | |
233 | &pre##_mgf, \ | |
234 | gencrypt, gencrypt, gdestroy, 0, 0 \ | |
235 | }; \ | |
236 | \ | |
237 | const gccipher pre##_mgf = { \ | |
238 | #pre "-mgf", pre##_mgfkeysz, 0, \ | |
239 | ginit \ | |
240 | }; \ | |
241 | \ | |
242 | /* --- Generic random number generator interface --- */ \ | |
243 | \ | |
244 | typedef struct grctx { \ | |
245 | grand r; \ | |
246 | pre##_mgfctx k; \ | |
247 | } grctx; \ | |
248 | \ | |
249 | static void grdestroy(grand *r) \ | |
250 | { \ | |
251 | grctx *g = (grctx *)r; \ | |
252 | BURN(*g); \ | |
253 | S_DESTROY(g); \ | |
254 | } \ | |
255 | \ | |
256 | static int grmisc(grand *r, unsigned op, ...) \ | |
257 | { \ | |
258 | grctx *g = (grctx *)r; \ | |
259 | va_list ap; \ | |
260 | int rc = 0; \ | |
261 | va_start(ap, op); \ | |
262 | \ | |
263 | switch (op) { \ | |
264 | case GRAND_CHECK: \ | |
265 | switch (va_arg(ap, unsigned)) { \ | |
266 | case GRAND_CHECK: \ | |
267 | case GRAND_SEEDINT: \ | |
268 | case GRAND_SEEDUINT32: \ | |
269 | case GRAND_SEEDBLOCK: \ | |
270 | case GRAND_SEEDRAND: \ | |
271 | rc = 1; \ | |
272 | break; \ | |
273 | default: \ | |
274 | rc = 0; \ | |
275 | break; \ | |
276 | } \ | |
277 | break; \ | |
278 | case GRAND_SEEDINT: \ | |
279 | pre##_mgfsetindex(&g->k, va_arg(ap, unsigned)); \ | |
280 | break; \ | |
281 | case GRAND_SEEDUINT32: \ | |
282 | pre##_mgfsetindex(&g->k, va_arg(ap, uint32)); \ | |
283 | break; \ | |
284 | case GRAND_SEEDBLOCK: { \ | |
285 | const void *p = va_arg(ap, const void *); \ | |
286 | size_t sz = va_arg(ap, size_t); \ | |
287 | pre##_hash(&g->k.k, p, sz); \ | |
288 | } break; \ | |
289 | case GRAND_SEEDRAND: { \ | |
290 | octet buf[PRE##_BUFSZ]; \ | |
291 | grand *rr = va_arg(ap, grand *); \ | |
292 | rr->ops->fill(rr, buf, sizeof(buf)); \ | |
293 | pre##_hash(&g->k.k, buf, sizeof(buf)); \ | |
294 | } break; \ | |
295 | default: \ | |
296 | GRAND_BADOP; \ | |
297 | break; \ | |
298 | } \ | |
299 | \ | |
300 | va_end(ap); \ | |
301 | return (rc); \ | |
302 | } \ | |
303 | \ | |
304 | static octet grbyte(grand *r) \ | |
305 | { \ | |
306 | grctx *g = (grctx *)r; \ | |
307 | octet o; \ | |
308 | pre##_mgfencrypt(&g->k, 0, &o, 1); \ | |
309 | return (o); \ | |
310 | } \ | |
311 | \ | |
312 | static uint32 grword(grand *r) \ | |
313 | { \ | |
314 | grctx *g = (grctx *)r; \ | |
315 | octet b[4]; \ | |
316 | pre##_mgfencrypt(&g->k, 0, b, sizeof(b)); \ | |
317 | return (LOAD32(b)); \ | |
318 | } \ | |
319 | \ | |
320 | static void grfill(grand *r, void *p, size_t sz) \ | |
321 | { \ | |
322 | grctx *g = (grctx *)r; \ | |
323 | pre##_mgfencrypt(&g->k, 0, p, sz); \ | |
324 | } \ | |
325 | \ | |
326 | static const grand_ops grops = { \ | |
327 | #pre "-mgf", \ | |
328 | GRAND_CRYPTO, 0, \ | |
329 | grmisc, grdestroy, \ | |
44ff6c11 | 330 | grword, grbyte, grword, grand_defaultrange, grfill \ |
fea9a197 | 331 | }; \ |
332 | \ | |
333 | /* --- @pre_mgfrand@ --- * \ | |
334 | * \ | |
335 | * Arguments: @const void *k@ = pointer to key material \ | |
336 | * @size_t sz@ = size of key material \ | |
337 | * \ | |
338 | * Returns: Pointer to a generic random number generator instance. \ | |
339 | * \ | |
340 | * Use: Creates a random number interface wrapper around an \ | |
341 | * MGF-1-mode hash function. \ | |
342 | */ \ | |
343 | \ | |
344 | extern grand *pre##_mgfrand(const void *k, size_t sz) \ | |
345 | { \ | |
346 | grctx *g = S_CREATE(grctx); \ | |
347 | g->r.ops = &grops; \ | |
348 | pre##_mgfinit(&g->k, k, sz); \ | |
349 | return (&g->r); \ | |
350 | } \ | |
351 | \ | |
352 | MGF_TEST(PRE, pre) | |
353 | ||
354 | /*----- Test rig ----------------------------------------------------------*/ | |
355 | ||
356 | #ifdef TEST_RIG | |
357 | ||
358 | #include <stdio.h> | |
359 | ||
360 | #include "daftstory.h" | |
361 | ||
362 | /* --- @MGF_TEST@ --- * | |
363 | * | |
364 | * Arguments: @PRE@, @pre@ = prefixes for block cipher definitions | |
365 | * | |
366 | * Use: Standard test rig for MGF functions. | |
367 | */ | |
368 | ||
369 | #define MGF_TEST(PRE, pre) \ | |
370 | \ | |
371 | /* --- Initial plaintext for the test --- */ \ | |
372 | \ | |
373 | static const octet text[] = TEXT; \ | |
374 | \ | |
375 | /* --- Key and IV to use --- */ \ | |
376 | \ | |
377 | static const octet key[] = KEY; \ | |
378 | \ | |
379 | /* --- Buffers for encryption and decryption output --- */ \ | |
380 | \ | |
381 | static octet ct[sizeof(text)]; \ | |
382 | static octet pt[sizeof(text)]; \ | |
383 | \ | |
384 | static void hexdump(const octet *p, size_t sz) \ | |
385 | { \ | |
386 | const octet *q = p + sz; \ | |
387 | for (sz = 0; p < q; p++, sz++) { \ | |
388 | printf("%02x", *p); \ | |
389 | if ((sz + 1) % PRE##_HASHSZ == 0) \ | |
390 | putchar(':'); \ | |
391 | } \ | |
392 | } \ | |
393 | \ | |
394 | int main(void) \ | |
395 | { \ | |
396 | size_t sz = 0, rest; \ | |
397 | pre##_mgfctx ctx; \ | |
398 | int status = 0; \ | |
399 | int done = 0; \ | |
400 | \ | |
401 | size_t keysz = strlen((const char *)key); \ | |
402 | \ | |
403 | fputs(#pre "-mgf: ", stdout); \ | |
404 | \ | |
405 | pre##_mgfinit(&ctx, key, keysz); \ | |
406 | \ | |
407 | while (sz <= sizeof(text)) { \ | |
408 | rest = sizeof(text) - sz; \ | |
409 | memcpy(ct, text, sizeof(text)); \ | |
410 | pre##_mgfsetindex(&ctx, 0); \ | |
411 | pre##_mgfencrypt(&ctx, ct, ct, sz); \ | |
412 | pre##_mgfencrypt(&ctx, ct + sz, ct + sz, rest); \ | |
413 | memcpy(pt, ct, sizeof(text)); \ | |
414 | pre##_mgfsetindex(&ctx, 0); \ | |
415 | pre##_mgfencrypt(&ctx, pt, pt, rest); \ | |
416 | pre##_mgfencrypt(&ctx, pt + rest, pt + rest, sz); \ | |
417 | if (memcmp(pt, text, sizeof(text)) == 0) { \ | |
418 | done++; \ | |
419 | if (sizeof(text) < 40 || done % 8 == 0) \ | |
45c0fd36 | 420 | fputc('.', stdout); \ |
fea9a197 | 421 | if (done % 480 == 0) \ |
45c0fd36 | 422 | fputs("\n\t", stdout); \ |
fea9a197 | 423 | fflush(stdout); \ |
424 | } else { \ | |
425 | printf("\nError (sz = %lu)\n", (unsigned long)sz); \ | |
426 | status = 1; \ | |
427 | printf("\tplaintext = "); hexdump(text, sz); \ | |
45c0fd36 MW |
428 | printf(", "); hexdump(text + sz, rest); \ |
429 | fputc('\n', stdout); \ | |
fea9a197 | 430 | printf("\tciphertext = "); hexdump(ct, sz); \ |
45c0fd36 MW |
431 | printf(", "); hexdump(ct + sz, rest); \ |
432 | fputc('\n', stdout); \ | |
fea9a197 | 433 | printf("\trecovered text = "); hexdump(pt, sz); \ |
45c0fd36 MW |
434 | printf(", "); hexdump(pt + sz, rest); \ |
435 | fputc('\n', stdout); \ | |
fea9a197 | 436 | fputc('\n', stdout); \ |
437 | } \ | |
438 | if (sz < 63) \ | |
439 | sz++; \ | |
440 | else \ | |
441 | sz += 9; \ | |
442 | } \ | |
443 | \ | |
444 | fputs(status ? " failed\n" : " ok\n", stdout); \ | |
445 | return (status); \ | |
446 | } | |
447 | ||
448 | #else | |
449 | # define MGF_TEST(PRE, pre) | |
450 | #endif | |
451 | ||
452 | /*----- That's all, folks -------------------------------------------------*/ | |
453 | ||
454 | #ifdef __cplusplus | |
455 | } | |
456 | #endif | |
457 | ||
458 | #endif |