Commit | Line | Data |
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d03ab969 | 1 | /* -*-c-*- |
2 | * | |
d03ab969 | 3 | * Secure random number generator |
4 | * | |
5 | * (c) 1998 Straylight/Edgeware | |
6 | */ | |
7 | ||
45c0fd36 | 8 | /*----- Licensing notice --------------------------------------------------* |
d03ab969 | 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 | * |
d03ab969 | 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 | * |
d03ab969 | 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 | ||
d03ab969 | 28 | /*----- Header files ------------------------------------------------------*/ |
29 | ||
f1da6683 MW |
30 | #include "config.h" |
31 | ||
aacbc1c6 | 32 | #include <stdarg.h> |
d03ab969 | 33 | #include <stdio.h> |
34 | #include <string.h> | |
35 | ||
36 | #include <mLib/bits.h> | |
aacbc1c6 | 37 | #include <mLib/sub.h> |
d03ab969 | 38 | |
ac2fd5cd | 39 | #include "arena.h" |
f1da6683 | 40 | #include "dispatch.h" |
d03ab969 | 41 | #include "paranoia.h" |
a7a76ebd MW |
42 | |
43 | #define RAND__HACKS | |
d03ab969 | 44 | #include "rand.h" |
d6fab4f6 MW |
45 | |
46 | #include "noise.h" | |
47 | ||
48 | #include "twofish-counter.h" | |
49 | #include "sha256.h" | |
50 | ||
51 | #define CIPHER_CTX twofish_counterctx | |
52 | #define CIPHER_INIT twofish_counterinit | |
53 | #define CIPHER_ENCRYPT twofish_counterencrypt | |
54 | #define CIPHER_IVSZ TWOFISH_BLKSZ | |
55 | #define CIPHER_KEYSZ TWOFISH_KEYSZ | |
56 | ||
57 | #define HASH_CTX sha256_ctx | |
58 | #define HASH_INIT sha256_init | |
59 | #define HASH sha256_hash | |
60 | #define HASH_DONE sha256_done | |
61 | #define HASH_SZ SHA256_HASHSZ | |
d03ab969 | 62 | |
63 | /*----- Static variables --------------------------------------------------*/ | |
64 | ||
aacbc1c6 | 65 | static const grand_ops gops; |
66 | ||
a7a76ebd | 67 | typedef struct rand__gctx { |
aacbc1c6 | 68 | grand r; |
69 | rand_pool p; | |
70 | } gctx; | |
71 | ||
a7a76ebd MW |
72 | gctx rand_global = { |
73 | { &gops }, | |
53073dfb | 74 | { { 0 }, 0, 0, 0, 0, |
a7a76ebd | 75 | { 0 }, RAND_SECSZ, 0, |
d6fab4f6 MW |
76 | { "Catacomb global random byte pool" }, |
77 | &noise_source } | |
a7a76ebd | 78 | }; |
d03ab969 | 79 | |
80 | /*----- Macros ------------------------------------------------------------*/ | |
81 | ||
a7a76ebd MW |
82 | #define RAND_RESOLVE(r) \ |
83 | do { if ((r) == RAND_GLOBAL) r = &rand_global.p; } while (0) | |
d03ab969 | 84 | |
53073dfb MW |
85 | #define GENCHECK(r) do { \ |
86 | unsigned gen = rand_generation(); \ | |
87 | if (r->gen != gen) { r->gen = gen; rand_gate(r); } \ | |
88 | } while (0) | |
89 | ||
f1da6683 MW |
90 | static int quick(rand_pool *); |
91 | #define QUICK(r) do { \ | |
92 | quick(r); \ | |
93 | if ((r)->s && (r)->s->timer) (r)->s->timer(r); \ | |
d03ab969 | 94 | } while (0) |
95 | ||
96 | /*----- Main code ---------------------------------------------------------*/ | |
97 | ||
98 | /* --- @rand_init@ --- * | |
99 | * | |
100 | * Arguments: @rand_pool *r@ = pointer to a randomness pool | |
101 | * | |
102 | * Returns: --- | |
103 | * | |
104 | * Use: Initializes a randomness pool. The pool doesn't start out | |
ac2fd5cd | 105 | * very random: that's your job to sort out. A good suggestion |
106 | * would be to attach an appropriate noise source and call | |
107 | * @rand_seed@. | |
d03ab969 | 108 | */ |
109 | ||
110 | void rand_init(rand_pool *r) | |
111 | { | |
112 | RAND_RESOLVE(r); | |
113 | memset(r->pool, 0, sizeof(r->pool)); | |
114 | memset(r->buf, 0, sizeof(r->buf)); | |
53073dfb | 115 | r->gen = rand_generation(); |
d03ab969 | 116 | r->i = 0; |
117 | r->irot = 0; | |
118 | r->ibits = r->obits = 0; | |
119 | r->o = RAND_SECSZ; | |
d6fab4f6 MW |
120 | r->s = &noise_source; |
121 | rand_key(r, 0, 0); | |
d03ab969 | 122 | rand_gate(r); |
123 | } | |
124 | ||
125 | /* --- @rand_noisesrc@ --- * | |
126 | * | |
127 | * Arguments: @rand_pool *r@ = pointer to a randomness pool | |
128 | * @const rand_source *s@ = pointer to source definition | |
129 | * | |
130 | * Returns: --- | |
131 | * | |
132 | * Use: Sets a noise source for a randomness pool. When the pool's | |
133 | * estimate of good random bits falls to zero, the @getnoise@ | |
134 | * function is called, passing the pool handle as an argument. | |
135 | * It is expected to increase the number of good bits by at | |
136 | * least one, because it'll be called over and over again until | |
137 | * there are enough bits to satisfy the caller. The @timer@ | |
138 | * function is called frequently throughout the generator's | |
139 | * operation. | |
140 | */ | |
141 | ||
142 | void rand_noisesrc(rand_pool *r, const rand_source *s) | |
143 | { | |
144 | RAND_RESOLVE(r); | |
145 | r->s = s; | |
146 | } | |
147 | ||
f1da6683 MW |
148 | /* --- @rand_quick@ --- * |
149 | * | |
150 | * Arguments: @rand_pool *r@ = pointer to a randomness pool | |
151 | * | |
152 | * Returns: Zero on success; @-1@ on failure. | |
153 | * | |
154 | * Use Attempts to use some machine-specific `quick' source of | |
155 | * entropy to top up @r@. This may not do anything at all on | |
156 | * many systems. | |
157 | */ | |
158 | ||
159 | CPU_DISPATCH(static, return, int, quick, (rand_pool *r), (r), | |
160 | pick_quick, trivial_quick); | |
161 | ||
162 | static int trivial_quick(rand_pool *r) { return (-1); } | |
163 | ||
aaf296c8 MW |
164 | #if __GNUC__ && (CPUFAM_X86 || CPUFAM_AMD64) |
165 | static int rdrand_quick(rand_pool *r) | |
166 | { | |
167 | unsigned long rr; | |
168 | unsigned char w; | |
169 | int i; | |
170 | ||
171 | for (i = 0; i < 16; i++) { | |
172 | __asm__ ("rdrand %0; setc %1" : "=r" (rr), "=g" (w) : : "cc"); | |
173 | if (w) { | |
174 | rand_add(r, &rr, sizeof(rr), 8*sizeof(rr)); | |
175 | return (0); | |
176 | } | |
177 | } | |
178 | return (-1); | |
179 | } | |
180 | #endif | |
181 | ||
f1da6683 MW |
182 | static quick__functype *pick_quick(void) |
183 | { | |
aaf296c8 MW |
184 | #if __GNUC__ && (CPUFAM_X86 || CPUFAM_AMD64) |
185 | DISPATCH_PICK_COND(rand_quick, rdrand_quick, | |
186 | cpu_feature_p(CPUFEAT_X86_RDRAND)); | |
187 | #endif | |
f1da6683 MW |
188 | DISPATCH_PICK_FALLBACK(rand_quick, trivial_quick); |
189 | } | |
190 | ||
191 | int rand_quick(rand_pool *r) { RAND_RESOLVE(r); return (quick(r)); } | |
192 | ||
ac2fd5cd | 193 | /* --- @rand_seed@ --- * |
194 | * | |
195 | * Arguments: @rand_pool *r@ = pointer to a randomness pool | |
196 | * @unsigned bits@ = number of bits to ensure | |
197 | * | |
198 | * Returns: --- | |
199 | * | |
200 | * Use: Ensures that there are at least @bits@ good bits of entropy | |
201 | * in the pool. It is recommended that you call this after | |
202 | * initializing a new pool. Requesting @bits > RAND_IBITS@ is | |
203 | * doomed to failure (and is an error). | |
204 | */ | |
205 | ||
206 | void rand_seed(rand_pool *r, unsigned bits) | |
207 | { | |
208 | RAND_RESOLVE(r); | |
209 | ||
210 | assert(((void)"bits pointlessly large in rand_seed", bits <= RAND_IBITS)); | |
211 | assert(((void)"no noise source in rand_seed", r->s)); | |
212 | ||
213 | while (r->ibits < bits) | |
214 | r->s->getnoise(r); | |
215 | rand_gate(r); | |
216 | } | |
217 | ||
d03ab969 | 218 | /* --- @rand_key@ --- * |
219 | * | |
220 | * Arguments: @rand_pool *r@ = pointer to a randomness pool | |
221 | * @const void *k@ = pointer to key data | |
222 | * @size_t sz@ = size of key data | |
223 | * | |
224 | * Returns: --- | |
225 | * | |
226 | * Use: Sets the secret key for a randomness pool. The key is used | |
227 | * when mixing in new random bits. | |
228 | */ | |
229 | ||
230 | void rand_key(rand_pool *r, const void *k, size_t sz) | |
231 | { | |
d6fab4f6 MW |
232 | HASH_CTX hc; |
233 | octet h[HASH_SZ]; | |
234 | static const char label[] = "Catacomb random pool key"; | |
235 | ||
d03ab969 | 236 | RAND_RESOLVE(r); |
d6fab4f6 MW |
237 | |
238 | assert(HASH_SZ >= RAND_KEYSZ); | |
239 | HASH_INIT(&hc); | |
240 | HASH(&hc, label, sizeof(label)); | |
241 | if (sz) HASH(&hc, k, sz); | |
242 | HASH_DONE(&hc, h); | |
243 | memcpy(r->k.k, h, RAND_KEYSZ); | |
d03ab969 | 244 | } |
245 | ||
246 | /* --- @rand_add@ --- * | |
247 | * | |
248 | * Arguments: @rand_pool *r@ = pointer to a randomness pool | |
249 | * @const void *p@ = pointer a buffer of data to add | |
250 | * @size_t sz@ = size of the data buffer | |
251 | * @unsigned goodbits@ = number of good bits estimated in buffer | |
252 | * | |
253 | * Returns: --- | |
254 | * | |
255 | * Use: Mixes the data in the buffer with the contents of the | |
256 | * pool. The estimate of the number of good bits is added to | |
257 | * the pool's own count. The mixing operation is not | |
258 | * cryptographically strong. However, data in the input pool | |
259 | * isn't output directly, only through the one-way gating | |
260 | * operation, so that shouldn't matter. | |
261 | */ | |
262 | ||
263 | void rand_add(rand_pool *r, const void *p, size_t sz, unsigned goodbits) | |
264 | { | |
265 | const octet *c = p; | |
ba044e65 | 266 | int i, rot; |
d03ab969 | 267 | |
ba044e65 | 268 | #if RAND_POOLSZ != 128 |
d03ab969 | 269 | # error Polynomial in rand_add is out of date. Fix it. |
270 | #endif | |
271 | ||
272 | RAND_RESOLVE(r); | |
273 | ||
ba044e65 | 274 | i = r->i; rot = r->irot; |
d03ab969 | 275 | |
276 | while (sz) { | |
277 | octet o = *c++; | |
ba044e65 | 278 | r->pool[i] ^= (ROL8(o, rot) ^ |
279 | r->pool[(i + 1) % RAND_POOLSZ] ^ | |
280 | r->pool[(i + 2) % RAND_POOLSZ] ^ | |
281 | r->pool[(i + 7) % RAND_POOLSZ]); | |
d03ab969 | 282 | rot = (rot + 5) & 7; |
283 | i++; if (i >= RAND_POOLSZ) i -= RAND_POOLSZ; | |
d03ab969 | 284 | sz--; |
285 | } | |
286 | ||
287 | r->i = i; | |
288 | r->irot = rot; | |
289 | r->ibits += goodbits; | |
290 | if (r->ibits > RAND_IBITS) | |
291 | r->ibits = RAND_IBITS; | |
292 | } | |
293 | ||
294 | /* --- @rand_goodbits@ --- * | |
295 | * | |
45c0fd36 | 296 | * Arguments: @rand_pool *r@ = pointer to a randomness pool |
d03ab969 | 297 | * |
45c0fd36 | 298 | * Returns: Estimate of the number of good bits remaining in the pool. |
d03ab969 | 299 | */ |
300 | ||
301 | unsigned rand_goodbits(rand_pool *r) | |
302 | { | |
303 | RAND_RESOLVE(r); | |
304 | return (r->ibits + r->obits); | |
305 | } | |
306 | ||
307 | /* --- @rand_gate@ --- * | |
308 | * | |
309 | * Arguments: @rand_pool *r@ = pointer to a randomness pool | |
310 | * | |
311 | * Returns: --- | |
312 | * | |
313 | * Use: Mixes up the entire state of the generator in a nonreversible | |
314 | * way. | |
315 | */ | |
316 | ||
317 | void rand_gate(rand_pool *r) | |
318 | { | |
53073dfb | 319 | octet h[HASH_SZ], g[4]; |
d6fab4f6 MW |
320 | HASH_CTX hc; |
321 | CIPHER_CTX cc; | |
d03ab969 | 322 | |
323 | RAND_RESOLVE(r); | |
f1da6683 | 324 | QUICK(r); |
d03ab969 | 325 | |
326 | /* --- Hash up all the data in the pool --- */ | |
327 | ||
d6fab4f6 | 328 | HASH_INIT(&hc); |
53073dfb | 329 | STORE32(g, r->gen); HASH(&hc, g, sizeof(g)); |
d6fab4f6 MW |
330 | HASH(&hc, r->pool, RAND_POOLSZ); |
331 | HASH(&hc, r->buf, RAND_BUFSZ); | |
332 | HASH_DONE(&hc, h); | |
333 | BURN(hc); | |
d03ab969 | 334 | |
335 | /* --- Now mangle all of the data based on the hash --- */ | |
336 | ||
d6fab4f6 MW |
337 | assert(CIPHER_KEYSZ <= HASH_SZ); |
338 | CIPHER_INIT(&cc, h, CIPHER_KEYSZ, 0); | |
339 | CIPHER_ENCRYPT(&cc, r->pool, r->pool, RAND_POOLSZ); | |
340 | CIPHER_ENCRYPT(&cc, r->buf, r->buf, RAND_BUFSZ); | |
341 | BURN(cc); | |
d03ab969 | 342 | |
343 | /* --- Reset the various state variables --- */ | |
344 | ||
345 | r->o = RAND_SECSZ; | |
346 | r->obits += r->ibits; | |
347 | if (r->obits > RAND_OBITS) { | |
348 | r->ibits = r->obits - r->ibits; | |
349 | r->obits = RAND_OBITS; | |
350 | } else | |
351 | r->ibits = 0; | |
f1da6683 | 352 | QUICK(r); |
d03ab969 | 353 | } |
354 | ||
355 | /* --- @rand_stretch@ --- * | |
356 | * | |
357 | * Arguments: @rand_pool *r@ = pointer to a randomness pool | |
358 | * | |
359 | * Returns: --- | |
360 | * | |
361 | * Use: Stretches the contents of the output buffer by transforming | |
362 | * it in a nonreversible way. This doesn't add any entropy | |
363 | * worth speaking about, but it works well enough when the | |
364 | * caller doesn't care about that sort of thing. | |
365 | */ | |
366 | ||
367 | void rand_stretch(rand_pool *r) | |
368 | { | |
53073dfb | 369 | octet h[HASH_SZ], g[4]; |
d6fab4f6 MW |
370 | HASH_CTX hc; |
371 | CIPHER_CTX cc; | |
d03ab969 | 372 | |
373 | RAND_RESOLVE(r); | |
f1da6683 | 374 | QUICK(r); |
d03ab969 | 375 | |
376 | /* --- Hash up all the data in the buffer --- */ | |
377 | ||
d6fab4f6 | 378 | HASH_INIT(&hc); |
53073dfb | 379 | STORE32(g, r->gen); HASH(&hc, g, sizeof(g)); |
d6fab4f6 MW |
380 | HASH(&hc, r->pool, RAND_POOLSZ); |
381 | HASH(&hc, r->buf, RAND_BUFSZ); | |
382 | HASH_DONE(&hc, h); | |
383 | BURN(hc); | |
d03ab969 | 384 | |
d6fab4f6 | 385 | /* --- Now mangle the buffer based on the hash --- */ |
d03ab969 | 386 | |
dd188526 | 387 | assert(CIPHER_KEYSZ <= HASH_SZ); |
d6fab4f6 MW |
388 | CIPHER_INIT(&cc, h, CIPHER_KEYSZ, 0); |
389 | CIPHER_ENCRYPT(&cc, r->buf, r->buf, RAND_BUFSZ); | |
390 | BURN(cc); | |
d03ab969 | 391 | |
392 | /* --- Reset the various state variables --- */ | |
393 | ||
394 | r->o = RAND_SECSZ; | |
f1da6683 | 395 | QUICK(r); |
d03ab969 | 396 | } |
397 | ||
398 | /* --- @rand_get@ --- * | |
399 | * | |
400 | * Arguments: @rand_pool *r@ = pointer to a randomness pool | |
401 | * @void *p@ = pointer to output buffer | |
402 | * @size_t sz@ = size of output buffer | |
403 | * | |
404 | * Returns: --- | |
405 | * | |
406 | * Use: Gets random data from the pool. The pool's contents can't be | |
407 | * determined from the output of this function; nor can the | |
408 | * output data be determined from a knowledge of the data input | |
409 | * to the pool wihtout also having knowledge of the secret key. | |
410 | * The good bits counter is decremented, although no special | |
411 | * action is taken if it reaches zero. | |
412 | */ | |
413 | ||
414 | void rand_get(rand_pool *r, void *p, size_t sz) | |
415 | { | |
416 | octet *o = p; | |
417 | ||
418 | RAND_RESOLVE(r); | |
53073dfb | 419 | GENCHECK(r); |
f1da6683 | 420 | QUICK(r); |
d03ab969 | 421 | |
422 | if (!sz) | |
423 | return; | |
424 | for (;;) { | |
425 | if (r->o + sz <= RAND_BUFSZ) { | |
426 | memcpy(o, r->buf + r->o, sz); | |
427 | r->o += sz; | |
428 | break; | |
429 | } else { | |
430 | size_t chunk = RAND_BUFSZ - r->o; | |
431 | if (chunk) { | |
432 | memcpy(o, r->buf + r->o, chunk); | |
433 | sz -= chunk; | |
434 | o += chunk; | |
435 | } | |
436 | rand_stretch(r); | |
437 | } | |
438 | } | |
439 | ||
440 | if (r->obits > sz * 8) | |
441 | r->obits -= sz * 8; | |
442 | else | |
443 | r->obits = 0; | |
444 | } | |
445 | ||
446 | /* --- @rand_getgood@ --- * | |
447 | * | |
448 | * Arguments: @rand_pool *r@ = pointer to a randomness pool | |
449 | * @void *p@ = pointer to output buffer | |
450 | * @size_t sz@ = size of output buffer | |
451 | * | |
452 | * Returns: --- | |
453 | * | |
ac2fd5cd | 454 | * Use: Gets random data from the pool, ensuring that there are |
455 | * enough good bits. This interface isn't recommended: it makes | |
456 | * the generator slow, and doesn't provide much more security | |
457 | * than @rand_get@, assuming you've previously done a | |
458 | * @rand_seed@. | |
d03ab969 | 459 | */ |
460 | ||
461 | void rand_getgood(rand_pool *r, void *p, size_t sz) | |
462 | { | |
463 | octet *o = p; | |
464 | ||
465 | RAND_RESOLVE(r); | |
466 | ||
467 | if (!sz) | |
468 | return; | |
469 | if (!r->s || !r->s->getnoise) { | |
470 | rand_get(r, p, sz); | |
471 | return; | |
472 | } | |
53073dfb | 473 | GENCHECK(r); |
f1da6683 | 474 | QUICK(r); |
d03ab969 | 475 | |
476 | while (sz) { | |
477 | size_t chunk = sz; | |
478 | ||
479 | if (chunk * 8 > r->obits) { | |
480 | if (chunk * 8 > r->ibits + r->obits) | |
b056b793 | 481 | do r->s->getnoise(r); while (r->ibits + r->obits < 256); |
d03ab969 | 482 | rand_gate(r); |
483 | if (chunk * 8 > r->obits) | |
484 | chunk = r->obits / 8; | |
485 | } | |
486 | ||
487 | if (chunk + r->o > RAND_BUFSZ) | |
488 | chunk = RAND_BUFSZ - r->o; | |
489 | ||
490 | memcpy(o, r->buf + r->o, chunk); | |
aacbc1c6 | 491 | r->o += chunk; |
d03ab969 | 492 | r->obits -= chunk * 8; |
493 | o += chunk; | |
494 | sz -= chunk; | |
495 | } | |
496 | } | |
497 | ||
aacbc1c6 | 498 | /*----- Generic random number generator interface -------------------------*/ |
499 | ||
500 | static void gdestroy(grand *r) | |
501 | { | |
a7a76ebd MW |
502 | gctx *g = (gctx *)r; |
503 | if (g != &rand_global) { | |
ac2fd5cd | 504 | BURN(*g); |
505 | S_DESTROY(g); | |
506 | } | |
aacbc1c6 | 507 | } |
508 | ||
509 | static int gmisc(grand *r, unsigned op, ...) | |
510 | { | |
a7a76ebd | 511 | gctx *g = (gctx *)r; |
aacbc1c6 | 512 | va_list ap; |
513 | int rc = 0; | |
514 | va_start(ap, op); | |
515 | ||
516 | switch (op) { | |
517 | case GRAND_CHECK: | |
518 | switch (va_arg(ap, unsigned)) { | |
519 | case GRAND_CHECK: | |
520 | case GRAND_SEEDINT: | |
521 | case GRAND_SEEDUINT32: | |
522 | case GRAND_SEEDBLOCK: | |
b056b793 | 523 | case GRAND_SEEDRAND: |
aacbc1c6 | 524 | case RAND_GATE: |
525 | case RAND_STRETCH: | |
526 | case RAND_KEY: | |
527 | case RAND_NOISESRC: | |
ac2fd5cd | 528 | case RAND_SEED: |
838a6a51 | 529 | case RAND_TIMER: |
530 | case RAND_GOODBITS: | |
990dafb1 | 531 | case RAND_ADD: |
aacbc1c6 | 532 | rc = 1; |
533 | break; | |
534 | default: | |
535 | rc = 0; | |
536 | break; | |
537 | } | |
538 | break; | |
539 | case GRAND_SEEDINT: { | |
540 | unsigned u = va_arg(ap, unsigned); | |
541 | rand_add(&g->p, &u, sizeof(u), sizeof(u)); | |
542 | } break; | |
543 | case GRAND_SEEDUINT32: { | |
544 | uint32 i = va_arg(ap, uint32); | |
545 | rand_add(&g->p, &i, sizeof(i), 4); | |
546 | } break; | |
547 | case GRAND_SEEDBLOCK: { | |
548 | const void *p = va_arg(ap, const void *); | |
549 | size_t sz = va_arg(ap, size_t); | |
550 | rand_add(&g->p, p, sz, sz); | |
551 | } break; | |
b056b793 | 552 | case GRAND_SEEDRAND: { |
553 | grand *rr = va_arg(ap, grand *); | |
554 | octet buf[16]; | |
555 | rr->ops->fill(rr, buf, sizeof(buf)); | |
556 | rand_add(&g->p, buf, sizeof(buf), 8); | |
557 | } break; | |
aacbc1c6 | 558 | case RAND_GATE: |
559 | rand_gate(&g->p); | |
560 | break; | |
561 | case RAND_STRETCH: | |
562 | rand_stretch(&g->p); | |
563 | break; | |
564 | case RAND_KEY: { | |
565 | const void *k = va_arg(ap, const void *); | |
566 | size_t sz = va_arg(ap, size_t); | |
567 | rand_key(&g->p, k, sz); | |
568 | } break; | |
569 | case RAND_NOISESRC: | |
570 | rand_noisesrc(&g->p, va_arg(ap, const rand_source *)); | |
571 | break; | |
ac2fd5cd | 572 | case RAND_SEED: |
573 | rand_seed(&g->p, va_arg(ap, unsigned)); | |
574 | break; | |
838a6a51 | 575 | case RAND_TIMER: |
f1da6683 | 576 | QUICK(&g->p); |
838a6a51 | 577 | break; |
578 | case RAND_GOODBITS: | |
579 | rc = rand_goodbits(&g->p); | |
580 | break; | |
990dafb1 | 581 | case RAND_ADD: { |
582 | const void *p = va_arg(ap, const void *); | |
583 | size_t sz = va_arg(ap, size_t); | |
584 | unsigned goodbits = va_arg(ap, unsigned); | |
585 | rand_add(&g->p, p, sz, goodbits); | |
586 | } break; | |
aacbc1c6 | 587 | default: |
588 | GRAND_BADOP; | |
589 | break; | |
590 | } | |
591 | ||
592 | va_end(ap); | |
593 | return (rc); | |
594 | } | |
595 | ||
596 | static octet gbyte(grand *r) | |
597 | { | |
a7a76ebd | 598 | gctx *g = (gctx *)r; |
aacbc1c6 | 599 | octet o; |
600 | rand_getgood(&g->p, &o, 1); | |
601 | return (o); | |
602 | } | |
603 | ||
604 | static uint32 gword(grand *r) | |
605 | { | |
a7a76ebd | 606 | gctx *g = (gctx *)r; |
aacbc1c6 | 607 | octet b[4]; |
608 | rand_getgood(&g->p, &b, sizeof(b)); | |
609 | return (LOAD32(b)); | |
610 | } | |
611 | ||
612 | static void gfill(grand *r, void *p, size_t sz) | |
613 | { | |
a7a76ebd | 614 | gctx *g = (gctx *)r; |
ac2fd5cd | 615 | rand_get(&g->p, p, sz); |
aacbc1c6 | 616 | } |
617 | ||
618 | static const grand_ops gops = { | |
619 | "rand", | |
ac2fd5cd | 620 | GRAND_CRYPTO, 0, |
aacbc1c6 | 621 | gmisc, gdestroy, |
44ff6c11 | 622 | gword, gbyte, gword, grand_defaultrange, gfill |
aacbc1c6 | 623 | }; |
624 | ||
aacbc1c6 | 625 | /* --- @rand_create@ --- * |
626 | * | |
627 | * Arguments: --- | |
628 | * | |
629 | * Returns: Pointer to a generic generator. | |
630 | * | |
631 | * Use: Constructs a generic generator interface over a Catacomb | |
632 | * entropy pool generator. | |
633 | */ | |
634 | ||
635 | grand *rand_create(void) | |
636 | { | |
ac2fd5cd | 637 | gctx *g = S_CREATE(gctx); |
aacbc1c6 | 638 | g->r.ops = &gops; |
639 | rand_init(&g->p); | |
640 | return (&g->r); | |
641 | } | |
642 | ||
d03ab969 | 643 | /*----- That's all, folks -------------------------------------------------*/ |