Commit | Line | Data |
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d03ab969 | 1 | /* -*-c-*- |
d03ab969 | 2 | * |
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; | |
c6c463ee MW |
168 | int i = 16; |
169 | ||
170 | __asm__ ("0: rdrand %0; jc 9f; dec %1; jnz 0b; 9:" | |
171 | : "=r" (rr), "=r" (i) : "1" (i) : "cc"); | |
172 | if (!i) return (-1); | |
173 | rand_add(r, &rr, sizeof(rr), 8*sizeof(rr)); | |
174 | return (0); | |
aaf296c8 MW |
175 | } |
176 | #endif | |
177 | ||
f1da6683 MW |
178 | static quick__functype *pick_quick(void) |
179 | { | |
aaf296c8 MW |
180 | #if __GNUC__ && (CPUFAM_X86 || CPUFAM_AMD64) |
181 | DISPATCH_PICK_COND(rand_quick, rdrand_quick, | |
182 | cpu_feature_p(CPUFEAT_X86_RDRAND)); | |
183 | #endif | |
f1da6683 MW |
184 | DISPATCH_PICK_FALLBACK(rand_quick, trivial_quick); |
185 | } | |
186 | ||
187 | int rand_quick(rand_pool *r) { RAND_RESOLVE(r); return (quick(r)); } | |
188 | ||
ac2fd5cd | 189 | /* --- @rand_seed@ --- * |
190 | * | |
191 | * Arguments: @rand_pool *r@ = pointer to a randomness pool | |
192 | * @unsigned bits@ = number of bits to ensure | |
193 | * | |
194 | * Returns: --- | |
195 | * | |
196 | * Use: Ensures that there are at least @bits@ good bits of entropy | |
197 | * in the pool. It is recommended that you call this after | |
198 | * initializing a new pool. Requesting @bits > RAND_IBITS@ is | |
199 | * doomed to failure (and is an error). | |
200 | */ | |
201 | ||
202 | void rand_seed(rand_pool *r, unsigned bits) | |
203 | { | |
204 | RAND_RESOLVE(r); | |
205 | ||
206 | assert(((void)"bits pointlessly large in rand_seed", bits <= RAND_IBITS)); | |
207 | assert(((void)"no noise source in rand_seed", r->s)); | |
208 | ||
209 | while (r->ibits < bits) | |
210 | r->s->getnoise(r); | |
211 | rand_gate(r); | |
212 | } | |
213 | ||
d03ab969 | 214 | /* --- @rand_key@ --- * |
215 | * | |
216 | * Arguments: @rand_pool *r@ = pointer to a randomness pool | |
217 | * @const void *k@ = pointer to key data | |
218 | * @size_t sz@ = size of key data | |
219 | * | |
220 | * Returns: --- | |
221 | * | |
222 | * Use: Sets the secret key for a randomness pool. The key is used | |
223 | * when mixing in new random bits. | |
224 | */ | |
225 | ||
226 | void rand_key(rand_pool *r, const void *k, size_t sz) | |
227 | { | |
d6fab4f6 MW |
228 | HASH_CTX hc; |
229 | octet h[HASH_SZ]; | |
230 | static const char label[] = "Catacomb random pool key"; | |
231 | ||
d03ab969 | 232 | RAND_RESOLVE(r); |
d6fab4f6 MW |
233 | |
234 | assert(HASH_SZ >= RAND_KEYSZ); | |
235 | HASH_INIT(&hc); | |
236 | HASH(&hc, label, sizeof(label)); | |
237 | if (sz) HASH(&hc, k, sz); | |
238 | HASH_DONE(&hc, h); | |
239 | memcpy(r->k.k, h, RAND_KEYSZ); | |
d03ab969 | 240 | } |
241 | ||
242 | /* --- @rand_add@ --- * | |
243 | * | |
244 | * Arguments: @rand_pool *r@ = pointer to a randomness pool | |
245 | * @const void *p@ = pointer a buffer of data to add | |
246 | * @size_t sz@ = size of the data buffer | |
247 | * @unsigned goodbits@ = number of good bits estimated in buffer | |
248 | * | |
249 | * Returns: --- | |
250 | * | |
251 | * Use: Mixes the data in the buffer with the contents of the | |
252 | * pool. The estimate of the number of good bits is added to | |
253 | * the pool's own count. The mixing operation is not | |
254 | * cryptographically strong. However, data in the input pool | |
255 | * isn't output directly, only through the one-way gating | |
256 | * operation, so that shouldn't matter. | |
257 | */ | |
258 | ||
259 | void rand_add(rand_pool *r, const void *p, size_t sz, unsigned goodbits) | |
260 | { | |
261 | const octet *c = p; | |
ba044e65 | 262 | int i, rot; |
d03ab969 | 263 | |
ba044e65 | 264 | #if RAND_POOLSZ != 128 |
d03ab969 | 265 | # error Polynomial in rand_add is out of date. Fix it. |
266 | #endif | |
267 | ||
268 | RAND_RESOLVE(r); | |
269 | ||
ba044e65 | 270 | i = r->i; rot = r->irot; |
d03ab969 | 271 | |
272 | while (sz) { | |
273 | octet o = *c++; | |
ba044e65 | 274 | r->pool[i] ^= (ROL8(o, rot) ^ |
275 | r->pool[(i + 1) % RAND_POOLSZ] ^ | |
276 | r->pool[(i + 2) % RAND_POOLSZ] ^ | |
277 | r->pool[(i + 7) % RAND_POOLSZ]); | |
d03ab969 | 278 | rot = (rot + 5) & 7; |
279 | i++; if (i >= RAND_POOLSZ) i -= RAND_POOLSZ; | |
d03ab969 | 280 | sz--; |
281 | } | |
282 | ||
283 | r->i = i; | |
284 | r->irot = rot; | |
285 | r->ibits += goodbits; | |
286 | if (r->ibits > RAND_IBITS) | |
287 | r->ibits = RAND_IBITS; | |
288 | } | |
289 | ||
290 | /* --- @rand_goodbits@ --- * | |
291 | * | |
45c0fd36 | 292 | * Arguments: @rand_pool *r@ = pointer to a randomness pool |
d03ab969 | 293 | * |
45c0fd36 | 294 | * Returns: Estimate of the number of good bits remaining in the pool. |
d03ab969 | 295 | */ |
296 | ||
297 | unsigned rand_goodbits(rand_pool *r) | |
298 | { | |
299 | RAND_RESOLVE(r); | |
300 | return (r->ibits + r->obits); | |
301 | } | |
302 | ||
303 | /* --- @rand_gate@ --- * | |
304 | * | |
305 | * Arguments: @rand_pool *r@ = pointer to a randomness pool | |
306 | * | |
307 | * Returns: --- | |
308 | * | |
309 | * Use: Mixes up the entire state of the generator in a nonreversible | |
310 | * way. | |
311 | */ | |
312 | ||
313 | void rand_gate(rand_pool *r) | |
314 | { | |
53073dfb | 315 | octet h[HASH_SZ], g[4]; |
d6fab4f6 MW |
316 | HASH_CTX hc; |
317 | CIPHER_CTX cc; | |
d03ab969 | 318 | |
319 | RAND_RESOLVE(r); | |
f1da6683 | 320 | QUICK(r); |
d03ab969 | 321 | |
322 | /* --- Hash up all the data in the pool --- */ | |
323 | ||
d6fab4f6 | 324 | HASH_INIT(&hc); |
53073dfb | 325 | STORE32(g, r->gen); HASH(&hc, g, sizeof(g)); |
d6fab4f6 MW |
326 | HASH(&hc, r->pool, RAND_POOLSZ); |
327 | HASH(&hc, r->buf, RAND_BUFSZ); | |
328 | HASH_DONE(&hc, h); | |
329 | BURN(hc); | |
d03ab969 | 330 | |
331 | /* --- Now mangle all of the data based on the hash --- */ | |
332 | ||
d6fab4f6 MW |
333 | assert(CIPHER_KEYSZ <= HASH_SZ); |
334 | CIPHER_INIT(&cc, h, CIPHER_KEYSZ, 0); | |
335 | CIPHER_ENCRYPT(&cc, r->pool, r->pool, RAND_POOLSZ); | |
336 | CIPHER_ENCRYPT(&cc, r->buf, r->buf, RAND_BUFSZ); | |
337 | BURN(cc); | |
d03ab969 | 338 | |
339 | /* --- Reset the various state variables --- */ | |
340 | ||
341 | r->o = RAND_SECSZ; | |
342 | r->obits += r->ibits; | |
343 | if (r->obits > RAND_OBITS) { | |
344 | r->ibits = r->obits - r->ibits; | |
345 | r->obits = RAND_OBITS; | |
346 | } else | |
347 | r->ibits = 0; | |
f1da6683 | 348 | QUICK(r); |
d03ab969 | 349 | } |
350 | ||
351 | /* --- @rand_stretch@ --- * | |
352 | * | |
353 | * Arguments: @rand_pool *r@ = pointer to a randomness pool | |
354 | * | |
355 | * Returns: --- | |
356 | * | |
357 | * Use: Stretches the contents of the output buffer by transforming | |
358 | * it in a nonreversible way. This doesn't add any entropy | |
359 | * worth speaking about, but it works well enough when the | |
360 | * caller doesn't care about that sort of thing. | |
361 | */ | |
362 | ||
363 | void rand_stretch(rand_pool *r) | |
364 | { | |
53073dfb | 365 | octet h[HASH_SZ], g[4]; |
d6fab4f6 MW |
366 | HASH_CTX hc; |
367 | CIPHER_CTX cc; | |
d03ab969 | 368 | |
369 | RAND_RESOLVE(r); | |
f1da6683 | 370 | QUICK(r); |
d03ab969 | 371 | |
372 | /* --- Hash up all the data in the buffer --- */ | |
373 | ||
d6fab4f6 | 374 | HASH_INIT(&hc); |
53073dfb | 375 | STORE32(g, r->gen); HASH(&hc, g, sizeof(g)); |
d6fab4f6 MW |
376 | HASH(&hc, r->pool, RAND_POOLSZ); |
377 | HASH(&hc, r->buf, RAND_BUFSZ); | |
378 | HASH_DONE(&hc, h); | |
379 | BURN(hc); | |
d03ab969 | 380 | |
d6fab4f6 | 381 | /* --- Now mangle the buffer based on the hash --- */ |
d03ab969 | 382 | |
dd188526 | 383 | assert(CIPHER_KEYSZ <= HASH_SZ); |
d6fab4f6 MW |
384 | CIPHER_INIT(&cc, h, CIPHER_KEYSZ, 0); |
385 | CIPHER_ENCRYPT(&cc, r->buf, r->buf, RAND_BUFSZ); | |
386 | BURN(cc); | |
d03ab969 | 387 | |
388 | /* --- Reset the various state variables --- */ | |
389 | ||
390 | r->o = RAND_SECSZ; | |
f1da6683 | 391 | QUICK(r); |
d03ab969 | 392 | } |
393 | ||
394 | /* --- @rand_get@ --- * | |
395 | * | |
396 | * Arguments: @rand_pool *r@ = pointer to a randomness pool | |
397 | * @void *p@ = pointer to output buffer | |
398 | * @size_t sz@ = size of output buffer | |
399 | * | |
400 | * Returns: --- | |
401 | * | |
402 | * Use: Gets random data from the pool. The pool's contents can't be | |
403 | * determined from the output of this function; nor can the | |
404 | * output data be determined from a knowledge of the data input | |
405 | * to the pool wihtout also having knowledge of the secret key. | |
406 | * The good bits counter is decremented, although no special | |
407 | * action is taken if it reaches zero. | |
408 | */ | |
409 | ||
410 | void rand_get(rand_pool *r, void *p, size_t sz) | |
411 | { | |
412 | octet *o = p; | |
413 | ||
414 | RAND_RESOLVE(r); | |
53073dfb | 415 | GENCHECK(r); |
f1da6683 | 416 | QUICK(r); |
d03ab969 | 417 | |
418 | if (!sz) | |
419 | return; | |
420 | for (;;) { | |
421 | if (r->o + sz <= RAND_BUFSZ) { | |
422 | memcpy(o, r->buf + r->o, sz); | |
423 | r->o += sz; | |
424 | break; | |
425 | } else { | |
426 | size_t chunk = RAND_BUFSZ - r->o; | |
427 | if (chunk) { | |
428 | memcpy(o, r->buf + r->o, chunk); | |
429 | sz -= chunk; | |
430 | o += chunk; | |
431 | } | |
432 | rand_stretch(r); | |
433 | } | |
434 | } | |
435 | ||
436 | if (r->obits > sz * 8) | |
437 | r->obits -= sz * 8; | |
438 | else | |
439 | r->obits = 0; | |
440 | } | |
441 | ||
442 | /* --- @rand_getgood@ --- * | |
443 | * | |
444 | * Arguments: @rand_pool *r@ = pointer to a randomness pool | |
445 | * @void *p@ = pointer to output buffer | |
446 | * @size_t sz@ = size of output buffer | |
447 | * | |
448 | * Returns: --- | |
449 | * | |
ac2fd5cd | 450 | * Use: Gets random data from the pool, ensuring that there are |
451 | * enough good bits. This interface isn't recommended: it makes | |
452 | * the generator slow, and doesn't provide much more security | |
453 | * than @rand_get@, assuming you've previously done a | |
454 | * @rand_seed@. | |
d03ab969 | 455 | */ |
456 | ||
457 | void rand_getgood(rand_pool *r, void *p, size_t sz) | |
458 | { | |
459 | octet *o = p; | |
460 | ||
461 | RAND_RESOLVE(r); | |
462 | ||
463 | if (!sz) | |
464 | return; | |
465 | if (!r->s || !r->s->getnoise) { | |
466 | rand_get(r, p, sz); | |
467 | return; | |
468 | } | |
53073dfb | 469 | GENCHECK(r); |
f1da6683 | 470 | QUICK(r); |
d03ab969 | 471 | |
472 | while (sz) { | |
473 | size_t chunk = sz; | |
474 | ||
475 | if (chunk * 8 > r->obits) { | |
476 | if (chunk * 8 > r->ibits + r->obits) | |
b056b793 | 477 | do r->s->getnoise(r); while (r->ibits + r->obits < 256); |
d03ab969 | 478 | rand_gate(r); |
479 | if (chunk * 8 > r->obits) | |
480 | chunk = r->obits / 8; | |
481 | } | |
482 | ||
483 | if (chunk + r->o > RAND_BUFSZ) | |
484 | chunk = RAND_BUFSZ - r->o; | |
485 | ||
486 | memcpy(o, r->buf + r->o, chunk); | |
aacbc1c6 | 487 | r->o += chunk; |
d03ab969 | 488 | r->obits -= chunk * 8; |
489 | o += chunk; | |
490 | sz -= chunk; | |
491 | } | |
492 | } | |
493 | ||
aacbc1c6 | 494 | /*----- Generic random number generator interface -------------------------*/ |
495 | ||
496 | static void gdestroy(grand *r) | |
497 | { | |
a7a76ebd MW |
498 | gctx *g = (gctx *)r; |
499 | if (g != &rand_global) { | |
ac2fd5cd | 500 | BURN(*g); |
501 | S_DESTROY(g); | |
502 | } | |
aacbc1c6 | 503 | } |
504 | ||
505 | static int gmisc(grand *r, unsigned op, ...) | |
506 | { | |
a7a76ebd | 507 | gctx *g = (gctx *)r; |
aacbc1c6 | 508 | va_list ap; |
509 | int rc = 0; | |
510 | va_start(ap, op); | |
511 | ||
512 | switch (op) { | |
513 | case GRAND_CHECK: | |
514 | switch (va_arg(ap, unsigned)) { | |
515 | case GRAND_CHECK: | |
516 | case GRAND_SEEDINT: | |
517 | case GRAND_SEEDUINT32: | |
518 | case GRAND_SEEDBLOCK: | |
b056b793 | 519 | case GRAND_SEEDRAND: |
aacbc1c6 | 520 | case RAND_GATE: |
521 | case RAND_STRETCH: | |
522 | case RAND_KEY: | |
523 | case RAND_NOISESRC: | |
ac2fd5cd | 524 | case RAND_SEED: |
838a6a51 | 525 | case RAND_TIMER: |
526 | case RAND_GOODBITS: | |
990dafb1 | 527 | case RAND_ADD: |
aacbc1c6 | 528 | rc = 1; |
529 | break; | |
530 | default: | |
531 | rc = 0; | |
532 | break; | |
533 | } | |
534 | break; | |
535 | case GRAND_SEEDINT: { | |
536 | unsigned u = va_arg(ap, unsigned); | |
537 | rand_add(&g->p, &u, sizeof(u), sizeof(u)); | |
538 | } break; | |
539 | case GRAND_SEEDUINT32: { | |
540 | uint32 i = va_arg(ap, uint32); | |
541 | rand_add(&g->p, &i, sizeof(i), 4); | |
542 | } break; | |
543 | case GRAND_SEEDBLOCK: { | |
544 | const void *p = va_arg(ap, const void *); | |
545 | size_t sz = va_arg(ap, size_t); | |
546 | rand_add(&g->p, p, sz, sz); | |
547 | } break; | |
b056b793 | 548 | case GRAND_SEEDRAND: { |
549 | grand *rr = va_arg(ap, grand *); | |
550 | octet buf[16]; | |
551 | rr->ops->fill(rr, buf, sizeof(buf)); | |
552 | rand_add(&g->p, buf, sizeof(buf), 8); | |
553 | } break; | |
aacbc1c6 | 554 | case RAND_GATE: |
555 | rand_gate(&g->p); | |
556 | break; | |
557 | case RAND_STRETCH: | |
558 | rand_stretch(&g->p); | |
559 | break; | |
560 | case RAND_KEY: { | |
561 | const void *k = va_arg(ap, const void *); | |
562 | size_t sz = va_arg(ap, size_t); | |
563 | rand_key(&g->p, k, sz); | |
564 | } break; | |
565 | case RAND_NOISESRC: | |
566 | rand_noisesrc(&g->p, va_arg(ap, const rand_source *)); | |
567 | break; | |
ac2fd5cd | 568 | case RAND_SEED: |
569 | rand_seed(&g->p, va_arg(ap, unsigned)); | |
570 | break; | |
838a6a51 | 571 | case RAND_TIMER: |
f1da6683 | 572 | QUICK(&g->p); |
838a6a51 | 573 | break; |
574 | case RAND_GOODBITS: | |
575 | rc = rand_goodbits(&g->p); | |
576 | break; | |
990dafb1 | 577 | case RAND_ADD: { |
578 | const void *p = va_arg(ap, const void *); | |
579 | size_t sz = va_arg(ap, size_t); | |
580 | unsigned goodbits = va_arg(ap, unsigned); | |
581 | rand_add(&g->p, p, sz, goodbits); | |
582 | } break; | |
aacbc1c6 | 583 | default: |
584 | GRAND_BADOP; | |
585 | break; | |
586 | } | |
587 | ||
588 | va_end(ap); | |
589 | return (rc); | |
590 | } | |
591 | ||
592 | static octet gbyte(grand *r) | |
593 | { | |
a7a76ebd | 594 | gctx *g = (gctx *)r; |
aacbc1c6 | 595 | octet o; |
596 | rand_getgood(&g->p, &o, 1); | |
597 | return (o); | |
598 | } | |
599 | ||
600 | static uint32 gword(grand *r) | |
601 | { | |
a7a76ebd | 602 | gctx *g = (gctx *)r; |
aacbc1c6 | 603 | octet b[4]; |
604 | rand_getgood(&g->p, &b, sizeof(b)); | |
605 | return (LOAD32(b)); | |
606 | } | |
607 | ||
608 | static void gfill(grand *r, void *p, size_t sz) | |
609 | { | |
a7a76ebd | 610 | gctx *g = (gctx *)r; |
ac2fd5cd | 611 | rand_get(&g->p, p, sz); |
aacbc1c6 | 612 | } |
613 | ||
614 | static const grand_ops gops = { | |
615 | "rand", | |
ac2fd5cd | 616 | GRAND_CRYPTO, 0, |
aacbc1c6 | 617 | gmisc, gdestroy, |
44ff6c11 | 618 | gword, gbyte, gword, grand_defaultrange, gfill |
aacbc1c6 | 619 | }; |
620 | ||
aacbc1c6 | 621 | /* --- @rand_create@ --- * |
622 | * | |
623 | * Arguments: --- | |
624 | * | |
625 | * Returns: Pointer to a generic generator. | |
626 | * | |
627 | * Use: Constructs a generic generator interface over a Catacomb | |
628 | * entropy pool generator. | |
629 | */ | |
630 | ||
631 | grand *rand_create(void) | |
632 | { | |
ac2fd5cd | 633 | gctx *g = S_CREATE(gctx); |
aacbc1c6 | 634 | g->r.ops = &gops; |
635 | rand_init(&g->p); | |
636 | return (&g->r); | |
637 | } | |
638 | ||
d03ab969 | 639 | /*----- That's all, folks -------------------------------------------------*/ |