| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * Secure random number generator |
| 4 | * |
| 5 | * (c) 1998 Straylight/Edgeware |
| 6 | */ |
| 7 | |
| 8 | /*----- Licensing notice --------------------------------------------------* |
| 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. |
| 16 | * |
| 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. |
| 21 | * |
| 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 | |
| 28 | /*----- Header files ------------------------------------------------------*/ |
| 29 | |
| 30 | #include "config.h" |
| 31 | |
| 32 | #include <stdarg.h> |
| 33 | #include <stdio.h> |
| 34 | #include <string.h> |
| 35 | |
| 36 | #include <mLib/bits.h> |
| 37 | #include <mLib/sub.h> |
| 38 | |
| 39 | #include "arena.h" |
| 40 | #include "dispatch.h" |
| 41 | #include "paranoia.h" |
| 42 | |
| 43 | #define RAND__HACKS |
| 44 | #include "rand.h" |
| 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 |
| 62 | |
| 63 | /*----- Static variables --------------------------------------------------*/ |
| 64 | |
| 65 | static const grand_ops gops; |
| 66 | |
| 67 | typedef struct rand__gctx { |
| 68 | grand r; |
| 69 | rand_pool p; |
| 70 | } gctx; |
| 71 | |
| 72 | gctx rand_global = { |
| 73 | { &gops }, |
| 74 | { { 0 }, 0, 0, 0, 0, |
| 75 | { 0 }, RAND_SECSZ, 0, |
| 76 | { "Catacomb global random byte pool" }, |
| 77 | &noise_source } |
| 78 | }; |
| 79 | |
| 80 | /*----- Macros ------------------------------------------------------------*/ |
| 81 | |
| 82 | #define RAND_RESOLVE(r) \ |
| 83 | do { if ((r) == RAND_GLOBAL) r = &rand_global.p; } while (0) |
| 84 | |
| 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 | |
| 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); \ |
| 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 |
| 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@. |
| 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)); |
| 115 | r->gen = rand_generation(); |
| 116 | r->i = 0; |
| 117 | r->irot = 0; |
| 118 | r->ibits = r->obits = 0; |
| 119 | r->o = RAND_SECSZ; |
| 120 | r->s = &noise_source; |
| 121 | rand_key(r, 0, 0); |
| 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 | |
| 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 | |
| 164 | #if CPUFAM_X86 || CPUFAM_AMD64 |
| 165 | extern int rand_quick_x86ish_rdrand(rand_pool */*r*/); |
| 166 | extern int rand_quick_x86ish_rdseed(rand_pool */*r*/); |
| 167 | #endif |
| 168 | |
| 169 | static quick__functype *pick_quick(void) |
| 170 | { |
| 171 | #if CPUFAM_X86 || CPUFAM_AMD64 |
| 172 | DISPATCH_PICK_COND(rand_quick, rand_quick_x86ish_rdseed, |
| 173 | cpu_feature_p(CPUFEAT_X86_RDSEED)); |
| 174 | DISPATCH_PICK_COND(rand_quick, rand_quick_x86ish_rdrand, |
| 175 | cpu_feature_p(CPUFEAT_X86_RDRAND)); |
| 176 | #endif |
| 177 | DISPATCH_PICK_FALLBACK(rand_quick, trivial_quick); |
| 178 | } |
| 179 | |
| 180 | int rand_quick(rand_pool *r) { RAND_RESOLVE(r); return (quick(r)); } |
| 181 | |
| 182 | /* --- @rand_seed@ --- * |
| 183 | * |
| 184 | * Arguments: @rand_pool *r@ = pointer to a randomness pool |
| 185 | * @unsigned bits@ = number of bits to ensure |
| 186 | * |
| 187 | * Returns: --- |
| 188 | * |
| 189 | * Use: Ensures that there are at least @bits@ good bits of entropy |
| 190 | * in the pool. It is recommended that you call this after |
| 191 | * initializing a new pool. Requesting @bits > RAND_IBITS@ is |
| 192 | * doomed to failure (and is an error). |
| 193 | */ |
| 194 | |
| 195 | void rand_seed(rand_pool *r, unsigned bits) |
| 196 | { |
| 197 | RAND_RESOLVE(r); |
| 198 | |
| 199 | assert(((void)"bits pointlessly large in rand_seed", bits <= RAND_IBITS)); |
| 200 | assert(((void)"no noise source in rand_seed", r->s)); |
| 201 | |
| 202 | while (r->ibits < bits) |
| 203 | r->s->getnoise(r); |
| 204 | rand_gate(r); |
| 205 | } |
| 206 | |
| 207 | /* --- @rand_key@ --- * |
| 208 | * |
| 209 | * Arguments: @rand_pool *r@ = pointer to a randomness pool |
| 210 | * @const void *k@ = pointer to key data |
| 211 | * @size_t sz@ = size of key data |
| 212 | * |
| 213 | * Returns: --- |
| 214 | * |
| 215 | * Use: Sets the secret key for a randomness pool. The key is used |
| 216 | * when mixing in new random bits. |
| 217 | */ |
| 218 | |
| 219 | void rand_key(rand_pool *r, const void *k, size_t sz) |
| 220 | { |
| 221 | HASH_CTX hc; |
| 222 | octet h[HASH_SZ]; |
| 223 | static const char label[] = "Catacomb random pool key"; |
| 224 | |
| 225 | RAND_RESOLVE(r); |
| 226 | |
| 227 | assert(HASH_SZ >= RAND_KEYSZ); |
| 228 | HASH_INIT(&hc); |
| 229 | HASH(&hc, label, sizeof(label)); |
| 230 | if (sz) HASH(&hc, k, sz); |
| 231 | HASH_DONE(&hc, h); |
| 232 | memcpy(r->k.k, h, RAND_KEYSZ); |
| 233 | } |
| 234 | |
| 235 | /* --- @rand_add@ --- * |
| 236 | * |
| 237 | * Arguments: @rand_pool *r@ = pointer to a randomness pool |
| 238 | * @const void *p@ = pointer a buffer of data to add |
| 239 | * @size_t sz@ = size of the data buffer |
| 240 | * @unsigned goodbits@ = number of good bits estimated in buffer |
| 241 | * |
| 242 | * Returns: --- |
| 243 | * |
| 244 | * Use: Mixes the data in the buffer with the contents of the |
| 245 | * pool. The estimate of the number of good bits is added to |
| 246 | * the pool's own count. The mixing operation is not |
| 247 | * cryptographically strong. However, data in the input pool |
| 248 | * isn't output directly, only through the one-way gating |
| 249 | * operation, so that shouldn't matter. |
| 250 | */ |
| 251 | |
| 252 | void rand_add(rand_pool *r, const void *p, size_t sz, unsigned goodbits) |
| 253 | { |
| 254 | const octet *c = p; |
| 255 | int i, rot; |
| 256 | |
| 257 | STATIC_ASSERT(RAND_POOLSZ == 128, "Polynomial doesn't match pool size"); |
| 258 | |
| 259 | RAND_RESOLVE(r); |
| 260 | |
| 261 | i = r->i; rot = r->irot; |
| 262 | |
| 263 | while (sz) { |
| 264 | octet o = *c++; |
| 265 | r->pool[i] ^= (ROL8(o, rot) ^ |
| 266 | r->pool[(i + 1) % RAND_POOLSZ] ^ |
| 267 | r->pool[(i + 2) % RAND_POOLSZ] ^ |
| 268 | r->pool[(i + 7) % RAND_POOLSZ]); |
| 269 | rot = (rot + 5) & 7; |
| 270 | i++; if (i >= RAND_POOLSZ) i -= RAND_POOLSZ; |
| 271 | sz--; |
| 272 | } |
| 273 | |
| 274 | r->i = i; |
| 275 | r->irot = rot; |
| 276 | r->ibits += goodbits; |
| 277 | if (r->ibits > RAND_IBITS) |
| 278 | r->ibits = RAND_IBITS; |
| 279 | } |
| 280 | |
| 281 | /* --- @rand_goodbits@ --- * |
| 282 | * |
| 283 | * Arguments: @rand_pool *r@ = pointer to a randomness pool |
| 284 | * |
| 285 | * Returns: Estimate of the number of good bits remaining in the pool. |
| 286 | */ |
| 287 | |
| 288 | unsigned rand_goodbits(rand_pool *r) |
| 289 | { |
| 290 | RAND_RESOLVE(r); |
| 291 | return (r->ibits + r->obits); |
| 292 | } |
| 293 | |
| 294 | /* --- @rand_gate@ --- * |
| 295 | * |
| 296 | * Arguments: @rand_pool *r@ = pointer to a randomness pool |
| 297 | * |
| 298 | * Returns: --- |
| 299 | * |
| 300 | * Use: Mixes up the entire state of the generator in a nonreversible |
| 301 | * way. |
| 302 | */ |
| 303 | |
| 304 | void rand_gate(rand_pool *r) |
| 305 | { |
| 306 | octet h[HASH_SZ], g[4]; |
| 307 | HASH_CTX hc; |
| 308 | CIPHER_CTX cc; |
| 309 | |
| 310 | STATIC_ASSERT(CIPHER_KEYSZ <= HASH_SZ, "rand cipher keysize too long"); |
| 311 | |
| 312 | RAND_RESOLVE(r); |
| 313 | QUICK(r); |
| 314 | |
| 315 | /* --- Hash up all the data in the pool --- */ |
| 316 | |
| 317 | HASH_INIT(&hc); |
| 318 | STORE32(g, r->gen); HASH(&hc, g, sizeof(g)); |
| 319 | HASH(&hc, r->k.k, RAND_KEYSZ); |
| 320 | HASH(&hc, r->pool, RAND_POOLSZ); |
| 321 | HASH(&hc, r->buf, RAND_BUFSZ); |
| 322 | HASH_DONE(&hc, h); |
| 323 | BURN(hc); |
| 324 | |
| 325 | /* --- Now mangle all of the data based on the hash --- */ |
| 326 | |
| 327 | CIPHER_INIT(&cc, h, CIPHER_KEYSZ, 0); |
| 328 | CIPHER_ENCRYPT(&cc, r->pool, r->pool, RAND_POOLSZ); |
| 329 | CIPHER_ENCRYPT(&cc, r->buf, r->buf, RAND_BUFSZ); |
| 330 | BURN(cc); |
| 331 | |
| 332 | /* --- Reset the various state variables --- */ |
| 333 | |
| 334 | r->o = RAND_SECSZ; |
| 335 | r->obits += r->ibits; |
| 336 | if (r->obits > RAND_OBITS) { |
| 337 | r->ibits = r->obits - RAND_OBITS; |
| 338 | r->obits = RAND_OBITS; |
| 339 | } else |
| 340 | r->ibits = 0; |
| 341 | QUICK(r); |
| 342 | } |
| 343 | |
| 344 | /* --- @rand_stretch@ --- * |
| 345 | * |
| 346 | * Arguments: @rand_pool *r@ = pointer to a randomness pool |
| 347 | * |
| 348 | * Returns: --- |
| 349 | * |
| 350 | * Use: Stretches the contents of the output buffer by transforming |
| 351 | * it in a nonreversible way. This doesn't add any entropy |
| 352 | * worth speaking about, but it works well enough when the |
| 353 | * caller doesn't care about that sort of thing. |
| 354 | */ |
| 355 | |
| 356 | void rand_stretch(rand_pool *r) |
| 357 | { |
| 358 | octet h[HASH_SZ], g[4]; |
| 359 | HASH_CTX hc; |
| 360 | CIPHER_CTX cc; |
| 361 | |
| 362 | STATIC_ASSERT(CIPHER_KEYSZ <= HASH_SZ, "rand cipher keysize too long"); |
| 363 | |
| 364 | RAND_RESOLVE(r); |
| 365 | QUICK(r); |
| 366 | |
| 367 | /* --- Hash up all the data in the buffer --- */ |
| 368 | |
| 369 | HASH_INIT(&hc); |
| 370 | STORE32(g, r->gen); HASH(&hc, g, sizeof(g)); |
| 371 | HASH(&hc, r->k.k, RAND_KEYSZ); |
| 372 | HASH(&hc, r->pool, RAND_POOLSZ); |
| 373 | HASH(&hc, r->buf, RAND_BUFSZ); |
| 374 | HASH_DONE(&hc, h); |
| 375 | BURN(hc); |
| 376 | |
| 377 | /* --- Now mangle the buffer based on the hash --- */ |
| 378 | |
| 379 | CIPHER_INIT(&cc, h, CIPHER_KEYSZ, 0); |
| 380 | CIPHER_ENCRYPT(&cc, r->buf, r->buf, RAND_BUFSZ); |
| 381 | BURN(cc); |
| 382 | |
| 383 | /* --- Reset the various state variables --- */ |
| 384 | |
| 385 | r->o = RAND_SECSZ; |
| 386 | QUICK(r); |
| 387 | } |
| 388 | |
| 389 | /* --- @rand_get@ --- * |
| 390 | * |
| 391 | * Arguments: @rand_pool *r@ = pointer to a randomness pool |
| 392 | * @void *p@ = pointer to output buffer |
| 393 | * @size_t sz@ = size of output buffer |
| 394 | * |
| 395 | * Returns: --- |
| 396 | * |
| 397 | * Use: Gets random data from the pool. The pool's contents can't be |
| 398 | * determined from the output of this function; nor can the |
| 399 | * output data be determined from a knowledge of the data input |
| 400 | * to the pool wihtout also having knowledge of the secret key. |
| 401 | * The good bits counter is decremented, although no special |
| 402 | * action is taken if it reaches zero. |
| 403 | */ |
| 404 | |
| 405 | void rand_get(rand_pool *r, void *p, size_t sz) |
| 406 | { |
| 407 | octet *o = p; |
| 408 | |
| 409 | RAND_RESOLVE(r); |
| 410 | GENCHECK(r); |
| 411 | QUICK(r); |
| 412 | |
| 413 | if (!sz) |
| 414 | return; |
| 415 | for (;;) { |
| 416 | if (sz <= RAND_BUFSZ - r->o) { |
| 417 | memcpy(o, r->buf + r->o, sz); |
| 418 | r->o += sz; |
| 419 | break; |
| 420 | } else { |
| 421 | size_t chunk = RAND_BUFSZ - r->o; |
| 422 | if (chunk) { |
| 423 | memcpy(o, r->buf + r->o, chunk); |
| 424 | sz -= chunk; |
| 425 | o += chunk; |
| 426 | } |
| 427 | rand_stretch(r); |
| 428 | } |
| 429 | } |
| 430 | |
| 431 | if (r->obits > sz * 8) |
| 432 | r->obits -= sz * 8; |
| 433 | else |
| 434 | r->obits = 0; |
| 435 | } |
| 436 | |
| 437 | /* --- @rand_getgood@ --- * |
| 438 | * |
| 439 | * Arguments: @rand_pool *r@ = pointer to a randomness pool |
| 440 | * @void *p@ = pointer to output buffer |
| 441 | * @size_t sz@ = size of output buffer |
| 442 | * |
| 443 | * Returns: --- |
| 444 | * |
| 445 | * Use: Gets random data from the pool, ensuring that there are |
| 446 | * enough good bits. This interface isn't recommended: it makes |
| 447 | * the generator slow, and doesn't provide much more security |
| 448 | * than @rand_get@, assuming you've previously done a |
| 449 | * @rand_seed@. |
| 450 | */ |
| 451 | |
| 452 | void rand_getgood(rand_pool *r, void *p, size_t sz) |
| 453 | { |
| 454 | octet *o = p; |
| 455 | |
| 456 | RAND_RESOLVE(r); |
| 457 | |
| 458 | if (!sz) |
| 459 | return; |
| 460 | if (!r->s || !r->s->getnoise) { |
| 461 | rand_get(r, p, sz); |
| 462 | return; |
| 463 | } |
| 464 | GENCHECK(r); |
| 465 | QUICK(r); |
| 466 | |
| 467 | while (sz) { |
| 468 | size_t chunk = sz; |
| 469 | |
| 470 | if (chunk * 8 > r->obits) { |
| 471 | if (chunk * 8 > r->ibits + r->obits) |
| 472 | do r->s->getnoise(r); while (r->ibits + r->obits < 256); |
| 473 | rand_gate(r); |
| 474 | if (chunk * 8 > r->obits) |
| 475 | chunk = r->obits / 8; |
| 476 | } |
| 477 | |
| 478 | if (chunk <= RAND_BUFSZ - r->o) { |
| 479 | memcpy(o, r->buf + r->o, chunk); |
| 480 | r->o += chunk; |
| 481 | } else { |
| 482 | chunk = RAND_BUFSZ - r->o; |
| 483 | memcpy(o, r->buf + r->o, chunk); |
| 484 | rand_stretch(r); |
| 485 | } |
| 486 | |
| 487 | r->obits -= chunk * 8; |
| 488 | o += chunk; |
| 489 | sz -= chunk; |
| 490 | } |
| 491 | } |
| 492 | |
| 493 | /*----- Generic random number generator interface -------------------------*/ |
| 494 | |
| 495 | static void gdestroy(grand *r) |
| 496 | { |
| 497 | gctx *g = (gctx *)r; |
| 498 | if (g != &rand_global) { |
| 499 | BURN(*g); |
| 500 | S_DESTROY(g); |
| 501 | } |
| 502 | } |
| 503 | |
| 504 | static int gmisc(grand *r, unsigned op, ...) |
| 505 | { |
| 506 | gctx *g = (gctx *)r; |
| 507 | va_list ap; |
| 508 | int rc = 0; |
| 509 | va_start(ap, op); |
| 510 | |
| 511 | switch (op) { |
| 512 | case GRAND_CHECK: |
| 513 | switch (va_arg(ap, unsigned)) { |
| 514 | case GRAND_CHECK: |
| 515 | case GRAND_SEEDINT: |
| 516 | case GRAND_SEEDUINT32: |
| 517 | case GRAND_SEEDBLOCK: |
| 518 | case GRAND_SEEDRAND: |
| 519 | case RAND_GATE: |
| 520 | case RAND_STRETCH: |
| 521 | case RAND_KEY: |
| 522 | case RAND_NOISESRC: |
| 523 | case RAND_SEED: |
| 524 | case RAND_TIMER: |
| 525 | case RAND_GOODBITS: |
| 526 | case RAND_ADD: |
| 527 | rc = 1; |
| 528 | break; |
| 529 | default: |
| 530 | rc = 0; |
| 531 | break; |
| 532 | } |
| 533 | break; |
| 534 | case GRAND_SEEDINT: { |
| 535 | unsigned u = va_arg(ap, unsigned); |
| 536 | rand_add(&g->p, &u, sizeof(u), sizeof(u)); |
| 537 | } break; |
| 538 | case GRAND_SEEDUINT32: { |
| 539 | uint32 i = va_arg(ap, uint32); |
| 540 | rand_add(&g->p, &i, sizeof(i), 4); |
| 541 | } break; |
| 542 | case GRAND_SEEDBLOCK: { |
| 543 | const void *p = va_arg(ap, const void *); |
| 544 | size_t sz = va_arg(ap, size_t); |
| 545 | rand_add(&g->p, p, sz, sz); |
| 546 | } break; |
| 547 | case GRAND_SEEDRAND: { |
| 548 | grand *rr = va_arg(ap, grand *); |
| 549 | octet buf[16]; |
| 550 | rr->ops->fill(rr, buf, sizeof(buf)); |
| 551 | rand_add(&g->p, buf, sizeof(buf), 8); |
| 552 | } break; |
| 553 | case RAND_GATE: |
| 554 | rand_gate(&g->p); |
| 555 | break; |
| 556 | case RAND_STRETCH: |
| 557 | rand_stretch(&g->p); |
| 558 | break; |
| 559 | case RAND_KEY: { |
| 560 | const void *k = va_arg(ap, const void *); |
| 561 | size_t sz = va_arg(ap, size_t); |
| 562 | rand_key(&g->p, k, sz); |
| 563 | } break; |
| 564 | case RAND_NOISESRC: |
| 565 | rand_noisesrc(&g->p, va_arg(ap, const rand_source *)); |
| 566 | break; |
| 567 | case RAND_SEED: |
| 568 | rand_seed(&g->p, va_arg(ap, unsigned)); |
| 569 | break; |
| 570 | case RAND_TIMER: |
| 571 | QUICK(&g->p); |
| 572 | break; |
| 573 | case RAND_GOODBITS: |
| 574 | rc = rand_goodbits(&g->p); |
| 575 | break; |
| 576 | case RAND_ADD: { |
| 577 | const void *p = va_arg(ap, const void *); |
| 578 | size_t sz = va_arg(ap, size_t); |
| 579 | unsigned goodbits = va_arg(ap, unsigned); |
| 580 | rand_add(&g->p, p, sz, goodbits); |
| 581 | } break; |
| 582 | default: |
| 583 | GRAND_BADOP; |
| 584 | break; |
| 585 | } |
| 586 | |
| 587 | va_end(ap); |
| 588 | return (rc); |
| 589 | } |
| 590 | |
| 591 | static octet gbyte(grand *r) |
| 592 | { |
| 593 | gctx *g = (gctx *)r; |
| 594 | octet o; |
| 595 | rand_getgood(&g->p, &o, 1); |
| 596 | return (o); |
| 597 | } |
| 598 | |
| 599 | static uint32 gword(grand *r) |
| 600 | { |
| 601 | gctx *g = (gctx *)r; |
| 602 | octet b[4]; |
| 603 | rand_getgood(&g->p, &b, sizeof(b)); |
| 604 | return (LOAD32(b)); |
| 605 | } |
| 606 | |
| 607 | static void gfill(grand *r, void *p, size_t sz) |
| 608 | { |
| 609 | gctx *g = (gctx *)r; |
| 610 | rand_get(&g->p, p, sz); |
| 611 | } |
| 612 | |
| 613 | static const grand_ops gops = { |
| 614 | "rand", |
| 615 | GRAND_CRYPTO, 0, |
| 616 | gmisc, gdestroy, |
| 617 | gword, gbyte, gword, grand_defaultrange, gfill |
| 618 | }; |
| 619 | |
| 620 | /* --- @rand_create@ --- * |
| 621 | * |
| 622 | * Arguments: --- |
| 623 | * |
| 624 | * Returns: Pointer to a generic generator. |
| 625 | * |
| 626 | * Use: Constructs a generic generator interface over a Catacomb |
| 627 | * entropy pool generator. |
| 628 | */ |
| 629 | |
| 630 | grand *rand_create(void) |
| 631 | { |
| 632 | gctx *g = S_CREATE(gctx); |
| 633 | g->r.ops = &gops; |
| 634 | rand_init(&g->p); |
| 635 | return (&g->r); |
| 636 | } |
| 637 | |
| 638 | /*----- That's all, folks -------------------------------------------------*/ |