1/* 2 * Software async crypto daemon. 3 * 4 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the Free 8 * Software Foundation; either version 2 of the License, or (at your option) 9 * any later version. 10 * 11 */ 12 13#include <crypto/algapi.h> 14#include <crypto/internal/hash.h> 15#include <crypto/cryptd.h> 16#include <crypto/crypto_wq.h> 17#include <linux/err.h> 18#include <linux/init.h> 19#include <linux/kernel.h> 20#include <linux/list.h> 21#include <linux/module.h> 22#include <linux/scatterlist.h> 23#include <linux/sched.h> 24#include <linux/slab.h> 25 26#define CRYPTD_MAX_CPU_QLEN 100 27 28struct cryptd_cpu_queue { 29 struct crypto_queue queue; 30 struct work_struct work; 31}; 32 33struct cryptd_queue { 34 struct cryptd_cpu_queue __percpu *cpu_queue; 35}; 36 37struct cryptd_instance_ctx { 38 struct crypto_spawn spawn; 39 struct cryptd_queue *queue; 40}; 41 42struct hashd_instance_ctx { 43 struct crypto_shash_spawn spawn; 44 struct cryptd_queue *queue; 45}; 46 47struct cryptd_blkcipher_ctx { 48 struct crypto_blkcipher *child; 49}; 50 51struct cryptd_blkcipher_request_ctx { 52 crypto_completion_t complete; 53}; 54 55struct cryptd_hash_ctx { 56 struct crypto_shash *child; 57}; 58 59struct cryptd_hash_request_ctx { 60 crypto_completion_t complete; 61 struct shash_desc desc; 62}; 63 64static void cryptd_queue_worker(struct work_struct *work); 65 66static int cryptd_init_queue(struct cryptd_queue *queue, 67 unsigned int max_cpu_qlen) 68{ 69 int cpu; 70 struct cryptd_cpu_queue *cpu_queue; 71 72 queue->cpu_queue = alloc_percpu(struct cryptd_cpu_queue); 73 if (!queue->cpu_queue) 74 return -ENOMEM; 75 for_each_possible_cpu(cpu) { 76 cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu); 77 crypto_init_queue(&cpu_queue->queue, max_cpu_qlen); 78 INIT_WORK(&cpu_queue->work, cryptd_queue_worker); 79 } 80 return 0; 81} 82 83static void cryptd_fini_queue(struct cryptd_queue *queue) 84{ 85 int cpu; 86 struct cryptd_cpu_queue *cpu_queue; 87 88 for_each_possible_cpu(cpu) { 89 cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu); 90 BUG_ON(cpu_queue->queue.qlen); 91 } 92 free_percpu(queue->cpu_queue); 93} 94 95static int cryptd_enqueue_request(struct cryptd_queue *queue, 96 struct crypto_async_request *request) 97{ 98 int cpu, err; 99 struct cryptd_cpu_queue *cpu_queue; 100 101 cpu = get_cpu(); 102 cpu_queue = this_cpu_ptr(queue->cpu_queue); 103 err = crypto_enqueue_request(&cpu_queue->queue, request); 104 queue_work_on(cpu, kcrypto_wq, &cpu_queue->work); 105 put_cpu(); 106 107 return err; 108} 109 110/* Called in workqueue context, do one real cryption work (via 111 * req->complete) and reschedule itself if there are more work to 112 * do. */ 113static void cryptd_queue_worker(struct work_struct *work) 114{ 115 struct cryptd_cpu_queue *cpu_queue; 116 struct crypto_async_request *req, *backlog; 117 118 cpu_queue = container_of(work, struct cryptd_cpu_queue, work); 119 /* Only handle one request at a time to avoid hogging crypto 120 * workqueue. preempt_disable/enable is used to prevent 121 * being preempted by cryptd_enqueue_request() */ 122 preempt_disable(); 123 backlog = crypto_get_backlog(&cpu_queue->queue); 124 req = crypto_dequeue_request(&cpu_queue->queue); 125 preempt_enable(); 126 127 if (!req) 128 return; 129 130 if (backlog) 131 backlog->complete(backlog, -EINPROGRESS); 132 req->complete(req, 0); 133 134 if (cpu_queue->queue.qlen) 135 queue_work(kcrypto_wq, &cpu_queue->work); 136} 137 138static inline struct cryptd_queue *cryptd_get_queue(struct crypto_tfm *tfm) 139{ 140 struct crypto_instance *inst = crypto_tfm_alg_instance(tfm); 141 struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst); 142 return ictx->queue; 143} 144 145static int cryptd_blkcipher_setkey(struct crypto_ablkcipher *parent, 146 const u8 *key, unsigned int keylen) 147{ 148 struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(parent); 149 struct crypto_blkcipher *child = ctx->child; 150 int err; 151 152 crypto_blkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK); 153 crypto_blkcipher_set_flags(child, crypto_ablkcipher_get_flags(parent) & 154 CRYPTO_TFM_REQ_MASK); 155 err = crypto_blkcipher_setkey(child, key, keylen); 156 crypto_ablkcipher_set_flags(parent, crypto_blkcipher_get_flags(child) & 157 CRYPTO_TFM_RES_MASK); 158 return err; 159} 160 161static void cryptd_blkcipher_crypt(struct ablkcipher_request *req, 162 struct crypto_blkcipher *child, 163 int err, 164 int (*crypt)(struct blkcipher_desc *desc, 165 struct scatterlist *dst, 166 struct scatterlist *src, 167 unsigned int len)) 168{ 169 struct cryptd_blkcipher_request_ctx *rctx; 170 struct blkcipher_desc desc; 171 172 rctx = ablkcipher_request_ctx(req); 173 174 if (unlikely(err == -EINPROGRESS)) 175 goto out; 176 177 desc.tfm = child; 178 desc.info = req->info; 179 desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; 180 181 err = crypt(&desc, req->dst, req->src, req->nbytes); 182 183 req->base.complete = rctx->complete; 184 185out: 186 local_bh_disable(); 187 rctx->complete(&req->base, err); 188 local_bh_enable(); 189} 190 191static void cryptd_blkcipher_encrypt(struct crypto_async_request *req, int err) 192{ 193 struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm); 194 struct crypto_blkcipher *child = ctx->child; 195 196 cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err, 197 crypto_blkcipher_crt(child)->encrypt); 198} 199 200static void cryptd_blkcipher_decrypt(struct crypto_async_request *req, int err) 201{ 202 struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(req->tfm); 203 struct crypto_blkcipher *child = ctx->child; 204 205 cryptd_blkcipher_crypt(ablkcipher_request_cast(req), child, err, 206 crypto_blkcipher_crt(child)->decrypt); 207} 208 209static int cryptd_blkcipher_enqueue(struct ablkcipher_request *req, 210 crypto_completion_t complete) 211{ 212 struct cryptd_blkcipher_request_ctx *rctx = ablkcipher_request_ctx(req); 213 struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req); 214 struct cryptd_queue *queue; 215 216 queue = cryptd_get_queue(crypto_ablkcipher_tfm(tfm)); 217 rctx->complete = req->base.complete; 218 req->base.complete = complete; 219 220 return cryptd_enqueue_request(queue, &req->base); 221} 222 223static int cryptd_blkcipher_encrypt_enqueue(struct ablkcipher_request *req) 224{ 225 return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_encrypt); 226} 227 228static int cryptd_blkcipher_decrypt_enqueue(struct ablkcipher_request *req) 229{ 230 return cryptd_blkcipher_enqueue(req, cryptd_blkcipher_decrypt); 231} 232 233static int cryptd_blkcipher_init_tfm(struct crypto_tfm *tfm) 234{ 235 struct crypto_instance *inst = crypto_tfm_alg_instance(tfm); 236 struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst); 237 struct crypto_spawn *spawn = &ictx->spawn; 238 struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm); 239 struct crypto_blkcipher *cipher; 240 241 cipher = crypto_spawn_blkcipher(spawn); 242 if (IS_ERR(cipher)) 243 return PTR_ERR(cipher); 244 245 ctx->child = cipher; 246 tfm->crt_ablkcipher.reqsize = 247 sizeof(struct cryptd_blkcipher_request_ctx); 248 return 0; 249} 250 251static void cryptd_blkcipher_exit_tfm(struct crypto_tfm *tfm) 252{ 253 struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm); 254 255 crypto_free_blkcipher(ctx->child); 256} 257 258static void *cryptd_alloc_instance(struct crypto_alg *alg, unsigned int head, 259 unsigned int tail) 260{ 261 char *p; 262 struct crypto_instance *inst; 263 int err; 264 265 p = kzalloc(head + sizeof(*inst) + tail, GFP_KERNEL); 266 if (!p) 267 return ERR_PTR(-ENOMEM); 268 269 inst = (void *)(p + head); 270 271 err = -ENAMETOOLONG; 272 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, 273 "cryptd(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) 274 goto out_free_inst; 275 276 memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); 277 278 inst->alg.cra_priority = alg->cra_priority + 50; 279 inst->alg.cra_blocksize = alg->cra_blocksize; 280 inst->alg.cra_alignmask = alg->cra_alignmask; 281 282out: 283 return p; 284 285out_free_inst: 286 kfree(p); 287 p = ERR_PTR(err); 288 goto out; 289} 290 291static int cryptd_create_blkcipher(struct crypto_template *tmpl, 292 struct rtattr **tb, 293 struct cryptd_queue *queue) 294{ 295 struct cryptd_instance_ctx *ctx; 296 struct crypto_instance *inst; 297 struct crypto_alg *alg; 298 int err; 299 300 alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_BLKCIPHER, 301 CRYPTO_ALG_TYPE_MASK); 302 if (IS_ERR(alg)) 303 return PTR_ERR(alg); 304 305 inst = cryptd_alloc_instance(alg, 0, sizeof(*ctx)); 306 err = PTR_ERR(inst); 307 if (IS_ERR(inst)) 308 goto out_put_alg; 309 310 ctx = crypto_instance_ctx(inst); 311 ctx->queue = queue; 312 313 err = crypto_init_spawn(&ctx->spawn, alg, inst, 314 CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC); 315 if (err) 316 goto out_free_inst; 317 318 inst->alg.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC; 319 inst->alg.cra_type = &crypto_ablkcipher_type; 320 321 inst->alg.cra_ablkcipher.ivsize = alg->cra_blkcipher.ivsize; 322 inst->alg.cra_ablkcipher.min_keysize = alg->cra_blkcipher.min_keysize; 323 inst->alg.cra_ablkcipher.max_keysize = alg->cra_blkcipher.max_keysize; 324 325 inst->alg.cra_ablkcipher.geniv = alg->cra_blkcipher.geniv; 326 327 inst->alg.cra_ctxsize = sizeof(struct cryptd_blkcipher_ctx); 328 329 inst->alg.cra_init = cryptd_blkcipher_init_tfm; 330 inst->alg.cra_exit = cryptd_blkcipher_exit_tfm; 331 332 inst->alg.cra_ablkcipher.setkey = cryptd_blkcipher_setkey; 333 inst->alg.cra_ablkcipher.encrypt = cryptd_blkcipher_encrypt_enqueue; 334 inst->alg.cra_ablkcipher.decrypt = cryptd_blkcipher_decrypt_enqueue; 335 336 err = crypto_register_instance(tmpl, inst); 337 if (err) { 338 crypto_drop_spawn(&ctx->spawn); 339out_free_inst: 340 kfree(inst); 341 } 342 343out_put_alg: 344 crypto_mod_put(alg); 345 return err; 346} 347 348static int cryptd_hash_init_tfm(struct crypto_tfm *tfm) 349{ 350 struct crypto_instance *inst = crypto_tfm_alg_instance(tfm); 351 struct hashd_instance_ctx *ictx = crypto_instance_ctx(inst); 352 struct crypto_shash_spawn *spawn = &ictx->spawn; 353 struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm); 354 struct crypto_shash *hash; 355 356 hash = crypto_spawn_shash(spawn); 357 if (IS_ERR(hash)) 358 return PTR_ERR(hash); 359 360 ctx->child = hash; 361 crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm), 362 sizeof(struct cryptd_hash_request_ctx) + 363 crypto_shash_descsize(hash)); 364 return 0; 365} 366 367static void cryptd_hash_exit_tfm(struct crypto_tfm *tfm) 368{ 369 struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm); 370 371 crypto_free_shash(ctx->child); 372} 373 374static int cryptd_hash_setkey(struct crypto_ahash *parent, 375 const u8 *key, unsigned int keylen) 376{ 377 struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(parent); 378 struct crypto_shash *child = ctx->child; 379 int err; 380 381 crypto_shash_clear_flags(child, CRYPTO_TFM_REQ_MASK); 382 crypto_shash_set_flags(child, crypto_ahash_get_flags(parent) & 383 CRYPTO_TFM_REQ_MASK); 384 err = crypto_shash_setkey(child, key, keylen); 385 crypto_ahash_set_flags(parent, crypto_shash_get_flags(child) & 386 CRYPTO_TFM_RES_MASK); 387 return err; 388} 389 390static int cryptd_hash_enqueue(struct ahash_request *req, 391 crypto_completion_t complete) 392{ 393 struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); 394 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); 395 struct cryptd_queue *queue = 396 cryptd_get_queue(crypto_ahash_tfm(tfm)); 397 398 rctx->complete = req->base.complete; 399 req->base.complete = complete; 400 401 return cryptd_enqueue_request(queue, &req->base); 402} 403 404static void cryptd_hash_init(struct crypto_async_request *req_async, int err) 405{ 406 struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm); 407 struct crypto_shash *child = ctx->child; 408 struct ahash_request *req = ahash_request_cast(req_async); 409 struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); 410 struct shash_desc *desc = &rctx->desc; 411 412 if (unlikely(err == -EINPROGRESS)) 413 goto out; 414 415 desc->tfm = child; 416 desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; 417 418 err = crypto_shash_init(desc); 419 420 req->base.complete = rctx->complete; 421 422out: 423 local_bh_disable(); 424 rctx->complete(&req->base, err); 425 local_bh_enable(); 426} 427 428static int cryptd_hash_init_enqueue(struct ahash_request *req) 429{ 430 return cryptd_hash_enqueue(req, cryptd_hash_init); 431} 432 433static void cryptd_hash_update(struct crypto_async_request *req_async, int err) 434{ 435 struct ahash_request *req = ahash_request_cast(req_async); 436 struct cryptd_hash_request_ctx *rctx; 437 438 rctx = ahash_request_ctx(req); 439 440 if (unlikely(err == -EINPROGRESS)) 441 goto out; 442 443 err = shash_ahash_update(req, &rctx->desc); 444 445 req->base.complete = rctx->complete; 446 447out: 448 local_bh_disable(); 449 rctx->complete(&req->base, err); 450 local_bh_enable(); 451} 452 453static int cryptd_hash_update_enqueue(struct ahash_request *req) 454{ 455 return cryptd_hash_enqueue(req, cryptd_hash_update); 456} 457 458static void cryptd_hash_final(struct crypto_async_request *req_async, int err) 459{ 460 struct ahash_request *req = ahash_request_cast(req_async); 461 struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); 462 463 if (unlikely(err == -EINPROGRESS)) 464 goto out; 465 466 err = crypto_shash_final(&rctx->desc, req->result); 467 468 req->base.complete = rctx->complete; 469 470out: 471 local_bh_disable(); 472 rctx->complete(&req->base, err); 473 local_bh_enable(); 474} 475 476static int cryptd_hash_final_enqueue(struct ahash_request *req) 477{ 478 return cryptd_hash_enqueue(req, cryptd_hash_final); 479} 480 481static void cryptd_hash_finup(struct crypto_async_request *req_async, int err) 482{ 483 struct ahash_request *req = ahash_request_cast(req_async); 484 struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); 485 486 if (unlikely(err == -EINPROGRESS)) 487 goto out; 488 489 err = shash_ahash_finup(req, &rctx->desc); 490 491 req->base.complete = rctx->complete; 492 493out: 494 local_bh_disable(); 495 rctx->complete(&req->base, err); 496 local_bh_enable(); 497} 498 499static int cryptd_hash_finup_enqueue(struct ahash_request *req) 500{ 501 return cryptd_hash_enqueue(req, cryptd_hash_finup); 502} 503 504static void cryptd_hash_digest(struct crypto_async_request *req_async, int err) 505{ 506 struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm); 507 struct crypto_shash *child = ctx->child; 508 struct ahash_request *req = ahash_request_cast(req_async); 509 struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); 510 struct shash_desc *desc = &rctx->desc; 511 512 if (unlikely(err == -EINPROGRESS)) 513 goto out; 514 515 desc->tfm = child; 516 desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; 517 518 err = shash_ahash_digest(req, desc); 519 520 req->base.complete = rctx->complete; 521 522out: 523 local_bh_disable(); 524 rctx->complete(&req->base, err); 525 local_bh_enable(); 526} 527 528static int cryptd_hash_digest_enqueue(struct ahash_request *req) 529{ 530 return cryptd_hash_enqueue(req, cryptd_hash_digest); 531} 532 533static int cryptd_hash_export(struct ahash_request *req, void *out) 534{ 535 struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); 536 537 return crypto_shash_export(&rctx->desc, out); 538} 539 540static int cryptd_hash_import(struct ahash_request *req, const void *in) 541{ 542 struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); 543 544 return crypto_shash_import(&rctx->desc, in); 545} 546 547static int cryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb, 548 struct cryptd_queue *queue) 549{ 550 struct hashd_instance_ctx *ctx; 551 struct ahash_instance *inst; 552 struct shash_alg *salg; 553 struct crypto_alg *alg; 554 int err; 555 556 salg = shash_attr_alg(tb[1], 0, 0); 557 if (IS_ERR(salg)) 558 return PTR_ERR(salg); 559 560 alg = &salg->base; 561 inst = cryptd_alloc_instance(alg, ahash_instance_headroom(), 562 sizeof(*ctx)); 563 err = PTR_ERR(inst); 564 if (IS_ERR(inst)) 565 goto out_put_alg; 566 567 ctx = ahash_instance_ctx(inst); 568 ctx->queue = queue; 569 570 err = crypto_init_shash_spawn(&ctx->spawn, salg, 571 ahash_crypto_instance(inst)); 572 if (err) 573 goto out_free_inst; 574 575 inst->alg.halg.base.cra_flags = CRYPTO_ALG_ASYNC; 576 577 inst->alg.halg.digestsize = salg->digestsize; 578 inst->alg.halg.base.cra_ctxsize = sizeof(struct cryptd_hash_ctx); 579 580 inst->alg.halg.base.cra_init = cryptd_hash_init_tfm; 581 inst->alg.halg.base.cra_exit = cryptd_hash_exit_tfm; 582 583 inst->alg.init = cryptd_hash_init_enqueue; 584 inst->alg.update = cryptd_hash_update_enqueue; 585 inst->alg.final = cryptd_hash_final_enqueue; 586 inst->alg.finup = cryptd_hash_finup_enqueue; 587 inst->alg.export = cryptd_hash_export; 588 inst->alg.import = cryptd_hash_import; 589 inst->alg.setkey = cryptd_hash_setkey; 590 inst->alg.digest = cryptd_hash_digest_enqueue; 591 592 err = ahash_register_instance(tmpl, inst); 593 if (err) { 594 crypto_drop_shash(&ctx->spawn); 595out_free_inst: 596 kfree(inst); 597 } 598 599out_put_alg: 600 crypto_mod_put(alg); 601 return err; 602} 603 604static struct cryptd_queue queue; 605 606static int cryptd_create(struct crypto_template *tmpl, struct rtattr **tb) 607{ 608 struct crypto_attr_type *algt; 609 610 algt = crypto_get_attr_type(tb); 611 if (IS_ERR(algt)) 612 return PTR_ERR(algt); 613 614 switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) { 615 case CRYPTO_ALG_TYPE_BLKCIPHER: 616 return cryptd_create_blkcipher(tmpl, tb, &queue); 617 case CRYPTO_ALG_TYPE_DIGEST: 618 return cryptd_create_hash(tmpl, tb, &queue); 619 } 620 621 return -EINVAL; 622} 623 624static void cryptd_free(struct crypto_instance *inst) 625{ 626 struct cryptd_instance_ctx *ctx = crypto_instance_ctx(inst); 627 struct hashd_instance_ctx *hctx = crypto_instance_ctx(inst); 628 629 switch (inst->alg.cra_flags & CRYPTO_ALG_TYPE_MASK) { 630 case CRYPTO_ALG_TYPE_AHASH: 631 crypto_drop_shash(&hctx->spawn); 632 kfree(ahash_instance(inst)); 633 return; 634 } 635 636 crypto_drop_spawn(&ctx->spawn); 637 kfree(inst); 638} 639 640static struct crypto_template cryptd_tmpl = { 641 .name = "cryptd", 642 .create = cryptd_create, 643 .free = cryptd_free, 644 .module = THIS_MODULE, 645}; 646 647struct cryptd_ablkcipher *cryptd_alloc_ablkcipher(const char *alg_name, 648 u32 type, u32 mask) 649{ 650 char cryptd_alg_name[CRYPTO_MAX_ALG_NAME]; 651 struct crypto_tfm *tfm; 652 653 if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME, 654 "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME) 655 return ERR_PTR(-EINVAL); 656 type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV); 657 type |= CRYPTO_ALG_TYPE_BLKCIPHER; 658 mask &= ~CRYPTO_ALG_TYPE_MASK; 659 mask |= (CRYPTO_ALG_GENIV | CRYPTO_ALG_TYPE_BLKCIPHER_MASK); 660 tfm = crypto_alloc_base(cryptd_alg_name, type, mask); 661 if (IS_ERR(tfm)) 662 return ERR_CAST(tfm); 663 if (tfm->__crt_alg->cra_module != THIS_MODULE) { 664 crypto_free_tfm(tfm); 665 return ERR_PTR(-EINVAL); 666 } 667 668 return __cryptd_ablkcipher_cast(__crypto_ablkcipher_cast(tfm)); 669} 670EXPORT_SYMBOL_GPL(cryptd_alloc_ablkcipher); 671 672struct crypto_blkcipher *cryptd_ablkcipher_child(struct cryptd_ablkcipher *tfm) 673{ 674 struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(&tfm->base); 675 return ctx->child; 676} 677EXPORT_SYMBOL_GPL(cryptd_ablkcipher_child); 678 679void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm) 680{ 681 crypto_free_ablkcipher(&tfm->base); 682} 683EXPORT_SYMBOL_GPL(cryptd_free_ablkcipher); 684 685struct cryptd_ahash *cryptd_alloc_ahash(const char *alg_name, 686 u32 type, u32 mask) 687{ 688 char cryptd_alg_name[CRYPTO_MAX_ALG_NAME]; 689 struct crypto_ahash *tfm; 690 691 if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME, 692 "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME) 693 return ERR_PTR(-EINVAL); 694 tfm = crypto_alloc_ahash(cryptd_alg_name, type, mask); 695 if (IS_ERR(tfm)) 696 return ERR_CAST(tfm); 697 if (tfm->base.__crt_alg->cra_module != THIS_MODULE) { 698 crypto_free_ahash(tfm); 699 return ERR_PTR(-EINVAL); 700 } 701 702 return __cryptd_ahash_cast(tfm); 703} 704EXPORT_SYMBOL_GPL(cryptd_alloc_ahash); 705 706struct crypto_shash *cryptd_ahash_child(struct cryptd_ahash *tfm) 707{ 708 struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base); 709 710 return ctx->child; 711} 712EXPORT_SYMBOL_GPL(cryptd_ahash_child); 713 714struct shash_desc *cryptd_shash_desc(struct ahash_request *req) 715{ 716 struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req); 717 return &rctx->desc; 718} 719EXPORT_SYMBOL_GPL(cryptd_shash_desc); 720 721void cryptd_free_ahash(struct cryptd_ahash *tfm) 722{ 723 crypto_free_ahash(&tfm->base); 724} 725EXPORT_SYMBOL_GPL(cryptd_free_ahash); 726 727static int __init cryptd_init(void) 728{ 729 int err; 730 731 err = cryptd_init_queue(&queue, CRYPTD_MAX_CPU_QLEN); 732 if (err) 733 return err; 734 735 err = crypto_register_template(&cryptd_tmpl); 736 if (err) 737 cryptd_fini_queue(&queue); 738 739 return err; 740} 741 742static void __exit cryptd_exit(void) 743{ 744 cryptd_fini_queue(&queue); 745 crypto_unregister_template(&cryptd_tmpl); 746} 747 748module_init(cryptd_init); 749module_exit(cryptd_exit); 750 751MODULE_LICENSE("GPL"); 752MODULE_DESCRIPTION("Software async crypto daemon"); 753