crypto/ahash.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Asynchronous Cryptographic Hash operations.
   4  *
   5  * This is the asynchronous version of hash.c with notification of
   6  * completion via a callback.
   7  *
   8  * Copyright (c) 2008 Loc Ho <lho@amcc.com>
   9  */
  10
  11 #include <crypto/internal/hash.h>
  12 #include <crypto/scatterwalk.h>
  13 #include <linux/bug.h>
  14 #include <linux/err.h>
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/sched.h>
  18 #include <linux/slab.h>
  19 #include <linux/seq_file.h>
  20 #include <linux/cryptouser.h>
  21 #include <linux/compiler.h>
  22 #include <net/netlink.h>
  23
  24 #include "internal.h"
  25
  26 static const struct crypto_type crypto_ahash_type;
  27
  28 struct ahash_request_priv {
  29         crypto_completion_t complete;
  30         void *data;
  31         u8 *result;
  32         u32 flags;
  33         void *ubuf[] CRYPTO_MINALIGN_ATTR;
  34 };
  35
  36 static inline struct ahash_alg *crypto_ahash_alg(struct crypto_ahash *hash)
  37 {
  38         return container_of(crypto_hash_alg_common(hash), struct ahash_alg,
  39                             halg);
  40 }
  41
  42 static int hash_walk_next(struct crypto_hash_walk *walk)
  43 {
  44         unsigned int alignmask = walk->alignmask;
  45         unsigned int offset = walk->offset;
  46         unsigned int nbytes = min(walk->entrylen,
  47                                   ((unsigned int)(PAGE_SIZE)) - offset);
  48
  49         if (walk->flags & CRYPTO_ALG_ASYNC)
  50                 walk->data = kmap(walk->pg);
  51         else
  52                 walk->data = kmap_atomic(walk->pg);
  53         walk->data += offset;
  54
  55         if (offset & alignmask) {
  56                 unsigned int unaligned = alignmask + 1 - (offset & alignmask);
  57
  58                 if (nbytes > unaligned)
  59                         nbytes = unaligned;
  60         }
  61
  62         walk->entrylen -= nbytes;
  63         return nbytes;
  64 }
  65
  66 static int hash_walk_new_entry(struct crypto_hash_walk *walk)
  67 {
  68         struct scatterlist *sg;
  69
  70         sg = walk->sg;
  71         walk->offset = sg->offset;
  72         walk->pg = sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
  73         walk->offset = offset_in_page(walk->offset);
  74         walk->entrylen = sg->length;
  75
  76         if (walk->entrylen > walk->total)
  77                 walk->entrylen = walk->total;
  78         walk->total -= walk->entrylen;
  79
  80         return hash_walk_next(walk);
  81 }
  82
  83 int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
  84 {
  85         unsigned int alignmask = walk->alignmask;
  86
  87         walk->data -= walk->offset;
  88
  89         if (walk->entrylen && (walk->offset & alignmask) && !err) {
  90                 unsigned int nbytes;
  91
  92                 walk->offset = ALIGN(walk->offset, alignmask + 1);
  93                 nbytes = min(walk->entrylen,
  94                              (unsigned int)(PAGE_SIZE - walk->offset));
  95                 if (nbytes) {
  96                         walk->entrylen -= nbytes;
  97                         walk->data += walk->offset;
  98                         return nbytes;
  99                 }
 100         }
 101
 102         if (walk->flags & CRYPTO_ALG_ASYNC)
 103                 kunmap(walk->pg);
 104         else {
 105                 kunmap_atomic(walk->data);
 106                 /*
 107                  * The may sleep test only makes sense for sync users.
 108                  * Async users don't need to sleep here anyway.
 109                  */
 110                 crypto_yield(walk->flags);
 111         }
 112
 113         if (err)
 114                 return err;
 115
 116         if (walk->entrylen) {
 117                 walk->offset = 0;
 118                 walk->pg++;
 119                 return hash_walk_next(walk);
 120         }
 121
 122         if (!walk->total)
 123                 return 0;
 124
 125         walk->sg = sg_next(walk->sg);
 126
 127         return hash_walk_new_entry(walk);
 128 }
 129 EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
 130
 131 int crypto_hash_walk_first(struct ahash_request *req,
 132                            struct crypto_hash_walk *walk)
 133 {
 134         walk->total = req->nbytes;
 135
 136         if (!walk->total) {
 137                 walk->entrylen = 0;
 138                 return 0;
 139         }
 140
 141         walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
 142         walk->sg = req->src;
 143         walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK;
 144
 145         return hash_walk_new_entry(walk);
 146 }
 147 EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
 148
 149 int crypto_ahash_walk_first(struct ahash_request *req,
 150                             struct crypto_hash_walk *walk)
 151 {
 152         walk->total = req->nbytes;
 153
 154         if (!walk->total) {
 155                 walk->entrylen = 0;
 156                 return 0;
 157         }
 158
 159         walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
 160         walk->sg = req->src;
 161         walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK;
 162         walk->flags |= CRYPTO_ALG_ASYNC;
 163
 164         BUILD_BUG_ON(CRYPTO_TFM_REQ_MASK & CRYPTO_ALG_ASYNC);
 165
 166         return hash_walk_new_entry(walk);
 167 }
 168 EXPORT_SYMBOL_GPL(crypto_ahash_walk_first);
 169
 170 static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
 171                                 unsigned int keylen)
 172 {
 173         unsigned long alignmask = crypto_ahash_alignmask(tfm);
 174         int ret;
 175         u8 *buffer, *alignbuffer;
 176         unsigned long absize;
 177
 178         absize = keylen + alignmask;
 179         buffer = kmalloc(absize, GFP_KERNEL);
 180         if (!buffer)
 181                 return -ENOMEM;
 182
 183         alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
 184         memcpy(alignbuffer, key, keylen);
 185         ret = tfm->setkey(tfm, alignbuffer, keylen);
 186         kzfree(buffer);
 187         return ret;
 188 }
 189
 190 static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
 191                           unsigned int keylen)
 192 {
 193         return -ENOSYS;
 194 }
 195
 196 static void ahash_set_needkey(struct crypto_ahash *tfm)
 197 {
 198         const struct hash_alg_common *alg = crypto_hash_alg_common(tfm);
 199
 200         if (tfm->setkey != ahash_nosetkey &&
 201             !(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
 202                 crypto_ahash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
 203 }
 204
 205 int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
 206                         unsigned int keylen)
 207 {
 208         unsigned long alignmask = crypto_ahash_alignmask(tfm);
 209         int err;
 210
 211         if ((unsigned long)key & alignmask)
 212                 err = ahash_setkey_unaligned(tfm, key, keylen);
 213         else
 214                 err = tfm->setkey(tfm, key, keylen);
 215
 216         if (unlikely(err)) {
 217                 ahash_set_needkey(tfm);
 218                 return err;
 219         }
 220
 221         crypto_ahash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
 222         return 0;
 223 }
 224 EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
 225
 226 static inline unsigned int ahash_align_buffer_size(unsigned len,
 227                                                    unsigned long mask)
 228 {
 229         return len + (mask & ~(crypto_tfm_ctx_alignment() - 1));
 230 }
 231
 232 static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt)
 233 {
 234         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 235         unsigned long alignmask = crypto_ahash_alignmask(tfm);
 236         unsigned int ds = crypto_ahash_digestsize(tfm);
 237         struct ahash_request_priv *priv;
 238
 239         priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
 240                        (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
 241                        GFP_KERNEL : GFP_ATOMIC);
 242         if (!priv)
 243                 return -ENOMEM;
 244
 245         /*
 246          * WARNING: Voodoo programming below!
 247          *
 248          * The code below is obscure and hard to understand, thus explanation
 249          * is necessary. See include/crypto/hash.h and include/linux/crypto.h
 250          * to understand the layout of structures used here!
 251          *
 252          * The code here will replace portions of the ORIGINAL request with
 253          * pointers to new code and buffers so the hashing operation can store
 254          * the result in aligned buffer. We will call the modified request
 255          * an ADJUSTED request.
 256          *
 257          * The newly mangled request will look as such:
 258          *
 259          * req {
 260          *   .result        = ADJUSTED[new aligned buffer]
 261          *   .base.complete = ADJUSTED[pointer to completion function]
 262          *   .base.data     = ADJUSTED[*req (pointer to self)]
 263          *   .priv          = ADJUSTED[new priv] {
 264          *           .result   = ORIGINAL(result)
 265          *           .complete = ORIGINAL(base.complete)
 266          *           .data     = ORIGINAL(base.data)
 267          *   }
 268          */
 269
 270         priv->result = req->result;
 271         priv->complete = req->base.complete;
 272         priv->data = req->base.data;
 273         priv->flags = req->base.flags;
 274
 275         /*
 276          * WARNING: We do not backup req->priv here! The req->priv
 277          *          is for internal use of the Crypto API and the
 278          *          user must _NOT_ _EVER_ depend on it's content!
 279          */
 280
 281         req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
 282         req->base.complete = cplt;
 283         req->base.data = req;
 284         req->priv = priv;
 285
 286         return 0;
 287 }
 288
 289 static void ahash_restore_req(struct ahash_request *req, int err)
 290 {
 291         struct ahash_request_priv *priv = req->priv;
 292
 293         if (!err)
 294                 memcpy(priv->result, req->result,
 295                        crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
 296
 297         /* Restore the original crypto request. */
 298         req->result = priv->result;
 299
 300         ahash_request_set_callback(req, priv->flags,
 301                                    priv->complete, priv->data);
 302         req->priv = NULL;
 303
 304         /* Free the req->priv.priv from the ADJUSTED request. */
 305         kzfree(priv);
 306 }
 307
 308 static void ahash_notify_einprogress(struct ahash_request *req)
 309 {
 310         struct ahash_request_priv *priv = req->priv;
 311         struct crypto_async_request oreq;
 312
 313         oreq.data = priv->data;
 314
 315         priv->complete(&oreq, -EINPROGRESS);
 316 }
 317
 318 static void ahash_op_unaligned_done(struct crypto_async_request *req, int err)
 319 {
 320         struct ahash_request *areq = req->data;
 321
 322         if (err == -EINPROGRESS) {
 323                 ahash_notify_einprogress(areq);
 324                 return;
 325         }
 326
 327         /*
 328          * Restore the original request, see ahash_op_unaligned() for what
 329          * goes where.
 330          *
 331          * The "struct ahash_request *req" here is in fact the "req.base"
 332          * from the ADJUSTED request from ahash_op_unaligned(), thus as it
 333          * is a pointer to self, it is also the ADJUSTED "req" .
 334          */
 335
 336         /* First copy req->result into req->priv.result */
 337         ahash_restore_req(areq, err);
 338
 339         /* Complete the ORIGINAL request. */
 340         areq->base.complete(&areq->base, err);
 341 }
 342
 343 static int ahash_op_unaligned(struct ahash_request *req,
 344                               int (*op)(struct ahash_request *))
 345 {
 346         int err;
 347
 348         err = ahash_save_req(req, ahash_op_unaligned_done);
 349         if (err)
 350                 return err;
 351
 352         err = op(req);
 353         if (err == -EINPROGRESS || err == -EBUSY)
 354                 return err;
 355
 356         ahash_restore_req(req, err);
 357
 358         return err;
 359 }
 360
 361 static int crypto_ahash_op(struct ahash_request *req,
 362                            int (*op)(struct ahash_request *))
 363 {
 364         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 365         unsigned long alignmask = crypto_ahash_alignmask(tfm);
 366
 367         if ((unsigned long)req->result & alignmask)
 368                 return ahash_op_unaligned(req, op);
 369
 370         return op(req);
 371 }
 372
 373 int crypto_ahash_final(struct ahash_request *req)
 374 {
 375         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 376         struct crypto_alg *alg = tfm->base.__crt_alg;
 377         unsigned int nbytes = req->nbytes;
 378         int ret;
 379
 380         crypto_stats_get(alg);
 381         ret = crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
 382         crypto_stats_ahash_final(nbytes, ret, alg);
 383         return ret;
 384 }
 385 EXPORT_SYMBOL_GPL(crypto_ahash_final);
 386
 387 int crypto_ahash_finup(struct ahash_request *req)
 388 {
 389         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 390         struct crypto_alg *alg = tfm->base.__crt_alg;
 391         unsigned int nbytes = req->nbytes;
 392         int ret;
 393
 394         crypto_stats_get(alg);
 395         ret = crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
 396         crypto_stats_ahash_final(nbytes, ret, alg);
 397         return ret;
 398 }
 399 EXPORT_SYMBOL_GPL(crypto_ahash_finup);
 400
 401 int crypto_ahash_digest(struct ahash_request *req)
 402 {
 403         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 404         struct crypto_alg *alg = tfm->base.__crt_alg;
 405         unsigned int nbytes = req->nbytes;
 406         int ret;
 407
 408         crypto_stats_get(alg);
 409         if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
 410                 ret = -ENOKEY;
 411         else
 412                 ret = crypto_ahash_op(req, tfm->digest);
 413         crypto_stats_ahash_final(nbytes, ret, alg);
 414         return ret;
 415 }
 416 EXPORT_SYMBOL_GPL(crypto_ahash_digest);
 417
 418 static void ahash_def_finup_done2(struct crypto_async_request *req, int err)
 419 {
 420         struct ahash_request *areq = req->data;
 421
 422         if (err == -EINPROGRESS)
 423                 return;
 424
 425         ahash_restore_req(areq, err);
 426
 427         areq->base.complete(&areq->base, err);
 428 }
 429
 430 static int ahash_def_finup_finish1(struct ahash_request *req, int err)
 431 {
 432         if (err)
 433                 goto out;
 434
 435         req->base.complete = ahash_def_finup_done2;
 436
 437         err = crypto_ahash_reqtfm(req)->final(req);
 438         if (err == -EINPROGRESS || err == -EBUSY)
 439                 return err;
 440
 441 out:
 442         ahash_restore_req(req, err);
 443         return err;
 444 }
 445
 446 static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
 447 {
 448         struct ahash_request *areq = req->data;
 449
 450         if (err == -EINPROGRESS) {
 451                 ahash_notify_einprogress(areq);
 452                 return;
 453         }
 454
 455         areq->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 456
 457         err = ahash_def_finup_finish1(areq, err);
 458         if (areq->priv)
 459                 return;
 460
 461         areq->base.complete(&areq->base, err);
 462 }
 463
 464 static int ahash_def_finup(struct ahash_request *req)
 465 {
 466         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 467         int err;
 468
 469         err = ahash_save_req(req, ahash_def_finup_done1);
 470         if (err)
 471                 return err;
 472
 473         err = tfm->update(req);
 474         if (err == -EINPROGRESS || err == -EBUSY)
 475                 return err;
 476
 477         return ahash_def_finup_finish1(req, err);
 478 }
 479
 480 static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
 481 {
 482         struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
 483         struct ahash_alg *alg = crypto_ahash_alg(hash);
 484
 485         hash->setkey = ahash_nosetkey;
 486
 487         if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
 488                 return crypto_init_shash_ops_async(tfm);
 489
 490         hash->init = alg->init;
 491         hash->update = alg->update;
 492         hash->final = alg->final;
 493         hash->finup = alg->finup ?: ahash_def_finup;
 494         hash->digest = alg->digest;
 495         hash->export = alg->export;
 496         hash->import = alg->import;
 497
 498         if (alg->setkey) {
 499                 hash->setkey = alg->setkey;
 500                 ahash_set_needkey(hash);
 501         }
 502
 503         return 0;
 504 }
 505
 506 static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
 507 {
 508         if (alg->cra_type != &crypto_ahash_type)
 509                 return sizeof(struct crypto_shash *);
 510
 511         return crypto_alg_extsize(alg);
 512 }
 513
 514 static void crypto_ahash_free_instance(struct crypto_instance *inst)
 515 {
 516         struct ahash_instance *ahash = ahash_instance(inst);
 517
 518         ahash->free(ahash);
 519 }
 520
 521 #ifdef CONFIG_NET
 522 static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
 523 {
 524         struct crypto_report_hash rhash;
 525
 526         memset(&rhash, 0, sizeof(rhash));
 527
 528         strscpy(rhash.type, "ahash", sizeof(rhash.type));
 529
 530         rhash.blocksize = alg->cra_blocksize;
 531         rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
 532
 533         return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
 534 }
 535 #else
 536 static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
 537 {
 538         return -ENOSYS;
 539 }
 540 #endif
 541
 542 static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
 543         __maybe_unused;
 544 static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
 545 {
 546         seq_printf(m, "type         : ahash\n");
 547         seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
 548                                              "yes" : "no");
 549         seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
 550         seq_printf(m, "digestsize   : %u\n",
 551                    __crypto_hash_alg_common(alg)->digestsize);
 552 }
 553
 554 static const struct crypto_type crypto_ahash_type = {
 555         .extsize = crypto_ahash_extsize,
 556         .init_tfm = crypto_ahash_init_tfm,
 557         .free = crypto_ahash_free_instance,
 558 #ifdef CONFIG_PROC_FS
 559         .show = crypto_ahash_show,
 560 #endif
 561         .report = crypto_ahash_report,
 562         .maskclear = ~CRYPTO_ALG_TYPE_MASK,
 563         .maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
 564         .type = CRYPTO_ALG_TYPE_AHASH,
 565         .tfmsize = offsetof(struct crypto_ahash, base),
 566 };
 567
 568 int crypto_grab_ahash(struct crypto_ahash_spawn *spawn,
 569                       struct crypto_instance *inst,
 570                       const char *name, u32 type, u32 mask)
 571 {
 572         spawn->base.frontend = &crypto_ahash_type;
 573         return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
 574 }
 575 EXPORT_SYMBOL_GPL(crypto_grab_ahash);
 576
 577 struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
 578                                         u32 mask)
 579 {
 580         return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
 581 }
 582 EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
 583
 584 int crypto_has_ahash(const char *alg_name, u32 type, u32 mask)
 585 {
 586         return crypto_type_has_alg(alg_name, &crypto_ahash_type, type, mask);
 587 }
 588 EXPORT_SYMBOL_GPL(crypto_has_ahash);
 589
 590 static int ahash_prepare_alg(struct ahash_alg *alg)
 591 {
 592         struct crypto_alg *base = &alg->halg.base;
 593
 594         if (alg->halg.digestsize > HASH_MAX_DIGESTSIZE ||
 595             alg->halg.statesize > HASH_MAX_STATESIZE ||
 596             alg->halg.statesize == 0)
 597                 return -EINVAL;
 598
 599         base->cra_type = &crypto_ahash_type;
 600         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
 601         base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
 602
 603         return 0;
 604 }
 605
 606 int crypto_register_ahash(struct ahash_alg *alg)
 607 {
 608         struct crypto_alg *base = &alg->halg.base;
 609         int err;
 610
 611         err = ahash_prepare_alg(alg);
 612         if (err)
 613                 return err;
 614
 615         return crypto_register_alg(base);
 616 }
 617 EXPORT_SYMBOL_GPL(crypto_register_ahash);
 618
 619 void crypto_unregister_ahash(struct ahash_alg *alg)
 620 {
 621         crypto_unregister_alg(&alg->halg.base);
 622 }
 623 EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
 624
 625 int crypto_register_ahashes(struct ahash_alg *algs, int count)
 626 {
 627         int i, ret;
 628
 629         for (i = 0; i < count; i++) {
 630                 ret = crypto_register_ahash(&algs[i]);
 631                 if (ret)
 632                         goto err;
 633         }
 634
 635         return 0;
 636
 637 err:
 638         for (--i; i >= 0; --i)
 639                 crypto_unregister_ahash(&algs[i]);
 640
 641         return ret;
 642 }
 643 EXPORT_SYMBOL_GPL(crypto_register_ahashes);
 644
 645 void crypto_unregister_ahashes(struct ahash_alg *algs, int count)
 646 {
 647         int i;
 648
 649         for (i = count - 1; i >= 0; --i)
 650                 crypto_unregister_ahash(&algs[i]);
 651 }
 652 EXPORT_SYMBOL_GPL(crypto_unregister_ahashes);
 653
 654 int ahash_register_instance(struct crypto_template *tmpl,
 655                             struct ahash_instance *inst)
 656 {
 657         int err;
 658
 659         if (WARN_ON(!inst->free))
 660                 return -EINVAL;
 661
 662         err = ahash_prepare_alg(&inst->alg);
 663         if (err)
 664                 return err;
 665
 666         return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
 667 }
 668 EXPORT_SYMBOL_GPL(ahash_register_instance);
 669
 670 bool crypto_hash_alg_has_setkey(struct hash_alg_common *halg)
 671 {
 672         struct crypto_alg *alg = &halg->base;
 673
 674         if (alg->cra_type != &crypto_ahash_type)
 675                 return crypto_shash_alg_has_setkey(__crypto_shash_alg(alg));
 676
 677         return __crypto_ahash_alg(alg)->setkey != NULL;
 678 }
 679 EXPORT_SYMBOL_GPL(crypto_hash_alg_has_setkey);
 680
 681 MODULE_LICENSE("GPL");
 682 MODULE_DESCRIPTION("Asynchronous cryptographic hash type");