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/scatterwalk.h>
  12 #include <linux/cryptouser.h>
  13 #include <linux/err.h>
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/sched.h>
  17 #include <linux/slab.h>
  18 #include <linux/seq_file.h>
  19 #include <linux/string.h>
  20 #include <net/netlink.h>
  21
  22 #include "hash.h"
  23
  24 static const struct crypto_type crypto_ahash_type;
  25
  26 struct ahash_request_priv {
  27         crypto_completion_t complete;
  28         void *data;
  29         u8 *result;
  30         u32 flags;
  31         void *ubuf[] CRYPTO_MINALIGN_ATTR;
  32 };
  33
  34 static int hash_walk_next(struct crypto_hash_walk *walk)
  35 {
  36         unsigned int alignmask = walk->alignmask;
  37         unsigned int offset = walk->offset;
  38         unsigned int nbytes = min(walk->entrylen,
  39                                   ((unsigned int)(PAGE_SIZE)) - offset);
  40
  41         walk->data = kmap_local_page(walk->pg);
  42         walk->data += offset;
  43
  44         if (offset & alignmask) {
  45                 unsigned int unaligned = alignmask + 1 - (offset & alignmask);
  46
  47                 if (nbytes > unaligned)
  48                         nbytes = unaligned;
  49         }
  50
  51         walk->entrylen -= nbytes;
  52         return nbytes;
  53 }
  54
  55 static int hash_walk_new_entry(struct crypto_hash_walk *walk)
  56 {
  57         struct scatterlist *sg;
  58
  59         sg = walk->sg;
  60         walk->offset = sg->offset;
  61         walk->pg = sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
  62         walk->offset = offset_in_page(walk->offset);
  63         walk->entrylen = sg->length;
  64
  65         if (walk->entrylen > walk->total)
  66                 walk->entrylen = walk->total;
  67         walk->total -= walk->entrylen;
  68
  69         return hash_walk_next(walk);
  70 }
  71
  72 int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
  73 {
  74         unsigned int alignmask = walk->alignmask;
  75
  76         walk->data -= walk->offset;
  77
  78         if (walk->entrylen && (walk->offset & alignmask) && !err) {
  79                 unsigned int nbytes;
  80
  81                 walk->offset = ALIGN(walk->offset, alignmask + 1);
  82                 nbytes = min(walk->entrylen,
  83                              (unsigned int)(PAGE_SIZE - walk->offset));
  84                 if (nbytes) {
  85                         walk->entrylen -= nbytes;
  86                         walk->data += walk->offset;
  87                         return nbytes;
  88                 }
  89         }
  90
  91         kunmap_local(walk->data);
  92         crypto_yield(walk->flags);
  93
  94         if (err)
  95                 return err;
  96
  97         if (walk->entrylen) {
  98                 walk->offset = 0;
  99                 walk->pg++;
 100                 return hash_walk_next(walk);
 101         }
 102
 103         if (!walk->total)
 104                 return 0;
 105
 106         walk->sg = sg_next(walk->sg);
 107
 108         return hash_walk_new_entry(walk);
 109 }
 110 EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
 111
 112 int crypto_hash_walk_first(struct ahash_request *req,
 113                            struct crypto_hash_walk *walk)
 114 {
 115         walk->total = req->nbytes;
 116
 117         if (!walk->total) {
 118                 walk->entrylen = 0;
 119                 return 0;
 120         }
 121
 122         walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
 123         walk->sg = req->src;
 124         walk->flags = req->base.flags;
 125
 126         return hash_walk_new_entry(walk);
 127 }
 128 EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
 129
 130 static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
 131                                 unsigned int keylen)
 132 {
 133         unsigned long alignmask = crypto_ahash_alignmask(tfm);
 134         int ret;
 135         u8 *buffer, *alignbuffer;
 136         unsigned long absize;
 137
 138         absize = keylen + alignmask;
 139         buffer = kmalloc(absize, GFP_KERNEL);
 140         if (!buffer)
 141                 return -ENOMEM;
 142
 143         alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
 144         memcpy(alignbuffer, key, keylen);
 145         ret = tfm->setkey(tfm, alignbuffer, keylen);
 146         kfree_sensitive(buffer);
 147         return ret;
 148 }
 149
 150 static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
 151                           unsigned int keylen)
 152 {
 153         return -ENOSYS;
 154 }
 155
 156 static void ahash_set_needkey(struct crypto_ahash *tfm)
 157 {
 158         const struct hash_alg_common *alg = crypto_hash_alg_common(tfm);
 159
 160         if (tfm->setkey != ahash_nosetkey &&
 161             !(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
 162                 crypto_ahash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
 163 }
 164
 165 int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
 166                         unsigned int keylen)
 167 {
 168         unsigned long alignmask = crypto_ahash_alignmask(tfm);
 169         int err;
 170
 171         if ((unsigned long)key & alignmask)
 172                 err = ahash_setkey_unaligned(tfm, key, keylen);
 173         else
 174                 err = tfm->setkey(tfm, key, keylen);
 175
 176         if (unlikely(err)) {
 177                 ahash_set_needkey(tfm);
 178                 return err;
 179         }
 180
 181         crypto_ahash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
 182         return 0;
 183 }
 184 EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
 185
 186 static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt,
 187                           bool has_state)
 188 {
 189         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 190         unsigned long alignmask = crypto_ahash_alignmask(tfm);
 191         unsigned int ds = crypto_ahash_digestsize(tfm);
 192         struct ahash_request *subreq;
 193         unsigned int subreq_size;
 194         unsigned int reqsize;
 195         u8 *result;
 196         gfp_t gfp;
 197         u32 flags;
 198
 199         subreq_size = sizeof(*subreq);
 200         reqsize = crypto_ahash_reqsize(tfm);
 201         reqsize = ALIGN(reqsize, crypto_tfm_ctx_alignment());
 202         subreq_size += reqsize;
 203         subreq_size += ds;
 204         subreq_size += alignmask & ~(crypto_tfm_ctx_alignment() - 1);
 205
 206         flags = ahash_request_flags(req);
 207         gfp = (flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?  GFP_KERNEL : GFP_ATOMIC;
 208         subreq = kmalloc(subreq_size, gfp);
 209         if (!subreq)
 210                 return -ENOMEM;
 211
 212         ahash_request_set_tfm(subreq, tfm);
 213         ahash_request_set_callback(subreq, flags, cplt, req);
 214
 215         result = (u8 *)(subreq + 1) + reqsize;
 216         result = PTR_ALIGN(result, alignmask + 1);
 217
 218         ahash_request_set_crypt(subreq, req->src, result, req->nbytes);
 219
 220         if (has_state) {
 221                 void *state;
 222
 223                 state = kmalloc(crypto_ahash_statesize(tfm), gfp);
 224                 if (!state) {
 225                         kfree(subreq);
 226                         return -ENOMEM;
 227                 }
 228
 229                 crypto_ahash_export(req, state);
 230                 crypto_ahash_import(subreq, state);
 231                 kfree_sensitive(state);
 232         }
 233
 234         req->priv = subreq;
 235
 236         return 0;
 237 }
 238
 239 static void ahash_restore_req(struct ahash_request *req, int err)
 240 {
 241         struct ahash_request *subreq = req->priv;
 242
 243         if (!err)
 244                 memcpy(req->result, subreq->result,
 245                        crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
 246
 247         req->priv = NULL;
 248
 249         kfree_sensitive(subreq);
 250 }
 251
 252 static void ahash_op_unaligned_done(void *data, int err)
 253 {
 254         struct ahash_request *areq = data;
 255
 256         if (err == -EINPROGRESS)
 257                 goto out;
 258
 259         /* First copy req->result into req->priv.result */
 260         ahash_restore_req(areq, err);
 261
 262 out:
 263         /* Complete the ORIGINAL request. */
 264         ahash_request_complete(areq, err);
 265 }
 266
 267 static int ahash_op_unaligned(struct ahash_request *req,
 268                               int (*op)(struct ahash_request *),
 269                               bool has_state)
 270 {
 271         int err;
 272
 273         err = ahash_save_req(req, ahash_op_unaligned_done, has_state);
 274         if (err)
 275                 return err;
 276
 277         err = op(req->priv);
 278         if (err == -EINPROGRESS || err == -EBUSY)
 279                 return err;
 280
 281         ahash_restore_req(req, err);
 282
 283         return err;
 284 }
 285
 286 static int crypto_ahash_op(struct ahash_request *req,
 287                            int (*op)(struct ahash_request *),
 288                            bool has_state)
 289 {
 290         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 291         unsigned long alignmask = crypto_ahash_alignmask(tfm);
 292         int err;
 293
 294         if ((unsigned long)req->result & alignmask)
 295                 err = ahash_op_unaligned(req, op, has_state);
 296         else
 297                 err = op(req);
 298
 299         return crypto_hash_errstat(crypto_hash_alg_common(tfm), err);
 300 }
 301
 302 int crypto_ahash_final(struct ahash_request *req)
 303 {
 304         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 305         struct hash_alg_common *alg = crypto_hash_alg_common(tfm);
 306
 307         if (IS_ENABLED(CONFIG_CRYPTO_STATS))
 308                 atomic64_inc(&hash_get_stat(alg)->hash_cnt);
 309
 310         return crypto_ahash_op(req, tfm->final, true);
 311 }
 312 EXPORT_SYMBOL_GPL(crypto_ahash_final);
 313
 314 int crypto_ahash_finup(struct ahash_request *req)
 315 {
 316         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 317         struct hash_alg_common *alg = crypto_hash_alg_common(tfm);
 318
 319         if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
 320                 struct crypto_istat_hash *istat = hash_get_stat(alg);
 321
 322                 atomic64_inc(&istat->hash_cnt);
 323                 atomic64_add(req->nbytes, &istat->hash_tlen);
 324         }
 325
 326         return crypto_ahash_op(req, tfm->finup, true);
 327 }
 328 EXPORT_SYMBOL_GPL(crypto_ahash_finup);
 329
 330 int crypto_ahash_digest(struct ahash_request *req)
 331 {
 332         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 333         struct hash_alg_common *alg = crypto_hash_alg_common(tfm);
 334
 335         if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
 336                 struct crypto_istat_hash *istat = hash_get_stat(alg);
 337
 338                 atomic64_inc(&istat->hash_cnt);
 339                 atomic64_add(req->nbytes, &istat->hash_tlen);
 340         }
 341
 342         if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
 343                 return crypto_hash_errstat(alg, -ENOKEY);
 344
 345         return crypto_ahash_op(req, tfm->digest, false);
 346 }
 347 EXPORT_SYMBOL_GPL(crypto_ahash_digest);
 348
 349 static void ahash_def_finup_done2(void *data, int err)
 350 {
 351         struct ahash_request *areq = data;
 352
 353         if (err == -EINPROGRESS)
 354                 return;
 355
 356         ahash_restore_req(areq, err);
 357
 358         ahash_request_complete(areq, err);
 359 }
 360
 361 static int ahash_def_finup_finish1(struct ahash_request *req, int err)
 362 {
 363         struct ahash_request *subreq = req->priv;
 364
 365         if (err)
 366                 goto out;
 367
 368         subreq->base.complete = ahash_def_finup_done2;
 369
 370         err = crypto_ahash_reqtfm(req)->final(subreq);
 371         if (err == -EINPROGRESS || err == -EBUSY)
 372                 return err;
 373
 374 out:
 375         ahash_restore_req(req, err);
 376         return err;
 377 }
 378
 379 static void ahash_def_finup_done1(void *data, int err)
 380 {
 381         struct ahash_request *areq = data;
 382         struct ahash_request *subreq;
 383
 384         if (err == -EINPROGRESS)
 385                 goto out;
 386
 387         subreq = areq->priv;
 388         subreq->base.flags &= CRYPTO_TFM_REQ_MAY_BACKLOG;
 389
 390         err = ahash_def_finup_finish1(areq, err);
 391         if (err == -EINPROGRESS || err == -EBUSY)
 392                 return;
 393
 394 out:
 395         ahash_request_complete(areq, err);
 396 }
 397
 398 static int ahash_def_finup(struct ahash_request *req)
 399 {
 400         struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
 401         int err;
 402
 403         err = ahash_save_req(req, ahash_def_finup_done1, true);
 404         if (err)
 405                 return err;
 406
 407         err = tfm->update(req->priv);
 408         if (err == -EINPROGRESS || err == -EBUSY)
 409                 return err;
 410
 411         return ahash_def_finup_finish1(req, err);
 412 }
 413
 414 static void crypto_ahash_exit_tfm(struct crypto_tfm *tfm)
 415 {
 416         struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
 417         struct ahash_alg *alg = crypto_ahash_alg(hash);
 418
 419         alg->exit_tfm(hash);
 420 }
 421
 422 static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
 423 {
 424         struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
 425         struct ahash_alg *alg = crypto_ahash_alg(hash);
 426
 427         hash->setkey = ahash_nosetkey;
 428
 429         crypto_ahash_set_statesize(hash, alg->halg.statesize);
 430
 431         if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
 432                 return crypto_init_shash_ops_async(tfm);
 433
 434         hash->init = alg->init;
 435         hash->update = alg->update;
 436         hash->final = alg->final;
 437         hash->finup = alg->finup ?: ahash_def_finup;
 438         hash->digest = alg->digest;
 439         hash->export = alg->export;
 440         hash->import = alg->import;
 441
 442         if (alg->setkey) {
 443                 hash->setkey = alg->setkey;
 444                 ahash_set_needkey(hash);
 445         }
 446
 447         if (alg->exit_tfm)
 448                 tfm->exit = crypto_ahash_exit_tfm;
 449
 450         return alg->init_tfm ? alg->init_tfm(hash) : 0;
 451 }
 452
 453 static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
 454 {
 455         if (alg->cra_type != &crypto_ahash_type)
 456                 return sizeof(struct crypto_shash *);
 457
 458         return crypto_alg_extsize(alg);
 459 }
 460
 461 static void crypto_ahash_free_instance(struct crypto_instance *inst)
 462 {
 463         struct ahash_instance *ahash = ahash_instance(inst);
 464
 465         ahash->free(ahash);
 466 }
 467
 468 static int __maybe_unused crypto_ahash_report(
 469         struct sk_buff *skb, struct crypto_alg *alg)
 470 {
 471         struct crypto_report_hash rhash;
 472
 473         memset(&rhash, 0, sizeof(rhash));
 474
 475         strscpy(rhash.type, "ahash", sizeof(rhash.type));
 476
 477         rhash.blocksize = alg->cra_blocksize;
 478         rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
 479
 480         return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
 481 }
 482
 483 static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
 484         __maybe_unused;
 485 static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
 486 {
 487         seq_printf(m, "type         : ahash\n");
 488         seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
 489                                              "yes" : "no");
 490         seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
 491         seq_printf(m, "digestsize   : %u\n",
 492                    __crypto_hash_alg_common(alg)->digestsize);
 493 }
 494
 495 static int __maybe_unused crypto_ahash_report_stat(
 496         struct sk_buff *skb, struct crypto_alg *alg)
 497 {
 498         return crypto_hash_report_stat(skb, alg, "ahash");
 499 }
 500
 501 static const struct crypto_type crypto_ahash_type = {
 502         .extsize = crypto_ahash_extsize,
 503         .init_tfm = crypto_ahash_init_tfm,
 504         .free = crypto_ahash_free_instance,
 505 #ifdef CONFIG_PROC_FS
 506         .show = crypto_ahash_show,
 507 #endif
 508 #if IS_ENABLED(CONFIG_CRYPTO_USER)
 509         .report = crypto_ahash_report,
 510 #endif
 511 #ifdef CONFIG_CRYPTO_STATS
 512         .report_stat = crypto_ahash_report_stat,
 513 #endif
 514         .maskclear = ~CRYPTO_ALG_TYPE_MASK,
 515         .maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
 516         .type = CRYPTO_ALG_TYPE_AHASH,
 517         .tfmsize = offsetof(struct crypto_ahash, base),
 518 };
 519
 520 int crypto_grab_ahash(struct crypto_ahash_spawn *spawn,
 521                       struct crypto_instance *inst,
 522                       const char *name, u32 type, u32 mask)
 523 {
 524         spawn->base.frontend = &crypto_ahash_type;
 525         return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
 526 }
 527 EXPORT_SYMBOL_GPL(crypto_grab_ahash);
 528
 529 struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
 530                                         u32 mask)
 531 {
 532         return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
 533 }
 534 EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
 535
 536 int crypto_has_ahash(const char *alg_name, u32 type, u32 mask)
 537 {
 538         return crypto_type_has_alg(alg_name, &crypto_ahash_type, type, mask);
 539 }
 540 EXPORT_SYMBOL_GPL(crypto_has_ahash);
 541
 542 struct crypto_ahash *crypto_clone_ahash(struct crypto_ahash *hash)
 543 {
 544         struct hash_alg_common *halg = crypto_hash_alg_common(hash);
 545         struct crypto_tfm *tfm = crypto_ahash_tfm(hash);
 546         struct crypto_ahash *nhash;
 547         struct ahash_alg *alg;
 548         int err;
 549
 550         if (!crypto_hash_alg_has_setkey(halg)) {
 551                 tfm = crypto_tfm_get(tfm);
 552                 if (IS_ERR(tfm))
 553                         return ERR_CAST(tfm);
 554
 555                 return hash;
 556         }
 557
 558         nhash = crypto_clone_tfm(&crypto_ahash_type, tfm);
 559
 560         if (IS_ERR(nhash))
 561                 return nhash;
 562
 563         nhash->init = hash->init;
 564         nhash->update = hash->update;
 565         nhash->final = hash->final;
 566         nhash->finup = hash->finup;
 567         nhash->digest = hash->digest;
 568         nhash->export = hash->export;
 569         nhash->import = hash->import;
 570         nhash->setkey = hash->setkey;
 571         nhash->reqsize = hash->reqsize;
 572         nhash->statesize = hash->statesize;
 573
 574         if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
 575                 return crypto_clone_shash_ops_async(nhash, hash);
 576
 577         err = -ENOSYS;
 578         alg = crypto_ahash_alg(hash);
 579         if (!alg->clone_tfm)
 580                 goto out_free_nhash;
 581
 582         err = alg->clone_tfm(nhash, hash);
 583         if (err)
 584                 goto out_free_nhash;
 585
 586         return nhash;
 587
 588 out_free_nhash:
 589         crypto_free_ahash(nhash);
 590         return ERR_PTR(err);
 591 }
 592 EXPORT_SYMBOL_GPL(crypto_clone_ahash);
 593
 594 static int ahash_prepare_alg(struct ahash_alg *alg)
 595 {
 596         struct crypto_alg *base = &alg->halg.base;
 597         int err;
 598
 599         if (alg->halg.statesize == 0)
 600                 return -EINVAL;
 601
 602         err = hash_prepare_alg(&alg->halg);
 603         if (err)
 604                 return err;
 605
 606         base->cra_type = &crypto_ahash_type;
 607         base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
 608
 609         return 0;
 610 }
 611
 612 int crypto_register_ahash(struct ahash_alg *alg)
 613 {
 614         struct crypto_alg *base = &alg->halg.base;
 615         int err;
 616
 617         err = ahash_prepare_alg(alg);
 618         if (err)
 619                 return err;
 620
 621         return crypto_register_alg(base);
 622 }
 623 EXPORT_SYMBOL_GPL(crypto_register_ahash);
 624
 625 void crypto_unregister_ahash(struct ahash_alg *alg)
 626 {
 627         crypto_unregister_alg(&alg->halg.base);
 628 }
 629 EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
 630
 631 int crypto_register_ahashes(struct ahash_alg *algs, int count)
 632 {
 633         int i, ret;
 634
 635         for (i = 0; i < count; i++) {
 636                 ret = crypto_register_ahash(&algs[i]);
 637                 if (ret)
 638                         goto err;
 639         }
 640
 641         return 0;
 642
 643 err:
 644         for (--i; i >= 0; --i)
 645                 crypto_unregister_ahash(&algs[i]);
 646
 647         return ret;
 648 }
 649 EXPORT_SYMBOL_GPL(crypto_register_ahashes);
 650
 651 void crypto_unregister_ahashes(struct ahash_alg *algs, int count)
 652 {
 653         int i;
 654
 655         for (i = count - 1; i >= 0; --i)
 656                 crypto_unregister_ahash(&algs[i]);
 657 }
 658 EXPORT_SYMBOL_GPL(crypto_unregister_ahashes);
 659
 660 int ahash_register_instance(struct crypto_template *tmpl,
 661                             struct ahash_instance *inst)
 662 {
 663         int err;
 664
 665         if (WARN_ON(!inst->free))
 666                 return -EINVAL;
 667
 668         err = ahash_prepare_alg(&inst->alg);
 669         if (err)
 670                 return err;
 671
 672         return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
 673 }
 674 EXPORT_SYMBOL_GPL(ahash_register_instance);
 675
 676 bool crypto_hash_alg_has_setkey(struct hash_alg_common *halg)
 677 {
 678         struct crypto_alg *alg = &halg->base;
 679
 680         if (alg->cra_type != &crypto_ahash_type)
 681                 return crypto_shash_alg_has_setkey(__crypto_shash_alg(alg));
 682
 683         return __crypto_ahash_alg(alg)->setkey != NULL;
 684 }
 685 EXPORT_SYMBOL_GPL(crypto_hash_alg_has_setkey);
 686
 687 MODULE_LICENSE("GPL");
 688 MODULE_DESCRIPTION("Asynchronous cryptographic hash type");