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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Asynchronous Cryptographic Hash operations.
4 *
5 * This is the implementation of the ahash (asynchronous hash) API. It differs
6 * from shash (synchronous hash) in that ahash supports asynchronous operations,
7 * and it hashes data from scatterlists instead of virtually addressed buffers.
8 *
9 * The ahash API provides access to both ahash and shash algorithms. The shash
10 * API only provides access to shash algorithms.
11 *
12 * Copyright (c) 2008 Loc Ho <lho@amcc.com>
13 */
14
15#include <crypto/scatterwalk.h>
16#include <linux/cryptouser.h>
17#include <linux/err.h>
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/sched.h>
21#include <linux/slab.h>
22#include <linux/seq_file.h>
23#include <linux/string.h>
24#include <net/netlink.h>
25
26#include "hash.h"
27
28#define CRYPTO_ALG_TYPE_AHASH_MASK 0x0000000e
29
30/*
31 * For an ahash tfm that is using an shash algorithm (instead of an ahash
32 * algorithm), this returns the underlying shash tfm.
33 */
34static inline struct crypto_shash *ahash_to_shash(struct crypto_ahash *tfm)
35{
36 return *(struct crypto_shash **)crypto_ahash_ctx(tfm);
37}
38
39static inline struct shash_desc *prepare_shash_desc(struct ahash_request *req,
40 struct crypto_ahash *tfm)
41{
42 struct shash_desc *desc = ahash_request_ctx(req);
43
44 desc->tfm = ahash_to_shash(tfm);
45 return desc;
46}
47
48int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
49{
50 struct crypto_hash_walk walk;
51 int nbytes;
52
53 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
54 nbytes = crypto_hash_walk_done(&walk, nbytes))
55 nbytes = crypto_shash_update(desc, walk.data, nbytes);
56
57 return nbytes;
58}
59EXPORT_SYMBOL_GPL(shash_ahash_update);
60
61int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
62{
63 struct crypto_hash_walk walk;
64 int nbytes;
65
66 nbytes = crypto_hash_walk_first(req, &walk);
67 if (!nbytes)
68 return crypto_shash_final(desc, req->result);
69
70 do {
71 nbytes = crypto_hash_walk_last(&walk) ?
72 crypto_shash_finup(desc, walk.data, nbytes,
73 req->result) :
74 crypto_shash_update(desc, walk.data, nbytes);
75 nbytes = crypto_hash_walk_done(&walk, nbytes);
76 } while (nbytes > 0);
77
78 return nbytes;
79}
80EXPORT_SYMBOL_GPL(shash_ahash_finup);
81
82int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
83{
84 unsigned int nbytes = req->nbytes;
85 struct scatterlist *sg;
86 unsigned int offset;
87 int err;
88
89 if (nbytes &&
90 (sg = req->src, offset = sg->offset,
91 nbytes <= min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
92 void *data;
93
94 data = kmap_local_page(sg_page(sg));
95 err = crypto_shash_digest(desc, data + offset, nbytes,
96 req->result);
97 kunmap_local(data);
98 } else
99 err = crypto_shash_init(desc) ?:
100 shash_ahash_finup(req, desc);
101
102 return err;
103}
104EXPORT_SYMBOL_GPL(shash_ahash_digest);
105
106static void crypto_exit_ahash_using_shash(struct crypto_tfm *tfm)
107{
108 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
109
110 crypto_free_shash(*ctx);
111}
112
113static int crypto_init_ahash_using_shash(struct crypto_tfm *tfm)
114{
115 struct crypto_alg *calg = tfm->__crt_alg;
116 struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
117 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
118 struct crypto_shash *shash;
119
120 if (!crypto_mod_get(calg))
121 return -EAGAIN;
122
123 shash = crypto_create_tfm(calg, &crypto_shash_type);
124 if (IS_ERR(shash)) {
125 crypto_mod_put(calg);
126 return PTR_ERR(shash);
127 }
128
129 crt->using_shash = true;
130 *ctx = shash;
131 tfm->exit = crypto_exit_ahash_using_shash;
132
133 crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
134 CRYPTO_TFM_NEED_KEY);
135 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
136
137 return 0;
138}
139
140static int hash_walk_next(struct crypto_hash_walk *walk)
141{
142 unsigned int offset = walk->offset;
143 unsigned int nbytes = min(walk->entrylen,
144 ((unsigned int)(PAGE_SIZE)) - offset);
145
146 walk->data = kmap_local_page(walk->pg);
147 walk->data += offset;
148 walk->entrylen -= nbytes;
149 return nbytes;
150}
151
152static int hash_walk_new_entry(struct crypto_hash_walk *walk)
153{
154 struct scatterlist *sg;
155
156 sg = walk->sg;
157 walk->offset = sg->offset;
158 walk->pg = sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
159 walk->offset = offset_in_page(walk->offset);
160 walk->entrylen = sg->length;
161
162 if (walk->entrylen > walk->total)
163 walk->entrylen = walk->total;
164 walk->total -= walk->entrylen;
165
166 return hash_walk_next(walk);
167}
168
169int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
170{
171 walk->data -= walk->offset;
172
173 kunmap_local(walk->data);
174 crypto_yield(walk->flags);
175
176 if (err)
177 return err;
178
179 if (walk->entrylen) {
180 walk->offset = 0;
181 walk->pg++;
182 return hash_walk_next(walk);
183 }
184
185 if (!walk->total)
186 return 0;
187
188 walk->sg = sg_next(walk->sg);
189
190 return hash_walk_new_entry(walk);
191}
192EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
193
194int crypto_hash_walk_first(struct ahash_request *req,
195 struct crypto_hash_walk *walk)
196{
197 walk->total = req->nbytes;
198
199 if (!walk->total) {
200 walk->entrylen = 0;
201 return 0;
202 }
203
204 walk->sg = req->src;
205 walk->flags = req->base.flags;
206
207 return hash_walk_new_entry(walk);
208}
209EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
210
211static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
212 unsigned int keylen)
213{
214 return -ENOSYS;
215}
216
217static void ahash_set_needkey(struct crypto_ahash *tfm, struct ahash_alg *alg)
218{
219 if (alg->setkey != ahash_nosetkey &&
220 !(alg->halg.base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
221 crypto_ahash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
222}
223
224int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
225 unsigned int keylen)
226{
227 if (likely(tfm->using_shash)) {
228 struct crypto_shash *shash = ahash_to_shash(tfm);
229 int err;
230
231 err = crypto_shash_setkey(shash, key, keylen);
232 if (unlikely(err)) {
233 crypto_ahash_set_flags(tfm,
234 crypto_shash_get_flags(shash) &
235 CRYPTO_TFM_NEED_KEY);
236 return err;
237 }
238 } else {
239 struct ahash_alg *alg = crypto_ahash_alg(tfm);
240 int err;
241
242 err = alg->setkey(tfm, key, keylen);
243 if (unlikely(err)) {
244 ahash_set_needkey(tfm, alg);
245 return err;
246 }
247 }
248 crypto_ahash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
249 return 0;
250}
251EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
252
253int crypto_ahash_init(struct ahash_request *req)
254{
255 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
256
257 if (likely(tfm->using_shash))
258 return crypto_shash_init(prepare_shash_desc(req, tfm));
259 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
260 return -ENOKEY;
261 return crypto_ahash_alg(tfm)->init(req);
262}
263EXPORT_SYMBOL_GPL(crypto_ahash_init);
264
265static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt,
266 bool has_state)
267{
268 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
269 unsigned int ds = crypto_ahash_digestsize(tfm);
270 struct ahash_request *subreq;
271 unsigned int subreq_size;
272 unsigned int reqsize;
273 u8 *result;
274 gfp_t gfp;
275 u32 flags;
276
277 subreq_size = sizeof(*subreq);
278 reqsize = crypto_ahash_reqsize(tfm);
279 reqsize = ALIGN(reqsize, crypto_tfm_ctx_alignment());
280 subreq_size += reqsize;
281 subreq_size += ds;
282
283 flags = ahash_request_flags(req);
284 gfp = (flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? GFP_KERNEL : GFP_ATOMIC;
285 subreq = kmalloc(subreq_size, gfp);
286 if (!subreq)
287 return -ENOMEM;
288
289 ahash_request_set_tfm(subreq, tfm);
290 ahash_request_set_callback(subreq, flags, cplt, req);
291
292 result = (u8 *)(subreq + 1) + reqsize;
293
294 ahash_request_set_crypt(subreq, req->src, result, req->nbytes);
295
296 if (has_state) {
297 void *state;
298
299 state = kmalloc(crypto_ahash_statesize(tfm), gfp);
300 if (!state) {
301 kfree(subreq);
302 return -ENOMEM;
303 }
304
305 crypto_ahash_export(req, state);
306 crypto_ahash_import(subreq, state);
307 kfree_sensitive(state);
308 }
309
310 req->priv = subreq;
311
312 return 0;
313}
314
315static void ahash_restore_req(struct ahash_request *req, int err)
316{
317 struct ahash_request *subreq = req->priv;
318
319 if (!err)
320 memcpy(req->result, subreq->result,
321 crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
322
323 req->priv = NULL;
324
325 kfree_sensitive(subreq);
326}
327
328int crypto_ahash_update(struct ahash_request *req)
329{
330 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
331
332 if (likely(tfm->using_shash))
333 return shash_ahash_update(req, ahash_request_ctx(req));
334
335 return crypto_ahash_alg(tfm)->update(req);
336}
337EXPORT_SYMBOL_GPL(crypto_ahash_update);
338
339int crypto_ahash_final(struct ahash_request *req)
340{
341 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
342
343 if (likely(tfm->using_shash))
344 return crypto_shash_final(ahash_request_ctx(req), req->result);
345
346 return crypto_ahash_alg(tfm)->final(req);
347}
348EXPORT_SYMBOL_GPL(crypto_ahash_final);
349
350int crypto_ahash_finup(struct ahash_request *req)
351{
352 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
353
354 if (likely(tfm->using_shash))
355 return shash_ahash_finup(req, ahash_request_ctx(req));
356
357 return crypto_ahash_alg(tfm)->finup(req);
358}
359EXPORT_SYMBOL_GPL(crypto_ahash_finup);
360
361int crypto_ahash_digest(struct ahash_request *req)
362{
363 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
364
365 if (likely(tfm->using_shash))
366 return shash_ahash_digest(req, prepare_shash_desc(req, tfm));
367
368 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
369 return -ENOKEY;
370
371 return crypto_ahash_alg(tfm)->digest(req);
372}
373EXPORT_SYMBOL_GPL(crypto_ahash_digest);
374
375static void ahash_def_finup_done2(void *data, int err)
376{
377 struct ahash_request *areq = data;
378
379 if (err == -EINPROGRESS)
380 return;
381
382 ahash_restore_req(areq, err);
383
384 ahash_request_complete(areq, err);
385}
386
387static int ahash_def_finup_finish1(struct ahash_request *req, int err)
388{
389 struct ahash_request *subreq = req->priv;
390
391 if (err)
392 goto out;
393
394 subreq->base.complete = ahash_def_finup_done2;
395
396 err = crypto_ahash_alg(crypto_ahash_reqtfm(req))->final(subreq);
397 if (err == -EINPROGRESS || err == -EBUSY)
398 return err;
399
400out:
401 ahash_restore_req(req, err);
402 return err;
403}
404
405static void ahash_def_finup_done1(void *data, int err)
406{
407 struct ahash_request *areq = data;
408 struct ahash_request *subreq;
409
410 if (err == -EINPROGRESS)
411 goto out;
412
413 subreq = areq->priv;
414 subreq->base.flags &= CRYPTO_TFM_REQ_MAY_BACKLOG;
415
416 err = ahash_def_finup_finish1(areq, err);
417 if (err == -EINPROGRESS || err == -EBUSY)
418 return;
419
420out:
421 ahash_request_complete(areq, err);
422}
423
424static int ahash_def_finup(struct ahash_request *req)
425{
426 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
427 int err;
428
429 err = ahash_save_req(req, ahash_def_finup_done1, true);
430 if (err)
431 return err;
432
433 err = crypto_ahash_alg(tfm)->update(req->priv);
434 if (err == -EINPROGRESS || err == -EBUSY)
435 return err;
436
437 return ahash_def_finup_finish1(req, err);
438}
439
440int crypto_ahash_export(struct ahash_request *req, void *out)
441{
442 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
443
444 if (likely(tfm->using_shash))
445 return crypto_shash_export(ahash_request_ctx(req), out);
446 return crypto_ahash_alg(tfm)->export(req, out);
447}
448EXPORT_SYMBOL_GPL(crypto_ahash_export);
449
450int crypto_ahash_import(struct ahash_request *req, const void *in)
451{
452 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
453
454 if (likely(tfm->using_shash))
455 return crypto_shash_import(prepare_shash_desc(req, tfm), in);
456 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
457 return -ENOKEY;
458 return crypto_ahash_alg(tfm)->import(req, in);
459}
460EXPORT_SYMBOL_GPL(crypto_ahash_import);
461
462static void crypto_ahash_exit_tfm(struct crypto_tfm *tfm)
463{
464 struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
465 struct ahash_alg *alg = crypto_ahash_alg(hash);
466
467 alg->exit_tfm(hash);
468}
469
470static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
471{
472 struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
473 struct ahash_alg *alg = crypto_ahash_alg(hash);
474
475 crypto_ahash_set_statesize(hash, alg->halg.statesize);
476
477 if (tfm->__crt_alg->cra_type == &crypto_shash_type)
478 return crypto_init_ahash_using_shash(tfm);
479
480 ahash_set_needkey(hash, alg);
481
482 if (alg->exit_tfm)
483 tfm->exit = crypto_ahash_exit_tfm;
484
485 return alg->init_tfm ? alg->init_tfm(hash) : 0;
486}
487
488static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
489{
490 if (alg->cra_type == &crypto_shash_type)
491 return sizeof(struct crypto_shash *);
492
493 return crypto_alg_extsize(alg);
494}
495
496static void crypto_ahash_free_instance(struct crypto_instance *inst)
497{
498 struct ahash_instance *ahash = ahash_instance(inst);
499
500 ahash->free(ahash);
501}
502
503static int __maybe_unused crypto_ahash_report(
504 struct sk_buff *skb, struct crypto_alg *alg)
505{
506 struct crypto_report_hash rhash;
507
508 memset(&rhash, 0, sizeof(rhash));
509
510 strscpy(rhash.type, "ahash", sizeof(rhash.type));
511
512 rhash.blocksize = alg->cra_blocksize;
513 rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
514
515 return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
516}
517
518static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
519 __maybe_unused;
520static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
521{
522 seq_printf(m, "type : ahash\n");
523 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
524 "yes" : "no");
525 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
526 seq_printf(m, "digestsize : %u\n",
527 __crypto_hash_alg_common(alg)->digestsize);
528}
529
530static const struct crypto_type crypto_ahash_type = {
531 .extsize = crypto_ahash_extsize,
532 .init_tfm = crypto_ahash_init_tfm,
533 .free = crypto_ahash_free_instance,
534#ifdef CONFIG_PROC_FS
535 .show = crypto_ahash_show,
536#endif
537#if IS_ENABLED(CONFIG_CRYPTO_USER)
538 .report = crypto_ahash_report,
539#endif
540 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
541 .maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
542 .type = CRYPTO_ALG_TYPE_AHASH,
543 .tfmsize = offsetof(struct crypto_ahash, base),
544};
545
546int crypto_grab_ahash(struct crypto_ahash_spawn *spawn,
547 struct crypto_instance *inst,
548 const char *name, u32 type, u32 mask)
549{
550 spawn->base.frontend = &crypto_ahash_type;
551 return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
552}
553EXPORT_SYMBOL_GPL(crypto_grab_ahash);
554
555struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
556 u32 mask)
557{
558 return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
559}
560EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
561
562int crypto_has_ahash(const char *alg_name, u32 type, u32 mask)
563{
564 return crypto_type_has_alg(alg_name, &crypto_ahash_type, type, mask);
565}
566EXPORT_SYMBOL_GPL(crypto_has_ahash);
567
568static bool crypto_hash_alg_has_setkey(struct hash_alg_common *halg)
569{
570 struct crypto_alg *alg = &halg->base;
571
572 if (alg->cra_type == &crypto_shash_type)
573 return crypto_shash_alg_has_setkey(__crypto_shash_alg(alg));
574
575 return __crypto_ahash_alg(alg)->setkey != ahash_nosetkey;
576}
577
578struct crypto_ahash *crypto_clone_ahash(struct crypto_ahash *hash)
579{
580 struct hash_alg_common *halg = crypto_hash_alg_common(hash);
581 struct crypto_tfm *tfm = crypto_ahash_tfm(hash);
582 struct crypto_ahash *nhash;
583 struct ahash_alg *alg;
584 int err;
585
586 if (!crypto_hash_alg_has_setkey(halg)) {
587 tfm = crypto_tfm_get(tfm);
588 if (IS_ERR(tfm))
589 return ERR_CAST(tfm);
590
591 return hash;
592 }
593
594 nhash = crypto_clone_tfm(&crypto_ahash_type, tfm);
595
596 if (IS_ERR(nhash))
597 return nhash;
598
599 nhash->reqsize = hash->reqsize;
600 nhash->statesize = hash->statesize;
601
602 if (likely(hash->using_shash)) {
603 struct crypto_shash **nctx = crypto_ahash_ctx(nhash);
604 struct crypto_shash *shash;
605
606 shash = crypto_clone_shash(ahash_to_shash(hash));
607 if (IS_ERR(shash)) {
608 err = PTR_ERR(shash);
609 goto out_free_nhash;
610 }
611 nhash->using_shash = true;
612 *nctx = shash;
613 return nhash;
614 }
615
616 err = -ENOSYS;
617 alg = crypto_ahash_alg(hash);
618 if (!alg->clone_tfm)
619 goto out_free_nhash;
620
621 err = alg->clone_tfm(nhash, hash);
622 if (err)
623 goto out_free_nhash;
624
625 return nhash;
626
627out_free_nhash:
628 crypto_free_ahash(nhash);
629 return ERR_PTR(err);
630}
631EXPORT_SYMBOL_GPL(crypto_clone_ahash);
632
633static int ahash_prepare_alg(struct ahash_alg *alg)
634{
635 struct crypto_alg *base = &alg->halg.base;
636 int err;
637
638 if (alg->halg.statesize == 0)
639 return -EINVAL;
640
641 err = hash_prepare_alg(&alg->halg);
642 if (err)
643 return err;
644
645 base->cra_type = &crypto_ahash_type;
646 base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
647
648 if (!alg->finup)
649 alg->finup = ahash_def_finup;
650 if (!alg->setkey)
651 alg->setkey = ahash_nosetkey;
652
653 return 0;
654}
655
656int crypto_register_ahash(struct ahash_alg *alg)
657{
658 struct crypto_alg *base = &alg->halg.base;
659 int err;
660
661 err = ahash_prepare_alg(alg);
662 if (err)
663 return err;
664
665 return crypto_register_alg(base);
666}
667EXPORT_SYMBOL_GPL(crypto_register_ahash);
668
669void crypto_unregister_ahash(struct ahash_alg *alg)
670{
671 crypto_unregister_alg(&alg->halg.base);
672}
673EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
674
675int crypto_register_ahashes(struct ahash_alg *algs, int count)
676{
677 int i, ret;
678
679 for (i = 0; i < count; i++) {
680 ret = crypto_register_ahash(&algs[i]);
681 if (ret)
682 goto err;
683 }
684
685 return 0;
686
687err:
688 for (--i; i >= 0; --i)
689 crypto_unregister_ahash(&algs[i]);
690
691 return ret;
692}
693EXPORT_SYMBOL_GPL(crypto_register_ahashes);
694
695void crypto_unregister_ahashes(struct ahash_alg *algs, int count)
696{
697 int i;
698
699 for (i = count - 1; i >= 0; --i)
700 crypto_unregister_ahash(&algs[i]);
701}
702EXPORT_SYMBOL_GPL(crypto_unregister_ahashes);
703
704int ahash_register_instance(struct crypto_template *tmpl,
705 struct ahash_instance *inst)
706{
707 int err;
708
709 if (WARN_ON(!inst->free))
710 return -EINVAL;
711
712 err = ahash_prepare_alg(&inst->alg);
713 if (err)
714 return err;
715
716 return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
717}
718EXPORT_SYMBOL_GPL(ahash_register_instance);
719
720MODULE_LICENSE("GPL");
721MODULE_DESCRIPTION("Asynchronous cryptographic hash type");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Asynchronous Cryptographic Hash operations.
4 *
5 * This is the implementation of the ahash (asynchronous hash) API. It differs
6 * from shash (synchronous hash) in that ahash supports asynchronous operations,
7 * and it hashes data from scatterlists instead of virtually addressed buffers.
8 *
9 * The ahash API provides access to both ahash and shash algorithms. The shash
10 * API only provides access to shash algorithms.
11 *
12 * Copyright (c) 2008 Loc Ho <lho@amcc.com>
13 */
14
15#include <crypto/scatterwalk.h>
16#include <linux/cryptouser.h>
17#include <linux/err.h>
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/sched.h>
21#include <linux/slab.h>
22#include <linux/seq_file.h>
23#include <linux/string.h>
24#include <net/netlink.h>
25
26#include "hash.h"
27
28#define CRYPTO_ALG_TYPE_AHASH_MASK 0x0000000e
29
30static inline struct crypto_istat_hash *ahash_get_stat(struct ahash_alg *alg)
31{
32 return hash_get_stat(&alg->halg);
33}
34
35static inline int crypto_ahash_errstat(struct ahash_alg *alg, int err)
36{
37 if (!IS_ENABLED(CONFIG_CRYPTO_STATS))
38 return err;
39
40 if (err && err != -EINPROGRESS && err != -EBUSY)
41 atomic64_inc(&ahash_get_stat(alg)->err_cnt);
42
43 return err;
44}
45
46/*
47 * For an ahash tfm that is using an shash algorithm (instead of an ahash
48 * algorithm), this returns the underlying shash tfm.
49 */
50static inline struct crypto_shash *ahash_to_shash(struct crypto_ahash *tfm)
51{
52 return *(struct crypto_shash **)crypto_ahash_ctx(tfm);
53}
54
55static inline struct shash_desc *prepare_shash_desc(struct ahash_request *req,
56 struct crypto_ahash *tfm)
57{
58 struct shash_desc *desc = ahash_request_ctx(req);
59
60 desc->tfm = ahash_to_shash(tfm);
61 return desc;
62}
63
64int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
65{
66 struct crypto_hash_walk walk;
67 int nbytes;
68
69 for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
70 nbytes = crypto_hash_walk_done(&walk, nbytes))
71 nbytes = crypto_shash_update(desc, walk.data, nbytes);
72
73 return nbytes;
74}
75EXPORT_SYMBOL_GPL(shash_ahash_update);
76
77int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
78{
79 struct crypto_hash_walk walk;
80 int nbytes;
81
82 nbytes = crypto_hash_walk_first(req, &walk);
83 if (!nbytes)
84 return crypto_shash_final(desc, req->result);
85
86 do {
87 nbytes = crypto_hash_walk_last(&walk) ?
88 crypto_shash_finup(desc, walk.data, nbytes,
89 req->result) :
90 crypto_shash_update(desc, walk.data, nbytes);
91 nbytes = crypto_hash_walk_done(&walk, nbytes);
92 } while (nbytes > 0);
93
94 return nbytes;
95}
96EXPORT_SYMBOL_GPL(shash_ahash_finup);
97
98int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
99{
100 unsigned int nbytes = req->nbytes;
101 struct scatterlist *sg;
102 unsigned int offset;
103 int err;
104
105 if (nbytes &&
106 (sg = req->src, offset = sg->offset,
107 nbytes <= min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
108 void *data;
109
110 data = kmap_local_page(sg_page(sg));
111 err = crypto_shash_digest(desc, data + offset, nbytes,
112 req->result);
113 kunmap_local(data);
114 } else
115 err = crypto_shash_init(desc) ?:
116 shash_ahash_finup(req, desc);
117
118 return err;
119}
120EXPORT_SYMBOL_GPL(shash_ahash_digest);
121
122static void crypto_exit_ahash_using_shash(struct crypto_tfm *tfm)
123{
124 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
125
126 crypto_free_shash(*ctx);
127}
128
129static int crypto_init_ahash_using_shash(struct crypto_tfm *tfm)
130{
131 struct crypto_alg *calg = tfm->__crt_alg;
132 struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
133 struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
134 struct crypto_shash *shash;
135
136 if (!crypto_mod_get(calg))
137 return -EAGAIN;
138
139 shash = crypto_create_tfm(calg, &crypto_shash_type);
140 if (IS_ERR(shash)) {
141 crypto_mod_put(calg);
142 return PTR_ERR(shash);
143 }
144
145 crt->using_shash = true;
146 *ctx = shash;
147 tfm->exit = crypto_exit_ahash_using_shash;
148
149 crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
150 CRYPTO_TFM_NEED_KEY);
151 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
152
153 return 0;
154}
155
156static int hash_walk_next(struct crypto_hash_walk *walk)
157{
158 unsigned int offset = walk->offset;
159 unsigned int nbytes = min(walk->entrylen,
160 ((unsigned int)(PAGE_SIZE)) - offset);
161
162 walk->data = kmap_local_page(walk->pg);
163 walk->data += offset;
164 walk->entrylen -= nbytes;
165 return nbytes;
166}
167
168static int hash_walk_new_entry(struct crypto_hash_walk *walk)
169{
170 struct scatterlist *sg;
171
172 sg = walk->sg;
173 walk->offset = sg->offset;
174 walk->pg = sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
175 walk->offset = offset_in_page(walk->offset);
176 walk->entrylen = sg->length;
177
178 if (walk->entrylen > walk->total)
179 walk->entrylen = walk->total;
180 walk->total -= walk->entrylen;
181
182 return hash_walk_next(walk);
183}
184
185int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
186{
187 walk->data -= walk->offset;
188
189 kunmap_local(walk->data);
190 crypto_yield(walk->flags);
191
192 if (err)
193 return err;
194
195 if (walk->entrylen) {
196 walk->offset = 0;
197 walk->pg++;
198 return hash_walk_next(walk);
199 }
200
201 if (!walk->total)
202 return 0;
203
204 walk->sg = sg_next(walk->sg);
205
206 return hash_walk_new_entry(walk);
207}
208EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
209
210int crypto_hash_walk_first(struct ahash_request *req,
211 struct crypto_hash_walk *walk)
212{
213 walk->total = req->nbytes;
214
215 if (!walk->total) {
216 walk->entrylen = 0;
217 return 0;
218 }
219
220 walk->sg = req->src;
221 walk->flags = req->base.flags;
222
223 return hash_walk_new_entry(walk);
224}
225EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
226
227static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
228 unsigned int keylen)
229{
230 return -ENOSYS;
231}
232
233static void ahash_set_needkey(struct crypto_ahash *tfm, struct ahash_alg *alg)
234{
235 if (alg->setkey != ahash_nosetkey &&
236 !(alg->halg.base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
237 crypto_ahash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
238}
239
240int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
241 unsigned int keylen)
242{
243 if (likely(tfm->using_shash)) {
244 struct crypto_shash *shash = ahash_to_shash(tfm);
245 int err;
246
247 err = crypto_shash_setkey(shash, key, keylen);
248 if (unlikely(err)) {
249 crypto_ahash_set_flags(tfm,
250 crypto_shash_get_flags(shash) &
251 CRYPTO_TFM_NEED_KEY);
252 return err;
253 }
254 } else {
255 struct ahash_alg *alg = crypto_ahash_alg(tfm);
256 int err;
257
258 err = alg->setkey(tfm, key, keylen);
259 if (unlikely(err)) {
260 ahash_set_needkey(tfm, alg);
261 return err;
262 }
263 }
264 crypto_ahash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
265 return 0;
266}
267EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
268
269int crypto_ahash_init(struct ahash_request *req)
270{
271 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
272
273 if (likely(tfm->using_shash))
274 return crypto_shash_init(prepare_shash_desc(req, tfm));
275 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
276 return -ENOKEY;
277 return crypto_ahash_alg(tfm)->init(req);
278}
279EXPORT_SYMBOL_GPL(crypto_ahash_init);
280
281static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt,
282 bool has_state)
283{
284 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
285 unsigned int ds = crypto_ahash_digestsize(tfm);
286 struct ahash_request *subreq;
287 unsigned int subreq_size;
288 unsigned int reqsize;
289 u8 *result;
290 gfp_t gfp;
291 u32 flags;
292
293 subreq_size = sizeof(*subreq);
294 reqsize = crypto_ahash_reqsize(tfm);
295 reqsize = ALIGN(reqsize, crypto_tfm_ctx_alignment());
296 subreq_size += reqsize;
297 subreq_size += ds;
298
299 flags = ahash_request_flags(req);
300 gfp = (flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? GFP_KERNEL : GFP_ATOMIC;
301 subreq = kmalloc(subreq_size, gfp);
302 if (!subreq)
303 return -ENOMEM;
304
305 ahash_request_set_tfm(subreq, tfm);
306 ahash_request_set_callback(subreq, flags, cplt, req);
307
308 result = (u8 *)(subreq + 1) + reqsize;
309
310 ahash_request_set_crypt(subreq, req->src, result, req->nbytes);
311
312 if (has_state) {
313 void *state;
314
315 state = kmalloc(crypto_ahash_statesize(tfm), gfp);
316 if (!state) {
317 kfree(subreq);
318 return -ENOMEM;
319 }
320
321 crypto_ahash_export(req, state);
322 crypto_ahash_import(subreq, state);
323 kfree_sensitive(state);
324 }
325
326 req->priv = subreq;
327
328 return 0;
329}
330
331static void ahash_restore_req(struct ahash_request *req, int err)
332{
333 struct ahash_request *subreq = req->priv;
334
335 if (!err)
336 memcpy(req->result, subreq->result,
337 crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
338
339 req->priv = NULL;
340
341 kfree_sensitive(subreq);
342}
343
344int crypto_ahash_update(struct ahash_request *req)
345{
346 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
347 struct ahash_alg *alg;
348
349 if (likely(tfm->using_shash))
350 return shash_ahash_update(req, ahash_request_ctx(req));
351
352 alg = crypto_ahash_alg(tfm);
353 if (IS_ENABLED(CONFIG_CRYPTO_STATS))
354 atomic64_add(req->nbytes, &ahash_get_stat(alg)->hash_tlen);
355 return crypto_ahash_errstat(alg, alg->update(req));
356}
357EXPORT_SYMBOL_GPL(crypto_ahash_update);
358
359int crypto_ahash_final(struct ahash_request *req)
360{
361 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
362 struct ahash_alg *alg;
363
364 if (likely(tfm->using_shash))
365 return crypto_shash_final(ahash_request_ctx(req), req->result);
366
367 alg = crypto_ahash_alg(tfm);
368 if (IS_ENABLED(CONFIG_CRYPTO_STATS))
369 atomic64_inc(&ahash_get_stat(alg)->hash_cnt);
370 return crypto_ahash_errstat(alg, alg->final(req));
371}
372EXPORT_SYMBOL_GPL(crypto_ahash_final);
373
374int crypto_ahash_finup(struct ahash_request *req)
375{
376 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
377 struct ahash_alg *alg;
378
379 if (likely(tfm->using_shash))
380 return shash_ahash_finup(req, ahash_request_ctx(req));
381
382 alg = crypto_ahash_alg(tfm);
383 if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
384 struct crypto_istat_hash *istat = ahash_get_stat(alg);
385
386 atomic64_inc(&istat->hash_cnt);
387 atomic64_add(req->nbytes, &istat->hash_tlen);
388 }
389 return crypto_ahash_errstat(alg, alg->finup(req));
390}
391EXPORT_SYMBOL_GPL(crypto_ahash_finup);
392
393int crypto_ahash_digest(struct ahash_request *req)
394{
395 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
396 struct ahash_alg *alg;
397 int err;
398
399 if (likely(tfm->using_shash))
400 return shash_ahash_digest(req, prepare_shash_desc(req, tfm));
401
402 alg = crypto_ahash_alg(tfm);
403 if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
404 struct crypto_istat_hash *istat = ahash_get_stat(alg);
405
406 atomic64_inc(&istat->hash_cnt);
407 atomic64_add(req->nbytes, &istat->hash_tlen);
408 }
409
410 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
411 err = -ENOKEY;
412 else
413 err = alg->digest(req);
414
415 return crypto_ahash_errstat(alg, err);
416}
417EXPORT_SYMBOL_GPL(crypto_ahash_digest);
418
419static void ahash_def_finup_done2(void *data, int err)
420{
421 struct ahash_request *areq = data;
422
423 if (err == -EINPROGRESS)
424 return;
425
426 ahash_restore_req(areq, err);
427
428 ahash_request_complete(areq, err);
429}
430
431static int ahash_def_finup_finish1(struct ahash_request *req, int err)
432{
433 struct ahash_request *subreq = req->priv;
434
435 if (err)
436 goto out;
437
438 subreq->base.complete = ahash_def_finup_done2;
439
440 err = crypto_ahash_alg(crypto_ahash_reqtfm(req))->final(subreq);
441 if (err == -EINPROGRESS || err == -EBUSY)
442 return err;
443
444out:
445 ahash_restore_req(req, err);
446 return err;
447}
448
449static void ahash_def_finup_done1(void *data, int err)
450{
451 struct ahash_request *areq = data;
452 struct ahash_request *subreq;
453
454 if (err == -EINPROGRESS)
455 goto out;
456
457 subreq = areq->priv;
458 subreq->base.flags &= CRYPTO_TFM_REQ_MAY_BACKLOG;
459
460 err = ahash_def_finup_finish1(areq, err);
461 if (err == -EINPROGRESS || err == -EBUSY)
462 return;
463
464out:
465 ahash_request_complete(areq, err);
466}
467
468static int ahash_def_finup(struct ahash_request *req)
469{
470 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
471 int err;
472
473 err = ahash_save_req(req, ahash_def_finup_done1, true);
474 if (err)
475 return err;
476
477 err = crypto_ahash_alg(tfm)->update(req->priv);
478 if (err == -EINPROGRESS || err == -EBUSY)
479 return err;
480
481 return ahash_def_finup_finish1(req, err);
482}
483
484int crypto_ahash_export(struct ahash_request *req, void *out)
485{
486 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
487
488 if (likely(tfm->using_shash))
489 return crypto_shash_export(ahash_request_ctx(req), out);
490 return crypto_ahash_alg(tfm)->export(req, out);
491}
492EXPORT_SYMBOL_GPL(crypto_ahash_export);
493
494int crypto_ahash_import(struct ahash_request *req, const void *in)
495{
496 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
497
498 if (likely(tfm->using_shash))
499 return crypto_shash_import(prepare_shash_desc(req, tfm), in);
500 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
501 return -ENOKEY;
502 return crypto_ahash_alg(tfm)->import(req, in);
503}
504EXPORT_SYMBOL_GPL(crypto_ahash_import);
505
506static void crypto_ahash_exit_tfm(struct crypto_tfm *tfm)
507{
508 struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
509 struct ahash_alg *alg = crypto_ahash_alg(hash);
510
511 alg->exit_tfm(hash);
512}
513
514static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
515{
516 struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
517 struct ahash_alg *alg = crypto_ahash_alg(hash);
518
519 crypto_ahash_set_statesize(hash, alg->halg.statesize);
520
521 if (tfm->__crt_alg->cra_type == &crypto_shash_type)
522 return crypto_init_ahash_using_shash(tfm);
523
524 ahash_set_needkey(hash, alg);
525
526 if (alg->exit_tfm)
527 tfm->exit = crypto_ahash_exit_tfm;
528
529 return alg->init_tfm ? alg->init_tfm(hash) : 0;
530}
531
532static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
533{
534 if (alg->cra_type == &crypto_shash_type)
535 return sizeof(struct crypto_shash *);
536
537 return crypto_alg_extsize(alg);
538}
539
540static void crypto_ahash_free_instance(struct crypto_instance *inst)
541{
542 struct ahash_instance *ahash = ahash_instance(inst);
543
544 ahash->free(ahash);
545}
546
547static int __maybe_unused crypto_ahash_report(
548 struct sk_buff *skb, struct crypto_alg *alg)
549{
550 struct crypto_report_hash rhash;
551
552 memset(&rhash, 0, sizeof(rhash));
553
554 strscpy(rhash.type, "ahash", sizeof(rhash.type));
555
556 rhash.blocksize = alg->cra_blocksize;
557 rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
558
559 return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
560}
561
562static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
563 __maybe_unused;
564static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
565{
566 seq_printf(m, "type : ahash\n");
567 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
568 "yes" : "no");
569 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
570 seq_printf(m, "digestsize : %u\n",
571 __crypto_hash_alg_common(alg)->digestsize);
572}
573
574static int __maybe_unused crypto_ahash_report_stat(
575 struct sk_buff *skb, struct crypto_alg *alg)
576{
577 return crypto_hash_report_stat(skb, alg, "ahash");
578}
579
580static const struct crypto_type crypto_ahash_type = {
581 .extsize = crypto_ahash_extsize,
582 .init_tfm = crypto_ahash_init_tfm,
583 .free = crypto_ahash_free_instance,
584#ifdef CONFIG_PROC_FS
585 .show = crypto_ahash_show,
586#endif
587#if IS_ENABLED(CONFIG_CRYPTO_USER)
588 .report = crypto_ahash_report,
589#endif
590#ifdef CONFIG_CRYPTO_STATS
591 .report_stat = crypto_ahash_report_stat,
592#endif
593 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
594 .maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
595 .type = CRYPTO_ALG_TYPE_AHASH,
596 .tfmsize = offsetof(struct crypto_ahash, base),
597};
598
599int crypto_grab_ahash(struct crypto_ahash_spawn *spawn,
600 struct crypto_instance *inst,
601 const char *name, u32 type, u32 mask)
602{
603 spawn->base.frontend = &crypto_ahash_type;
604 return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
605}
606EXPORT_SYMBOL_GPL(crypto_grab_ahash);
607
608struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
609 u32 mask)
610{
611 return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
612}
613EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
614
615int crypto_has_ahash(const char *alg_name, u32 type, u32 mask)
616{
617 return crypto_type_has_alg(alg_name, &crypto_ahash_type, type, mask);
618}
619EXPORT_SYMBOL_GPL(crypto_has_ahash);
620
621struct crypto_ahash *crypto_clone_ahash(struct crypto_ahash *hash)
622{
623 struct hash_alg_common *halg = crypto_hash_alg_common(hash);
624 struct crypto_tfm *tfm = crypto_ahash_tfm(hash);
625 struct crypto_ahash *nhash;
626 struct ahash_alg *alg;
627 int err;
628
629 if (!crypto_hash_alg_has_setkey(halg)) {
630 tfm = crypto_tfm_get(tfm);
631 if (IS_ERR(tfm))
632 return ERR_CAST(tfm);
633
634 return hash;
635 }
636
637 nhash = crypto_clone_tfm(&crypto_ahash_type, tfm);
638
639 if (IS_ERR(nhash))
640 return nhash;
641
642 nhash->reqsize = hash->reqsize;
643 nhash->statesize = hash->statesize;
644
645 if (likely(hash->using_shash)) {
646 struct crypto_shash **nctx = crypto_ahash_ctx(nhash);
647 struct crypto_shash *shash;
648
649 shash = crypto_clone_shash(ahash_to_shash(hash));
650 if (IS_ERR(shash)) {
651 err = PTR_ERR(shash);
652 goto out_free_nhash;
653 }
654 nhash->using_shash = true;
655 *nctx = shash;
656 return nhash;
657 }
658
659 err = -ENOSYS;
660 alg = crypto_ahash_alg(hash);
661 if (!alg->clone_tfm)
662 goto out_free_nhash;
663
664 err = alg->clone_tfm(nhash, hash);
665 if (err)
666 goto out_free_nhash;
667
668 return nhash;
669
670out_free_nhash:
671 crypto_free_ahash(nhash);
672 return ERR_PTR(err);
673}
674EXPORT_SYMBOL_GPL(crypto_clone_ahash);
675
676static int ahash_prepare_alg(struct ahash_alg *alg)
677{
678 struct crypto_alg *base = &alg->halg.base;
679 int err;
680
681 if (alg->halg.statesize == 0)
682 return -EINVAL;
683
684 err = hash_prepare_alg(&alg->halg);
685 if (err)
686 return err;
687
688 base->cra_type = &crypto_ahash_type;
689 base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
690
691 if (!alg->finup)
692 alg->finup = ahash_def_finup;
693 if (!alg->setkey)
694 alg->setkey = ahash_nosetkey;
695
696 return 0;
697}
698
699int crypto_register_ahash(struct ahash_alg *alg)
700{
701 struct crypto_alg *base = &alg->halg.base;
702 int err;
703
704 err = ahash_prepare_alg(alg);
705 if (err)
706 return err;
707
708 return crypto_register_alg(base);
709}
710EXPORT_SYMBOL_GPL(crypto_register_ahash);
711
712void crypto_unregister_ahash(struct ahash_alg *alg)
713{
714 crypto_unregister_alg(&alg->halg.base);
715}
716EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
717
718int crypto_register_ahashes(struct ahash_alg *algs, int count)
719{
720 int i, ret;
721
722 for (i = 0; i < count; i++) {
723 ret = crypto_register_ahash(&algs[i]);
724 if (ret)
725 goto err;
726 }
727
728 return 0;
729
730err:
731 for (--i; i >= 0; --i)
732 crypto_unregister_ahash(&algs[i]);
733
734 return ret;
735}
736EXPORT_SYMBOL_GPL(crypto_register_ahashes);
737
738void crypto_unregister_ahashes(struct ahash_alg *algs, int count)
739{
740 int i;
741
742 for (i = count - 1; i >= 0; --i)
743 crypto_unregister_ahash(&algs[i]);
744}
745EXPORT_SYMBOL_GPL(crypto_unregister_ahashes);
746
747int ahash_register_instance(struct crypto_template *tmpl,
748 struct ahash_instance *inst)
749{
750 int err;
751
752 if (WARN_ON(!inst->free))
753 return -EINVAL;
754
755 err = ahash_prepare_alg(&inst->alg);
756 if (err)
757 return err;
758
759 return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
760}
761EXPORT_SYMBOL_GPL(ahash_register_instance);
762
763bool crypto_hash_alg_has_setkey(struct hash_alg_common *halg)
764{
765 struct crypto_alg *alg = &halg->base;
766
767 if (alg->cra_type == &crypto_shash_type)
768 return crypto_shash_alg_has_setkey(__crypto_shash_alg(alg));
769
770 return __crypto_ahash_alg(alg)->setkey != ahash_nosetkey;
771}
772EXPORT_SYMBOL_GPL(crypto_hash_alg_has_setkey);
773
774MODULE_LICENSE("GPL");
775MODULE_DESCRIPTION("Asynchronous cryptographic hash type");