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: &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(v: &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: &walk); nbytes > 0;
70 nbytes = crypto_hash_walk_done(walk: &walk, err: nbytes))
71 nbytes = crypto_shash_update(desc, data: walk.data, len: 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: &walk);
83 if (!nbytes)
84 return crypto_shash_final(desc, out: req->result);
85
86 do {
87 nbytes = crypto_hash_walk_last(walk: &walk) ?
88 crypto_shash_finup(desc, data: walk.data, len: nbytes,
89 out: req->result) :
90 crypto_shash_update(desc, data: walk.data, len: nbytes);
91 nbytes = crypto_hash_walk_done(walk: &walk, err: 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(page: sg_page(sg));
111 err = crypto_shash_digest(desc, data: data + offset, len: nbytes,
112 out: 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(tfm: *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(alg: calg))
137 return -EAGAIN;
138
139 shash = crypto_create_tfm(alg: calg, frontend: &crypto_shash_type);
140 if (IS_ERR(ptr: shash)) {
141 crypto_mod_put(alg: calg);
142 return PTR_ERR(ptr: 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(tfm: crt, flags: crypto_shash_get_flags(tfm: shash) &
150 CRYPTO_TFM_NEED_KEY);
151 crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(tfm: 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(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(sg: 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(flags: 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(tfm: shash, key, keylen);
248 if (unlikely(err)) {
249 crypto_ahash_set_flags(tfm,
250 flags: crypto_shash_get_flags(tfm: shash) &
251 CRYPTO_TFM_NEED_KEY);
252 return err;
253 }
254 } else {
255 struct ahash_alg *alg = crypto_ahash_alg(hash: 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(desc: prepare_shash_desc(req, tfm));
275 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
276 return -ENOKEY;
277 return crypto_ahash_alg(hash: 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(size: subreq_size, flags: gfp);
302 if (!subreq)
303 return -ENOMEM;
304
305 ahash_request_set_tfm(req: subreq, tfm);
306 ahash_request_set_callback(req: subreq, flags, compl: cplt, data: req);
307
308 result = (u8 *)(subreq + 1) + reqsize;
309
310 ahash_request_set_crypt(req: subreq, src: req->src, result, nbytes: req->nbytes);
311
312 if (has_state) {
313 void *state;
314
315 state = kmalloc(size: crypto_ahash_statesize(tfm), flags: gfp);
316 if (!state) {
317 kfree(objp: subreq);
318 return -ENOMEM;
319 }
320
321 crypto_ahash_export(req, out: state);
322 crypto_ahash_import(req: subreq, in: state);
323 kfree_sensitive(objp: 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(objp: 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(hash: tfm);
353 if (IS_ENABLED(CONFIG_CRYPTO_STATS))
354 atomic64_add(i: req->nbytes, v: &ahash_get_stat(alg)->hash_tlen);
355 return crypto_ahash_errstat(alg, err: 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(desc: ahash_request_ctx(req), out: req->result);
366
367 alg = crypto_ahash_alg(hash: tfm);
368 if (IS_ENABLED(CONFIG_CRYPTO_STATS))
369 atomic64_inc(v: &ahash_get_stat(alg)->hash_cnt);
370 return crypto_ahash_errstat(alg, err: 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(hash: tfm);
383 if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
384 struct crypto_istat_hash *istat = ahash_get_stat(alg);
385
386 atomic64_inc(v: &istat->hash_cnt);
387 atomic64_add(i: req->nbytes, v: &istat->hash_tlen);
388 }
389 return crypto_ahash_errstat(alg, err: 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(hash: tfm);
403 if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
404 struct crypto_istat_hash *istat = ahash_get_stat(alg);
405
406 atomic64_inc(v: &istat->hash_cnt);
407 atomic64_add(i: req->nbytes, v: &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(req: areq, err);
427
428 ahash_request_complete(req: 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(hash: 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(req: areq, err);
461 if (err == -EINPROGRESS || err == -EBUSY)
462 return;
463
464out:
465 ahash_request_complete(req: 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, cplt: ahash_def_finup_done1, has_state: true);
474 if (err)
475 return err;
476
477 err = crypto_ahash_alg(hash: 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(desc: ahash_request_ctx(req), out);
490 return crypto_ahash_alg(hash: 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(desc: 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(hash: 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(tfm: hash, size: 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(tfm: 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(p: rhash.type, q: "ahash", size: 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, attrtype: CRYPTOCFGA_REPORT_HASH, attrlen: sizeof(rhash), data: &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, fmt: "type : ahash\n");
567 seq_printf(m, fmt: "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
568 "yes" : "no");
569 seq_printf(m, fmt: "blocksize : %u\n", alg->cra_blocksize);
570 seq_printf(m, fmt: "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, type: "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: &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, frontend: &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(name: alg_name, frontend: &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(tfm: hash);
624 struct crypto_tfm *tfm = crypto_ahash_tfm(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(ptr: tfm))
632 return ERR_CAST(ptr: tfm);
633
634 return hash;
635 }
636
637 nhash = crypto_clone_tfm(frontend: &crypto_ahash_type, otfm: tfm);
638
639 if (IS_ERR(ptr: 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(tfm: nhash);
647 struct crypto_shash *shash;
648
649 shash = crypto_clone_shash(tfm: ahash_to_shash(tfm: hash));
650 if (IS_ERR(ptr: shash)) {
651 err = PTR_ERR(ptr: shash);
652 goto out_free_nhash;
653 }
654 *nctx = shash;
655 return nhash;
656 }
657
658 err = -ENOSYS;
659 alg = crypto_ahash_alg(hash);
660 if (!alg->clone_tfm)
661 goto out_free_nhash;
662
663 err = alg->clone_tfm(nhash, hash);
664 if (err)
665 goto out_free_nhash;
666
667 return nhash;
668
669out_free_nhash:
670 crypto_free_ahash(tfm: nhash);
671 return ERR_PTR(error: err);
672}
673EXPORT_SYMBOL_GPL(crypto_clone_ahash);
674
675static int ahash_prepare_alg(struct ahash_alg *alg)
676{
677 struct crypto_alg *base = &alg->halg.base;
678 int err;
679
680 if (alg->halg.statesize == 0)
681 return -EINVAL;
682
683 err = hash_prepare_alg(alg: &alg->halg);
684 if (err)
685 return err;
686
687 base->cra_type = &crypto_ahash_type;
688 base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
689
690 if (!alg->finup)
691 alg->finup = ahash_def_finup;
692 if (!alg->setkey)
693 alg->setkey = ahash_nosetkey;
694
695 return 0;
696}
697
698int crypto_register_ahash(struct ahash_alg *alg)
699{
700 struct crypto_alg *base = &alg->halg.base;
701 int err;
702
703 err = ahash_prepare_alg(alg);
704 if (err)
705 return err;
706
707 return crypto_register_alg(alg: base);
708}
709EXPORT_SYMBOL_GPL(crypto_register_ahash);
710
711void crypto_unregister_ahash(struct ahash_alg *alg)
712{
713 crypto_unregister_alg(alg: &alg->halg.base);
714}
715EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
716
717int crypto_register_ahashes(struct ahash_alg *algs, int count)
718{
719 int i, ret;
720
721 for (i = 0; i < count; i++) {
722 ret = crypto_register_ahash(&algs[i]);
723 if (ret)
724 goto err;
725 }
726
727 return 0;
728
729err:
730 for (--i; i >= 0; --i)
731 crypto_unregister_ahash(&algs[i]);
732
733 return ret;
734}
735EXPORT_SYMBOL_GPL(crypto_register_ahashes);
736
737void crypto_unregister_ahashes(struct ahash_alg *algs, int count)
738{
739 int i;
740
741 for (i = count - 1; i >= 0; --i)
742 crypto_unregister_ahash(&algs[i]);
743}
744EXPORT_SYMBOL_GPL(crypto_unregister_ahashes);
745
746int ahash_register_instance(struct crypto_template *tmpl,
747 struct ahash_instance *inst)
748{
749 int err;
750
751 if (WARN_ON(!inst->free))
752 return -EINVAL;
753
754 err = ahash_prepare_alg(alg: &inst->alg);
755 if (err)
756 return err;
757
758 return crypto_register_instance(tmpl, inst: ahash_crypto_instance(inst));
759}
760EXPORT_SYMBOL_GPL(ahash_register_instance);
761
762bool crypto_hash_alg_has_setkey(struct hash_alg_common *halg)
763{
764 struct crypto_alg *alg = &halg->base;
765
766 if (alg->cra_type == &crypto_shash_type)
767 return crypto_shash_alg_has_setkey(alg: __crypto_shash_alg(alg));
768
769 return __crypto_ahash_alg(alg)->setkey != ahash_nosetkey;
770}
771EXPORT_SYMBOL_GPL(crypto_hash_alg_has_setkey);
772
773MODULE_LICENSE("GPL");
774MODULE_DESCRIPTION("Asynchronous cryptographic hash type");
775

source code of linux/crypto/ahash.c