lib/group_cpus.c: avoid acquiring cpu hotplug lock in group_cpus_evenly
[platform/kernel/linux-starfive.git] / crypto / shash.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Synchronous Cryptographic Hash operations.
4  *
5  * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
6  */
7
8 #include <crypto/scatterwalk.h>
9 #include <linux/cryptouser.h>
10 #include <linux/err.h>
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/seq_file.h>
15 #include <linux/string.h>
16 #include <net/netlink.h>
17
18 #include "hash.h"
19
20 #define MAX_SHASH_ALIGNMASK 63
21
22 static const struct crypto_type crypto_shash_type;
23
24 static inline struct crypto_istat_hash *shash_get_stat(struct shash_alg *alg)
25 {
26         return hash_get_stat(&alg->halg);
27 }
28
29 static inline int crypto_shash_errstat(struct shash_alg *alg, int err)
30 {
31         return crypto_hash_errstat(&alg->halg, err);
32 }
33
34 int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
35                     unsigned int keylen)
36 {
37         return -ENOSYS;
38 }
39 EXPORT_SYMBOL_GPL(shash_no_setkey);
40
41 static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
42                                   unsigned int keylen)
43 {
44         struct shash_alg *shash = crypto_shash_alg(tfm);
45         unsigned long alignmask = crypto_shash_alignmask(tfm);
46         unsigned long absize;
47         u8 *buffer, *alignbuffer;
48         int err;
49
50         absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
51         buffer = kmalloc(absize, GFP_ATOMIC);
52         if (!buffer)
53                 return -ENOMEM;
54
55         alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
56         memcpy(alignbuffer, key, keylen);
57         err = shash->setkey(tfm, alignbuffer, keylen);
58         kfree_sensitive(buffer);
59         return err;
60 }
61
62 static void shash_set_needkey(struct crypto_shash *tfm, struct shash_alg *alg)
63 {
64         if (crypto_shash_alg_needs_key(alg))
65                 crypto_shash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
66 }
67
68 int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
69                         unsigned int keylen)
70 {
71         struct shash_alg *shash = crypto_shash_alg(tfm);
72         unsigned long alignmask = crypto_shash_alignmask(tfm);
73         int err;
74
75         if ((unsigned long)key & alignmask)
76                 err = shash_setkey_unaligned(tfm, key, keylen);
77         else
78                 err = shash->setkey(tfm, key, keylen);
79
80         if (unlikely(err)) {
81                 shash_set_needkey(tfm, shash);
82                 return err;
83         }
84
85         crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
86         return 0;
87 }
88 EXPORT_SYMBOL_GPL(crypto_shash_setkey);
89
90 static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
91                                   unsigned int len)
92 {
93         struct crypto_shash *tfm = desc->tfm;
94         struct shash_alg *shash = crypto_shash_alg(tfm);
95         unsigned long alignmask = crypto_shash_alignmask(tfm);
96         unsigned int unaligned_len = alignmask + 1 -
97                                      ((unsigned long)data & alignmask);
98         /*
99          * We cannot count on __aligned() working for large values:
100          * https://patchwork.kernel.org/patch/9507697/
101          */
102         u8 ubuf[MAX_SHASH_ALIGNMASK * 2];
103         u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
104         int err;
105
106         if (WARN_ON(buf + unaligned_len > ubuf + sizeof(ubuf)))
107                 return -EINVAL;
108
109         if (unaligned_len > len)
110                 unaligned_len = len;
111
112         memcpy(buf, data, unaligned_len);
113         err = shash->update(desc, buf, unaligned_len);
114         memset(buf, 0, unaligned_len);
115
116         return err ?:
117                shash->update(desc, data + unaligned_len, len - unaligned_len);
118 }
119
120 int crypto_shash_update(struct shash_desc *desc, const u8 *data,
121                         unsigned int len)
122 {
123         struct crypto_shash *tfm = desc->tfm;
124         struct shash_alg *shash = crypto_shash_alg(tfm);
125         unsigned long alignmask = crypto_shash_alignmask(tfm);
126         int err;
127
128         if (IS_ENABLED(CONFIG_CRYPTO_STATS))
129                 atomic64_add(len, &shash_get_stat(shash)->hash_tlen);
130
131         if ((unsigned long)data & alignmask)
132                 err = shash_update_unaligned(desc, data, len);
133         else
134                 err = shash->update(desc, data, len);
135
136         return crypto_shash_errstat(shash, err);
137 }
138 EXPORT_SYMBOL_GPL(crypto_shash_update);
139
140 static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
141 {
142         struct crypto_shash *tfm = desc->tfm;
143         unsigned long alignmask = crypto_shash_alignmask(tfm);
144         struct shash_alg *shash = crypto_shash_alg(tfm);
145         unsigned int ds = crypto_shash_digestsize(tfm);
146         /*
147          * We cannot count on __aligned() working for large values:
148          * https://patchwork.kernel.org/patch/9507697/
149          */
150         u8 ubuf[MAX_SHASH_ALIGNMASK + HASH_MAX_DIGESTSIZE];
151         u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
152         int err;
153
154         if (WARN_ON(buf + ds > ubuf + sizeof(ubuf)))
155                 return -EINVAL;
156
157         err = shash->final(desc, buf);
158         if (err)
159                 goto out;
160
161         memcpy(out, buf, ds);
162
163 out:
164         memset(buf, 0, ds);
165         return err;
166 }
167
168 int crypto_shash_final(struct shash_desc *desc, u8 *out)
169 {
170         struct crypto_shash *tfm = desc->tfm;
171         struct shash_alg *shash = crypto_shash_alg(tfm);
172         unsigned long alignmask = crypto_shash_alignmask(tfm);
173         int err;
174
175         if (IS_ENABLED(CONFIG_CRYPTO_STATS))
176                 atomic64_inc(&shash_get_stat(shash)->hash_cnt);
177
178         if ((unsigned long)out & alignmask)
179                 err = shash_final_unaligned(desc, out);
180         else
181                 err = shash->final(desc, out);
182
183         return crypto_shash_errstat(shash, err);
184 }
185 EXPORT_SYMBOL_GPL(crypto_shash_final);
186
187 static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
188                                  unsigned int len, u8 *out)
189 {
190         return shash_update_unaligned(desc, data, len) ?:
191                shash_final_unaligned(desc, out);
192 }
193
194 int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
195                        unsigned int len, u8 *out)
196 {
197         struct crypto_shash *tfm = desc->tfm;
198         struct shash_alg *shash = crypto_shash_alg(tfm);
199         unsigned long alignmask = crypto_shash_alignmask(tfm);
200         int err;
201
202         if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
203                 struct crypto_istat_hash *istat = shash_get_stat(shash);
204
205                 atomic64_inc(&istat->hash_cnt);
206                 atomic64_add(len, &istat->hash_tlen);
207         }
208
209         if (((unsigned long)data | (unsigned long)out) & alignmask)
210                 err = shash_finup_unaligned(desc, data, len, out);
211         else
212                 err = shash->finup(desc, data, len, out);
213
214
215         return crypto_shash_errstat(shash, err);
216 }
217 EXPORT_SYMBOL_GPL(crypto_shash_finup);
218
219 static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
220                                   unsigned int len, u8 *out)
221 {
222         return crypto_shash_init(desc) ?:
223                shash_update_unaligned(desc, data, len) ?:
224                shash_final_unaligned(desc, out);
225 }
226
227 int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
228                         unsigned int len, u8 *out)
229 {
230         struct crypto_shash *tfm = desc->tfm;
231         struct shash_alg *shash = crypto_shash_alg(tfm);
232         unsigned long alignmask = crypto_shash_alignmask(tfm);
233         int err;
234
235         if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
236                 struct crypto_istat_hash *istat = shash_get_stat(shash);
237
238                 atomic64_inc(&istat->hash_cnt);
239                 atomic64_add(len, &istat->hash_tlen);
240         }
241
242         if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
243                 err = -ENOKEY;
244         else if (((unsigned long)data | (unsigned long)out) & alignmask)
245                 err = shash_digest_unaligned(desc, data, len, out);
246         else
247                 err = shash->digest(desc, data, len, out);
248
249         return crypto_shash_errstat(shash, err);
250 }
251 EXPORT_SYMBOL_GPL(crypto_shash_digest);
252
253 int crypto_shash_tfm_digest(struct crypto_shash *tfm, const u8 *data,
254                             unsigned int len, u8 *out)
255 {
256         SHASH_DESC_ON_STACK(desc, tfm);
257         int err;
258
259         desc->tfm = tfm;
260
261         err = crypto_shash_digest(desc, data, len, out);
262
263         shash_desc_zero(desc);
264
265         return err;
266 }
267 EXPORT_SYMBOL_GPL(crypto_shash_tfm_digest);
268
269 static int shash_default_export(struct shash_desc *desc, void *out)
270 {
271         memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
272         return 0;
273 }
274
275 static int shash_default_import(struct shash_desc *desc, const void *in)
276 {
277         memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
278         return 0;
279 }
280
281 static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
282                               unsigned int keylen)
283 {
284         struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
285
286         return crypto_shash_setkey(*ctx, key, keylen);
287 }
288
289 static int shash_async_init(struct ahash_request *req)
290 {
291         struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
292         struct shash_desc *desc = ahash_request_ctx(req);
293
294         desc->tfm = *ctx;
295
296         return crypto_shash_init(desc);
297 }
298
299 int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
300 {
301         struct crypto_hash_walk walk;
302         int nbytes;
303
304         for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
305              nbytes = crypto_hash_walk_done(&walk, nbytes))
306                 nbytes = crypto_shash_update(desc, walk.data, nbytes);
307
308         return nbytes;
309 }
310 EXPORT_SYMBOL_GPL(shash_ahash_update);
311
312 static int shash_async_update(struct ahash_request *req)
313 {
314         return shash_ahash_update(req, ahash_request_ctx(req));
315 }
316
317 static int shash_async_final(struct ahash_request *req)
318 {
319         return crypto_shash_final(ahash_request_ctx(req), req->result);
320 }
321
322 int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
323 {
324         struct crypto_hash_walk walk;
325         int nbytes;
326
327         nbytes = crypto_hash_walk_first(req, &walk);
328         if (!nbytes)
329                 return crypto_shash_final(desc, req->result);
330
331         do {
332                 nbytes = crypto_hash_walk_last(&walk) ?
333                          crypto_shash_finup(desc, walk.data, nbytes,
334                                             req->result) :
335                          crypto_shash_update(desc, walk.data, nbytes);
336                 nbytes = crypto_hash_walk_done(&walk, nbytes);
337         } while (nbytes > 0);
338
339         return nbytes;
340 }
341 EXPORT_SYMBOL_GPL(shash_ahash_finup);
342
343 static int shash_async_finup(struct ahash_request *req)
344 {
345         struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
346         struct shash_desc *desc = ahash_request_ctx(req);
347
348         desc->tfm = *ctx;
349
350         return shash_ahash_finup(req, desc);
351 }
352
353 int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
354 {
355         unsigned int nbytes = req->nbytes;
356         struct scatterlist *sg;
357         unsigned int offset;
358         int err;
359
360         if (nbytes &&
361             (sg = req->src, offset = sg->offset,
362              nbytes <= min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
363                 void *data;
364
365                 data = kmap_local_page(sg_page(sg));
366                 err = crypto_shash_digest(desc, data + offset, nbytes,
367                                           req->result);
368                 kunmap_local(data);
369         } else
370                 err = crypto_shash_init(desc) ?:
371                       shash_ahash_finup(req, desc);
372
373         return err;
374 }
375 EXPORT_SYMBOL_GPL(shash_ahash_digest);
376
377 static int shash_async_digest(struct ahash_request *req)
378 {
379         struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
380         struct shash_desc *desc = ahash_request_ctx(req);
381
382         desc->tfm = *ctx;
383
384         return shash_ahash_digest(req, desc);
385 }
386
387 static int shash_async_export(struct ahash_request *req, void *out)
388 {
389         return crypto_shash_export(ahash_request_ctx(req), out);
390 }
391
392 static int shash_async_import(struct ahash_request *req, const void *in)
393 {
394         struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
395         struct shash_desc *desc = ahash_request_ctx(req);
396
397         desc->tfm = *ctx;
398
399         return crypto_shash_import(desc, in);
400 }
401
402 static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
403 {
404         struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
405
406         crypto_free_shash(*ctx);
407 }
408
409 int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
410 {
411         struct crypto_alg *calg = tfm->__crt_alg;
412         struct shash_alg *alg = __crypto_shash_alg(calg);
413         struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
414         struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
415         struct crypto_shash *shash;
416
417         if (!crypto_mod_get(calg))
418                 return -EAGAIN;
419
420         shash = crypto_create_tfm(calg, &crypto_shash_type);
421         if (IS_ERR(shash)) {
422                 crypto_mod_put(calg);
423                 return PTR_ERR(shash);
424         }
425
426         *ctx = shash;
427         tfm->exit = crypto_exit_shash_ops_async;
428
429         crt->init = shash_async_init;
430         crt->update = shash_async_update;
431         crt->final = shash_async_final;
432         crt->finup = shash_async_finup;
433         crt->digest = shash_async_digest;
434         if (crypto_shash_alg_has_setkey(alg))
435                 crt->setkey = shash_async_setkey;
436
437         crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
438                                     CRYPTO_TFM_NEED_KEY);
439
440         crt->export = shash_async_export;
441         crt->import = shash_async_import;
442
443         crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
444
445         return 0;
446 }
447
448 struct crypto_ahash *crypto_clone_shash_ops_async(struct crypto_ahash *nhash,
449                                                   struct crypto_ahash *hash)
450 {
451         struct crypto_shash **nctx = crypto_ahash_ctx(nhash);
452         struct crypto_shash **ctx = crypto_ahash_ctx(hash);
453         struct crypto_shash *shash;
454
455         shash = crypto_clone_shash(*ctx);
456         if (IS_ERR(shash)) {
457                 crypto_free_ahash(nhash);
458                 return ERR_CAST(shash);
459         }
460
461         *nctx = shash;
462
463         return nhash;
464 }
465
466 static void crypto_shash_exit_tfm(struct crypto_tfm *tfm)
467 {
468         struct crypto_shash *hash = __crypto_shash_cast(tfm);
469         struct shash_alg *alg = crypto_shash_alg(hash);
470
471         alg->exit_tfm(hash);
472 }
473
474 static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
475 {
476         struct crypto_shash *hash = __crypto_shash_cast(tfm);
477         struct shash_alg *alg = crypto_shash_alg(hash);
478         int err;
479
480         hash->descsize = alg->descsize;
481
482         shash_set_needkey(hash, alg);
483
484         if (alg->exit_tfm)
485                 tfm->exit = crypto_shash_exit_tfm;
486
487         if (!alg->init_tfm)
488                 return 0;
489
490         err = alg->init_tfm(hash);
491         if (err)
492                 return err;
493
494         /* ->init_tfm() may have increased the descsize. */
495         if (WARN_ON_ONCE(hash->descsize > HASH_MAX_DESCSIZE)) {
496                 if (alg->exit_tfm)
497                         alg->exit_tfm(hash);
498                 return -EINVAL;
499         }
500
501         return 0;
502 }
503
504 static void crypto_shash_free_instance(struct crypto_instance *inst)
505 {
506         struct shash_instance *shash = shash_instance(inst);
507
508         shash->free(shash);
509 }
510
511 static int __maybe_unused crypto_shash_report(
512         struct sk_buff *skb, struct crypto_alg *alg)
513 {
514         struct crypto_report_hash rhash;
515         struct shash_alg *salg = __crypto_shash_alg(alg);
516
517         memset(&rhash, 0, sizeof(rhash));
518
519         strscpy(rhash.type, "shash", sizeof(rhash.type));
520
521         rhash.blocksize = alg->cra_blocksize;
522         rhash.digestsize = salg->digestsize;
523
524         return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
525 }
526
527 static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
528         __maybe_unused;
529 static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
530 {
531         struct shash_alg *salg = __crypto_shash_alg(alg);
532
533         seq_printf(m, "type         : shash\n");
534         seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
535         seq_printf(m, "digestsize   : %u\n", salg->digestsize);
536 }
537
538 static int __maybe_unused crypto_shash_report_stat(
539         struct sk_buff *skb, struct crypto_alg *alg)
540 {
541         return crypto_hash_report_stat(skb, alg, "shash");
542 }
543
544 static const struct crypto_type crypto_shash_type = {
545         .extsize = crypto_alg_extsize,
546         .init_tfm = crypto_shash_init_tfm,
547         .free = crypto_shash_free_instance,
548 #ifdef CONFIG_PROC_FS
549         .show = crypto_shash_show,
550 #endif
551 #if IS_ENABLED(CONFIG_CRYPTO_USER)
552         .report = crypto_shash_report,
553 #endif
554 #ifdef CONFIG_CRYPTO_STATS
555         .report_stat = crypto_shash_report_stat,
556 #endif
557         .maskclear = ~CRYPTO_ALG_TYPE_MASK,
558         .maskset = CRYPTO_ALG_TYPE_MASK,
559         .type = CRYPTO_ALG_TYPE_SHASH,
560         .tfmsize = offsetof(struct crypto_shash, base),
561 };
562
563 int crypto_grab_shash(struct crypto_shash_spawn *spawn,
564                       struct crypto_instance *inst,
565                       const char *name, u32 type, u32 mask)
566 {
567         spawn->base.frontend = &crypto_shash_type;
568         return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
569 }
570 EXPORT_SYMBOL_GPL(crypto_grab_shash);
571
572 struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
573                                         u32 mask)
574 {
575         return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
576 }
577 EXPORT_SYMBOL_GPL(crypto_alloc_shash);
578
579 int crypto_has_shash(const char *alg_name, u32 type, u32 mask)
580 {
581         return crypto_type_has_alg(alg_name, &crypto_shash_type, type, mask);
582 }
583 EXPORT_SYMBOL_GPL(crypto_has_shash);
584
585 struct crypto_shash *crypto_clone_shash(struct crypto_shash *hash)
586 {
587         struct crypto_tfm *tfm = crypto_shash_tfm(hash);
588         struct shash_alg *alg = crypto_shash_alg(hash);
589         struct crypto_shash *nhash;
590         int err;
591
592         if (!crypto_shash_alg_has_setkey(alg)) {
593                 tfm = crypto_tfm_get(tfm);
594                 if (IS_ERR(tfm))
595                         return ERR_CAST(tfm);
596
597                 return hash;
598         }
599
600         if (!alg->clone_tfm && (alg->init_tfm || alg->base.cra_init))
601                 return ERR_PTR(-ENOSYS);
602
603         nhash = crypto_clone_tfm(&crypto_shash_type, tfm);
604         if (IS_ERR(nhash))
605                 return nhash;
606
607         nhash->descsize = hash->descsize;
608
609         if (alg->clone_tfm) {
610                 err = alg->clone_tfm(nhash, hash);
611                 if (err) {
612                         crypto_free_shash(nhash);
613                         return ERR_PTR(err);
614                 }
615         }
616
617         return nhash;
618 }
619 EXPORT_SYMBOL_GPL(crypto_clone_shash);
620
621 int hash_prepare_alg(struct hash_alg_common *alg)
622 {
623         struct crypto_istat_hash *istat = hash_get_stat(alg);
624         struct crypto_alg *base = &alg->base;
625
626         if (alg->digestsize > HASH_MAX_DIGESTSIZE)
627                 return -EINVAL;
628
629         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
630
631         if (IS_ENABLED(CONFIG_CRYPTO_STATS))
632                 memset(istat, 0, sizeof(*istat));
633
634         return 0;
635 }
636
637 static int shash_prepare_alg(struct shash_alg *alg)
638 {
639         struct crypto_alg *base = &alg->halg.base;
640         int err;
641
642         if (alg->descsize > HASH_MAX_DESCSIZE)
643                 return -EINVAL;
644
645         if (base->cra_alignmask > MAX_SHASH_ALIGNMASK)
646                 return -EINVAL;
647
648         if ((alg->export && !alg->import) || (alg->import && !alg->export))
649                 return -EINVAL;
650
651         err = hash_prepare_alg(&alg->halg);
652         if (err)
653                 return err;
654
655         base->cra_type = &crypto_shash_type;
656         base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
657
658         if (!alg->finup)
659                 alg->finup = shash_finup_unaligned;
660         if (!alg->digest)
661                 alg->digest = shash_digest_unaligned;
662         if (!alg->export) {
663                 alg->export = shash_default_export;
664                 alg->import = shash_default_import;
665                 alg->halg.statesize = alg->descsize;
666         }
667         if (!alg->setkey)
668                 alg->setkey = shash_no_setkey;
669
670         return 0;
671 }
672
673 int crypto_register_shash(struct shash_alg *alg)
674 {
675         struct crypto_alg *base = &alg->base;
676         int err;
677
678         err = shash_prepare_alg(alg);
679         if (err)
680                 return err;
681
682         return crypto_register_alg(base);
683 }
684 EXPORT_SYMBOL_GPL(crypto_register_shash);
685
686 void crypto_unregister_shash(struct shash_alg *alg)
687 {
688         crypto_unregister_alg(&alg->base);
689 }
690 EXPORT_SYMBOL_GPL(crypto_unregister_shash);
691
692 int crypto_register_shashes(struct shash_alg *algs, int count)
693 {
694         int i, ret;
695
696         for (i = 0; i < count; i++) {
697                 ret = crypto_register_shash(&algs[i]);
698                 if (ret)
699                         goto err;
700         }
701
702         return 0;
703
704 err:
705         for (--i; i >= 0; --i)
706                 crypto_unregister_shash(&algs[i]);
707
708         return ret;
709 }
710 EXPORT_SYMBOL_GPL(crypto_register_shashes);
711
712 void crypto_unregister_shashes(struct shash_alg *algs, int count)
713 {
714         int i;
715
716         for (i = count - 1; i >= 0; --i)
717                 crypto_unregister_shash(&algs[i]);
718 }
719 EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
720
721 int shash_register_instance(struct crypto_template *tmpl,
722                             struct shash_instance *inst)
723 {
724         int err;
725
726         if (WARN_ON(!inst->free))
727                 return -EINVAL;
728
729         err = shash_prepare_alg(&inst->alg);
730         if (err)
731                 return err;
732
733         return crypto_register_instance(tmpl, shash_crypto_instance(inst));
734 }
735 EXPORT_SYMBOL_GPL(shash_register_instance);
736
737 void shash_free_singlespawn_instance(struct shash_instance *inst)
738 {
739         crypto_drop_spawn(shash_instance_ctx(inst));
740         kfree(inst);
741 }
742 EXPORT_SYMBOL_GPL(shash_free_singlespawn_instance);
743
744 MODULE_LICENSE("GPL");
745 MODULE_DESCRIPTION("Synchronous cryptographic hash type");