io_uring: free io_buffer_list entries via RCU
[platform/kernel/linux-starfive.git] / 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");