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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/internal/hash.h>
12#include <crypto/scatterwalk.h>
13#include <linux/bug.h>
14#include <linux/err.h>
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/sched.h>
18#include <linux/slab.h>
19#include <linux/seq_file.h>
20#include <linux/cryptouser.h>
21#include <linux/compiler.h>
22#include <net/netlink.h>
23
24#include "internal.h"
25
26struct 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
34static inline struct ahash_alg *crypto_ahash_alg(struct crypto_ahash *hash)
35{
36 return container_of(crypto_hash_alg_common(hash), struct ahash_alg,
37 halg);
38}
39
40static int hash_walk_next(struct crypto_hash_walk *walk)
41{
42 unsigned int alignmask = walk->alignmask;
43 unsigned int offset = walk->offset;
44 unsigned int nbytes = min(walk->entrylen,
45 ((unsigned int)(PAGE_SIZE)) - offset);
46
47 if (walk->flags & CRYPTO_ALG_ASYNC)
48 walk->data = kmap(walk->pg);
49 else
50 walk->data = kmap_atomic(walk->pg);
51 walk->data += offset;
52
53 if (offset & alignmask) {
54 unsigned int unaligned = alignmask + 1 - (offset & alignmask);
55
56 if (nbytes > unaligned)
57 nbytes = unaligned;
58 }
59
60 walk->entrylen -= nbytes;
61 return nbytes;
62}
63
64static int hash_walk_new_entry(struct crypto_hash_walk *walk)
65{
66 struct scatterlist *sg;
67
68 sg = walk->sg;
69 walk->offset = sg->offset;
70 walk->pg = sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
71 walk->offset = offset_in_page(walk->offset);
72 walk->entrylen = sg->length;
73
74 if (walk->entrylen > walk->total)
75 walk->entrylen = walk->total;
76 walk->total -= walk->entrylen;
77
78 return hash_walk_next(walk);
79}
80
81int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
82{
83 unsigned int alignmask = walk->alignmask;
84
85 walk->data -= walk->offset;
86
87 if (walk->entrylen && (walk->offset & alignmask) && !err) {
88 unsigned int nbytes;
89
90 walk->offset = ALIGN(walk->offset, alignmask + 1);
91 nbytes = min(walk->entrylen,
92 (unsigned int)(PAGE_SIZE - walk->offset));
93 if (nbytes) {
94 walk->entrylen -= nbytes;
95 walk->data += walk->offset;
96 return nbytes;
97 }
98 }
99
100 if (walk->flags & CRYPTO_ALG_ASYNC)
101 kunmap(walk->pg);
102 else {
103 kunmap_atomic(walk->data);
104 /*
105 * The may sleep test only makes sense for sync users.
106 * Async users don't need to sleep here anyway.
107 */
108 crypto_yield(walk->flags);
109 }
110
111 if (err)
112 return err;
113
114 if (walk->entrylen) {
115 walk->offset = 0;
116 walk->pg++;
117 return hash_walk_next(walk);
118 }
119
120 if (!walk->total)
121 return 0;
122
123 walk->sg = sg_next(walk->sg);
124
125 return hash_walk_new_entry(walk);
126}
127EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
128
129int crypto_hash_walk_first(struct ahash_request *req,
130 struct crypto_hash_walk *walk)
131{
132 walk->total = req->nbytes;
133
134 if (!walk->total) {
135 walk->entrylen = 0;
136 return 0;
137 }
138
139 walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
140 walk->sg = req->src;
141 walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK;
142
143 return hash_walk_new_entry(walk);
144}
145EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
146
147int crypto_ahash_walk_first(struct ahash_request *req,
148 struct crypto_hash_walk *walk)
149{
150 walk->total = req->nbytes;
151
152 if (!walk->total) {
153 walk->entrylen = 0;
154 return 0;
155 }
156
157 walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
158 walk->sg = req->src;
159 walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK;
160 walk->flags |= CRYPTO_ALG_ASYNC;
161
162 BUILD_BUG_ON(CRYPTO_TFM_REQ_MASK & CRYPTO_ALG_ASYNC);
163
164 return hash_walk_new_entry(walk);
165}
166EXPORT_SYMBOL_GPL(crypto_ahash_walk_first);
167
168static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
169 unsigned int keylen)
170{
171 unsigned long alignmask = crypto_ahash_alignmask(tfm);
172 int ret;
173 u8 *buffer, *alignbuffer;
174 unsigned long absize;
175
176 absize = keylen + alignmask;
177 buffer = kmalloc(absize, GFP_KERNEL);
178 if (!buffer)
179 return -ENOMEM;
180
181 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
182 memcpy(alignbuffer, key, keylen);
183 ret = tfm->setkey(tfm, alignbuffer, keylen);
184 kzfree(buffer);
185 return ret;
186}
187
188static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
189 unsigned int keylen)
190{
191 return -ENOSYS;
192}
193
194static void ahash_set_needkey(struct crypto_ahash *tfm)
195{
196 const struct hash_alg_common *alg = crypto_hash_alg_common(tfm);
197
198 if (tfm->setkey != ahash_nosetkey &&
199 !(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
200 crypto_ahash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
201}
202
203int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
204 unsigned int keylen)
205{
206 unsigned long alignmask = crypto_ahash_alignmask(tfm);
207 int err;
208
209 if ((unsigned long)key & alignmask)
210 err = ahash_setkey_unaligned(tfm, key, keylen);
211 else
212 err = tfm->setkey(tfm, key, keylen);
213
214 if (unlikely(err)) {
215 ahash_set_needkey(tfm);
216 return err;
217 }
218
219 crypto_ahash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
220 return 0;
221}
222EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
223
224static inline unsigned int ahash_align_buffer_size(unsigned len,
225 unsigned long mask)
226{
227 return len + (mask & ~(crypto_tfm_ctx_alignment() - 1));
228}
229
230static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt)
231{
232 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
233 unsigned long alignmask = crypto_ahash_alignmask(tfm);
234 unsigned int ds = crypto_ahash_digestsize(tfm);
235 struct ahash_request_priv *priv;
236
237 priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
238 (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
239 GFP_KERNEL : GFP_ATOMIC);
240 if (!priv)
241 return -ENOMEM;
242
243 /*
244 * WARNING: Voodoo programming below!
245 *
246 * The code below is obscure and hard to understand, thus explanation
247 * is necessary. See include/crypto/hash.h and include/linux/crypto.h
248 * to understand the layout of structures used here!
249 *
250 * The code here will replace portions of the ORIGINAL request with
251 * pointers to new code and buffers so the hashing operation can store
252 * the result in aligned buffer. We will call the modified request
253 * an ADJUSTED request.
254 *
255 * The newly mangled request will look as such:
256 *
257 * req {
258 * .result = ADJUSTED[new aligned buffer]
259 * .base.complete = ADJUSTED[pointer to completion function]
260 * .base.data = ADJUSTED[*req (pointer to self)]
261 * .priv = ADJUSTED[new priv] {
262 * .result = ORIGINAL(result)
263 * .complete = ORIGINAL(base.complete)
264 * .data = ORIGINAL(base.data)
265 * }
266 */
267
268 priv->result = req->result;
269 priv->complete = req->base.complete;
270 priv->data = req->base.data;
271 priv->flags = req->base.flags;
272
273 /*
274 * WARNING: We do not backup req->priv here! The req->priv
275 * is for internal use of the Crypto API and the
276 * user must _NOT_ _EVER_ depend on it's content!
277 */
278
279 req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
280 req->base.complete = cplt;
281 req->base.data = req;
282 req->priv = priv;
283
284 return 0;
285}
286
287static void ahash_restore_req(struct ahash_request *req, int err)
288{
289 struct ahash_request_priv *priv = req->priv;
290
291 if (!err)
292 memcpy(priv->result, req->result,
293 crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
294
295 /* Restore the original crypto request. */
296 req->result = priv->result;
297
298 ahash_request_set_callback(req, priv->flags,
299 priv->complete, priv->data);
300 req->priv = NULL;
301
302 /* Free the req->priv.priv from the ADJUSTED request. */
303 kzfree(priv);
304}
305
306static void ahash_notify_einprogress(struct ahash_request *req)
307{
308 struct ahash_request_priv *priv = req->priv;
309 struct crypto_async_request oreq;
310
311 oreq.data = priv->data;
312
313 priv->complete(&oreq, -EINPROGRESS);
314}
315
316static void ahash_op_unaligned_done(struct crypto_async_request *req, int err)
317{
318 struct ahash_request *areq = req->data;
319
320 if (err == -EINPROGRESS) {
321 ahash_notify_einprogress(areq);
322 return;
323 }
324
325 /*
326 * Restore the original request, see ahash_op_unaligned() for what
327 * goes where.
328 *
329 * The "struct ahash_request *req" here is in fact the "req.base"
330 * from the ADJUSTED request from ahash_op_unaligned(), thus as it
331 * is a pointer to self, it is also the ADJUSTED "req" .
332 */
333
334 /* First copy req->result into req->priv.result */
335 ahash_restore_req(areq, err);
336
337 /* Complete the ORIGINAL request. */
338 areq->base.complete(&areq->base, err);
339}
340
341static int ahash_op_unaligned(struct ahash_request *req,
342 int (*op)(struct ahash_request *))
343{
344 int err;
345
346 err = ahash_save_req(req, ahash_op_unaligned_done);
347 if (err)
348 return err;
349
350 err = op(req);
351 if (err == -EINPROGRESS || err == -EBUSY)
352 return err;
353
354 ahash_restore_req(req, err);
355
356 return err;
357}
358
359static int crypto_ahash_op(struct ahash_request *req,
360 int (*op)(struct ahash_request *))
361{
362 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
363 unsigned long alignmask = crypto_ahash_alignmask(tfm);
364
365 if ((unsigned long)req->result & alignmask)
366 return ahash_op_unaligned(req, op);
367
368 return op(req);
369}
370
371int crypto_ahash_final(struct ahash_request *req)
372{
373 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
374 struct crypto_alg *alg = tfm->base.__crt_alg;
375 unsigned int nbytes = req->nbytes;
376 int ret;
377
378 crypto_stats_get(alg);
379 ret = crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
380 crypto_stats_ahash_final(nbytes, ret, alg);
381 return ret;
382}
383EXPORT_SYMBOL_GPL(crypto_ahash_final);
384
385int crypto_ahash_finup(struct ahash_request *req)
386{
387 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
388 struct crypto_alg *alg = tfm->base.__crt_alg;
389 unsigned int nbytes = req->nbytes;
390 int ret;
391
392 crypto_stats_get(alg);
393 ret = crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
394 crypto_stats_ahash_final(nbytes, ret, alg);
395 return ret;
396}
397EXPORT_SYMBOL_GPL(crypto_ahash_finup);
398
399int crypto_ahash_digest(struct ahash_request *req)
400{
401 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
402 struct crypto_alg *alg = tfm->base.__crt_alg;
403 unsigned int nbytes = req->nbytes;
404 int ret;
405
406 crypto_stats_get(alg);
407 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
408 ret = -ENOKEY;
409 else
410 ret = crypto_ahash_op(req, tfm->digest);
411 crypto_stats_ahash_final(nbytes, ret, alg);
412 return ret;
413}
414EXPORT_SYMBOL_GPL(crypto_ahash_digest);
415
416static void ahash_def_finup_done2(struct crypto_async_request *req, int err)
417{
418 struct ahash_request *areq = req->data;
419
420 if (err == -EINPROGRESS)
421 return;
422
423 ahash_restore_req(areq, err);
424
425 areq->base.complete(&areq->base, err);
426}
427
428static int ahash_def_finup_finish1(struct ahash_request *req, int err)
429{
430 if (err)
431 goto out;
432
433 req->base.complete = ahash_def_finup_done2;
434
435 err = crypto_ahash_reqtfm(req)->final(req);
436 if (err == -EINPROGRESS || err == -EBUSY)
437 return err;
438
439out:
440 ahash_restore_req(req, err);
441 return err;
442}
443
444static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
445{
446 struct ahash_request *areq = req->data;
447
448 if (err == -EINPROGRESS) {
449 ahash_notify_einprogress(areq);
450 return;
451 }
452
453 areq->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
454
455 err = ahash_def_finup_finish1(areq, err);
456 if (areq->priv)
457 return;
458
459 areq->base.complete(&areq->base, err);
460}
461
462static int ahash_def_finup(struct ahash_request *req)
463{
464 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
465 int err;
466
467 err = ahash_save_req(req, ahash_def_finup_done1);
468 if (err)
469 return err;
470
471 err = tfm->update(req);
472 if (err == -EINPROGRESS || err == -EBUSY)
473 return err;
474
475 return ahash_def_finup_finish1(req, err);
476}
477
478static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
479{
480 struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
481 struct ahash_alg *alg = crypto_ahash_alg(hash);
482
483 hash->setkey = ahash_nosetkey;
484
485 if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
486 return crypto_init_shash_ops_async(tfm);
487
488 hash->init = alg->init;
489 hash->update = alg->update;
490 hash->final = alg->final;
491 hash->finup = alg->finup ?: ahash_def_finup;
492 hash->digest = alg->digest;
493 hash->export = alg->export;
494 hash->import = alg->import;
495
496 if (alg->setkey) {
497 hash->setkey = alg->setkey;
498 ahash_set_needkey(hash);
499 }
500
501 return 0;
502}
503
504static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
505{
506 if (alg->cra_type != &crypto_ahash_type)
507 return sizeof(struct crypto_shash *);
508
509 return crypto_alg_extsize(alg);
510}
511
512#ifdef CONFIG_NET
513static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
514{
515 struct crypto_report_hash rhash;
516
517 memset(&rhash, 0, sizeof(rhash));
518
519 strscpy(rhash.type, "ahash", sizeof(rhash.type));
520
521 rhash.blocksize = alg->cra_blocksize;
522 rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
523
524 return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
525}
526#else
527static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
528{
529 return -ENOSYS;
530}
531#endif
532
533static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
534 __maybe_unused;
535static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
536{
537 seq_printf(m, "type : ahash\n");
538 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
539 "yes" : "no");
540 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
541 seq_printf(m, "digestsize : %u\n",
542 __crypto_hash_alg_common(alg)->digestsize);
543}
544
545const struct crypto_type crypto_ahash_type = {
546 .extsize = crypto_ahash_extsize,
547 .init_tfm = crypto_ahash_init_tfm,
548#ifdef CONFIG_PROC_FS
549 .show = crypto_ahash_show,
550#endif
551 .report = crypto_ahash_report,
552 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
553 .maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
554 .type = CRYPTO_ALG_TYPE_AHASH,
555 .tfmsize = offsetof(struct crypto_ahash, base),
556};
557EXPORT_SYMBOL_GPL(crypto_ahash_type);
558
559struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
560 u32 mask)
561{
562 return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
563}
564EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
565
566int crypto_has_ahash(const char *alg_name, u32 type, u32 mask)
567{
568 return crypto_type_has_alg(alg_name, &crypto_ahash_type, type, mask);
569}
570EXPORT_SYMBOL_GPL(crypto_has_ahash);
571
572static int ahash_prepare_alg(struct ahash_alg *alg)
573{
574 struct crypto_alg *base = &alg->halg.base;
575
576 if (alg->halg.digestsize > HASH_MAX_DIGESTSIZE ||
577 alg->halg.statesize > HASH_MAX_STATESIZE ||
578 alg->halg.statesize == 0)
579 return -EINVAL;
580
581 base->cra_type = &crypto_ahash_type;
582 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
583 base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
584
585 return 0;
586}
587
588int crypto_register_ahash(struct ahash_alg *alg)
589{
590 struct crypto_alg *base = &alg->halg.base;
591 int err;
592
593 err = ahash_prepare_alg(alg);
594 if (err)
595 return err;
596
597 return crypto_register_alg(base);
598}
599EXPORT_SYMBOL_GPL(crypto_register_ahash);
600
601int crypto_unregister_ahash(struct ahash_alg *alg)
602{
603 return crypto_unregister_alg(&alg->halg.base);
604}
605EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
606
607int crypto_register_ahashes(struct ahash_alg *algs, int count)
608{
609 int i, ret;
610
611 for (i = 0; i < count; i++) {
612 ret = crypto_register_ahash(&algs[i]);
613 if (ret)
614 goto err;
615 }
616
617 return 0;
618
619err:
620 for (--i; i >= 0; --i)
621 crypto_unregister_ahash(&algs[i]);
622
623 return ret;
624}
625EXPORT_SYMBOL_GPL(crypto_register_ahashes);
626
627void crypto_unregister_ahashes(struct ahash_alg *algs, int count)
628{
629 int i;
630
631 for (i = count - 1; i >= 0; --i)
632 crypto_unregister_ahash(&algs[i]);
633}
634EXPORT_SYMBOL_GPL(crypto_unregister_ahashes);
635
636int ahash_register_instance(struct crypto_template *tmpl,
637 struct ahash_instance *inst)
638{
639 int err;
640
641 err = ahash_prepare_alg(&inst->alg);
642 if (err)
643 return err;
644
645 return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
646}
647EXPORT_SYMBOL_GPL(ahash_register_instance);
648
649void ahash_free_instance(struct crypto_instance *inst)
650{
651 crypto_drop_spawn(crypto_instance_ctx(inst));
652 kfree(ahash_instance(inst));
653}
654EXPORT_SYMBOL_GPL(ahash_free_instance);
655
656int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn,
657 struct hash_alg_common *alg,
658 struct crypto_instance *inst)
659{
660 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
661 &crypto_ahash_type);
662}
663EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn);
664
665struct hash_alg_common *ahash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
666{
667 struct crypto_alg *alg;
668
669 alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask);
670 return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg);
671}
672EXPORT_SYMBOL_GPL(ahash_attr_alg);
673
674bool crypto_hash_alg_has_setkey(struct hash_alg_common *halg)
675{
676 struct crypto_alg *alg = &halg->base;
677
678 if (alg->cra_type != &crypto_ahash_type)
679 return crypto_shash_alg_has_setkey(__crypto_shash_alg(alg));
680
681 return __crypto_ahash_alg(alg)->setkey != NULL;
682}
683EXPORT_SYMBOL_GPL(crypto_hash_alg_has_setkey);
684
685MODULE_LICENSE("GPL");
686MODULE_DESCRIPTION("Asynchronous cryptographic hash type");
1/*
2 * Asynchronous Cryptographic Hash operations.
3 *
4 * This is the asynchronous version of hash.c with notification of
5 * completion via a callback.
6 *
7 * Copyright (c) 2008 Loc Ho <lho@amcc.com>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the Free
11 * Software Foundation; either version 2 of the License, or (at your option)
12 * any later version.
13 *
14 */
15
16#include <crypto/internal/hash.h>
17#include <crypto/scatterwalk.h>
18#include <linux/bug.h>
19#include <linux/err.h>
20#include <linux/kernel.h>
21#include <linux/module.h>
22#include <linux/sched.h>
23#include <linux/slab.h>
24#include <linux/seq_file.h>
25#include <linux/cryptouser.h>
26#include <net/netlink.h>
27
28#include "internal.h"
29
30struct ahash_request_priv {
31 crypto_completion_t complete;
32 void *data;
33 u8 *result;
34 void *ubuf[] CRYPTO_MINALIGN_ATTR;
35};
36
37static inline struct ahash_alg *crypto_ahash_alg(struct crypto_ahash *hash)
38{
39 return container_of(crypto_hash_alg_common(hash), struct ahash_alg,
40 halg);
41}
42
43static int hash_walk_next(struct crypto_hash_walk *walk)
44{
45 unsigned int alignmask = walk->alignmask;
46 unsigned int offset = walk->offset;
47 unsigned int nbytes = min(walk->entrylen,
48 ((unsigned int)(PAGE_SIZE)) - offset);
49
50 if (walk->flags & CRYPTO_ALG_ASYNC)
51 walk->data = kmap(walk->pg);
52 else
53 walk->data = kmap_atomic(walk->pg);
54 walk->data += offset;
55
56 if (offset & alignmask) {
57 unsigned int unaligned = alignmask + 1 - (offset & alignmask);
58
59 if (nbytes > unaligned)
60 nbytes = unaligned;
61 }
62
63 walk->entrylen -= nbytes;
64 return nbytes;
65}
66
67static int hash_walk_new_entry(struct crypto_hash_walk *walk)
68{
69 struct scatterlist *sg;
70
71 sg = walk->sg;
72 walk->offset = sg->offset;
73 walk->pg = sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
74 walk->offset = offset_in_page(walk->offset);
75 walk->entrylen = sg->length;
76
77 if (walk->entrylen > walk->total)
78 walk->entrylen = walk->total;
79 walk->total -= walk->entrylen;
80
81 return hash_walk_next(walk);
82}
83
84int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
85{
86 unsigned int alignmask = walk->alignmask;
87 unsigned int nbytes = walk->entrylen;
88
89 walk->data -= walk->offset;
90
91 if (nbytes && walk->offset & alignmask && !err) {
92 walk->offset = ALIGN(walk->offset, alignmask + 1);
93 walk->data += walk->offset;
94
95 nbytes = min(nbytes,
96 ((unsigned int)(PAGE_SIZE)) - walk->offset);
97 walk->entrylen -= nbytes;
98
99 return nbytes;
100 }
101
102 if (walk->flags & CRYPTO_ALG_ASYNC)
103 kunmap(walk->pg);
104 else {
105 kunmap_atomic(walk->data);
106 /*
107 * The may sleep test only makes sense for sync users.
108 * Async users don't need to sleep here anyway.
109 */
110 crypto_yield(walk->flags);
111 }
112
113 if (err)
114 return err;
115
116 if (nbytes) {
117 walk->offset = 0;
118 walk->pg++;
119 return hash_walk_next(walk);
120 }
121
122 if (!walk->total)
123 return 0;
124
125 walk->sg = sg_next(walk->sg);
126
127 return hash_walk_new_entry(walk);
128}
129EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
130
131int crypto_hash_walk_first(struct ahash_request *req,
132 struct crypto_hash_walk *walk)
133{
134 walk->total = req->nbytes;
135
136 if (!walk->total) {
137 walk->entrylen = 0;
138 return 0;
139 }
140
141 walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
142 walk->sg = req->src;
143 walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK;
144
145 return hash_walk_new_entry(walk);
146}
147EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
148
149int crypto_ahash_walk_first(struct ahash_request *req,
150 struct crypto_hash_walk *walk)
151{
152 walk->total = req->nbytes;
153
154 if (!walk->total) {
155 walk->entrylen = 0;
156 return 0;
157 }
158
159 walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
160 walk->sg = req->src;
161 walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK;
162 walk->flags |= CRYPTO_ALG_ASYNC;
163
164 BUILD_BUG_ON(CRYPTO_TFM_REQ_MASK & CRYPTO_ALG_ASYNC);
165
166 return hash_walk_new_entry(walk);
167}
168EXPORT_SYMBOL_GPL(crypto_ahash_walk_first);
169
170static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
171 unsigned int keylen)
172{
173 unsigned long alignmask = crypto_ahash_alignmask(tfm);
174 int ret;
175 u8 *buffer, *alignbuffer;
176 unsigned long absize;
177
178 absize = keylen + alignmask;
179 buffer = kmalloc(absize, GFP_KERNEL);
180 if (!buffer)
181 return -ENOMEM;
182
183 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
184 memcpy(alignbuffer, key, keylen);
185 ret = tfm->setkey(tfm, alignbuffer, keylen);
186 kzfree(buffer);
187 return ret;
188}
189
190int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
191 unsigned int keylen)
192{
193 unsigned long alignmask = crypto_ahash_alignmask(tfm);
194
195 if ((unsigned long)key & alignmask)
196 return ahash_setkey_unaligned(tfm, key, keylen);
197
198 return tfm->setkey(tfm, key, keylen);
199}
200EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
201
202static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
203 unsigned int keylen)
204{
205 return -ENOSYS;
206}
207
208static inline unsigned int ahash_align_buffer_size(unsigned len,
209 unsigned long mask)
210{
211 return len + (mask & ~(crypto_tfm_ctx_alignment() - 1));
212}
213
214static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt)
215{
216 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
217 unsigned long alignmask = crypto_ahash_alignmask(tfm);
218 unsigned int ds = crypto_ahash_digestsize(tfm);
219 struct ahash_request_priv *priv;
220
221 priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
222 (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
223 GFP_KERNEL : GFP_ATOMIC);
224 if (!priv)
225 return -ENOMEM;
226
227 /*
228 * WARNING: Voodoo programming below!
229 *
230 * The code below is obscure and hard to understand, thus explanation
231 * is necessary. See include/crypto/hash.h and include/linux/crypto.h
232 * to understand the layout of structures used here!
233 *
234 * The code here will replace portions of the ORIGINAL request with
235 * pointers to new code and buffers so the hashing operation can store
236 * the result in aligned buffer. We will call the modified request
237 * an ADJUSTED request.
238 *
239 * The newly mangled request will look as such:
240 *
241 * req {
242 * .result = ADJUSTED[new aligned buffer]
243 * .base.complete = ADJUSTED[pointer to completion function]
244 * .base.data = ADJUSTED[*req (pointer to self)]
245 * .priv = ADJUSTED[new priv] {
246 * .result = ORIGINAL(result)
247 * .complete = ORIGINAL(base.complete)
248 * .data = ORIGINAL(base.data)
249 * }
250 */
251
252 priv->result = req->result;
253 priv->complete = req->base.complete;
254 priv->data = req->base.data;
255 /*
256 * WARNING: We do not backup req->priv here! The req->priv
257 * is for internal use of the Crypto API and the
258 * user must _NOT_ _EVER_ depend on it's content!
259 */
260
261 req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
262 req->base.complete = cplt;
263 req->base.data = req;
264 req->priv = priv;
265
266 return 0;
267}
268
269static void ahash_restore_req(struct ahash_request *req)
270{
271 struct ahash_request_priv *priv = req->priv;
272
273 /* Restore the original crypto request. */
274 req->result = priv->result;
275 req->base.complete = priv->complete;
276 req->base.data = priv->data;
277 req->priv = NULL;
278
279 /* Free the req->priv.priv from the ADJUSTED request. */
280 kzfree(priv);
281}
282
283static void ahash_op_unaligned_finish(struct ahash_request *req, int err)
284{
285 struct ahash_request_priv *priv = req->priv;
286
287 if (err == -EINPROGRESS)
288 return;
289
290 if (!err)
291 memcpy(priv->result, req->result,
292 crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
293
294 ahash_restore_req(req);
295}
296
297static void ahash_op_unaligned_done(struct crypto_async_request *req, int err)
298{
299 struct ahash_request *areq = req->data;
300
301 /*
302 * Restore the original request, see ahash_op_unaligned() for what
303 * goes where.
304 *
305 * The "struct ahash_request *req" here is in fact the "req.base"
306 * from the ADJUSTED request from ahash_op_unaligned(), thus as it
307 * is a pointer to self, it is also the ADJUSTED "req" .
308 */
309
310 /* First copy req->result into req->priv.result */
311 ahash_op_unaligned_finish(areq, err);
312
313 /* Complete the ORIGINAL request. */
314 areq->base.complete(&areq->base, err);
315}
316
317static int ahash_op_unaligned(struct ahash_request *req,
318 int (*op)(struct ahash_request *))
319{
320 int err;
321
322 err = ahash_save_req(req, ahash_op_unaligned_done);
323 if (err)
324 return err;
325
326 err = op(req);
327 ahash_op_unaligned_finish(req, err);
328
329 return err;
330}
331
332static int crypto_ahash_op(struct ahash_request *req,
333 int (*op)(struct ahash_request *))
334{
335 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
336 unsigned long alignmask = crypto_ahash_alignmask(tfm);
337
338 if ((unsigned long)req->result & alignmask)
339 return ahash_op_unaligned(req, op);
340
341 return op(req);
342}
343
344int crypto_ahash_final(struct ahash_request *req)
345{
346 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
347}
348EXPORT_SYMBOL_GPL(crypto_ahash_final);
349
350int crypto_ahash_finup(struct ahash_request *req)
351{
352 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
353}
354EXPORT_SYMBOL_GPL(crypto_ahash_finup);
355
356int crypto_ahash_digest(struct ahash_request *req)
357{
358 return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->digest);
359}
360EXPORT_SYMBOL_GPL(crypto_ahash_digest);
361
362static void ahash_def_finup_finish2(struct ahash_request *req, int err)
363{
364 struct ahash_request_priv *priv = req->priv;
365
366 if (err == -EINPROGRESS)
367 return;
368
369 if (!err)
370 memcpy(priv->result, req->result,
371 crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
372
373 ahash_restore_req(req);
374}
375
376static void ahash_def_finup_done2(struct crypto_async_request *req, int err)
377{
378 struct ahash_request *areq = req->data;
379
380 ahash_def_finup_finish2(areq, err);
381
382 areq->base.complete(&areq->base, err);
383}
384
385static int ahash_def_finup_finish1(struct ahash_request *req, int err)
386{
387 if (err)
388 goto out;
389
390 req->base.complete = ahash_def_finup_done2;
391 req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
392 err = crypto_ahash_reqtfm(req)->final(req);
393
394out:
395 ahash_def_finup_finish2(req, err);
396 return err;
397}
398
399static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
400{
401 struct ahash_request *areq = req->data;
402
403 err = ahash_def_finup_finish1(areq, err);
404
405 areq->base.complete(&areq->base, err);
406}
407
408static int ahash_def_finup(struct ahash_request *req)
409{
410 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
411 int err;
412
413 err = ahash_save_req(req, ahash_def_finup_done1);
414 if (err)
415 return err;
416
417 err = tfm->update(req);
418 return ahash_def_finup_finish1(req, err);
419}
420
421static int ahash_no_export(struct ahash_request *req, void *out)
422{
423 return -ENOSYS;
424}
425
426static int ahash_no_import(struct ahash_request *req, const void *in)
427{
428 return -ENOSYS;
429}
430
431static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
432{
433 struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
434 struct ahash_alg *alg = crypto_ahash_alg(hash);
435
436 hash->setkey = ahash_nosetkey;
437 hash->has_setkey = false;
438 hash->export = ahash_no_export;
439 hash->import = ahash_no_import;
440
441 if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
442 return crypto_init_shash_ops_async(tfm);
443
444 hash->init = alg->init;
445 hash->update = alg->update;
446 hash->final = alg->final;
447 hash->finup = alg->finup ?: ahash_def_finup;
448 hash->digest = alg->digest;
449
450 if (alg->setkey) {
451 hash->setkey = alg->setkey;
452 hash->has_setkey = true;
453 }
454 if (alg->export)
455 hash->export = alg->export;
456 if (alg->import)
457 hash->import = alg->import;
458
459 return 0;
460}
461
462static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
463{
464 if (alg->cra_type == &crypto_ahash_type)
465 return alg->cra_ctxsize;
466
467 return sizeof(struct crypto_shash *);
468}
469
470#ifdef CONFIG_NET
471static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
472{
473 struct crypto_report_hash rhash;
474
475 strncpy(rhash.type, "ahash", sizeof(rhash.type));
476
477 rhash.blocksize = alg->cra_blocksize;
478 rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
479
480 if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
481 sizeof(struct crypto_report_hash), &rhash))
482 goto nla_put_failure;
483 return 0;
484
485nla_put_failure:
486 return -EMSGSIZE;
487}
488#else
489static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
490{
491 return -ENOSYS;
492}
493#endif
494
495static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
496 __attribute__ ((unused));
497static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
498{
499 seq_printf(m, "type : ahash\n");
500 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
501 "yes" : "no");
502 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
503 seq_printf(m, "digestsize : %u\n",
504 __crypto_hash_alg_common(alg)->digestsize);
505}
506
507const struct crypto_type crypto_ahash_type = {
508 .extsize = crypto_ahash_extsize,
509 .init_tfm = crypto_ahash_init_tfm,
510#ifdef CONFIG_PROC_FS
511 .show = crypto_ahash_show,
512#endif
513 .report = crypto_ahash_report,
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};
519EXPORT_SYMBOL_GPL(crypto_ahash_type);
520
521struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
522 u32 mask)
523{
524 return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
525}
526EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
527
528int crypto_has_ahash(const char *alg_name, u32 type, u32 mask)
529{
530 return crypto_type_has_alg(alg_name, &crypto_ahash_type, type, mask);
531}
532EXPORT_SYMBOL_GPL(crypto_has_ahash);
533
534static int ahash_prepare_alg(struct ahash_alg *alg)
535{
536 struct crypto_alg *base = &alg->halg.base;
537
538 if (alg->halg.digestsize > PAGE_SIZE / 8 ||
539 alg->halg.statesize > PAGE_SIZE / 8 ||
540 alg->halg.statesize == 0)
541 return -EINVAL;
542
543 base->cra_type = &crypto_ahash_type;
544 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
545 base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
546
547 return 0;
548}
549
550int crypto_register_ahash(struct ahash_alg *alg)
551{
552 struct crypto_alg *base = &alg->halg.base;
553 int err;
554
555 err = ahash_prepare_alg(alg);
556 if (err)
557 return err;
558
559 return crypto_register_alg(base);
560}
561EXPORT_SYMBOL_GPL(crypto_register_ahash);
562
563int crypto_unregister_ahash(struct ahash_alg *alg)
564{
565 return crypto_unregister_alg(&alg->halg.base);
566}
567EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
568
569int ahash_register_instance(struct crypto_template *tmpl,
570 struct ahash_instance *inst)
571{
572 int err;
573
574 err = ahash_prepare_alg(&inst->alg);
575 if (err)
576 return err;
577
578 return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
579}
580EXPORT_SYMBOL_GPL(ahash_register_instance);
581
582void ahash_free_instance(struct crypto_instance *inst)
583{
584 crypto_drop_spawn(crypto_instance_ctx(inst));
585 kfree(ahash_instance(inst));
586}
587EXPORT_SYMBOL_GPL(ahash_free_instance);
588
589int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn,
590 struct hash_alg_common *alg,
591 struct crypto_instance *inst)
592{
593 return crypto_init_spawn2(&spawn->base, &alg->base, inst,
594 &crypto_ahash_type);
595}
596EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn);
597
598struct hash_alg_common *ahash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
599{
600 struct crypto_alg *alg;
601
602 alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask);
603 return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg);
604}
605EXPORT_SYMBOL_GPL(ahash_attr_alg);
606
607MODULE_LICENSE("GPL");
608MODULE_DESCRIPTION("Asynchronous cryptographic hash type");