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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/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/cryptouser.h>
20#include <linux/compiler.h>
21#include <net/netlink.h>
22
23#include "internal.h"
24
25static const struct crypto_type crypto_ahash_type;
26
27struct ahash_request_priv {
28 crypto_completion_t complete;
29 void *data;
30 u8 *result;
31 u32 flags;
32 void *ubuf[] CRYPTO_MINALIGN_ATTR;
33};
34
35static inline struct ahash_alg *crypto_ahash_alg(struct crypto_ahash *hash)
36{
37 return container_of(crypto_hash_alg_common(hash), struct ahash_alg,
38 halg);
39}
40
41static int hash_walk_next(struct crypto_hash_walk *walk)
42{
43 unsigned int alignmask = walk->alignmask;
44 unsigned int offset = walk->offset;
45 unsigned int nbytes = min(walk->entrylen,
46 ((unsigned int)(PAGE_SIZE)) - offset);
47
48 walk->data = kmap_atomic(walk->pg);
49 walk->data += offset;
50
51 if (offset & alignmask) {
52 unsigned int unaligned = alignmask + 1 - (offset & alignmask);
53
54 if (nbytes > unaligned)
55 nbytes = unaligned;
56 }
57
58 walk->entrylen -= nbytes;
59 return nbytes;
60}
61
62static int hash_walk_new_entry(struct crypto_hash_walk *walk)
63{
64 struct scatterlist *sg;
65
66 sg = walk->sg;
67 walk->offset = sg->offset;
68 walk->pg = sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
69 walk->offset = offset_in_page(walk->offset);
70 walk->entrylen = sg->length;
71
72 if (walk->entrylen > walk->total)
73 walk->entrylen = walk->total;
74 walk->total -= walk->entrylen;
75
76 return hash_walk_next(walk);
77}
78
79int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
80{
81 unsigned int alignmask = walk->alignmask;
82
83 walk->data -= walk->offset;
84
85 if (walk->entrylen && (walk->offset & alignmask) && !err) {
86 unsigned int nbytes;
87
88 walk->offset = ALIGN(walk->offset, alignmask + 1);
89 nbytes = min(walk->entrylen,
90 (unsigned int)(PAGE_SIZE - walk->offset));
91 if (nbytes) {
92 walk->entrylen -= nbytes;
93 walk->data += walk->offset;
94 return nbytes;
95 }
96 }
97
98 kunmap_atomic(walk->data);
99 crypto_yield(walk->flags);
100
101 if (err)
102 return err;
103
104 if (walk->entrylen) {
105 walk->offset = 0;
106 walk->pg++;
107 return hash_walk_next(walk);
108 }
109
110 if (!walk->total)
111 return 0;
112
113 walk->sg = sg_next(walk->sg);
114
115 return hash_walk_new_entry(walk);
116}
117EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
118
119int crypto_hash_walk_first(struct ahash_request *req,
120 struct crypto_hash_walk *walk)
121{
122 walk->total = req->nbytes;
123
124 if (!walk->total) {
125 walk->entrylen = 0;
126 return 0;
127 }
128
129 walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
130 walk->sg = req->src;
131 walk->flags = req->base.flags;
132
133 return hash_walk_new_entry(walk);
134}
135EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
136
137static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
138 unsigned int keylen)
139{
140 unsigned long alignmask = crypto_ahash_alignmask(tfm);
141 int ret;
142 u8 *buffer, *alignbuffer;
143 unsigned long absize;
144
145 absize = keylen + alignmask;
146 buffer = kmalloc(absize, GFP_KERNEL);
147 if (!buffer)
148 return -ENOMEM;
149
150 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
151 memcpy(alignbuffer, key, keylen);
152 ret = tfm->setkey(tfm, alignbuffer, keylen);
153 kfree_sensitive(buffer);
154 return ret;
155}
156
157static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
158 unsigned int keylen)
159{
160 return -ENOSYS;
161}
162
163static void ahash_set_needkey(struct crypto_ahash *tfm)
164{
165 const struct hash_alg_common *alg = crypto_hash_alg_common(tfm);
166
167 if (tfm->setkey != ahash_nosetkey &&
168 !(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
169 crypto_ahash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
170}
171
172int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
173 unsigned int keylen)
174{
175 unsigned long alignmask = crypto_ahash_alignmask(tfm);
176 int err;
177
178 if ((unsigned long)key & alignmask)
179 err = ahash_setkey_unaligned(tfm, key, keylen);
180 else
181 err = tfm->setkey(tfm, key, keylen);
182
183 if (unlikely(err)) {
184 ahash_set_needkey(tfm);
185 return err;
186 }
187
188 crypto_ahash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
189 return 0;
190}
191EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
192
193static inline unsigned int ahash_align_buffer_size(unsigned len,
194 unsigned long mask)
195{
196 return len + (mask & ~(crypto_tfm_ctx_alignment() - 1));
197}
198
199static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt)
200{
201 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
202 unsigned long alignmask = crypto_ahash_alignmask(tfm);
203 unsigned int ds = crypto_ahash_digestsize(tfm);
204 struct ahash_request_priv *priv;
205
206 priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
207 (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
208 GFP_KERNEL : GFP_ATOMIC);
209 if (!priv)
210 return -ENOMEM;
211
212 /*
213 * WARNING: Voodoo programming below!
214 *
215 * The code below is obscure and hard to understand, thus explanation
216 * is necessary. See include/crypto/hash.h and include/linux/crypto.h
217 * to understand the layout of structures used here!
218 *
219 * The code here will replace portions of the ORIGINAL request with
220 * pointers to new code and buffers so the hashing operation can store
221 * the result in aligned buffer. We will call the modified request
222 * an ADJUSTED request.
223 *
224 * The newly mangled request will look as such:
225 *
226 * req {
227 * .result = ADJUSTED[new aligned buffer]
228 * .base.complete = ADJUSTED[pointer to completion function]
229 * .base.data = ADJUSTED[*req (pointer to self)]
230 * .priv = ADJUSTED[new priv] {
231 * .result = ORIGINAL(result)
232 * .complete = ORIGINAL(base.complete)
233 * .data = ORIGINAL(base.data)
234 * }
235 */
236
237 priv->result = req->result;
238 priv->complete = req->base.complete;
239 priv->data = req->base.data;
240 priv->flags = req->base.flags;
241
242 /*
243 * WARNING: We do not backup req->priv here! The req->priv
244 * is for internal use of the Crypto API and the
245 * user must _NOT_ _EVER_ depend on it's content!
246 */
247
248 req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
249 req->base.complete = cplt;
250 req->base.data = req;
251 req->priv = priv;
252
253 return 0;
254}
255
256static void ahash_restore_req(struct ahash_request *req, int err)
257{
258 struct ahash_request_priv *priv = req->priv;
259
260 if (!err)
261 memcpy(priv->result, req->result,
262 crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
263
264 /* Restore the original crypto request. */
265 req->result = priv->result;
266
267 ahash_request_set_callback(req, priv->flags,
268 priv->complete, priv->data);
269 req->priv = NULL;
270
271 /* Free the req->priv.priv from the ADJUSTED request. */
272 kfree_sensitive(priv);
273}
274
275static void ahash_notify_einprogress(struct ahash_request *req)
276{
277 struct ahash_request_priv *priv = req->priv;
278 struct crypto_async_request oreq;
279
280 oreq.data = priv->data;
281
282 priv->complete(&oreq, -EINPROGRESS);
283}
284
285static void ahash_op_unaligned_done(struct crypto_async_request *req, int err)
286{
287 struct ahash_request *areq = req->data;
288
289 if (err == -EINPROGRESS) {
290 ahash_notify_einprogress(areq);
291 return;
292 }
293
294 /*
295 * Restore the original request, see ahash_op_unaligned() for what
296 * goes where.
297 *
298 * The "struct ahash_request *req" here is in fact the "req.base"
299 * from the ADJUSTED request from ahash_op_unaligned(), thus as it
300 * is a pointer to self, it is also the ADJUSTED "req" .
301 */
302
303 /* First copy req->result into req->priv.result */
304 ahash_restore_req(areq, err);
305
306 /* Complete the ORIGINAL request. */
307 areq->base.complete(&areq->base, err);
308}
309
310static int ahash_op_unaligned(struct ahash_request *req,
311 int (*op)(struct ahash_request *))
312{
313 int err;
314
315 err = ahash_save_req(req, ahash_op_unaligned_done);
316 if (err)
317 return err;
318
319 err = op(req);
320 if (err == -EINPROGRESS || err == -EBUSY)
321 return err;
322
323 ahash_restore_req(req, err);
324
325 return err;
326}
327
328static int crypto_ahash_op(struct ahash_request *req,
329 int (*op)(struct ahash_request *))
330{
331 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
332 unsigned long alignmask = crypto_ahash_alignmask(tfm);
333
334 if ((unsigned long)req->result & alignmask)
335 return ahash_op_unaligned(req, op);
336
337 return op(req);
338}
339
340int crypto_ahash_final(struct ahash_request *req)
341{
342 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
343 struct crypto_alg *alg = tfm->base.__crt_alg;
344 unsigned int nbytes = req->nbytes;
345 int ret;
346
347 crypto_stats_get(alg);
348 ret = crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
349 crypto_stats_ahash_final(nbytes, ret, alg);
350 return ret;
351}
352EXPORT_SYMBOL_GPL(crypto_ahash_final);
353
354int crypto_ahash_finup(struct ahash_request *req)
355{
356 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
357 struct crypto_alg *alg = tfm->base.__crt_alg;
358 unsigned int nbytes = req->nbytes;
359 int ret;
360
361 crypto_stats_get(alg);
362 ret = crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
363 crypto_stats_ahash_final(nbytes, ret, alg);
364 return ret;
365}
366EXPORT_SYMBOL_GPL(crypto_ahash_finup);
367
368int crypto_ahash_digest(struct ahash_request *req)
369{
370 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
371 struct crypto_alg *alg = tfm->base.__crt_alg;
372 unsigned int nbytes = req->nbytes;
373 int ret;
374
375 crypto_stats_get(alg);
376 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
377 ret = -ENOKEY;
378 else
379 ret = crypto_ahash_op(req, tfm->digest);
380 crypto_stats_ahash_final(nbytes, ret, alg);
381 return ret;
382}
383EXPORT_SYMBOL_GPL(crypto_ahash_digest);
384
385static void ahash_def_finup_done2(struct crypto_async_request *req, int err)
386{
387 struct ahash_request *areq = req->data;
388
389 if (err == -EINPROGRESS)
390 return;
391
392 ahash_restore_req(areq, err);
393
394 areq->base.complete(&areq->base, err);
395}
396
397static int ahash_def_finup_finish1(struct ahash_request *req, int err)
398{
399 if (err)
400 goto out;
401
402 req->base.complete = ahash_def_finup_done2;
403
404 err = crypto_ahash_reqtfm(req)->final(req);
405 if (err == -EINPROGRESS || err == -EBUSY)
406 return err;
407
408out:
409 ahash_restore_req(req, err);
410 return err;
411}
412
413static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
414{
415 struct ahash_request *areq = req->data;
416
417 if (err == -EINPROGRESS) {
418 ahash_notify_einprogress(areq);
419 return;
420 }
421
422 areq->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
423
424 err = ahash_def_finup_finish1(areq, err);
425 if (areq->priv)
426 return;
427
428 areq->base.complete(&areq->base, err);
429}
430
431static int ahash_def_finup(struct ahash_request *req)
432{
433 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
434 int err;
435
436 err = ahash_save_req(req, ahash_def_finup_done1);
437 if (err)
438 return err;
439
440 err = tfm->update(req);
441 if (err == -EINPROGRESS || err == -EBUSY)
442 return err;
443
444 return ahash_def_finup_finish1(req, err);
445}
446
447static void crypto_ahash_exit_tfm(struct crypto_tfm *tfm)
448{
449 struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
450 struct ahash_alg *alg = crypto_ahash_alg(hash);
451
452 alg->exit_tfm(hash);
453}
454
455static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
456{
457 struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
458 struct ahash_alg *alg = crypto_ahash_alg(hash);
459
460 hash->setkey = ahash_nosetkey;
461
462 if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
463 return crypto_init_shash_ops_async(tfm);
464
465 hash->init = alg->init;
466 hash->update = alg->update;
467 hash->final = alg->final;
468 hash->finup = alg->finup ?: ahash_def_finup;
469 hash->digest = alg->digest;
470 hash->export = alg->export;
471 hash->import = alg->import;
472
473 if (alg->setkey) {
474 hash->setkey = alg->setkey;
475 ahash_set_needkey(hash);
476 }
477
478 if (alg->exit_tfm)
479 tfm->exit = crypto_ahash_exit_tfm;
480
481 return alg->init_tfm ? alg->init_tfm(hash) : 0;
482}
483
484static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
485{
486 if (alg->cra_type != &crypto_ahash_type)
487 return sizeof(struct crypto_shash *);
488
489 return crypto_alg_extsize(alg);
490}
491
492static void crypto_ahash_free_instance(struct crypto_instance *inst)
493{
494 struct ahash_instance *ahash = ahash_instance(inst);
495
496 ahash->free(ahash);
497}
498
499#ifdef CONFIG_NET
500static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
501{
502 struct crypto_report_hash rhash;
503
504 memset(&rhash, 0, sizeof(rhash));
505
506 strscpy(rhash.type, "ahash", sizeof(rhash.type));
507
508 rhash.blocksize = alg->cra_blocksize;
509 rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
510
511 return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
512}
513#else
514static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
515{
516 return -ENOSYS;
517}
518#endif
519
520static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
521 __maybe_unused;
522static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
523{
524 seq_printf(m, "type : ahash\n");
525 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
526 "yes" : "no");
527 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
528 seq_printf(m, "digestsize : %u\n",
529 __crypto_hash_alg_common(alg)->digestsize);
530}
531
532static const struct crypto_type crypto_ahash_type = {
533 .extsize = crypto_ahash_extsize,
534 .init_tfm = crypto_ahash_init_tfm,
535 .free = crypto_ahash_free_instance,
536#ifdef CONFIG_PROC_FS
537 .show = crypto_ahash_show,
538#endif
539 .report = crypto_ahash_report,
540 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
541 .maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
542 .type = CRYPTO_ALG_TYPE_AHASH,
543 .tfmsize = offsetof(struct crypto_ahash, base),
544};
545
546int crypto_grab_ahash(struct crypto_ahash_spawn *spawn,
547 struct crypto_instance *inst,
548 const char *name, u32 type, u32 mask)
549{
550 spawn->base.frontend = &crypto_ahash_type;
551 return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
552}
553EXPORT_SYMBOL_GPL(crypto_grab_ahash);
554
555struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
556 u32 mask)
557{
558 return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
559}
560EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
561
562int crypto_has_ahash(const char *alg_name, u32 type, u32 mask)
563{
564 return crypto_type_has_alg(alg_name, &crypto_ahash_type, type, mask);
565}
566EXPORT_SYMBOL_GPL(crypto_has_ahash);
567
568static int ahash_prepare_alg(struct ahash_alg *alg)
569{
570 struct crypto_alg *base = &alg->halg.base;
571
572 if (alg->halg.digestsize > HASH_MAX_DIGESTSIZE ||
573 alg->halg.statesize > HASH_MAX_STATESIZE ||
574 alg->halg.statesize == 0)
575 return -EINVAL;
576
577 base->cra_type = &crypto_ahash_type;
578 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
579 base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
580
581 return 0;
582}
583
584int crypto_register_ahash(struct ahash_alg *alg)
585{
586 struct crypto_alg *base = &alg->halg.base;
587 int err;
588
589 err = ahash_prepare_alg(alg);
590 if (err)
591 return err;
592
593 return crypto_register_alg(base);
594}
595EXPORT_SYMBOL_GPL(crypto_register_ahash);
596
597void crypto_unregister_ahash(struct ahash_alg *alg)
598{
599 crypto_unregister_alg(&alg->halg.base);
600}
601EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
602
603int crypto_register_ahashes(struct ahash_alg *algs, int count)
604{
605 int i, ret;
606
607 for (i = 0; i < count; i++) {
608 ret = crypto_register_ahash(&algs[i]);
609 if (ret)
610 goto err;
611 }
612
613 return 0;
614
615err:
616 for (--i; i >= 0; --i)
617 crypto_unregister_ahash(&algs[i]);
618
619 return ret;
620}
621EXPORT_SYMBOL_GPL(crypto_register_ahashes);
622
623void crypto_unregister_ahashes(struct ahash_alg *algs, int count)
624{
625 int i;
626
627 for (i = count - 1; i >= 0; --i)
628 crypto_unregister_ahash(&algs[i]);
629}
630EXPORT_SYMBOL_GPL(crypto_unregister_ahashes);
631
632int ahash_register_instance(struct crypto_template *tmpl,
633 struct ahash_instance *inst)
634{
635 int err;
636
637 if (WARN_ON(!inst->free))
638 return -EINVAL;
639
640 err = ahash_prepare_alg(&inst->alg);
641 if (err)
642 return err;
643
644 return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
645}
646EXPORT_SYMBOL_GPL(ahash_register_instance);
647
648bool crypto_hash_alg_has_setkey(struct hash_alg_common *halg)
649{
650 struct crypto_alg *alg = &halg->base;
651
652 if (alg->cra_type != &crypto_ahash_type)
653 return crypto_shash_alg_has_setkey(__crypto_shash_alg(alg));
654
655 return __crypto_ahash_alg(alg)->setkey != NULL;
656}
657EXPORT_SYMBOL_GPL(crypto_hash_alg_has_setkey);
658
659MODULE_LICENSE("GPL");
660MODULE_DESCRIPTION("Asynchronous cryptographic hash type");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Asynchronous Cryptographic Hash operations.
4 *
5 * This is the 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
26static const struct crypto_type crypto_ahash_type;
27
28struct ahash_request_priv {
29 crypto_completion_t complete;
30 void *data;
31 u8 *result;
32 u32 flags;
33 void *ubuf[] CRYPTO_MINALIGN_ATTR;
34};
35
36static inline struct ahash_alg *crypto_ahash_alg(struct crypto_ahash *hash)
37{
38 return container_of(crypto_hash_alg_common(hash), struct ahash_alg,
39 halg);
40}
41
42static int hash_walk_next(struct crypto_hash_walk *walk)
43{
44 unsigned int alignmask = walk->alignmask;
45 unsigned int offset = walk->offset;
46 unsigned int nbytes = min(walk->entrylen,
47 ((unsigned int)(PAGE_SIZE)) - offset);
48
49 if (walk->flags & CRYPTO_ALG_ASYNC)
50 walk->data = kmap(walk->pg);
51 else
52 walk->data = kmap_atomic(walk->pg);
53 walk->data += offset;
54
55 if (offset & alignmask) {
56 unsigned int unaligned = alignmask + 1 - (offset & alignmask);
57
58 if (nbytes > unaligned)
59 nbytes = unaligned;
60 }
61
62 walk->entrylen -= nbytes;
63 return nbytes;
64}
65
66static int hash_walk_new_entry(struct crypto_hash_walk *walk)
67{
68 struct scatterlist *sg;
69
70 sg = walk->sg;
71 walk->offset = sg->offset;
72 walk->pg = sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
73 walk->offset = offset_in_page(walk->offset);
74 walk->entrylen = sg->length;
75
76 if (walk->entrylen > walk->total)
77 walk->entrylen = walk->total;
78 walk->total -= walk->entrylen;
79
80 return hash_walk_next(walk);
81}
82
83int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
84{
85 unsigned int alignmask = walk->alignmask;
86
87 walk->data -= walk->offset;
88
89 if (walk->entrylen && (walk->offset & alignmask) && !err) {
90 unsigned int nbytes;
91
92 walk->offset = ALIGN(walk->offset, alignmask + 1);
93 nbytes = min(walk->entrylen,
94 (unsigned int)(PAGE_SIZE - walk->offset));
95 if (nbytes) {
96 walk->entrylen -= nbytes;
97 walk->data += walk->offset;
98 return nbytes;
99 }
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 (walk->entrylen) {
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 kfree_sensitive(buffer);
187 return ret;
188}
189
190static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key,
191 unsigned int keylen)
192{
193 return -ENOSYS;
194}
195
196static void ahash_set_needkey(struct crypto_ahash *tfm)
197{
198 const struct hash_alg_common *alg = crypto_hash_alg_common(tfm);
199
200 if (tfm->setkey != ahash_nosetkey &&
201 !(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
202 crypto_ahash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
203}
204
205int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
206 unsigned int keylen)
207{
208 unsigned long alignmask = crypto_ahash_alignmask(tfm);
209 int err;
210
211 if ((unsigned long)key & alignmask)
212 err = ahash_setkey_unaligned(tfm, key, keylen);
213 else
214 err = tfm->setkey(tfm, key, keylen);
215
216 if (unlikely(err)) {
217 ahash_set_needkey(tfm);
218 return err;
219 }
220
221 crypto_ahash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
222 return 0;
223}
224EXPORT_SYMBOL_GPL(crypto_ahash_setkey);
225
226static inline unsigned int ahash_align_buffer_size(unsigned len,
227 unsigned long mask)
228{
229 return len + (mask & ~(crypto_tfm_ctx_alignment() - 1));
230}
231
232static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt)
233{
234 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
235 unsigned long alignmask = crypto_ahash_alignmask(tfm);
236 unsigned int ds = crypto_ahash_digestsize(tfm);
237 struct ahash_request_priv *priv;
238
239 priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask),
240 (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
241 GFP_KERNEL : GFP_ATOMIC);
242 if (!priv)
243 return -ENOMEM;
244
245 /*
246 * WARNING: Voodoo programming below!
247 *
248 * The code below is obscure and hard to understand, thus explanation
249 * is necessary. See include/crypto/hash.h and include/linux/crypto.h
250 * to understand the layout of structures used here!
251 *
252 * The code here will replace portions of the ORIGINAL request with
253 * pointers to new code and buffers so the hashing operation can store
254 * the result in aligned buffer. We will call the modified request
255 * an ADJUSTED request.
256 *
257 * The newly mangled request will look as such:
258 *
259 * req {
260 * .result = ADJUSTED[new aligned buffer]
261 * .base.complete = ADJUSTED[pointer to completion function]
262 * .base.data = ADJUSTED[*req (pointer to self)]
263 * .priv = ADJUSTED[new priv] {
264 * .result = ORIGINAL(result)
265 * .complete = ORIGINAL(base.complete)
266 * .data = ORIGINAL(base.data)
267 * }
268 */
269
270 priv->result = req->result;
271 priv->complete = req->base.complete;
272 priv->data = req->base.data;
273 priv->flags = req->base.flags;
274
275 /*
276 * WARNING: We do not backup req->priv here! The req->priv
277 * is for internal use of the Crypto API and the
278 * user must _NOT_ _EVER_ depend on it's content!
279 */
280
281 req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1);
282 req->base.complete = cplt;
283 req->base.data = req;
284 req->priv = priv;
285
286 return 0;
287}
288
289static void ahash_restore_req(struct ahash_request *req, int err)
290{
291 struct ahash_request_priv *priv = req->priv;
292
293 if (!err)
294 memcpy(priv->result, req->result,
295 crypto_ahash_digestsize(crypto_ahash_reqtfm(req)));
296
297 /* Restore the original crypto request. */
298 req->result = priv->result;
299
300 ahash_request_set_callback(req, priv->flags,
301 priv->complete, priv->data);
302 req->priv = NULL;
303
304 /* Free the req->priv.priv from the ADJUSTED request. */
305 kfree_sensitive(priv);
306}
307
308static void ahash_notify_einprogress(struct ahash_request *req)
309{
310 struct ahash_request_priv *priv = req->priv;
311 struct crypto_async_request oreq;
312
313 oreq.data = priv->data;
314
315 priv->complete(&oreq, -EINPROGRESS);
316}
317
318static void ahash_op_unaligned_done(struct crypto_async_request *req, int err)
319{
320 struct ahash_request *areq = req->data;
321
322 if (err == -EINPROGRESS) {
323 ahash_notify_einprogress(areq);
324 return;
325 }
326
327 /*
328 * Restore the original request, see ahash_op_unaligned() for what
329 * goes where.
330 *
331 * The "struct ahash_request *req" here is in fact the "req.base"
332 * from the ADJUSTED request from ahash_op_unaligned(), thus as it
333 * is a pointer to self, it is also the ADJUSTED "req" .
334 */
335
336 /* First copy req->result into req->priv.result */
337 ahash_restore_req(areq, err);
338
339 /* Complete the ORIGINAL request. */
340 areq->base.complete(&areq->base, err);
341}
342
343static int ahash_op_unaligned(struct ahash_request *req,
344 int (*op)(struct ahash_request *))
345{
346 int err;
347
348 err = ahash_save_req(req, ahash_op_unaligned_done);
349 if (err)
350 return err;
351
352 err = op(req);
353 if (err == -EINPROGRESS || err == -EBUSY)
354 return err;
355
356 ahash_restore_req(req, err);
357
358 return err;
359}
360
361static int crypto_ahash_op(struct ahash_request *req,
362 int (*op)(struct ahash_request *))
363{
364 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
365 unsigned long alignmask = crypto_ahash_alignmask(tfm);
366
367 if ((unsigned long)req->result & alignmask)
368 return ahash_op_unaligned(req, op);
369
370 return op(req);
371}
372
373int crypto_ahash_final(struct ahash_request *req)
374{
375 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
376 struct crypto_alg *alg = tfm->base.__crt_alg;
377 unsigned int nbytes = req->nbytes;
378 int ret;
379
380 crypto_stats_get(alg);
381 ret = crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final);
382 crypto_stats_ahash_final(nbytes, ret, alg);
383 return ret;
384}
385EXPORT_SYMBOL_GPL(crypto_ahash_final);
386
387int crypto_ahash_finup(struct ahash_request *req)
388{
389 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
390 struct crypto_alg *alg = tfm->base.__crt_alg;
391 unsigned int nbytes = req->nbytes;
392 int ret;
393
394 crypto_stats_get(alg);
395 ret = crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup);
396 crypto_stats_ahash_final(nbytes, ret, alg);
397 return ret;
398}
399EXPORT_SYMBOL_GPL(crypto_ahash_finup);
400
401int crypto_ahash_digest(struct ahash_request *req)
402{
403 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
404 struct crypto_alg *alg = tfm->base.__crt_alg;
405 unsigned int nbytes = req->nbytes;
406 int ret;
407
408 crypto_stats_get(alg);
409 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
410 ret = -ENOKEY;
411 else
412 ret = crypto_ahash_op(req, tfm->digest);
413 crypto_stats_ahash_final(nbytes, ret, alg);
414 return ret;
415}
416EXPORT_SYMBOL_GPL(crypto_ahash_digest);
417
418static void ahash_def_finup_done2(struct crypto_async_request *req, int err)
419{
420 struct ahash_request *areq = req->data;
421
422 if (err == -EINPROGRESS)
423 return;
424
425 ahash_restore_req(areq, err);
426
427 areq->base.complete(&areq->base, err);
428}
429
430static int ahash_def_finup_finish1(struct ahash_request *req, int err)
431{
432 if (err)
433 goto out;
434
435 req->base.complete = ahash_def_finup_done2;
436
437 err = crypto_ahash_reqtfm(req)->final(req);
438 if (err == -EINPROGRESS || err == -EBUSY)
439 return err;
440
441out:
442 ahash_restore_req(req, err);
443 return err;
444}
445
446static void ahash_def_finup_done1(struct crypto_async_request *req, int err)
447{
448 struct ahash_request *areq = req->data;
449
450 if (err == -EINPROGRESS) {
451 ahash_notify_einprogress(areq);
452 return;
453 }
454
455 areq->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
456
457 err = ahash_def_finup_finish1(areq, err);
458 if (areq->priv)
459 return;
460
461 areq->base.complete(&areq->base, err);
462}
463
464static int ahash_def_finup(struct ahash_request *req)
465{
466 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
467 int err;
468
469 err = ahash_save_req(req, ahash_def_finup_done1);
470 if (err)
471 return err;
472
473 err = tfm->update(req);
474 if (err == -EINPROGRESS || err == -EBUSY)
475 return err;
476
477 return ahash_def_finup_finish1(req, err);
478}
479
480static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
481{
482 struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
483 struct ahash_alg *alg = crypto_ahash_alg(hash);
484
485 hash->setkey = ahash_nosetkey;
486
487 if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
488 return crypto_init_shash_ops_async(tfm);
489
490 hash->init = alg->init;
491 hash->update = alg->update;
492 hash->final = alg->final;
493 hash->finup = alg->finup ?: ahash_def_finup;
494 hash->digest = alg->digest;
495 hash->export = alg->export;
496 hash->import = alg->import;
497
498 if (alg->setkey) {
499 hash->setkey = alg->setkey;
500 ahash_set_needkey(hash);
501 }
502
503 return 0;
504}
505
506static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)
507{
508 if (alg->cra_type != &crypto_ahash_type)
509 return sizeof(struct crypto_shash *);
510
511 return crypto_alg_extsize(alg);
512}
513
514static void crypto_ahash_free_instance(struct crypto_instance *inst)
515{
516 struct ahash_instance *ahash = ahash_instance(inst);
517
518 ahash->free(ahash);
519}
520
521#ifdef CONFIG_NET
522static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
523{
524 struct crypto_report_hash rhash;
525
526 memset(&rhash, 0, sizeof(rhash));
527
528 strscpy(rhash.type, "ahash", sizeof(rhash.type));
529
530 rhash.blocksize = alg->cra_blocksize;
531 rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize;
532
533 return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash);
534}
535#else
536static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg)
537{
538 return -ENOSYS;
539}
540#endif
541
542static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
543 __maybe_unused;
544static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
545{
546 seq_printf(m, "type : ahash\n");
547 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
548 "yes" : "no");
549 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
550 seq_printf(m, "digestsize : %u\n",
551 __crypto_hash_alg_common(alg)->digestsize);
552}
553
554static const struct crypto_type crypto_ahash_type = {
555 .extsize = crypto_ahash_extsize,
556 .init_tfm = crypto_ahash_init_tfm,
557 .free = crypto_ahash_free_instance,
558#ifdef CONFIG_PROC_FS
559 .show = crypto_ahash_show,
560#endif
561 .report = crypto_ahash_report,
562 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
563 .maskset = CRYPTO_ALG_TYPE_AHASH_MASK,
564 .type = CRYPTO_ALG_TYPE_AHASH,
565 .tfmsize = offsetof(struct crypto_ahash, base),
566};
567
568int crypto_grab_ahash(struct crypto_ahash_spawn *spawn,
569 struct crypto_instance *inst,
570 const char *name, u32 type, u32 mask)
571{
572 spawn->base.frontend = &crypto_ahash_type;
573 return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
574}
575EXPORT_SYMBOL_GPL(crypto_grab_ahash);
576
577struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
578 u32 mask)
579{
580 return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask);
581}
582EXPORT_SYMBOL_GPL(crypto_alloc_ahash);
583
584int crypto_has_ahash(const char *alg_name, u32 type, u32 mask)
585{
586 return crypto_type_has_alg(alg_name, &crypto_ahash_type, type, mask);
587}
588EXPORT_SYMBOL_GPL(crypto_has_ahash);
589
590static int ahash_prepare_alg(struct ahash_alg *alg)
591{
592 struct crypto_alg *base = &alg->halg.base;
593
594 if (alg->halg.digestsize > HASH_MAX_DIGESTSIZE ||
595 alg->halg.statesize > HASH_MAX_STATESIZE ||
596 alg->halg.statesize == 0)
597 return -EINVAL;
598
599 base->cra_type = &crypto_ahash_type;
600 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
601 base->cra_flags |= CRYPTO_ALG_TYPE_AHASH;
602
603 return 0;
604}
605
606int crypto_register_ahash(struct ahash_alg *alg)
607{
608 struct crypto_alg *base = &alg->halg.base;
609 int err;
610
611 err = ahash_prepare_alg(alg);
612 if (err)
613 return err;
614
615 return crypto_register_alg(base);
616}
617EXPORT_SYMBOL_GPL(crypto_register_ahash);
618
619void crypto_unregister_ahash(struct ahash_alg *alg)
620{
621 crypto_unregister_alg(&alg->halg.base);
622}
623EXPORT_SYMBOL_GPL(crypto_unregister_ahash);
624
625int crypto_register_ahashes(struct ahash_alg *algs, int count)
626{
627 int i, ret;
628
629 for (i = 0; i < count; i++) {
630 ret = crypto_register_ahash(&algs[i]);
631 if (ret)
632 goto err;
633 }
634
635 return 0;
636
637err:
638 for (--i; i >= 0; --i)
639 crypto_unregister_ahash(&algs[i]);
640
641 return ret;
642}
643EXPORT_SYMBOL_GPL(crypto_register_ahashes);
644
645void crypto_unregister_ahashes(struct ahash_alg *algs, int count)
646{
647 int i;
648
649 for (i = count - 1; i >= 0; --i)
650 crypto_unregister_ahash(&algs[i]);
651}
652EXPORT_SYMBOL_GPL(crypto_unregister_ahashes);
653
654int ahash_register_instance(struct crypto_template *tmpl,
655 struct ahash_instance *inst)
656{
657 int err;
658
659 if (WARN_ON(!inst->free))
660 return -EINVAL;
661
662 err = ahash_prepare_alg(&inst->alg);
663 if (err)
664 return err;
665
666 return crypto_register_instance(tmpl, ahash_crypto_instance(inst));
667}
668EXPORT_SYMBOL_GPL(ahash_register_instance);
669
670bool crypto_hash_alg_has_setkey(struct hash_alg_common *halg)
671{
672 struct crypto_alg *alg = &halg->base;
673
674 if (alg->cra_type != &crypto_ahash_type)
675 return crypto_shash_alg_has_setkey(__crypto_shash_alg(alg));
676
677 return __crypto_ahash_alg(alg)->setkey != NULL;
678}
679EXPORT_SYMBOL_GPL(crypto_hash_alg_has_setkey);
680
681MODULE_LICENSE("GPL");
682MODULE_DESCRIPTION("Asynchronous cryptographic hash type");