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