Commit | Line | Data |
---|---|---|
004a403c LH |
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 | ||
20036252 HX |
16 | #include <crypto/internal/hash.h> |
17 | #include <crypto/scatterwalk.h> | |
004a403c LH |
18 | #include <linux/err.h> |
19 | #include <linux/kernel.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/sched.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/seq_file.h> | |
6238cbae SK |
24 | #include <linux/cryptouser.h> |
25 | #include <net/netlink.h> | |
004a403c LH |
26 | |
27 | #include "internal.h" | |
28 | ||
66f6ce5e HX |
29 | struct ahash_request_priv { |
30 | crypto_completion_t complete; | |
31 | void *data; | |
32 | u8 *result; | |
33 | void *ubuf[] CRYPTO_MINALIGN_ATTR; | |
34 | }; | |
35 | ||
88056ec3 HX |
36 | static 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 | ||
20036252 HX |
42 | static 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 | ||
f0dfc0b0 | 49 | walk->data = kmap_atomic(walk->pg); |
20036252 HX |
50 | walk->data += offset; |
51 | ||
23a75eee SÖ |
52 | if (offset & alignmask) { |
53 | unsigned int unaligned = alignmask + 1 - (offset & alignmask); | |
54 | if (nbytes > unaligned) | |
55 | nbytes = unaligned; | |
56 | } | |
20036252 HX |
57 | |
58 | walk->entrylen -= nbytes; | |
59 | return nbytes; | |
60 | } | |
61 | ||
62 | static int hash_walk_new_entry(struct crypto_hash_walk *walk) | |
63 | { | |
64 | struct scatterlist *sg; | |
65 | ||
66 | sg = walk->sg; | |
67 | walk->pg = sg_page(sg); | |
68 | walk->offset = sg->offset; | |
69 | walk->entrylen = sg->length; | |
70 | ||
71 | if (walk->entrylen > walk->total) | |
72 | walk->entrylen = walk->total; | |
73 | walk->total -= walk->entrylen; | |
74 | ||
75 | return hash_walk_next(walk); | |
76 | } | |
77 | ||
78 | int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err) | |
79 | { | |
80 | unsigned int alignmask = walk->alignmask; | |
81 | unsigned int nbytes = walk->entrylen; | |
82 | ||
83 | walk->data -= walk->offset; | |
84 | ||
85 | if (nbytes && walk->offset & alignmask && !err) { | |
20036252 HX |
86 | walk->offset = ALIGN(walk->offset, alignmask + 1); |
87 | walk->data += walk->offset; | |
88 | ||
89 | nbytes = min(nbytes, | |
90 | ((unsigned int)(PAGE_SIZE)) - walk->offset); | |
91 | walk->entrylen -= nbytes; | |
92 | ||
93 | return nbytes; | |
94 | } | |
95 | ||
f0dfc0b0 | 96 | kunmap_atomic(walk->data); |
20036252 HX |
97 | crypto_yield(walk->flags); |
98 | ||
99 | if (err) | |
100 | return err; | |
101 | ||
d315a0e0 HX |
102 | if (nbytes) { |
103 | walk->offset = 0; | |
104 | walk->pg++; | |
20036252 | 105 | return hash_walk_next(walk); |
d315a0e0 | 106 | } |
20036252 HX |
107 | |
108 | if (!walk->total) | |
109 | return 0; | |
110 | ||
111 | walk->sg = scatterwalk_sg_next(walk->sg); | |
112 | ||
113 | return hash_walk_new_entry(walk); | |
114 | } | |
115 | EXPORT_SYMBOL_GPL(crypto_hash_walk_done); | |
116 | ||
117 | int crypto_hash_walk_first(struct ahash_request *req, | |
118 | struct crypto_hash_walk *walk) | |
119 | { | |
120 | walk->total = req->nbytes; | |
121 | ||
122 | if (!walk->total) | |
123 | return 0; | |
124 | ||
125 | walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req)); | |
126 | walk->sg = req->src; | |
127 | walk->flags = req->base.flags; | |
128 | ||
129 | return hash_walk_new_entry(walk); | |
130 | } | |
131 | EXPORT_SYMBOL_GPL(crypto_hash_walk_first); | |
132 | ||
5f7082ed HX |
133 | int crypto_hash_walk_first_compat(struct hash_desc *hdesc, |
134 | struct crypto_hash_walk *walk, | |
135 | struct scatterlist *sg, unsigned int len) | |
136 | { | |
137 | walk->total = len; | |
138 | ||
139 | if (!walk->total) | |
140 | return 0; | |
141 | ||
142 | walk->alignmask = crypto_hash_alignmask(hdesc->tfm); | |
143 | walk->sg = sg; | |
144 | walk->flags = hdesc->flags; | |
145 | ||
146 | return hash_walk_new_entry(walk); | |
147 | } | |
148 | ||
004a403c LH |
149 | static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key, |
150 | unsigned int keylen) | |
151 | { | |
004a403c LH |
152 | unsigned long alignmask = crypto_ahash_alignmask(tfm); |
153 | int ret; | |
154 | u8 *buffer, *alignbuffer; | |
155 | unsigned long absize; | |
156 | ||
157 | absize = keylen + alignmask; | |
093900c2 | 158 | buffer = kmalloc(absize, GFP_KERNEL); |
004a403c LH |
159 | if (!buffer) |
160 | return -ENOMEM; | |
161 | ||
162 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
163 | memcpy(alignbuffer, key, keylen); | |
a70c5225 | 164 | ret = tfm->setkey(tfm, alignbuffer, keylen); |
8c32c516 | 165 | kzfree(buffer); |
004a403c LH |
166 | return ret; |
167 | } | |
168 | ||
66f6ce5e | 169 | int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key, |
004a403c LH |
170 | unsigned int keylen) |
171 | { | |
004a403c LH |
172 | unsigned long alignmask = crypto_ahash_alignmask(tfm); |
173 | ||
174 | if ((unsigned long)key & alignmask) | |
175 | return ahash_setkey_unaligned(tfm, key, keylen); | |
176 | ||
a70c5225 | 177 | return tfm->setkey(tfm, key, keylen); |
004a403c | 178 | } |
66f6ce5e | 179 | EXPORT_SYMBOL_GPL(crypto_ahash_setkey); |
004a403c | 180 | |
3751f402 HX |
181 | static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key, |
182 | unsigned int keylen) | |
183 | { | |
184 | return -ENOSYS; | |
185 | } | |
186 | ||
66f6ce5e HX |
187 | static inline unsigned int ahash_align_buffer_size(unsigned len, |
188 | unsigned long mask) | |
189 | { | |
190 | return len + (mask & ~(crypto_tfm_ctx_alignment() - 1)); | |
191 | } | |
192 | ||
193 | static void ahash_op_unaligned_finish(struct ahash_request *req, int err) | |
194 | { | |
195 | struct ahash_request_priv *priv = req->priv; | |
196 | ||
197 | if (err == -EINPROGRESS) | |
198 | return; | |
199 | ||
200 | if (!err) | |
201 | memcpy(priv->result, req->result, | |
202 | crypto_ahash_digestsize(crypto_ahash_reqtfm(req))); | |
203 | ||
204 | kzfree(priv); | |
205 | } | |
206 | ||
207 | static void ahash_op_unaligned_done(struct crypto_async_request *req, int err) | |
208 | { | |
209 | struct ahash_request *areq = req->data; | |
210 | struct ahash_request_priv *priv = areq->priv; | |
211 | crypto_completion_t complete = priv->complete; | |
212 | void *data = priv->data; | |
213 | ||
214 | ahash_op_unaligned_finish(areq, err); | |
215 | ||
1d9a394b MV |
216 | areq->base.complete = complete; |
217 | areq->base.data = data; | |
218 | ||
219 | complete(&areq->base, err); | |
66f6ce5e HX |
220 | } |
221 | ||
222 | static int ahash_op_unaligned(struct ahash_request *req, | |
223 | int (*op)(struct ahash_request *)) | |
224 | { | |
225 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); | |
226 | unsigned long alignmask = crypto_ahash_alignmask(tfm); | |
227 | unsigned int ds = crypto_ahash_digestsize(tfm); | |
228 | struct ahash_request_priv *priv; | |
229 | int err; | |
230 | ||
231 | priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask), | |
232 | (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? | |
5befbd5a | 233 | GFP_KERNEL : GFP_ATOMIC); |
66f6ce5e HX |
234 | if (!priv) |
235 | return -ENOMEM; | |
236 | ||
237 | priv->result = req->result; | |
238 | priv->complete = req->base.complete; | |
239 | priv->data = req->base.data; | |
240 | ||
241 | req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1); | |
242 | req->base.complete = ahash_op_unaligned_done; | |
243 | req->base.data = req; | |
244 | req->priv = priv; | |
245 | ||
246 | err = op(req); | |
247 | ahash_op_unaligned_finish(req, err); | |
248 | ||
249 | return err; | |
250 | } | |
251 | ||
252 | static int crypto_ahash_op(struct ahash_request *req, | |
253 | int (*op)(struct ahash_request *)) | |
254 | { | |
255 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); | |
256 | unsigned long alignmask = crypto_ahash_alignmask(tfm); | |
257 | ||
258 | if ((unsigned long)req->result & alignmask) | |
259 | return ahash_op_unaligned(req, op); | |
260 | ||
261 | return op(req); | |
262 | } | |
263 | ||
264 | int crypto_ahash_final(struct ahash_request *req) | |
265 | { | |
266 | return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final); | |
267 | } | |
268 | EXPORT_SYMBOL_GPL(crypto_ahash_final); | |
269 | ||
270 | int crypto_ahash_finup(struct ahash_request *req) | |
271 | { | |
272 | return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup); | |
273 | } | |
274 | EXPORT_SYMBOL_GPL(crypto_ahash_finup); | |
275 | ||
276 | int crypto_ahash_digest(struct ahash_request *req) | |
277 | { | |
278 | return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->digest); | |
279 | } | |
280 | EXPORT_SYMBOL_GPL(crypto_ahash_digest); | |
281 | ||
282 | static void ahash_def_finup_finish2(struct ahash_request *req, int err) | |
283 | { | |
284 | struct ahash_request_priv *priv = req->priv; | |
285 | ||
286 | if (err == -EINPROGRESS) | |
287 | return; | |
288 | ||
289 | if (!err) | |
290 | memcpy(priv->result, req->result, | |
291 | crypto_ahash_digestsize(crypto_ahash_reqtfm(req))); | |
292 | ||
293 | kzfree(priv); | |
294 | } | |
295 | ||
296 | static void ahash_def_finup_done2(struct crypto_async_request *req, int err) | |
297 | { | |
298 | struct ahash_request *areq = req->data; | |
299 | struct ahash_request_priv *priv = areq->priv; | |
300 | crypto_completion_t complete = priv->complete; | |
301 | void *data = priv->data; | |
302 | ||
303 | ahash_def_finup_finish2(areq, err); | |
304 | ||
305 | complete(data, err); | |
306 | } | |
307 | ||
308 | static int ahash_def_finup_finish1(struct ahash_request *req, int err) | |
309 | { | |
310 | if (err) | |
311 | goto out; | |
312 | ||
313 | req->base.complete = ahash_def_finup_done2; | |
314 | req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; | |
315 | err = crypto_ahash_reqtfm(req)->final(req); | |
316 | ||
317 | out: | |
318 | ahash_def_finup_finish2(req, err); | |
319 | return err; | |
320 | } | |
321 | ||
322 | static void ahash_def_finup_done1(struct crypto_async_request *req, int err) | |
323 | { | |
324 | struct ahash_request *areq = req->data; | |
325 | struct ahash_request_priv *priv = areq->priv; | |
326 | crypto_completion_t complete = priv->complete; | |
327 | void *data = priv->data; | |
328 | ||
329 | err = ahash_def_finup_finish1(areq, err); | |
330 | ||
331 | complete(data, err); | |
332 | } | |
333 | ||
334 | static int ahash_def_finup(struct ahash_request *req) | |
335 | { | |
336 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); | |
337 | unsigned long alignmask = crypto_ahash_alignmask(tfm); | |
338 | unsigned int ds = crypto_ahash_digestsize(tfm); | |
339 | struct ahash_request_priv *priv; | |
340 | ||
341 | priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask), | |
342 | (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? | |
5befbd5a | 343 | GFP_KERNEL : GFP_ATOMIC); |
66f6ce5e HX |
344 | if (!priv) |
345 | return -ENOMEM; | |
346 | ||
347 | priv->result = req->result; | |
348 | priv->complete = req->base.complete; | |
349 | priv->data = req->base.data; | |
350 | ||
351 | req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1); | |
352 | req->base.complete = ahash_def_finup_done1; | |
353 | req->base.data = req; | |
354 | req->priv = priv; | |
355 | ||
356 | return ahash_def_finup_finish1(req, tfm->update(req)); | |
357 | } | |
358 | ||
359 | static int ahash_no_export(struct ahash_request *req, void *out) | |
360 | { | |
361 | return -ENOSYS; | |
362 | } | |
363 | ||
364 | static int ahash_no_import(struct ahash_request *req, const void *in) | |
365 | { | |
366 | return -ENOSYS; | |
367 | } | |
368 | ||
88056ec3 HX |
369 | static int crypto_ahash_init_tfm(struct crypto_tfm *tfm) |
370 | { | |
371 | struct crypto_ahash *hash = __crypto_ahash_cast(tfm); | |
372 | struct ahash_alg *alg = crypto_ahash_alg(hash); | |
88056ec3 | 373 | |
66f6ce5e HX |
374 | hash->setkey = ahash_nosetkey; |
375 | hash->export = ahash_no_export; | |
376 | hash->import = ahash_no_import; | |
377 | ||
88056ec3 HX |
378 | if (tfm->__crt_alg->cra_type != &crypto_ahash_type) |
379 | return crypto_init_shash_ops_async(tfm); | |
380 | ||
88056ec3 HX |
381 | hash->init = alg->init; |
382 | hash->update = alg->update; | |
66f6ce5e HX |
383 | hash->final = alg->final; |
384 | hash->finup = alg->finup ?: ahash_def_finup; | |
88056ec3 | 385 | hash->digest = alg->digest; |
66f6ce5e HX |
386 | |
387 | if (alg->setkey) | |
388 | hash->setkey = alg->setkey; | |
389 | if (alg->export) | |
390 | hash->export = alg->export; | |
391 | if (alg->import) | |
392 | hash->import = alg->import; | |
88056ec3 HX |
393 | |
394 | return 0; | |
395 | } | |
396 | ||
397 | static unsigned int crypto_ahash_extsize(struct crypto_alg *alg) | |
398 | { | |
399 | if (alg->cra_type == &crypto_ahash_type) | |
400 | return alg->cra_ctxsize; | |
401 | ||
402 | return sizeof(struct crypto_shash *); | |
403 | } | |
404 | ||
3acc8473 | 405 | #ifdef CONFIG_NET |
6238cbae SK |
406 | static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg) |
407 | { | |
408 | struct crypto_report_hash rhash; | |
409 | ||
9a5467bf | 410 | strncpy(rhash.type, "ahash", sizeof(rhash.type)); |
6238cbae SK |
411 | |
412 | rhash.blocksize = alg->cra_blocksize; | |
413 | rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize; | |
414 | ||
6662df33 DM |
415 | if (nla_put(skb, CRYPTOCFGA_REPORT_HASH, |
416 | sizeof(struct crypto_report_hash), &rhash)) | |
417 | goto nla_put_failure; | |
6238cbae SK |
418 | return 0; |
419 | ||
420 | nla_put_failure: | |
421 | return -EMSGSIZE; | |
422 | } | |
3acc8473 HX |
423 | #else |
424 | static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg) | |
425 | { | |
426 | return -ENOSYS; | |
427 | } | |
428 | #endif | |
6238cbae | 429 | |
004a403c LH |
430 | static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg) |
431 | __attribute__ ((unused)); | |
432 | static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg) | |
433 | { | |
434 | seq_printf(m, "type : ahash\n"); | |
435 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? | |
436 | "yes" : "no"); | |
437 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
88056ec3 HX |
438 | seq_printf(m, "digestsize : %u\n", |
439 | __crypto_hash_alg_common(alg)->digestsize); | |
004a403c LH |
440 | } |
441 | ||
442 | const struct crypto_type crypto_ahash_type = { | |
88056ec3 HX |
443 | .extsize = crypto_ahash_extsize, |
444 | .init_tfm = crypto_ahash_init_tfm, | |
004a403c LH |
445 | #ifdef CONFIG_PROC_FS |
446 | .show = crypto_ahash_show, | |
447 | #endif | |
6238cbae | 448 | .report = crypto_ahash_report, |
88056ec3 HX |
449 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, |
450 | .maskset = CRYPTO_ALG_TYPE_AHASH_MASK, | |
451 | .type = CRYPTO_ALG_TYPE_AHASH, | |
452 | .tfmsize = offsetof(struct crypto_ahash, base), | |
004a403c LH |
453 | }; |
454 | EXPORT_SYMBOL_GPL(crypto_ahash_type); | |
455 | ||
88056ec3 HX |
456 | struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type, |
457 | u32 mask) | |
458 | { | |
459 | return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask); | |
460 | } | |
461 | EXPORT_SYMBOL_GPL(crypto_alloc_ahash); | |
462 | ||
01c2dece HX |
463 | static int ahash_prepare_alg(struct ahash_alg *alg) |
464 | { | |
465 | struct crypto_alg *base = &alg->halg.base; | |
466 | ||
467 | if (alg->halg.digestsize > PAGE_SIZE / 8 || | |
468 | alg->halg.statesize > PAGE_SIZE / 8) | |
469 | return -EINVAL; | |
470 | ||
471 | base->cra_type = &crypto_ahash_type; | |
472 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; | |
473 | base->cra_flags |= CRYPTO_ALG_TYPE_AHASH; | |
474 | ||
475 | return 0; | |
476 | } | |
477 | ||
478 | int crypto_register_ahash(struct ahash_alg *alg) | |
479 | { | |
480 | struct crypto_alg *base = &alg->halg.base; | |
481 | int err; | |
482 | ||
483 | err = ahash_prepare_alg(alg); | |
484 | if (err) | |
485 | return err; | |
486 | ||
487 | return crypto_register_alg(base); | |
488 | } | |
489 | EXPORT_SYMBOL_GPL(crypto_register_ahash); | |
490 | ||
491 | int crypto_unregister_ahash(struct ahash_alg *alg) | |
492 | { | |
493 | return crypto_unregister_alg(&alg->halg.base); | |
494 | } | |
495 | EXPORT_SYMBOL_GPL(crypto_unregister_ahash); | |
496 | ||
497 | int ahash_register_instance(struct crypto_template *tmpl, | |
498 | struct ahash_instance *inst) | |
499 | { | |
500 | int err; | |
501 | ||
502 | err = ahash_prepare_alg(&inst->alg); | |
503 | if (err) | |
504 | return err; | |
505 | ||
506 | return crypto_register_instance(tmpl, ahash_crypto_instance(inst)); | |
507 | } | |
508 | EXPORT_SYMBOL_GPL(ahash_register_instance); | |
509 | ||
510 | void ahash_free_instance(struct crypto_instance *inst) | |
511 | { | |
512 | crypto_drop_spawn(crypto_instance_ctx(inst)); | |
513 | kfree(ahash_instance(inst)); | |
514 | } | |
515 | EXPORT_SYMBOL_GPL(ahash_free_instance); | |
516 | ||
517 | int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn, | |
518 | struct hash_alg_common *alg, | |
519 | struct crypto_instance *inst) | |
520 | { | |
521 | return crypto_init_spawn2(&spawn->base, &alg->base, inst, | |
522 | &crypto_ahash_type); | |
523 | } | |
524 | EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn); | |
525 | ||
526 | struct hash_alg_common *ahash_attr_alg(struct rtattr *rta, u32 type, u32 mask) | |
527 | { | |
528 | struct crypto_alg *alg; | |
529 | ||
530 | alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask); | |
531 | return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg); | |
532 | } | |
533 | EXPORT_SYMBOL_GPL(ahash_attr_alg); | |
534 | ||
004a403c LH |
535 | MODULE_LICENSE("GPL"); |
536 | MODULE_DESCRIPTION("Asynchronous cryptographic hash type"); |