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Commit | Line | Data |
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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> | |
75ecb231 | 18 | #include <linux/bug.h> |
004a403c LH |
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> | |
6238cbae SK |
25 | #include <linux/cryptouser.h> |
26 | #include <net/netlink.h> | |
004a403c LH |
27 | |
28 | #include "internal.h" | |
29 | ||
66f6ce5e HX |
30 | struct ahash_request_priv { |
31 | crypto_completion_t complete; | |
32 | void *data; | |
33 | u8 *result; | |
13af7022 | 34 | u32 flags; |
66f6ce5e HX |
35 | void *ubuf[] CRYPTO_MINALIGN_ATTR; |
36 | }; | |
37 | ||
88056ec3 HX |
38 | static inline struct ahash_alg *crypto_ahash_alg(struct crypto_ahash *hash) |
39 | { | |
40 | return container_of(crypto_hash_alg_common(hash), struct ahash_alg, | |
41 | halg); | |
42 | } | |
43 | ||
20036252 HX |
44 | static int hash_walk_next(struct crypto_hash_walk *walk) |
45 | { | |
46 | unsigned int alignmask = walk->alignmask; | |
47 | unsigned int offset = walk->offset; | |
48 | unsigned int nbytes = min(walk->entrylen, | |
49 | ((unsigned int)(PAGE_SIZE)) - offset); | |
50 | ||
75ecb231 HX |
51 | if (walk->flags & CRYPTO_ALG_ASYNC) |
52 | walk->data = kmap(walk->pg); | |
53 | else | |
54 | walk->data = kmap_atomic(walk->pg); | |
20036252 HX |
55 | walk->data += offset; |
56 | ||
23a75eee SÖ |
57 | if (offset & alignmask) { |
58 | unsigned int unaligned = alignmask + 1 - (offset & alignmask); | |
59 | if (nbytes > unaligned) | |
60 | nbytes = unaligned; | |
61 | } | |
20036252 HX |
62 | |
63 | walk->entrylen -= nbytes; | |
64 | return nbytes; | |
65 | } | |
66 | ||
67 | static int hash_walk_new_entry(struct crypto_hash_walk *walk) | |
68 | { | |
69 | struct scatterlist *sg; | |
70 | ||
71 | sg = walk->sg; | |
20036252 | 72 | walk->offset = sg->offset; |
b986834b HX |
73 | walk->pg = sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT); |
74 | walk->offset = offset_in_page(walk->offset); | |
20036252 HX |
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 | ||
84 | int 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) { | |
20036252 | 92 | walk->offset = ALIGN(walk->offset, alignmask + 1); |
20036252 HX |
93 | nbytes = min(nbytes, |
94 | ((unsigned int)(PAGE_SIZE)) - walk->offset); | |
95 | walk->entrylen -= nbytes; | |
96 | ||
16ba2d2e HX |
97 | if (nbytes) { |
98 | walk->data += walk->offset; | |
99 | return nbytes; | |
100 | } | |
20036252 HX |
101 | } |
102 | ||
75ecb231 HX |
103 | if (walk->flags & CRYPTO_ALG_ASYNC) |
104 | kunmap(walk->pg); | |
105 | else { | |
106 | kunmap_atomic(walk->data); | |
107 | /* | |
108 | * The may sleep test only makes sense for sync users. | |
109 | * Async users don't need to sleep here anyway. | |
110 | */ | |
111 | crypto_yield(walk->flags); | |
112 | } | |
20036252 HX |
113 | |
114 | if (err) | |
115 | return err; | |
116 | ||
d315a0e0 HX |
117 | if (nbytes) { |
118 | walk->offset = 0; | |
119 | walk->pg++; | |
20036252 | 120 | return hash_walk_next(walk); |
d315a0e0 | 121 | } |
20036252 HX |
122 | |
123 | if (!walk->total) | |
124 | return 0; | |
125 | ||
126 | walk->sg = scatterwalk_sg_next(walk->sg); | |
127 | ||
128 | return hash_walk_new_entry(walk); | |
129 | } | |
130 | EXPORT_SYMBOL_GPL(crypto_hash_walk_done); | |
131 | ||
132 | int crypto_hash_walk_first(struct ahash_request *req, | |
133 | struct crypto_hash_walk *walk) | |
134 | { | |
135 | walk->total = req->nbytes; | |
136 | ||
137 | if (!walk->total) | |
138 | return 0; | |
139 | ||
140 | walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req)); | |
141 | walk->sg = req->src; | |
75ecb231 | 142 | walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK; |
20036252 HX |
143 | |
144 | return hash_walk_new_entry(walk); | |
145 | } | |
146 | EXPORT_SYMBOL_GPL(crypto_hash_walk_first); | |
147 | ||
75ecb231 HX |
148 | int crypto_ahash_walk_first(struct ahash_request *req, |
149 | struct crypto_hash_walk *walk) | |
150 | { | |
151 | walk->total = req->nbytes; | |
152 | ||
153 | if (!walk->total) | |
154 | return 0; | |
155 | ||
156 | walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req)); | |
157 | walk->sg = req->src; | |
158 | walk->flags = req->base.flags & CRYPTO_TFM_REQ_MASK; | |
159 | walk->flags |= CRYPTO_ALG_ASYNC; | |
160 | ||
161 | BUILD_BUG_ON(CRYPTO_TFM_REQ_MASK & CRYPTO_ALG_ASYNC); | |
162 | ||
163 | return hash_walk_new_entry(walk); | |
164 | } | |
165 | EXPORT_SYMBOL_GPL(crypto_ahash_walk_first); | |
166 | ||
5f7082ed HX |
167 | int crypto_hash_walk_first_compat(struct hash_desc *hdesc, |
168 | struct crypto_hash_walk *walk, | |
169 | struct scatterlist *sg, unsigned int len) | |
170 | { | |
171 | walk->total = len; | |
172 | ||
173 | if (!walk->total) | |
174 | return 0; | |
175 | ||
176 | walk->alignmask = crypto_hash_alignmask(hdesc->tfm); | |
177 | walk->sg = sg; | |
75ecb231 | 178 | walk->flags = hdesc->flags & CRYPTO_TFM_REQ_MASK; |
5f7082ed HX |
179 | |
180 | return hash_walk_new_entry(walk); | |
181 | } | |
182 | ||
004a403c LH |
183 | static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key, |
184 | unsigned int keylen) | |
185 | { | |
004a403c LH |
186 | unsigned long alignmask = crypto_ahash_alignmask(tfm); |
187 | int ret; | |
188 | u8 *buffer, *alignbuffer; | |
189 | unsigned long absize; | |
190 | ||
191 | absize = keylen + alignmask; | |
093900c2 | 192 | buffer = kmalloc(absize, GFP_KERNEL); |
004a403c LH |
193 | if (!buffer) |
194 | return -ENOMEM; | |
195 | ||
196 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
197 | memcpy(alignbuffer, key, keylen); | |
a70c5225 | 198 | ret = tfm->setkey(tfm, alignbuffer, keylen); |
8c32c516 | 199 | kzfree(buffer); |
004a403c LH |
200 | return ret; |
201 | } | |
202 | ||
66f6ce5e | 203 | int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key, |
004a403c LH |
204 | unsigned int keylen) |
205 | { | |
004a403c | 206 | unsigned long alignmask = crypto_ahash_alignmask(tfm); |
2f5c85c4 | 207 | int err; |
004a403c LH |
208 | |
209 | if ((unsigned long)key & alignmask) | |
2f5c85c4 EB |
210 | err = ahash_setkey_unaligned(tfm, key, keylen); |
211 | else | |
212 | err = tfm->setkey(tfm, key, keylen); | |
213 | ||
214 | if (err) | |
215 | return err; | |
004a403c | 216 | |
2f5c85c4 EB |
217 | crypto_ahash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY); |
218 | return 0; | |
004a403c | 219 | } |
66f6ce5e | 220 | EXPORT_SYMBOL_GPL(crypto_ahash_setkey); |
004a403c | 221 | |
3751f402 HX |
222 | static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key, |
223 | unsigned int keylen) | |
224 | { | |
225 | return -ENOSYS; | |
226 | } | |
227 | ||
66f6ce5e HX |
228 | static inline unsigned int ahash_align_buffer_size(unsigned len, |
229 | unsigned long mask) | |
230 | { | |
231 | return len + (mask & ~(crypto_tfm_ctx_alignment() - 1)); | |
232 | } | |
233 | ||
1ffc9fbd | 234 | static int ahash_save_req(struct ahash_request *req, crypto_completion_t cplt) |
66f6ce5e HX |
235 | { |
236 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); | |
237 | unsigned long alignmask = crypto_ahash_alignmask(tfm); | |
238 | unsigned int ds = crypto_ahash_digestsize(tfm); | |
239 | struct ahash_request_priv *priv; | |
66f6ce5e HX |
240 | |
241 | priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask), | |
242 | (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? | |
5befbd5a | 243 | GFP_KERNEL : GFP_ATOMIC); |
66f6ce5e HX |
244 | if (!priv) |
245 | return -ENOMEM; | |
246 | ||
ab6bf4e5 MV |
247 | /* |
248 | * WARNING: Voodoo programming below! | |
249 | * | |
250 | * The code below is obscure and hard to understand, thus explanation | |
251 | * is necessary. See include/crypto/hash.h and include/linux/crypto.h | |
252 | * to understand the layout of structures used here! | |
253 | * | |
254 | * The code here will replace portions of the ORIGINAL request with | |
255 | * pointers to new code and buffers so the hashing operation can store | |
256 | * the result in aligned buffer. We will call the modified request | |
257 | * an ADJUSTED request. | |
258 | * | |
259 | * The newly mangled request will look as such: | |
260 | * | |
261 | * req { | |
262 | * .result = ADJUSTED[new aligned buffer] | |
263 | * .base.complete = ADJUSTED[pointer to completion function] | |
264 | * .base.data = ADJUSTED[*req (pointer to self)] | |
265 | * .priv = ADJUSTED[new priv] { | |
266 | * .result = ORIGINAL(result) | |
267 | * .complete = ORIGINAL(base.complete) | |
268 | * .data = ORIGINAL(base.data) | |
269 | * } | |
270 | */ | |
271 | ||
66f6ce5e HX |
272 | priv->result = req->result; |
273 | priv->complete = req->base.complete; | |
274 | priv->data = req->base.data; | |
13af7022 HX |
275 | priv->flags = req->base.flags; |
276 | ||
ab6bf4e5 MV |
277 | /* |
278 | * WARNING: We do not backup req->priv here! The req->priv | |
279 | * is for internal use of the Crypto API and the | |
280 | * user must _NOT_ _EVER_ depend on it's content! | |
281 | */ | |
66f6ce5e HX |
282 | |
283 | req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1); | |
1ffc9fbd | 284 | req->base.complete = cplt; |
66f6ce5e HX |
285 | req->base.data = req; |
286 | req->priv = priv; | |
287 | ||
1ffc9fbd MV |
288 | return 0; |
289 | } | |
290 | ||
13af7022 | 291 | static void ahash_restore_req(struct ahash_request *req, int err) |
1ffc9fbd MV |
292 | { |
293 | struct ahash_request_priv *priv = req->priv; | |
294 | ||
13af7022 HX |
295 | if (!err) |
296 | memcpy(priv->result, req->result, | |
297 | crypto_ahash_digestsize(crypto_ahash_reqtfm(req))); | |
298 | ||
1ffc9fbd MV |
299 | /* Restore the original crypto request. */ |
300 | req->result = priv->result; | |
13af7022 HX |
301 | |
302 | ahash_request_set_callback(req, priv->flags, | |
303 | priv->complete, priv->data); | |
1ffc9fbd MV |
304 | req->priv = NULL; |
305 | ||
306 | /* Free the req->priv.priv from the ADJUSTED request. */ | |
307 | kzfree(priv); | |
308 | } | |
309 | ||
13af7022 | 310 | static void ahash_notify_einprogress(struct ahash_request *req) |
1ffc9fbd MV |
311 | { |
312 | struct ahash_request_priv *priv = req->priv; | |
13af7022 | 313 | struct crypto_async_request oreq; |
1ffc9fbd | 314 | |
13af7022 | 315 | oreq.data = priv->data; |
1ffc9fbd | 316 | |
13af7022 | 317 | priv->complete(&oreq, -EINPROGRESS); |
1ffc9fbd MV |
318 | } |
319 | ||
320 | static void ahash_op_unaligned_done(struct crypto_async_request *req, int err) | |
321 | { | |
322 | struct ahash_request *areq = req->data; | |
323 | ||
13af7022 HX |
324 | if (err == -EINPROGRESS) { |
325 | ahash_notify_einprogress(areq); | |
326 | return; | |
327 | } | |
328 | ||
1ffc9fbd MV |
329 | /* |
330 | * Restore the original request, see ahash_op_unaligned() for what | |
331 | * goes where. | |
332 | * | |
333 | * The "struct ahash_request *req" here is in fact the "req.base" | |
334 | * from the ADJUSTED request from ahash_op_unaligned(), thus as it | |
335 | * is a pointer to self, it is also the ADJUSTED "req" . | |
336 | */ | |
337 | ||
338 | /* First copy req->result into req->priv.result */ | |
13af7022 | 339 | ahash_restore_req(areq, err); |
1ffc9fbd MV |
340 | |
341 | /* Complete the ORIGINAL request. */ | |
342 | areq->base.complete(&areq->base, err); | |
343 | } | |
344 | ||
345 | static int ahash_op_unaligned(struct ahash_request *req, | |
346 | int (*op)(struct ahash_request *)) | |
347 | { | |
348 | int err; | |
349 | ||
350 | err = ahash_save_req(req, ahash_op_unaligned_done); | |
351 | if (err) | |
352 | return err; | |
353 | ||
66f6ce5e | 354 | err = op(req); |
13af7022 HX |
355 | if (err == -EINPROGRESS || |
356 | (err == -EBUSY && (ahash_request_flags(req) & | |
357 | CRYPTO_TFM_REQ_MAY_BACKLOG))) | |
358 | return err; | |
359 | ||
360 | ahash_restore_req(req, err); | |
66f6ce5e HX |
361 | |
362 | return err; | |
363 | } | |
364 | ||
365 | static int crypto_ahash_op(struct ahash_request *req, | |
366 | int (*op)(struct ahash_request *)) | |
367 | { | |
368 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); | |
369 | unsigned long alignmask = crypto_ahash_alignmask(tfm); | |
370 | ||
371 | if ((unsigned long)req->result & alignmask) | |
372 | return ahash_op_unaligned(req, op); | |
373 | ||
374 | return op(req); | |
375 | } | |
376 | ||
377 | int crypto_ahash_final(struct ahash_request *req) | |
378 | { | |
379 | return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final); | |
380 | } | |
381 | EXPORT_SYMBOL_GPL(crypto_ahash_final); | |
382 | ||
383 | int crypto_ahash_finup(struct ahash_request *req) | |
384 | { | |
385 | return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup); | |
386 | } | |
387 | EXPORT_SYMBOL_GPL(crypto_ahash_finup); | |
388 | ||
389 | int crypto_ahash_digest(struct ahash_request *req) | |
390 | { | |
2f5c85c4 EB |
391 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); |
392 | ||
393 | if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) | |
394 | return -ENOKEY; | |
395 | ||
396 | return crypto_ahash_op(req, tfm->digest); | |
66f6ce5e HX |
397 | } |
398 | EXPORT_SYMBOL_GPL(crypto_ahash_digest); | |
399 | ||
13af7022 | 400 | static void ahash_def_finup_done2(struct crypto_async_request *req, int err) |
66f6ce5e | 401 | { |
13af7022 | 402 | struct ahash_request *areq = req->data; |
66f6ce5e HX |
403 | |
404 | if (err == -EINPROGRESS) | |
405 | return; | |
406 | ||
13af7022 | 407 | ahash_restore_req(areq, err); |
66f6ce5e | 408 | |
d4a7a0fb | 409 | areq->base.complete(&areq->base, err); |
66f6ce5e HX |
410 | } |
411 | ||
412 | static int ahash_def_finup_finish1(struct ahash_request *req, int err) | |
413 | { | |
414 | if (err) | |
415 | goto out; | |
416 | ||
417 | req->base.complete = ahash_def_finup_done2; | |
13af7022 | 418 | |
66f6ce5e | 419 | err = crypto_ahash_reqtfm(req)->final(req); |
13af7022 HX |
420 | if (err == -EINPROGRESS || |
421 | (err == -EBUSY && (ahash_request_flags(req) & | |
422 | CRYPTO_TFM_REQ_MAY_BACKLOG))) | |
423 | return err; | |
66f6ce5e HX |
424 | |
425 | out: | |
13af7022 | 426 | ahash_restore_req(req, err); |
66f6ce5e HX |
427 | return err; |
428 | } | |
429 | ||
430 | static void ahash_def_finup_done1(struct crypto_async_request *req, int err) | |
431 | { | |
432 | struct ahash_request *areq = req->data; | |
66f6ce5e | 433 | |
13af7022 HX |
434 | if (err == -EINPROGRESS) { |
435 | ahash_notify_einprogress(areq); | |
436 | return; | |
437 | } | |
438 | ||
439 | areq->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; | |
440 | ||
66f6ce5e | 441 | err = ahash_def_finup_finish1(areq, err); |
13af7022 HX |
442 | if (areq->priv) |
443 | return; | |
66f6ce5e | 444 | |
d4a7a0fb | 445 | areq->base.complete(&areq->base, err); |
66f6ce5e HX |
446 | } |
447 | ||
448 | static int ahash_def_finup(struct ahash_request *req) | |
449 | { | |
450 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); | |
d4a7a0fb | 451 | int err; |
66f6ce5e | 452 | |
d4a7a0fb MV |
453 | err = ahash_save_req(req, ahash_def_finup_done1); |
454 | if (err) | |
455 | return err; | |
66f6ce5e | 456 | |
d4a7a0fb | 457 | err = tfm->update(req); |
13af7022 HX |
458 | if (err == -EINPROGRESS || |
459 | (err == -EBUSY && (ahash_request_flags(req) & | |
460 | CRYPTO_TFM_REQ_MAY_BACKLOG))) | |
461 | return err; | |
462 | ||
d4a7a0fb | 463 | return ahash_def_finup_finish1(req, err); |
66f6ce5e HX |
464 | } |
465 | ||
466 | static int ahash_no_export(struct ahash_request *req, void *out) | |
467 | { | |
468 | return -ENOSYS; | |
469 | } | |
470 | ||
471 | static int ahash_no_import(struct ahash_request *req, const void *in) | |
472 | { | |
473 | return -ENOSYS; | |
474 | } | |
475 | ||
88056ec3 HX |
476 | static int crypto_ahash_init_tfm(struct crypto_tfm *tfm) |
477 | { | |
478 | struct crypto_ahash *hash = __crypto_ahash_cast(tfm); | |
479 | struct ahash_alg *alg = crypto_ahash_alg(hash); | |
88056ec3 | 480 | |
66f6ce5e HX |
481 | hash->setkey = ahash_nosetkey; |
482 | hash->export = ahash_no_export; | |
483 | hash->import = ahash_no_import; | |
484 | ||
88056ec3 HX |
485 | if (tfm->__crt_alg->cra_type != &crypto_ahash_type) |
486 | return crypto_init_shash_ops_async(tfm); | |
487 | ||
88056ec3 HX |
488 | hash->init = alg->init; |
489 | hash->update = alg->update; | |
66f6ce5e HX |
490 | hash->final = alg->final; |
491 | hash->finup = alg->finup ?: ahash_def_finup; | |
88056ec3 | 492 | hash->digest = alg->digest; |
66f6ce5e | 493 | |
2a8bef7a | 494 | if (alg->setkey) { |
66f6ce5e | 495 | hash->setkey = alg->setkey; |
2f5c85c4 EB |
496 | if (!(alg->halg.base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY)) |
497 | crypto_ahash_set_flags(hash, CRYPTO_TFM_NEED_KEY); | |
2a8bef7a | 498 | } |
66f6ce5e HX |
499 | if (alg->export) |
500 | hash->export = alg->export; | |
501 | if (alg->import) | |
502 | hash->import = alg->import; | |
88056ec3 HX |
503 | |
504 | return 0; | |
505 | } | |
506 | ||
507 | static unsigned int crypto_ahash_extsize(struct crypto_alg *alg) | |
508 | { | |
509 | if (alg->cra_type == &crypto_ahash_type) | |
510 | return alg->cra_ctxsize; | |
511 | ||
512 | return sizeof(struct crypto_shash *); | |
513 | } | |
514 | ||
3acc8473 | 515 | #ifdef CONFIG_NET |
6238cbae SK |
516 | static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg) |
517 | { | |
518 | struct crypto_report_hash rhash; | |
519 | ||
9a5467bf | 520 | strncpy(rhash.type, "ahash", sizeof(rhash.type)); |
6238cbae SK |
521 | |
522 | rhash.blocksize = alg->cra_blocksize; | |
523 | rhash.digestsize = __crypto_hash_alg_common(alg)->digestsize; | |
524 | ||
6662df33 DM |
525 | if (nla_put(skb, CRYPTOCFGA_REPORT_HASH, |
526 | sizeof(struct crypto_report_hash), &rhash)) | |
527 | goto nla_put_failure; | |
6238cbae SK |
528 | return 0; |
529 | ||
530 | nla_put_failure: | |
531 | return -EMSGSIZE; | |
532 | } | |
3acc8473 HX |
533 | #else |
534 | static int crypto_ahash_report(struct sk_buff *skb, struct crypto_alg *alg) | |
535 | { | |
536 | return -ENOSYS; | |
537 | } | |
538 | #endif | |
6238cbae | 539 | |
004a403c LH |
540 | static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg) |
541 | __attribute__ ((unused)); | |
542 | static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg) | |
543 | { | |
544 | seq_printf(m, "type : ahash\n"); | |
545 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? | |
546 | "yes" : "no"); | |
547 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
88056ec3 HX |
548 | seq_printf(m, "digestsize : %u\n", |
549 | __crypto_hash_alg_common(alg)->digestsize); | |
004a403c LH |
550 | } |
551 | ||
552 | const struct crypto_type crypto_ahash_type = { | |
88056ec3 HX |
553 | .extsize = crypto_ahash_extsize, |
554 | .init_tfm = crypto_ahash_init_tfm, | |
004a403c LH |
555 | #ifdef CONFIG_PROC_FS |
556 | .show = crypto_ahash_show, | |
557 | #endif | |
6238cbae | 558 | .report = crypto_ahash_report, |
88056ec3 HX |
559 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, |
560 | .maskset = CRYPTO_ALG_TYPE_AHASH_MASK, | |
561 | .type = CRYPTO_ALG_TYPE_AHASH, | |
562 | .tfmsize = offsetof(struct crypto_ahash, base), | |
004a403c LH |
563 | }; |
564 | EXPORT_SYMBOL_GPL(crypto_ahash_type); | |
565 | ||
88056ec3 HX |
566 | struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type, |
567 | u32 mask) | |
568 | { | |
569 | return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask); | |
570 | } | |
571 | EXPORT_SYMBOL_GPL(crypto_alloc_ahash); | |
572 | ||
01c2dece HX |
573 | static int ahash_prepare_alg(struct ahash_alg *alg) |
574 | { | |
575 | struct crypto_alg *base = &alg->halg.base; | |
576 | ||
577 | if (alg->halg.digestsize > PAGE_SIZE / 8 || | |
c8268b5b RK |
578 | alg->halg.statesize > PAGE_SIZE / 8 || |
579 | alg->halg.statesize == 0) | |
01c2dece HX |
580 | return -EINVAL; |
581 | ||
582 | base->cra_type = &crypto_ahash_type; | |
583 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; | |
584 | base->cra_flags |= CRYPTO_ALG_TYPE_AHASH; | |
585 | ||
586 | return 0; | |
587 | } | |
588 | ||
589 | int crypto_register_ahash(struct ahash_alg *alg) | |
590 | { | |
591 | struct crypto_alg *base = &alg->halg.base; | |
592 | int err; | |
593 | ||
594 | err = ahash_prepare_alg(alg); | |
595 | if (err) | |
596 | return err; | |
597 | ||
598 | return crypto_register_alg(base); | |
599 | } | |
600 | EXPORT_SYMBOL_GPL(crypto_register_ahash); | |
601 | ||
602 | int crypto_unregister_ahash(struct ahash_alg *alg) | |
603 | { | |
604 | return crypto_unregister_alg(&alg->halg.base); | |
605 | } | |
606 | EXPORT_SYMBOL_GPL(crypto_unregister_ahash); | |
607 | ||
608 | int ahash_register_instance(struct crypto_template *tmpl, | |
609 | struct ahash_instance *inst) | |
610 | { | |
611 | int err; | |
612 | ||
613 | err = ahash_prepare_alg(&inst->alg); | |
614 | if (err) | |
615 | return err; | |
616 | ||
617 | return crypto_register_instance(tmpl, ahash_crypto_instance(inst)); | |
618 | } | |
619 | EXPORT_SYMBOL_GPL(ahash_register_instance); | |
620 | ||
621 | void ahash_free_instance(struct crypto_instance *inst) | |
622 | { | |
623 | crypto_drop_spawn(crypto_instance_ctx(inst)); | |
624 | kfree(ahash_instance(inst)); | |
625 | } | |
626 | EXPORT_SYMBOL_GPL(ahash_free_instance); | |
627 | ||
628 | int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn, | |
629 | struct hash_alg_common *alg, | |
630 | struct crypto_instance *inst) | |
631 | { | |
632 | return crypto_init_spawn2(&spawn->base, &alg->base, inst, | |
633 | &crypto_ahash_type); | |
634 | } | |
635 | EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn); | |
636 | ||
637 | struct hash_alg_common *ahash_attr_alg(struct rtattr *rta, u32 type, u32 mask) | |
638 | { | |
639 | struct crypto_alg *alg; | |
640 | ||
641 | alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask); | |
642 | return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg); | |
643 | } | |
644 | EXPORT_SYMBOL_GPL(ahash_attr_alg); | |
645 | ||
6b3aa7a9 EB |
646 | bool crypto_hash_alg_has_setkey(struct hash_alg_common *halg) |
647 | { | |
648 | struct crypto_alg *alg = &halg->base; | |
649 | ||
650 | if (alg->cra_type != &crypto_ahash_type) | |
651 | return crypto_shash_alg_has_setkey(__crypto_shash_alg(alg)); | |
652 | ||
653 | return __crypto_ahash_alg(alg)->setkey != NULL; | |
654 | } | |
655 | EXPORT_SYMBOL_GPL(crypto_hash_alg_has_setkey); | |
656 | ||
004a403c LH |
657 | MODULE_LICENSE("GPL"); |
658 | MODULE_DESCRIPTION("Asynchronous cryptographic hash type"); |