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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/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> |
24 | |
25 | #include "internal.h" |
26 | |
27 | struct ahash_request_priv { |
28 | crypto_completion_t complete; |
29 | void *data; |
30 | u8 *result; |
31 | void *ubuf[] CRYPTO_MINALIGN_ATTR; |
32 | }; |
33 | |
34 | static inline struct ahash_alg *crypto_ahash_alg(struct crypto_ahash *hash) |
35 | { |
36 | return container_of(crypto_hash_alg_common(hash), struct ahash_alg, |
37 | halg); |
38 | } |
39 | |
40 | static int hash_walk_next(struct crypto_hash_walk *walk) |
41 | { |
42 | unsigned int alignmask = walk->alignmask; |
43 | unsigned int offset = walk->offset; |
44 | unsigned int nbytes = min(walk->entrylen, |
45 | ((unsigned int)(PAGE_SIZE)) - offset); |
46 | |
47 | walk->data = crypto_kmap(walk->pg, 0); |
48 | walk->data += offset; |
49 | |
50 | if (offset & alignmask) |
51 | nbytes = alignmask + 1 - (offset & alignmask); |
52 | |
53 | walk->entrylen -= nbytes; |
54 | return nbytes; |
55 | } |
56 | |
57 | static int hash_walk_new_entry(struct crypto_hash_walk *walk) |
58 | { |
59 | struct scatterlist *sg; |
60 | |
61 | sg = walk->sg; |
62 | walk->pg = sg_page(sg); |
63 | walk->offset = sg->offset; |
64 | walk->entrylen = sg->length; |
65 | |
66 | if (walk->entrylen > walk->total) |
67 | walk->entrylen = walk->total; |
68 | walk->total -= walk->entrylen; |
69 | |
70 | return hash_walk_next(walk); |
71 | } |
72 | |
73 | int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err) |
74 | { |
75 | unsigned int alignmask = walk->alignmask; |
76 | unsigned int nbytes = walk->entrylen; |
77 | |
78 | walk->data -= walk->offset; |
79 | |
80 | if (nbytes && walk->offset & alignmask && !err) { |
81 | walk->offset = ALIGN(walk->offset, alignmask + 1); |
82 | walk->data += walk->offset; |
83 | |
84 | nbytes = min(nbytes, |
85 | ((unsigned int)(PAGE_SIZE)) - walk->offset); |
86 | walk->entrylen -= nbytes; |
87 | |
88 | return nbytes; |
89 | } |
90 | |
91 | crypto_kunmap(walk->data, 0); |
92 | crypto_yield(walk->flags); |
93 | |
94 | if (err) |
95 | return err; |
96 | |
97 | if (nbytes) { |
98 | walk->offset = 0; |
99 | walk->pg++; |
100 | return hash_walk_next(walk); |
101 | } |
102 | |
103 | if (!walk->total) |
104 | return 0; |
105 | |
106 | walk->sg = scatterwalk_sg_next(walk->sg); |
107 | |
108 | return hash_walk_new_entry(walk); |
109 | } |
110 | EXPORT_SYMBOL_GPL(crypto_hash_walk_done); |
111 | |
112 | int crypto_hash_walk_first(struct ahash_request *req, |
113 | struct crypto_hash_walk *walk) |
114 | { |
115 | walk->total = req->nbytes; |
116 | |
117 | if (!walk->total) |
118 | return 0; |
119 | |
120 | walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req)); |
121 | walk->sg = req->src; |
122 | walk->flags = req->base.flags; |
123 | |
124 | return hash_walk_new_entry(walk); |
125 | } |
126 | EXPORT_SYMBOL_GPL(crypto_hash_walk_first); |
127 | |
128 | int crypto_hash_walk_first_compat(struct hash_desc *hdesc, |
129 | struct crypto_hash_walk *walk, |
130 | struct scatterlist *sg, unsigned int len) |
131 | { |
132 | walk->total = len; |
133 | |
134 | if (!walk->total) |
135 | return 0; |
136 | |
137 | walk->alignmask = crypto_hash_alignmask(hdesc->tfm); |
138 | walk->sg = sg; |
139 | walk->flags = hdesc->flags; |
140 | |
141 | return hash_walk_new_entry(walk); |
142 | } |
143 | |
144 | static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key, |
145 | unsigned int keylen) |
146 | { |
147 | unsigned long alignmask = crypto_ahash_alignmask(tfm); |
148 | int ret; |
149 | u8 *buffer, *alignbuffer; |
150 | unsigned long absize; |
151 | |
152 | absize = keylen + alignmask; |
153 | buffer = kmalloc(absize, GFP_KERNEL); |
154 | if (!buffer) |
155 | return -ENOMEM; |
156 | |
157 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); |
158 | memcpy(alignbuffer, key, keylen); |
159 | ret = tfm->setkey(tfm, alignbuffer, keylen); |
160 | kzfree(buffer); |
161 | return ret; |
162 | } |
163 | |
164 | int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key, |
165 | unsigned int keylen) |
166 | { |
167 | unsigned long alignmask = crypto_ahash_alignmask(tfm); |
168 | |
169 | if ((unsigned long)key & alignmask) |
170 | return ahash_setkey_unaligned(tfm, key, keylen); |
171 | |
172 | return tfm->setkey(tfm, key, keylen); |
173 | } |
174 | EXPORT_SYMBOL_GPL(crypto_ahash_setkey); |
175 | |
176 | static int ahash_nosetkey(struct crypto_ahash *tfm, const u8 *key, |
177 | unsigned int keylen) |
178 | { |
179 | return -ENOSYS; |
180 | } |
181 | |
182 | static inline unsigned int ahash_align_buffer_size(unsigned len, |
183 | unsigned long mask) |
184 | { |
185 | return len + (mask & ~(crypto_tfm_ctx_alignment() - 1)); |
186 | } |
187 | |
188 | static void ahash_op_unaligned_finish(struct ahash_request *req, int err) |
189 | { |
190 | struct ahash_request_priv *priv = req->priv; |
191 | |
192 | if (err == -EINPROGRESS) |
193 | return; |
194 | |
195 | if (!err) |
196 | memcpy(priv->result, req->result, |
197 | crypto_ahash_digestsize(crypto_ahash_reqtfm(req))); |
198 | |
199 | kzfree(priv); |
200 | } |
201 | |
202 | static void ahash_op_unaligned_done(struct crypto_async_request *req, int err) |
203 | { |
204 | struct ahash_request *areq = req->data; |
205 | struct ahash_request_priv *priv = areq->priv; |
206 | crypto_completion_t complete = priv->complete; |
207 | void *data = priv->data; |
208 | |
209 | ahash_op_unaligned_finish(areq, err); |
210 | |
211 | complete(data, err); |
212 | } |
213 | |
214 | static int ahash_op_unaligned(struct ahash_request *req, |
215 | int (*op)(struct ahash_request *)) |
216 | { |
217 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); |
218 | unsigned long alignmask = crypto_ahash_alignmask(tfm); |
219 | unsigned int ds = crypto_ahash_digestsize(tfm); |
220 | struct ahash_request_priv *priv; |
221 | int err; |
222 | |
223 | priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask), |
224 | (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? |
225 | GFP_KERNEL : GFP_ATOMIC); |
226 | if (!priv) |
227 | return -ENOMEM; |
228 | |
229 | priv->result = req->result; |
230 | priv->complete = req->base.complete; |
231 | priv->data = req->base.data; |
232 | |
233 | req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1); |
234 | req->base.complete = ahash_op_unaligned_done; |
235 | req->base.data = req; |
236 | req->priv = priv; |
237 | |
238 | err = op(req); |
239 | ahash_op_unaligned_finish(req, err); |
240 | |
241 | return err; |
242 | } |
243 | |
244 | static int crypto_ahash_op(struct ahash_request *req, |
245 | int (*op)(struct ahash_request *)) |
246 | { |
247 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); |
248 | unsigned long alignmask = crypto_ahash_alignmask(tfm); |
249 | |
250 | if ((unsigned long)req->result & alignmask) |
251 | return ahash_op_unaligned(req, op); |
252 | |
253 | return op(req); |
254 | } |
255 | |
256 | int crypto_ahash_final(struct ahash_request *req) |
257 | { |
258 | return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->final); |
259 | } |
260 | EXPORT_SYMBOL_GPL(crypto_ahash_final); |
261 | |
262 | int crypto_ahash_finup(struct ahash_request *req) |
263 | { |
264 | return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->finup); |
265 | } |
266 | EXPORT_SYMBOL_GPL(crypto_ahash_finup); |
267 | |
268 | int crypto_ahash_digest(struct ahash_request *req) |
269 | { |
270 | return crypto_ahash_op(req, crypto_ahash_reqtfm(req)->digest); |
271 | } |
272 | EXPORT_SYMBOL_GPL(crypto_ahash_digest); |
273 | |
274 | static void ahash_def_finup_finish2(struct ahash_request *req, int err) |
275 | { |
276 | struct ahash_request_priv *priv = req->priv; |
277 | |
278 | if (err == -EINPROGRESS) |
279 | return; |
280 | |
281 | if (!err) |
282 | memcpy(priv->result, req->result, |
283 | crypto_ahash_digestsize(crypto_ahash_reqtfm(req))); |
284 | |
285 | kzfree(priv); |
286 | } |
287 | |
288 | static void ahash_def_finup_done2(struct crypto_async_request *req, int err) |
289 | { |
290 | struct ahash_request *areq = req->data; |
291 | struct ahash_request_priv *priv = areq->priv; |
292 | crypto_completion_t complete = priv->complete; |
293 | void *data = priv->data; |
294 | |
295 | ahash_def_finup_finish2(areq, err); |
296 | |
297 | complete(data, err); |
298 | } |
299 | |
300 | static int ahash_def_finup_finish1(struct ahash_request *req, int err) |
301 | { |
302 | if (err) |
303 | goto out; |
304 | |
305 | req->base.complete = ahash_def_finup_done2; |
306 | req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; |
307 | err = crypto_ahash_reqtfm(req)->final(req); |
308 | |
309 | out: |
310 | ahash_def_finup_finish2(req, err); |
311 | return err; |
312 | } |
313 | |
314 | static void ahash_def_finup_done1(struct crypto_async_request *req, int err) |
315 | { |
316 | struct ahash_request *areq = req->data; |
317 | struct ahash_request_priv *priv = areq->priv; |
318 | crypto_completion_t complete = priv->complete; |
319 | void *data = priv->data; |
320 | |
321 | err = ahash_def_finup_finish1(areq, err); |
322 | |
323 | complete(data, err); |
324 | } |
325 | |
326 | static int ahash_def_finup(struct ahash_request *req) |
327 | { |
328 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); |
329 | unsigned long alignmask = crypto_ahash_alignmask(tfm); |
330 | unsigned int ds = crypto_ahash_digestsize(tfm); |
331 | struct ahash_request_priv *priv; |
332 | |
333 | priv = kmalloc(sizeof(*priv) + ahash_align_buffer_size(ds, alignmask), |
334 | (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? |
335 | GFP_KERNEL : GFP_ATOMIC); |
336 | if (!priv) |
337 | return -ENOMEM; |
338 | |
339 | priv->result = req->result; |
340 | priv->complete = req->base.complete; |
341 | priv->data = req->base.data; |
342 | |
343 | req->result = PTR_ALIGN((u8 *)priv->ubuf, alignmask + 1); |
344 | req->base.complete = ahash_def_finup_done1; |
345 | req->base.data = req; |
346 | req->priv = priv; |
347 | |
348 | return ahash_def_finup_finish1(req, tfm->update(req)); |
349 | } |
350 | |
351 | static int ahash_no_export(struct ahash_request *req, void *out) |
352 | { |
353 | return -ENOSYS; |
354 | } |
355 | |
356 | static int ahash_no_import(struct ahash_request *req, const void *in) |
357 | { |
358 | return -ENOSYS; |
359 | } |
360 | |
361 | static int crypto_ahash_init_tfm(struct crypto_tfm *tfm) |
362 | { |
363 | struct crypto_ahash *hash = __crypto_ahash_cast(tfm); |
364 | struct ahash_alg *alg = crypto_ahash_alg(hash); |
365 | |
366 | hash->setkey = ahash_nosetkey; |
367 | hash->export = ahash_no_export; |
368 | hash->import = ahash_no_import; |
369 | |
370 | if (tfm->__crt_alg->cra_type != &crypto_ahash_type) |
371 | return crypto_init_shash_ops_async(tfm); |
372 | |
373 | hash->init = alg->init; |
374 | hash->update = alg->update; |
375 | hash->final = alg->final; |
376 | hash->finup = alg->finup ?: ahash_def_finup; |
377 | hash->digest = alg->digest; |
378 | |
379 | if (alg->setkey) |
380 | hash->setkey = alg->setkey; |
381 | if (alg->export) |
382 | hash->export = alg->export; |
383 | if (alg->import) |
384 | hash->import = alg->import; |
385 | |
386 | return 0; |
387 | } |
388 | |
389 | static unsigned int crypto_ahash_extsize(struct crypto_alg *alg) |
390 | { |
391 | if (alg->cra_type == &crypto_ahash_type) |
392 | return alg->cra_ctxsize; |
393 | |
394 | return sizeof(struct crypto_shash *); |
395 | } |
396 | |
397 | static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg) |
398 | __attribute__ ((unused)); |
399 | static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg) |
400 | { |
401 | seq_printf(m, "type : ahash\n"); |
402 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? |
403 | "yes" : "no"); |
404 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); |
405 | seq_printf(m, "digestsize : %u\n", |
406 | __crypto_hash_alg_common(alg)->digestsize); |
407 | } |
408 | |
409 | const struct crypto_type crypto_ahash_type = { |
410 | .extsize = crypto_ahash_extsize, |
411 | .init_tfm = crypto_ahash_init_tfm, |
412 | #ifdef CONFIG_PROC_FS |
413 | .show = crypto_ahash_show, |
414 | #endif |
415 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, |
416 | .maskset = CRYPTO_ALG_TYPE_AHASH_MASK, |
417 | .type = CRYPTO_ALG_TYPE_AHASH, |
418 | .tfmsize = offsetof(struct crypto_ahash, base), |
419 | }; |
420 | EXPORT_SYMBOL_GPL(crypto_ahash_type); |
421 | |
422 | struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type, |
423 | u32 mask) |
424 | { |
425 | return crypto_alloc_tfm(alg_name, &crypto_ahash_type, type, mask); |
426 | } |
427 | EXPORT_SYMBOL_GPL(crypto_alloc_ahash); |
428 | |
429 | static int ahash_prepare_alg(struct ahash_alg *alg) |
430 | { |
431 | struct crypto_alg *base = &alg->halg.base; |
432 | |
433 | if (alg->halg.digestsize > PAGE_SIZE / 8 || |
434 | alg->halg.statesize > PAGE_SIZE / 8) |
435 | return -EINVAL; |
436 | |
437 | base->cra_type = &crypto_ahash_type; |
438 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; |
439 | base->cra_flags |= CRYPTO_ALG_TYPE_AHASH; |
440 | |
441 | return 0; |
442 | } |
443 | |
444 | int crypto_register_ahash(struct ahash_alg *alg) |
445 | { |
446 | struct crypto_alg *base = &alg->halg.base; |
447 | int err; |
448 | |
449 | err = ahash_prepare_alg(alg); |
450 | if (err) |
451 | return err; |
452 | |
453 | return crypto_register_alg(base); |
454 | } |
455 | EXPORT_SYMBOL_GPL(crypto_register_ahash); |
456 | |
457 | int crypto_unregister_ahash(struct ahash_alg *alg) |
458 | { |
459 | return crypto_unregister_alg(&alg->halg.base); |
460 | } |
461 | EXPORT_SYMBOL_GPL(crypto_unregister_ahash); |
462 | |
463 | int ahash_register_instance(struct crypto_template *tmpl, |
464 | struct ahash_instance *inst) |
465 | { |
466 | int err; |
467 | |
468 | err = ahash_prepare_alg(&inst->alg); |
469 | if (err) |
470 | return err; |
471 | |
472 | return crypto_register_instance(tmpl, ahash_crypto_instance(inst)); |
473 | } |
474 | EXPORT_SYMBOL_GPL(ahash_register_instance); |
475 | |
476 | void ahash_free_instance(struct crypto_instance *inst) |
477 | { |
478 | crypto_drop_spawn(crypto_instance_ctx(inst)); |
479 | kfree(ahash_instance(inst)); |
480 | } |
481 | EXPORT_SYMBOL_GPL(ahash_free_instance); |
482 | |
483 | int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn, |
484 | struct hash_alg_common *alg, |
485 | struct crypto_instance *inst) |
486 | { |
487 | return crypto_init_spawn2(&spawn->base, &alg->base, inst, |
488 | &crypto_ahash_type); |
489 | } |
490 | EXPORT_SYMBOL_GPL(crypto_init_ahash_spawn); |
491 | |
492 | struct hash_alg_common *ahash_attr_alg(struct rtattr *rta, u32 type, u32 mask) |
493 | { |
494 | struct crypto_alg *alg; |
495 | |
496 | alg = crypto_attr_alg2(rta, &crypto_ahash_type, type, mask); |
497 | return IS_ERR(alg) ? ERR_CAST(alg) : __crypto_hash_alg_common(alg); |
498 | } |
499 | EXPORT_SYMBOL_GPL(ahash_attr_alg); |
500 | |
501 | MODULE_LICENSE("GPL"); |
502 | MODULE_DESCRIPTION("Asynchronous cryptographic hash type"); |
503 |
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