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Commit | Line | Data |
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1 | /* | |
2 | * Synchronous Cryptographic Hash operations. | |
3 | * | |
4 | * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the Free | |
8 | * Software Foundation; either version 2 of the License, or (at your option) | |
9 | * any later version. | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <crypto/scatterwalk.h> | |
14 | #include <crypto/internal/hash.h> | |
15 | #include <linux/err.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/seq_file.h> | |
20 | ||
21 | #include "internal.h" | |
22 | ||
23 | static const struct crypto_type crypto_shash_type; | |
24 | ||
25 | static int shash_no_setkey(struct crypto_shash *tfm, const u8 *key, | |
26 | unsigned int keylen) | |
27 | { | |
28 | return -ENOSYS; | |
29 | } | |
30 | ||
31 | static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key, | |
32 | unsigned int keylen) | |
33 | { | |
34 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
35 | unsigned long alignmask = crypto_shash_alignmask(tfm); | |
36 | unsigned long absize; | |
37 | u8 *buffer, *alignbuffer; | |
38 | int err; | |
39 | ||
40 | absize = keylen + (alignmask & ~(CRYPTO_MINALIGN - 1)); | |
41 | buffer = kmalloc(absize, GFP_KERNEL); | |
42 | if (!buffer) | |
43 | return -ENOMEM; | |
44 | ||
45 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
46 | memcpy(alignbuffer, key, keylen); | |
47 | err = shash->setkey(tfm, alignbuffer, keylen); | |
48 | memset(alignbuffer, 0, keylen); | |
49 | kfree(buffer); | |
50 | return err; | |
51 | } | |
52 | ||
53 | int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key, | |
54 | unsigned int keylen) | |
55 | { | |
56 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
57 | unsigned long alignmask = crypto_shash_alignmask(tfm); | |
58 | ||
59 | if ((unsigned long)key & alignmask) | |
60 | return shash_setkey_unaligned(tfm, key, keylen); | |
61 | ||
62 | return shash->setkey(tfm, key, keylen); | |
63 | } | |
64 | EXPORT_SYMBOL_GPL(crypto_shash_setkey); | |
65 | ||
66 | static inline unsigned int shash_align_buffer_size(unsigned len, | |
67 | unsigned long mask) | |
68 | { | |
69 | return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1)); | |
70 | } | |
71 | ||
72 | static int shash_update_unaligned(struct shash_desc *desc, const u8 *data, | |
73 | unsigned int len) | |
74 | { | |
75 | struct crypto_shash *tfm = desc->tfm; | |
76 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
77 | unsigned long alignmask = crypto_shash_alignmask(tfm); | |
78 | unsigned int unaligned_len = alignmask + 1 - | |
79 | ((unsigned long)data & alignmask); | |
80 | u8 buf[shash_align_buffer_size(unaligned_len, alignmask)] | |
81 | __attribute__ ((aligned)); | |
82 | ||
83 | if (unaligned_len > len) | |
84 | unaligned_len = len; | |
85 | ||
86 | memcpy(buf, data, unaligned_len); | |
87 | ||
88 | return shash->update(desc, buf, unaligned_len) ?: | |
89 | shash->update(desc, data + unaligned_len, len - unaligned_len); | |
90 | } | |
91 | ||
92 | int crypto_shash_update(struct shash_desc *desc, const u8 *data, | |
93 | unsigned int len) | |
94 | { | |
95 | struct crypto_shash *tfm = desc->tfm; | |
96 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
97 | unsigned long alignmask = crypto_shash_alignmask(tfm); | |
98 | ||
99 | if ((unsigned long)data & alignmask) | |
100 | return shash_update_unaligned(desc, data, len); | |
101 | ||
102 | return shash->update(desc, data, len); | |
103 | } | |
104 | EXPORT_SYMBOL_GPL(crypto_shash_update); | |
105 | ||
106 | static int shash_final_unaligned(struct shash_desc *desc, u8 *out) | |
107 | { | |
108 | struct crypto_shash *tfm = desc->tfm; | |
109 | unsigned long alignmask = crypto_shash_alignmask(tfm); | |
110 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
111 | unsigned int ds = crypto_shash_digestsize(tfm); | |
112 | u8 buf[shash_align_buffer_size(ds, alignmask)] | |
113 | __attribute__ ((aligned)); | |
114 | int err; | |
115 | ||
116 | err = shash->final(desc, buf); | |
117 | memcpy(out, buf, ds); | |
118 | return err; | |
119 | } | |
120 | ||
121 | int crypto_shash_final(struct shash_desc *desc, u8 *out) | |
122 | { | |
123 | struct crypto_shash *tfm = desc->tfm; | |
124 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
125 | unsigned long alignmask = crypto_shash_alignmask(tfm); | |
126 | ||
127 | if ((unsigned long)out & alignmask) | |
128 | return shash_final_unaligned(desc, out); | |
129 | ||
130 | return shash->final(desc, out); | |
131 | } | |
132 | EXPORT_SYMBOL_GPL(crypto_shash_final); | |
133 | ||
134 | static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data, | |
135 | unsigned int len, u8 *out) | |
136 | { | |
137 | return crypto_shash_update(desc, data, len) ?: | |
138 | crypto_shash_final(desc, out); | |
139 | } | |
140 | ||
141 | int crypto_shash_finup(struct shash_desc *desc, const u8 *data, | |
142 | unsigned int len, u8 *out) | |
143 | { | |
144 | struct crypto_shash *tfm = desc->tfm; | |
145 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
146 | unsigned long alignmask = crypto_shash_alignmask(tfm); | |
147 | ||
148 | if (((unsigned long)data | (unsigned long)out) & alignmask) | |
149 | return shash_finup_unaligned(desc, data, len, out); | |
150 | ||
151 | return shash->finup(desc, data, len, out); | |
152 | } | |
153 | EXPORT_SYMBOL_GPL(crypto_shash_finup); | |
154 | ||
155 | static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data, | |
156 | unsigned int len, u8 *out) | |
157 | { | |
158 | return crypto_shash_init(desc) ?: | |
159 | crypto_shash_finup(desc, data, len, out); | |
160 | } | |
161 | ||
162 | int crypto_shash_digest(struct shash_desc *desc, const u8 *data, | |
163 | unsigned int len, u8 *out) | |
164 | { | |
165 | struct crypto_shash *tfm = desc->tfm; | |
166 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
167 | unsigned long alignmask = crypto_shash_alignmask(tfm); | |
168 | ||
169 | if (((unsigned long)data | (unsigned long)out) & alignmask) | |
170 | return shash_digest_unaligned(desc, data, len, out); | |
171 | ||
172 | return shash->digest(desc, data, len, out); | |
173 | } | |
174 | EXPORT_SYMBOL_GPL(crypto_shash_digest); | |
175 | ||
176 | static int shash_no_export(struct shash_desc *desc, void *out) | |
177 | { | |
178 | return -ENOSYS; | |
179 | } | |
180 | ||
181 | static int shash_no_import(struct shash_desc *desc, const void *in) | |
182 | { | |
183 | return -ENOSYS; | |
184 | } | |
185 | ||
186 | static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key, | |
187 | unsigned int keylen) | |
188 | { | |
189 | struct crypto_shash **ctx = crypto_ahash_ctx(tfm); | |
190 | ||
191 | return crypto_shash_setkey(*ctx, key, keylen); | |
192 | } | |
193 | ||
194 | static int shash_async_init(struct ahash_request *req) | |
195 | { | |
196 | struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); | |
197 | struct shash_desc *desc = ahash_request_ctx(req); | |
198 | ||
199 | desc->tfm = *ctx; | |
200 | desc->flags = req->base.flags; | |
201 | ||
202 | return crypto_shash_init(desc); | |
203 | } | |
204 | ||
205 | int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc) | |
206 | { | |
207 | struct crypto_hash_walk walk; | |
208 | int nbytes; | |
209 | ||
210 | for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0; | |
211 | nbytes = crypto_hash_walk_done(&walk, nbytes)) | |
212 | nbytes = crypto_shash_update(desc, walk.data, nbytes); | |
213 | ||
214 | return nbytes; | |
215 | } | |
216 | EXPORT_SYMBOL_GPL(shash_ahash_update); | |
217 | ||
218 | static int shash_async_update(struct ahash_request *req) | |
219 | { | |
220 | return shash_ahash_update(req, ahash_request_ctx(req)); | |
221 | } | |
222 | ||
223 | static int shash_async_final(struct ahash_request *req) | |
224 | { | |
225 | return crypto_shash_final(ahash_request_ctx(req), req->result); | |
226 | } | |
227 | ||
228 | int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc) | |
229 | { | |
230 | struct scatterlist *sg = req->src; | |
231 | unsigned int offset = sg->offset; | |
232 | unsigned int nbytes = req->nbytes; | |
233 | int err; | |
234 | ||
235 | if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) { | |
236 | void *data; | |
237 | ||
238 | data = crypto_kmap(sg_page(sg), 0); | |
239 | err = crypto_shash_digest(desc, data + offset, nbytes, | |
240 | req->result); | |
241 | crypto_kunmap(data, 0); | |
242 | crypto_yield(desc->flags); | |
243 | } else | |
244 | err = crypto_shash_init(desc) ?: | |
245 | shash_ahash_update(req, desc) ?: | |
246 | crypto_shash_final(desc, req->result); | |
247 | ||
248 | return err; | |
249 | } | |
250 | EXPORT_SYMBOL_GPL(shash_ahash_digest); | |
251 | ||
252 | static int shash_async_digest(struct ahash_request *req) | |
253 | { | |
254 | struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); | |
255 | struct shash_desc *desc = ahash_request_ctx(req); | |
256 | ||
257 | desc->tfm = *ctx; | |
258 | desc->flags = req->base.flags; | |
259 | ||
260 | return shash_ahash_digest(req, desc); | |
261 | } | |
262 | ||
263 | static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm) | |
264 | { | |
265 | struct crypto_shash **ctx = crypto_tfm_ctx(tfm); | |
266 | ||
267 | crypto_free_shash(*ctx); | |
268 | } | |
269 | ||
270 | static int crypto_init_shash_ops_async(struct crypto_tfm *tfm) | |
271 | { | |
272 | struct crypto_alg *calg = tfm->__crt_alg; | |
273 | struct shash_alg *alg = __crypto_shash_alg(calg); | |
274 | struct ahash_tfm *crt = &tfm->crt_ahash; | |
275 | struct crypto_shash **ctx = crypto_tfm_ctx(tfm); | |
276 | struct crypto_shash *shash; | |
277 | ||
278 | if (!crypto_mod_get(calg)) | |
279 | return -EAGAIN; | |
280 | ||
281 | shash = crypto_create_tfm(calg, &crypto_shash_type); | |
282 | if (IS_ERR(shash)) { | |
283 | crypto_mod_put(calg); | |
284 | return PTR_ERR(shash); | |
285 | } | |
286 | ||
287 | *ctx = shash; | |
288 | tfm->exit = crypto_exit_shash_ops_async; | |
289 | ||
290 | crt->init = shash_async_init; | |
291 | crt->update = shash_async_update; | |
292 | crt->final = shash_async_final; | |
293 | crt->digest = shash_async_digest; | |
294 | crt->setkey = shash_async_setkey; | |
295 | ||
296 | crt->digestsize = alg->digestsize; | |
297 | crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash); | |
298 | ||
299 | return 0; | |
300 | } | |
301 | ||
302 | static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key, | |
303 | unsigned int keylen) | |
304 | { | |
305 | struct shash_desc **descp = crypto_hash_ctx(tfm); | |
306 | struct shash_desc *desc = *descp; | |
307 | ||
308 | return crypto_shash_setkey(desc->tfm, key, keylen); | |
309 | } | |
310 | ||
311 | static int shash_compat_init(struct hash_desc *hdesc) | |
312 | { | |
313 | struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm); | |
314 | struct shash_desc *desc = *descp; | |
315 | ||
316 | desc->flags = hdesc->flags; | |
317 | ||
318 | return crypto_shash_init(desc); | |
319 | } | |
320 | ||
321 | static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg, | |
322 | unsigned int len) | |
323 | { | |
324 | struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm); | |
325 | struct shash_desc *desc = *descp; | |
326 | struct crypto_hash_walk walk; | |
327 | int nbytes; | |
328 | ||
329 | for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len); | |
330 | nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes)) | |
331 | nbytes = crypto_shash_update(desc, walk.data, nbytes); | |
332 | ||
333 | return nbytes; | |
334 | } | |
335 | ||
336 | static int shash_compat_final(struct hash_desc *hdesc, u8 *out) | |
337 | { | |
338 | struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm); | |
339 | ||
340 | return crypto_shash_final(*descp, out); | |
341 | } | |
342 | ||
343 | static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg, | |
344 | unsigned int nbytes, u8 *out) | |
345 | { | |
346 | unsigned int offset = sg->offset; | |
347 | int err; | |
348 | ||
349 | if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) { | |
350 | struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm); | |
351 | struct shash_desc *desc = *descp; | |
352 | void *data; | |
353 | ||
354 | desc->flags = hdesc->flags; | |
355 | ||
356 | data = crypto_kmap(sg_page(sg), 0); | |
357 | err = crypto_shash_digest(desc, data + offset, nbytes, out); | |
358 | crypto_kunmap(data, 0); | |
359 | crypto_yield(desc->flags); | |
360 | goto out; | |
361 | } | |
362 | ||
363 | err = shash_compat_init(hdesc); | |
364 | if (err) | |
365 | goto out; | |
366 | ||
367 | err = shash_compat_update(hdesc, sg, nbytes); | |
368 | if (err) | |
369 | goto out; | |
370 | ||
371 | err = shash_compat_final(hdesc, out); | |
372 | ||
373 | out: | |
374 | return err; | |
375 | } | |
376 | ||
377 | static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm) | |
378 | { | |
379 | struct shash_desc **descp = crypto_tfm_ctx(tfm); | |
380 | struct shash_desc *desc = *descp; | |
381 | ||
382 | crypto_free_shash(desc->tfm); | |
383 | kzfree(desc); | |
384 | } | |
385 | ||
386 | static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm) | |
387 | { | |
388 | struct hash_tfm *crt = &tfm->crt_hash; | |
389 | struct crypto_alg *calg = tfm->__crt_alg; | |
390 | struct shash_alg *alg = __crypto_shash_alg(calg); | |
391 | struct shash_desc **descp = crypto_tfm_ctx(tfm); | |
392 | struct crypto_shash *shash; | |
393 | struct shash_desc *desc; | |
394 | ||
395 | if (!crypto_mod_get(calg)) | |
396 | return -EAGAIN; | |
397 | ||
398 | shash = crypto_create_tfm(calg, &crypto_shash_type); | |
399 | if (IS_ERR(shash)) { | |
400 | crypto_mod_put(calg); | |
401 | return PTR_ERR(shash); | |
402 | } | |
403 | ||
404 | desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(shash), | |
405 | GFP_KERNEL); | |
406 | if (!desc) { | |
407 | crypto_free_shash(shash); | |
408 | return -ENOMEM; | |
409 | } | |
410 | ||
411 | *descp = desc; | |
412 | desc->tfm = shash; | |
413 | tfm->exit = crypto_exit_shash_ops_compat; | |
414 | ||
415 | crt->init = shash_compat_init; | |
416 | crt->update = shash_compat_update; | |
417 | crt->final = shash_compat_final; | |
418 | crt->digest = shash_compat_digest; | |
419 | crt->setkey = shash_compat_setkey; | |
420 | ||
421 | crt->digestsize = alg->digestsize; | |
422 | ||
423 | return 0; | |
424 | } | |
425 | ||
426 | static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask) | |
427 | { | |
428 | switch (mask & CRYPTO_ALG_TYPE_MASK) { | |
429 | case CRYPTO_ALG_TYPE_HASH_MASK: | |
430 | return crypto_init_shash_ops_compat(tfm); | |
431 | case CRYPTO_ALG_TYPE_AHASH_MASK: | |
432 | return crypto_init_shash_ops_async(tfm); | |
433 | } | |
434 | ||
435 | return -EINVAL; | |
436 | } | |
437 | ||
438 | static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type, | |
439 | u32 mask) | |
440 | { | |
441 | switch (mask & CRYPTO_ALG_TYPE_MASK) { | |
442 | case CRYPTO_ALG_TYPE_HASH_MASK: | |
443 | return sizeof(struct shash_desc *); | |
444 | case CRYPTO_ALG_TYPE_AHASH_MASK: | |
445 | return sizeof(struct crypto_shash *); | |
446 | } | |
447 | ||
448 | return 0; | |
449 | } | |
450 | ||
451 | static int crypto_shash_init_tfm(struct crypto_tfm *tfm, | |
452 | const struct crypto_type *frontend) | |
453 | { | |
454 | struct crypto_shash *hash = __crypto_shash_cast(tfm); | |
455 | ||
456 | hash->descsize = crypto_shash_alg(hash)->descsize; | |
457 | return 0; | |
458 | } | |
459 | ||
460 | static unsigned int crypto_shash_extsize(struct crypto_alg *alg, | |
461 | const struct crypto_type *frontend) | |
462 | { | |
463 | return alg->cra_ctxsize; | |
464 | } | |
465 | ||
466 | static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg) | |
467 | __attribute__ ((unused)); | |
468 | static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg) | |
469 | { | |
470 | struct shash_alg *salg = __crypto_shash_alg(alg); | |
471 | ||
472 | seq_printf(m, "type : shash\n"); | |
473 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
474 | seq_printf(m, "digestsize : %u\n", salg->digestsize); | |
475 | } | |
476 | ||
477 | static const struct crypto_type crypto_shash_type = { | |
478 | .ctxsize = crypto_shash_ctxsize, | |
479 | .extsize = crypto_shash_extsize, | |
480 | .init = crypto_init_shash_ops, | |
481 | .init_tfm = crypto_shash_init_tfm, | |
482 | #ifdef CONFIG_PROC_FS | |
483 | .show = crypto_shash_show, | |
484 | #endif | |
485 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, | |
486 | .maskset = CRYPTO_ALG_TYPE_MASK, | |
487 | .type = CRYPTO_ALG_TYPE_SHASH, | |
488 | .tfmsize = offsetof(struct crypto_shash, base), | |
489 | }; | |
490 | ||
491 | struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type, | |
492 | u32 mask) | |
493 | { | |
494 | return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask); | |
495 | } | |
496 | EXPORT_SYMBOL_GPL(crypto_alloc_shash); | |
497 | ||
498 | static int shash_prepare_alg(struct shash_alg *alg) | |
499 | { | |
500 | struct crypto_alg *base = &alg->base; | |
501 | ||
502 | if (alg->digestsize > PAGE_SIZE / 8 || | |
503 | alg->descsize > PAGE_SIZE / 8 || | |
504 | alg->statesize > PAGE_SIZE / 8) | |
505 | return -EINVAL; | |
506 | ||
507 | base->cra_type = &crypto_shash_type; | |
508 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; | |
509 | base->cra_flags |= CRYPTO_ALG_TYPE_SHASH; | |
510 | ||
511 | if (!alg->finup) | |
512 | alg->finup = shash_finup_unaligned; | |
513 | if (!alg->digest) | |
514 | alg->digest = shash_digest_unaligned; | |
515 | if (!alg->import) | |
516 | alg->import = shash_no_import; | |
517 | if (!alg->export) | |
518 | alg->export = shash_no_export; | |
519 | if (!alg->setkey) | |
520 | alg->setkey = shash_no_setkey; | |
521 | ||
522 | return 0; | |
523 | } | |
524 | ||
525 | int crypto_register_shash(struct shash_alg *alg) | |
526 | { | |
527 | struct crypto_alg *base = &alg->base; | |
528 | int err; | |
529 | ||
530 | err = shash_prepare_alg(alg); | |
531 | if (err) | |
532 | return err; | |
533 | ||
534 | return crypto_register_alg(base); | |
535 | } | |
536 | EXPORT_SYMBOL_GPL(crypto_register_shash); | |
537 | ||
538 | int crypto_unregister_shash(struct shash_alg *alg) | |
539 | { | |
540 | return crypto_unregister_alg(&alg->base); | |
541 | } | |
542 | EXPORT_SYMBOL_GPL(crypto_unregister_shash); | |
543 | ||
544 | int shash_register_instance(struct crypto_template *tmpl, | |
545 | struct shash_instance *inst) | |
546 | { | |
547 | int err; | |
548 | ||
549 | err = shash_prepare_alg(&inst->alg); | |
550 | if (err) | |
551 | return err; | |
552 | ||
553 | return crypto_register_instance(tmpl, shash_crypto_instance(inst)); | |
554 | } | |
555 | EXPORT_SYMBOL_GPL(shash_register_instance); | |
556 | ||
557 | void shash_free_instance(struct crypto_instance *inst) | |
558 | { | |
559 | crypto_drop_spawn(crypto_instance_ctx(inst)); | |
560 | kfree(shash_instance(inst)); | |
561 | } | |
562 | EXPORT_SYMBOL_GPL(shash_free_instance); | |
563 | ||
564 | int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn, | |
565 | struct shash_alg *alg, | |
566 | struct crypto_instance *inst) | |
567 | { | |
568 | return crypto_init_spawn2(&spawn->base, &alg->base, inst, | |
569 | &crypto_shash_type); | |
570 | } | |
571 | EXPORT_SYMBOL_GPL(crypto_init_shash_spawn); | |
572 | ||
573 | struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask) | |
574 | { | |
575 | struct crypto_alg *alg; | |
576 | ||
577 | alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask); | |
578 | return IS_ERR(alg) ? ERR_CAST(alg) : | |
579 | container_of(alg, struct shash_alg, base); | |
580 | } | |
581 | EXPORT_SYMBOL_GPL(shash_attr_alg); | |
582 | ||
583 | MODULE_LICENSE("GPL"); | |
584 | MODULE_DESCRIPTION("Synchronous cryptographic hash type"); |