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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 | #include <linux/cryptouser.h> | |
21 | #include <net/netlink.h> | |
22 | #include <linux/compiler.h> | |
23 | ||
24 | #include "internal.h" | |
25 | ||
26 | static const struct crypto_type crypto_shash_type; | |
27 | ||
28 | int shash_no_setkey(struct crypto_shash *tfm, const u8 *key, | |
29 | unsigned int keylen) | |
30 | { | |
31 | return -ENOSYS; | |
32 | } | |
33 | EXPORT_SYMBOL_GPL(shash_no_setkey); | |
34 | ||
35 | static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key, | |
36 | unsigned int keylen) | |
37 | { | |
38 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
39 | unsigned long alignmask = crypto_shash_alignmask(tfm); | |
40 | unsigned long absize; | |
41 | u8 *buffer, *alignbuffer; | |
42 | int err; | |
43 | ||
44 | absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1)); | |
45 | buffer = kmalloc(absize, GFP_ATOMIC); | |
46 | if (!buffer) | |
47 | return -ENOMEM; | |
48 | ||
49 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
50 | memcpy(alignbuffer, key, keylen); | |
51 | err = shash->setkey(tfm, alignbuffer, keylen); | |
52 | kzfree(buffer); | |
53 | return err; | |
54 | } | |
55 | ||
56 | int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key, | |
57 | unsigned int keylen) | |
58 | { | |
59 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
60 | unsigned long alignmask = crypto_shash_alignmask(tfm); | |
61 | int err; | |
62 | ||
63 | if ((unsigned long)key & alignmask) | |
64 | err = shash_setkey_unaligned(tfm, key, keylen); | |
65 | else | |
66 | err = shash->setkey(tfm, key, keylen); | |
67 | ||
68 | if (err) | |
69 | return err; | |
70 | ||
71 | crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY); | |
72 | return 0; | |
73 | } | |
74 | EXPORT_SYMBOL_GPL(crypto_shash_setkey); | |
75 | ||
76 | static inline unsigned int shash_align_buffer_size(unsigned len, | |
77 | unsigned long mask) | |
78 | { | |
79 | typedef u8 __aligned_largest u8_aligned; | |
80 | return len + (mask & ~(__alignof__(u8_aligned) - 1)); | |
81 | } | |
82 | ||
83 | static int shash_update_unaligned(struct shash_desc *desc, const u8 *data, | |
84 | unsigned int len) | |
85 | { | |
86 | struct crypto_shash *tfm = desc->tfm; | |
87 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
88 | unsigned long alignmask = crypto_shash_alignmask(tfm); | |
89 | unsigned int unaligned_len = alignmask + 1 - | |
90 | ((unsigned long)data & alignmask); | |
91 | u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)] | |
92 | __aligned_largest; | |
93 | u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1); | |
94 | int err; | |
95 | ||
96 | if (unaligned_len > len) | |
97 | unaligned_len = len; | |
98 | ||
99 | memcpy(buf, data, unaligned_len); | |
100 | err = shash->update(desc, buf, unaligned_len); | |
101 | memset(buf, 0, unaligned_len); | |
102 | ||
103 | return err ?: | |
104 | shash->update(desc, data + unaligned_len, len - unaligned_len); | |
105 | } | |
106 | ||
107 | int crypto_shash_update(struct shash_desc *desc, const u8 *data, | |
108 | unsigned int len) | |
109 | { | |
110 | struct crypto_shash *tfm = desc->tfm; | |
111 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
112 | unsigned long alignmask = crypto_shash_alignmask(tfm); | |
113 | ||
114 | if ((unsigned long)data & alignmask) | |
115 | return shash_update_unaligned(desc, data, len); | |
116 | ||
117 | return shash->update(desc, data, len); | |
118 | } | |
119 | EXPORT_SYMBOL_GPL(crypto_shash_update); | |
120 | ||
121 | static int shash_final_unaligned(struct shash_desc *desc, u8 *out) | |
122 | { | |
123 | struct crypto_shash *tfm = desc->tfm; | |
124 | unsigned long alignmask = crypto_shash_alignmask(tfm); | |
125 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
126 | unsigned int ds = crypto_shash_digestsize(tfm); | |
127 | u8 ubuf[shash_align_buffer_size(ds, alignmask)] | |
128 | __aligned_largest; | |
129 | u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1); | |
130 | int err; | |
131 | ||
132 | err = shash->final(desc, buf); | |
133 | if (err) | |
134 | goto out; | |
135 | ||
136 | memcpy(out, buf, ds); | |
137 | ||
138 | out: | |
139 | memset(buf, 0, ds); | |
140 | return err; | |
141 | } | |
142 | ||
143 | int crypto_shash_final(struct shash_desc *desc, u8 *out) | |
144 | { | |
145 | struct crypto_shash *tfm = desc->tfm; | |
146 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
147 | unsigned long alignmask = crypto_shash_alignmask(tfm); | |
148 | ||
149 | if ((unsigned long)out & alignmask) | |
150 | return shash_final_unaligned(desc, out); | |
151 | ||
152 | return shash->final(desc, out); | |
153 | } | |
154 | EXPORT_SYMBOL_GPL(crypto_shash_final); | |
155 | ||
156 | static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data, | |
157 | unsigned int len, u8 *out) | |
158 | { | |
159 | return crypto_shash_update(desc, data, len) ?: | |
160 | crypto_shash_final(desc, out); | |
161 | } | |
162 | ||
163 | int crypto_shash_finup(struct shash_desc *desc, const u8 *data, | |
164 | unsigned int len, u8 *out) | |
165 | { | |
166 | struct crypto_shash *tfm = desc->tfm; | |
167 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
168 | unsigned long alignmask = crypto_shash_alignmask(tfm); | |
169 | ||
170 | if (((unsigned long)data | (unsigned long)out) & alignmask) | |
171 | return shash_finup_unaligned(desc, data, len, out); | |
172 | ||
173 | return shash->finup(desc, data, len, out); | |
174 | } | |
175 | EXPORT_SYMBOL_GPL(crypto_shash_finup); | |
176 | ||
177 | static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data, | |
178 | unsigned int len, u8 *out) | |
179 | { | |
180 | return crypto_shash_init(desc) ?: | |
181 | crypto_shash_finup(desc, data, len, out); | |
182 | } | |
183 | ||
184 | int crypto_shash_digest(struct shash_desc *desc, const u8 *data, | |
185 | unsigned int len, u8 *out) | |
186 | { | |
187 | struct crypto_shash *tfm = desc->tfm; | |
188 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
189 | unsigned long alignmask = crypto_shash_alignmask(tfm); | |
190 | ||
191 | if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) | |
192 | return -ENOKEY; | |
193 | ||
194 | if (((unsigned long)data | (unsigned long)out) & alignmask) | |
195 | return shash_digest_unaligned(desc, data, len, out); | |
196 | ||
197 | return shash->digest(desc, data, len, out); | |
198 | } | |
199 | EXPORT_SYMBOL_GPL(crypto_shash_digest); | |
200 | ||
201 | static int shash_default_export(struct shash_desc *desc, void *out) | |
202 | { | |
203 | memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm)); | |
204 | return 0; | |
205 | } | |
206 | ||
207 | static int shash_default_import(struct shash_desc *desc, const void *in) | |
208 | { | |
209 | memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm)); | |
210 | return 0; | |
211 | } | |
212 | ||
213 | static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key, | |
214 | unsigned int keylen) | |
215 | { | |
216 | struct crypto_shash **ctx = crypto_ahash_ctx(tfm); | |
217 | ||
218 | return crypto_shash_setkey(*ctx, key, keylen); | |
219 | } | |
220 | ||
221 | static int shash_async_init(struct ahash_request *req) | |
222 | { | |
223 | struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); | |
224 | struct shash_desc *desc = ahash_request_ctx(req); | |
225 | ||
226 | desc->tfm = *ctx; | |
227 | desc->flags = req->base.flags; | |
228 | ||
229 | return crypto_shash_init(desc); | |
230 | } | |
231 | ||
232 | int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc) | |
233 | { | |
234 | struct crypto_hash_walk walk; | |
235 | int nbytes; | |
236 | ||
237 | for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0; | |
238 | nbytes = crypto_hash_walk_done(&walk, nbytes)) | |
239 | nbytes = crypto_shash_update(desc, walk.data, nbytes); | |
240 | ||
241 | return nbytes; | |
242 | } | |
243 | EXPORT_SYMBOL_GPL(shash_ahash_update); | |
244 | ||
245 | static int shash_async_update(struct ahash_request *req) | |
246 | { | |
247 | return shash_ahash_update(req, ahash_request_ctx(req)); | |
248 | } | |
249 | ||
250 | static int shash_async_final(struct ahash_request *req) | |
251 | { | |
252 | return crypto_shash_final(ahash_request_ctx(req), req->result); | |
253 | } | |
254 | ||
255 | int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc) | |
256 | { | |
257 | struct crypto_hash_walk walk; | |
258 | int nbytes; | |
259 | ||
260 | nbytes = crypto_hash_walk_first(req, &walk); | |
261 | if (!nbytes) | |
262 | return crypto_shash_final(desc, req->result); | |
263 | ||
264 | do { | |
265 | nbytes = crypto_hash_walk_last(&walk) ? | |
266 | crypto_shash_finup(desc, walk.data, nbytes, | |
267 | req->result) : | |
268 | crypto_shash_update(desc, walk.data, nbytes); | |
269 | nbytes = crypto_hash_walk_done(&walk, nbytes); | |
270 | } while (nbytes > 0); | |
271 | ||
272 | return nbytes; | |
273 | } | |
274 | EXPORT_SYMBOL_GPL(shash_ahash_finup); | |
275 | ||
276 | static int shash_async_finup(struct ahash_request *req) | |
277 | { | |
278 | struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); | |
279 | struct shash_desc *desc = ahash_request_ctx(req); | |
280 | ||
281 | desc->tfm = *ctx; | |
282 | desc->flags = req->base.flags; | |
283 | ||
284 | return shash_ahash_finup(req, desc); | |
285 | } | |
286 | ||
287 | int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc) | |
288 | { | |
289 | unsigned int nbytes = req->nbytes; | |
290 | struct scatterlist *sg; | |
291 | unsigned int offset; | |
292 | int err; | |
293 | ||
294 | if (nbytes && | |
295 | (sg = req->src, offset = sg->offset, | |
296 | nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) { | |
297 | void *data; | |
298 | ||
299 | data = kmap_atomic(sg_page(sg)); | |
300 | err = crypto_shash_digest(desc, data + offset, nbytes, | |
301 | req->result); | |
302 | kunmap_atomic(data); | |
303 | crypto_yield(desc->flags); | |
304 | } else | |
305 | err = crypto_shash_init(desc) ?: | |
306 | shash_ahash_finup(req, desc); | |
307 | ||
308 | return err; | |
309 | } | |
310 | EXPORT_SYMBOL_GPL(shash_ahash_digest); | |
311 | ||
312 | static int shash_async_digest(struct ahash_request *req) | |
313 | { | |
314 | struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); | |
315 | struct shash_desc *desc = ahash_request_ctx(req); | |
316 | ||
317 | desc->tfm = *ctx; | |
318 | desc->flags = req->base.flags; | |
319 | ||
320 | return shash_ahash_digest(req, desc); | |
321 | } | |
322 | ||
323 | static int shash_async_export(struct ahash_request *req, void *out) | |
324 | { | |
325 | return crypto_shash_export(ahash_request_ctx(req), out); | |
326 | } | |
327 | ||
328 | static int shash_async_import(struct ahash_request *req, const void *in) | |
329 | { | |
330 | struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); | |
331 | struct shash_desc *desc = ahash_request_ctx(req); | |
332 | ||
333 | desc->tfm = *ctx; | |
334 | desc->flags = req->base.flags; | |
335 | ||
336 | return crypto_shash_import(desc, in); | |
337 | } | |
338 | ||
339 | static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm) | |
340 | { | |
341 | struct crypto_shash **ctx = crypto_tfm_ctx(tfm); | |
342 | ||
343 | crypto_free_shash(*ctx); | |
344 | } | |
345 | ||
346 | int crypto_init_shash_ops_async(struct crypto_tfm *tfm) | |
347 | { | |
348 | struct crypto_alg *calg = tfm->__crt_alg; | |
349 | struct shash_alg *alg = __crypto_shash_alg(calg); | |
350 | struct crypto_ahash *crt = __crypto_ahash_cast(tfm); | |
351 | struct crypto_shash **ctx = crypto_tfm_ctx(tfm); | |
352 | struct crypto_shash *shash; | |
353 | ||
354 | if (!crypto_mod_get(calg)) | |
355 | return -EAGAIN; | |
356 | ||
357 | shash = crypto_create_tfm(calg, &crypto_shash_type); | |
358 | if (IS_ERR(shash)) { | |
359 | crypto_mod_put(calg); | |
360 | return PTR_ERR(shash); | |
361 | } | |
362 | ||
363 | *ctx = shash; | |
364 | tfm->exit = crypto_exit_shash_ops_async; | |
365 | ||
366 | crt->init = shash_async_init; | |
367 | crt->update = shash_async_update; | |
368 | crt->final = shash_async_final; | |
369 | crt->finup = shash_async_finup; | |
370 | crt->digest = shash_async_digest; | |
371 | crt->setkey = shash_async_setkey; | |
372 | ||
373 | crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) & | |
374 | CRYPTO_TFM_NEED_KEY); | |
375 | ||
376 | if (alg->export) | |
377 | crt->export = shash_async_export; | |
378 | if (alg->import) | |
379 | crt->import = shash_async_import; | |
380 | ||
381 | crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash); | |
382 | ||
383 | return 0; | |
384 | } | |
385 | ||
386 | static int crypto_shash_init_tfm(struct crypto_tfm *tfm) | |
387 | { | |
388 | struct crypto_shash *hash = __crypto_shash_cast(tfm); | |
389 | struct shash_alg *alg = crypto_shash_alg(hash); | |
390 | ||
391 | hash->descsize = alg->descsize; | |
392 | ||
393 | if (crypto_shash_alg_has_setkey(alg) && | |
394 | !(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY)) | |
395 | crypto_shash_set_flags(hash, CRYPTO_TFM_NEED_KEY); | |
396 | ||
397 | return 0; | |
398 | } | |
399 | ||
400 | #ifdef CONFIG_NET | |
401 | static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg) | |
402 | { | |
403 | struct crypto_report_hash rhash; | |
404 | struct shash_alg *salg = __crypto_shash_alg(alg); | |
405 | ||
406 | strncpy(rhash.type, "shash", sizeof(rhash.type)); | |
407 | ||
408 | rhash.blocksize = alg->cra_blocksize; | |
409 | rhash.digestsize = salg->digestsize; | |
410 | ||
411 | if (nla_put(skb, CRYPTOCFGA_REPORT_HASH, | |
412 | sizeof(struct crypto_report_hash), &rhash)) | |
413 | goto nla_put_failure; | |
414 | return 0; | |
415 | ||
416 | nla_put_failure: | |
417 | return -EMSGSIZE; | |
418 | } | |
419 | #else | |
420 | static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg) | |
421 | { | |
422 | return -ENOSYS; | |
423 | } | |
424 | #endif | |
425 | ||
426 | static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg) | |
427 | __maybe_unused; | |
428 | static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg) | |
429 | { | |
430 | struct shash_alg *salg = __crypto_shash_alg(alg); | |
431 | ||
432 | seq_printf(m, "type : shash\n"); | |
433 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
434 | seq_printf(m, "digestsize : %u\n", salg->digestsize); | |
435 | } | |
436 | ||
437 | static const struct crypto_type crypto_shash_type = { | |
438 | .extsize = crypto_alg_extsize, | |
439 | .init_tfm = crypto_shash_init_tfm, | |
440 | #ifdef CONFIG_PROC_FS | |
441 | .show = crypto_shash_show, | |
442 | #endif | |
443 | .report = crypto_shash_report, | |
444 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, | |
445 | .maskset = CRYPTO_ALG_TYPE_MASK, | |
446 | .type = CRYPTO_ALG_TYPE_SHASH, | |
447 | .tfmsize = offsetof(struct crypto_shash, base), | |
448 | }; | |
449 | ||
450 | struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type, | |
451 | u32 mask) | |
452 | { | |
453 | return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask); | |
454 | } | |
455 | EXPORT_SYMBOL_GPL(crypto_alloc_shash); | |
456 | ||
457 | static int shash_prepare_alg(struct shash_alg *alg) | |
458 | { | |
459 | struct crypto_alg *base = &alg->base; | |
460 | ||
461 | if (alg->digestsize > PAGE_SIZE / 8 || | |
462 | alg->descsize > PAGE_SIZE / 8 || | |
463 | alg->statesize > PAGE_SIZE / 8) | |
464 | return -EINVAL; | |
465 | ||
466 | base->cra_type = &crypto_shash_type; | |
467 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; | |
468 | base->cra_flags |= CRYPTO_ALG_TYPE_SHASH; | |
469 | ||
470 | if (!alg->finup) | |
471 | alg->finup = shash_finup_unaligned; | |
472 | if (!alg->digest) | |
473 | alg->digest = shash_digest_unaligned; | |
474 | if (!alg->export) { | |
475 | alg->export = shash_default_export; | |
476 | alg->import = shash_default_import; | |
477 | alg->statesize = alg->descsize; | |
478 | } | |
479 | if (!alg->setkey) | |
480 | alg->setkey = shash_no_setkey; | |
481 | ||
482 | return 0; | |
483 | } | |
484 | ||
485 | int crypto_register_shash(struct shash_alg *alg) | |
486 | { | |
487 | struct crypto_alg *base = &alg->base; | |
488 | int err; | |
489 | ||
490 | err = shash_prepare_alg(alg); | |
491 | if (err) | |
492 | return err; | |
493 | ||
494 | return crypto_register_alg(base); | |
495 | } | |
496 | EXPORT_SYMBOL_GPL(crypto_register_shash); | |
497 | ||
498 | int crypto_unregister_shash(struct shash_alg *alg) | |
499 | { | |
500 | return crypto_unregister_alg(&alg->base); | |
501 | } | |
502 | EXPORT_SYMBOL_GPL(crypto_unregister_shash); | |
503 | ||
504 | int crypto_register_shashes(struct shash_alg *algs, int count) | |
505 | { | |
506 | int i, ret; | |
507 | ||
508 | for (i = 0; i < count; i++) { | |
509 | ret = crypto_register_shash(&algs[i]); | |
510 | if (ret) | |
511 | goto err; | |
512 | } | |
513 | ||
514 | return 0; | |
515 | ||
516 | err: | |
517 | for (--i; i >= 0; --i) | |
518 | crypto_unregister_shash(&algs[i]); | |
519 | ||
520 | return ret; | |
521 | } | |
522 | EXPORT_SYMBOL_GPL(crypto_register_shashes); | |
523 | ||
524 | int crypto_unregister_shashes(struct shash_alg *algs, int count) | |
525 | { | |
526 | int i, ret; | |
527 | ||
528 | for (i = count - 1; i >= 0; --i) { | |
529 | ret = crypto_unregister_shash(&algs[i]); | |
530 | if (ret) | |
531 | pr_err("Failed to unregister %s %s: %d\n", | |
532 | algs[i].base.cra_driver_name, | |
533 | algs[i].base.cra_name, ret); | |
534 | } | |
535 | ||
536 | return 0; | |
537 | } | |
538 | EXPORT_SYMBOL_GPL(crypto_unregister_shashes); | |
539 | ||
540 | int shash_register_instance(struct crypto_template *tmpl, | |
541 | struct shash_instance *inst) | |
542 | { | |
543 | int err; | |
544 | ||
545 | err = shash_prepare_alg(&inst->alg); | |
546 | if (err) | |
547 | return err; | |
548 | ||
549 | return crypto_register_instance(tmpl, shash_crypto_instance(inst)); | |
550 | } | |
551 | EXPORT_SYMBOL_GPL(shash_register_instance); | |
552 | ||
553 | void shash_free_instance(struct crypto_instance *inst) | |
554 | { | |
555 | crypto_drop_spawn(crypto_instance_ctx(inst)); | |
556 | kfree(shash_instance(inst)); | |
557 | } | |
558 | EXPORT_SYMBOL_GPL(shash_free_instance); | |
559 | ||
560 | int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn, | |
561 | struct shash_alg *alg, | |
562 | struct crypto_instance *inst) | |
563 | { | |
564 | return crypto_init_spawn2(&spawn->base, &alg->base, inst, | |
565 | &crypto_shash_type); | |
566 | } | |
567 | EXPORT_SYMBOL_GPL(crypto_init_shash_spawn); | |
568 | ||
569 | struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask) | |
570 | { | |
571 | struct crypto_alg *alg; | |
572 | ||
573 | alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask); | |
574 | return IS_ERR(alg) ? ERR_CAST(alg) : | |
575 | container_of(alg, struct shash_alg, base); | |
576 | } | |
577 | EXPORT_SYMBOL_GPL(shash_attr_alg); | |
578 | ||
579 | MODULE_LICENSE("GPL"); | |
580 | MODULE_DESCRIPTION("Synchronous cryptographic hash type"); |