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Commit | Line | Data |
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7b5a080b HX |
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 | ||
3b2f6df0 | 13 | #include <crypto/scatterwalk.h> |
7b5a080b HX |
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 | ||
3b2f6df0 HX |
21 | #include "internal.h" |
22 | ||
3f683d61 HX |
23 | static const struct crypto_type crypto_shash_type; |
24 | ||
7b5a080b HX |
25 | static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key, |
26 | unsigned int keylen) | |
27 | { | |
28 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
29 | unsigned long alignmask = crypto_shash_alignmask(tfm); | |
30 | unsigned long absize; | |
31 | u8 *buffer, *alignbuffer; | |
32 | int err; | |
33 | ||
34 | absize = keylen + (alignmask & ~(CRYPTO_MINALIGN - 1)); | |
35 | buffer = kmalloc(absize, GFP_KERNEL); | |
36 | if (!buffer) | |
37 | return -ENOMEM; | |
38 | ||
39 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
40 | memcpy(alignbuffer, key, keylen); | |
41 | err = shash->setkey(tfm, alignbuffer, keylen); | |
42 | memset(alignbuffer, 0, keylen); | |
43 | kfree(buffer); | |
44 | return err; | |
45 | } | |
46 | ||
47 | int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key, | |
48 | unsigned int keylen) | |
49 | { | |
50 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
51 | unsigned long alignmask = crypto_shash_alignmask(tfm); | |
52 | ||
3751f402 HX |
53 | if (!shash->setkey) |
54 | return -ENOSYS; | |
55 | ||
7b5a080b HX |
56 | if ((unsigned long)key & alignmask) |
57 | return shash_setkey_unaligned(tfm, key, keylen); | |
58 | ||
59 | return shash->setkey(tfm, key, keylen); | |
60 | } | |
61 | EXPORT_SYMBOL_GPL(crypto_shash_setkey); | |
62 | ||
63 | static inline unsigned int shash_align_buffer_size(unsigned len, | |
64 | unsigned long mask) | |
65 | { | |
66 | return len + (mask & ~(__alignof__(u8 __attribute__ ((aligned))) - 1)); | |
67 | } | |
68 | ||
69 | static int shash_update_unaligned(struct shash_desc *desc, const u8 *data, | |
70 | unsigned int len) | |
71 | { | |
72 | struct crypto_shash *tfm = desc->tfm; | |
73 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
74 | unsigned long alignmask = crypto_shash_alignmask(tfm); | |
75 | unsigned int unaligned_len = alignmask + 1 - | |
76 | ((unsigned long)data & alignmask); | |
77 | u8 buf[shash_align_buffer_size(unaligned_len, alignmask)] | |
78 | __attribute__ ((aligned)); | |
79 | ||
f4f68993 YS |
80 | if (unaligned_len > len) |
81 | unaligned_len = len; | |
82 | ||
7b5a080b HX |
83 | memcpy(buf, data, unaligned_len); |
84 | ||
85 | return shash->update(desc, buf, unaligned_len) ?: | |
86 | shash->update(desc, data + unaligned_len, len - unaligned_len); | |
87 | } | |
88 | ||
89 | int crypto_shash_update(struct shash_desc *desc, const u8 *data, | |
90 | unsigned int len) | |
91 | { | |
92 | struct crypto_shash *tfm = desc->tfm; | |
93 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
94 | unsigned long alignmask = crypto_shash_alignmask(tfm); | |
95 | ||
96 | if ((unsigned long)data & alignmask) | |
97 | return shash_update_unaligned(desc, data, len); | |
98 | ||
99 | return shash->update(desc, data, len); | |
100 | } | |
101 | EXPORT_SYMBOL_GPL(crypto_shash_update); | |
102 | ||
103 | static int shash_final_unaligned(struct shash_desc *desc, u8 *out) | |
104 | { | |
105 | struct crypto_shash *tfm = desc->tfm; | |
106 | unsigned long alignmask = crypto_shash_alignmask(tfm); | |
107 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
108 | unsigned int ds = crypto_shash_digestsize(tfm); | |
109 | u8 buf[shash_align_buffer_size(ds, alignmask)] | |
110 | __attribute__ ((aligned)); | |
111 | int err; | |
112 | ||
113 | err = shash->final(desc, buf); | |
114 | memcpy(out, buf, ds); | |
115 | return err; | |
116 | } | |
117 | ||
118 | int crypto_shash_final(struct shash_desc *desc, u8 *out) | |
119 | { | |
120 | struct crypto_shash *tfm = desc->tfm; | |
121 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
122 | unsigned long alignmask = crypto_shash_alignmask(tfm); | |
123 | ||
124 | if ((unsigned long)out & alignmask) | |
125 | return shash_final_unaligned(desc, out); | |
126 | ||
127 | return shash->final(desc, out); | |
128 | } | |
129 | EXPORT_SYMBOL_GPL(crypto_shash_final); | |
130 | ||
131 | static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data, | |
132 | unsigned int len, u8 *out) | |
133 | { | |
134 | return crypto_shash_update(desc, data, len) ?: | |
135 | crypto_shash_final(desc, out); | |
136 | } | |
137 | ||
138 | int crypto_shash_finup(struct shash_desc *desc, const u8 *data, | |
139 | unsigned int len, u8 *out) | |
140 | { | |
141 | struct crypto_shash *tfm = desc->tfm; | |
142 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
143 | unsigned long alignmask = crypto_shash_alignmask(tfm); | |
144 | ||
145 | if (((unsigned long)data | (unsigned long)out) & alignmask || | |
146 | !shash->finup) | |
147 | return shash_finup_unaligned(desc, data, len, out); | |
148 | ||
149 | return shash->finup(desc, data, len, out); | |
150 | } | |
151 | EXPORT_SYMBOL_GPL(crypto_shash_finup); | |
152 | ||
153 | static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data, | |
154 | unsigned int len, u8 *out) | |
155 | { | |
156 | return crypto_shash_init(desc) ?: | |
f88ad8de | 157 | crypto_shash_finup(desc, data, len, out); |
7b5a080b HX |
158 | } |
159 | ||
160 | int crypto_shash_digest(struct shash_desc *desc, const u8 *data, | |
161 | unsigned int len, u8 *out) | |
162 | { | |
163 | struct crypto_shash *tfm = desc->tfm; | |
164 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
165 | unsigned long alignmask = crypto_shash_alignmask(tfm); | |
166 | ||
167 | if (((unsigned long)data | (unsigned long)out) & alignmask || | |
168 | !shash->digest) | |
169 | return shash_digest_unaligned(desc, data, len, out); | |
170 | ||
171 | return shash->digest(desc, data, len, out); | |
172 | } | |
173 | EXPORT_SYMBOL_GPL(crypto_shash_digest); | |
174 | ||
dec8b786 HX |
175 | int crypto_shash_import(struct shash_desc *desc, const u8 *in) |
176 | { | |
177 | struct crypto_shash *tfm = desc->tfm; | |
178 | struct shash_alg *alg = crypto_shash_alg(tfm); | |
179 | ||
180 | memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(tfm)); | |
181 | ||
182 | if (alg->reinit) | |
deee2289 | 183 | return alg->reinit(desc); |
dec8b786 HX |
184 | |
185 | return 0; | |
186 | } | |
187 | EXPORT_SYMBOL_GPL(crypto_shash_import); | |
188 | ||
3b2f6df0 HX |
189 | static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key, |
190 | unsigned int keylen) | |
191 | { | |
192 | struct crypto_shash **ctx = crypto_ahash_ctx(tfm); | |
193 | ||
194 | return crypto_shash_setkey(*ctx, key, keylen); | |
195 | } | |
196 | ||
197 | static int shash_async_init(struct ahash_request *req) | |
198 | { | |
199 | struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); | |
200 | struct shash_desc *desc = ahash_request_ctx(req); | |
201 | ||
202 | desc->tfm = *ctx; | |
203 | desc->flags = req->base.flags; | |
204 | ||
205 | return crypto_shash_init(desc); | |
206 | } | |
207 | ||
208 | static int shash_async_update(struct ahash_request *req) | |
209 | { | |
210 | struct shash_desc *desc = ahash_request_ctx(req); | |
211 | struct crypto_hash_walk walk; | |
212 | int nbytes; | |
213 | ||
214 | for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0; | |
215 | nbytes = crypto_hash_walk_done(&walk, nbytes)) | |
216 | nbytes = crypto_shash_update(desc, walk.data, nbytes); | |
217 | ||
218 | return nbytes; | |
219 | } | |
220 | ||
221 | static int shash_async_final(struct ahash_request *req) | |
222 | { | |
223 | return crypto_shash_final(ahash_request_ctx(req), req->result); | |
224 | } | |
225 | ||
226 | static int shash_async_digest(struct ahash_request *req) | |
227 | { | |
228 | struct scatterlist *sg = req->src; | |
229 | unsigned int offset = sg->offset; | |
230 | unsigned int nbytes = req->nbytes; | |
231 | int err; | |
232 | ||
233 | if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) { | |
234 | struct crypto_shash **ctx = | |
235 | crypto_ahash_ctx(crypto_ahash_reqtfm(req)); | |
236 | struct shash_desc *desc = ahash_request_ctx(req); | |
237 | void *data; | |
238 | ||
239 | desc->tfm = *ctx; | |
240 | desc->flags = req->base.flags; | |
241 | ||
242 | data = crypto_kmap(sg_page(sg), 0); | |
243 | err = crypto_shash_digest(desc, data + offset, nbytes, | |
244 | req->result); | |
245 | crypto_kunmap(data, 0); | |
246 | crypto_yield(desc->flags); | |
247 | goto out; | |
248 | } | |
249 | ||
250 | err = shash_async_init(req); | |
251 | if (err) | |
252 | goto out; | |
253 | ||
254 | err = shash_async_update(req); | |
255 | if (err) | |
256 | goto out; | |
257 | ||
258 | err = shash_async_final(req); | |
259 | ||
260 | out: | |
261 | return err; | |
262 | } | |
263 | ||
264 | static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm) | |
265 | { | |
266 | struct crypto_shash **ctx = crypto_tfm_ctx(tfm); | |
267 | ||
268 | crypto_free_shash(*ctx); | |
269 | } | |
270 | ||
271 | static int crypto_init_shash_ops_async(struct crypto_tfm *tfm) | |
272 | { | |
273 | struct crypto_alg *calg = tfm->__crt_alg; | |
274 | struct shash_alg *alg = __crypto_shash_alg(calg); | |
275 | struct ahash_tfm *crt = &tfm->crt_ahash; | |
276 | struct crypto_shash **ctx = crypto_tfm_ctx(tfm); | |
277 | struct crypto_shash *shash; | |
278 | ||
279 | if (!crypto_mod_get(calg)) | |
280 | return -EAGAIN; | |
281 | ||
3f683d61 | 282 | shash = crypto_create_tfm(calg, &crypto_shash_type); |
3b2f6df0 HX |
283 | if (IS_ERR(shash)) { |
284 | crypto_mod_put(calg); | |
285 | return PTR_ERR(shash); | |
286 | } | |
287 | ||
288 | *ctx = shash; | |
289 | tfm->exit = crypto_exit_shash_ops_async; | |
290 | ||
291 | crt->init = shash_async_init; | |
292 | crt->update = shash_async_update; | |
293 | crt->final = shash_async_final; | |
294 | crt->digest = shash_async_digest; | |
295 | crt->setkey = shash_async_setkey; | |
296 | ||
297 | crt->digestsize = alg->digestsize; | |
298 | crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash); | |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
5f7082ed HX |
303 | static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key, |
304 | unsigned int keylen) | |
305 | { | |
306 | struct shash_desc *desc = crypto_hash_ctx(tfm); | |
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 *desc = crypto_hash_ctx(hdesc->tfm); | |
314 | ||
315 | desc->flags = hdesc->flags; | |
316 | ||
317 | return crypto_shash_init(desc); | |
318 | } | |
319 | ||
320 | static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg, | |
321 | unsigned int len) | |
322 | { | |
323 | struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm); | |
324 | struct crypto_hash_walk walk; | |
325 | int nbytes; | |
326 | ||
327 | for (nbytes = crypto_hash_walk_first_compat(hdesc, &walk, sg, len); | |
328 | nbytes > 0; nbytes = crypto_hash_walk_done(&walk, nbytes)) | |
329 | nbytes = crypto_shash_update(desc, walk.data, nbytes); | |
330 | ||
331 | return nbytes; | |
332 | } | |
333 | ||
334 | static int shash_compat_final(struct hash_desc *hdesc, u8 *out) | |
335 | { | |
336 | return crypto_shash_final(crypto_hash_ctx(hdesc->tfm), out); | |
337 | } | |
338 | ||
339 | static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg, | |
340 | unsigned int nbytes, u8 *out) | |
341 | { | |
342 | unsigned int offset = sg->offset; | |
343 | int err; | |
344 | ||
345 | if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) { | |
346 | struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm); | |
347 | void *data; | |
348 | ||
349 | desc->flags = hdesc->flags; | |
350 | ||
351 | data = crypto_kmap(sg_page(sg), 0); | |
352 | err = crypto_shash_digest(desc, data + offset, nbytes, out); | |
353 | crypto_kunmap(data, 0); | |
354 | crypto_yield(desc->flags); | |
355 | goto out; | |
356 | } | |
357 | ||
358 | err = shash_compat_init(hdesc); | |
359 | if (err) | |
360 | goto out; | |
361 | ||
362 | err = shash_compat_update(hdesc, sg, nbytes); | |
363 | if (err) | |
364 | goto out; | |
365 | ||
366 | err = shash_compat_final(hdesc, out); | |
367 | ||
368 | out: | |
369 | return err; | |
370 | } | |
371 | ||
372 | static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm) | |
373 | { | |
374 | struct shash_desc *desc= crypto_tfm_ctx(tfm); | |
375 | ||
376 | crypto_free_shash(desc->tfm); | |
377 | } | |
378 | ||
379 | static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm) | |
380 | { | |
381 | struct hash_tfm *crt = &tfm->crt_hash; | |
382 | struct crypto_alg *calg = tfm->__crt_alg; | |
383 | struct shash_alg *alg = __crypto_shash_alg(calg); | |
384 | struct shash_desc *desc = crypto_tfm_ctx(tfm); | |
385 | struct crypto_shash *shash; | |
386 | ||
4abfd73e AKR |
387 | if (!crypto_mod_get(calg)) |
388 | return -EAGAIN; | |
389 | ||
3f683d61 | 390 | shash = crypto_create_tfm(calg, &crypto_shash_type); |
4abfd73e AKR |
391 | if (IS_ERR(shash)) { |
392 | crypto_mod_put(calg); | |
5f7082ed | 393 | return PTR_ERR(shash); |
4abfd73e | 394 | } |
5f7082ed HX |
395 | |
396 | desc->tfm = shash; | |
397 | tfm->exit = crypto_exit_shash_ops_compat; | |
398 | ||
399 | crt->init = shash_compat_init; | |
400 | crt->update = shash_compat_update; | |
401 | crt->final = shash_compat_final; | |
402 | crt->digest = shash_compat_digest; | |
403 | crt->setkey = shash_compat_setkey; | |
404 | ||
405 | crt->digestsize = alg->digestsize; | |
406 | ||
407 | return 0; | |
408 | } | |
409 | ||
3b2f6df0 HX |
410 | static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask) |
411 | { | |
412 | switch (mask & CRYPTO_ALG_TYPE_MASK) { | |
5f7082ed HX |
413 | case CRYPTO_ALG_TYPE_HASH_MASK: |
414 | return crypto_init_shash_ops_compat(tfm); | |
3b2f6df0 HX |
415 | case CRYPTO_ALG_TYPE_AHASH_MASK: |
416 | return crypto_init_shash_ops_async(tfm); | |
417 | } | |
418 | ||
419 | return -EINVAL; | |
420 | } | |
421 | ||
422 | static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type, | |
423 | u32 mask) | |
424 | { | |
5f7082ed HX |
425 | struct shash_alg *salg = __crypto_shash_alg(alg); |
426 | ||
3b2f6df0 | 427 | switch (mask & CRYPTO_ALG_TYPE_MASK) { |
5f7082ed HX |
428 | case CRYPTO_ALG_TYPE_HASH_MASK: |
429 | return sizeof(struct shash_desc) + salg->descsize; | |
3b2f6df0 HX |
430 | case CRYPTO_ALG_TYPE_AHASH_MASK: |
431 | return sizeof(struct crypto_shash *); | |
432 | } | |
433 | ||
434 | return 0; | |
435 | } | |
436 | ||
7b5a080b HX |
437 | static int crypto_shash_init_tfm(struct crypto_tfm *tfm, |
438 | const struct crypto_type *frontend) | |
439 | { | |
7b5a080b HX |
440 | return 0; |
441 | } | |
442 | ||
443 | static unsigned int crypto_shash_extsize(struct crypto_alg *alg, | |
444 | const struct crypto_type *frontend) | |
445 | { | |
446 | return alg->cra_ctxsize; | |
447 | } | |
448 | ||
449 | static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg) | |
450 | __attribute__ ((unused)); | |
451 | static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg) | |
452 | { | |
453 | struct shash_alg *salg = __crypto_shash_alg(alg); | |
454 | ||
455 | seq_printf(m, "type : shash\n"); | |
456 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
457 | seq_printf(m, "digestsize : %u\n", salg->digestsize); | |
458 | seq_printf(m, "descsize : %u\n", salg->descsize); | |
459 | } | |
460 | ||
461 | static const struct crypto_type crypto_shash_type = { | |
3b2f6df0 | 462 | .ctxsize = crypto_shash_ctxsize, |
7b5a080b | 463 | .extsize = crypto_shash_extsize, |
3b2f6df0 | 464 | .init = crypto_init_shash_ops, |
7b5a080b HX |
465 | .init_tfm = crypto_shash_init_tfm, |
466 | #ifdef CONFIG_PROC_FS | |
467 | .show = crypto_shash_show, | |
468 | #endif | |
469 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, | |
470 | .maskset = CRYPTO_ALG_TYPE_MASK, | |
471 | .type = CRYPTO_ALG_TYPE_SHASH, | |
472 | .tfmsize = offsetof(struct crypto_shash, base), | |
473 | }; | |
474 | ||
475 | struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type, | |
476 | u32 mask) | |
477 | { | |
3f683d61 | 478 | return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask); |
7b5a080b HX |
479 | } |
480 | EXPORT_SYMBOL_GPL(crypto_alloc_shash); | |
481 | ||
619a6ebd | 482 | static int shash_prepare_alg(struct shash_alg *alg) |
7b5a080b HX |
483 | { |
484 | struct crypto_alg *base = &alg->base; | |
485 | ||
486 | if (alg->digestsize > PAGE_SIZE / 8 || | |
487 | alg->descsize > PAGE_SIZE / 8) | |
488 | return -EINVAL; | |
489 | ||
490 | base->cra_type = &crypto_shash_type; | |
491 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; | |
492 | base->cra_flags |= CRYPTO_ALG_TYPE_SHASH; | |
619a6ebd HX |
493 | return 0; |
494 | } | |
495 | ||
496 | int crypto_register_shash(struct shash_alg *alg) | |
497 | { | |
498 | struct crypto_alg *base = &alg->base; | |
499 | int err; | |
500 | ||
501 | err = shash_prepare_alg(alg); | |
502 | if (err) | |
503 | return err; | |
7b5a080b HX |
504 | |
505 | return crypto_register_alg(base); | |
506 | } | |
507 | EXPORT_SYMBOL_GPL(crypto_register_shash); | |
508 | ||
509 | int crypto_unregister_shash(struct shash_alg *alg) | |
510 | { | |
511 | return crypto_unregister_alg(&alg->base); | |
512 | } | |
513 | EXPORT_SYMBOL_GPL(crypto_unregister_shash); | |
514 | ||
619a6ebd HX |
515 | int shash_register_instance(struct crypto_template *tmpl, |
516 | struct shash_instance *inst) | |
517 | { | |
518 | int err; | |
519 | ||
520 | err = shash_prepare_alg(&inst->alg); | |
521 | if (err) | |
522 | return err; | |
523 | ||
524 | return crypto_register_instance(tmpl, shash_crypto_instance(inst)); | |
525 | } | |
526 | EXPORT_SYMBOL_GPL(shash_register_instance); | |
527 | ||
2e4fddd8 HX |
528 | void shash_free_instance(struct crypto_instance *inst) |
529 | { | |
530 | crypto_drop_spawn(crypto_instance_ctx(inst)); | |
531 | kfree(shash_instance(inst)); | |
532 | } | |
533 | EXPORT_SYMBOL_GPL(shash_free_instance); | |
534 | ||
94296999 HX |
535 | int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn, |
536 | struct shash_alg *alg, | |
537 | struct crypto_instance *inst) | |
538 | { | |
539 | return crypto_init_spawn2(&spawn->base, &alg->base, inst, | |
540 | &crypto_shash_type); | |
541 | } | |
542 | EXPORT_SYMBOL_GPL(crypto_init_shash_spawn); | |
543 | ||
7d6f5640 HX |
544 | struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask) |
545 | { | |
546 | struct crypto_alg *alg; | |
547 | ||
548 | alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask); | |
549 | return IS_ERR(alg) ? ERR_CAST(alg) : | |
550 | container_of(alg, struct shash_alg, base); | |
551 | } | |
552 | EXPORT_SYMBOL_GPL(shash_attr_alg); | |
553 | ||
7b5a080b HX |
554 | MODULE_LICENSE("GPL"); |
555 | MODULE_DESCRIPTION("Synchronous cryptographic hash type"); |