Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
7b5a080b HX |
2 | /* |
3 | * Synchronous Cryptographic Hash operations. | |
4 | * | |
5 | * Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au> | |
7b5a080b HX |
6 | */ |
7 | ||
3b2f6df0 | 8 | #include <crypto/scatterwalk.h> |
42808e5d | 9 | #include <linux/cryptouser.h> |
7b5a080b HX |
10 | #include <linux/err.h> |
11 | #include <linux/kernel.h> | |
12 | #include <linux/module.h> | |
7b5a080b | 13 | #include <linux/seq_file.h> |
42808e5d | 14 | #include <linux/string.h> |
f4d663ce | 15 | #include <net/netlink.h> |
7b5a080b | 16 | |
42808e5d | 17 | #include "hash.h" |
3b2f6df0 | 18 | |
3f683d61 HX |
19 | static const struct crypto_type crypto_shash_type; |
20 | ||
42808e5d HX |
21 | static inline struct crypto_istat_hash *shash_get_stat(struct shash_alg *alg) |
22 | { | |
23 | return hash_get_stat(&alg->halg); | |
24 | } | |
25 | ||
26 | static inline int crypto_shash_errstat(struct shash_alg *alg, int err) | |
27 | { | |
28 | return crypto_hash_errstat(&alg->halg, err); | |
29 | } | |
30 | ||
c060e16d EB |
31 | int shash_no_setkey(struct crypto_shash *tfm, const u8 *key, |
32 | unsigned int keylen) | |
57cfe44b HX |
33 | { |
34 | return -ENOSYS; | |
35 | } | |
c060e16d | 36 | EXPORT_SYMBOL_GPL(shash_no_setkey); |
57cfe44b | 37 | |
ba7d7433 EB |
38 | static void shash_set_needkey(struct crypto_shash *tfm, struct shash_alg *alg) |
39 | { | |
c2881789 | 40 | if (crypto_shash_alg_needs_key(alg)) |
ba7d7433 EB |
41 | crypto_shash_set_flags(tfm, CRYPTO_TFM_NEED_KEY); |
42 | } | |
43 | ||
7b5a080b HX |
44 | int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key, |
45 | unsigned int keylen) | |
46 | { | |
47 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
9fa68f62 | 48 | int err; |
7b5a080b | 49 | |
345bfa3c | 50 | err = shash->setkey(tfm, key, keylen); |
ba7d7433 EB |
51 | if (unlikely(err)) { |
52 | shash_set_needkey(tfm, shash); | |
9fa68f62 | 53 | return err; |
ba7d7433 | 54 | } |
7b5a080b | 55 | |
9fa68f62 EB |
56 | crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY); |
57 | return 0; | |
7b5a080b HX |
58 | } |
59 | EXPORT_SYMBOL_GPL(crypto_shash_setkey); | |
60 | ||
7b5a080b HX |
61 | int crypto_shash_update(struct shash_desc *desc, const u8 *data, |
62 | unsigned int len) | |
63 | { | |
345bfa3c | 64 | struct shash_alg *shash = crypto_shash_alg(desc->tfm); |
42808e5d HX |
65 | int err; |
66 | ||
67 | if (IS_ENABLED(CONFIG_CRYPTO_STATS)) | |
68 | atomic64_add(len, &shash_get_stat(shash)->hash_tlen); | |
7b5a080b | 69 | |
345bfa3c | 70 | err = shash->update(desc, data, len); |
7b5a080b | 71 | |
42808e5d | 72 | return crypto_shash_errstat(shash, err); |
7b5a080b HX |
73 | } |
74 | EXPORT_SYMBOL_GPL(crypto_shash_update); | |
75 | ||
7b5a080b HX |
76 | int crypto_shash_final(struct shash_desc *desc, u8 *out) |
77 | { | |
345bfa3c | 78 | struct shash_alg *shash = crypto_shash_alg(desc->tfm); |
42808e5d HX |
79 | int err; |
80 | ||
81 | if (IS_ENABLED(CONFIG_CRYPTO_STATS)) | |
82 | atomic64_inc(&shash_get_stat(shash)->hash_cnt); | |
7b5a080b | 83 | |
345bfa3c | 84 | err = shash->final(desc, out); |
7b5a080b | 85 | |
42808e5d | 86 | return crypto_shash_errstat(shash, err); |
7b5a080b HX |
87 | } |
88 | EXPORT_SYMBOL_GPL(crypto_shash_final); | |
89 | ||
313a4074 EB |
90 | static int shash_default_finup(struct shash_desc *desc, const u8 *data, |
91 | unsigned int len, u8 *out) | |
92 | { | |
93 | struct shash_alg *shash = crypto_shash_alg(desc->tfm); | |
94 | ||
95 | return shash->update(desc, data, len) ?: | |
96 | shash->final(desc, out); | |
97 | } | |
98 | ||
7b5a080b HX |
99 | int crypto_shash_finup(struct shash_desc *desc, const u8 *data, |
100 | unsigned int len, u8 *out) | |
101 | { | |
102 | struct crypto_shash *tfm = desc->tfm; | |
103 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
42808e5d HX |
104 | int err; |
105 | ||
106 | if (IS_ENABLED(CONFIG_CRYPTO_STATS)) { | |
107 | struct crypto_istat_hash *istat = shash_get_stat(shash); | |
108 | ||
109 | atomic64_inc(&istat->hash_cnt); | |
110 | atomic64_add(len, &istat->hash_tlen); | |
111 | } | |
7b5a080b | 112 | |
345bfa3c | 113 | err = shash->finup(desc, data, len, out); |
7b5a080b | 114 | |
42808e5d | 115 | return crypto_shash_errstat(shash, err); |
7b5a080b HX |
116 | } |
117 | EXPORT_SYMBOL_GPL(crypto_shash_finup); | |
118 | ||
313a4074 EB |
119 | static int shash_default_digest(struct shash_desc *desc, const u8 *data, |
120 | unsigned int len, u8 *out) | |
121 | { | |
122 | struct shash_alg *shash = crypto_shash_alg(desc->tfm); | |
123 | ||
124 | return shash->init(desc) ?: | |
125 | shash->finup(desc, data, len, out); | |
126 | } | |
127 | ||
7b5a080b HX |
128 | int crypto_shash_digest(struct shash_desc *desc, const u8 *data, |
129 | unsigned int len, u8 *out) | |
130 | { | |
131 | struct crypto_shash *tfm = desc->tfm; | |
132 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
42808e5d | 133 | int err; |
7b5a080b | 134 | |
42808e5d HX |
135 | if (IS_ENABLED(CONFIG_CRYPTO_STATS)) { |
136 | struct crypto_istat_hash *istat = shash_get_stat(shash); | |
9fa68f62 | 137 | |
42808e5d HX |
138 | atomic64_inc(&istat->hash_cnt); |
139 | atomic64_add(len, &istat->hash_tlen); | |
140 | } | |
7b5a080b | 141 | |
42808e5d HX |
142 | if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) |
143 | err = -ENOKEY; | |
42808e5d HX |
144 | else |
145 | err = shash->digest(desc, data, len, out); | |
146 | ||
147 | return crypto_shash_errstat(shash, err); | |
7b5a080b HX |
148 | } |
149 | EXPORT_SYMBOL_GPL(crypto_shash_digest); | |
150 | ||
822a98b8 EB |
151 | int crypto_shash_tfm_digest(struct crypto_shash *tfm, const u8 *data, |
152 | unsigned int len, u8 *out) | |
153 | { | |
154 | SHASH_DESC_ON_STACK(desc, tfm); | |
155 | int err; | |
156 | ||
157 | desc->tfm = tfm; | |
158 | ||
159 | err = crypto_shash_digest(desc, data, len, out); | |
160 | ||
161 | shash_desc_zero(desc); | |
162 | ||
163 | return err; | |
164 | } | |
165 | EXPORT_SYMBOL_GPL(crypto_shash_tfm_digest); | |
166 | ||
08debaa5 | 167 | int crypto_shash_export(struct shash_desc *desc, void *out) |
dec8b786 | 168 | { |
08debaa5 EB |
169 | struct crypto_shash *tfm = desc->tfm; |
170 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
171 | ||
172 | if (shash->export) | |
173 | return shash->export(desc, out); | |
174 | ||
175 | memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(tfm)); | |
f592682f | 176 | return 0; |
99d27e1c | 177 | } |
08debaa5 | 178 | EXPORT_SYMBOL_GPL(crypto_shash_export); |
dec8b786 | 179 | |
08debaa5 | 180 | int crypto_shash_import(struct shash_desc *desc, const void *in) |
99d27e1c | 181 | { |
08debaa5 EB |
182 | struct crypto_shash *tfm = desc->tfm; |
183 | struct shash_alg *shash = crypto_shash_alg(tfm); | |
184 | ||
185 | if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) | |
186 | return -ENOKEY; | |
187 | ||
188 | if (shash->import) | |
189 | return shash->import(desc, in); | |
190 | ||
191 | memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(tfm)); | |
f592682f | 192 | return 0; |
dec8b786 | 193 | } |
08debaa5 | 194 | EXPORT_SYMBOL_GPL(crypto_shash_import); |
dec8b786 | 195 | |
3b2f6df0 HX |
196 | static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key, |
197 | unsigned int keylen) | |
198 | { | |
199 | struct crypto_shash **ctx = crypto_ahash_ctx(tfm); | |
200 | ||
201 | return crypto_shash_setkey(*ctx, key, keylen); | |
202 | } | |
203 | ||
204 | static int shash_async_init(struct ahash_request *req) | |
205 | { | |
206 | struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); | |
207 | struct shash_desc *desc = ahash_request_ctx(req); | |
208 | ||
209 | desc->tfm = *ctx; | |
3b2f6df0 HX |
210 | |
211 | return crypto_shash_init(desc); | |
212 | } | |
213 | ||
7eddf95e | 214 | int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc) |
3b2f6df0 | 215 | { |
3b2f6df0 HX |
216 | struct crypto_hash_walk walk; |
217 | int nbytes; | |
218 | ||
219 | for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0; | |
220 | nbytes = crypto_hash_walk_done(&walk, nbytes)) | |
221 | nbytes = crypto_shash_update(desc, walk.data, nbytes); | |
222 | ||
223 | return nbytes; | |
224 | } | |
7eddf95e HX |
225 | EXPORT_SYMBOL_GPL(shash_ahash_update); |
226 | ||
227 | static int shash_async_update(struct ahash_request *req) | |
228 | { | |
229 | return shash_ahash_update(req, ahash_request_ctx(req)); | |
230 | } | |
3b2f6df0 HX |
231 | |
232 | static int shash_async_final(struct ahash_request *req) | |
233 | { | |
234 | return crypto_shash_final(ahash_request_ctx(req), req->result); | |
235 | } | |
236 | ||
66f6ce5e HX |
237 | int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc) |
238 | { | |
239 | struct crypto_hash_walk walk; | |
240 | int nbytes; | |
241 | ||
cbc86b91 HX |
242 | nbytes = crypto_hash_walk_first(req, &walk); |
243 | if (!nbytes) | |
244 | return crypto_shash_final(desc, req->result); | |
245 | ||
246 | do { | |
66f6ce5e HX |
247 | nbytes = crypto_hash_walk_last(&walk) ? |
248 | crypto_shash_finup(desc, walk.data, nbytes, | |
249 | req->result) : | |
250 | crypto_shash_update(desc, walk.data, nbytes); | |
cbc86b91 HX |
251 | nbytes = crypto_hash_walk_done(&walk, nbytes); |
252 | } while (nbytes > 0); | |
66f6ce5e HX |
253 | |
254 | return nbytes; | |
255 | } | |
256 | EXPORT_SYMBOL_GPL(shash_ahash_finup); | |
257 | ||
258 | static int shash_async_finup(struct ahash_request *req) | |
259 | { | |
260 | struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); | |
261 | struct shash_desc *desc = ahash_request_ctx(req); | |
262 | ||
263 | desc->tfm = *ctx; | |
66f6ce5e HX |
264 | |
265 | return shash_ahash_finup(req, desc); | |
266 | } | |
267 | ||
7eddf95e | 268 | int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc) |
3b2f6df0 | 269 | { |
3b2f6df0 | 270 | unsigned int nbytes = req->nbytes; |
b61907bb HX |
271 | struct scatterlist *sg; |
272 | unsigned int offset; | |
3b2f6df0 HX |
273 | int err; |
274 | ||
b61907bb HX |
275 | if (nbytes && |
276 | (sg = req->src, offset = sg->offset, | |
67cb60e4 | 277 | nbytes <= min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) { |
3b2f6df0 HX |
278 | void *data; |
279 | ||
aa969515 | 280 | data = kmap_local_page(sg_page(sg)); |
3b2f6df0 HX |
281 | err = crypto_shash_digest(desc, data + offset, nbytes, |
282 | req->result); | |
aa969515 | 283 | kunmap_local(data); |
7eddf95e HX |
284 | } else |
285 | err = crypto_shash_init(desc) ?: | |
66f6ce5e | 286 | shash_ahash_finup(req, desc); |
3b2f6df0 | 287 | |
7eddf95e HX |
288 | return err; |
289 | } | |
290 | EXPORT_SYMBOL_GPL(shash_ahash_digest); | |
3b2f6df0 | 291 | |
7eddf95e HX |
292 | static int shash_async_digest(struct ahash_request *req) |
293 | { | |
294 | struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); | |
295 | struct shash_desc *desc = ahash_request_ctx(req); | |
3b2f6df0 | 296 | |
7eddf95e | 297 | desc->tfm = *ctx; |
3b2f6df0 | 298 | |
7eddf95e | 299 | return shash_ahash_digest(req, desc); |
3b2f6df0 HX |
300 | } |
301 | ||
66f6ce5e HX |
302 | static int shash_async_export(struct ahash_request *req, void *out) |
303 | { | |
304 | return crypto_shash_export(ahash_request_ctx(req), out); | |
305 | } | |
306 | ||
307 | static int shash_async_import(struct ahash_request *req, const void *in) | |
308 | { | |
90246e79 HX |
309 | struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req)); |
310 | struct shash_desc *desc = ahash_request_ctx(req); | |
311 | ||
312 | desc->tfm = *ctx; | |
90246e79 HX |
313 | |
314 | return crypto_shash_import(desc, in); | |
66f6ce5e HX |
315 | } |
316 | ||
3b2f6df0 HX |
317 | static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm) |
318 | { | |
319 | struct crypto_shash **ctx = crypto_tfm_ctx(tfm); | |
320 | ||
321 | crypto_free_shash(*ctx); | |
322 | } | |
323 | ||
88056ec3 | 324 | int crypto_init_shash_ops_async(struct crypto_tfm *tfm) |
3b2f6df0 HX |
325 | { |
326 | struct crypto_alg *calg = tfm->__crt_alg; | |
66f6ce5e | 327 | struct shash_alg *alg = __crypto_shash_alg(calg); |
88056ec3 | 328 | struct crypto_ahash *crt = __crypto_ahash_cast(tfm); |
3b2f6df0 HX |
329 | struct crypto_shash **ctx = crypto_tfm_ctx(tfm); |
330 | struct crypto_shash *shash; | |
331 | ||
332 | if (!crypto_mod_get(calg)) | |
333 | return -EAGAIN; | |
334 | ||
3f683d61 | 335 | shash = crypto_create_tfm(calg, &crypto_shash_type); |
3b2f6df0 HX |
336 | if (IS_ERR(shash)) { |
337 | crypto_mod_put(calg); | |
338 | return PTR_ERR(shash); | |
339 | } | |
340 | ||
341 | *ctx = shash; | |
342 | tfm->exit = crypto_exit_shash_ops_async; | |
343 | ||
344 | crt->init = shash_async_init; | |
345 | crt->update = shash_async_update; | |
66f6ce5e HX |
346 | crt->final = shash_async_final; |
347 | crt->finup = shash_async_finup; | |
3b2f6df0 | 348 | crt->digest = shash_async_digest; |
ba7d7433 EB |
349 | if (crypto_shash_alg_has_setkey(alg)) |
350 | crt->setkey = shash_async_setkey; | |
00420a65 | 351 | |
9fa68f62 EB |
352 | crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) & |
353 | CRYPTO_TFM_NEED_KEY); | |
66f6ce5e | 354 | |
2b091e32 EB |
355 | crt->export = shash_async_export; |
356 | crt->import = shash_async_import; | |
3b2f6df0 | 357 | |
3b2f6df0 HX |
358 | crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash); |
359 | ||
360 | return 0; | |
361 | } | |
362 | ||
ed3630b8 HX |
363 | struct crypto_ahash *crypto_clone_shash_ops_async(struct crypto_ahash *nhash, |
364 | struct crypto_ahash *hash) | |
365 | { | |
366 | struct crypto_shash **nctx = crypto_ahash_ctx(nhash); | |
367 | struct crypto_shash **ctx = crypto_ahash_ctx(hash); | |
368 | struct crypto_shash *shash; | |
369 | ||
370 | shash = crypto_clone_shash(*ctx); | |
371 | if (IS_ERR(shash)) { | |
372 | crypto_free_ahash(nhash); | |
373 | return ERR_CAST(shash); | |
374 | } | |
375 | ||
376 | *nctx = shash; | |
377 | ||
378 | return nhash; | |
379 | } | |
380 | ||
fbce6be5 HX |
381 | static void crypto_shash_exit_tfm(struct crypto_tfm *tfm) |
382 | { | |
383 | struct crypto_shash *hash = __crypto_shash_cast(tfm); | |
384 | struct shash_alg *alg = crypto_shash_alg(hash); | |
385 | ||
386 | alg->exit_tfm(hash); | |
387 | } | |
388 | ||
2ca33da1 | 389 | static int crypto_shash_init_tfm(struct crypto_tfm *tfm) |
7b5a080b | 390 | { |
113adefc | 391 | struct crypto_shash *hash = __crypto_shash_cast(tfm); |
9fa68f62 | 392 | struct shash_alg *alg = crypto_shash_alg(hash); |
fbce6be5 | 393 | int err; |
9fa68f62 EB |
394 | |
395 | hash->descsize = alg->descsize; | |
396 | ||
ba7d7433 | 397 | shash_set_needkey(hash, alg); |
113adefc | 398 | |
fbce6be5 HX |
399 | if (alg->exit_tfm) |
400 | tfm->exit = crypto_shash_exit_tfm; | |
401 | ||
402 | if (!alg->init_tfm) | |
403 | return 0; | |
404 | ||
405 | err = alg->init_tfm(hash); | |
406 | if (err) | |
407 | return err; | |
408 | ||
409 | /* ->init_tfm() may have increased the descsize. */ | |
410 | if (WARN_ON_ONCE(hash->descsize > HASH_MAX_DESCSIZE)) { | |
411 | if (alg->exit_tfm) | |
412 | alg->exit_tfm(hash); | |
413 | return -EINVAL; | |
414 | } | |
415 | ||
7b5a080b HX |
416 | return 0; |
417 | } | |
418 | ||
48fb3e57 EB |
419 | static void crypto_shash_free_instance(struct crypto_instance *inst) |
420 | { | |
421 | struct shash_instance *shash = shash_instance(inst); | |
422 | ||
48fb3e57 EB |
423 | shash->free(shash); |
424 | } | |
425 | ||
c0f9e01d HX |
426 | static int __maybe_unused crypto_shash_report( |
427 | struct sk_buff *skb, struct crypto_alg *alg) | |
f4d663ce SK |
428 | { |
429 | struct crypto_report_hash rhash; | |
430 | struct shash_alg *salg = __crypto_shash_alg(alg); | |
431 | ||
37db69e0 EB |
432 | memset(&rhash, 0, sizeof(rhash)); |
433 | ||
434 | strscpy(rhash.type, "shash", sizeof(rhash.type)); | |
9a5467bf | 435 | |
f4d663ce SK |
436 | rhash.blocksize = alg->cra_blocksize; |
437 | rhash.digestsize = salg->digestsize; | |
438 | ||
37db69e0 | 439 | return nla_put(skb, CRYPTOCFGA_REPORT_HASH, sizeof(rhash), &rhash); |
f4d663ce SK |
440 | } |
441 | ||
7b5a080b | 442 | static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg) |
d8c34b94 | 443 | __maybe_unused; |
7b5a080b HX |
444 | static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg) |
445 | { | |
446 | struct shash_alg *salg = __crypto_shash_alg(alg); | |
447 | ||
448 | seq_printf(m, "type : shash\n"); | |
449 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
450 | seq_printf(m, "digestsize : %u\n", salg->digestsize); | |
7b5a080b HX |
451 | } |
452 | ||
42808e5d HX |
453 | static int __maybe_unused crypto_shash_report_stat( |
454 | struct sk_buff *skb, struct crypto_alg *alg) | |
455 | { | |
456 | return crypto_hash_report_stat(skb, alg, "shash"); | |
457 | } | |
458 | ||
7b5a080b | 459 | static const struct crypto_type crypto_shash_type = { |
ac611680 | 460 | .extsize = crypto_alg_extsize, |
7b5a080b | 461 | .init_tfm = crypto_shash_init_tfm, |
48fb3e57 | 462 | .free = crypto_shash_free_instance, |
7b5a080b HX |
463 | #ifdef CONFIG_PROC_FS |
464 | .show = crypto_shash_show, | |
465 | #endif | |
b8969a1b | 466 | #if IS_ENABLED(CONFIG_CRYPTO_USER) |
f4d663ce | 467 | .report = crypto_shash_report, |
c0f9e01d | 468 | #endif |
42808e5d HX |
469 | #ifdef CONFIG_CRYPTO_STATS |
470 | .report_stat = crypto_shash_report_stat, | |
471 | #endif | |
7b5a080b HX |
472 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, |
473 | .maskset = CRYPTO_ALG_TYPE_MASK, | |
474 | .type = CRYPTO_ALG_TYPE_SHASH, | |
475 | .tfmsize = offsetof(struct crypto_shash, base), | |
476 | }; | |
477 | ||
fdfad1ff EB |
478 | int crypto_grab_shash(struct crypto_shash_spawn *spawn, |
479 | struct crypto_instance *inst, | |
480 | const char *name, u32 type, u32 mask) | |
481 | { | |
482 | spawn->base.frontend = &crypto_shash_type; | |
483 | return crypto_grab_spawn(&spawn->base, inst, name, type, mask); | |
484 | } | |
485 | EXPORT_SYMBOL_GPL(crypto_grab_shash); | |
486 | ||
7b5a080b HX |
487 | struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type, |
488 | u32 mask) | |
489 | { | |
3f683d61 | 490 | return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask); |
7b5a080b HX |
491 | } |
492 | EXPORT_SYMBOL_GPL(crypto_alloc_shash); | |
493 | ||
85cc4243 HR |
494 | int crypto_has_shash(const char *alg_name, u32 type, u32 mask) |
495 | { | |
496 | return crypto_type_has_alg(alg_name, &crypto_shash_type, type, mask); | |
497 | } | |
498 | EXPORT_SYMBOL_GPL(crypto_has_shash); | |
499 | ||
ed3630b8 HX |
500 | struct crypto_shash *crypto_clone_shash(struct crypto_shash *hash) |
501 | { | |
502 | struct crypto_tfm *tfm = crypto_shash_tfm(hash); | |
503 | struct shash_alg *alg = crypto_shash_alg(hash); | |
504 | struct crypto_shash *nhash; | |
505 | int err; | |
506 | ||
507 | if (!crypto_shash_alg_has_setkey(alg)) { | |
508 | tfm = crypto_tfm_get(tfm); | |
509 | if (IS_ERR(tfm)) | |
510 | return ERR_CAST(tfm); | |
511 | ||
512 | return hash; | |
513 | } | |
514 | ||
b7be31b0 | 515 | if (!alg->clone_tfm && (alg->init_tfm || alg->base.cra_init)) |
ed3630b8 HX |
516 | return ERR_PTR(-ENOSYS); |
517 | ||
518 | nhash = crypto_clone_tfm(&crypto_shash_type, tfm); | |
519 | if (IS_ERR(nhash)) | |
520 | return nhash; | |
521 | ||
522 | nhash->descsize = hash->descsize; | |
523 | ||
b7be31b0 HX |
524 | if (alg->clone_tfm) { |
525 | err = alg->clone_tfm(nhash, hash); | |
526 | if (err) { | |
527 | crypto_free_shash(nhash); | |
528 | return ERR_PTR(err); | |
529 | } | |
ed3630b8 HX |
530 | } |
531 | ||
532 | return nhash; | |
533 | } | |
534 | EXPORT_SYMBOL_GPL(crypto_clone_shash); | |
535 | ||
42808e5d | 536 | int hash_prepare_alg(struct hash_alg_common *alg) |
7b5a080b | 537 | { |
42808e5d | 538 | struct crypto_istat_hash *istat = hash_get_stat(alg); |
7b5a080b HX |
539 | struct crypto_alg *base = &alg->base; |
540 | ||
9697b328 | 541 | if (alg->digestsize > HASH_MAX_DIGESTSIZE) |
7b5a080b HX |
542 | return -EINVAL; |
543 | ||
42808e5d HX |
544 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; |
545 | ||
546 | if (IS_ENABLED(CONFIG_CRYPTO_STATS)) | |
547 | memset(istat, 0, sizeof(*istat)); | |
548 | ||
549 | return 0; | |
550 | } | |
551 | ||
552 | static int shash_prepare_alg(struct shash_alg *alg) | |
553 | { | |
554 | struct crypto_alg *base = &alg->halg.base; | |
555 | int err; | |
556 | ||
557 | if (alg->descsize > HASH_MAX_DESCSIZE) | |
558 | return -EINVAL; | |
559 | ||
345bfa3c EB |
560 | /* alignmask is not useful for shash, so it is not supported. */ |
561 | if (base->cra_alignmask) | |
1c799571 HX |
562 | return -EINVAL; |
563 | ||
41a2e94f EB |
564 | if ((alg->export && !alg->import) || (alg->import && !alg->export)) |
565 | return -EINVAL; | |
566 | ||
42808e5d HX |
567 | err = hash_prepare_alg(&alg->halg); |
568 | if (err) | |
569 | return err; | |
570 | ||
7b5a080b | 571 | base->cra_type = &crypto_shash_type; |
7b5a080b | 572 | base->cra_flags |= CRYPTO_ALG_TYPE_SHASH; |
99d27e1c | 573 | |
08debaa5 EB |
574 | /* |
575 | * Handle missing optional functions. For each one we can either | |
576 | * install a default here, or we can leave the pointer as NULL and check | |
577 | * the pointer for NULL in crypto_shash_*(), avoiding an indirect call | |
578 | * when the default behavior is desired. For ->finup and ->digest we | |
579 | * install defaults, since for optimal performance algorithms should | |
580 | * implement these anyway. On the other hand, for ->import and | |
581 | * ->export the common case and best performance comes from the simple | |
582 | * memcpy of the shash_desc_ctx, so when those pointers are NULL we | |
583 | * leave them NULL and provide the memcpy with no indirect call. | |
584 | */ | |
8267adab | 585 | if (!alg->finup) |
313a4074 | 586 | alg->finup = shash_default_finup; |
8267adab | 587 | if (!alg->digest) |
313a4074 | 588 | alg->digest = shash_default_digest; |
08debaa5 | 589 | if (!alg->export) |
42808e5d | 590 | alg->halg.statesize = alg->descsize; |
57cfe44b HX |
591 | if (!alg->setkey) |
592 | alg->setkey = shash_no_setkey; | |
99d27e1c | 593 | |
619a6ebd HX |
594 | return 0; |
595 | } | |
596 | ||
597 | int crypto_register_shash(struct shash_alg *alg) | |
598 | { | |
599 | struct crypto_alg *base = &alg->base; | |
600 | int err; | |
601 | ||
602 | err = shash_prepare_alg(alg); | |
603 | if (err) | |
604 | return err; | |
7b5a080b HX |
605 | |
606 | return crypto_register_alg(base); | |
607 | } | |
608 | EXPORT_SYMBOL_GPL(crypto_register_shash); | |
609 | ||
c6d633a9 | 610 | void crypto_unregister_shash(struct shash_alg *alg) |
7b5a080b | 611 | { |
c6d633a9 | 612 | crypto_unregister_alg(&alg->base); |
7b5a080b HX |
613 | } |
614 | EXPORT_SYMBOL_GPL(crypto_unregister_shash); | |
615 | ||
50fc3e8d JK |
616 | int crypto_register_shashes(struct shash_alg *algs, int count) |
617 | { | |
618 | int i, ret; | |
619 | ||
620 | for (i = 0; i < count; i++) { | |
621 | ret = crypto_register_shash(&algs[i]); | |
622 | if (ret) | |
623 | goto err; | |
624 | } | |
625 | ||
626 | return 0; | |
627 | ||
628 | err: | |
629 | for (--i; i >= 0; --i) | |
630 | crypto_unregister_shash(&algs[i]); | |
631 | ||
632 | return ret; | |
633 | } | |
634 | EXPORT_SYMBOL_GPL(crypto_register_shashes); | |
635 | ||
c6d633a9 | 636 | void crypto_unregister_shashes(struct shash_alg *algs, int count) |
50fc3e8d | 637 | { |
c6d633a9 | 638 | int i; |
50fc3e8d | 639 | |
c6d633a9 EB |
640 | for (i = count - 1; i >= 0; --i) |
641 | crypto_unregister_shash(&algs[i]); | |
50fc3e8d JK |
642 | } |
643 | EXPORT_SYMBOL_GPL(crypto_unregister_shashes); | |
644 | ||
619a6ebd HX |
645 | int shash_register_instance(struct crypto_template *tmpl, |
646 | struct shash_instance *inst) | |
647 | { | |
648 | int err; | |
649 | ||
d4fdc2df EB |
650 | if (WARN_ON(!inst->free)) |
651 | return -EINVAL; | |
652 | ||
619a6ebd HX |
653 | err = shash_prepare_alg(&inst->alg); |
654 | if (err) | |
655 | return err; | |
656 | ||
657 | return crypto_register_instance(tmpl, shash_crypto_instance(inst)); | |
658 | } | |
659 | EXPORT_SYMBOL_GPL(shash_register_instance); | |
660 | ||
a39c66cc | 661 | void shash_free_singlespawn_instance(struct shash_instance *inst) |
2e4fddd8 | 662 | { |
a39c66cc EB |
663 | crypto_drop_spawn(shash_instance_ctx(inst)); |
664 | kfree(inst); | |
2e4fddd8 | 665 | } |
a39c66cc | 666 | EXPORT_SYMBOL_GPL(shash_free_singlespawn_instance); |
2e4fddd8 | 667 | |
7b5a080b HX |
668 | MODULE_LICENSE("GPL"); |
669 | MODULE_DESCRIPTION("Synchronous cryptographic hash type"); |