Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Scatterlist Cryptographic API. | |
3 | * | |
4 | * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> | |
5 | * Copyright (c) 2002 David S. Miller (davem@redhat.com) | |
5cb1454b | 6 | * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au> |
1da177e4 LT |
7 | * |
8 | * Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no> | |
991d1740 | 9 | * and Nettle, by Niels Möller. |
1da177e4 LT |
10 | * |
11 | * This program is free software; you can redistribute it and/or modify it | |
12 | * under the terms of the GNU General Public License as published by the Free | |
3d01a33b | 13 | * Software Foundation; either version 2 of the License, or (at your option) |
1da177e4 LT |
14 | * any later version. |
15 | * | |
16 | */ | |
a61cc448 | 17 | |
6bfd4809 | 18 | #include <linux/err.h> |
1da177e4 | 19 | #include <linux/errno.h> |
5cb1454b | 20 | #include <linux/kernel.h> |
176c3652 | 21 | #include <linux/kmod.h> |
2b8c19db | 22 | #include <linux/module.h> |
2825982d | 23 | #include <linux/param.h> |
174cd4b1 | 24 | #include <linux/sched/signal.h> |
1da177e4 | 25 | #include <linux/slab.h> |
5cb1454b | 26 | #include <linux/string.h> |
ada69a16 | 27 | #include <linux/completion.h> |
1da177e4 LT |
28 | #include "internal.h" |
29 | ||
30 | LIST_HEAD(crypto_alg_list); | |
cce9e06d | 31 | EXPORT_SYMBOL_GPL(crypto_alg_list); |
1da177e4 | 32 | DECLARE_RWSEM(crypto_alg_sem); |
cce9e06d | 33 | EXPORT_SYMBOL_GPL(crypto_alg_sem); |
1da177e4 | 34 | |
2825982d HX |
35 | BLOCKING_NOTIFIER_HEAD(crypto_chain); |
36 | EXPORT_SYMBOL_GPL(crypto_chain); | |
37 | ||
77dbd7a9 HX |
38 | static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg); |
39 | ||
2825982d | 40 | struct crypto_alg *crypto_mod_get(struct crypto_alg *alg) |
6521f302 HX |
41 | { |
42 | return try_module_get(alg->cra_module) ? crypto_alg_get(alg) : NULL; | |
1da177e4 | 43 | } |
2825982d | 44 | EXPORT_SYMBOL_GPL(crypto_mod_get); |
1da177e4 | 45 | |
2825982d | 46 | void crypto_mod_put(struct crypto_alg *alg) |
1da177e4 | 47 | { |
da7cd59a HX |
48 | struct module *module = alg->cra_module; |
49 | ||
6521f302 | 50 | crypto_alg_put(alg); |
da7cd59a | 51 | module_put(module); |
1da177e4 | 52 | } |
2825982d | 53 | EXPORT_SYMBOL_GPL(crypto_mod_put); |
1da177e4 | 54 | |
73d3864a HX |
55 | static inline int crypto_is_test_larval(struct crypto_larval *larval) |
56 | { | |
57 | return larval->alg.cra_driver_name[0]; | |
58 | } | |
59 | ||
c51b6c81 HX |
60 | static struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type, |
61 | u32 mask) | |
1da177e4 LT |
62 | { |
63 | struct crypto_alg *q, *alg = NULL; | |
2825982d | 64 | int best = -2; |
1da177e4 | 65 | |
1da177e4 | 66 | list_for_each_entry(q, &crypto_alg_list, cra_list) { |
5cb1454b HX |
67 | int exact, fuzzy; |
68 | ||
6bfd4809 HX |
69 | if (crypto_is_moribund(q)) |
70 | continue; | |
71 | ||
492e2b63 HX |
72 | if ((q->cra_flags ^ type) & mask) |
73 | continue; | |
74 | ||
75 | if (crypto_is_larval(q) && | |
73d3864a | 76 | !crypto_is_test_larval((struct crypto_larval *)q) && |
492e2b63 HX |
77 | ((struct crypto_larval *)q)->mask != mask) |
78 | continue; | |
79 | ||
5cb1454b HX |
80 | exact = !strcmp(q->cra_driver_name, name); |
81 | fuzzy = !strcmp(q->cra_name, name); | |
82 | if (!exact && !(fuzzy && q->cra_priority > best)) | |
83 | continue; | |
84 | ||
72fa4919 | 85 | if (unlikely(!crypto_mod_get(q))) |
5cb1454b HX |
86 | continue; |
87 | ||
88 | best = q->cra_priority; | |
89 | if (alg) | |
72fa4919 | 90 | crypto_mod_put(alg); |
5cb1454b HX |
91 | alg = q; |
92 | ||
93 | if (exact) | |
1da177e4 | 94 | break; |
1da177e4 | 95 | } |
2825982d HX |
96 | |
97 | return alg; | |
98 | } | |
2825982d HX |
99 | |
100 | static void crypto_larval_destroy(struct crypto_alg *alg) | |
101 | { | |
102 | struct crypto_larval *larval = (void *)alg; | |
103 | ||
104 | BUG_ON(!crypto_is_larval(alg)); | |
105 | if (larval->adult) | |
106 | crypto_mod_put(larval->adult); | |
107 | kfree(larval); | |
108 | } | |
109 | ||
73d3864a | 110 | struct crypto_larval *crypto_larval_alloc(const char *name, u32 type, u32 mask) |
2825982d | 111 | { |
2825982d HX |
112 | struct crypto_larval *larval; |
113 | ||
114 | larval = kzalloc(sizeof(*larval), GFP_KERNEL); | |
115 | if (!larval) | |
6bfd4809 | 116 | return ERR_PTR(-ENOMEM); |
2825982d | 117 | |
492e2b63 HX |
118 | larval->mask = mask; |
119 | larval->alg.cra_flags = CRYPTO_ALG_LARVAL | type; | |
2825982d HX |
120 | larval->alg.cra_priority = -1; |
121 | larval->alg.cra_destroy = crypto_larval_destroy; | |
122 | ||
2825982d HX |
123 | strlcpy(larval->alg.cra_name, name, CRYPTO_MAX_ALG_NAME); |
124 | init_completion(&larval->completion); | |
125 | ||
73d3864a HX |
126 | return larval; |
127 | } | |
128 | EXPORT_SYMBOL_GPL(crypto_larval_alloc); | |
129 | ||
130 | static struct crypto_alg *crypto_larval_add(const char *name, u32 type, | |
131 | u32 mask) | |
132 | { | |
133 | struct crypto_alg *alg; | |
134 | struct crypto_larval *larval; | |
135 | ||
136 | larval = crypto_larval_alloc(name, type, mask); | |
137 | if (IS_ERR(larval)) | |
138 | return ERR_CAST(larval); | |
139 | ||
ce8614a3 | 140 | refcount_set(&larval->alg.cra_refcnt, 2); |
73d3864a | 141 | |
2825982d | 142 | down_write(&crypto_alg_sem); |
492e2b63 | 143 | alg = __crypto_alg_lookup(name, type, mask); |
2825982d HX |
144 | if (!alg) { |
145 | alg = &larval->alg; | |
146 | list_add(&alg->cra_list, &crypto_alg_list); | |
147 | } | |
148 | up_write(&crypto_alg_sem); | |
149 | ||
77dbd7a9 | 150 | if (alg != &larval->alg) { |
2825982d | 151 | kfree(larval); |
77dbd7a9 HX |
152 | if (crypto_is_larval(alg)) |
153 | alg = crypto_larval_wait(alg); | |
154 | } | |
2825982d HX |
155 | |
156 | return alg; | |
157 | } | |
158 | ||
b9c55aa4 | 159 | void crypto_larval_kill(struct crypto_alg *alg) |
2825982d HX |
160 | { |
161 | struct crypto_larval *larval = (void *)alg; | |
162 | ||
163 | down_write(&crypto_alg_sem); | |
164 | list_del(&alg->cra_list); | |
165 | up_write(&crypto_alg_sem); | |
fe3c5206 | 166 | complete_all(&larval->completion); |
2825982d HX |
167 | crypto_alg_put(alg); |
168 | } | |
b9c55aa4 | 169 | EXPORT_SYMBOL_GPL(crypto_larval_kill); |
2825982d HX |
170 | |
171 | static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg) | |
172 | { | |
173 | struct crypto_larval *larval = (void *)alg; | |
73d3864a HX |
174 | long timeout; |
175 | ||
3fc89adb | 176 | timeout = wait_for_completion_killable_timeout( |
73d3864a | 177 | &larval->completion, 60 * HZ); |
2825982d | 178 | |
2825982d | 179 | alg = larval->adult; |
73d3864a HX |
180 | if (timeout < 0) |
181 | alg = ERR_PTR(-EINTR); | |
182 | else if (!timeout) | |
183 | alg = ERR_PTR(-ETIMEDOUT); | |
184 | else if (!alg) | |
6bfd4809 | 185 | alg = ERR_PTR(-ENOENT); |
73d3864a HX |
186 | else if (crypto_is_test_larval(larval) && |
187 | !(alg->cra_flags & CRYPTO_ALG_TESTED)) | |
188 | alg = ERR_PTR(-EAGAIN); | |
189 | else if (!crypto_mod_get(alg)) | |
190 | alg = ERR_PTR(-EAGAIN); | |
2825982d HX |
191 | crypto_mod_put(&larval->alg); |
192 | ||
193 | return alg; | |
194 | } | |
195 | ||
3ca1e994 HX |
196 | static struct crypto_alg *crypto_alg_lookup(const char *name, u32 type, |
197 | u32 mask) | |
2825982d HX |
198 | { |
199 | struct crypto_alg *alg; | |
eb02c38f HX |
200 | u32 test = 0; |
201 | ||
202 | if (!((type | mask) & CRYPTO_ALG_TESTED)) | |
203 | test |= CRYPTO_ALG_TESTED; | |
2825982d | 204 | |
2825982d | 205 | down_read(&crypto_alg_sem); |
eb02c38f HX |
206 | alg = __crypto_alg_lookup(name, type | test, mask | test); |
207 | if (!alg && test) | |
208 | alg = __crypto_alg_lookup(name, type, mask) ? | |
209 | ERR_PTR(-ELIBBAD) : NULL; | |
1da177e4 | 210 | up_read(&crypto_alg_sem); |
2825982d | 211 | |
1da177e4 LT |
212 | return alg; |
213 | } | |
214 | ||
cadc9ab5 EB |
215 | static struct crypto_alg *crypto_larval_lookup(const char *name, u32 type, |
216 | u32 mask) | |
176c3652 | 217 | { |
2825982d | 218 | struct crypto_alg *alg; |
2825982d | 219 | |
6bfd4809 HX |
220 | if (!name) |
221 | return ERR_PTR(-ENOENT); | |
222 | ||
430b441c | 223 | type &= ~(CRYPTO_ALG_LARVAL | CRYPTO_ALG_DEAD); |
6bfd4809 | 224 | mask &= ~(CRYPTO_ALG_LARVAL | CRYPTO_ALG_DEAD); |
492e2b63 | 225 | |
a760a665 HX |
226 | alg = crypto_alg_lookup(name, type, mask); |
227 | if (!alg) { | |
5d26a105 | 228 | request_module("crypto-%s", name); |
a760a665 | 229 | |
37fc334c | 230 | if (!((type ^ CRYPTO_ALG_NEED_FALLBACK) & mask & |
aa07a699 | 231 | CRYPTO_ALG_NEED_FALLBACK)) |
5d26a105 | 232 | request_module("crypto-%s-all", name); |
a760a665 HX |
233 | |
234 | alg = crypto_alg_lookup(name, type, mask); | |
235 | } | |
236 | ||
eb02c38f HX |
237 | if (!IS_ERR_OR_NULL(alg) && crypto_is_larval(alg)) |
238 | alg = crypto_larval_wait(alg); | |
239 | else if (!alg) | |
240 | alg = crypto_larval_add(name, type, mask); | |
2825982d | 241 | |
eb02c38f | 242 | return alg; |
b9c55aa4 | 243 | } |
b9c55aa4 | 244 | |
73d3864a HX |
245 | int crypto_probing_notify(unsigned long val, void *v) |
246 | { | |
247 | int ok; | |
248 | ||
249 | ok = blocking_notifier_call_chain(&crypto_chain, val, v); | |
250 | if (ok == NOTIFY_DONE) { | |
251 | request_module("cryptomgr"); | |
252 | ok = blocking_notifier_call_chain(&crypto_chain, val, v); | |
253 | } | |
254 | ||
255 | return ok; | |
256 | } | |
257 | EXPORT_SYMBOL_GPL(crypto_probing_notify); | |
258 | ||
b9c55aa4 HX |
259 | struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask) |
260 | { | |
261 | struct crypto_alg *alg; | |
262 | struct crypto_alg *larval; | |
263 | int ok; | |
264 | ||
06ca7f68 SM |
265 | /* |
266 | * If the internal flag is set for a cipher, require a caller to | |
267 | * to invoke the cipher with the internal flag to use that cipher. | |
268 | * Also, if a caller wants to allocate a cipher that may or may | |
269 | * not be an internal cipher, use type | CRYPTO_ALG_INTERNAL and | |
270 | * !(mask & CRYPTO_ALG_INTERNAL). | |
271 | */ | |
272 | if (!((type | mask) & CRYPTO_ALG_INTERNAL)) | |
273 | mask |= CRYPTO_ALG_INTERNAL; | |
274 | ||
b9c55aa4 | 275 | larval = crypto_larval_lookup(name, type, mask); |
6bfd4809 | 276 | if (IS_ERR(larval) || !crypto_is_larval(larval)) |
2825982d HX |
277 | return larval; |
278 | ||
73d3864a | 279 | ok = crypto_probing_notify(CRYPTO_MSG_ALG_REQUEST, larval); |
2b8c19db HX |
280 | |
281 | if (ok == NOTIFY_STOP) | |
2825982d HX |
282 | alg = crypto_larval_wait(larval); |
283 | else { | |
284 | crypto_mod_put(larval); | |
6bfd4809 | 285 | alg = ERR_PTR(-ENOENT); |
2825982d HX |
286 | } |
287 | crypto_larval_kill(larval); | |
288 | return alg; | |
176c3652 | 289 | } |
492e2b63 | 290 | EXPORT_SYMBOL_GPL(crypto_alg_mod_lookup); |
176c3652 | 291 | |
27d2a330 | 292 | static int crypto_init_ops(struct crypto_tfm *tfm, u32 type, u32 mask) |
1da177e4 | 293 | { |
27d2a330 | 294 | const struct crypto_type *type_obj = tfm->__crt_alg->cra_type; |
e853c3cf | 295 | |
27d2a330 HX |
296 | if (type_obj) |
297 | return type_obj->init(tfm, type, mask); | |
e853c3cf | 298 | |
1da177e4 LT |
299 | switch (crypto_tfm_alg_type(tfm)) { |
300 | case CRYPTO_ALG_TYPE_CIPHER: | |
301 | return crypto_init_cipher_ops(tfm); | |
004a403c | 302 | |
1da177e4 LT |
303 | case CRYPTO_ALG_TYPE_COMPRESS: |
304 | return crypto_init_compress_ops(tfm); | |
3d01a33b | 305 | |
1da177e4 LT |
306 | default: |
307 | break; | |
308 | } | |
3d01a33b | 309 | |
1da177e4 LT |
310 | BUG(); |
311 | return -EINVAL; | |
312 | } | |
313 | ||
314 | static void crypto_exit_ops(struct crypto_tfm *tfm) | |
315 | { | |
e853c3cf HX |
316 | const struct crypto_type *type = tfm->__crt_alg->cra_type; |
317 | ||
9c8ae17b EB |
318 | if (type && tfm->exit) |
319 | tfm->exit(tfm); | |
1da177e4 LT |
320 | } |
321 | ||
27d2a330 | 322 | static unsigned int crypto_ctxsize(struct crypto_alg *alg, u32 type, u32 mask) |
fbdae9f3 | 323 | { |
27d2a330 | 324 | const struct crypto_type *type_obj = alg->cra_type; |
fbdae9f3 HX |
325 | unsigned int len; |
326 | ||
e853c3cf | 327 | len = alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1); |
27d2a330 HX |
328 | if (type_obj) |
329 | return len + type_obj->ctxsize(alg, type, mask); | |
e853c3cf | 330 | |
fbdae9f3 HX |
331 | switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) { |
332 | default: | |
333 | BUG(); | |
334 | ||
335 | case CRYPTO_ALG_TYPE_CIPHER: | |
f1ddcaf3 | 336 | len += crypto_cipher_ctxsize(alg); |
fbdae9f3 | 337 | break; |
6941c3a0 | 338 | |
fbdae9f3 | 339 | case CRYPTO_ALG_TYPE_COMPRESS: |
f1ddcaf3 | 340 | len += crypto_compress_ctxsize(alg); |
fbdae9f3 HX |
341 | break; |
342 | } | |
343 | ||
e853c3cf | 344 | return len; |
fbdae9f3 HX |
345 | } |
346 | ||
6bfd4809 HX |
347 | void crypto_shoot_alg(struct crypto_alg *alg) |
348 | { | |
349 | down_write(&crypto_alg_sem); | |
350 | alg->cra_flags |= CRYPTO_ALG_DYING; | |
351 | up_write(&crypto_alg_sem); | |
352 | } | |
353 | EXPORT_SYMBOL_GPL(crypto_shoot_alg); | |
354 | ||
27d2a330 HX |
355 | struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type, |
356 | u32 mask) | |
1da177e4 LT |
357 | { |
358 | struct crypto_tfm *tfm = NULL; | |
fbdae9f3 | 359 | unsigned int tfm_size; |
6bfd4809 | 360 | int err = -ENOMEM; |
fbdae9f3 | 361 | |
27d2a330 | 362 | tfm_size = sizeof(*tfm) + crypto_ctxsize(alg, type, mask); |
bbeb563f | 363 | tfm = kzalloc(tfm_size, GFP_KERNEL); |
1da177e4 | 364 | if (tfm == NULL) |
9765d262 | 365 | goto out_err; |
1da177e4 | 366 | |
1da177e4 | 367 | tfm->__crt_alg = alg; |
6bfd4809 | 368 | |
27d2a330 | 369 | err = crypto_init_ops(tfm, type, mask); |
6bfd4809 | 370 | if (err) |
1da177e4 | 371 | goto out_free_tfm; |
c7fc0599 | 372 | |
4a779486 | 373 | if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm))) |
c7fc0599 | 374 | goto cra_init_failed; |
1da177e4 LT |
375 | |
376 | goto out; | |
377 | ||
c7fc0599 HX |
378 | cra_init_failed: |
379 | crypto_exit_ops(tfm); | |
1da177e4 | 380 | out_free_tfm: |
4a779486 HX |
381 | if (err == -EAGAIN) |
382 | crypto_shoot_alg(alg); | |
1da177e4 | 383 | kfree(tfm); |
9765d262 | 384 | out_err: |
6bfd4809 | 385 | tfm = ERR_PTR(err); |
1da177e4 LT |
386 | out: |
387 | return tfm; | |
388 | } | |
6bfd4809 HX |
389 | EXPORT_SYMBOL_GPL(__crypto_alloc_tfm); |
390 | ||
6d7d684d HX |
391 | /* |
392 | * crypto_alloc_base - Locate algorithm and allocate transform | |
393 | * @alg_name: Name of algorithm | |
394 | * @type: Type of algorithm | |
395 | * @mask: Mask for type comparison | |
396 | * | |
7b0bac64 | 397 | * This function should not be used by new algorithm types. |
fd1a1900 | 398 | * Please use crypto_alloc_tfm instead. |
7b0bac64 | 399 | * |
6d7d684d HX |
400 | * crypto_alloc_base() will first attempt to locate an already loaded |
401 | * algorithm. If that fails and the kernel supports dynamically loadable | |
402 | * modules, it will then attempt to load a module of the same name or | |
403 | * alias. If that fails it will send a query to any loaded crypto manager | |
404 | * to construct an algorithm on the fly. A refcount is grabbed on the | |
405 | * algorithm which is then associated with the new transform. | |
406 | * | |
407 | * The returned transform is of a non-determinate type. Most people | |
408 | * should use one of the more specific allocation functions such as | |
409 | * crypto_alloc_blkcipher. | |
410 | * | |
411 | * In case of error the return value is an error pointer. | |
412 | */ | |
413 | struct crypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask) | |
414 | { | |
415 | struct crypto_tfm *tfm; | |
416 | int err; | |
417 | ||
418 | for (;;) { | |
419 | struct crypto_alg *alg; | |
420 | ||
421 | alg = crypto_alg_mod_lookup(alg_name, type, mask); | |
9765d262 AM |
422 | if (IS_ERR(alg)) { |
423 | err = PTR_ERR(alg); | |
6d7d684d | 424 | goto err; |
9765d262 | 425 | } |
6d7d684d | 426 | |
27d2a330 | 427 | tfm = __crypto_alloc_tfm(alg, type, mask); |
6d7d684d | 428 | if (!IS_ERR(tfm)) |
9765d262 | 429 | return tfm; |
6d7d684d HX |
430 | |
431 | crypto_mod_put(alg); | |
432 | err = PTR_ERR(tfm); | |
433 | ||
434 | err: | |
435 | if (err != -EAGAIN) | |
436 | break; | |
3fc89adb | 437 | if (fatal_signal_pending(current)) { |
6d7d684d HX |
438 | err = -EINTR; |
439 | break; | |
440 | } | |
9765d262 | 441 | } |
6d7d684d | 442 | |
9765d262 | 443 | return ERR_PTR(err); |
6d7d684d HX |
444 | } |
445 | EXPORT_SYMBOL_GPL(crypto_alloc_base); | |
7b0bac64 | 446 | |
3f683d61 HX |
447 | void *crypto_create_tfm(struct crypto_alg *alg, |
448 | const struct crypto_type *frontend) | |
7b0bac64 HX |
449 | { |
450 | char *mem; | |
451 | struct crypto_tfm *tfm = NULL; | |
452 | unsigned int tfmsize; | |
453 | unsigned int total; | |
454 | int err = -ENOMEM; | |
455 | ||
456 | tfmsize = frontend->tfmsize; | |
2ca33da1 | 457 | total = tfmsize + sizeof(*tfm) + frontend->extsize(alg); |
7b0bac64 HX |
458 | |
459 | mem = kzalloc(total, GFP_KERNEL); | |
460 | if (mem == NULL) | |
461 | goto out_err; | |
462 | ||
463 | tfm = (struct crypto_tfm *)(mem + tfmsize); | |
464 | tfm->__crt_alg = alg; | |
465 | ||
2ca33da1 | 466 | err = frontend->init_tfm(tfm); |
7b0bac64 HX |
467 | if (err) |
468 | goto out_free_tfm; | |
469 | ||
470 | if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm))) | |
471 | goto cra_init_failed; | |
472 | ||
473 | goto out; | |
474 | ||
475 | cra_init_failed: | |
476 | crypto_exit_ops(tfm); | |
477 | out_free_tfm: | |
478 | if (err == -EAGAIN) | |
479 | crypto_shoot_alg(alg); | |
480 | kfree(mem); | |
481 | out_err: | |
3f683d61 | 482 | mem = ERR_PTR(err); |
7b0bac64 | 483 | out: |
3f683d61 | 484 | return mem; |
7b0bac64 HX |
485 | } |
486 | EXPORT_SYMBOL_GPL(crypto_create_tfm); | |
487 | ||
d06854f0 HX |
488 | struct crypto_alg *crypto_find_alg(const char *alg_name, |
489 | const struct crypto_type *frontend, | |
490 | u32 type, u32 mask) | |
491 | { | |
d06854f0 HX |
492 | if (frontend) { |
493 | type &= frontend->maskclear; | |
494 | mask &= frontend->maskclear; | |
495 | type |= frontend->type; | |
496 | mask |= frontend->maskset; | |
d06854f0 HX |
497 | } |
498 | ||
4989d4f0 | 499 | return crypto_alg_mod_lookup(alg_name, type, mask); |
d06854f0 HX |
500 | } |
501 | EXPORT_SYMBOL_GPL(crypto_find_alg); | |
502 | ||
7b0bac64 HX |
503 | /* |
504 | * crypto_alloc_tfm - Locate algorithm and allocate transform | |
505 | * @alg_name: Name of algorithm | |
506 | * @frontend: Frontend algorithm type | |
507 | * @type: Type of algorithm | |
508 | * @mask: Mask for type comparison | |
509 | * | |
510 | * crypto_alloc_tfm() will first attempt to locate an already loaded | |
511 | * algorithm. If that fails and the kernel supports dynamically loadable | |
512 | * modules, it will then attempt to load a module of the same name or | |
513 | * alias. If that fails it will send a query to any loaded crypto manager | |
514 | * to construct an algorithm on the fly. A refcount is grabbed on the | |
515 | * algorithm which is then associated with the new transform. | |
516 | * | |
517 | * The returned transform is of a non-determinate type. Most people | |
518 | * should use one of the more specific allocation functions such as | |
519 | * crypto_alloc_blkcipher. | |
520 | * | |
521 | * In case of error the return value is an error pointer. | |
522 | */ | |
3f683d61 HX |
523 | void *crypto_alloc_tfm(const char *alg_name, |
524 | const struct crypto_type *frontend, u32 type, u32 mask) | |
7b0bac64 | 525 | { |
3f683d61 | 526 | void *tfm; |
7b0bac64 HX |
527 | int err; |
528 | ||
7b0bac64 HX |
529 | for (;;) { |
530 | struct crypto_alg *alg; | |
531 | ||
d06854f0 | 532 | alg = crypto_find_alg(alg_name, frontend, type, mask); |
7b0bac64 HX |
533 | if (IS_ERR(alg)) { |
534 | err = PTR_ERR(alg); | |
535 | goto err; | |
536 | } | |
537 | ||
538 | tfm = crypto_create_tfm(alg, frontend); | |
539 | if (!IS_ERR(tfm)) | |
540 | return tfm; | |
541 | ||
542 | crypto_mod_put(alg); | |
543 | err = PTR_ERR(tfm); | |
544 | ||
545 | err: | |
546 | if (err != -EAGAIN) | |
547 | break; | |
3fc89adb | 548 | if (fatal_signal_pending(current)) { |
7b0bac64 HX |
549 | err = -EINTR; |
550 | break; | |
551 | } | |
552 | } | |
553 | ||
554 | return ERR_PTR(err); | |
555 | } | |
556 | EXPORT_SYMBOL_GPL(crypto_alloc_tfm); | |
7b2cd92a | 557 | |
6d7d684d | 558 | /* |
7b2cd92a HX |
559 | * crypto_destroy_tfm - Free crypto transform |
560 | * @mem: Start of tfm slab | |
6d7d684d HX |
561 | * @tfm: Transform to free |
562 | * | |
7b2cd92a | 563 | * This function frees up the transform and any associated resources, |
6d7d684d HX |
564 | * then drops the refcount on the associated algorithm. |
565 | */ | |
7b2cd92a | 566 | void crypto_destroy_tfm(void *mem, struct crypto_tfm *tfm) |
1da177e4 | 567 | { |
a61cc448 | 568 | struct crypto_alg *alg; |
a61cc448 | 569 | |
7b2cd92a | 570 | if (unlikely(!mem)) |
a61cc448 JJ |
571 | return; |
572 | ||
573 | alg = tfm->__crt_alg; | |
1da177e4 | 574 | |
4a779486 | 575 | if (!tfm->exit && alg->cra_exit) |
c7fc0599 | 576 | alg->cra_exit(tfm); |
1da177e4 | 577 | crypto_exit_ops(tfm); |
72fa4919 | 578 | crypto_mod_put(alg); |
811d8f06 | 579 | kzfree(mem); |
1da177e4 | 580 | } |
7b2cd92a | 581 | EXPORT_SYMBOL_GPL(crypto_destroy_tfm); |
fce32d70 HX |
582 | |
583 | int crypto_has_alg(const char *name, u32 type, u32 mask) | |
584 | { | |
585 | int ret = 0; | |
586 | struct crypto_alg *alg = crypto_alg_mod_lookup(name, type, mask); | |
3d01a33b | 587 | |
fce32d70 HX |
588 | if (!IS_ERR(alg)) { |
589 | crypto_mod_put(alg); | |
590 | ret = 1; | |
591 | } | |
3d01a33b | 592 | |
fce32d70 HX |
593 | return ret; |
594 | } | |
595 | EXPORT_SYMBOL_GPL(crypto_has_alg); | |
c3715cb9 | 596 | |
ada69a16 GBY |
597 | void crypto_req_done(struct crypto_async_request *req, int err) |
598 | { | |
599 | struct crypto_wait *wait = req->data; | |
600 | ||
601 | if (err == -EINPROGRESS) | |
602 | return; | |
603 | ||
604 | wait->err = err; | |
605 | complete(&wait->completion); | |
606 | } | |
607 | EXPORT_SYMBOL_GPL(crypto_req_done); | |
608 | ||
c3715cb9 SS |
609 | MODULE_DESCRIPTION("Cryptographic core API"); |
610 | MODULE_LICENSE("GPL"); |