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1 | /* |
2 | * Asynchronous block chaining cipher operations. |
3 | * |
4 | * This is the asynchronous version of blkcipher.c indicating completion |
5 | * via a callback. |
6 | * |
7 | * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify it |
10 | * under the terms of the GNU General Public License as published by the Free |
11 | * Software Foundation; either version 2 of the License, or (at your option) |
12 | * any later version. |
13 | * |
14 | */ |
15 | |
16 | #include <crypto/internal/skcipher.h> |
17 | #include <linux/cpumask.h> |
18 | #include <linux/err.h> |
19 | #include <linux/init.h> |
20 | #include <linux/kernel.h> |
21 | #include <linux/module.h> |
22 | #include <linux/rtnetlink.h> |
23 | #include <linux/sched.h> |
24 | #include <linux/slab.h> |
25 | #include <linux/seq_file.h> |
26 | |
27 | #include <crypto/scatterwalk.h> |
28 | |
29 | #include "internal.h" |
30 | |
31 | static const char *skcipher_default_geniv __read_mostly; |
32 | |
33 | struct ablkcipher_buffer { |
34 | struct list_head entry; |
35 | struct scatter_walk dst; |
36 | unsigned int len; |
37 | void *data; |
38 | }; |
39 | |
40 | enum { |
41 | ABLKCIPHER_WALK_SLOW = 1 << 0, |
42 | }; |
43 | |
44 | static inline void ablkcipher_buffer_write(struct ablkcipher_buffer *p) |
45 | { |
46 | scatterwalk_copychunks(p->data, &p->dst, p->len, 1); |
47 | } |
48 | |
49 | void __ablkcipher_walk_complete(struct ablkcipher_walk *walk) |
50 | { |
51 | struct ablkcipher_buffer *p, *tmp; |
52 | |
53 | list_for_each_entry_safe(p, tmp, &walk->buffers, entry) { |
54 | ablkcipher_buffer_write(p); |
55 | list_del(&p->entry); |
56 | kfree(p); |
57 | } |
58 | } |
59 | EXPORT_SYMBOL_GPL(__ablkcipher_walk_complete); |
60 | |
61 | static inline void ablkcipher_queue_write(struct ablkcipher_walk *walk, |
62 | struct ablkcipher_buffer *p) |
63 | { |
64 | p->dst = walk->out; |
65 | list_add_tail(&p->entry, &walk->buffers); |
66 | } |
67 | |
68 | /* Get a spot of the specified length that does not straddle a page. |
69 | * The caller needs to ensure that there is enough space for this operation. |
70 | */ |
71 | static inline u8 *ablkcipher_get_spot(u8 *start, unsigned int len) |
72 | { |
73 | u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK); |
74 | return max(start, end_page); |
75 | } |
76 | |
77 | static inline unsigned int ablkcipher_done_slow(struct ablkcipher_walk *walk, |
78 | unsigned int bsize) |
79 | { |
80 | unsigned int n = bsize; |
81 | |
82 | for (;;) { |
83 | unsigned int len_this_page = scatterwalk_pagelen(&walk->out); |
84 | |
85 | if (len_this_page > n) |
86 | len_this_page = n; |
87 | scatterwalk_advance(&walk->out, n); |
88 | if (n == len_this_page) |
89 | break; |
90 | n -= len_this_page; |
91 | scatterwalk_start(&walk->out, scatterwalk_sg_next(walk->out.sg)); |
92 | } |
93 | |
94 | return bsize; |
95 | } |
96 | |
97 | static inline unsigned int ablkcipher_done_fast(struct ablkcipher_walk *walk, |
98 | unsigned int n) |
99 | { |
100 | scatterwalk_advance(&walk->in, n); |
101 | scatterwalk_advance(&walk->out, n); |
102 | |
103 | return n; |
104 | } |
105 | |
106 | static int ablkcipher_walk_next(struct ablkcipher_request *req, |
107 | struct ablkcipher_walk *walk); |
108 | |
109 | int ablkcipher_walk_done(struct ablkcipher_request *req, |
110 | struct ablkcipher_walk *walk, int err) |
111 | { |
112 | struct crypto_tfm *tfm = req->base.tfm; |
113 | unsigned int nbytes = 0; |
114 | |
115 | if (likely(err >= 0)) { |
116 | unsigned int n = walk->nbytes - err; |
117 | |
118 | if (likely(!(walk->flags & ABLKCIPHER_WALK_SLOW))) |
119 | n = ablkcipher_done_fast(walk, n); |
120 | else if (WARN_ON(err)) { |
121 | err = -EINVAL; |
122 | goto err; |
123 | } else |
124 | n = ablkcipher_done_slow(walk, n); |
125 | |
126 | nbytes = walk->total - n; |
127 | err = 0; |
128 | } |
129 | |
130 | scatterwalk_done(&walk->in, 0, nbytes); |
131 | scatterwalk_done(&walk->out, 1, nbytes); |
132 | |
133 | err: |
134 | walk->total = nbytes; |
135 | walk->nbytes = nbytes; |
136 | |
137 | if (nbytes) { |
138 | crypto_yield(req->base.flags); |
139 | return ablkcipher_walk_next(req, walk); |
140 | } |
141 | |
142 | if (walk->iv != req->info) |
143 | memcpy(req->info, walk->iv, tfm->crt_ablkcipher.ivsize); |
144 | kfree(walk->iv_buffer); |
145 | |
146 | return err; |
147 | } |
148 | EXPORT_SYMBOL_GPL(ablkcipher_walk_done); |
149 | |
150 | static inline int ablkcipher_next_slow(struct ablkcipher_request *req, |
151 | struct ablkcipher_walk *walk, |
152 | unsigned int bsize, |
153 | unsigned int alignmask, |
154 | void **src_p, void **dst_p) |
155 | { |
156 | unsigned aligned_bsize = ALIGN(bsize, alignmask + 1); |
157 | struct ablkcipher_buffer *p; |
158 | void *src, *dst, *base; |
159 | unsigned int n; |
160 | |
161 | n = ALIGN(sizeof(struct ablkcipher_buffer), alignmask + 1); |
162 | n += (aligned_bsize * 3 - (alignmask + 1) + |
163 | (alignmask & ~(crypto_tfm_ctx_alignment() - 1))); |
164 | |
165 | p = kmalloc(n, GFP_ATOMIC); |
166 | if (!p) |
167 | return ablkcipher_walk_done(req, walk, -ENOMEM); |
168 | |
169 | base = p + 1; |
170 | |
171 | dst = (u8 *)ALIGN((unsigned long)base, alignmask + 1); |
172 | src = dst = ablkcipher_get_spot(dst, bsize); |
173 | |
174 | p->len = bsize; |
175 | p->data = dst; |
176 | |
177 | scatterwalk_copychunks(src, &walk->in, bsize, 0); |
178 | |
179 | ablkcipher_queue_write(walk, p); |
180 | |
181 | walk->nbytes = bsize; |
182 | walk->flags |= ABLKCIPHER_WALK_SLOW; |
183 | |
184 | *src_p = src; |
185 | *dst_p = dst; |
186 | |
187 | return 0; |
188 | } |
189 | |
190 | static inline int ablkcipher_copy_iv(struct ablkcipher_walk *walk, |
191 | struct crypto_tfm *tfm, |
192 | unsigned int alignmask) |
193 | { |
194 | unsigned bs = walk->blocksize; |
195 | unsigned int ivsize = tfm->crt_ablkcipher.ivsize; |
196 | unsigned aligned_bs = ALIGN(bs, alignmask + 1); |
197 | unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) - |
198 | (alignmask + 1); |
199 | u8 *iv; |
200 | |
201 | size += alignmask & ~(crypto_tfm_ctx_alignment() - 1); |
202 | walk->iv_buffer = kmalloc(size, GFP_ATOMIC); |
203 | if (!walk->iv_buffer) |
204 | return -ENOMEM; |
205 | |
206 | iv = (u8 *)ALIGN((unsigned long)walk->iv_buffer, alignmask + 1); |
207 | iv = ablkcipher_get_spot(iv, bs) + aligned_bs; |
208 | iv = ablkcipher_get_spot(iv, bs) + aligned_bs; |
209 | iv = ablkcipher_get_spot(iv, ivsize); |
210 | |
211 | walk->iv = memcpy(iv, walk->iv, ivsize); |
212 | return 0; |
213 | } |
214 | |
215 | static inline int ablkcipher_next_fast(struct ablkcipher_request *req, |
216 | struct ablkcipher_walk *walk) |
217 | { |
218 | walk->src.page = scatterwalk_page(&walk->in); |
219 | walk->src.offset = offset_in_page(walk->in.offset); |
220 | walk->dst.page = scatterwalk_page(&walk->out); |
221 | walk->dst.offset = offset_in_page(walk->out.offset); |
222 | |
223 | return 0; |
224 | } |
225 | |
226 | static int ablkcipher_walk_next(struct ablkcipher_request *req, |
227 | struct ablkcipher_walk *walk) |
228 | { |
229 | struct crypto_tfm *tfm = req->base.tfm; |
230 | unsigned int alignmask, bsize, n; |
231 | void *src, *dst; |
232 | int err; |
233 | |
234 | alignmask = crypto_tfm_alg_alignmask(tfm); |
235 | n = walk->total; |
236 | if (unlikely(n < crypto_tfm_alg_blocksize(tfm))) { |
237 | req->base.flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN; |
238 | return ablkcipher_walk_done(req, walk, -EINVAL); |
239 | } |
240 | |
241 | walk->flags &= ~ABLKCIPHER_WALK_SLOW; |
242 | src = dst = NULL; |
243 | |
244 | bsize = min(walk->blocksize, n); |
245 | n = scatterwalk_clamp(&walk->in, n); |
246 | n = scatterwalk_clamp(&walk->out, n); |
247 | |
248 | if (n < bsize || |
249 | !scatterwalk_aligned(&walk->in, alignmask) || |
250 | !scatterwalk_aligned(&walk->out, alignmask)) { |
251 | err = ablkcipher_next_slow(req, walk, bsize, alignmask, |
252 | &src, &dst); |
253 | goto set_phys_lowmem; |
254 | } |
255 | |
256 | walk->nbytes = n; |
257 | |
258 | return ablkcipher_next_fast(req, walk); |
259 | |
260 | set_phys_lowmem: |
261 | if (err >= 0) { |
262 | walk->src.page = virt_to_page(src); |
263 | walk->dst.page = virt_to_page(dst); |
264 | walk->src.offset = ((unsigned long)src & (PAGE_SIZE - 1)); |
265 | walk->dst.offset = ((unsigned long)dst & (PAGE_SIZE - 1)); |
266 | } |
267 | |
268 | return err; |
269 | } |
270 | |
271 | static int ablkcipher_walk_first(struct ablkcipher_request *req, |
272 | struct ablkcipher_walk *walk) |
273 | { |
274 | struct crypto_tfm *tfm = req->base.tfm; |
275 | unsigned int alignmask; |
276 | |
277 | alignmask = crypto_tfm_alg_alignmask(tfm); |
278 | if (WARN_ON_ONCE(in_irq())) |
279 | return -EDEADLK; |
280 | |
281 | walk->nbytes = walk->total; |
282 | if (unlikely(!walk->total)) |
283 | return 0; |
284 | |
285 | walk->iv_buffer = NULL; |
286 | walk->iv = req->info; |
287 | if (unlikely(((unsigned long)walk->iv & alignmask))) { |
288 | int err = ablkcipher_copy_iv(walk, tfm, alignmask); |
289 | if (err) |
290 | return err; |
291 | } |
292 | |
293 | scatterwalk_start(&walk->in, walk->in.sg); |
294 | scatterwalk_start(&walk->out, walk->out.sg); |
295 | |
296 | return ablkcipher_walk_next(req, walk); |
297 | } |
298 | |
299 | int ablkcipher_walk_phys(struct ablkcipher_request *req, |
300 | struct ablkcipher_walk *walk) |
301 | { |
302 | walk->blocksize = crypto_tfm_alg_blocksize(req->base.tfm); |
303 | return ablkcipher_walk_first(req, walk); |
304 | } |
305 | EXPORT_SYMBOL_GPL(ablkcipher_walk_phys); |
306 | |
307 | static int setkey_unaligned(struct crypto_ablkcipher *tfm, const u8 *key, |
308 | unsigned int keylen) |
309 | { |
310 | struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm); |
311 | unsigned long alignmask = crypto_ablkcipher_alignmask(tfm); |
312 | int ret; |
313 | u8 *buffer, *alignbuffer; |
314 | unsigned long absize; |
315 | |
316 | absize = keylen + alignmask; |
317 | buffer = kmalloc(absize, GFP_ATOMIC); |
318 | if (!buffer) |
319 | return -ENOMEM; |
320 | |
321 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); |
322 | memcpy(alignbuffer, key, keylen); |
323 | ret = cipher->setkey(tfm, alignbuffer, keylen); |
324 | memset(alignbuffer, 0, keylen); |
325 | kfree(buffer); |
326 | return ret; |
327 | } |
328 | |
329 | static int setkey(struct crypto_ablkcipher *tfm, const u8 *key, |
330 | unsigned int keylen) |
331 | { |
332 | struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm); |
333 | unsigned long alignmask = crypto_ablkcipher_alignmask(tfm); |
334 | |
335 | if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) { |
336 | crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); |
337 | return -EINVAL; |
338 | } |
339 | |
340 | if ((unsigned long)key & alignmask) |
341 | return setkey_unaligned(tfm, key, keylen); |
342 | |
343 | return cipher->setkey(tfm, key, keylen); |
344 | } |
345 | |
346 | static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type, |
347 | u32 mask) |
348 | { |
349 | return alg->cra_ctxsize; |
350 | } |
351 | |
352 | int skcipher_null_givencrypt(struct skcipher_givcrypt_request *req) |
353 | { |
354 | return crypto_ablkcipher_encrypt(&req->creq); |
355 | } |
356 | |
357 | int skcipher_null_givdecrypt(struct skcipher_givcrypt_request *req) |
358 | { |
359 | return crypto_ablkcipher_decrypt(&req->creq); |
360 | } |
361 | |
362 | static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type, |
363 | u32 mask) |
364 | { |
365 | struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher; |
366 | struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher; |
367 | |
368 | if (alg->ivsize > PAGE_SIZE / 8) |
369 | return -EINVAL; |
370 | |
371 | crt->setkey = setkey; |
372 | crt->encrypt = alg->encrypt; |
373 | crt->decrypt = alg->decrypt; |
374 | if (!alg->ivsize) { |
375 | crt->givencrypt = skcipher_null_givencrypt; |
376 | crt->givdecrypt = skcipher_null_givdecrypt; |
377 | } |
378 | crt->base = __crypto_ablkcipher_cast(tfm); |
379 | crt->ivsize = alg->ivsize; |
380 | |
381 | return 0; |
382 | } |
383 | |
384 | static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg) |
385 | __attribute__ ((unused)); |
386 | static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg) |
387 | { |
388 | struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher; |
389 | |
390 | seq_printf(m, "type : ablkcipher\n"); |
391 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? |
392 | "yes" : "no"); |
393 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); |
394 | seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize); |
395 | seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize); |
396 | seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize); |
397 | seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<default>"); |
398 | } |
399 | |
400 | const struct crypto_type crypto_ablkcipher_type = { |
401 | .ctxsize = crypto_ablkcipher_ctxsize, |
402 | .init = crypto_init_ablkcipher_ops, |
403 | #ifdef CONFIG_PROC_FS |
404 | .show = crypto_ablkcipher_show, |
405 | #endif |
406 | }; |
407 | EXPORT_SYMBOL_GPL(crypto_ablkcipher_type); |
408 | |
409 | static int no_givdecrypt(struct skcipher_givcrypt_request *req) |
410 | { |
411 | return -ENOSYS; |
412 | } |
413 | |
414 | static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type, |
415 | u32 mask) |
416 | { |
417 | struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher; |
418 | struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher; |
419 | |
420 | if (alg->ivsize > PAGE_SIZE / 8) |
421 | return -EINVAL; |
422 | |
423 | crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ? |
424 | alg->setkey : setkey; |
425 | crt->encrypt = alg->encrypt; |
426 | crt->decrypt = alg->decrypt; |
427 | crt->givencrypt = alg->givencrypt; |
428 | crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt; |
429 | crt->base = __crypto_ablkcipher_cast(tfm); |
430 | crt->ivsize = alg->ivsize; |
431 | |
432 | return 0; |
433 | } |
434 | |
435 | static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg) |
436 | __attribute__ ((unused)); |
437 | static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg) |
438 | { |
439 | struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher; |
440 | |
441 | seq_printf(m, "type : givcipher\n"); |
442 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? |
443 | "yes" : "no"); |
444 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); |
445 | seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize); |
446 | seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize); |
447 | seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize); |
448 | seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<built-in>"); |
449 | } |
450 | |
451 | const struct crypto_type crypto_givcipher_type = { |
452 | .ctxsize = crypto_ablkcipher_ctxsize, |
453 | .init = crypto_init_givcipher_ops, |
454 | #ifdef CONFIG_PROC_FS |
455 | .show = crypto_givcipher_show, |
456 | #endif |
457 | }; |
458 | EXPORT_SYMBOL_GPL(crypto_givcipher_type); |
459 | |
460 | const char *crypto_default_geniv(const struct crypto_alg *alg) |
461 | { |
462 | if (((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == |
463 | CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize : |
464 | alg->cra_ablkcipher.ivsize) != |
465 | alg->cra_blocksize) |
466 | return "chainiv"; |
467 | |
468 | return alg->cra_flags & CRYPTO_ALG_ASYNC ? |
469 | "eseqiv" : skcipher_default_geniv; |
470 | } |
471 | |
472 | static int crypto_givcipher_default(struct crypto_alg *alg, u32 type, u32 mask) |
473 | { |
474 | struct rtattr *tb[3]; |
475 | struct { |
476 | struct rtattr attr; |
477 | struct crypto_attr_type data; |
478 | } ptype; |
479 | struct { |
480 | struct rtattr attr; |
481 | struct crypto_attr_alg data; |
482 | } palg; |
483 | struct crypto_template *tmpl; |
484 | struct crypto_instance *inst; |
485 | struct crypto_alg *larval; |
486 | const char *geniv; |
487 | int err; |
488 | |
489 | larval = crypto_larval_lookup(alg->cra_driver_name, |
490 | (type & ~CRYPTO_ALG_TYPE_MASK) | |
491 | CRYPTO_ALG_TYPE_GIVCIPHER, |
492 | mask | CRYPTO_ALG_TYPE_MASK); |
493 | err = PTR_ERR(larval); |
494 | if (IS_ERR(larval)) |
495 | goto out; |
496 | |
497 | err = -EAGAIN; |
498 | if (!crypto_is_larval(larval)) |
499 | goto drop_larval; |
500 | |
501 | ptype.attr.rta_len = sizeof(ptype); |
502 | ptype.attr.rta_type = CRYPTOA_TYPE; |
503 | ptype.data.type = type | CRYPTO_ALG_GENIV; |
504 | /* GENIV tells the template that we're making a default geniv. */ |
505 | ptype.data.mask = mask | CRYPTO_ALG_GENIV; |
506 | tb[0] = &ptype.attr; |
507 | |
508 | palg.attr.rta_len = sizeof(palg); |
509 | palg.attr.rta_type = CRYPTOA_ALG; |
510 | /* Must use the exact name to locate ourselves. */ |
511 | memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME); |
512 | tb[1] = &palg.attr; |
513 | |
514 | tb[2] = NULL; |
515 | |
516 | if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == |
517 | CRYPTO_ALG_TYPE_BLKCIPHER) |
518 | geniv = alg->cra_blkcipher.geniv; |
519 | else |
520 | geniv = alg->cra_ablkcipher.geniv; |
521 | |
522 | if (!geniv) |
523 | geniv = crypto_default_geniv(alg); |
524 | |
525 | tmpl = crypto_lookup_template(geniv); |
526 | err = -ENOENT; |
527 | if (!tmpl) |
528 | goto kill_larval; |
529 | |
530 | inst = tmpl->alloc(tb); |
531 | err = PTR_ERR(inst); |
532 | if (IS_ERR(inst)) |
533 | goto put_tmpl; |
534 | |
535 | if ((err = crypto_register_instance(tmpl, inst))) { |
536 | tmpl->free(inst); |
537 | goto put_tmpl; |
538 | } |
539 | |
540 | /* Redo the lookup to use the instance we just registered. */ |
541 | err = -EAGAIN; |
542 | |
543 | put_tmpl: |
544 | crypto_tmpl_put(tmpl); |
545 | kill_larval: |
546 | crypto_larval_kill(larval); |
547 | drop_larval: |
548 | crypto_mod_put(larval); |
549 | out: |
550 | crypto_mod_put(alg); |
551 | return err; |
552 | } |
553 | |
554 | static struct crypto_alg *crypto_lookup_skcipher(const char *name, u32 type, |
555 | u32 mask) |
556 | { |
557 | struct crypto_alg *alg; |
558 | |
559 | alg = crypto_alg_mod_lookup(name, type, mask); |
560 | if (IS_ERR(alg)) |
561 | return alg; |
562 | |
563 | if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == |
564 | CRYPTO_ALG_TYPE_GIVCIPHER) |
565 | return alg; |
566 | |
567 | if (!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == |
568 | CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize : |
569 | alg->cra_ablkcipher.ivsize)) |
570 | return alg; |
571 | |
572 | crypto_mod_put(alg); |
573 | alg = crypto_alg_mod_lookup(name, type | CRYPTO_ALG_TESTED, |
574 | mask & ~CRYPTO_ALG_TESTED); |
575 | if (IS_ERR(alg)) |
576 | return alg; |
577 | |
578 | if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == |
579 | CRYPTO_ALG_TYPE_GIVCIPHER) { |
580 | if ((alg->cra_flags ^ type ^ ~mask) & CRYPTO_ALG_TESTED) { |
581 | crypto_mod_put(alg); |
582 | alg = ERR_PTR(-ENOENT); |
583 | } |
584 | return alg; |
585 | } |
586 | |
587 | BUG_ON(!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == |
588 | CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize : |
589 | alg->cra_ablkcipher.ivsize)); |
590 | |
591 | return ERR_PTR(crypto_givcipher_default(alg, type, mask)); |
592 | } |
593 | |
594 | int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name, |
595 | u32 type, u32 mask) |
596 | { |
597 | struct crypto_alg *alg; |
598 | int err; |
599 | |
600 | type = crypto_skcipher_type(type); |
601 | mask = crypto_skcipher_mask(mask); |
602 | |
603 | alg = crypto_lookup_skcipher(name, type, mask); |
604 | if (IS_ERR(alg)) |
605 | return PTR_ERR(alg); |
606 | |
607 | err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask); |
608 | crypto_mod_put(alg); |
609 | return err; |
610 | } |
611 | EXPORT_SYMBOL_GPL(crypto_grab_skcipher); |
612 | |
613 | struct crypto_ablkcipher *crypto_alloc_ablkcipher(const char *alg_name, |
614 | u32 type, u32 mask) |
615 | { |
616 | struct crypto_tfm *tfm; |
617 | int err; |
618 | |
619 | type = crypto_skcipher_type(type); |
620 | mask = crypto_skcipher_mask(mask); |
621 | |
622 | for (;;) { |
623 | struct crypto_alg *alg; |
624 | |
625 | alg = crypto_lookup_skcipher(alg_name, type, mask); |
626 | if (IS_ERR(alg)) { |
627 | err = PTR_ERR(alg); |
628 | goto err; |
629 | } |
630 | |
631 | tfm = __crypto_alloc_tfm(alg, type, mask); |
632 | if (!IS_ERR(tfm)) |
633 | return __crypto_ablkcipher_cast(tfm); |
634 | |
635 | crypto_mod_put(alg); |
636 | err = PTR_ERR(tfm); |
637 | |
638 | err: |
639 | if (err != -EAGAIN) |
640 | break; |
641 | if (signal_pending(current)) { |
642 | err = -EINTR; |
643 | break; |
644 | } |
645 | } |
646 | |
647 | return ERR_PTR(err); |
648 | } |
649 | EXPORT_SYMBOL_GPL(crypto_alloc_ablkcipher); |
650 | |
651 | static int __init skcipher_module_init(void) |
652 | { |
653 | skcipher_default_geniv = num_possible_cpus() > 1 ? |
654 | "eseqiv" : "chainiv"; |
655 | return 0; |
656 | } |
657 | |
658 | static void skcipher_module_exit(void) |
659 | { |
660 | } |
661 | |
662 | module_init(skcipher_module_init); |
663 | module_exit(skcipher_module_exit); |
664 |
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od-2011-09-04
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v2.6.34-rc5
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