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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/kernel.h> |
20 | #include <linux/rtnetlink.h> |
21 | #include <linux/sched.h> |
22 | #include <linux/slab.h> |
23 | #include <linux/seq_file.h> |
24 | #include <linux/cryptouser.h> |
25 | #include <net/netlink.h> |
26 | |
27 | #include <crypto/scatterwalk.h> |
28 | |
29 | #include "internal.h" |
30 | |
31 | struct ablkcipher_buffer { |
32 | struct list_head entry; |
33 | struct scatter_walk dst; |
34 | unsigned int len; |
35 | void *data; |
36 | }; |
37 | |
38 | enum { |
39 | ABLKCIPHER_WALK_SLOW = 1 << 0, |
40 | }; |
41 | |
42 | static inline void ablkcipher_buffer_write(struct ablkcipher_buffer *p) |
43 | { |
44 | scatterwalk_copychunks(p->data, &p->dst, p->len, 1); |
45 | } |
46 | |
47 | void __ablkcipher_walk_complete(struct ablkcipher_walk *walk) |
48 | { |
49 | struct ablkcipher_buffer *p, *tmp; |
50 | |
51 | list_for_each_entry_safe(p, tmp, &walk->buffers, entry) { |
52 | ablkcipher_buffer_write(p); |
53 | list_del(&p->entry); |
54 | kfree(p); |
55 | } |
56 | } |
57 | EXPORT_SYMBOL_GPL(__ablkcipher_walk_complete); |
58 | |
59 | static inline void ablkcipher_queue_write(struct ablkcipher_walk *walk, |
60 | struct ablkcipher_buffer *p) |
61 | { |
62 | p->dst = walk->out; |
63 | list_add_tail(&p->entry, &walk->buffers); |
64 | } |
65 | |
66 | /* Get a spot of the specified length that does not straddle a page. |
67 | * The caller needs to ensure that there is enough space for this operation. |
68 | */ |
69 | static inline u8 *ablkcipher_get_spot(u8 *start, unsigned int len) |
70 | { |
71 | u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK); |
72 | return max(start, end_page); |
73 | } |
74 | |
75 | static inline unsigned int ablkcipher_done_slow(struct ablkcipher_walk *walk, |
76 | unsigned int bsize) |
77 | { |
78 | unsigned int n = bsize; |
79 | |
80 | for (;;) { |
81 | unsigned int len_this_page = scatterwalk_pagelen(&walk->out); |
82 | |
83 | if (len_this_page > n) |
84 | len_this_page = n; |
85 | scatterwalk_advance(&walk->out, n); |
86 | if (n == len_this_page) |
87 | break; |
88 | n -= len_this_page; |
89 | scatterwalk_start(&walk->out, scatterwalk_sg_next(walk->out.sg)); |
90 | } |
91 | |
92 | return bsize; |
93 | } |
94 | |
95 | static inline unsigned int ablkcipher_done_fast(struct ablkcipher_walk *walk, |
96 | unsigned int n) |
97 | { |
98 | scatterwalk_advance(&walk->in, n); |
99 | scatterwalk_advance(&walk->out, n); |
100 | |
101 | return n; |
102 | } |
103 | |
104 | static int ablkcipher_walk_next(struct ablkcipher_request *req, |
105 | struct ablkcipher_walk *walk); |
106 | |
107 | int ablkcipher_walk_done(struct ablkcipher_request *req, |
108 | struct ablkcipher_walk *walk, int err) |
109 | { |
110 | struct crypto_tfm *tfm = req->base.tfm; |
111 | unsigned int nbytes = 0; |
112 | |
113 | if (likely(err >= 0)) { |
114 | unsigned int n = walk->nbytes - err; |
115 | |
116 | if (likely(!(walk->flags & ABLKCIPHER_WALK_SLOW))) |
117 | n = ablkcipher_done_fast(walk, n); |
118 | else if (WARN_ON(err)) { |
119 | err = -EINVAL; |
120 | goto err; |
121 | } else |
122 | n = ablkcipher_done_slow(walk, n); |
123 | |
124 | nbytes = walk->total - n; |
125 | err = 0; |
126 | } |
127 | |
128 | scatterwalk_done(&walk->in, 0, nbytes); |
129 | scatterwalk_done(&walk->out, 1, nbytes); |
130 | |
131 | err: |
132 | walk->total = nbytes; |
133 | walk->nbytes = nbytes; |
134 | |
135 | if (nbytes) { |
136 | crypto_yield(req->base.flags); |
137 | return ablkcipher_walk_next(req, walk); |
138 | } |
139 | |
140 | if (walk->iv != req->info) |
141 | memcpy(req->info, walk->iv, tfm->crt_ablkcipher.ivsize); |
142 | kfree(walk->iv_buffer); |
143 | |
144 | return err; |
145 | } |
146 | EXPORT_SYMBOL_GPL(ablkcipher_walk_done); |
147 | |
148 | static inline int ablkcipher_next_slow(struct ablkcipher_request *req, |
149 | struct ablkcipher_walk *walk, |
150 | unsigned int bsize, |
151 | unsigned int alignmask, |
152 | void **src_p, void **dst_p) |
153 | { |
154 | unsigned aligned_bsize = ALIGN(bsize, alignmask + 1); |
155 | struct ablkcipher_buffer *p; |
156 | void *src, *dst, *base; |
157 | unsigned int n; |
158 | |
159 | n = ALIGN(sizeof(struct ablkcipher_buffer), alignmask + 1); |
160 | n += (aligned_bsize * 3 - (alignmask + 1) + |
161 | (alignmask & ~(crypto_tfm_ctx_alignment() - 1))); |
162 | |
163 | p = kmalloc(n, GFP_ATOMIC); |
164 | if (!p) |
165 | return ablkcipher_walk_done(req, walk, -ENOMEM); |
166 | |
167 | base = p + 1; |
168 | |
169 | dst = (u8 *)ALIGN((unsigned long)base, alignmask + 1); |
170 | src = dst = ablkcipher_get_spot(dst, bsize); |
171 | |
172 | p->len = bsize; |
173 | p->data = dst; |
174 | |
175 | scatterwalk_copychunks(src, &walk->in, bsize, 0); |
176 | |
177 | ablkcipher_queue_write(walk, p); |
178 | |
179 | walk->nbytes = bsize; |
180 | walk->flags |= ABLKCIPHER_WALK_SLOW; |
181 | |
182 | *src_p = src; |
183 | *dst_p = dst; |
184 | |
185 | return 0; |
186 | } |
187 | |
188 | static inline int ablkcipher_copy_iv(struct ablkcipher_walk *walk, |
189 | struct crypto_tfm *tfm, |
190 | unsigned int alignmask) |
191 | { |
192 | unsigned bs = walk->blocksize; |
193 | unsigned int ivsize = tfm->crt_ablkcipher.ivsize; |
194 | unsigned aligned_bs = ALIGN(bs, alignmask + 1); |
195 | unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) - |
196 | (alignmask + 1); |
197 | u8 *iv; |
198 | |
199 | size += alignmask & ~(crypto_tfm_ctx_alignment() - 1); |
200 | walk->iv_buffer = kmalloc(size, GFP_ATOMIC); |
201 | if (!walk->iv_buffer) |
202 | return -ENOMEM; |
203 | |
204 | iv = (u8 *)ALIGN((unsigned long)walk->iv_buffer, alignmask + 1); |
205 | iv = ablkcipher_get_spot(iv, bs) + aligned_bs; |
206 | iv = ablkcipher_get_spot(iv, bs) + aligned_bs; |
207 | iv = ablkcipher_get_spot(iv, ivsize); |
208 | |
209 | walk->iv = memcpy(iv, walk->iv, ivsize); |
210 | return 0; |
211 | } |
212 | |
213 | static inline int ablkcipher_next_fast(struct ablkcipher_request *req, |
214 | struct ablkcipher_walk *walk) |
215 | { |
216 | walk->src.page = scatterwalk_page(&walk->in); |
217 | walk->src.offset = offset_in_page(walk->in.offset); |
218 | walk->dst.page = scatterwalk_page(&walk->out); |
219 | walk->dst.offset = offset_in_page(walk->out.offset); |
220 | |
221 | return 0; |
222 | } |
223 | |
224 | static int ablkcipher_walk_next(struct ablkcipher_request *req, |
225 | struct ablkcipher_walk *walk) |
226 | { |
227 | struct crypto_tfm *tfm = req->base.tfm; |
228 | unsigned int alignmask, bsize, n; |
229 | void *src, *dst; |
230 | int err; |
231 | |
232 | alignmask = crypto_tfm_alg_alignmask(tfm); |
233 | n = walk->total; |
234 | if (unlikely(n < crypto_tfm_alg_blocksize(tfm))) { |
235 | req->base.flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN; |
236 | return ablkcipher_walk_done(req, walk, -EINVAL); |
237 | } |
238 | |
239 | walk->flags &= ~ABLKCIPHER_WALK_SLOW; |
240 | src = dst = NULL; |
241 | |
242 | bsize = min(walk->blocksize, n); |
243 | n = scatterwalk_clamp(&walk->in, n); |
244 | n = scatterwalk_clamp(&walk->out, n); |
245 | |
246 | if (n < bsize || |
247 | !scatterwalk_aligned(&walk->in, alignmask) || |
248 | !scatterwalk_aligned(&walk->out, alignmask)) { |
249 | err = ablkcipher_next_slow(req, walk, bsize, alignmask, |
250 | &src, &dst); |
251 | goto set_phys_lowmem; |
252 | } |
253 | |
254 | walk->nbytes = n; |
255 | |
256 | return ablkcipher_next_fast(req, walk); |
257 | |
258 | set_phys_lowmem: |
259 | if (err >= 0) { |
260 | walk->src.page = virt_to_page(src); |
261 | walk->dst.page = virt_to_page(dst); |
262 | walk->src.offset = ((unsigned long)src & (PAGE_SIZE - 1)); |
263 | walk->dst.offset = ((unsigned long)dst & (PAGE_SIZE - 1)); |
264 | } |
265 | |
266 | return err; |
267 | } |
268 | |
269 | static int ablkcipher_walk_first(struct ablkcipher_request *req, |
270 | struct ablkcipher_walk *walk) |
271 | { |
272 | struct crypto_tfm *tfm = req->base.tfm; |
273 | unsigned int alignmask; |
274 | |
275 | alignmask = crypto_tfm_alg_alignmask(tfm); |
276 | if (WARN_ON_ONCE(in_irq())) |
277 | return -EDEADLK; |
278 | |
279 | walk->nbytes = walk->total; |
280 | if (unlikely(!walk->total)) |
281 | return 0; |
282 | |
283 | walk->iv_buffer = NULL; |
284 | walk->iv = req->info; |
285 | if (unlikely(((unsigned long)walk->iv & alignmask))) { |
286 | int err = ablkcipher_copy_iv(walk, tfm, alignmask); |
287 | if (err) |
288 | return err; |
289 | } |
290 | |
291 | scatterwalk_start(&walk->in, walk->in.sg); |
292 | scatterwalk_start(&walk->out, walk->out.sg); |
293 | |
294 | return ablkcipher_walk_next(req, walk); |
295 | } |
296 | |
297 | int ablkcipher_walk_phys(struct ablkcipher_request *req, |
298 | struct ablkcipher_walk *walk) |
299 | { |
300 | walk->blocksize = crypto_tfm_alg_blocksize(req->base.tfm); |
301 | return ablkcipher_walk_first(req, walk); |
302 | } |
303 | EXPORT_SYMBOL_GPL(ablkcipher_walk_phys); |
304 | |
305 | static int setkey_unaligned(struct crypto_ablkcipher *tfm, const u8 *key, |
306 | unsigned int keylen) |
307 | { |
308 | struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm); |
309 | unsigned long alignmask = crypto_ablkcipher_alignmask(tfm); |
310 | int ret; |
311 | u8 *buffer, *alignbuffer; |
312 | unsigned long absize; |
313 | |
314 | absize = keylen + alignmask; |
315 | buffer = kmalloc(absize, GFP_ATOMIC); |
316 | if (!buffer) |
317 | return -ENOMEM; |
318 | |
319 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); |
320 | memcpy(alignbuffer, key, keylen); |
321 | ret = cipher->setkey(tfm, alignbuffer, keylen); |
322 | memset(alignbuffer, 0, keylen); |
323 | kfree(buffer); |
324 | return ret; |
325 | } |
326 | |
327 | static int setkey(struct crypto_ablkcipher *tfm, const u8 *key, |
328 | unsigned int keylen) |
329 | { |
330 | struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm); |
331 | unsigned long alignmask = crypto_ablkcipher_alignmask(tfm); |
332 | |
333 | if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) { |
334 | crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); |
335 | return -EINVAL; |
336 | } |
337 | |
338 | if ((unsigned long)key & alignmask) |
339 | return setkey_unaligned(tfm, key, keylen); |
340 | |
341 | return cipher->setkey(tfm, key, keylen); |
342 | } |
343 | |
344 | static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type, |
345 | u32 mask) |
346 | { |
347 | return alg->cra_ctxsize; |
348 | } |
349 | |
350 | int skcipher_null_givencrypt(struct skcipher_givcrypt_request *req) |
351 | { |
352 | return crypto_ablkcipher_encrypt(&req->creq); |
353 | } |
354 | |
355 | int skcipher_null_givdecrypt(struct skcipher_givcrypt_request *req) |
356 | { |
357 | return crypto_ablkcipher_decrypt(&req->creq); |
358 | } |
359 | |
360 | static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type, |
361 | u32 mask) |
362 | { |
363 | struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher; |
364 | struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher; |
365 | |
366 | if (alg->ivsize > PAGE_SIZE / 8) |
367 | return -EINVAL; |
368 | |
369 | crt->setkey = setkey; |
370 | crt->encrypt = alg->encrypt; |
371 | crt->decrypt = alg->decrypt; |
372 | if (!alg->ivsize) { |
373 | crt->givencrypt = skcipher_null_givencrypt; |
374 | crt->givdecrypt = skcipher_null_givdecrypt; |
375 | } |
376 | crt->base = __crypto_ablkcipher_cast(tfm); |
377 | crt->ivsize = alg->ivsize; |
378 | |
379 | return 0; |
380 | } |
381 | |
382 | #ifdef CONFIG_NET |
383 | static int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg) |
384 | { |
385 | struct crypto_report_blkcipher rblkcipher; |
386 | |
387 | strncpy(rblkcipher.type, "ablkcipher", sizeof(rblkcipher.type)); |
388 | strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<default>", |
389 | sizeof(rblkcipher.geniv)); |
390 | |
391 | rblkcipher.blocksize = alg->cra_blocksize; |
392 | rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize; |
393 | rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize; |
394 | rblkcipher.ivsize = alg->cra_ablkcipher.ivsize; |
395 | |
396 | if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER, |
397 | sizeof(struct crypto_report_blkcipher), &rblkcipher)) |
398 | goto nla_put_failure; |
399 | return 0; |
400 | |
401 | nla_put_failure: |
402 | return -EMSGSIZE; |
403 | } |
404 | #else |
405 | static int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg) |
406 | { |
407 | return -ENOSYS; |
408 | } |
409 | #endif |
410 | |
411 | static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg) |
412 | __attribute__ ((unused)); |
413 | static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg) |
414 | { |
415 | struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher; |
416 | |
417 | seq_printf(m, "type : ablkcipher\n"); |
418 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? |
419 | "yes" : "no"); |
420 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); |
421 | seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize); |
422 | seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize); |
423 | seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize); |
424 | seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<default>"); |
425 | } |
426 | |
427 | const struct crypto_type crypto_ablkcipher_type = { |
428 | .ctxsize = crypto_ablkcipher_ctxsize, |
429 | .init = crypto_init_ablkcipher_ops, |
430 | #ifdef CONFIG_PROC_FS |
431 | .show = crypto_ablkcipher_show, |
432 | #endif |
433 | .report = crypto_ablkcipher_report, |
434 | }; |
435 | EXPORT_SYMBOL_GPL(crypto_ablkcipher_type); |
436 | |
437 | static int no_givdecrypt(struct skcipher_givcrypt_request *req) |
438 | { |
439 | return -ENOSYS; |
440 | } |
441 | |
442 | static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type, |
443 | u32 mask) |
444 | { |
445 | struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher; |
446 | struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher; |
447 | |
448 | if (alg->ivsize > PAGE_SIZE / 8) |
449 | return -EINVAL; |
450 | |
451 | crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ? |
452 | alg->setkey : setkey; |
453 | crt->encrypt = alg->encrypt; |
454 | crt->decrypt = alg->decrypt; |
455 | crt->givencrypt = alg->givencrypt; |
456 | crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt; |
457 | crt->base = __crypto_ablkcipher_cast(tfm); |
458 | crt->ivsize = alg->ivsize; |
459 | |
460 | return 0; |
461 | } |
462 | |
463 | #ifdef CONFIG_NET |
464 | static int crypto_givcipher_report(struct sk_buff *skb, struct crypto_alg *alg) |
465 | { |
466 | struct crypto_report_blkcipher rblkcipher; |
467 | |
468 | strncpy(rblkcipher.type, "givcipher", sizeof(rblkcipher.type)); |
469 | strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<built-in>", |
470 | sizeof(rblkcipher.geniv)); |
471 | |
472 | rblkcipher.blocksize = alg->cra_blocksize; |
473 | rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize; |
474 | rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize; |
475 | rblkcipher.ivsize = alg->cra_ablkcipher.ivsize; |
476 | |
477 | if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER, |
478 | sizeof(struct crypto_report_blkcipher), &rblkcipher)) |
479 | goto nla_put_failure; |
480 | return 0; |
481 | |
482 | nla_put_failure: |
483 | return -EMSGSIZE; |
484 | } |
485 | #else |
486 | static int crypto_givcipher_report(struct sk_buff *skb, struct crypto_alg *alg) |
487 | { |
488 | return -ENOSYS; |
489 | } |
490 | #endif |
491 | |
492 | static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg) |
493 | __attribute__ ((unused)); |
494 | static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg) |
495 | { |
496 | struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher; |
497 | |
498 | seq_printf(m, "type : givcipher\n"); |
499 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? |
500 | "yes" : "no"); |
501 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); |
502 | seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize); |
503 | seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize); |
504 | seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize); |
505 | seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<built-in>"); |
506 | } |
507 | |
508 | const struct crypto_type crypto_givcipher_type = { |
509 | .ctxsize = crypto_ablkcipher_ctxsize, |
510 | .init = crypto_init_givcipher_ops, |
511 | #ifdef CONFIG_PROC_FS |
512 | .show = crypto_givcipher_show, |
513 | #endif |
514 | .report = crypto_givcipher_report, |
515 | }; |
516 | EXPORT_SYMBOL_GPL(crypto_givcipher_type); |
517 | |
518 | const char *crypto_default_geniv(const struct crypto_alg *alg) |
519 | { |
520 | if (((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == |
521 | CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize : |
522 | alg->cra_ablkcipher.ivsize) != |
523 | alg->cra_blocksize) |
524 | return "chainiv"; |
525 | |
526 | return "eseqiv"; |
527 | } |
528 | |
529 | static int crypto_givcipher_default(struct crypto_alg *alg, u32 type, u32 mask) |
530 | { |
531 | struct rtattr *tb[3]; |
532 | struct { |
533 | struct rtattr attr; |
534 | struct crypto_attr_type data; |
535 | } ptype; |
536 | struct { |
537 | struct rtattr attr; |
538 | struct crypto_attr_alg data; |
539 | } palg; |
540 | struct crypto_template *tmpl; |
541 | struct crypto_instance *inst; |
542 | struct crypto_alg *larval; |
543 | const char *geniv; |
544 | int err; |
545 | |
546 | larval = crypto_larval_lookup(alg->cra_driver_name, |
547 | (type & ~CRYPTO_ALG_TYPE_MASK) | |
548 | CRYPTO_ALG_TYPE_GIVCIPHER, |
549 | mask | CRYPTO_ALG_TYPE_MASK); |
550 | err = PTR_ERR(larval); |
551 | if (IS_ERR(larval)) |
552 | goto out; |
553 | |
554 | err = -EAGAIN; |
555 | if (!crypto_is_larval(larval)) |
556 | goto drop_larval; |
557 | |
558 | ptype.attr.rta_len = sizeof(ptype); |
559 | ptype.attr.rta_type = CRYPTOA_TYPE; |
560 | ptype.data.type = type | CRYPTO_ALG_GENIV; |
561 | /* GENIV tells the template that we're making a default geniv. */ |
562 | ptype.data.mask = mask | CRYPTO_ALG_GENIV; |
563 | tb[0] = &ptype.attr; |
564 | |
565 | palg.attr.rta_len = sizeof(palg); |
566 | palg.attr.rta_type = CRYPTOA_ALG; |
567 | /* Must use the exact name to locate ourselves. */ |
568 | memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME); |
569 | tb[1] = &palg.attr; |
570 | |
571 | tb[2] = NULL; |
572 | |
573 | if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == |
574 | CRYPTO_ALG_TYPE_BLKCIPHER) |
575 | geniv = alg->cra_blkcipher.geniv; |
576 | else |
577 | geniv = alg->cra_ablkcipher.geniv; |
578 | |
579 | if (!geniv) |
580 | geniv = crypto_default_geniv(alg); |
581 | |
582 | tmpl = crypto_lookup_template(geniv); |
583 | err = -ENOENT; |
584 | if (!tmpl) |
585 | goto kill_larval; |
586 | |
587 | inst = tmpl->alloc(tb); |
588 | err = PTR_ERR(inst); |
589 | if (IS_ERR(inst)) |
590 | goto put_tmpl; |
591 | |
592 | if ((err = crypto_register_instance(tmpl, inst))) { |
593 | tmpl->free(inst); |
594 | goto put_tmpl; |
595 | } |
596 | |
597 | /* Redo the lookup to use the instance we just registered. */ |
598 | err = -EAGAIN; |
599 | |
600 | put_tmpl: |
601 | crypto_tmpl_put(tmpl); |
602 | kill_larval: |
603 | crypto_larval_kill(larval); |
604 | drop_larval: |
605 | crypto_mod_put(larval); |
606 | out: |
607 | crypto_mod_put(alg); |
608 | return err; |
609 | } |
610 | |
611 | struct crypto_alg *crypto_lookup_skcipher(const char *name, u32 type, u32 mask) |
612 | { |
613 | struct crypto_alg *alg; |
614 | |
615 | alg = crypto_alg_mod_lookup(name, type, mask); |
616 | if (IS_ERR(alg)) |
617 | return alg; |
618 | |
619 | if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == |
620 | CRYPTO_ALG_TYPE_GIVCIPHER) |
621 | return alg; |
622 | |
623 | if (!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == |
624 | CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize : |
625 | alg->cra_ablkcipher.ivsize)) |
626 | return alg; |
627 | |
628 | crypto_mod_put(alg); |
629 | alg = crypto_alg_mod_lookup(name, type | CRYPTO_ALG_TESTED, |
630 | mask & ~CRYPTO_ALG_TESTED); |
631 | if (IS_ERR(alg)) |
632 | return alg; |
633 | |
634 | if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == |
635 | CRYPTO_ALG_TYPE_GIVCIPHER) { |
636 | if ((alg->cra_flags ^ type ^ ~mask) & CRYPTO_ALG_TESTED) { |
637 | crypto_mod_put(alg); |
638 | alg = ERR_PTR(-ENOENT); |
639 | } |
640 | return alg; |
641 | } |
642 | |
643 | BUG_ON(!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == |
644 | CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize : |
645 | alg->cra_ablkcipher.ivsize)); |
646 | |
647 | return ERR_PTR(crypto_givcipher_default(alg, type, mask)); |
648 | } |
649 | EXPORT_SYMBOL_GPL(crypto_lookup_skcipher); |
650 | |
651 | int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name, |
652 | u32 type, u32 mask) |
653 | { |
654 | struct crypto_alg *alg; |
655 | int err; |
656 | |
657 | type = crypto_skcipher_type(type); |
658 | mask = crypto_skcipher_mask(mask); |
659 | |
660 | alg = crypto_lookup_skcipher(name, type, mask); |
661 | if (IS_ERR(alg)) |
662 | return PTR_ERR(alg); |
663 | |
664 | err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask); |
665 | crypto_mod_put(alg); |
666 | return err; |
667 | } |
668 | EXPORT_SYMBOL_GPL(crypto_grab_skcipher); |
669 | |
670 | struct crypto_ablkcipher *crypto_alloc_ablkcipher(const char *alg_name, |
671 | u32 type, u32 mask) |
672 | { |
673 | struct crypto_tfm *tfm; |
674 | int err; |
675 | |
676 | type = crypto_skcipher_type(type); |
677 | mask = crypto_skcipher_mask(mask); |
678 | |
679 | for (;;) { |
680 | struct crypto_alg *alg; |
681 | |
682 | alg = crypto_lookup_skcipher(alg_name, type, mask); |
683 | if (IS_ERR(alg)) { |
684 | err = PTR_ERR(alg); |
685 | goto err; |
686 | } |
687 | |
688 | tfm = __crypto_alloc_tfm(alg, type, mask); |
689 | if (!IS_ERR(tfm)) |
690 | return __crypto_ablkcipher_cast(tfm); |
691 | |
692 | crypto_mod_put(alg); |
693 | err = PTR_ERR(tfm); |
694 | |
695 | err: |
696 | if (err != -EAGAIN) |
697 | break; |
698 | if (signal_pending(current)) { |
699 | err = -EINTR; |
700 | break; |
701 | } |
702 | } |
703 | |
704 | return ERR_PTR(err); |
705 | } |
706 | EXPORT_SYMBOL_GPL(crypto_alloc_ablkcipher); |
707 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9