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Commit | Line | Data |
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7a7ffe65 HX |
1 | /* |
2 | * Symmetric key cipher operations. | |
3 | * | |
4 | * Generic encrypt/decrypt wrapper for ciphers, handles operations across | |
5 | * multiple page boundaries by using temporary blocks. In user context, | |
6 | * the kernel is given a chance to schedule us once per page. | |
7 | * | |
8 | * Copyright (c) 2015 Herbert Xu <herbert@gondor.apana.org.au> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify it | |
11 | * under the terms of the GNU General Public License as published by the Free | |
12 | * Software Foundation; either version 2 of the License, or (at your option) | |
13 | * any later version. | |
14 | * | |
15 | */ | |
16 | ||
b286d8b1 | 17 | #include <crypto/internal/aead.h> |
7a7ffe65 | 18 | #include <crypto/internal/skcipher.h> |
b286d8b1 | 19 | #include <crypto/scatterwalk.h> |
7a7ffe65 | 20 | #include <linux/bug.h> |
4e6c3df4 | 21 | #include <linux/cryptouser.h> |
b286d8b1 | 22 | #include <linux/list.h> |
7a7ffe65 | 23 | #include <linux/module.h> |
4e6c3df4 HX |
24 | #include <linux/rtnetlink.h> |
25 | #include <linux/seq_file.h> | |
26 | #include <net/netlink.h> | |
7a7ffe65 HX |
27 | |
28 | #include "internal.h" | |
29 | ||
b286d8b1 HX |
30 | enum { |
31 | SKCIPHER_WALK_PHYS = 1 << 0, | |
32 | SKCIPHER_WALK_SLOW = 1 << 1, | |
33 | SKCIPHER_WALK_COPY = 1 << 2, | |
34 | SKCIPHER_WALK_DIFF = 1 << 3, | |
35 | SKCIPHER_WALK_SLEEP = 1 << 4, | |
36 | }; | |
37 | ||
38 | struct skcipher_walk_buffer { | |
39 | struct list_head entry; | |
40 | struct scatter_walk dst; | |
41 | unsigned int len; | |
42 | u8 *data; | |
43 | u8 buffer[]; | |
44 | }; | |
45 | ||
46 | static int skcipher_walk_next(struct skcipher_walk *walk); | |
47 | ||
48 | static inline void skcipher_unmap(struct scatter_walk *walk, void *vaddr) | |
49 | { | |
50 | if (PageHighMem(scatterwalk_page(walk))) | |
51 | kunmap_atomic(vaddr); | |
52 | } | |
53 | ||
54 | static inline void *skcipher_map(struct scatter_walk *walk) | |
55 | { | |
56 | struct page *page = scatterwalk_page(walk); | |
57 | ||
58 | return (PageHighMem(page) ? kmap_atomic(page) : page_address(page)) + | |
59 | offset_in_page(walk->offset); | |
60 | } | |
61 | ||
62 | static inline void skcipher_map_src(struct skcipher_walk *walk) | |
63 | { | |
64 | walk->src.virt.addr = skcipher_map(&walk->in); | |
65 | } | |
66 | ||
67 | static inline void skcipher_map_dst(struct skcipher_walk *walk) | |
68 | { | |
69 | walk->dst.virt.addr = skcipher_map(&walk->out); | |
70 | } | |
71 | ||
72 | static inline void skcipher_unmap_src(struct skcipher_walk *walk) | |
73 | { | |
74 | skcipher_unmap(&walk->in, walk->src.virt.addr); | |
75 | } | |
76 | ||
77 | static inline void skcipher_unmap_dst(struct skcipher_walk *walk) | |
78 | { | |
79 | skcipher_unmap(&walk->out, walk->dst.virt.addr); | |
80 | } | |
81 | ||
82 | static inline gfp_t skcipher_walk_gfp(struct skcipher_walk *walk) | |
83 | { | |
84 | return walk->flags & SKCIPHER_WALK_SLEEP ? GFP_KERNEL : GFP_ATOMIC; | |
85 | } | |
86 | ||
87 | /* Get a spot of the specified length that does not straddle a page. | |
88 | * The caller needs to ensure that there is enough space for this operation. | |
89 | */ | |
90 | static inline u8 *skcipher_get_spot(u8 *start, unsigned int len) | |
91 | { | |
92 | u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK); | |
93 | ||
94 | return max(start, end_page); | |
95 | } | |
96 | ||
97 | static int skcipher_done_slow(struct skcipher_walk *walk, unsigned int bsize) | |
98 | { | |
99 | u8 *addr; | |
100 | ||
101 | addr = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1); | |
102 | addr = skcipher_get_spot(addr, bsize); | |
103 | scatterwalk_copychunks(addr, &walk->out, bsize, | |
104 | (walk->flags & SKCIPHER_WALK_PHYS) ? 2 : 1); | |
105 | return 0; | |
106 | } | |
107 | ||
108 | int skcipher_walk_done(struct skcipher_walk *walk, int err) | |
109 | { | |
110 | unsigned int n = walk->nbytes - err; | |
111 | unsigned int nbytes; | |
112 | ||
113 | nbytes = walk->total - n; | |
114 | ||
115 | if (unlikely(err < 0)) { | |
116 | nbytes = 0; | |
117 | n = 0; | |
118 | } else if (likely(!(walk->flags & (SKCIPHER_WALK_PHYS | | |
119 | SKCIPHER_WALK_SLOW | | |
120 | SKCIPHER_WALK_COPY | | |
121 | SKCIPHER_WALK_DIFF)))) { | |
122 | unmap_src: | |
123 | skcipher_unmap_src(walk); | |
124 | } else if (walk->flags & SKCIPHER_WALK_DIFF) { | |
125 | skcipher_unmap_dst(walk); | |
126 | goto unmap_src; | |
127 | } else if (walk->flags & SKCIPHER_WALK_COPY) { | |
128 | skcipher_map_dst(walk); | |
129 | memcpy(walk->dst.virt.addr, walk->page, n); | |
130 | skcipher_unmap_dst(walk); | |
131 | } else if (unlikely(walk->flags & SKCIPHER_WALK_SLOW)) { | |
132 | if (WARN_ON(err)) { | |
133 | err = -EINVAL; | |
134 | nbytes = 0; | |
135 | } else | |
136 | n = skcipher_done_slow(walk, n); | |
137 | } | |
138 | ||
139 | if (err > 0) | |
140 | err = 0; | |
141 | ||
142 | walk->total = nbytes; | |
143 | walk->nbytes = nbytes; | |
144 | ||
145 | scatterwalk_advance(&walk->in, n); | |
146 | scatterwalk_advance(&walk->out, n); | |
147 | scatterwalk_done(&walk->in, 0, nbytes); | |
148 | scatterwalk_done(&walk->out, 1, nbytes); | |
149 | ||
150 | if (nbytes) { | |
151 | crypto_yield(walk->flags & SKCIPHER_WALK_SLEEP ? | |
152 | CRYPTO_TFM_REQ_MAY_SLEEP : 0); | |
153 | return skcipher_walk_next(walk); | |
154 | } | |
155 | ||
156 | /* Short-circuit for the common/fast path. */ | |
157 | if (!((unsigned long)walk->buffer | (unsigned long)walk->page)) | |
158 | goto out; | |
159 | ||
160 | if (walk->flags & SKCIPHER_WALK_PHYS) | |
161 | goto out; | |
162 | ||
163 | if (walk->iv != walk->oiv) | |
164 | memcpy(walk->oiv, walk->iv, walk->ivsize); | |
165 | if (walk->buffer != walk->page) | |
166 | kfree(walk->buffer); | |
167 | if (walk->page) | |
168 | free_page((unsigned long)walk->page); | |
169 | ||
170 | out: | |
171 | return err; | |
172 | } | |
173 | EXPORT_SYMBOL_GPL(skcipher_walk_done); | |
174 | ||
175 | void skcipher_walk_complete(struct skcipher_walk *walk, int err) | |
176 | { | |
177 | struct skcipher_walk_buffer *p, *tmp; | |
178 | ||
179 | list_for_each_entry_safe(p, tmp, &walk->buffers, entry) { | |
180 | u8 *data; | |
181 | ||
182 | if (err) | |
183 | goto done; | |
184 | ||
185 | data = p->data; | |
186 | if (!data) { | |
187 | data = PTR_ALIGN(&p->buffer[0], walk->alignmask + 1); | |
188 | data = skcipher_get_spot(data, walk->chunksize); | |
189 | } | |
190 | ||
191 | scatterwalk_copychunks(data, &p->dst, p->len, 1); | |
192 | ||
193 | if (offset_in_page(p->data) + p->len + walk->chunksize > | |
194 | PAGE_SIZE) | |
195 | free_page((unsigned long)p->data); | |
196 | ||
197 | done: | |
198 | list_del(&p->entry); | |
199 | kfree(p); | |
200 | } | |
201 | ||
202 | if (!err && walk->iv != walk->oiv) | |
203 | memcpy(walk->oiv, walk->iv, walk->ivsize); | |
204 | if (walk->buffer != walk->page) | |
205 | kfree(walk->buffer); | |
206 | if (walk->page) | |
207 | free_page((unsigned long)walk->page); | |
208 | } | |
209 | EXPORT_SYMBOL_GPL(skcipher_walk_complete); | |
210 | ||
211 | static void skcipher_queue_write(struct skcipher_walk *walk, | |
212 | struct skcipher_walk_buffer *p) | |
213 | { | |
214 | p->dst = walk->out; | |
215 | list_add_tail(&p->entry, &walk->buffers); | |
216 | } | |
217 | ||
218 | static int skcipher_next_slow(struct skcipher_walk *walk, unsigned int bsize) | |
219 | { | |
220 | bool phys = walk->flags & SKCIPHER_WALK_PHYS; | |
221 | unsigned alignmask = walk->alignmask; | |
222 | struct skcipher_walk_buffer *p; | |
223 | unsigned a; | |
224 | unsigned n; | |
225 | u8 *buffer; | |
226 | void *v; | |
227 | ||
228 | if (!phys) { | |
18e615ad AB |
229 | if (!walk->buffer) |
230 | walk->buffer = walk->page; | |
231 | buffer = walk->buffer; | |
b286d8b1 HX |
232 | if (buffer) |
233 | goto ok; | |
234 | } | |
235 | ||
236 | /* Start with the minimum alignment of kmalloc. */ | |
237 | a = crypto_tfm_ctx_alignment() - 1; | |
238 | n = bsize; | |
239 | ||
240 | if (phys) { | |
241 | /* Calculate the minimum alignment of p->buffer. */ | |
242 | a &= (sizeof(*p) ^ (sizeof(*p) - 1)) >> 1; | |
243 | n += sizeof(*p); | |
244 | } | |
245 | ||
246 | /* Minimum size to align p->buffer by alignmask. */ | |
247 | n += alignmask & ~a; | |
248 | ||
249 | /* Minimum size to ensure p->buffer does not straddle a page. */ | |
250 | n += (bsize - 1) & ~(alignmask | a); | |
251 | ||
252 | v = kzalloc(n, skcipher_walk_gfp(walk)); | |
253 | if (!v) | |
254 | return skcipher_walk_done(walk, -ENOMEM); | |
255 | ||
256 | if (phys) { | |
257 | p = v; | |
258 | p->len = bsize; | |
259 | skcipher_queue_write(walk, p); | |
260 | buffer = p->buffer; | |
261 | } else { | |
262 | walk->buffer = v; | |
263 | buffer = v; | |
264 | } | |
265 | ||
266 | ok: | |
267 | walk->dst.virt.addr = PTR_ALIGN(buffer, alignmask + 1); | |
268 | walk->dst.virt.addr = skcipher_get_spot(walk->dst.virt.addr, bsize); | |
269 | walk->src.virt.addr = walk->dst.virt.addr; | |
270 | ||
271 | scatterwalk_copychunks(walk->src.virt.addr, &walk->in, bsize, 0); | |
272 | ||
273 | walk->nbytes = bsize; | |
274 | walk->flags |= SKCIPHER_WALK_SLOW; | |
275 | ||
276 | return 0; | |
277 | } | |
278 | ||
279 | static int skcipher_next_copy(struct skcipher_walk *walk) | |
280 | { | |
281 | struct skcipher_walk_buffer *p; | |
282 | u8 *tmp = walk->page; | |
283 | ||
284 | skcipher_map_src(walk); | |
285 | memcpy(tmp, walk->src.virt.addr, walk->nbytes); | |
286 | skcipher_unmap_src(walk); | |
287 | ||
288 | walk->src.virt.addr = tmp; | |
289 | walk->dst.virt.addr = tmp; | |
290 | ||
291 | if (!(walk->flags & SKCIPHER_WALK_PHYS)) | |
292 | return 0; | |
293 | ||
294 | p = kmalloc(sizeof(*p), skcipher_walk_gfp(walk)); | |
295 | if (!p) | |
296 | return -ENOMEM; | |
297 | ||
298 | p->data = walk->page; | |
299 | p->len = walk->nbytes; | |
300 | skcipher_queue_write(walk, p); | |
301 | ||
302 | if (offset_in_page(walk->page) + walk->nbytes + walk->chunksize > | |
303 | PAGE_SIZE) | |
304 | walk->page = NULL; | |
305 | else | |
306 | walk->page += walk->nbytes; | |
307 | ||
308 | return 0; | |
309 | } | |
310 | ||
311 | static int skcipher_next_fast(struct skcipher_walk *walk) | |
312 | { | |
313 | unsigned long diff; | |
314 | ||
315 | walk->src.phys.page = scatterwalk_page(&walk->in); | |
316 | walk->src.phys.offset = offset_in_page(walk->in.offset); | |
317 | walk->dst.phys.page = scatterwalk_page(&walk->out); | |
318 | walk->dst.phys.offset = offset_in_page(walk->out.offset); | |
319 | ||
320 | if (walk->flags & SKCIPHER_WALK_PHYS) | |
321 | return 0; | |
322 | ||
323 | diff = walk->src.phys.offset - walk->dst.phys.offset; | |
324 | diff |= walk->src.virt.page - walk->dst.virt.page; | |
325 | ||
326 | skcipher_map_src(walk); | |
327 | walk->dst.virt.addr = walk->src.virt.addr; | |
328 | ||
329 | if (diff) { | |
330 | walk->flags |= SKCIPHER_WALK_DIFF; | |
331 | skcipher_map_dst(walk); | |
332 | } | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
337 | static int skcipher_walk_next(struct skcipher_walk *walk) | |
338 | { | |
339 | unsigned int bsize; | |
340 | unsigned int n; | |
341 | int err; | |
342 | ||
343 | walk->flags &= ~(SKCIPHER_WALK_SLOW | SKCIPHER_WALK_COPY | | |
344 | SKCIPHER_WALK_DIFF); | |
345 | ||
346 | n = walk->total; | |
347 | bsize = min(walk->chunksize, max(n, walk->blocksize)); | |
348 | n = scatterwalk_clamp(&walk->in, n); | |
349 | n = scatterwalk_clamp(&walk->out, n); | |
350 | ||
351 | if (unlikely(n < bsize)) { | |
352 | if (unlikely(walk->total < walk->blocksize)) | |
353 | return skcipher_walk_done(walk, -EINVAL); | |
354 | ||
355 | slow_path: | |
356 | err = skcipher_next_slow(walk, bsize); | |
357 | goto set_phys_lowmem; | |
358 | } | |
359 | ||
360 | if (unlikely((walk->in.offset | walk->out.offset) & walk->alignmask)) { | |
361 | if (!walk->page) { | |
362 | gfp_t gfp = skcipher_walk_gfp(walk); | |
363 | ||
364 | walk->page = (void *)__get_free_page(gfp); | |
365 | if (!walk->page) | |
366 | goto slow_path; | |
367 | } | |
368 | ||
369 | walk->nbytes = min_t(unsigned, n, | |
370 | PAGE_SIZE - offset_in_page(walk->page)); | |
371 | walk->flags |= SKCIPHER_WALK_COPY; | |
372 | err = skcipher_next_copy(walk); | |
373 | goto set_phys_lowmem; | |
374 | } | |
375 | ||
376 | walk->nbytes = n; | |
377 | ||
378 | return skcipher_next_fast(walk); | |
379 | ||
380 | set_phys_lowmem: | |
381 | if (!err && (walk->flags & SKCIPHER_WALK_PHYS)) { | |
382 | walk->src.phys.page = virt_to_page(walk->src.virt.addr); | |
383 | walk->dst.phys.page = virt_to_page(walk->dst.virt.addr); | |
384 | walk->src.phys.offset &= PAGE_SIZE - 1; | |
385 | walk->dst.phys.offset &= PAGE_SIZE - 1; | |
386 | } | |
387 | return err; | |
388 | } | |
389 | EXPORT_SYMBOL_GPL(skcipher_walk_next); | |
390 | ||
391 | static int skcipher_copy_iv(struct skcipher_walk *walk) | |
392 | { | |
393 | unsigned a = crypto_tfm_ctx_alignment() - 1; | |
394 | unsigned alignmask = walk->alignmask; | |
395 | unsigned ivsize = walk->ivsize; | |
396 | unsigned bs = walk->chunksize; | |
397 | unsigned aligned_bs; | |
398 | unsigned size; | |
399 | u8 *iv; | |
400 | ||
401 | aligned_bs = ALIGN(bs, alignmask); | |
402 | ||
403 | /* Minimum size to align buffer by alignmask. */ | |
404 | size = alignmask & ~a; | |
405 | ||
406 | if (walk->flags & SKCIPHER_WALK_PHYS) | |
407 | size += ivsize; | |
408 | else { | |
409 | size += aligned_bs + ivsize; | |
410 | ||
411 | /* Minimum size to ensure buffer does not straddle a page. */ | |
412 | size += (bs - 1) & ~(alignmask | a); | |
413 | } | |
414 | ||
415 | walk->buffer = kmalloc(size, skcipher_walk_gfp(walk)); | |
416 | if (!walk->buffer) | |
417 | return -ENOMEM; | |
418 | ||
419 | iv = PTR_ALIGN(walk->buffer, alignmask + 1); | |
420 | iv = skcipher_get_spot(iv, bs) + aligned_bs; | |
421 | ||
422 | walk->iv = memcpy(iv, walk->iv, walk->ivsize); | |
423 | return 0; | |
424 | } | |
425 | ||
426 | static int skcipher_walk_first(struct skcipher_walk *walk) | |
427 | { | |
428 | walk->nbytes = 0; | |
429 | ||
430 | if (WARN_ON_ONCE(in_irq())) | |
431 | return -EDEADLK; | |
432 | ||
433 | if (unlikely(!walk->total)) | |
434 | return 0; | |
435 | ||
436 | walk->buffer = NULL; | |
437 | if (unlikely(((unsigned long)walk->iv & walk->alignmask))) { | |
438 | int err = skcipher_copy_iv(walk); | |
439 | if (err) | |
440 | return err; | |
441 | } | |
442 | ||
443 | walk->page = NULL; | |
444 | walk->nbytes = walk->total; | |
445 | ||
446 | return skcipher_walk_next(walk); | |
447 | } | |
448 | ||
449 | static int skcipher_walk_skcipher(struct skcipher_walk *walk, | |
450 | struct skcipher_request *req) | |
451 | { | |
452 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
453 | ||
454 | scatterwalk_start(&walk->in, req->src); | |
455 | scatterwalk_start(&walk->out, req->dst); | |
456 | ||
457 | walk->total = req->cryptlen; | |
458 | walk->iv = req->iv; | |
459 | walk->oiv = req->iv; | |
460 | ||
461 | walk->flags &= ~SKCIPHER_WALK_SLEEP; | |
462 | walk->flags |= req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? | |
463 | SKCIPHER_WALK_SLEEP : 0; | |
464 | ||
465 | walk->blocksize = crypto_skcipher_blocksize(tfm); | |
466 | walk->chunksize = crypto_skcipher_chunksize(tfm); | |
467 | walk->ivsize = crypto_skcipher_ivsize(tfm); | |
468 | walk->alignmask = crypto_skcipher_alignmask(tfm); | |
469 | ||
470 | return skcipher_walk_first(walk); | |
471 | } | |
472 | ||
473 | int skcipher_walk_virt(struct skcipher_walk *walk, | |
474 | struct skcipher_request *req, bool atomic) | |
475 | { | |
476 | int err; | |
477 | ||
478 | walk->flags &= ~SKCIPHER_WALK_PHYS; | |
479 | ||
480 | err = skcipher_walk_skcipher(walk, req); | |
481 | ||
482 | walk->flags &= atomic ? ~SKCIPHER_WALK_SLEEP : ~0; | |
483 | ||
484 | return err; | |
485 | } | |
486 | EXPORT_SYMBOL_GPL(skcipher_walk_virt); | |
487 | ||
488 | void skcipher_walk_atomise(struct skcipher_walk *walk) | |
489 | { | |
490 | walk->flags &= ~SKCIPHER_WALK_SLEEP; | |
491 | } | |
492 | EXPORT_SYMBOL_GPL(skcipher_walk_atomise); | |
493 | ||
494 | int skcipher_walk_async(struct skcipher_walk *walk, | |
495 | struct skcipher_request *req) | |
496 | { | |
497 | walk->flags |= SKCIPHER_WALK_PHYS; | |
498 | ||
499 | INIT_LIST_HEAD(&walk->buffers); | |
500 | ||
501 | return skcipher_walk_skcipher(walk, req); | |
502 | } | |
503 | EXPORT_SYMBOL_GPL(skcipher_walk_async); | |
504 | ||
34bc085c HX |
505 | static int skcipher_walk_aead_common(struct skcipher_walk *walk, |
506 | struct aead_request *req, bool atomic) | |
b286d8b1 HX |
507 | { |
508 | struct crypto_aead *tfm = crypto_aead_reqtfm(req); | |
509 | int err; | |
510 | ||
3cbf61fb AB |
511 | walk->flags &= ~SKCIPHER_WALK_PHYS; |
512 | ||
b286d8b1 HX |
513 | scatterwalk_start(&walk->in, req->src); |
514 | scatterwalk_start(&walk->out, req->dst); | |
515 | ||
516 | scatterwalk_copychunks(NULL, &walk->in, req->assoclen, 2); | |
517 | scatterwalk_copychunks(NULL, &walk->out, req->assoclen, 2); | |
518 | ||
b286d8b1 HX |
519 | walk->iv = req->iv; |
520 | walk->oiv = req->iv; | |
521 | ||
522 | if (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) | |
523 | walk->flags |= SKCIPHER_WALK_SLEEP; | |
524 | else | |
525 | walk->flags &= ~SKCIPHER_WALK_SLEEP; | |
526 | ||
527 | walk->blocksize = crypto_aead_blocksize(tfm); | |
528 | walk->chunksize = crypto_aead_chunksize(tfm); | |
529 | walk->ivsize = crypto_aead_ivsize(tfm); | |
530 | walk->alignmask = crypto_aead_alignmask(tfm); | |
531 | ||
532 | err = skcipher_walk_first(walk); | |
533 | ||
534 | if (atomic) | |
535 | walk->flags &= ~SKCIPHER_WALK_SLEEP; | |
536 | ||
537 | return err; | |
538 | } | |
34bc085c HX |
539 | |
540 | int skcipher_walk_aead(struct skcipher_walk *walk, struct aead_request *req, | |
541 | bool atomic) | |
542 | { | |
543 | walk->total = req->cryptlen; | |
544 | ||
545 | return skcipher_walk_aead_common(walk, req, atomic); | |
546 | } | |
b286d8b1 HX |
547 | EXPORT_SYMBOL_GPL(skcipher_walk_aead); |
548 | ||
34bc085c HX |
549 | int skcipher_walk_aead_encrypt(struct skcipher_walk *walk, |
550 | struct aead_request *req, bool atomic) | |
551 | { | |
552 | walk->total = req->cryptlen; | |
553 | ||
554 | return skcipher_walk_aead_common(walk, req, atomic); | |
555 | } | |
556 | EXPORT_SYMBOL_GPL(skcipher_walk_aead_encrypt); | |
557 | ||
558 | int skcipher_walk_aead_decrypt(struct skcipher_walk *walk, | |
559 | struct aead_request *req, bool atomic) | |
560 | { | |
561 | struct crypto_aead *tfm = crypto_aead_reqtfm(req); | |
562 | ||
563 | walk->total = req->cryptlen - crypto_aead_authsize(tfm); | |
564 | ||
565 | return skcipher_walk_aead_common(walk, req, atomic); | |
566 | } | |
567 | EXPORT_SYMBOL_GPL(skcipher_walk_aead_decrypt); | |
568 | ||
7a7ffe65 HX |
569 | static unsigned int crypto_skcipher_extsize(struct crypto_alg *alg) |
570 | { | |
571 | if (alg->cra_type == &crypto_blkcipher_type) | |
572 | return sizeof(struct crypto_blkcipher *); | |
573 | ||
4e6c3df4 HX |
574 | if (alg->cra_type == &crypto_ablkcipher_type || |
575 | alg->cra_type == &crypto_givcipher_type) | |
576 | return sizeof(struct crypto_ablkcipher *); | |
7a7ffe65 | 577 | |
4e6c3df4 | 578 | return crypto_alg_extsize(alg); |
7a7ffe65 HX |
579 | } |
580 | ||
581 | static int skcipher_setkey_blkcipher(struct crypto_skcipher *tfm, | |
582 | const u8 *key, unsigned int keylen) | |
583 | { | |
584 | struct crypto_blkcipher **ctx = crypto_skcipher_ctx(tfm); | |
585 | struct crypto_blkcipher *blkcipher = *ctx; | |
586 | int err; | |
587 | ||
588 | crypto_blkcipher_clear_flags(blkcipher, ~0); | |
589 | crypto_blkcipher_set_flags(blkcipher, crypto_skcipher_get_flags(tfm) & | |
590 | CRYPTO_TFM_REQ_MASK); | |
591 | err = crypto_blkcipher_setkey(blkcipher, key, keylen); | |
592 | crypto_skcipher_set_flags(tfm, crypto_blkcipher_get_flags(blkcipher) & | |
593 | CRYPTO_TFM_RES_MASK); | |
594 | ||
595 | return err; | |
596 | } | |
597 | ||
598 | static int skcipher_crypt_blkcipher(struct skcipher_request *req, | |
599 | int (*crypt)(struct blkcipher_desc *, | |
600 | struct scatterlist *, | |
601 | struct scatterlist *, | |
602 | unsigned int)) | |
603 | { | |
604 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
605 | struct crypto_blkcipher **ctx = crypto_skcipher_ctx(tfm); | |
606 | struct blkcipher_desc desc = { | |
607 | .tfm = *ctx, | |
608 | .info = req->iv, | |
609 | .flags = req->base.flags, | |
610 | }; | |
611 | ||
612 | ||
613 | return crypt(&desc, req->dst, req->src, req->cryptlen); | |
614 | } | |
615 | ||
616 | static int skcipher_encrypt_blkcipher(struct skcipher_request *req) | |
617 | { | |
618 | struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); | |
619 | struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher); | |
620 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; | |
621 | ||
622 | return skcipher_crypt_blkcipher(req, alg->encrypt); | |
623 | } | |
624 | ||
625 | static int skcipher_decrypt_blkcipher(struct skcipher_request *req) | |
626 | { | |
627 | struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); | |
628 | struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher); | |
629 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; | |
630 | ||
631 | return skcipher_crypt_blkcipher(req, alg->decrypt); | |
632 | } | |
633 | ||
634 | static void crypto_exit_skcipher_ops_blkcipher(struct crypto_tfm *tfm) | |
635 | { | |
636 | struct crypto_blkcipher **ctx = crypto_tfm_ctx(tfm); | |
637 | ||
638 | crypto_free_blkcipher(*ctx); | |
639 | } | |
640 | ||
ecdd6bed | 641 | static int crypto_init_skcipher_ops_blkcipher(struct crypto_tfm *tfm) |
7a7ffe65 HX |
642 | { |
643 | struct crypto_alg *calg = tfm->__crt_alg; | |
644 | struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm); | |
645 | struct crypto_blkcipher **ctx = crypto_tfm_ctx(tfm); | |
646 | struct crypto_blkcipher *blkcipher; | |
647 | struct crypto_tfm *btfm; | |
648 | ||
649 | if (!crypto_mod_get(calg)) | |
650 | return -EAGAIN; | |
651 | ||
652 | btfm = __crypto_alloc_tfm(calg, CRYPTO_ALG_TYPE_BLKCIPHER, | |
653 | CRYPTO_ALG_TYPE_MASK); | |
654 | if (IS_ERR(btfm)) { | |
655 | crypto_mod_put(calg); | |
656 | return PTR_ERR(btfm); | |
657 | } | |
658 | ||
659 | blkcipher = __crypto_blkcipher_cast(btfm); | |
660 | *ctx = blkcipher; | |
661 | tfm->exit = crypto_exit_skcipher_ops_blkcipher; | |
662 | ||
663 | skcipher->setkey = skcipher_setkey_blkcipher; | |
664 | skcipher->encrypt = skcipher_encrypt_blkcipher; | |
665 | skcipher->decrypt = skcipher_decrypt_blkcipher; | |
666 | ||
667 | skcipher->ivsize = crypto_blkcipher_ivsize(blkcipher); | |
973fb3fb | 668 | skcipher->keysize = calg->cra_blkcipher.max_keysize; |
7a7ffe65 HX |
669 | |
670 | return 0; | |
671 | } | |
672 | ||
673 | static int skcipher_setkey_ablkcipher(struct crypto_skcipher *tfm, | |
674 | const u8 *key, unsigned int keylen) | |
675 | { | |
676 | struct crypto_ablkcipher **ctx = crypto_skcipher_ctx(tfm); | |
677 | struct crypto_ablkcipher *ablkcipher = *ctx; | |
678 | int err; | |
679 | ||
680 | crypto_ablkcipher_clear_flags(ablkcipher, ~0); | |
681 | crypto_ablkcipher_set_flags(ablkcipher, | |
682 | crypto_skcipher_get_flags(tfm) & | |
683 | CRYPTO_TFM_REQ_MASK); | |
684 | err = crypto_ablkcipher_setkey(ablkcipher, key, keylen); | |
685 | crypto_skcipher_set_flags(tfm, | |
686 | crypto_ablkcipher_get_flags(ablkcipher) & | |
687 | CRYPTO_TFM_RES_MASK); | |
688 | ||
689 | return err; | |
690 | } | |
691 | ||
692 | static int skcipher_crypt_ablkcipher(struct skcipher_request *req, | |
693 | int (*crypt)(struct ablkcipher_request *)) | |
694 | { | |
695 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
696 | struct crypto_ablkcipher **ctx = crypto_skcipher_ctx(tfm); | |
697 | struct ablkcipher_request *subreq = skcipher_request_ctx(req); | |
698 | ||
699 | ablkcipher_request_set_tfm(subreq, *ctx); | |
700 | ablkcipher_request_set_callback(subreq, skcipher_request_flags(req), | |
701 | req->base.complete, req->base.data); | |
702 | ablkcipher_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, | |
703 | req->iv); | |
704 | ||
705 | return crypt(subreq); | |
706 | } | |
707 | ||
708 | static int skcipher_encrypt_ablkcipher(struct skcipher_request *req) | |
709 | { | |
710 | struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); | |
711 | struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher); | |
712 | struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher; | |
713 | ||
714 | return skcipher_crypt_ablkcipher(req, alg->encrypt); | |
715 | } | |
716 | ||
717 | static int skcipher_decrypt_ablkcipher(struct skcipher_request *req) | |
718 | { | |
719 | struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); | |
720 | struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher); | |
721 | struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher; | |
722 | ||
723 | return skcipher_crypt_ablkcipher(req, alg->decrypt); | |
724 | } | |
725 | ||
726 | static void crypto_exit_skcipher_ops_ablkcipher(struct crypto_tfm *tfm) | |
727 | { | |
728 | struct crypto_ablkcipher **ctx = crypto_tfm_ctx(tfm); | |
729 | ||
730 | crypto_free_ablkcipher(*ctx); | |
731 | } | |
732 | ||
ecdd6bed | 733 | static int crypto_init_skcipher_ops_ablkcipher(struct crypto_tfm *tfm) |
7a7ffe65 HX |
734 | { |
735 | struct crypto_alg *calg = tfm->__crt_alg; | |
736 | struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm); | |
737 | struct crypto_ablkcipher **ctx = crypto_tfm_ctx(tfm); | |
738 | struct crypto_ablkcipher *ablkcipher; | |
739 | struct crypto_tfm *abtfm; | |
740 | ||
741 | if (!crypto_mod_get(calg)) | |
742 | return -EAGAIN; | |
743 | ||
744 | abtfm = __crypto_alloc_tfm(calg, 0, 0); | |
745 | if (IS_ERR(abtfm)) { | |
746 | crypto_mod_put(calg); | |
747 | return PTR_ERR(abtfm); | |
748 | } | |
749 | ||
750 | ablkcipher = __crypto_ablkcipher_cast(abtfm); | |
751 | *ctx = ablkcipher; | |
752 | tfm->exit = crypto_exit_skcipher_ops_ablkcipher; | |
753 | ||
754 | skcipher->setkey = skcipher_setkey_ablkcipher; | |
755 | skcipher->encrypt = skcipher_encrypt_ablkcipher; | |
756 | skcipher->decrypt = skcipher_decrypt_ablkcipher; | |
757 | ||
758 | skcipher->ivsize = crypto_ablkcipher_ivsize(ablkcipher); | |
759 | skcipher->reqsize = crypto_ablkcipher_reqsize(ablkcipher) + | |
760 | sizeof(struct ablkcipher_request); | |
973fb3fb | 761 | skcipher->keysize = calg->cra_ablkcipher.max_keysize; |
7a7ffe65 HX |
762 | |
763 | return 0; | |
764 | } | |
765 | ||
4e6c3df4 HX |
766 | static void crypto_skcipher_exit_tfm(struct crypto_tfm *tfm) |
767 | { | |
768 | struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm); | |
769 | struct skcipher_alg *alg = crypto_skcipher_alg(skcipher); | |
770 | ||
771 | alg->exit(skcipher); | |
772 | } | |
773 | ||
7a7ffe65 HX |
774 | static int crypto_skcipher_init_tfm(struct crypto_tfm *tfm) |
775 | { | |
4e6c3df4 HX |
776 | struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm); |
777 | struct skcipher_alg *alg = crypto_skcipher_alg(skcipher); | |
778 | ||
7a7ffe65 HX |
779 | if (tfm->__crt_alg->cra_type == &crypto_blkcipher_type) |
780 | return crypto_init_skcipher_ops_blkcipher(tfm); | |
781 | ||
4e6c3df4 HX |
782 | if (tfm->__crt_alg->cra_type == &crypto_ablkcipher_type || |
783 | tfm->__crt_alg->cra_type == &crypto_givcipher_type) | |
784 | return crypto_init_skcipher_ops_ablkcipher(tfm); | |
785 | ||
786 | skcipher->setkey = alg->setkey; | |
787 | skcipher->encrypt = alg->encrypt; | |
788 | skcipher->decrypt = alg->decrypt; | |
789 | skcipher->ivsize = alg->ivsize; | |
790 | skcipher->keysize = alg->max_keysize; | |
791 | ||
792 | if (alg->exit) | |
793 | skcipher->base.exit = crypto_skcipher_exit_tfm; | |
7a7ffe65 | 794 | |
4e6c3df4 HX |
795 | if (alg->init) |
796 | return alg->init(skcipher); | |
797 | ||
798 | return 0; | |
799 | } | |
800 | ||
801 | static void crypto_skcipher_free_instance(struct crypto_instance *inst) | |
802 | { | |
803 | struct skcipher_instance *skcipher = | |
804 | container_of(inst, struct skcipher_instance, s.base); | |
805 | ||
806 | skcipher->free(skcipher); | |
807 | } | |
808 | ||
809 | static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg) | |
810 | __attribute__ ((unused)); | |
811 | static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg) | |
812 | { | |
813 | struct skcipher_alg *skcipher = container_of(alg, struct skcipher_alg, | |
814 | base); | |
815 | ||
816 | seq_printf(m, "type : skcipher\n"); | |
817 | seq_printf(m, "async : %s\n", | |
818 | alg->cra_flags & CRYPTO_ALG_ASYNC ? "yes" : "no"); | |
819 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
820 | seq_printf(m, "min keysize : %u\n", skcipher->min_keysize); | |
821 | seq_printf(m, "max keysize : %u\n", skcipher->max_keysize); | |
822 | seq_printf(m, "ivsize : %u\n", skcipher->ivsize); | |
823 | seq_printf(m, "chunksize : %u\n", skcipher->chunksize); | |
7a7ffe65 HX |
824 | } |
825 | ||
4e6c3df4 HX |
826 | #ifdef CONFIG_NET |
827 | static int crypto_skcipher_report(struct sk_buff *skb, struct crypto_alg *alg) | |
828 | { | |
829 | struct crypto_report_blkcipher rblkcipher; | |
830 | struct skcipher_alg *skcipher = container_of(alg, struct skcipher_alg, | |
831 | base); | |
832 | ||
833 | strncpy(rblkcipher.type, "skcipher", sizeof(rblkcipher.type)); | |
834 | strncpy(rblkcipher.geniv, "<none>", sizeof(rblkcipher.geniv)); | |
835 | ||
836 | rblkcipher.blocksize = alg->cra_blocksize; | |
837 | rblkcipher.min_keysize = skcipher->min_keysize; | |
838 | rblkcipher.max_keysize = skcipher->max_keysize; | |
839 | rblkcipher.ivsize = skcipher->ivsize; | |
840 | ||
841 | if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER, | |
842 | sizeof(struct crypto_report_blkcipher), &rblkcipher)) | |
843 | goto nla_put_failure; | |
844 | return 0; | |
845 | ||
846 | nla_put_failure: | |
847 | return -EMSGSIZE; | |
848 | } | |
849 | #else | |
850 | static int crypto_skcipher_report(struct sk_buff *skb, struct crypto_alg *alg) | |
851 | { | |
852 | return -ENOSYS; | |
853 | } | |
854 | #endif | |
855 | ||
7a7ffe65 HX |
856 | static const struct crypto_type crypto_skcipher_type2 = { |
857 | .extsize = crypto_skcipher_extsize, | |
858 | .init_tfm = crypto_skcipher_init_tfm, | |
4e6c3df4 HX |
859 | .free = crypto_skcipher_free_instance, |
860 | #ifdef CONFIG_PROC_FS | |
861 | .show = crypto_skcipher_show, | |
862 | #endif | |
863 | .report = crypto_skcipher_report, | |
7a7ffe65 HX |
864 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, |
865 | .maskset = CRYPTO_ALG_TYPE_BLKCIPHER_MASK, | |
4e6c3df4 | 866 | .type = CRYPTO_ALG_TYPE_SKCIPHER, |
7a7ffe65 HX |
867 | .tfmsize = offsetof(struct crypto_skcipher, base), |
868 | }; | |
869 | ||
3a01d0ee | 870 | int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, |
4e6c3df4 HX |
871 | const char *name, u32 type, u32 mask) |
872 | { | |
873 | spawn->base.frontend = &crypto_skcipher_type2; | |
874 | return crypto_grab_spawn(&spawn->base, name, type, mask); | |
875 | } | |
3a01d0ee | 876 | EXPORT_SYMBOL_GPL(crypto_grab_skcipher); |
4e6c3df4 | 877 | |
7a7ffe65 HX |
878 | struct crypto_skcipher *crypto_alloc_skcipher(const char *alg_name, |
879 | u32 type, u32 mask) | |
880 | { | |
881 | return crypto_alloc_tfm(alg_name, &crypto_skcipher_type2, type, mask); | |
882 | } | |
883 | EXPORT_SYMBOL_GPL(crypto_alloc_skcipher); | |
884 | ||
4e6c3df4 HX |
885 | int crypto_has_skcipher2(const char *alg_name, u32 type, u32 mask) |
886 | { | |
887 | return crypto_type_has_alg(alg_name, &crypto_skcipher_type2, | |
888 | type, mask); | |
889 | } | |
890 | EXPORT_SYMBOL_GPL(crypto_has_skcipher2); | |
891 | ||
892 | static int skcipher_prepare_alg(struct skcipher_alg *alg) | |
893 | { | |
894 | struct crypto_alg *base = &alg->base; | |
895 | ||
896 | if (alg->ivsize > PAGE_SIZE / 8 || alg->chunksize > PAGE_SIZE / 8) | |
897 | return -EINVAL; | |
898 | ||
899 | if (!alg->chunksize) | |
900 | alg->chunksize = base->cra_blocksize; | |
901 | ||
902 | base->cra_type = &crypto_skcipher_type2; | |
903 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; | |
904 | base->cra_flags |= CRYPTO_ALG_TYPE_SKCIPHER; | |
905 | ||
906 | return 0; | |
907 | } | |
908 | ||
909 | int crypto_register_skcipher(struct skcipher_alg *alg) | |
910 | { | |
911 | struct crypto_alg *base = &alg->base; | |
912 | int err; | |
913 | ||
914 | err = skcipher_prepare_alg(alg); | |
915 | if (err) | |
916 | return err; | |
917 | ||
918 | return crypto_register_alg(base); | |
919 | } | |
920 | EXPORT_SYMBOL_GPL(crypto_register_skcipher); | |
921 | ||
922 | void crypto_unregister_skcipher(struct skcipher_alg *alg) | |
923 | { | |
924 | crypto_unregister_alg(&alg->base); | |
925 | } | |
926 | EXPORT_SYMBOL_GPL(crypto_unregister_skcipher); | |
927 | ||
928 | int crypto_register_skciphers(struct skcipher_alg *algs, int count) | |
929 | { | |
930 | int i, ret; | |
931 | ||
932 | for (i = 0; i < count; i++) { | |
933 | ret = crypto_register_skcipher(&algs[i]); | |
934 | if (ret) | |
935 | goto err; | |
936 | } | |
937 | ||
938 | return 0; | |
939 | ||
940 | err: | |
941 | for (--i; i >= 0; --i) | |
942 | crypto_unregister_skcipher(&algs[i]); | |
943 | ||
944 | return ret; | |
945 | } | |
946 | EXPORT_SYMBOL_GPL(crypto_register_skciphers); | |
947 | ||
948 | void crypto_unregister_skciphers(struct skcipher_alg *algs, int count) | |
949 | { | |
950 | int i; | |
951 | ||
952 | for (i = count - 1; i >= 0; --i) | |
953 | crypto_unregister_skcipher(&algs[i]); | |
954 | } | |
955 | EXPORT_SYMBOL_GPL(crypto_unregister_skciphers); | |
956 | ||
957 | int skcipher_register_instance(struct crypto_template *tmpl, | |
958 | struct skcipher_instance *inst) | |
959 | { | |
960 | int err; | |
961 | ||
962 | err = skcipher_prepare_alg(&inst->alg); | |
963 | if (err) | |
964 | return err; | |
965 | ||
966 | return crypto_register_instance(tmpl, skcipher_crypto_instance(inst)); | |
967 | } | |
968 | EXPORT_SYMBOL_GPL(skcipher_register_instance); | |
969 | ||
7a7ffe65 HX |
970 | MODULE_LICENSE("GPL"); |
971 | MODULE_DESCRIPTION("Symmetric key cipher type"); |