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Commit | Line | Data |
---|---|---|
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> |
d8c34b94 | 22 | #include <linux/compiler.h> |
b286d8b1 | 23 | #include <linux/list.h> |
7a7ffe65 | 24 | #include <linux/module.h> |
4e6c3df4 HX |
25 | #include <linux/rtnetlink.h> |
26 | #include <linux/seq_file.h> | |
27 | #include <net/netlink.h> | |
7a7ffe65 HX |
28 | |
29 | #include "internal.h" | |
30 | ||
b286d8b1 HX |
31 | enum { |
32 | SKCIPHER_WALK_PHYS = 1 << 0, | |
33 | SKCIPHER_WALK_SLOW = 1 << 1, | |
34 | SKCIPHER_WALK_COPY = 1 << 2, | |
35 | SKCIPHER_WALK_DIFF = 1 << 3, | |
36 | SKCIPHER_WALK_SLEEP = 1 << 4, | |
37 | }; | |
38 | ||
39 | struct skcipher_walk_buffer { | |
40 | struct list_head entry; | |
41 | struct scatter_walk dst; | |
42 | unsigned int len; | |
43 | u8 *data; | |
44 | u8 buffer[]; | |
45 | }; | |
46 | ||
47 | static int skcipher_walk_next(struct skcipher_walk *walk); | |
48 | ||
49 | static inline void skcipher_unmap(struct scatter_walk *walk, void *vaddr) | |
50 | { | |
51 | if (PageHighMem(scatterwalk_page(walk))) | |
52 | kunmap_atomic(vaddr); | |
53 | } | |
54 | ||
55 | static inline void *skcipher_map(struct scatter_walk *walk) | |
56 | { | |
57 | struct page *page = scatterwalk_page(walk); | |
58 | ||
59 | return (PageHighMem(page) ? kmap_atomic(page) : page_address(page)) + | |
60 | offset_in_page(walk->offset); | |
61 | } | |
62 | ||
63 | static inline void skcipher_map_src(struct skcipher_walk *walk) | |
64 | { | |
65 | walk->src.virt.addr = skcipher_map(&walk->in); | |
66 | } | |
67 | ||
68 | static inline void skcipher_map_dst(struct skcipher_walk *walk) | |
69 | { | |
70 | walk->dst.virt.addr = skcipher_map(&walk->out); | |
71 | } | |
72 | ||
73 | static inline void skcipher_unmap_src(struct skcipher_walk *walk) | |
74 | { | |
75 | skcipher_unmap(&walk->in, walk->src.virt.addr); | |
76 | } | |
77 | ||
78 | static inline void skcipher_unmap_dst(struct skcipher_walk *walk) | |
79 | { | |
80 | skcipher_unmap(&walk->out, walk->dst.virt.addr); | |
81 | } | |
82 | ||
83 | static inline gfp_t skcipher_walk_gfp(struct skcipher_walk *walk) | |
84 | { | |
85 | return walk->flags & SKCIPHER_WALK_SLEEP ? GFP_KERNEL : GFP_ATOMIC; | |
86 | } | |
87 | ||
88 | /* Get a spot of the specified length that does not straddle a page. | |
89 | * The caller needs to ensure that there is enough space for this operation. | |
90 | */ | |
91 | static inline u8 *skcipher_get_spot(u8 *start, unsigned int len) | |
92 | { | |
93 | u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK); | |
94 | ||
95 | return max(start, end_page); | |
96 | } | |
97 | ||
d7c79ef0 | 98 | static void skcipher_done_slow(struct skcipher_walk *walk, unsigned int bsize) |
b286d8b1 HX |
99 | { |
100 | u8 *addr; | |
101 | ||
102 | addr = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1); | |
103 | addr = skcipher_get_spot(addr, bsize); | |
104 | scatterwalk_copychunks(addr, &walk->out, bsize, | |
105 | (walk->flags & SKCIPHER_WALK_PHYS) ? 2 : 1); | |
b286d8b1 HX |
106 | } |
107 | ||
108 | int skcipher_walk_done(struct skcipher_walk *walk, int err) | |
109 | { | |
d7c79ef0 EB |
110 | unsigned int n; /* bytes processed */ |
111 | bool more; | |
112 | ||
113 | if (unlikely(err < 0)) | |
114 | goto finish; | |
115 | ||
116 | n = walk->nbytes - err; | |
117 | walk->total -= n; | |
118 | more = (walk->total != 0); | |
119 | ||
120 | if (likely(!(walk->flags & (SKCIPHER_WALK_PHYS | | |
121 | SKCIPHER_WALK_SLOW | | |
122 | SKCIPHER_WALK_COPY | | |
123 | SKCIPHER_WALK_DIFF)))) { | |
b286d8b1 HX |
124 | unmap_src: |
125 | skcipher_unmap_src(walk); | |
126 | } else if (walk->flags & SKCIPHER_WALK_DIFF) { | |
127 | skcipher_unmap_dst(walk); | |
128 | goto unmap_src; | |
129 | } else if (walk->flags & SKCIPHER_WALK_COPY) { | |
130 | skcipher_map_dst(walk); | |
131 | memcpy(walk->dst.virt.addr, walk->page, n); | |
132 | skcipher_unmap_dst(walk); | |
133 | } else if (unlikely(walk->flags & SKCIPHER_WALK_SLOW)) { | |
134 | if (WARN_ON(err)) { | |
d7c79ef0 | 135 | /* unexpected case; didn't process all bytes */ |
b286d8b1 | 136 | err = -EINVAL; |
d7c79ef0 EB |
137 | goto finish; |
138 | } | |
139 | skcipher_done_slow(walk, n); | |
140 | goto already_advanced; | |
b286d8b1 HX |
141 | } |
142 | ||
b286d8b1 HX |
143 | scatterwalk_advance(&walk->in, n); |
144 | scatterwalk_advance(&walk->out, n); | |
d7c79ef0 EB |
145 | already_advanced: |
146 | scatterwalk_done(&walk->in, 0, more); | |
147 | scatterwalk_done(&walk->out, 1, more); | |
b286d8b1 | 148 | |
d7c79ef0 | 149 | if (more) { |
b286d8b1 HX |
150 | crypto_yield(walk->flags & SKCIPHER_WALK_SLEEP ? |
151 | CRYPTO_TFM_REQ_MAY_SLEEP : 0); | |
152 | return skcipher_walk_next(walk); | |
153 | } | |
d7c79ef0 EB |
154 | err = 0; |
155 | finish: | |
156 | walk->nbytes = 0; | |
b286d8b1 HX |
157 | |
158 | /* Short-circuit for the common/fast path. */ | |
159 | if (!((unsigned long)walk->buffer | (unsigned long)walk->page)) | |
160 | goto out; | |
161 | ||
162 | if (walk->flags & SKCIPHER_WALK_PHYS) | |
163 | goto out; | |
164 | ||
165 | if (walk->iv != walk->oiv) | |
166 | memcpy(walk->oiv, walk->iv, walk->ivsize); | |
167 | if (walk->buffer != walk->page) | |
168 | kfree(walk->buffer); | |
169 | if (walk->page) | |
170 | free_page((unsigned long)walk->page); | |
171 | ||
172 | out: | |
173 | return err; | |
174 | } | |
175 | EXPORT_SYMBOL_GPL(skcipher_walk_done); | |
176 | ||
177 | void skcipher_walk_complete(struct skcipher_walk *walk, int err) | |
178 | { | |
179 | struct skcipher_walk_buffer *p, *tmp; | |
180 | ||
181 | list_for_each_entry_safe(p, tmp, &walk->buffers, entry) { | |
182 | u8 *data; | |
183 | ||
184 | if (err) | |
185 | goto done; | |
186 | ||
187 | data = p->data; | |
188 | if (!data) { | |
189 | data = PTR_ALIGN(&p->buffer[0], walk->alignmask + 1); | |
c821f6ab | 190 | data = skcipher_get_spot(data, walk->stride); |
b286d8b1 HX |
191 | } |
192 | ||
193 | scatterwalk_copychunks(data, &p->dst, p->len, 1); | |
194 | ||
c821f6ab | 195 | if (offset_in_page(p->data) + p->len + walk->stride > |
b286d8b1 HX |
196 | PAGE_SIZE) |
197 | free_page((unsigned long)p->data); | |
198 | ||
199 | done: | |
200 | list_del(&p->entry); | |
201 | kfree(p); | |
202 | } | |
203 | ||
204 | if (!err && walk->iv != walk->oiv) | |
205 | memcpy(walk->oiv, walk->iv, walk->ivsize); | |
206 | if (walk->buffer != walk->page) | |
207 | kfree(walk->buffer); | |
208 | if (walk->page) | |
209 | free_page((unsigned long)walk->page); | |
210 | } | |
211 | EXPORT_SYMBOL_GPL(skcipher_walk_complete); | |
212 | ||
213 | static void skcipher_queue_write(struct skcipher_walk *walk, | |
214 | struct skcipher_walk_buffer *p) | |
215 | { | |
216 | p->dst = walk->out; | |
217 | list_add_tail(&p->entry, &walk->buffers); | |
218 | } | |
219 | ||
220 | static int skcipher_next_slow(struct skcipher_walk *walk, unsigned int bsize) | |
221 | { | |
222 | bool phys = walk->flags & SKCIPHER_WALK_PHYS; | |
223 | unsigned alignmask = walk->alignmask; | |
224 | struct skcipher_walk_buffer *p; | |
225 | unsigned a; | |
226 | unsigned n; | |
227 | u8 *buffer; | |
228 | void *v; | |
229 | ||
230 | if (!phys) { | |
18e615ad AB |
231 | if (!walk->buffer) |
232 | walk->buffer = walk->page; | |
233 | buffer = walk->buffer; | |
b286d8b1 HX |
234 | if (buffer) |
235 | goto ok; | |
236 | } | |
237 | ||
238 | /* Start with the minimum alignment of kmalloc. */ | |
239 | a = crypto_tfm_ctx_alignment() - 1; | |
240 | n = bsize; | |
241 | ||
242 | if (phys) { | |
243 | /* Calculate the minimum alignment of p->buffer. */ | |
244 | a &= (sizeof(*p) ^ (sizeof(*p) - 1)) >> 1; | |
245 | n += sizeof(*p); | |
246 | } | |
247 | ||
248 | /* Minimum size to align p->buffer by alignmask. */ | |
249 | n += alignmask & ~a; | |
250 | ||
251 | /* Minimum size to ensure p->buffer does not straddle a page. */ | |
252 | n += (bsize - 1) & ~(alignmask | a); | |
253 | ||
254 | v = kzalloc(n, skcipher_walk_gfp(walk)); | |
255 | if (!v) | |
256 | return skcipher_walk_done(walk, -ENOMEM); | |
257 | ||
258 | if (phys) { | |
259 | p = v; | |
260 | p->len = bsize; | |
261 | skcipher_queue_write(walk, p); | |
262 | buffer = p->buffer; | |
263 | } else { | |
264 | walk->buffer = v; | |
265 | buffer = v; | |
266 | } | |
267 | ||
268 | ok: | |
269 | walk->dst.virt.addr = PTR_ALIGN(buffer, alignmask + 1); | |
270 | walk->dst.virt.addr = skcipher_get_spot(walk->dst.virt.addr, bsize); | |
271 | walk->src.virt.addr = walk->dst.virt.addr; | |
272 | ||
273 | scatterwalk_copychunks(walk->src.virt.addr, &walk->in, bsize, 0); | |
274 | ||
275 | walk->nbytes = bsize; | |
276 | walk->flags |= SKCIPHER_WALK_SLOW; | |
277 | ||
278 | return 0; | |
279 | } | |
280 | ||
281 | static int skcipher_next_copy(struct skcipher_walk *walk) | |
282 | { | |
283 | struct skcipher_walk_buffer *p; | |
284 | u8 *tmp = walk->page; | |
285 | ||
286 | skcipher_map_src(walk); | |
287 | memcpy(tmp, walk->src.virt.addr, walk->nbytes); | |
288 | skcipher_unmap_src(walk); | |
289 | ||
290 | walk->src.virt.addr = tmp; | |
291 | walk->dst.virt.addr = tmp; | |
292 | ||
293 | if (!(walk->flags & SKCIPHER_WALK_PHYS)) | |
294 | return 0; | |
295 | ||
296 | p = kmalloc(sizeof(*p), skcipher_walk_gfp(walk)); | |
297 | if (!p) | |
298 | return -ENOMEM; | |
299 | ||
300 | p->data = walk->page; | |
301 | p->len = walk->nbytes; | |
302 | skcipher_queue_write(walk, p); | |
303 | ||
c821f6ab | 304 | if (offset_in_page(walk->page) + walk->nbytes + walk->stride > |
b286d8b1 HX |
305 | PAGE_SIZE) |
306 | walk->page = NULL; | |
307 | else | |
308 | walk->page += walk->nbytes; | |
309 | ||
310 | return 0; | |
311 | } | |
312 | ||
313 | static int skcipher_next_fast(struct skcipher_walk *walk) | |
314 | { | |
315 | unsigned long diff; | |
316 | ||
317 | walk->src.phys.page = scatterwalk_page(&walk->in); | |
318 | walk->src.phys.offset = offset_in_page(walk->in.offset); | |
319 | walk->dst.phys.page = scatterwalk_page(&walk->out); | |
320 | walk->dst.phys.offset = offset_in_page(walk->out.offset); | |
321 | ||
322 | if (walk->flags & SKCIPHER_WALK_PHYS) | |
323 | return 0; | |
324 | ||
325 | diff = walk->src.phys.offset - walk->dst.phys.offset; | |
326 | diff |= walk->src.virt.page - walk->dst.virt.page; | |
327 | ||
328 | skcipher_map_src(walk); | |
329 | walk->dst.virt.addr = walk->src.virt.addr; | |
330 | ||
331 | if (diff) { | |
332 | walk->flags |= SKCIPHER_WALK_DIFF; | |
333 | skcipher_map_dst(walk); | |
334 | } | |
335 | ||
336 | return 0; | |
337 | } | |
338 | ||
339 | static int skcipher_walk_next(struct skcipher_walk *walk) | |
340 | { | |
341 | unsigned int bsize; | |
342 | unsigned int n; | |
343 | int err; | |
344 | ||
345 | walk->flags &= ~(SKCIPHER_WALK_SLOW | SKCIPHER_WALK_COPY | | |
346 | SKCIPHER_WALK_DIFF); | |
347 | ||
348 | n = walk->total; | |
c821f6ab | 349 | bsize = min(walk->stride, max(n, walk->blocksize)); |
b286d8b1 HX |
350 | n = scatterwalk_clamp(&walk->in, n); |
351 | n = scatterwalk_clamp(&walk->out, n); | |
352 | ||
353 | if (unlikely(n < bsize)) { | |
354 | if (unlikely(walk->total < walk->blocksize)) | |
355 | return skcipher_walk_done(walk, -EINVAL); | |
356 | ||
357 | slow_path: | |
358 | err = skcipher_next_slow(walk, bsize); | |
359 | goto set_phys_lowmem; | |
360 | } | |
361 | ||
362 | if (unlikely((walk->in.offset | walk->out.offset) & walk->alignmask)) { | |
363 | if (!walk->page) { | |
364 | gfp_t gfp = skcipher_walk_gfp(walk); | |
365 | ||
366 | walk->page = (void *)__get_free_page(gfp); | |
367 | if (!walk->page) | |
368 | goto slow_path; | |
369 | } | |
370 | ||
371 | walk->nbytes = min_t(unsigned, n, | |
372 | PAGE_SIZE - offset_in_page(walk->page)); | |
373 | walk->flags |= SKCIPHER_WALK_COPY; | |
374 | err = skcipher_next_copy(walk); | |
375 | goto set_phys_lowmem; | |
376 | } | |
377 | ||
378 | walk->nbytes = n; | |
379 | ||
380 | return skcipher_next_fast(walk); | |
381 | ||
382 | set_phys_lowmem: | |
383 | if (!err && (walk->flags & SKCIPHER_WALK_PHYS)) { | |
384 | walk->src.phys.page = virt_to_page(walk->src.virt.addr); | |
385 | walk->dst.phys.page = virt_to_page(walk->dst.virt.addr); | |
386 | walk->src.phys.offset &= PAGE_SIZE - 1; | |
387 | walk->dst.phys.offset &= PAGE_SIZE - 1; | |
388 | } | |
389 | return err; | |
390 | } | |
391 | EXPORT_SYMBOL_GPL(skcipher_walk_next); | |
392 | ||
393 | static int skcipher_copy_iv(struct skcipher_walk *walk) | |
394 | { | |
395 | unsigned a = crypto_tfm_ctx_alignment() - 1; | |
396 | unsigned alignmask = walk->alignmask; | |
397 | unsigned ivsize = walk->ivsize; | |
c821f6ab | 398 | unsigned bs = walk->stride; |
b286d8b1 HX |
399 | unsigned aligned_bs; |
400 | unsigned size; | |
401 | u8 *iv; | |
402 | ||
a8fbe56b | 403 | aligned_bs = ALIGN(bs, alignmask + 1); |
b286d8b1 HX |
404 | |
405 | /* Minimum size to align buffer by alignmask. */ | |
406 | size = alignmask & ~a; | |
407 | ||
408 | if (walk->flags & SKCIPHER_WALK_PHYS) | |
409 | size += ivsize; | |
410 | else { | |
411 | size += aligned_bs + ivsize; | |
412 | ||
413 | /* Minimum size to ensure buffer does not straddle a page. */ | |
414 | size += (bs - 1) & ~(alignmask | a); | |
415 | } | |
416 | ||
417 | walk->buffer = kmalloc(size, skcipher_walk_gfp(walk)); | |
418 | if (!walk->buffer) | |
419 | return -ENOMEM; | |
420 | ||
421 | iv = PTR_ALIGN(walk->buffer, alignmask + 1); | |
422 | iv = skcipher_get_spot(iv, bs) + aligned_bs; | |
423 | ||
424 | walk->iv = memcpy(iv, walk->iv, walk->ivsize); | |
425 | return 0; | |
426 | } | |
427 | ||
428 | static int skcipher_walk_first(struct skcipher_walk *walk) | |
429 | { | |
b286d8b1 HX |
430 | if (WARN_ON_ONCE(in_irq())) |
431 | return -EDEADLK; | |
432 | ||
b286d8b1 HX |
433 | walk->buffer = NULL; |
434 | if (unlikely(((unsigned long)walk->iv & walk->alignmask))) { | |
435 | int err = skcipher_copy_iv(walk); | |
436 | if (err) | |
437 | return err; | |
438 | } | |
439 | ||
440 | walk->page = NULL; | |
441 | walk->nbytes = walk->total; | |
442 | ||
443 | return skcipher_walk_next(walk); | |
444 | } | |
445 | ||
446 | static int skcipher_walk_skcipher(struct skcipher_walk *walk, | |
447 | struct skcipher_request *req) | |
448 | { | |
449 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
450 | ||
0cabf2af HX |
451 | walk->total = req->cryptlen; |
452 | walk->nbytes = 0; | |
2b4f27c3 EB |
453 | walk->iv = req->iv; |
454 | walk->oiv = req->iv; | |
0cabf2af HX |
455 | |
456 | if (unlikely(!walk->total)) | |
457 | return 0; | |
458 | ||
b286d8b1 HX |
459 | scatterwalk_start(&walk->in, req->src); |
460 | scatterwalk_start(&walk->out, req->dst); | |
461 | ||
b286d8b1 HX |
462 | walk->flags &= ~SKCIPHER_WALK_SLEEP; |
463 | walk->flags |= req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? | |
464 | SKCIPHER_WALK_SLEEP : 0; | |
465 | ||
466 | walk->blocksize = crypto_skcipher_blocksize(tfm); | |
c821f6ab | 467 | walk->stride = crypto_skcipher_walksize(tfm); |
b286d8b1 HX |
468 | walk->ivsize = crypto_skcipher_ivsize(tfm); |
469 | walk->alignmask = crypto_skcipher_alignmask(tfm); | |
470 | ||
471 | return skcipher_walk_first(walk); | |
472 | } | |
473 | ||
474 | int skcipher_walk_virt(struct skcipher_walk *walk, | |
475 | struct skcipher_request *req, bool atomic) | |
476 | { | |
477 | int err; | |
478 | ||
479 | walk->flags &= ~SKCIPHER_WALK_PHYS; | |
480 | ||
481 | err = skcipher_walk_skcipher(walk, req); | |
482 | ||
483 | walk->flags &= atomic ? ~SKCIPHER_WALK_SLEEP : ~0; | |
484 | ||
485 | return err; | |
486 | } | |
487 | EXPORT_SYMBOL_GPL(skcipher_walk_virt); | |
488 | ||
489 | void skcipher_walk_atomise(struct skcipher_walk *walk) | |
490 | { | |
491 | walk->flags &= ~SKCIPHER_WALK_SLEEP; | |
492 | } | |
493 | EXPORT_SYMBOL_GPL(skcipher_walk_atomise); | |
494 | ||
495 | int skcipher_walk_async(struct skcipher_walk *walk, | |
496 | struct skcipher_request *req) | |
497 | { | |
498 | walk->flags |= SKCIPHER_WALK_PHYS; | |
499 | ||
500 | INIT_LIST_HEAD(&walk->buffers); | |
501 | ||
502 | return skcipher_walk_skcipher(walk, req); | |
503 | } | |
504 | EXPORT_SYMBOL_GPL(skcipher_walk_async); | |
505 | ||
34bc085c HX |
506 | static int skcipher_walk_aead_common(struct skcipher_walk *walk, |
507 | struct aead_request *req, bool atomic) | |
b286d8b1 HX |
508 | { |
509 | struct crypto_aead *tfm = crypto_aead_reqtfm(req); | |
510 | int err; | |
511 | ||
0cabf2af | 512 | walk->nbytes = 0; |
2b4f27c3 EB |
513 | walk->iv = req->iv; |
514 | walk->oiv = req->iv; | |
0cabf2af HX |
515 | |
516 | if (unlikely(!walk->total)) | |
517 | return 0; | |
518 | ||
3cbf61fb AB |
519 | walk->flags &= ~SKCIPHER_WALK_PHYS; |
520 | ||
b286d8b1 HX |
521 | scatterwalk_start(&walk->in, req->src); |
522 | scatterwalk_start(&walk->out, req->dst); | |
523 | ||
524 | scatterwalk_copychunks(NULL, &walk->in, req->assoclen, 2); | |
525 | scatterwalk_copychunks(NULL, &walk->out, req->assoclen, 2); | |
526 | ||
c14ca838 OM |
527 | scatterwalk_done(&walk->in, 0, walk->total); |
528 | scatterwalk_done(&walk->out, 0, walk->total); | |
529 | ||
b286d8b1 HX |
530 | if (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) |
531 | walk->flags |= SKCIPHER_WALK_SLEEP; | |
532 | else | |
533 | walk->flags &= ~SKCIPHER_WALK_SLEEP; | |
534 | ||
535 | walk->blocksize = crypto_aead_blocksize(tfm); | |
c821f6ab | 536 | walk->stride = crypto_aead_chunksize(tfm); |
b286d8b1 HX |
537 | walk->ivsize = crypto_aead_ivsize(tfm); |
538 | walk->alignmask = crypto_aead_alignmask(tfm); | |
539 | ||
540 | err = skcipher_walk_first(walk); | |
541 | ||
542 | if (atomic) | |
543 | walk->flags &= ~SKCIPHER_WALK_SLEEP; | |
544 | ||
545 | return err; | |
546 | } | |
34bc085c HX |
547 | |
548 | int skcipher_walk_aead(struct skcipher_walk *walk, struct aead_request *req, | |
549 | bool atomic) | |
550 | { | |
551 | walk->total = req->cryptlen; | |
552 | ||
553 | return skcipher_walk_aead_common(walk, req, atomic); | |
554 | } | |
b286d8b1 HX |
555 | EXPORT_SYMBOL_GPL(skcipher_walk_aead); |
556 | ||
34bc085c HX |
557 | int skcipher_walk_aead_encrypt(struct skcipher_walk *walk, |
558 | struct aead_request *req, bool atomic) | |
559 | { | |
560 | walk->total = req->cryptlen; | |
561 | ||
562 | return skcipher_walk_aead_common(walk, req, atomic); | |
563 | } | |
564 | EXPORT_SYMBOL_GPL(skcipher_walk_aead_encrypt); | |
565 | ||
566 | int skcipher_walk_aead_decrypt(struct skcipher_walk *walk, | |
567 | struct aead_request *req, bool atomic) | |
568 | { | |
569 | struct crypto_aead *tfm = crypto_aead_reqtfm(req); | |
570 | ||
571 | walk->total = req->cryptlen - crypto_aead_authsize(tfm); | |
572 | ||
573 | return skcipher_walk_aead_common(walk, req, atomic); | |
574 | } | |
575 | EXPORT_SYMBOL_GPL(skcipher_walk_aead_decrypt); | |
576 | ||
7a7ffe65 HX |
577 | static unsigned int crypto_skcipher_extsize(struct crypto_alg *alg) |
578 | { | |
579 | if (alg->cra_type == &crypto_blkcipher_type) | |
580 | return sizeof(struct crypto_blkcipher *); | |
581 | ||
4e6c3df4 HX |
582 | if (alg->cra_type == &crypto_ablkcipher_type || |
583 | alg->cra_type == &crypto_givcipher_type) | |
584 | return sizeof(struct crypto_ablkcipher *); | |
7a7ffe65 | 585 | |
4e6c3df4 | 586 | return crypto_alg_extsize(alg); |
7a7ffe65 HX |
587 | } |
588 | ||
589 | static int skcipher_setkey_blkcipher(struct crypto_skcipher *tfm, | |
590 | const u8 *key, unsigned int keylen) | |
591 | { | |
592 | struct crypto_blkcipher **ctx = crypto_skcipher_ctx(tfm); | |
593 | struct crypto_blkcipher *blkcipher = *ctx; | |
594 | int err; | |
595 | ||
596 | crypto_blkcipher_clear_flags(blkcipher, ~0); | |
597 | crypto_blkcipher_set_flags(blkcipher, crypto_skcipher_get_flags(tfm) & | |
598 | CRYPTO_TFM_REQ_MASK); | |
599 | err = crypto_blkcipher_setkey(blkcipher, key, keylen); | |
600 | crypto_skcipher_set_flags(tfm, crypto_blkcipher_get_flags(blkcipher) & | |
601 | CRYPTO_TFM_RES_MASK); | |
602 | ||
603 | return err; | |
604 | } | |
605 | ||
606 | static int skcipher_crypt_blkcipher(struct skcipher_request *req, | |
607 | int (*crypt)(struct blkcipher_desc *, | |
608 | struct scatterlist *, | |
609 | struct scatterlist *, | |
610 | unsigned int)) | |
611 | { | |
612 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
613 | struct crypto_blkcipher **ctx = crypto_skcipher_ctx(tfm); | |
614 | struct blkcipher_desc desc = { | |
615 | .tfm = *ctx, | |
616 | .info = req->iv, | |
617 | .flags = req->base.flags, | |
618 | }; | |
619 | ||
620 | ||
621 | return crypt(&desc, req->dst, req->src, req->cryptlen); | |
622 | } | |
623 | ||
624 | static int skcipher_encrypt_blkcipher(struct skcipher_request *req) | |
625 | { | |
626 | struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); | |
627 | struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher); | |
628 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; | |
629 | ||
630 | return skcipher_crypt_blkcipher(req, alg->encrypt); | |
631 | } | |
632 | ||
633 | static int skcipher_decrypt_blkcipher(struct skcipher_request *req) | |
634 | { | |
635 | struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); | |
636 | struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher); | |
637 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; | |
638 | ||
639 | return skcipher_crypt_blkcipher(req, alg->decrypt); | |
640 | } | |
641 | ||
642 | static void crypto_exit_skcipher_ops_blkcipher(struct crypto_tfm *tfm) | |
643 | { | |
644 | struct crypto_blkcipher **ctx = crypto_tfm_ctx(tfm); | |
645 | ||
646 | crypto_free_blkcipher(*ctx); | |
647 | } | |
648 | ||
ecdd6bed | 649 | static int crypto_init_skcipher_ops_blkcipher(struct crypto_tfm *tfm) |
7a7ffe65 HX |
650 | { |
651 | struct crypto_alg *calg = tfm->__crt_alg; | |
652 | struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm); | |
653 | struct crypto_blkcipher **ctx = crypto_tfm_ctx(tfm); | |
654 | struct crypto_blkcipher *blkcipher; | |
655 | struct crypto_tfm *btfm; | |
656 | ||
657 | if (!crypto_mod_get(calg)) | |
658 | return -EAGAIN; | |
659 | ||
660 | btfm = __crypto_alloc_tfm(calg, CRYPTO_ALG_TYPE_BLKCIPHER, | |
661 | CRYPTO_ALG_TYPE_MASK); | |
662 | if (IS_ERR(btfm)) { | |
663 | crypto_mod_put(calg); | |
664 | return PTR_ERR(btfm); | |
665 | } | |
666 | ||
667 | blkcipher = __crypto_blkcipher_cast(btfm); | |
668 | *ctx = blkcipher; | |
669 | tfm->exit = crypto_exit_skcipher_ops_blkcipher; | |
670 | ||
671 | skcipher->setkey = skcipher_setkey_blkcipher; | |
672 | skcipher->encrypt = skcipher_encrypt_blkcipher; | |
673 | skcipher->decrypt = skcipher_decrypt_blkcipher; | |
674 | ||
675 | skcipher->ivsize = crypto_blkcipher_ivsize(blkcipher); | |
973fb3fb | 676 | skcipher->keysize = calg->cra_blkcipher.max_keysize; |
7a7ffe65 HX |
677 | |
678 | return 0; | |
679 | } | |
680 | ||
681 | static int skcipher_setkey_ablkcipher(struct crypto_skcipher *tfm, | |
682 | const u8 *key, unsigned int keylen) | |
683 | { | |
684 | struct crypto_ablkcipher **ctx = crypto_skcipher_ctx(tfm); | |
685 | struct crypto_ablkcipher *ablkcipher = *ctx; | |
686 | int err; | |
687 | ||
688 | crypto_ablkcipher_clear_flags(ablkcipher, ~0); | |
689 | crypto_ablkcipher_set_flags(ablkcipher, | |
690 | crypto_skcipher_get_flags(tfm) & | |
691 | CRYPTO_TFM_REQ_MASK); | |
692 | err = crypto_ablkcipher_setkey(ablkcipher, key, keylen); | |
693 | crypto_skcipher_set_flags(tfm, | |
694 | crypto_ablkcipher_get_flags(ablkcipher) & | |
695 | CRYPTO_TFM_RES_MASK); | |
696 | ||
697 | return err; | |
698 | } | |
699 | ||
700 | static int skcipher_crypt_ablkcipher(struct skcipher_request *req, | |
701 | int (*crypt)(struct ablkcipher_request *)) | |
702 | { | |
703 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
704 | struct crypto_ablkcipher **ctx = crypto_skcipher_ctx(tfm); | |
705 | struct ablkcipher_request *subreq = skcipher_request_ctx(req); | |
706 | ||
707 | ablkcipher_request_set_tfm(subreq, *ctx); | |
708 | ablkcipher_request_set_callback(subreq, skcipher_request_flags(req), | |
709 | req->base.complete, req->base.data); | |
710 | ablkcipher_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, | |
711 | req->iv); | |
712 | ||
713 | return crypt(subreq); | |
714 | } | |
715 | ||
716 | static int skcipher_encrypt_ablkcipher(struct skcipher_request *req) | |
717 | { | |
718 | struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); | |
719 | struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher); | |
720 | struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher; | |
721 | ||
722 | return skcipher_crypt_ablkcipher(req, alg->encrypt); | |
723 | } | |
724 | ||
725 | static int skcipher_decrypt_ablkcipher(struct skcipher_request *req) | |
726 | { | |
727 | struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); | |
728 | struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher); | |
729 | struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher; | |
730 | ||
731 | return skcipher_crypt_ablkcipher(req, alg->decrypt); | |
732 | } | |
733 | ||
734 | static void crypto_exit_skcipher_ops_ablkcipher(struct crypto_tfm *tfm) | |
735 | { | |
736 | struct crypto_ablkcipher **ctx = crypto_tfm_ctx(tfm); | |
737 | ||
738 | crypto_free_ablkcipher(*ctx); | |
739 | } | |
740 | ||
ecdd6bed | 741 | static int crypto_init_skcipher_ops_ablkcipher(struct crypto_tfm *tfm) |
7a7ffe65 HX |
742 | { |
743 | struct crypto_alg *calg = tfm->__crt_alg; | |
744 | struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm); | |
745 | struct crypto_ablkcipher **ctx = crypto_tfm_ctx(tfm); | |
746 | struct crypto_ablkcipher *ablkcipher; | |
747 | struct crypto_tfm *abtfm; | |
748 | ||
749 | if (!crypto_mod_get(calg)) | |
750 | return -EAGAIN; | |
751 | ||
752 | abtfm = __crypto_alloc_tfm(calg, 0, 0); | |
753 | if (IS_ERR(abtfm)) { | |
754 | crypto_mod_put(calg); | |
755 | return PTR_ERR(abtfm); | |
756 | } | |
757 | ||
758 | ablkcipher = __crypto_ablkcipher_cast(abtfm); | |
759 | *ctx = ablkcipher; | |
760 | tfm->exit = crypto_exit_skcipher_ops_ablkcipher; | |
761 | ||
762 | skcipher->setkey = skcipher_setkey_ablkcipher; | |
763 | skcipher->encrypt = skcipher_encrypt_ablkcipher; | |
764 | skcipher->decrypt = skcipher_decrypt_ablkcipher; | |
765 | ||
766 | skcipher->ivsize = crypto_ablkcipher_ivsize(ablkcipher); | |
767 | skcipher->reqsize = crypto_ablkcipher_reqsize(ablkcipher) + | |
768 | sizeof(struct ablkcipher_request); | |
973fb3fb | 769 | skcipher->keysize = calg->cra_ablkcipher.max_keysize; |
7a7ffe65 HX |
770 | |
771 | return 0; | |
772 | } | |
773 | ||
9933e113 HX |
774 | static int skcipher_setkey_unaligned(struct crypto_skcipher *tfm, |
775 | const u8 *key, unsigned int keylen) | |
776 | { | |
777 | unsigned long alignmask = crypto_skcipher_alignmask(tfm); | |
778 | struct skcipher_alg *cipher = crypto_skcipher_alg(tfm); | |
779 | u8 *buffer, *alignbuffer; | |
780 | unsigned long absize; | |
781 | int ret; | |
782 | ||
783 | absize = keylen + alignmask; | |
784 | buffer = kmalloc(absize, GFP_ATOMIC); | |
785 | if (!buffer) | |
786 | return -ENOMEM; | |
787 | ||
788 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
789 | memcpy(alignbuffer, key, keylen); | |
790 | ret = cipher->setkey(tfm, alignbuffer, keylen); | |
791 | kzfree(buffer); | |
792 | return ret; | |
793 | } | |
794 | ||
795 | static int skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key, | |
796 | unsigned int keylen) | |
797 | { | |
798 | struct skcipher_alg *cipher = crypto_skcipher_alg(tfm); | |
799 | unsigned long alignmask = crypto_skcipher_alignmask(tfm); | |
800 | ||
801 | if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) { | |
802 | crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); | |
803 | return -EINVAL; | |
804 | } | |
805 | ||
806 | if ((unsigned long)key & alignmask) | |
807 | return skcipher_setkey_unaligned(tfm, key, keylen); | |
808 | ||
809 | return cipher->setkey(tfm, key, keylen); | |
810 | } | |
811 | ||
4e6c3df4 HX |
812 | static void crypto_skcipher_exit_tfm(struct crypto_tfm *tfm) |
813 | { | |
814 | struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm); | |
815 | struct skcipher_alg *alg = crypto_skcipher_alg(skcipher); | |
816 | ||
817 | alg->exit(skcipher); | |
818 | } | |
819 | ||
7a7ffe65 HX |
820 | static int crypto_skcipher_init_tfm(struct crypto_tfm *tfm) |
821 | { | |
4e6c3df4 HX |
822 | struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm); |
823 | struct skcipher_alg *alg = crypto_skcipher_alg(skcipher); | |
824 | ||
7a7ffe65 HX |
825 | if (tfm->__crt_alg->cra_type == &crypto_blkcipher_type) |
826 | return crypto_init_skcipher_ops_blkcipher(tfm); | |
827 | ||
4e6c3df4 HX |
828 | if (tfm->__crt_alg->cra_type == &crypto_ablkcipher_type || |
829 | tfm->__crt_alg->cra_type == &crypto_givcipher_type) | |
830 | return crypto_init_skcipher_ops_ablkcipher(tfm); | |
831 | ||
9933e113 | 832 | skcipher->setkey = skcipher_setkey; |
4e6c3df4 HX |
833 | skcipher->encrypt = alg->encrypt; |
834 | skcipher->decrypt = alg->decrypt; | |
835 | skcipher->ivsize = alg->ivsize; | |
836 | skcipher->keysize = alg->max_keysize; | |
837 | ||
838 | if (alg->exit) | |
839 | skcipher->base.exit = crypto_skcipher_exit_tfm; | |
7a7ffe65 | 840 | |
4e6c3df4 HX |
841 | if (alg->init) |
842 | return alg->init(skcipher); | |
843 | ||
844 | return 0; | |
845 | } | |
846 | ||
847 | static void crypto_skcipher_free_instance(struct crypto_instance *inst) | |
848 | { | |
849 | struct skcipher_instance *skcipher = | |
850 | container_of(inst, struct skcipher_instance, s.base); | |
851 | ||
852 | skcipher->free(skcipher); | |
853 | } | |
854 | ||
855 | static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg) | |
d8c34b94 | 856 | __maybe_unused; |
4e6c3df4 HX |
857 | static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg) |
858 | { | |
859 | struct skcipher_alg *skcipher = container_of(alg, struct skcipher_alg, | |
860 | base); | |
861 | ||
862 | seq_printf(m, "type : skcipher\n"); | |
863 | seq_printf(m, "async : %s\n", | |
864 | alg->cra_flags & CRYPTO_ALG_ASYNC ? "yes" : "no"); | |
865 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
866 | seq_printf(m, "min keysize : %u\n", skcipher->min_keysize); | |
867 | seq_printf(m, "max keysize : %u\n", skcipher->max_keysize); | |
868 | seq_printf(m, "ivsize : %u\n", skcipher->ivsize); | |
869 | seq_printf(m, "chunksize : %u\n", skcipher->chunksize); | |
c821f6ab | 870 | seq_printf(m, "walksize : %u\n", skcipher->walksize); |
7a7ffe65 HX |
871 | } |
872 | ||
4e6c3df4 HX |
873 | #ifdef CONFIG_NET |
874 | static int crypto_skcipher_report(struct sk_buff *skb, struct crypto_alg *alg) | |
875 | { | |
876 | struct crypto_report_blkcipher rblkcipher; | |
877 | struct skcipher_alg *skcipher = container_of(alg, struct skcipher_alg, | |
878 | base); | |
879 | ||
880 | strncpy(rblkcipher.type, "skcipher", sizeof(rblkcipher.type)); | |
881 | strncpy(rblkcipher.geniv, "<none>", sizeof(rblkcipher.geniv)); | |
882 | ||
883 | rblkcipher.blocksize = alg->cra_blocksize; | |
884 | rblkcipher.min_keysize = skcipher->min_keysize; | |
885 | rblkcipher.max_keysize = skcipher->max_keysize; | |
886 | rblkcipher.ivsize = skcipher->ivsize; | |
887 | ||
888 | if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER, | |
889 | sizeof(struct crypto_report_blkcipher), &rblkcipher)) | |
890 | goto nla_put_failure; | |
891 | return 0; | |
892 | ||
893 | nla_put_failure: | |
894 | return -EMSGSIZE; | |
895 | } | |
896 | #else | |
897 | static int crypto_skcipher_report(struct sk_buff *skb, struct crypto_alg *alg) | |
898 | { | |
899 | return -ENOSYS; | |
900 | } | |
901 | #endif | |
902 | ||
7a7ffe65 HX |
903 | static const struct crypto_type crypto_skcipher_type2 = { |
904 | .extsize = crypto_skcipher_extsize, | |
905 | .init_tfm = crypto_skcipher_init_tfm, | |
4e6c3df4 HX |
906 | .free = crypto_skcipher_free_instance, |
907 | #ifdef CONFIG_PROC_FS | |
908 | .show = crypto_skcipher_show, | |
909 | #endif | |
910 | .report = crypto_skcipher_report, | |
7a7ffe65 HX |
911 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, |
912 | .maskset = CRYPTO_ALG_TYPE_BLKCIPHER_MASK, | |
4e6c3df4 | 913 | .type = CRYPTO_ALG_TYPE_SKCIPHER, |
7a7ffe65 HX |
914 | .tfmsize = offsetof(struct crypto_skcipher, base), |
915 | }; | |
916 | ||
3a01d0ee | 917 | int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, |
4e6c3df4 HX |
918 | const char *name, u32 type, u32 mask) |
919 | { | |
920 | spawn->base.frontend = &crypto_skcipher_type2; | |
921 | return crypto_grab_spawn(&spawn->base, name, type, mask); | |
922 | } | |
3a01d0ee | 923 | EXPORT_SYMBOL_GPL(crypto_grab_skcipher); |
4e6c3df4 | 924 | |
7a7ffe65 HX |
925 | struct crypto_skcipher *crypto_alloc_skcipher(const char *alg_name, |
926 | u32 type, u32 mask) | |
927 | { | |
928 | return crypto_alloc_tfm(alg_name, &crypto_skcipher_type2, type, mask); | |
929 | } | |
930 | EXPORT_SYMBOL_GPL(crypto_alloc_skcipher); | |
931 | ||
4e6c3df4 HX |
932 | int crypto_has_skcipher2(const char *alg_name, u32 type, u32 mask) |
933 | { | |
934 | return crypto_type_has_alg(alg_name, &crypto_skcipher_type2, | |
935 | type, mask); | |
936 | } | |
937 | EXPORT_SYMBOL_GPL(crypto_has_skcipher2); | |
938 | ||
939 | static int skcipher_prepare_alg(struct skcipher_alg *alg) | |
940 | { | |
941 | struct crypto_alg *base = &alg->base; | |
942 | ||
c821f6ab AB |
943 | if (alg->ivsize > PAGE_SIZE / 8 || alg->chunksize > PAGE_SIZE / 8 || |
944 | alg->walksize > PAGE_SIZE / 8) | |
4e6c3df4 HX |
945 | return -EINVAL; |
946 | ||
947 | if (!alg->chunksize) | |
948 | alg->chunksize = base->cra_blocksize; | |
c821f6ab AB |
949 | if (!alg->walksize) |
950 | alg->walksize = alg->chunksize; | |
4e6c3df4 HX |
951 | |
952 | base->cra_type = &crypto_skcipher_type2; | |
953 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; | |
954 | base->cra_flags |= CRYPTO_ALG_TYPE_SKCIPHER; | |
955 | ||
956 | return 0; | |
957 | } | |
958 | ||
959 | int crypto_register_skcipher(struct skcipher_alg *alg) | |
960 | { | |
961 | struct crypto_alg *base = &alg->base; | |
962 | int err; | |
963 | ||
964 | err = skcipher_prepare_alg(alg); | |
965 | if (err) | |
966 | return err; | |
967 | ||
968 | return crypto_register_alg(base); | |
969 | } | |
970 | EXPORT_SYMBOL_GPL(crypto_register_skcipher); | |
971 | ||
972 | void crypto_unregister_skcipher(struct skcipher_alg *alg) | |
973 | { | |
974 | crypto_unregister_alg(&alg->base); | |
975 | } | |
976 | EXPORT_SYMBOL_GPL(crypto_unregister_skcipher); | |
977 | ||
978 | int crypto_register_skciphers(struct skcipher_alg *algs, int count) | |
979 | { | |
980 | int i, ret; | |
981 | ||
982 | for (i = 0; i < count; i++) { | |
983 | ret = crypto_register_skcipher(&algs[i]); | |
984 | if (ret) | |
985 | goto err; | |
986 | } | |
987 | ||
988 | return 0; | |
989 | ||
990 | err: | |
991 | for (--i; i >= 0; --i) | |
992 | crypto_unregister_skcipher(&algs[i]); | |
993 | ||
994 | return ret; | |
995 | } | |
996 | EXPORT_SYMBOL_GPL(crypto_register_skciphers); | |
997 | ||
998 | void crypto_unregister_skciphers(struct skcipher_alg *algs, int count) | |
999 | { | |
1000 | int i; | |
1001 | ||
1002 | for (i = count - 1; i >= 0; --i) | |
1003 | crypto_unregister_skcipher(&algs[i]); | |
1004 | } | |
1005 | EXPORT_SYMBOL_GPL(crypto_unregister_skciphers); | |
1006 | ||
1007 | int skcipher_register_instance(struct crypto_template *tmpl, | |
1008 | struct skcipher_instance *inst) | |
1009 | { | |
1010 | int err; | |
1011 | ||
1012 | err = skcipher_prepare_alg(&inst->alg); | |
1013 | if (err) | |
1014 | return err; | |
1015 | ||
1016 | return crypto_register_instance(tmpl, skcipher_crypto_instance(inst)); | |
1017 | } | |
1018 | EXPORT_SYMBOL_GPL(skcipher_register_instance); | |
1019 | ||
7a7ffe65 HX |
1020 | MODULE_LICENSE("GPL"); |
1021 | MODULE_DESCRIPTION("Symmetric key cipher type"); |