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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
7a7ffe65 HX |
2 | /* |
3 | * Symmetric key cipher operations. | |
4 | * | |
5 | * Generic encrypt/decrypt wrapper for ciphers, handles operations across | |
6 | * multiple page boundaries by using temporary blocks. In user context, | |
7 | * the kernel is given a chance to schedule us once per page. | |
8 | * | |
9 | * Copyright (c) 2015 Herbert Xu <herbert@gondor.apana.org.au> | |
7a7ffe65 HX |
10 | */ |
11 | ||
b286d8b1 | 12 | #include <crypto/internal/aead.h> |
7a7ffe65 | 13 | #include <crypto/internal/skcipher.h> |
b286d8b1 | 14 | #include <crypto/scatterwalk.h> |
7a7ffe65 | 15 | #include <linux/bug.h> |
4e6c3df4 | 16 | #include <linux/cryptouser.h> |
d8c34b94 | 17 | #include <linux/compiler.h> |
b286d8b1 | 18 | #include <linux/list.h> |
7a7ffe65 | 19 | #include <linux/module.h> |
4e6c3df4 HX |
20 | #include <linux/rtnetlink.h> |
21 | #include <linux/seq_file.h> | |
22 | #include <net/netlink.h> | |
7a7ffe65 HX |
23 | |
24 | #include "internal.h" | |
25 | ||
b286d8b1 HX |
26 | enum { |
27 | SKCIPHER_WALK_PHYS = 1 << 0, | |
28 | SKCIPHER_WALK_SLOW = 1 << 1, | |
29 | SKCIPHER_WALK_COPY = 1 << 2, | |
30 | SKCIPHER_WALK_DIFF = 1 << 3, | |
31 | SKCIPHER_WALK_SLEEP = 1 << 4, | |
32 | }; | |
33 | ||
34 | struct skcipher_walk_buffer { | |
35 | struct list_head entry; | |
36 | struct scatter_walk dst; | |
37 | unsigned int len; | |
38 | u8 *data; | |
39 | u8 buffer[]; | |
40 | }; | |
41 | ||
42 | static int skcipher_walk_next(struct skcipher_walk *walk); | |
43 | ||
44 | static inline void skcipher_unmap(struct scatter_walk *walk, void *vaddr) | |
45 | { | |
46 | if (PageHighMem(scatterwalk_page(walk))) | |
47 | kunmap_atomic(vaddr); | |
48 | } | |
49 | ||
50 | static inline void *skcipher_map(struct scatter_walk *walk) | |
51 | { | |
52 | struct page *page = scatterwalk_page(walk); | |
53 | ||
54 | return (PageHighMem(page) ? kmap_atomic(page) : page_address(page)) + | |
55 | offset_in_page(walk->offset); | |
56 | } | |
57 | ||
58 | static inline void skcipher_map_src(struct skcipher_walk *walk) | |
59 | { | |
60 | walk->src.virt.addr = skcipher_map(&walk->in); | |
61 | } | |
62 | ||
63 | static inline void skcipher_map_dst(struct skcipher_walk *walk) | |
64 | { | |
65 | walk->dst.virt.addr = skcipher_map(&walk->out); | |
66 | } | |
67 | ||
68 | static inline void skcipher_unmap_src(struct skcipher_walk *walk) | |
69 | { | |
70 | skcipher_unmap(&walk->in, walk->src.virt.addr); | |
71 | } | |
72 | ||
73 | static inline void skcipher_unmap_dst(struct skcipher_walk *walk) | |
74 | { | |
75 | skcipher_unmap(&walk->out, walk->dst.virt.addr); | |
76 | } | |
77 | ||
78 | static inline gfp_t skcipher_walk_gfp(struct skcipher_walk *walk) | |
79 | { | |
80 | return walk->flags & SKCIPHER_WALK_SLEEP ? GFP_KERNEL : GFP_ATOMIC; | |
81 | } | |
82 | ||
83 | /* Get a spot of the specified length that does not straddle a page. | |
84 | * The caller needs to ensure that there is enough space for this operation. | |
85 | */ | |
86 | static inline u8 *skcipher_get_spot(u8 *start, unsigned int len) | |
87 | { | |
88 | u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK); | |
89 | ||
90 | return max(start, end_page); | |
91 | } | |
92 | ||
8088d3dd | 93 | static void skcipher_done_slow(struct skcipher_walk *walk, unsigned int bsize) |
b286d8b1 HX |
94 | { |
95 | u8 *addr; | |
96 | ||
97 | addr = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1); | |
98 | addr = skcipher_get_spot(addr, bsize); | |
99 | scatterwalk_copychunks(addr, &walk->out, bsize, | |
100 | (walk->flags & SKCIPHER_WALK_PHYS) ? 2 : 1); | |
b286d8b1 HX |
101 | } |
102 | ||
103 | int skcipher_walk_done(struct skcipher_walk *walk, int err) | |
104 | { | |
8088d3dd EB |
105 | unsigned int n; /* bytes processed */ |
106 | bool more; | |
107 | ||
108 | if (unlikely(err < 0)) | |
109 | goto finish; | |
110 | ||
111 | n = walk->nbytes - err; | |
112 | walk->total -= n; | |
113 | more = (walk->total != 0); | |
114 | ||
115 | if (likely(!(walk->flags & (SKCIPHER_WALK_PHYS | | |
116 | SKCIPHER_WALK_SLOW | | |
117 | SKCIPHER_WALK_COPY | | |
118 | SKCIPHER_WALK_DIFF)))) { | |
b286d8b1 HX |
119 | unmap_src: |
120 | skcipher_unmap_src(walk); | |
121 | } else if (walk->flags & SKCIPHER_WALK_DIFF) { | |
122 | skcipher_unmap_dst(walk); | |
123 | goto unmap_src; | |
124 | } else if (walk->flags & SKCIPHER_WALK_COPY) { | |
125 | skcipher_map_dst(walk); | |
126 | memcpy(walk->dst.virt.addr, walk->page, n); | |
127 | skcipher_unmap_dst(walk); | |
128 | } else if (unlikely(walk->flags & SKCIPHER_WALK_SLOW)) { | |
dcaca01a EB |
129 | if (err) { |
130 | /* | |
131 | * Didn't process all bytes. Either the algorithm is | |
132 | * broken, or this was the last step and it turned out | |
133 | * the message wasn't evenly divisible into blocks but | |
134 | * the algorithm requires it. | |
135 | */ | |
b286d8b1 | 136 | err = -EINVAL; |
8088d3dd 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); | |
8088d3dd EB |
145 | already_advanced: |
146 | scatterwalk_done(&walk->in, 0, more); | |
147 | scatterwalk_done(&walk->out, 1, more); | |
b286d8b1 | 148 | |
8088d3dd | 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 | } | |
8088d3dd 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 | } | |
b286d8b1 HX |
391 | |
392 | static int skcipher_copy_iv(struct skcipher_walk *walk) | |
393 | { | |
394 | unsigned a = crypto_tfm_ctx_alignment() - 1; | |
395 | unsigned alignmask = walk->alignmask; | |
396 | unsigned ivsize = walk->ivsize; | |
c821f6ab | 397 | unsigned bs = walk->stride; |
b286d8b1 HX |
398 | unsigned aligned_bs; |
399 | unsigned size; | |
400 | u8 *iv; | |
401 | ||
0567fc9e | 402 | aligned_bs = ALIGN(bs, alignmask + 1); |
b286d8b1 HX |
403 | |
404 | /* Minimum size to align buffer by alignmask. */ | |
405 | size = alignmask & ~a; | |
406 | ||
407 | if (walk->flags & SKCIPHER_WALK_PHYS) | |
408 | size += ivsize; | |
409 | else { | |
410 | size += aligned_bs + ivsize; | |
411 | ||
412 | /* Minimum size to ensure buffer does not straddle a page. */ | |
413 | size += (bs - 1) & ~(alignmask | a); | |
414 | } | |
415 | ||
416 | walk->buffer = kmalloc(size, skcipher_walk_gfp(walk)); | |
417 | if (!walk->buffer) | |
418 | return -ENOMEM; | |
419 | ||
420 | iv = PTR_ALIGN(walk->buffer, alignmask + 1); | |
421 | iv = skcipher_get_spot(iv, bs) + aligned_bs; | |
422 | ||
423 | walk->iv = memcpy(iv, walk->iv, walk->ivsize); | |
424 | return 0; | |
425 | } | |
426 | ||
427 | static int skcipher_walk_first(struct skcipher_walk *walk) | |
428 | { | |
b286d8b1 HX |
429 | if (WARN_ON_ONCE(in_irq())) |
430 | return -EDEADLK; | |
431 | ||
b286d8b1 HX |
432 | walk->buffer = NULL; |
433 | if (unlikely(((unsigned long)walk->iv & walk->alignmask))) { | |
434 | int err = skcipher_copy_iv(walk); | |
435 | if (err) | |
436 | return err; | |
437 | } | |
438 | ||
439 | walk->page = NULL; | |
b286d8b1 HX |
440 | |
441 | return skcipher_walk_next(walk); | |
442 | } | |
443 | ||
444 | static int skcipher_walk_skcipher(struct skcipher_walk *walk, | |
445 | struct skcipher_request *req) | |
446 | { | |
447 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
448 | ||
0cabf2af HX |
449 | walk->total = req->cryptlen; |
450 | walk->nbytes = 0; | |
2b4f27c3 EB |
451 | walk->iv = req->iv; |
452 | walk->oiv = req->iv; | |
0cabf2af HX |
453 | |
454 | if (unlikely(!walk->total)) | |
455 | return 0; | |
456 | ||
b286d8b1 HX |
457 | scatterwalk_start(&walk->in, req->src); |
458 | scatterwalk_start(&walk->out, req->dst); | |
459 | ||
b286d8b1 HX |
460 | walk->flags &= ~SKCIPHER_WALK_SLEEP; |
461 | walk->flags |= req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? | |
462 | SKCIPHER_WALK_SLEEP : 0; | |
463 | ||
464 | walk->blocksize = crypto_skcipher_blocksize(tfm); | |
c821f6ab | 465 | walk->stride = crypto_skcipher_walksize(tfm); |
b286d8b1 HX |
466 | walk->ivsize = crypto_skcipher_ivsize(tfm); |
467 | walk->alignmask = crypto_skcipher_alignmask(tfm); | |
468 | ||
469 | return skcipher_walk_first(walk); | |
470 | } | |
471 | ||
472 | int skcipher_walk_virt(struct skcipher_walk *walk, | |
473 | struct skcipher_request *req, bool atomic) | |
474 | { | |
475 | int err; | |
476 | ||
bb648291 EB |
477 | might_sleep_if(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP); |
478 | ||
b286d8b1 HX |
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 | ||
c79b411e | 582 | if (alg->cra_type == &crypto_ablkcipher_type) |
4e6c3df4 | 583 | return sizeof(struct crypto_ablkcipher *); |
7a7ffe65 | 584 | |
4e6c3df4 | 585 | return crypto_alg_extsize(alg); |
7a7ffe65 HX |
586 | } |
587 | ||
b1f6b4bf EB |
588 | static void skcipher_set_needkey(struct crypto_skcipher *tfm) |
589 | { | |
590 | if (tfm->keysize) | |
591 | crypto_skcipher_set_flags(tfm, CRYPTO_TFM_NEED_KEY); | |
592 | } | |
593 | ||
7a7ffe65 HX |
594 | static int skcipher_setkey_blkcipher(struct crypto_skcipher *tfm, |
595 | const u8 *key, unsigned int keylen) | |
596 | { | |
597 | struct crypto_blkcipher **ctx = crypto_skcipher_ctx(tfm); | |
598 | struct crypto_blkcipher *blkcipher = *ctx; | |
599 | int err; | |
600 | ||
601 | crypto_blkcipher_clear_flags(blkcipher, ~0); | |
602 | crypto_blkcipher_set_flags(blkcipher, crypto_skcipher_get_flags(tfm) & | |
603 | CRYPTO_TFM_REQ_MASK); | |
604 | err = crypto_blkcipher_setkey(blkcipher, key, keylen); | |
605 | crypto_skcipher_set_flags(tfm, crypto_blkcipher_get_flags(blkcipher) & | |
606 | CRYPTO_TFM_RES_MASK); | |
b1f6b4bf EB |
607 | if (unlikely(err)) { |
608 | skcipher_set_needkey(tfm); | |
f8d33fac | 609 | return err; |
b1f6b4bf | 610 | } |
7a7ffe65 | 611 | |
f8d33fac EB |
612 | crypto_skcipher_clear_flags(tfm, CRYPTO_TFM_NEED_KEY); |
613 | return 0; | |
7a7ffe65 HX |
614 | } |
615 | ||
616 | static int skcipher_crypt_blkcipher(struct skcipher_request *req, | |
617 | int (*crypt)(struct blkcipher_desc *, | |
618 | struct scatterlist *, | |
619 | struct scatterlist *, | |
620 | unsigned int)) | |
621 | { | |
622 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
623 | struct crypto_blkcipher **ctx = crypto_skcipher_ctx(tfm); | |
624 | struct blkcipher_desc desc = { | |
625 | .tfm = *ctx, | |
626 | .info = req->iv, | |
627 | .flags = req->base.flags, | |
628 | }; | |
629 | ||
630 | ||
631 | return crypt(&desc, req->dst, req->src, req->cryptlen); | |
632 | } | |
633 | ||
634 | static int skcipher_encrypt_blkcipher(struct skcipher_request *req) | |
635 | { | |
636 | struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); | |
637 | struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher); | |
638 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; | |
639 | ||
640 | return skcipher_crypt_blkcipher(req, alg->encrypt); | |
641 | } | |
642 | ||
643 | static int skcipher_decrypt_blkcipher(struct skcipher_request *req) | |
644 | { | |
645 | struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); | |
646 | struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher); | |
647 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; | |
648 | ||
649 | return skcipher_crypt_blkcipher(req, alg->decrypt); | |
650 | } | |
651 | ||
652 | static void crypto_exit_skcipher_ops_blkcipher(struct crypto_tfm *tfm) | |
653 | { | |
654 | struct crypto_blkcipher **ctx = crypto_tfm_ctx(tfm); | |
655 | ||
656 | crypto_free_blkcipher(*ctx); | |
657 | } | |
658 | ||
ecdd6bed | 659 | static int crypto_init_skcipher_ops_blkcipher(struct crypto_tfm *tfm) |
7a7ffe65 HX |
660 | { |
661 | struct crypto_alg *calg = tfm->__crt_alg; | |
662 | struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm); | |
663 | struct crypto_blkcipher **ctx = crypto_tfm_ctx(tfm); | |
664 | struct crypto_blkcipher *blkcipher; | |
665 | struct crypto_tfm *btfm; | |
666 | ||
667 | if (!crypto_mod_get(calg)) | |
668 | return -EAGAIN; | |
669 | ||
670 | btfm = __crypto_alloc_tfm(calg, CRYPTO_ALG_TYPE_BLKCIPHER, | |
671 | CRYPTO_ALG_TYPE_MASK); | |
672 | if (IS_ERR(btfm)) { | |
673 | crypto_mod_put(calg); | |
674 | return PTR_ERR(btfm); | |
675 | } | |
676 | ||
677 | blkcipher = __crypto_blkcipher_cast(btfm); | |
678 | *ctx = blkcipher; | |
679 | tfm->exit = crypto_exit_skcipher_ops_blkcipher; | |
680 | ||
681 | skcipher->setkey = skcipher_setkey_blkcipher; | |
682 | skcipher->encrypt = skcipher_encrypt_blkcipher; | |
683 | skcipher->decrypt = skcipher_decrypt_blkcipher; | |
684 | ||
685 | skcipher->ivsize = crypto_blkcipher_ivsize(blkcipher); | |
973fb3fb | 686 | skcipher->keysize = calg->cra_blkcipher.max_keysize; |
7a7ffe65 | 687 | |
b1f6b4bf | 688 | skcipher_set_needkey(skcipher); |
f8d33fac | 689 | |
7a7ffe65 HX |
690 | return 0; |
691 | } | |
692 | ||
693 | static int skcipher_setkey_ablkcipher(struct crypto_skcipher *tfm, | |
694 | const u8 *key, unsigned int keylen) | |
695 | { | |
696 | struct crypto_ablkcipher **ctx = crypto_skcipher_ctx(tfm); | |
697 | struct crypto_ablkcipher *ablkcipher = *ctx; | |
698 | int err; | |
699 | ||
700 | crypto_ablkcipher_clear_flags(ablkcipher, ~0); | |
701 | crypto_ablkcipher_set_flags(ablkcipher, | |
702 | crypto_skcipher_get_flags(tfm) & | |
703 | CRYPTO_TFM_REQ_MASK); | |
704 | err = crypto_ablkcipher_setkey(ablkcipher, key, keylen); | |
705 | crypto_skcipher_set_flags(tfm, | |
706 | crypto_ablkcipher_get_flags(ablkcipher) & | |
707 | CRYPTO_TFM_RES_MASK); | |
b1f6b4bf EB |
708 | if (unlikely(err)) { |
709 | skcipher_set_needkey(tfm); | |
f8d33fac | 710 | return err; |
b1f6b4bf | 711 | } |
7a7ffe65 | 712 | |
f8d33fac EB |
713 | crypto_skcipher_clear_flags(tfm, CRYPTO_TFM_NEED_KEY); |
714 | return 0; | |
7a7ffe65 HX |
715 | } |
716 | ||
717 | static int skcipher_crypt_ablkcipher(struct skcipher_request *req, | |
718 | int (*crypt)(struct ablkcipher_request *)) | |
719 | { | |
720 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
721 | struct crypto_ablkcipher **ctx = crypto_skcipher_ctx(tfm); | |
722 | struct ablkcipher_request *subreq = skcipher_request_ctx(req); | |
723 | ||
724 | ablkcipher_request_set_tfm(subreq, *ctx); | |
725 | ablkcipher_request_set_callback(subreq, skcipher_request_flags(req), | |
726 | req->base.complete, req->base.data); | |
727 | ablkcipher_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, | |
728 | req->iv); | |
729 | ||
730 | return crypt(subreq); | |
731 | } | |
732 | ||
733 | static int skcipher_encrypt_ablkcipher(struct skcipher_request *req) | |
734 | { | |
735 | struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); | |
736 | struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher); | |
737 | struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher; | |
738 | ||
739 | return skcipher_crypt_ablkcipher(req, alg->encrypt); | |
740 | } | |
741 | ||
742 | static int skcipher_decrypt_ablkcipher(struct skcipher_request *req) | |
743 | { | |
744 | struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); | |
745 | struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher); | |
746 | struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher; | |
747 | ||
748 | return skcipher_crypt_ablkcipher(req, alg->decrypt); | |
749 | } | |
750 | ||
751 | static void crypto_exit_skcipher_ops_ablkcipher(struct crypto_tfm *tfm) | |
752 | { | |
753 | struct crypto_ablkcipher **ctx = crypto_tfm_ctx(tfm); | |
754 | ||
755 | crypto_free_ablkcipher(*ctx); | |
756 | } | |
757 | ||
ecdd6bed | 758 | static int crypto_init_skcipher_ops_ablkcipher(struct crypto_tfm *tfm) |
7a7ffe65 HX |
759 | { |
760 | struct crypto_alg *calg = tfm->__crt_alg; | |
761 | struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm); | |
762 | struct crypto_ablkcipher **ctx = crypto_tfm_ctx(tfm); | |
763 | struct crypto_ablkcipher *ablkcipher; | |
764 | struct crypto_tfm *abtfm; | |
765 | ||
766 | if (!crypto_mod_get(calg)) | |
767 | return -EAGAIN; | |
768 | ||
769 | abtfm = __crypto_alloc_tfm(calg, 0, 0); | |
770 | if (IS_ERR(abtfm)) { | |
771 | crypto_mod_put(calg); | |
772 | return PTR_ERR(abtfm); | |
773 | } | |
774 | ||
775 | ablkcipher = __crypto_ablkcipher_cast(abtfm); | |
776 | *ctx = ablkcipher; | |
777 | tfm->exit = crypto_exit_skcipher_ops_ablkcipher; | |
778 | ||
779 | skcipher->setkey = skcipher_setkey_ablkcipher; | |
780 | skcipher->encrypt = skcipher_encrypt_ablkcipher; | |
781 | skcipher->decrypt = skcipher_decrypt_ablkcipher; | |
782 | ||
783 | skcipher->ivsize = crypto_ablkcipher_ivsize(ablkcipher); | |
784 | skcipher->reqsize = crypto_ablkcipher_reqsize(ablkcipher) + | |
785 | sizeof(struct ablkcipher_request); | |
973fb3fb | 786 | skcipher->keysize = calg->cra_ablkcipher.max_keysize; |
7a7ffe65 | 787 | |
b1f6b4bf | 788 | skcipher_set_needkey(skcipher); |
f8d33fac | 789 | |
7a7ffe65 HX |
790 | return 0; |
791 | } | |
792 | ||
9933e113 HX |
793 | static int skcipher_setkey_unaligned(struct crypto_skcipher *tfm, |
794 | const u8 *key, unsigned int keylen) | |
795 | { | |
796 | unsigned long alignmask = crypto_skcipher_alignmask(tfm); | |
797 | struct skcipher_alg *cipher = crypto_skcipher_alg(tfm); | |
798 | u8 *buffer, *alignbuffer; | |
799 | unsigned long absize; | |
800 | int ret; | |
801 | ||
802 | absize = keylen + alignmask; | |
803 | buffer = kmalloc(absize, GFP_ATOMIC); | |
804 | if (!buffer) | |
805 | return -ENOMEM; | |
806 | ||
807 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
808 | memcpy(alignbuffer, key, keylen); | |
809 | ret = cipher->setkey(tfm, alignbuffer, keylen); | |
810 | kzfree(buffer); | |
811 | return ret; | |
812 | } | |
813 | ||
814 | static int skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key, | |
815 | unsigned int keylen) | |
816 | { | |
817 | struct skcipher_alg *cipher = crypto_skcipher_alg(tfm); | |
818 | unsigned long alignmask = crypto_skcipher_alignmask(tfm); | |
f8d33fac | 819 | int err; |
9933e113 HX |
820 | |
821 | if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) { | |
822 | crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); | |
823 | return -EINVAL; | |
824 | } | |
825 | ||
826 | if ((unsigned long)key & alignmask) | |
f8d33fac EB |
827 | err = skcipher_setkey_unaligned(tfm, key, keylen); |
828 | else | |
829 | err = cipher->setkey(tfm, key, keylen); | |
830 | ||
b1f6b4bf EB |
831 | if (unlikely(err)) { |
832 | skcipher_set_needkey(tfm); | |
f8d33fac | 833 | return err; |
b1f6b4bf | 834 | } |
9933e113 | 835 | |
f8d33fac EB |
836 | crypto_skcipher_clear_flags(tfm, CRYPTO_TFM_NEED_KEY); |
837 | return 0; | |
9933e113 HX |
838 | } |
839 | ||
81bcbb1e EB |
840 | int crypto_skcipher_encrypt(struct skcipher_request *req) |
841 | { | |
842 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
843 | struct crypto_alg *alg = tfm->base.__crt_alg; | |
844 | unsigned int cryptlen = req->cryptlen; | |
845 | int ret; | |
846 | ||
847 | crypto_stats_get(alg); | |
848 | if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) | |
849 | ret = -ENOKEY; | |
850 | else | |
851 | ret = tfm->encrypt(req); | |
852 | crypto_stats_skcipher_encrypt(cryptlen, ret, alg); | |
853 | return ret; | |
854 | } | |
855 | EXPORT_SYMBOL_GPL(crypto_skcipher_encrypt); | |
856 | ||
857 | int crypto_skcipher_decrypt(struct skcipher_request *req) | |
858 | { | |
859 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
860 | struct crypto_alg *alg = tfm->base.__crt_alg; | |
861 | unsigned int cryptlen = req->cryptlen; | |
862 | int ret; | |
863 | ||
864 | crypto_stats_get(alg); | |
865 | if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) | |
866 | ret = -ENOKEY; | |
867 | else | |
868 | ret = tfm->decrypt(req); | |
869 | crypto_stats_skcipher_decrypt(cryptlen, ret, alg); | |
870 | return ret; | |
871 | } | |
872 | EXPORT_SYMBOL_GPL(crypto_skcipher_decrypt); | |
873 | ||
4e6c3df4 HX |
874 | static void crypto_skcipher_exit_tfm(struct crypto_tfm *tfm) |
875 | { | |
876 | struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm); | |
877 | struct skcipher_alg *alg = crypto_skcipher_alg(skcipher); | |
878 | ||
879 | alg->exit(skcipher); | |
880 | } | |
881 | ||
7a7ffe65 HX |
882 | static int crypto_skcipher_init_tfm(struct crypto_tfm *tfm) |
883 | { | |
4e6c3df4 HX |
884 | struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm); |
885 | struct skcipher_alg *alg = crypto_skcipher_alg(skcipher); | |
886 | ||
7a7ffe65 HX |
887 | if (tfm->__crt_alg->cra_type == &crypto_blkcipher_type) |
888 | return crypto_init_skcipher_ops_blkcipher(tfm); | |
889 | ||
c79b411e | 890 | if (tfm->__crt_alg->cra_type == &crypto_ablkcipher_type) |
4e6c3df4 HX |
891 | return crypto_init_skcipher_ops_ablkcipher(tfm); |
892 | ||
9933e113 | 893 | skcipher->setkey = skcipher_setkey; |
4e6c3df4 HX |
894 | skcipher->encrypt = alg->encrypt; |
895 | skcipher->decrypt = alg->decrypt; | |
896 | skcipher->ivsize = alg->ivsize; | |
897 | skcipher->keysize = alg->max_keysize; | |
898 | ||
b1f6b4bf | 899 | skcipher_set_needkey(skcipher); |
f8d33fac | 900 | |
4e6c3df4 HX |
901 | if (alg->exit) |
902 | skcipher->base.exit = crypto_skcipher_exit_tfm; | |
7a7ffe65 | 903 | |
4e6c3df4 HX |
904 | if (alg->init) |
905 | return alg->init(skcipher); | |
906 | ||
907 | return 0; | |
908 | } | |
909 | ||
910 | static void crypto_skcipher_free_instance(struct crypto_instance *inst) | |
911 | { | |
912 | struct skcipher_instance *skcipher = | |
913 | container_of(inst, struct skcipher_instance, s.base); | |
914 | ||
915 | skcipher->free(skcipher); | |
916 | } | |
917 | ||
918 | static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg) | |
d8c34b94 | 919 | __maybe_unused; |
4e6c3df4 HX |
920 | static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg) |
921 | { | |
922 | struct skcipher_alg *skcipher = container_of(alg, struct skcipher_alg, | |
923 | base); | |
924 | ||
925 | seq_printf(m, "type : skcipher\n"); | |
926 | seq_printf(m, "async : %s\n", | |
927 | alg->cra_flags & CRYPTO_ALG_ASYNC ? "yes" : "no"); | |
928 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
929 | seq_printf(m, "min keysize : %u\n", skcipher->min_keysize); | |
930 | seq_printf(m, "max keysize : %u\n", skcipher->max_keysize); | |
931 | seq_printf(m, "ivsize : %u\n", skcipher->ivsize); | |
932 | seq_printf(m, "chunksize : %u\n", skcipher->chunksize); | |
c821f6ab | 933 | seq_printf(m, "walksize : %u\n", skcipher->walksize); |
7a7ffe65 HX |
934 | } |
935 | ||
4e6c3df4 HX |
936 | #ifdef CONFIG_NET |
937 | static int crypto_skcipher_report(struct sk_buff *skb, struct crypto_alg *alg) | |
938 | { | |
939 | struct crypto_report_blkcipher rblkcipher; | |
940 | struct skcipher_alg *skcipher = container_of(alg, struct skcipher_alg, | |
941 | base); | |
942 | ||
37db69e0 EB |
943 | memset(&rblkcipher, 0, sizeof(rblkcipher)); |
944 | ||
945 | strscpy(rblkcipher.type, "skcipher", sizeof(rblkcipher.type)); | |
946 | strscpy(rblkcipher.geniv, "<none>", sizeof(rblkcipher.geniv)); | |
4e6c3df4 HX |
947 | |
948 | rblkcipher.blocksize = alg->cra_blocksize; | |
949 | rblkcipher.min_keysize = skcipher->min_keysize; | |
950 | rblkcipher.max_keysize = skcipher->max_keysize; | |
951 | rblkcipher.ivsize = skcipher->ivsize; | |
952 | ||
37db69e0 EB |
953 | return nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER, |
954 | sizeof(rblkcipher), &rblkcipher); | |
4e6c3df4 HX |
955 | } |
956 | #else | |
957 | static int crypto_skcipher_report(struct sk_buff *skb, struct crypto_alg *alg) | |
958 | { | |
959 | return -ENOSYS; | |
960 | } | |
961 | #endif | |
962 | ||
7a7ffe65 HX |
963 | static const struct crypto_type crypto_skcipher_type2 = { |
964 | .extsize = crypto_skcipher_extsize, | |
965 | .init_tfm = crypto_skcipher_init_tfm, | |
4e6c3df4 HX |
966 | .free = crypto_skcipher_free_instance, |
967 | #ifdef CONFIG_PROC_FS | |
968 | .show = crypto_skcipher_show, | |
969 | #endif | |
970 | .report = crypto_skcipher_report, | |
7a7ffe65 HX |
971 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, |
972 | .maskset = CRYPTO_ALG_TYPE_BLKCIPHER_MASK, | |
4e6c3df4 | 973 | .type = CRYPTO_ALG_TYPE_SKCIPHER, |
7a7ffe65 HX |
974 | .tfmsize = offsetof(struct crypto_skcipher, base), |
975 | }; | |
976 | ||
3a01d0ee | 977 | int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, |
4e6c3df4 HX |
978 | const char *name, u32 type, u32 mask) |
979 | { | |
980 | spawn->base.frontend = &crypto_skcipher_type2; | |
981 | return crypto_grab_spawn(&spawn->base, name, type, mask); | |
982 | } | |
3a01d0ee | 983 | EXPORT_SYMBOL_GPL(crypto_grab_skcipher); |
4e6c3df4 | 984 | |
7a7ffe65 HX |
985 | struct crypto_skcipher *crypto_alloc_skcipher(const char *alg_name, |
986 | u32 type, u32 mask) | |
987 | { | |
988 | return crypto_alloc_tfm(alg_name, &crypto_skcipher_type2, type, mask); | |
989 | } | |
990 | EXPORT_SYMBOL_GPL(crypto_alloc_skcipher); | |
991 | ||
b350bee5 KC |
992 | struct crypto_sync_skcipher *crypto_alloc_sync_skcipher( |
993 | const char *alg_name, u32 type, u32 mask) | |
994 | { | |
995 | struct crypto_skcipher *tfm; | |
996 | ||
997 | /* Only sync algorithms allowed. */ | |
998 | mask |= CRYPTO_ALG_ASYNC; | |
999 | ||
1000 | tfm = crypto_alloc_tfm(alg_name, &crypto_skcipher_type2, type, mask); | |
1001 | ||
1002 | /* | |
1003 | * Make sure we do not allocate something that might get used with | |
1004 | * an on-stack request: check the request size. | |
1005 | */ | |
1006 | if (!IS_ERR(tfm) && WARN_ON(crypto_skcipher_reqsize(tfm) > | |
1007 | MAX_SYNC_SKCIPHER_REQSIZE)) { | |
1008 | crypto_free_skcipher(tfm); | |
1009 | return ERR_PTR(-EINVAL); | |
1010 | } | |
1011 | ||
1012 | return (struct crypto_sync_skcipher *)tfm; | |
1013 | } | |
1014 | EXPORT_SYMBOL_GPL(crypto_alloc_sync_skcipher); | |
1015 | ||
4e6c3df4 HX |
1016 | int crypto_has_skcipher2(const char *alg_name, u32 type, u32 mask) |
1017 | { | |
1018 | return crypto_type_has_alg(alg_name, &crypto_skcipher_type2, | |
1019 | type, mask); | |
1020 | } | |
1021 | EXPORT_SYMBOL_GPL(crypto_has_skcipher2); | |
1022 | ||
1023 | static int skcipher_prepare_alg(struct skcipher_alg *alg) | |
1024 | { | |
1025 | struct crypto_alg *base = &alg->base; | |
1026 | ||
c821f6ab AB |
1027 | if (alg->ivsize > PAGE_SIZE / 8 || alg->chunksize > PAGE_SIZE / 8 || |
1028 | alg->walksize > PAGE_SIZE / 8) | |
4e6c3df4 HX |
1029 | return -EINVAL; |
1030 | ||
1031 | if (!alg->chunksize) | |
1032 | alg->chunksize = base->cra_blocksize; | |
c821f6ab AB |
1033 | if (!alg->walksize) |
1034 | alg->walksize = alg->chunksize; | |
4e6c3df4 HX |
1035 | |
1036 | base->cra_type = &crypto_skcipher_type2; | |
1037 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; | |
1038 | base->cra_flags |= CRYPTO_ALG_TYPE_SKCIPHER; | |
1039 | ||
1040 | return 0; | |
1041 | } | |
1042 | ||
1043 | int crypto_register_skcipher(struct skcipher_alg *alg) | |
1044 | { | |
1045 | struct crypto_alg *base = &alg->base; | |
1046 | int err; | |
1047 | ||
1048 | err = skcipher_prepare_alg(alg); | |
1049 | if (err) | |
1050 | return err; | |
1051 | ||
1052 | return crypto_register_alg(base); | |
1053 | } | |
1054 | EXPORT_SYMBOL_GPL(crypto_register_skcipher); | |
1055 | ||
1056 | void crypto_unregister_skcipher(struct skcipher_alg *alg) | |
1057 | { | |
1058 | crypto_unregister_alg(&alg->base); | |
1059 | } | |
1060 | EXPORT_SYMBOL_GPL(crypto_unregister_skcipher); | |
1061 | ||
1062 | int crypto_register_skciphers(struct skcipher_alg *algs, int count) | |
1063 | { | |
1064 | int i, ret; | |
1065 | ||
1066 | for (i = 0; i < count; i++) { | |
1067 | ret = crypto_register_skcipher(&algs[i]); | |
1068 | if (ret) | |
1069 | goto err; | |
1070 | } | |
1071 | ||
1072 | return 0; | |
1073 | ||
1074 | err: | |
1075 | for (--i; i >= 0; --i) | |
1076 | crypto_unregister_skcipher(&algs[i]); | |
1077 | ||
1078 | return ret; | |
1079 | } | |
1080 | EXPORT_SYMBOL_GPL(crypto_register_skciphers); | |
1081 | ||
1082 | void crypto_unregister_skciphers(struct skcipher_alg *algs, int count) | |
1083 | { | |
1084 | int i; | |
1085 | ||
1086 | for (i = count - 1; i >= 0; --i) | |
1087 | crypto_unregister_skcipher(&algs[i]); | |
1088 | } | |
1089 | EXPORT_SYMBOL_GPL(crypto_unregister_skciphers); | |
1090 | ||
1091 | int skcipher_register_instance(struct crypto_template *tmpl, | |
1092 | struct skcipher_instance *inst) | |
1093 | { | |
1094 | int err; | |
1095 | ||
1096 | err = skcipher_prepare_alg(&inst->alg); | |
1097 | if (err) | |
1098 | return err; | |
1099 | ||
1100 | return crypto_register_instance(tmpl, skcipher_crypto_instance(inst)); | |
1101 | } | |
1102 | EXPORT_SYMBOL_GPL(skcipher_register_instance); | |
1103 | ||
0872da16 EB |
1104 | static int skcipher_setkey_simple(struct crypto_skcipher *tfm, const u8 *key, |
1105 | unsigned int keylen) | |
1106 | { | |
1107 | struct crypto_cipher *cipher = skcipher_cipher_simple(tfm); | |
1108 | int err; | |
1109 | ||
1110 | crypto_cipher_clear_flags(cipher, CRYPTO_TFM_REQ_MASK); | |
1111 | crypto_cipher_set_flags(cipher, crypto_skcipher_get_flags(tfm) & | |
1112 | CRYPTO_TFM_REQ_MASK); | |
1113 | err = crypto_cipher_setkey(cipher, key, keylen); | |
1114 | crypto_skcipher_set_flags(tfm, crypto_cipher_get_flags(cipher) & | |
1115 | CRYPTO_TFM_RES_MASK); | |
1116 | return err; | |
1117 | } | |
1118 | ||
1119 | static int skcipher_init_tfm_simple(struct crypto_skcipher *tfm) | |
1120 | { | |
1121 | struct skcipher_instance *inst = skcipher_alg_instance(tfm); | |
1122 | struct crypto_spawn *spawn = skcipher_instance_ctx(inst); | |
1123 | struct skcipher_ctx_simple *ctx = crypto_skcipher_ctx(tfm); | |
1124 | struct crypto_cipher *cipher; | |
1125 | ||
1126 | cipher = crypto_spawn_cipher(spawn); | |
1127 | if (IS_ERR(cipher)) | |
1128 | return PTR_ERR(cipher); | |
1129 | ||
1130 | ctx->cipher = cipher; | |
1131 | return 0; | |
1132 | } | |
1133 | ||
1134 | static void skcipher_exit_tfm_simple(struct crypto_skcipher *tfm) | |
1135 | { | |
1136 | struct skcipher_ctx_simple *ctx = crypto_skcipher_ctx(tfm); | |
1137 | ||
1138 | crypto_free_cipher(ctx->cipher); | |
1139 | } | |
1140 | ||
1141 | static void skcipher_free_instance_simple(struct skcipher_instance *inst) | |
1142 | { | |
1143 | crypto_drop_spawn(skcipher_instance_ctx(inst)); | |
1144 | kfree(inst); | |
1145 | } | |
1146 | ||
1147 | /** | |
1148 | * skcipher_alloc_instance_simple - allocate instance of simple block cipher mode | |
1149 | * | |
1150 | * Allocate an skcipher_instance for a simple block cipher mode of operation, | |
1151 | * e.g. cbc or ecb. The instance context will have just a single crypto_spawn, | |
1152 | * that for the underlying cipher. The {min,max}_keysize, ivsize, blocksize, | |
1153 | * alignmask, and priority are set from the underlying cipher but can be | |
1154 | * overridden if needed. The tfm context defaults to skcipher_ctx_simple, and | |
1155 | * default ->setkey(), ->init(), and ->exit() methods are installed. | |
1156 | * | |
1157 | * @tmpl: the template being instantiated | |
1158 | * @tb: the template parameters | |
1159 | * @cipher_alg_ret: on success, a pointer to the underlying cipher algorithm is | |
1160 | * returned here. It must be dropped with crypto_mod_put(). | |
1161 | * | |
1162 | * Return: a pointer to the new instance, or an ERR_PTR(). The caller still | |
1163 | * needs to register the instance. | |
1164 | */ | |
1165 | struct skcipher_instance * | |
1166 | skcipher_alloc_instance_simple(struct crypto_template *tmpl, struct rtattr **tb, | |
1167 | struct crypto_alg **cipher_alg_ret) | |
1168 | { | |
1169 | struct crypto_attr_type *algt; | |
1170 | struct crypto_alg *cipher_alg; | |
1171 | struct skcipher_instance *inst; | |
1172 | struct crypto_spawn *spawn; | |
1173 | u32 mask; | |
1174 | int err; | |
1175 | ||
1176 | algt = crypto_get_attr_type(tb); | |
1177 | if (IS_ERR(algt)) | |
1178 | return ERR_CAST(algt); | |
1179 | ||
1180 | if ((algt->type ^ CRYPTO_ALG_TYPE_SKCIPHER) & algt->mask) | |
1181 | return ERR_PTR(-EINVAL); | |
1182 | ||
1183 | mask = CRYPTO_ALG_TYPE_MASK | | |
1184 | crypto_requires_off(algt->type, algt->mask, | |
1185 | CRYPTO_ALG_NEED_FALLBACK); | |
1186 | ||
1187 | cipher_alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER, mask); | |
1188 | if (IS_ERR(cipher_alg)) | |
1189 | return ERR_CAST(cipher_alg); | |
1190 | ||
1191 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); | |
1192 | if (!inst) { | |
1193 | err = -ENOMEM; | |
1194 | goto err_put_cipher_alg; | |
1195 | } | |
1196 | spawn = skcipher_instance_ctx(inst); | |
1197 | ||
1198 | err = crypto_inst_setname(skcipher_crypto_instance(inst), tmpl->name, | |
1199 | cipher_alg); | |
1200 | if (err) | |
1201 | goto err_free_inst; | |
1202 | ||
1203 | err = crypto_init_spawn(spawn, cipher_alg, | |
1204 | skcipher_crypto_instance(inst), | |
1205 | CRYPTO_ALG_TYPE_MASK); | |
1206 | if (err) | |
1207 | goto err_free_inst; | |
1208 | inst->free = skcipher_free_instance_simple; | |
1209 | ||
1210 | /* Default algorithm properties, can be overridden */ | |
1211 | inst->alg.base.cra_blocksize = cipher_alg->cra_blocksize; | |
1212 | inst->alg.base.cra_alignmask = cipher_alg->cra_alignmask; | |
1213 | inst->alg.base.cra_priority = cipher_alg->cra_priority; | |
1214 | inst->alg.min_keysize = cipher_alg->cra_cipher.cia_min_keysize; | |
1215 | inst->alg.max_keysize = cipher_alg->cra_cipher.cia_max_keysize; | |
1216 | inst->alg.ivsize = cipher_alg->cra_blocksize; | |
1217 | ||
1218 | /* Use skcipher_ctx_simple by default, can be overridden */ | |
1219 | inst->alg.base.cra_ctxsize = sizeof(struct skcipher_ctx_simple); | |
1220 | inst->alg.setkey = skcipher_setkey_simple; | |
1221 | inst->alg.init = skcipher_init_tfm_simple; | |
1222 | inst->alg.exit = skcipher_exit_tfm_simple; | |
1223 | ||
1224 | *cipher_alg_ret = cipher_alg; | |
1225 | return inst; | |
1226 | ||
1227 | err_free_inst: | |
1228 | kfree(inst); | |
1229 | err_put_cipher_alg: | |
1230 | crypto_mod_put(cipher_alg); | |
1231 | return ERR_PTR(err); | |
1232 | } | |
1233 | EXPORT_SYMBOL_GPL(skcipher_alloc_instance_simple); | |
1234 | ||
7a7ffe65 HX |
1235 | MODULE_LICENSE("GPL"); |
1236 | MODULE_DESCRIPTION("Symmetric key cipher type"); |