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 | ||
8088d3dd | 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 | { | |
8088d3dd 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)) { | |
dcaca01a EB |
134 | if (err) { |
135 | /* | |
136 | * Didn't process all bytes. Either the algorithm is | |
137 | * broken, or this was the last step and it turned out | |
138 | * the message wasn't evenly divisible into blocks but | |
139 | * the algorithm requires it. | |
140 | */ | |
b286d8b1 | 141 | err = -EINVAL; |
8088d3dd EB |
142 | goto finish; |
143 | } | |
144 | skcipher_done_slow(walk, n); | |
145 | goto already_advanced; | |
b286d8b1 HX |
146 | } |
147 | ||
b286d8b1 HX |
148 | scatterwalk_advance(&walk->in, n); |
149 | scatterwalk_advance(&walk->out, n); | |
8088d3dd EB |
150 | already_advanced: |
151 | scatterwalk_done(&walk->in, 0, more); | |
152 | scatterwalk_done(&walk->out, 1, more); | |
b286d8b1 | 153 | |
8088d3dd | 154 | if (more) { |
b286d8b1 HX |
155 | crypto_yield(walk->flags & SKCIPHER_WALK_SLEEP ? |
156 | CRYPTO_TFM_REQ_MAY_SLEEP : 0); | |
157 | return skcipher_walk_next(walk); | |
158 | } | |
8088d3dd EB |
159 | err = 0; |
160 | finish: | |
161 | walk->nbytes = 0; | |
b286d8b1 HX |
162 | |
163 | /* Short-circuit for the common/fast path. */ | |
164 | if (!((unsigned long)walk->buffer | (unsigned long)walk->page)) | |
165 | goto out; | |
166 | ||
167 | if (walk->flags & SKCIPHER_WALK_PHYS) | |
168 | goto out; | |
169 | ||
170 | if (walk->iv != walk->oiv) | |
171 | memcpy(walk->oiv, walk->iv, walk->ivsize); | |
172 | if (walk->buffer != walk->page) | |
173 | kfree(walk->buffer); | |
174 | if (walk->page) | |
175 | free_page((unsigned long)walk->page); | |
176 | ||
177 | out: | |
178 | return err; | |
179 | } | |
180 | EXPORT_SYMBOL_GPL(skcipher_walk_done); | |
181 | ||
182 | void skcipher_walk_complete(struct skcipher_walk *walk, int err) | |
183 | { | |
184 | struct skcipher_walk_buffer *p, *tmp; | |
185 | ||
186 | list_for_each_entry_safe(p, tmp, &walk->buffers, entry) { | |
187 | u8 *data; | |
188 | ||
189 | if (err) | |
190 | goto done; | |
191 | ||
192 | data = p->data; | |
193 | if (!data) { | |
194 | data = PTR_ALIGN(&p->buffer[0], walk->alignmask + 1); | |
c821f6ab | 195 | data = skcipher_get_spot(data, walk->stride); |
b286d8b1 HX |
196 | } |
197 | ||
198 | scatterwalk_copychunks(data, &p->dst, p->len, 1); | |
199 | ||
c821f6ab | 200 | if (offset_in_page(p->data) + p->len + walk->stride > |
b286d8b1 HX |
201 | PAGE_SIZE) |
202 | free_page((unsigned long)p->data); | |
203 | ||
204 | done: | |
205 | list_del(&p->entry); | |
206 | kfree(p); | |
207 | } | |
208 | ||
209 | if (!err && walk->iv != walk->oiv) | |
210 | memcpy(walk->oiv, walk->iv, walk->ivsize); | |
211 | if (walk->buffer != walk->page) | |
212 | kfree(walk->buffer); | |
213 | if (walk->page) | |
214 | free_page((unsigned long)walk->page); | |
215 | } | |
216 | EXPORT_SYMBOL_GPL(skcipher_walk_complete); | |
217 | ||
218 | static void skcipher_queue_write(struct skcipher_walk *walk, | |
219 | struct skcipher_walk_buffer *p) | |
220 | { | |
221 | p->dst = walk->out; | |
222 | list_add_tail(&p->entry, &walk->buffers); | |
223 | } | |
224 | ||
225 | static int skcipher_next_slow(struct skcipher_walk *walk, unsigned int bsize) | |
226 | { | |
227 | bool phys = walk->flags & SKCIPHER_WALK_PHYS; | |
228 | unsigned alignmask = walk->alignmask; | |
229 | struct skcipher_walk_buffer *p; | |
230 | unsigned a; | |
231 | unsigned n; | |
232 | u8 *buffer; | |
233 | void *v; | |
234 | ||
235 | if (!phys) { | |
18e615ad AB |
236 | if (!walk->buffer) |
237 | walk->buffer = walk->page; | |
238 | buffer = walk->buffer; | |
b286d8b1 HX |
239 | if (buffer) |
240 | goto ok; | |
241 | } | |
242 | ||
243 | /* Start with the minimum alignment of kmalloc. */ | |
244 | a = crypto_tfm_ctx_alignment() - 1; | |
245 | n = bsize; | |
246 | ||
247 | if (phys) { | |
248 | /* Calculate the minimum alignment of p->buffer. */ | |
249 | a &= (sizeof(*p) ^ (sizeof(*p) - 1)) >> 1; | |
250 | n += sizeof(*p); | |
251 | } | |
252 | ||
253 | /* Minimum size to align p->buffer by alignmask. */ | |
254 | n += alignmask & ~a; | |
255 | ||
256 | /* Minimum size to ensure p->buffer does not straddle a page. */ | |
257 | n += (bsize - 1) & ~(alignmask | a); | |
258 | ||
259 | v = kzalloc(n, skcipher_walk_gfp(walk)); | |
260 | if (!v) | |
261 | return skcipher_walk_done(walk, -ENOMEM); | |
262 | ||
263 | if (phys) { | |
264 | p = v; | |
265 | p->len = bsize; | |
266 | skcipher_queue_write(walk, p); | |
267 | buffer = p->buffer; | |
268 | } else { | |
269 | walk->buffer = v; | |
270 | buffer = v; | |
271 | } | |
272 | ||
273 | ok: | |
274 | walk->dst.virt.addr = PTR_ALIGN(buffer, alignmask + 1); | |
275 | walk->dst.virt.addr = skcipher_get_spot(walk->dst.virt.addr, bsize); | |
276 | walk->src.virt.addr = walk->dst.virt.addr; | |
277 | ||
278 | scatterwalk_copychunks(walk->src.virt.addr, &walk->in, bsize, 0); | |
279 | ||
280 | walk->nbytes = bsize; | |
281 | walk->flags |= SKCIPHER_WALK_SLOW; | |
282 | ||
283 | return 0; | |
284 | } | |
285 | ||
286 | static int skcipher_next_copy(struct skcipher_walk *walk) | |
287 | { | |
288 | struct skcipher_walk_buffer *p; | |
289 | u8 *tmp = walk->page; | |
290 | ||
291 | skcipher_map_src(walk); | |
292 | memcpy(tmp, walk->src.virt.addr, walk->nbytes); | |
293 | skcipher_unmap_src(walk); | |
294 | ||
295 | walk->src.virt.addr = tmp; | |
296 | walk->dst.virt.addr = tmp; | |
297 | ||
298 | if (!(walk->flags & SKCIPHER_WALK_PHYS)) | |
299 | return 0; | |
300 | ||
301 | p = kmalloc(sizeof(*p), skcipher_walk_gfp(walk)); | |
302 | if (!p) | |
303 | return -ENOMEM; | |
304 | ||
305 | p->data = walk->page; | |
306 | p->len = walk->nbytes; | |
307 | skcipher_queue_write(walk, p); | |
308 | ||
c821f6ab | 309 | if (offset_in_page(walk->page) + walk->nbytes + walk->stride > |
b286d8b1 HX |
310 | PAGE_SIZE) |
311 | walk->page = NULL; | |
312 | else | |
313 | walk->page += walk->nbytes; | |
314 | ||
315 | return 0; | |
316 | } | |
317 | ||
318 | static int skcipher_next_fast(struct skcipher_walk *walk) | |
319 | { | |
320 | unsigned long diff; | |
321 | ||
322 | walk->src.phys.page = scatterwalk_page(&walk->in); | |
323 | walk->src.phys.offset = offset_in_page(walk->in.offset); | |
324 | walk->dst.phys.page = scatterwalk_page(&walk->out); | |
325 | walk->dst.phys.offset = offset_in_page(walk->out.offset); | |
326 | ||
327 | if (walk->flags & SKCIPHER_WALK_PHYS) | |
328 | return 0; | |
329 | ||
330 | diff = walk->src.phys.offset - walk->dst.phys.offset; | |
331 | diff |= walk->src.virt.page - walk->dst.virt.page; | |
332 | ||
333 | skcipher_map_src(walk); | |
334 | walk->dst.virt.addr = walk->src.virt.addr; | |
335 | ||
336 | if (diff) { | |
337 | walk->flags |= SKCIPHER_WALK_DIFF; | |
338 | skcipher_map_dst(walk); | |
339 | } | |
340 | ||
341 | return 0; | |
342 | } | |
343 | ||
344 | static int skcipher_walk_next(struct skcipher_walk *walk) | |
345 | { | |
346 | unsigned int bsize; | |
347 | unsigned int n; | |
348 | int err; | |
349 | ||
350 | walk->flags &= ~(SKCIPHER_WALK_SLOW | SKCIPHER_WALK_COPY | | |
351 | SKCIPHER_WALK_DIFF); | |
352 | ||
353 | n = walk->total; | |
c821f6ab | 354 | bsize = min(walk->stride, max(n, walk->blocksize)); |
b286d8b1 HX |
355 | n = scatterwalk_clamp(&walk->in, n); |
356 | n = scatterwalk_clamp(&walk->out, n); | |
357 | ||
358 | if (unlikely(n < bsize)) { | |
359 | if (unlikely(walk->total < walk->blocksize)) | |
360 | return skcipher_walk_done(walk, -EINVAL); | |
361 | ||
362 | slow_path: | |
363 | err = skcipher_next_slow(walk, bsize); | |
364 | goto set_phys_lowmem; | |
365 | } | |
366 | ||
367 | if (unlikely((walk->in.offset | walk->out.offset) & walk->alignmask)) { | |
368 | if (!walk->page) { | |
369 | gfp_t gfp = skcipher_walk_gfp(walk); | |
370 | ||
371 | walk->page = (void *)__get_free_page(gfp); | |
372 | if (!walk->page) | |
373 | goto slow_path; | |
374 | } | |
375 | ||
376 | walk->nbytes = min_t(unsigned, n, | |
377 | PAGE_SIZE - offset_in_page(walk->page)); | |
378 | walk->flags |= SKCIPHER_WALK_COPY; | |
379 | err = skcipher_next_copy(walk); | |
380 | goto set_phys_lowmem; | |
381 | } | |
382 | ||
383 | walk->nbytes = n; | |
384 | ||
385 | return skcipher_next_fast(walk); | |
386 | ||
387 | set_phys_lowmem: | |
388 | if (!err && (walk->flags & SKCIPHER_WALK_PHYS)) { | |
389 | walk->src.phys.page = virt_to_page(walk->src.virt.addr); | |
390 | walk->dst.phys.page = virt_to_page(walk->dst.virt.addr); | |
391 | walk->src.phys.offset &= PAGE_SIZE - 1; | |
392 | walk->dst.phys.offset &= PAGE_SIZE - 1; | |
393 | } | |
394 | return err; | |
395 | } | |
b286d8b1 HX |
396 | |
397 | static int skcipher_copy_iv(struct skcipher_walk *walk) | |
398 | { | |
399 | unsigned a = crypto_tfm_ctx_alignment() - 1; | |
400 | unsigned alignmask = walk->alignmask; | |
401 | unsigned ivsize = walk->ivsize; | |
c821f6ab | 402 | unsigned bs = walk->stride; |
b286d8b1 HX |
403 | unsigned aligned_bs; |
404 | unsigned size; | |
405 | u8 *iv; | |
406 | ||
0567fc9e | 407 | aligned_bs = ALIGN(bs, alignmask + 1); |
b286d8b1 HX |
408 | |
409 | /* Minimum size to align buffer by alignmask. */ | |
410 | size = alignmask & ~a; | |
411 | ||
412 | if (walk->flags & SKCIPHER_WALK_PHYS) | |
413 | size += ivsize; | |
414 | else { | |
415 | size += aligned_bs + ivsize; | |
416 | ||
417 | /* Minimum size to ensure buffer does not straddle a page. */ | |
418 | size += (bs - 1) & ~(alignmask | a); | |
419 | } | |
420 | ||
421 | walk->buffer = kmalloc(size, skcipher_walk_gfp(walk)); | |
422 | if (!walk->buffer) | |
423 | return -ENOMEM; | |
424 | ||
425 | iv = PTR_ALIGN(walk->buffer, alignmask + 1); | |
426 | iv = skcipher_get_spot(iv, bs) + aligned_bs; | |
427 | ||
428 | walk->iv = memcpy(iv, walk->iv, walk->ivsize); | |
429 | return 0; | |
430 | } | |
431 | ||
432 | static int skcipher_walk_first(struct skcipher_walk *walk) | |
433 | { | |
b286d8b1 HX |
434 | if (WARN_ON_ONCE(in_irq())) |
435 | return -EDEADLK; | |
436 | ||
b286d8b1 HX |
437 | walk->buffer = NULL; |
438 | if (unlikely(((unsigned long)walk->iv & walk->alignmask))) { | |
439 | int err = skcipher_copy_iv(walk); | |
440 | if (err) | |
441 | return err; | |
442 | } | |
443 | ||
444 | walk->page = NULL; | |
b286d8b1 HX |
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 | ||
0cabf2af HX |
454 | walk->total = req->cryptlen; |
455 | walk->nbytes = 0; | |
2b4f27c3 EB |
456 | walk->iv = req->iv; |
457 | walk->oiv = req->iv; | |
0cabf2af HX |
458 | |
459 | if (unlikely(!walk->total)) | |
460 | return 0; | |
461 | ||
b286d8b1 HX |
462 | scatterwalk_start(&walk->in, req->src); |
463 | scatterwalk_start(&walk->out, req->dst); | |
464 | ||
b286d8b1 HX |
465 | walk->flags &= ~SKCIPHER_WALK_SLEEP; |
466 | walk->flags |= req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? | |
467 | SKCIPHER_WALK_SLEEP : 0; | |
468 | ||
469 | walk->blocksize = crypto_skcipher_blocksize(tfm); | |
c821f6ab | 470 | walk->stride = crypto_skcipher_walksize(tfm); |
b286d8b1 HX |
471 | walk->ivsize = crypto_skcipher_ivsize(tfm); |
472 | walk->alignmask = crypto_skcipher_alignmask(tfm); | |
473 | ||
474 | return skcipher_walk_first(walk); | |
475 | } | |
476 | ||
477 | int skcipher_walk_virt(struct skcipher_walk *walk, | |
478 | struct skcipher_request *req, bool atomic) | |
479 | { | |
480 | int err; | |
481 | ||
bb648291 EB |
482 | might_sleep_if(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP); |
483 | ||
b286d8b1 HX |
484 | walk->flags &= ~SKCIPHER_WALK_PHYS; |
485 | ||
486 | err = skcipher_walk_skcipher(walk, req); | |
487 | ||
488 | walk->flags &= atomic ? ~SKCIPHER_WALK_SLEEP : ~0; | |
489 | ||
490 | return err; | |
491 | } | |
492 | EXPORT_SYMBOL_GPL(skcipher_walk_virt); | |
493 | ||
494 | void skcipher_walk_atomise(struct skcipher_walk *walk) | |
495 | { | |
496 | walk->flags &= ~SKCIPHER_WALK_SLEEP; | |
497 | } | |
498 | EXPORT_SYMBOL_GPL(skcipher_walk_atomise); | |
499 | ||
500 | int skcipher_walk_async(struct skcipher_walk *walk, | |
501 | struct skcipher_request *req) | |
502 | { | |
503 | walk->flags |= SKCIPHER_WALK_PHYS; | |
504 | ||
505 | INIT_LIST_HEAD(&walk->buffers); | |
506 | ||
507 | return skcipher_walk_skcipher(walk, req); | |
508 | } | |
509 | EXPORT_SYMBOL_GPL(skcipher_walk_async); | |
510 | ||
34bc085c HX |
511 | static int skcipher_walk_aead_common(struct skcipher_walk *walk, |
512 | struct aead_request *req, bool atomic) | |
b286d8b1 HX |
513 | { |
514 | struct crypto_aead *tfm = crypto_aead_reqtfm(req); | |
515 | int err; | |
516 | ||
0cabf2af | 517 | walk->nbytes = 0; |
2b4f27c3 EB |
518 | walk->iv = req->iv; |
519 | walk->oiv = req->iv; | |
0cabf2af HX |
520 | |
521 | if (unlikely(!walk->total)) | |
522 | return 0; | |
523 | ||
3cbf61fb AB |
524 | walk->flags &= ~SKCIPHER_WALK_PHYS; |
525 | ||
b286d8b1 HX |
526 | scatterwalk_start(&walk->in, req->src); |
527 | scatterwalk_start(&walk->out, req->dst); | |
528 | ||
529 | scatterwalk_copychunks(NULL, &walk->in, req->assoclen, 2); | |
530 | scatterwalk_copychunks(NULL, &walk->out, req->assoclen, 2); | |
531 | ||
c14ca838 OM |
532 | scatterwalk_done(&walk->in, 0, walk->total); |
533 | scatterwalk_done(&walk->out, 0, walk->total); | |
534 | ||
b286d8b1 HX |
535 | if (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) |
536 | walk->flags |= SKCIPHER_WALK_SLEEP; | |
537 | else | |
538 | walk->flags &= ~SKCIPHER_WALK_SLEEP; | |
539 | ||
540 | walk->blocksize = crypto_aead_blocksize(tfm); | |
c821f6ab | 541 | walk->stride = crypto_aead_chunksize(tfm); |
b286d8b1 HX |
542 | walk->ivsize = crypto_aead_ivsize(tfm); |
543 | walk->alignmask = crypto_aead_alignmask(tfm); | |
544 | ||
545 | err = skcipher_walk_first(walk); | |
546 | ||
547 | if (atomic) | |
548 | walk->flags &= ~SKCIPHER_WALK_SLEEP; | |
549 | ||
550 | return err; | |
551 | } | |
34bc085c HX |
552 | |
553 | int skcipher_walk_aead(struct skcipher_walk *walk, struct aead_request *req, | |
554 | bool atomic) | |
555 | { | |
556 | walk->total = req->cryptlen; | |
557 | ||
558 | return skcipher_walk_aead_common(walk, req, atomic); | |
559 | } | |
b286d8b1 HX |
560 | EXPORT_SYMBOL_GPL(skcipher_walk_aead); |
561 | ||
34bc085c HX |
562 | int skcipher_walk_aead_encrypt(struct skcipher_walk *walk, |
563 | struct aead_request *req, bool atomic) | |
564 | { | |
565 | walk->total = req->cryptlen; | |
566 | ||
567 | return skcipher_walk_aead_common(walk, req, atomic); | |
568 | } | |
569 | EXPORT_SYMBOL_GPL(skcipher_walk_aead_encrypt); | |
570 | ||
571 | int skcipher_walk_aead_decrypt(struct skcipher_walk *walk, | |
572 | struct aead_request *req, bool atomic) | |
573 | { | |
574 | struct crypto_aead *tfm = crypto_aead_reqtfm(req); | |
575 | ||
576 | walk->total = req->cryptlen - crypto_aead_authsize(tfm); | |
577 | ||
578 | return skcipher_walk_aead_common(walk, req, atomic); | |
579 | } | |
580 | EXPORT_SYMBOL_GPL(skcipher_walk_aead_decrypt); | |
581 | ||
7a7ffe65 HX |
582 | static unsigned int crypto_skcipher_extsize(struct crypto_alg *alg) |
583 | { | |
584 | if (alg->cra_type == &crypto_blkcipher_type) | |
585 | return sizeof(struct crypto_blkcipher *); | |
586 | ||
c79b411e | 587 | if (alg->cra_type == &crypto_ablkcipher_type) |
4e6c3df4 | 588 | return sizeof(struct crypto_ablkcipher *); |
7a7ffe65 | 589 | |
4e6c3df4 | 590 | return crypto_alg_extsize(alg); |
7a7ffe65 HX |
591 | } |
592 | ||
b1f6b4bf EB |
593 | static void skcipher_set_needkey(struct crypto_skcipher *tfm) |
594 | { | |
595 | if (tfm->keysize) | |
596 | crypto_skcipher_set_flags(tfm, CRYPTO_TFM_NEED_KEY); | |
597 | } | |
598 | ||
7a7ffe65 HX |
599 | static int skcipher_setkey_blkcipher(struct crypto_skcipher *tfm, |
600 | const u8 *key, unsigned int keylen) | |
601 | { | |
602 | struct crypto_blkcipher **ctx = crypto_skcipher_ctx(tfm); | |
603 | struct crypto_blkcipher *blkcipher = *ctx; | |
604 | int err; | |
605 | ||
606 | crypto_blkcipher_clear_flags(blkcipher, ~0); | |
607 | crypto_blkcipher_set_flags(blkcipher, crypto_skcipher_get_flags(tfm) & | |
608 | CRYPTO_TFM_REQ_MASK); | |
609 | err = crypto_blkcipher_setkey(blkcipher, key, keylen); | |
610 | crypto_skcipher_set_flags(tfm, crypto_blkcipher_get_flags(blkcipher) & | |
611 | CRYPTO_TFM_RES_MASK); | |
b1f6b4bf EB |
612 | if (unlikely(err)) { |
613 | skcipher_set_needkey(tfm); | |
f8d33fac | 614 | return err; |
b1f6b4bf | 615 | } |
7a7ffe65 | 616 | |
f8d33fac EB |
617 | crypto_skcipher_clear_flags(tfm, CRYPTO_TFM_NEED_KEY); |
618 | return 0; | |
7a7ffe65 HX |
619 | } |
620 | ||
621 | static int skcipher_crypt_blkcipher(struct skcipher_request *req, | |
622 | int (*crypt)(struct blkcipher_desc *, | |
623 | struct scatterlist *, | |
624 | struct scatterlist *, | |
625 | unsigned int)) | |
626 | { | |
627 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
628 | struct crypto_blkcipher **ctx = crypto_skcipher_ctx(tfm); | |
629 | struct blkcipher_desc desc = { | |
630 | .tfm = *ctx, | |
631 | .info = req->iv, | |
632 | .flags = req->base.flags, | |
633 | }; | |
634 | ||
635 | ||
636 | return crypt(&desc, req->dst, req->src, req->cryptlen); | |
637 | } | |
638 | ||
639 | static int skcipher_encrypt_blkcipher(struct skcipher_request *req) | |
640 | { | |
641 | struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); | |
642 | struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher); | |
643 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; | |
644 | ||
645 | return skcipher_crypt_blkcipher(req, alg->encrypt); | |
646 | } | |
647 | ||
648 | static int skcipher_decrypt_blkcipher(struct skcipher_request *req) | |
649 | { | |
650 | struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); | |
651 | struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher); | |
652 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; | |
653 | ||
654 | return skcipher_crypt_blkcipher(req, alg->decrypt); | |
655 | } | |
656 | ||
657 | static void crypto_exit_skcipher_ops_blkcipher(struct crypto_tfm *tfm) | |
658 | { | |
659 | struct crypto_blkcipher **ctx = crypto_tfm_ctx(tfm); | |
660 | ||
661 | crypto_free_blkcipher(*ctx); | |
662 | } | |
663 | ||
ecdd6bed | 664 | static int crypto_init_skcipher_ops_blkcipher(struct crypto_tfm *tfm) |
7a7ffe65 HX |
665 | { |
666 | struct crypto_alg *calg = tfm->__crt_alg; | |
667 | struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm); | |
668 | struct crypto_blkcipher **ctx = crypto_tfm_ctx(tfm); | |
669 | struct crypto_blkcipher *blkcipher; | |
670 | struct crypto_tfm *btfm; | |
671 | ||
672 | if (!crypto_mod_get(calg)) | |
673 | return -EAGAIN; | |
674 | ||
675 | btfm = __crypto_alloc_tfm(calg, CRYPTO_ALG_TYPE_BLKCIPHER, | |
676 | CRYPTO_ALG_TYPE_MASK); | |
677 | if (IS_ERR(btfm)) { | |
678 | crypto_mod_put(calg); | |
679 | return PTR_ERR(btfm); | |
680 | } | |
681 | ||
682 | blkcipher = __crypto_blkcipher_cast(btfm); | |
683 | *ctx = blkcipher; | |
684 | tfm->exit = crypto_exit_skcipher_ops_blkcipher; | |
685 | ||
686 | skcipher->setkey = skcipher_setkey_blkcipher; | |
687 | skcipher->encrypt = skcipher_encrypt_blkcipher; | |
688 | skcipher->decrypt = skcipher_decrypt_blkcipher; | |
689 | ||
690 | skcipher->ivsize = crypto_blkcipher_ivsize(blkcipher); | |
973fb3fb | 691 | skcipher->keysize = calg->cra_blkcipher.max_keysize; |
7a7ffe65 | 692 | |
b1f6b4bf | 693 | skcipher_set_needkey(skcipher); |
f8d33fac | 694 | |
7a7ffe65 HX |
695 | return 0; |
696 | } | |
697 | ||
698 | static int skcipher_setkey_ablkcipher(struct crypto_skcipher *tfm, | |
699 | const u8 *key, unsigned int keylen) | |
700 | { | |
701 | struct crypto_ablkcipher **ctx = crypto_skcipher_ctx(tfm); | |
702 | struct crypto_ablkcipher *ablkcipher = *ctx; | |
703 | int err; | |
704 | ||
705 | crypto_ablkcipher_clear_flags(ablkcipher, ~0); | |
706 | crypto_ablkcipher_set_flags(ablkcipher, | |
707 | crypto_skcipher_get_flags(tfm) & | |
708 | CRYPTO_TFM_REQ_MASK); | |
709 | err = crypto_ablkcipher_setkey(ablkcipher, key, keylen); | |
710 | crypto_skcipher_set_flags(tfm, | |
711 | crypto_ablkcipher_get_flags(ablkcipher) & | |
712 | CRYPTO_TFM_RES_MASK); | |
b1f6b4bf EB |
713 | if (unlikely(err)) { |
714 | skcipher_set_needkey(tfm); | |
f8d33fac | 715 | return err; |
b1f6b4bf | 716 | } |
7a7ffe65 | 717 | |
f8d33fac EB |
718 | crypto_skcipher_clear_flags(tfm, CRYPTO_TFM_NEED_KEY); |
719 | return 0; | |
7a7ffe65 HX |
720 | } |
721 | ||
722 | static int skcipher_crypt_ablkcipher(struct skcipher_request *req, | |
723 | int (*crypt)(struct ablkcipher_request *)) | |
724 | { | |
725 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
726 | struct crypto_ablkcipher **ctx = crypto_skcipher_ctx(tfm); | |
727 | struct ablkcipher_request *subreq = skcipher_request_ctx(req); | |
728 | ||
729 | ablkcipher_request_set_tfm(subreq, *ctx); | |
730 | ablkcipher_request_set_callback(subreq, skcipher_request_flags(req), | |
731 | req->base.complete, req->base.data); | |
732 | ablkcipher_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, | |
733 | req->iv); | |
734 | ||
735 | return crypt(subreq); | |
736 | } | |
737 | ||
738 | static int skcipher_encrypt_ablkcipher(struct skcipher_request *req) | |
739 | { | |
740 | struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); | |
741 | struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher); | |
742 | struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher; | |
743 | ||
744 | return skcipher_crypt_ablkcipher(req, alg->encrypt); | |
745 | } | |
746 | ||
747 | static int skcipher_decrypt_ablkcipher(struct skcipher_request *req) | |
748 | { | |
749 | struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); | |
750 | struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher); | |
751 | struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher; | |
752 | ||
753 | return skcipher_crypt_ablkcipher(req, alg->decrypt); | |
754 | } | |
755 | ||
756 | static void crypto_exit_skcipher_ops_ablkcipher(struct crypto_tfm *tfm) | |
757 | { | |
758 | struct crypto_ablkcipher **ctx = crypto_tfm_ctx(tfm); | |
759 | ||
760 | crypto_free_ablkcipher(*ctx); | |
761 | } | |
762 | ||
ecdd6bed | 763 | static int crypto_init_skcipher_ops_ablkcipher(struct crypto_tfm *tfm) |
7a7ffe65 HX |
764 | { |
765 | struct crypto_alg *calg = tfm->__crt_alg; | |
766 | struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm); | |
767 | struct crypto_ablkcipher **ctx = crypto_tfm_ctx(tfm); | |
768 | struct crypto_ablkcipher *ablkcipher; | |
769 | struct crypto_tfm *abtfm; | |
770 | ||
771 | if (!crypto_mod_get(calg)) | |
772 | return -EAGAIN; | |
773 | ||
774 | abtfm = __crypto_alloc_tfm(calg, 0, 0); | |
775 | if (IS_ERR(abtfm)) { | |
776 | crypto_mod_put(calg); | |
777 | return PTR_ERR(abtfm); | |
778 | } | |
779 | ||
780 | ablkcipher = __crypto_ablkcipher_cast(abtfm); | |
781 | *ctx = ablkcipher; | |
782 | tfm->exit = crypto_exit_skcipher_ops_ablkcipher; | |
783 | ||
784 | skcipher->setkey = skcipher_setkey_ablkcipher; | |
785 | skcipher->encrypt = skcipher_encrypt_ablkcipher; | |
786 | skcipher->decrypt = skcipher_decrypt_ablkcipher; | |
787 | ||
788 | skcipher->ivsize = crypto_ablkcipher_ivsize(ablkcipher); | |
789 | skcipher->reqsize = crypto_ablkcipher_reqsize(ablkcipher) + | |
790 | sizeof(struct ablkcipher_request); | |
973fb3fb | 791 | skcipher->keysize = calg->cra_ablkcipher.max_keysize; |
7a7ffe65 | 792 | |
b1f6b4bf | 793 | skcipher_set_needkey(skcipher); |
f8d33fac | 794 | |
7a7ffe65 HX |
795 | return 0; |
796 | } | |
797 | ||
9933e113 HX |
798 | static int skcipher_setkey_unaligned(struct crypto_skcipher *tfm, |
799 | const u8 *key, unsigned int keylen) | |
800 | { | |
801 | unsigned long alignmask = crypto_skcipher_alignmask(tfm); | |
802 | struct skcipher_alg *cipher = crypto_skcipher_alg(tfm); | |
803 | u8 *buffer, *alignbuffer; | |
804 | unsigned long absize; | |
805 | int ret; | |
806 | ||
807 | absize = keylen + alignmask; | |
808 | buffer = kmalloc(absize, GFP_ATOMIC); | |
809 | if (!buffer) | |
810 | return -ENOMEM; | |
811 | ||
812 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
813 | memcpy(alignbuffer, key, keylen); | |
814 | ret = cipher->setkey(tfm, alignbuffer, keylen); | |
815 | kzfree(buffer); | |
816 | return ret; | |
817 | } | |
818 | ||
819 | static int skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key, | |
820 | unsigned int keylen) | |
821 | { | |
822 | struct skcipher_alg *cipher = crypto_skcipher_alg(tfm); | |
823 | unsigned long alignmask = crypto_skcipher_alignmask(tfm); | |
f8d33fac | 824 | int err; |
9933e113 HX |
825 | |
826 | if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) { | |
827 | crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); | |
828 | return -EINVAL; | |
829 | } | |
830 | ||
831 | if ((unsigned long)key & alignmask) | |
f8d33fac EB |
832 | err = skcipher_setkey_unaligned(tfm, key, keylen); |
833 | else | |
834 | err = cipher->setkey(tfm, key, keylen); | |
835 | ||
b1f6b4bf EB |
836 | if (unlikely(err)) { |
837 | skcipher_set_needkey(tfm); | |
f8d33fac | 838 | return err; |
b1f6b4bf | 839 | } |
9933e113 | 840 | |
f8d33fac EB |
841 | crypto_skcipher_clear_flags(tfm, CRYPTO_TFM_NEED_KEY); |
842 | return 0; | |
9933e113 HX |
843 | } |
844 | ||
4e6c3df4 HX |
845 | static void crypto_skcipher_exit_tfm(struct crypto_tfm *tfm) |
846 | { | |
847 | struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm); | |
848 | struct skcipher_alg *alg = crypto_skcipher_alg(skcipher); | |
849 | ||
850 | alg->exit(skcipher); | |
851 | } | |
852 | ||
7a7ffe65 HX |
853 | static int crypto_skcipher_init_tfm(struct crypto_tfm *tfm) |
854 | { | |
4e6c3df4 HX |
855 | struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm); |
856 | struct skcipher_alg *alg = crypto_skcipher_alg(skcipher); | |
857 | ||
7a7ffe65 HX |
858 | if (tfm->__crt_alg->cra_type == &crypto_blkcipher_type) |
859 | return crypto_init_skcipher_ops_blkcipher(tfm); | |
860 | ||
c79b411e | 861 | if (tfm->__crt_alg->cra_type == &crypto_ablkcipher_type) |
4e6c3df4 HX |
862 | return crypto_init_skcipher_ops_ablkcipher(tfm); |
863 | ||
9933e113 | 864 | skcipher->setkey = skcipher_setkey; |
4e6c3df4 HX |
865 | skcipher->encrypt = alg->encrypt; |
866 | skcipher->decrypt = alg->decrypt; | |
867 | skcipher->ivsize = alg->ivsize; | |
868 | skcipher->keysize = alg->max_keysize; | |
869 | ||
b1f6b4bf | 870 | skcipher_set_needkey(skcipher); |
f8d33fac | 871 | |
4e6c3df4 HX |
872 | if (alg->exit) |
873 | skcipher->base.exit = crypto_skcipher_exit_tfm; | |
7a7ffe65 | 874 | |
4e6c3df4 HX |
875 | if (alg->init) |
876 | return alg->init(skcipher); | |
877 | ||
878 | return 0; | |
879 | } | |
880 | ||
881 | static void crypto_skcipher_free_instance(struct crypto_instance *inst) | |
882 | { | |
883 | struct skcipher_instance *skcipher = | |
884 | container_of(inst, struct skcipher_instance, s.base); | |
885 | ||
886 | skcipher->free(skcipher); | |
887 | } | |
888 | ||
889 | static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg) | |
d8c34b94 | 890 | __maybe_unused; |
4e6c3df4 HX |
891 | static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg) |
892 | { | |
893 | struct skcipher_alg *skcipher = container_of(alg, struct skcipher_alg, | |
894 | base); | |
895 | ||
896 | seq_printf(m, "type : skcipher\n"); | |
897 | seq_printf(m, "async : %s\n", | |
898 | alg->cra_flags & CRYPTO_ALG_ASYNC ? "yes" : "no"); | |
899 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
900 | seq_printf(m, "min keysize : %u\n", skcipher->min_keysize); | |
901 | seq_printf(m, "max keysize : %u\n", skcipher->max_keysize); | |
902 | seq_printf(m, "ivsize : %u\n", skcipher->ivsize); | |
903 | seq_printf(m, "chunksize : %u\n", skcipher->chunksize); | |
c821f6ab | 904 | seq_printf(m, "walksize : %u\n", skcipher->walksize); |
7a7ffe65 HX |
905 | } |
906 | ||
4e6c3df4 HX |
907 | #ifdef CONFIG_NET |
908 | static int crypto_skcipher_report(struct sk_buff *skb, struct crypto_alg *alg) | |
909 | { | |
910 | struct crypto_report_blkcipher rblkcipher; | |
911 | struct skcipher_alg *skcipher = container_of(alg, struct skcipher_alg, | |
912 | base); | |
913 | ||
37db69e0 EB |
914 | memset(&rblkcipher, 0, sizeof(rblkcipher)); |
915 | ||
916 | strscpy(rblkcipher.type, "skcipher", sizeof(rblkcipher.type)); | |
917 | strscpy(rblkcipher.geniv, "<none>", sizeof(rblkcipher.geniv)); | |
4e6c3df4 HX |
918 | |
919 | rblkcipher.blocksize = alg->cra_blocksize; | |
920 | rblkcipher.min_keysize = skcipher->min_keysize; | |
921 | rblkcipher.max_keysize = skcipher->max_keysize; | |
922 | rblkcipher.ivsize = skcipher->ivsize; | |
923 | ||
37db69e0 EB |
924 | return nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER, |
925 | sizeof(rblkcipher), &rblkcipher); | |
4e6c3df4 HX |
926 | } |
927 | #else | |
928 | static int crypto_skcipher_report(struct sk_buff *skb, struct crypto_alg *alg) | |
929 | { | |
930 | return -ENOSYS; | |
931 | } | |
932 | #endif | |
933 | ||
7a7ffe65 HX |
934 | static const struct crypto_type crypto_skcipher_type2 = { |
935 | .extsize = crypto_skcipher_extsize, | |
936 | .init_tfm = crypto_skcipher_init_tfm, | |
4e6c3df4 HX |
937 | .free = crypto_skcipher_free_instance, |
938 | #ifdef CONFIG_PROC_FS | |
939 | .show = crypto_skcipher_show, | |
940 | #endif | |
941 | .report = crypto_skcipher_report, | |
7a7ffe65 HX |
942 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, |
943 | .maskset = CRYPTO_ALG_TYPE_BLKCIPHER_MASK, | |
4e6c3df4 | 944 | .type = CRYPTO_ALG_TYPE_SKCIPHER, |
7a7ffe65 HX |
945 | .tfmsize = offsetof(struct crypto_skcipher, base), |
946 | }; | |
947 | ||
3a01d0ee | 948 | int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, |
4e6c3df4 HX |
949 | const char *name, u32 type, u32 mask) |
950 | { | |
951 | spawn->base.frontend = &crypto_skcipher_type2; | |
952 | return crypto_grab_spawn(&spawn->base, name, type, mask); | |
953 | } | |
3a01d0ee | 954 | EXPORT_SYMBOL_GPL(crypto_grab_skcipher); |
4e6c3df4 | 955 | |
7a7ffe65 HX |
956 | struct crypto_skcipher *crypto_alloc_skcipher(const char *alg_name, |
957 | u32 type, u32 mask) | |
958 | { | |
959 | return crypto_alloc_tfm(alg_name, &crypto_skcipher_type2, type, mask); | |
960 | } | |
961 | EXPORT_SYMBOL_GPL(crypto_alloc_skcipher); | |
962 | ||
b350bee5 KC |
963 | struct crypto_sync_skcipher *crypto_alloc_sync_skcipher( |
964 | const char *alg_name, u32 type, u32 mask) | |
965 | { | |
966 | struct crypto_skcipher *tfm; | |
967 | ||
968 | /* Only sync algorithms allowed. */ | |
969 | mask |= CRYPTO_ALG_ASYNC; | |
970 | ||
971 | tfm = crypto_alloc_tfm(alg_name, &crypto_skcipher_type2, type, mask); | |
972 | ||
973 | /* | |
974 | * Make sure we do not allocate something that might get used with | |
975 | * an on-stack request: check the request size. | |
976 | */ | |
977 | if (!IS_ERR(tfm) && WARN_ON(crypto_skcipher_reqsize(tfm) > | |
978 | MAX_SYNC_SKCIPHER_REQSIZE)) { | |
979 | crypto_free_skcipher(tfm); | |
980 | return ERR_PTR(-EINVAL); | |
981 | } | |
982 | ||
983 | return (struct crypto_sync_skcipher *)tfm; | |
984 | } | |
985 | EXPORT_SYMBOL_GPL(crypto_alloc_sync_skcipher); | |
986 | ||
4e6c3df4 HX |
987 | int crypto_has_skcipher2(const char *alg_name, u32 type, u32 mask) |
988 | { | |
989 | return crypto_type_has_alg(alg_name, &crypto_skcipher_type2, | |
990 | type, mask); | |
991 | } | |
992 | EXPORT_SYMBOL_GPL(crypto_has_skcipher2); | |
993 | ||
994 | static int skcipher_prepare_alg(struct skcipher_alg *alg) | |
995 | { | |
996 | struct crypto_alg *base = &alg->base; | |
997 | ||
c821f6ab AB |
998 | if (alg->ivsize > PAGE_SIZE / 8 || alg->chunksize > PAGE_SIZE / 8 || |
999 | alg->walksize > PAGE_SIZE / 8) | |
4e6c3df4 HX |
1000 | return -EINVAL; |
1001 | ||
1002 | if (!alg->chunksize) | |
1003 | alg->chunksize = base->cra_blocksize; | |
c821f6ab AB |
1004 | if (!alg->walksize) |
1005 | alg->walksize = alg->chunksize; | |
4e6c3df4 HX |
1006 | |
1007 | base->cra_type = &crypto_skcipher_type2; | |
1008 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; | |
1009 | base->cra_flags |= CRYPTO_ALG_TYPE_SKCIPHER; | |
1010 | ||
1011 | return 0; | |
1012 | } | |
1013 | ||
1014 | int crypto_register_skcipher(struct skcipher_alg *alg) | |
1015 | { | |
1016 | struct crypto_alg *base = &alg->base; | |
1017 | int err; | |
1018 | ||
1019 | err = skcipher_prepare_alg(alg); | |
1020 | if (err) | |
1021 | return err; | |
1022 | ||
1023 | return crypto_register_alg(base); | |
1024 | } | |
1025 | EXPORT_SYMBOL_GPL(crypto_register_skcipher); | |
1026 | ||
1027 | void crypto_unregister_skcipher(struct skcipher_alg *alg) | |
1028 | { | |
1029 | crypto_unregister_alg(&alg->base); | |
1030 | } | |
1031 | EXPORT_SYMBOL_GPL(crypto_unregister_skcipher); | |
1032 | ||
1033 | int crypto_register_skciphers(struct skcipher_alg *algs, int count) | |
1034 | { | |
1035 | int i, ret; | |
1036 | ||
1037 | for (i = 0; i < count; i++) { | |
1038 | ret = crypto_register_skcipher(&algs[i]); | |
1039 | if (ret) | |
1040 | goto err; | |
1041 | } | |
1042 | ||
1043 | return 0; | |
1044 | ||
1045 | err: | |
1046 | for (--i; i >= 0; --i) | |
1047 | crypto_unregister_skcipher(&algs[i]); | |
1048 | ||
1049 | return ret; | |
1050 | } | |
1051 | EXPORT_SYMBOL_GPL(crypto_register_skciphers); | |
1052 | ||
1053 | void crypto_unregister_skciphers(struct skcipher_alg *algs, int count) | |
1054 | { | |
1055 | int i; | |
1056 | ||
1057 | for (i = count - 1; i >= 0; --i) | |
1058 | crypto_unregister_skcipher(&algs[i]); | |
1059 | } | |
1060 | EXPORT_SYMBOL_GPL(crypto_unregister_skciphers); | |
1061 | ||
1062 | int skcipher_register_instance(struct crypto_template *tmpl, | |
1063 | struct skcipher_instance *inst) | |
1064 | { | |
1065 | int err; | |
1066 | ||
1067 | err = skcipher_prepare_alg(&inst->alg); | |
1068 | if (err) | |
1069 | return err; | |
1070 | ||
1071 | return crypto_register_instance(tmpl, skcipher_crypto_instance(inst)); | |
1072 | } | |
1073 | EXPORT_SYMBOL_GPL(skcipher_register_instance); | |
1074 | ||
0872da16 EB |
1075 | static int skcipher_setkey_simple(struct crypto_skcipher *tfm, const u8 *key, |
1076 | unsigned int keylen) | |
1077 | { | |
1078 | struct crypto_cipher *cipher = skcipher_cipher_simple(tfm); | |
1079 | int err; | |
1080 | ||
1081 | crypto_cipher_clear_flags(cipher, CRYPTO_TFM_REQ_MASK); | |
1082 | crypto_cipher_set_flags(cipher, crypto_skcipher_get_flags(tfm) & | |
1083 | CRYPTO_TFM_REQ_MASK); | |
1084 | err = crypto_cipher_setkey(cipher, key, keylen); | |
1085 | crypto_skcipher_set_flags(tfm, crypto_cipher_get_flags(cipher) & | |
1086 | CRYPTO_TFM_RES_MASK); | |
1087 | return err; | |
1088 | } | |
1089 | ||
1090 | static int skcipher_init_tfm_simple(struct crypto_skcipher *tfm) | |
1091 | { | |
1092 | struct skcipher_instance *inst = skcipher_alg_instance(tfm); | |
1093 | struct crypto_spawn *spawn = skcipher_instance_ctx(inst); | |
1094 | struct skcipher_ctx_simple *ctx = crypto_skcipher_ctx(tfm); | |
1095 | struct crypto_cipher *cipher; | |
1096 | ||
1097 | cipher = crypto_spawn_cipher(spawn); | |
1098 | if (IS_ERR(cipher)) | |
1099 | return PTR_ERR(cipher); | |
1100 | ||
1101 | ctx->cipher = cipher; | |
1102 | return 0; | |
1103 | } | |
1104 | ||
1105 | static void skcipher_exit_tfm_simple(struct crypto_skcipher *tfm) | |
1106 | { | |
1107 | struct skcipher_ctx_simple *ctx = crypto_skcipher_ctx(tfm); | |
1108 | ||
1109 | crypto_free_cipher(ctx->cipher); | |
1110 | } | |
1111 | ||
1112 | static void skcipher_free_instance_simple(struct skcipher_instance *inst) | |
1113 | { | |
1114 | crypto_drop_spawn(skcipher_instance_ctx(inst)); | |
1115 | kfree(inst); | |
1116 | } | |
1117 | ||
1118 | /** | |
1119 | * skcipher_alloc_instance_simple - allocate instance of simple block cipher mode | |
1120 | * | |
1121 | * Allocate an skcipher_instance for a simple block cipher mode of operation, | |
1122 | * e.g. cbc or ecb. The instance context will have just a single crypto_spawn, | |
1123 | * that for the underlying cipher. The {min,max}_keysize, ivsize, blocksize, | |
1124 | * alignmask, and priority are set from the underlying cipher but can be | |
1125 | * overridden if needed. The tfm context defaults to skcipher_ctx_simple, and | |
1126 | * default ->setkey(), ->init(), and ->exit() methods are installed. | |
1127 | * | |
1128 | * @tmpl: the template being instantiated | |
1129 | * @tb: the template parameters | |
1130 | * @cipher_alg_ret: on success, a pointer to the underlying cipher algorithm is | |
1131 | * returned here. It must be dropped with crypto_mod_put(). | |
1132 | * | |
1133 | * Return: a pointer to the new instance, or an ERR_PTR(). The caller still | |
1134 | * needs to register the instance. | |
1135 | */ | |
1136 | struct skcipher_instance * | |
1137 | skcipher_alloc_instance_simple(struct crypto_template *tmpl, struct rtattr **tb, | |
1138 | struct crypto_alg **cipher_alg_ret) | |
1139 | { | |
1140 | struct crypto_attr_type *algt; | |
1141 | struct crypto_alg *cipher_alg; | |
1142 | struct skcipher_instance *inst; | |
1143 | struct crypto_spawn *spawn; | |
1144 | u32 mask; | |
1145 | int err; | |
1146 | ||
1147 | algt = crypto_get_attr_type(tb); | |
1148 | if (IS_ERR(algt)) | |
1149 | return ERR_CAST(algt); | |
1150 | ||
1151 | if ((algt->type ^ CRYPTO_ALG_TYPE_SKCIPHER) & algt->mask) | |
1152 | return ERR_PTR(-EINVAL); | |
1153 | ||
1154 | mask = CRYPTO_ALG_TYPE_MASK | | |
1155 | crypto_requires_off(algt->type, algt->mask, | |
1156 | CRYPTO_ALG_NEED_FALLBACK); | |
1157 | ||
1158 | cipher_alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER, mask); | |
1159 | if (IS_ERR(cipher_alg)) | |
1160 | return ERR_CAST(cipher_alg); | |
1161 | ||
1162 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); | |
1163 | if (!inst) { | |
1164 | err = -ENOMEM; | |
1165 | goto err_put_cipher_alg; | |
1166 | } | |
1167 | spawn = skcipher_instance_ctx(inst); | |
1168 | ||
1169 | err = crypto_inst_setname(skcipher_crypto_instance(inst), tmpl->name, | |
1170 | cipher_alg); | |
1171 | if (err) | |
1172 | goto err_free_inst; | |
1173 | ||
1174 | err = crypto_init_spawn(spawn, cipher_alg, | |
1175 | skcipher_crypto_instance(inst), | |
1176 | CRYPTO_ALG_TYPE_MASK); | |
1177 | if (err) | |
1178 | goto err_free_inst; | |
1179 | inst->free = skcipher_free_instance_simple; | |
1180 | ||
1181 | /* Default algorithm properties, can be overridden */ | |
1182 | inst->alg.base.cra_blocksize = cipher_alg->cra_blocksize; | |
1183 | inst->alg.base.cra_alignmask = cipher_alg->cra_alignmask; | |
1184 | inst->alg.base.cra_priority = cipher_alg->cra_priority; | |
1185 | inst->alg.min_keysize = cipher_alg->cra_cipher.cia_min_keysize; | |
1186 | inst->alg.max_keysize = cipher_alg->cra_cipher.cia_max_keysize; | |
1187 | inst->alg.ivsize = cipher_alg->cra_blocksize; | |
1188 | ||
1189 | /* Use skcipher_ctx_simple by default, can be overridden */ | |
1190 | inst->alg.base.cra_ctxsize = sizeof(struct skcipher_ctx_simple); | |
1191 | inst->alg.setkey = skcipher_setkey_simple; | |
1192 | inst->alg.init = skcipher_init_tfm_simple; | |
1193 | inst->alg.exit = skcipher_exit_tfm_simple; | |
1194 | ||
1195 | *cipher_alg_ret = cipher_alg; | |
1196 | return inst; | |
1197 | ||
1198 | err_free_inst: | |
1199 | kfree(inst); | |
1200 | err_put_cipher_alg: | |
1201 | crypto_mod_put(cipher_alg); | |
1202 | return ERR_PTR(err); | |
1203 | } | |
1204 | EXPORT_SYMBOL_GPL(skcipher_alloc_instance_simple); | |
1205 | ||
7a7ffe65 HX |
1206 | MODULE_LICENSE("GPL"); |
1207 | MODULE_DESCRIPTION("Symmetric key cipher type"); |