Commit | Line | Data |
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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> |
0eb76ba2 | 13 | #include <crypto/internal/cipher.h> |
7a7ffe65 | 14 | #include <crypto/internal/skcipher.h> |
b286d8b1 | 15 | #include <crypto/scatterwalk.h> |
7a7ffe65 | 16 | #include <linux/bug.h> |
4e6c3df4 | 17 | #include <linux/cryptouser.h> |
1085680b HX |
18 | #include <linux/err.h> |
19 | #include <linux/kernel.h> | |
b286d8b1 | 20 | #include <linux/list.h> |
1085680b | 21 | #include <linux/mm.h> |
7a7ffe65 | 22 | #include <linux/module.h> |
4e6c3df4 | 23 | #include <linux/seq_file.h> |
1085680b HX |
24 | #include <linux/slab.h> |
25 | #include <linux/string.h> | |
4e6c3df4 | 26 | #include <net/netlink.h> |
31865c4c | 27 | #include "skcipher.h" |
7a7ffe65 | 28 | |
31865c4c | 29 | #define CRYPTO_ALG_TYPE_SKCIPHER_MASK 0x0000000e |
7a7ffe65 | 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 | ||
31865c4c HX |
47 | static const struct crypto_type crypto_skcipher_type; |
48 | ||
b286d8b1 HX |
49 | static int skcipher_walk_next(struct skcipher_walk *walk); |
50 | ||
b286d8b1 HX |
51 | static inline void skcipher_map_src(struct skcipher_walk *walk) |
52 | { | |
d07bd950 | 53 | walk->src.virt.addr = scatterwalk_map(&walk->in); |
b286d8b1 HX |
54 | } |
55 | ||
56 | static inline void skcipher_map_dst(struct skcipher_walk *walk) | |
57 | { | |
d07bd950 | 58 | walk->dst.virt.addr = scatterwalk_map(&walk->out); |
b286d8b1 HX |
59 | } |
60 | ||
61 | static inline void skcipher_unmap_src(struct skcipher_walk *walk) | |
62 | { | |
d07bd950 | 63 | scatterwalk_unmap(walk->src.virt.addr); |
b286d8b1 HX |
64 | } |
65 | ||
66 | static inline void skcipher_unmap_dst(struct skcipher_walk *walk) | |
67 | { | |
d07bd950 | 68 | scatterwalk_unmap(walk->dst.virt.addr); |
b286d8b1 HX |
69 | } |
70 | ||
71 | static inline gfp_t skcipher_walk_gfp(struct skcipher_walk *walk) | |
72 | { | |
73 | return walk->flags & SKCIPHER_WALK_SLEEP ? GFP_KERNEL : GFP_ATOMIC; | |
74 | } | |
75 | ||
76 | /* Get a spot of the specified length that does not straddle a page. | |
77 | * The caller needs to ensure that there is enough space for this operation. | |
78 | */ | |
79 | static inline u8 *skcipher_get_spot(u8 *start, unsigned int len) | |
80 | { | |
81 | u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK); | |
82 | ||
83 | return max(start, end_page); | |
84 | } | |
85 | ||
1085680b HX |
86 | static inline struct skcipher_alg *__crypto_skcipher_alg( |
87 | struct crypto_alg *alg) | |
88 | { | |
89 | return container_of(alg, struct skcipher_alg, base); | |
90 | } | |
91 | ||
0ba3c026 | 92 | static int skcipher_done_slow(struct skcipher_walk *walk, unsigned int bsize) |
b286d8b1 HX |
93 | { |
94 | u8 *addr; | |
95 | ||
96 | addr = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1); | |
97 | addr = skcipher_get_spot(addr, bsize); | |
98 | scatterwalk_copychunks(addr, &walk->out, bsize, | |
99 | (walk->flags & SKCIPHER_WALK_PHYS) ? 2 : 1); | |
0ba3c026 | 100 | return 0; |
b286d8b1 HX |
101 | } |
102 | ||
103 | int skcipher_walk_done(struct skcipher_walk *walk, int err) | |
104 | { | |
0ba3c026 HX |
105 | unsigned int n = walk->nbytes; |
106 | unsigned int nbytes = 0; | |
8088d3dd | 107 | |
0ba3c026 | 108 | if (!n) |
8088d3dd EB |
109 | goto finish; |
110 | ||
0ba3c026 HX |
111 | if (likely(err >= 0)) { |
112 | n -= err; | |
113 | nbytes = walk->total - n; | |
114 | } | |
8088d3dd EB |
115 | |
116 | if (likely(!(walk->flags & (SKCIPHER_WALK_PHYS | | |
117 | SKCIPHER_WALK_SLOW | | |
118 | SKCIPHER_WALK_COPY | | |
119 | SKCIPHER_WALK_DIFF)))) { | |
b286d8b1 HX |
120 | unmap_src: |
121 | skcipher_unmap_src(walk); | |
122 | } else if (walk->flags & SKCIPHER_WALK_DIFF) { | |
123 | skcipher_unmap_dst(walk); | |
124 | goto unmap_src; | |
125 | } else if (walk->flags & SKCIPHER_WALK_COPY) { | |
126 | skcipher_map_dst(walk); | |
127 | memcpy(walk->dst.virt.addr, walk->page, n); | |
128 | skcipher_unmap_dst(walk); | |
129 | } else if (unlikely(walk->flags & SKCIPHER_WALK_SLOW)) { | |
0ba3c026 | 130 | if (err > 0) { |
dcaca01a EB |
131 | /* |
132 | * Didn't process all bytes. Either the algorithm is | |
133 | * broken, or this was the last step and it turned out | |
134 | * the message wasn't evenly divisible into blocks but | |
135 | * the algorithm requires it. | |
136 | */ | |
b286d8b1 | 137 | err = -EINVAL; |
0ba3c026 HX |
138 | nbytes = 0; |
139 | } else | |
140 | n = skcipher_done_slow(walk, n); | |
b286d8b1 HX |
141 | } |
142 | ||
0ba3c026 HX |
143 | if (err > 0) |
144 | err = 0; | |
145 | ||
146 | walk->total = nbytes; | |
147 | walk->nbytes = 0; | |
148 | ||
b286d8b1 HX |
149 | scatterwalk_advance(&walk->in, n); |
150 | scatterwalk_advance(&walk->out, n); | |
0ba3c026 HX |
151 | scatterwalk_done(&walk->in, 0, nbytes); |
152 | scatterwalk_done(&walk->out, 1, nbytes); | |
b286d8b1 | 153 | |
0ba3c026 | 154 | if (nbytes) { |
b286d8b1 HX |
155 | crypto_yield(walk->flags & SKCIPHER_WALK_SLEEP ? |
156 | CRYPTO_TFM_REQ_MAY_SLEEP : 0); | |
157 | return skcipher_walk_next(walk); | |
158 | } | |
159 | ||
0ba3c026 | 160 | finish: |
b286d8b1 HX |
161 | /* Short-circuit for the common/fast path. */ |
162 | if (!((unsigned long)walk->buffer | (unsigned long)walk->page)) | |
163 | goto out; | |
164 | ||
165 | if (walk->flags & SKCIPHER_WALK_PHYS) | |
166 | goto out; | |
167 | ||
168 | if (walk->iv != walk->oiv) | |
169 | memcpy(walk->oiv, walk->iv, walk->ivsize); | |
170 | if (walk->buffer != walk->page) | |
171 | kfree(walk->buffer); | |
172 | if (walk->page) | |
173 | free_page((unsigned long)walk->page); | |
174 | ||
175 | out: | |
176 | return err; | |
177 | } | |
178 | EXPORT_SYMBOL_GPL(skcipher_walk_done); | |
179 | ||
180 | void skcipher_walk_complete(struct skcipher_walk *walk, int err) | |
181 | { | |
182 | struct skcipher_walk_buffer *p, *tmp; | |
183 | ||
184 | list_for_each_entry_safe(p, tmp, &walk->buffers, entry) { | |
185 | u8 *data; | |
186 | ||
187 | if (err) | |
188 | goto done; | |
189 | ||
190 | data = p->data; | |
191 | if (!data) { | |
192 | data = PTR_ALIGN(&p->buffer[0], walk->alignmask + 1); | |
c821f6ab | 193 | data = skcipher_get_spot(data, walk->stride); |
b286d8b1 HX |
194 | } |
195 | ||
196 | scatterwalk_copychunks(data, &p->dst, p->len, 1); | |
197 | ||
c821f6ab | 198 | if (offset_in_page(p->data) + p->len + walk->stride > |
b286d8b1 HX |
199 | PAGE_SIZE) |
200 | free_page((unsigned long)p->data); | |
201 | ||
202 | done: | |
203 | list_del(&p->entry); | |
204 | kfree(p); | |
205 | } | |
206 | ||
207 | if (!err && walk->iv != walk->oiv) | |
208 | memcpy(walk->oiv, walk->iv, walk->ivsize); | |
209 | if (walk->buffer != walk->page) | |
210 | kfree(walk->buffer); | |
211 | if (walk->page) | |
212 | free_page((unsigned long)walk->page); | |
213 | } | |
214 | EXPORT_SYMBOL_GPL(skcipher_walk_complete); | |
215 | ||
216 | static void skcipher_queue_write(struct skcipher_walk *walk, | |
217 | struct skcipher_walk_buffer *p) | |
218 | { | |
219 | p->dst = walk->out; | |
220 | list_add_tail(&p->entry, &walk->buffers); | |
221 | } | |
222 | ||
223 | static int skcipher_next_slow(struct skcipher_walk *walk, unsigned int bsize) | |
224 | { | |
225 | bool phys = walk->flags & SKCIPHER_WALK_PHYS; | |
226 | unsigned alignmask = walk->alignmask; | |
227 | struct skcipher_walk_buffer *p; | |
228 | unsigned a; | |
229 | unsigned n; | |
230 | u8 *buffer; | |
231 | void *v; | |
232 | ||
233 | if (!phys) { | |
18e615ad AB |
234 | if (!walk->buffer) |
235 | walk->buffer = walk->page; | |
236 | buffer = walk->buffer; | |
b286d8b1 HX |
237 | if (buffer) |
238 | goto ok; | |
239 | } | |
240 | ||
241 | /* Start with the minimum alignment of kmalloc. */ | |
242 | a = crypto_tfm_ctx_alignment() - 1; | |
243 | n = bsize; | |
244 | ||
245 | if (phys) { | |
246 | /* Calculate the minimum alignment of p->buffer. */ | |
247 | a &= (sizeof(*p) ^ (sizeof(*p) - 1)) >> 1; | |
248 | n += sizeof(*p); | |
249 | } | |
250 | ||
251 | /* Minimum size to align p->buffer by alignmask. */ | |
252 | n += alignmask & ~a; | |
253 | ||
254 | /* Minimum size to ensure p->buffer does not straddle a page. */ | |
255 | n += (bsize - 1) & ~(alignmask | a); | |
256 | ||
257 | v = kzalloc(n, skcipher_walk_gfp(walk)); | |
258 | if (!v) | |
259 | return skcipher_walk_done(walk, -ENOMEM); | |
260 | ||
261 | if (phys) { | |
262 | p = v; | |
263 | p->len = bsize; | |
264 | skcipher_queue_write(walk, p); | |
265 | buffer = p->buffer; | |
266 | } else { | |
267 | walk->buffer = v; | |
268 | buffer = v; | |
269 | } | |
270 | ||
271 | ok: | |
272 | walk->dst.virt.addr = PTR_ALIGN(buffer, alignmask + 1); | |
273 | walk->dst.virt.addr = skcipher_get_spot(walk->dst.virt.addr, bsize); | |
274 | walk->src.virt.addr = walk->dst.virt.addr; | |
275 | ||
276 | scatterwalk_copychunks(walk->src.virt.addr, &walk->in, bsize, 0); | |
277 | ||
278 | walk->nbytes = bsize; | |
279 | walk->flags |= SKCIPHER_WALK_SLOW; | |
280 | ||
281 | return 0; | |
282 | } | |
283 | ||
284 | static int skcipher_next_copy(struct skcipher_walk *walk) | |
285 | { | |
286 | struct skcipher_walk_buffer *p; | |
287 | u8 *tmp = walk->page; | |
288 | ||
289 | skcipher_map_src(walk); | |
290 | memcpy(tmp, walk->src.virt.addr, walk->nbytes); | |
291 | skcipher_unmap_src(walk); | |
292 | ||
293 | walk->src.virt.addr = tmp; | |
294 | walk->dst.virt.addr = tmp; | |
295 | ||
296 | if (!(walk->flags & SKCIPHER_WALK_PHYS)) | |
297 | return 0; | |
298 | ||
299 | p = kmalloc(sizeof(*p), skcipher_walk_gfp(walk)); | |
300 | if (!p) | |
301 | return -ENOMEM; | |
302 | ||
303 | p->data = walk->page; | |
304 | p->len = walk->nbytes; | |
305 | skcipher_queue_write(walk, p); | |
306 | ||
c821f6ab | 307 | if (offset_in_page(walk->page) + walk->nbytes + walk->stride > |
b286d8b1 HX |
308 | PAGE_SIZE) |
309 | walk->page = NULL; | |
310 | else | |
311 | walk->page += walk->nbytes; | |
312 | ||
313 | return 0; | |
314 | } | |
315 | ||
316 | static int skcipher_next_fast(struct skcipher_walk *walk) | |
317 | { | |
318 | unsigned long diff; | |
319 | ||
320 | walk->src.phys.page = scatterwalk_page(&walk->in); | |
321 | walk->src.phys.offset = offset_in_page(walk->in.offset); | |
322 | walk->dst.phys.page = scatterwalk_page(&walk->out); | |
323 | walk->dst.phys.offset = offset_in_page(walk->out.offset); | |
324 | ||
325 | if (walk->flags & SKCIPHER_WALK_PHYS) | |
326 | return 0; | |
327 | ||
328 | diff = walk->src.phys.offset - walk->dst.phys.offset; | |
329 | diff |= walk->src.virt.page - walk->dst.virt.page; | |
330 | ||
331 | skcipher_map_src(walk); | |
332 | walk->dst.virt.addr = walk->src.virt.addr; | |
333 | ||
334 | if (diff) { | |
335 | walk->flags |= SKCIPHER_WALK_DIFF; | |
336 | skcipher_map_dst(walk); | |
337 | } | |
338 | ||
339 | return 0; | |
340 | } | |
341 | ||
342 | static int skcipher_walk_next(struct skcipher_walk *walk) | |
343 | { | |
344 | unsigned int bsize; | |
345 | unsigned int n; | |
346 | int err; | |
347 | ||
348 | walk->flags &= ~(SKCIPHER_WALK_SLOW | SKCIPHER_WALK_COPY | | |
349 | SKCIPHER_WALK_DIFF); | |
350 | ||
351 | n = walk->total; | |
c821f6ab | 352 | bsize = min(walk->stride, max(n, walk->blocksize)); |
b286d8b1 HX |
353 | n = scatterwalk_clamp(&walk->in, n); |
354 | n = scatterwalk_clamp(&walk->out, n); | |
355 | ||
356 | if (unlikely(n < bsize)) { | |
357 | if (unlikely(walk->total < walk->blocksize)) | |
358 | return skcipher_walk_done(walk, -EINVAL); | |
359 | ||
360 | slow_path: | |
361 | err = skcipher_next_slow(walk, bsize); | |
362 | goto set_phys_lowmem; | |
363 | } | |
364 | ||
365 | if (unlikely((walk->in.offset | walk->out.offset) & walk->alignmask)) { | |
366 | if (!walk->page) { | |
367 | gfp_t gfp = skcipher_walk_gfp(walk); | |
368 | ||
369 | walk->page = (void *)__get_free_page(gfp); | |
370 | if (!walk->page) | |
371 | goto slow_path; | |
372 | } | |
373 | ||
374 | walk->nbytes = min_t(unsigned, n, | |
375 | PAGE_SIZE - offset_in_page(walk->page)); | |
376 | walk->flags |= SKCIPHER_WALK_COPY; | |
377 | err = skcipher_next_copy(walk); | |
378 | goto set_phys_lowmem; | |
379 | } | |
380 | ||
381 | walk->nbytes = n; | |
382 | ||
383 | return skcipher_next_fast(walk); | |
384 | ||
385 | set_phys_lowmem: | |
386 | if (!err && (walk->flags & SKCIPHER_WALK_PHYS)) { | |
387 | walk->src.phys.page = virt_to_page(walk->src.virt.addr); | |
388 | walk->dst.phys.page = virt_to_page(walk->dst.virt.addr); | |
389 | walk->src.phys.offset &= PAGE_SIZE - 1; | |
390 | walk->dst.phys.offset &= PAGE_SIZE - 1; | |
391 | } | |
392 | return err; | |
393 | } | |
b286d8b1 HX |
394 | |
395 | static int skcipher_copy_iv(struct skcipher_walk *walk) | |
396 | { | |
397 | unsigned a = crypto_tfm_ctx_alignment() - 1; | |
398 | unsigned alignmask = walk->alignmask; | |
399 | unsigned ivsize = walk->ivsize; | |
c821f6ab | 400 | unsigned bs = walk->stride; |
b286d8b1 HX |
401 | unsigned aligned_bs; |
402 | unsigned size; | |
403 | u8 *iv; | |
404 | ||
0567fc9e | 405 | aligned_bs = ALIGN(bs, alignmask + 1); |
b286d8b1 HX |
406 | |
407 | /* Minimum size to align buffer by alignmask. */ | |
408 | size = alignmask & ~a; | |
409 | ||
410 | if (walk->flags & SKCIPHER_WALK_PHYS) | |
411 | size += ivsize; | |
412 | else { | |
413 | size += aligned_bs + ivsize; | |
414 | ||
415 | /* Minimum size to ensure buffer does not straddle a page. */ | |
416 | size += (bs - 1) & ~(alignmask | a); | |
417 | } | |
418 | ||
419 | walk->buffer = kmalloc(size, skcipher_walk_gfp(walk)); | |
420 | if (!walk->buffer) | |
421 | return -ENOMEM; | |
422 | ||
423 | iv = PTR_ALIGN(walk->buffer, alignmask + 1); | |
424 | iv = skcipher_get_spot(iv, bs) + aligned_bs; | |
425 | ||
426 | walk->iv = memcpy(iv, walk->iv, walk->ivsize); | |
427 | return 0; | |
428 | } | |
429 | ||
430 | static int skcipher_walk_first(struct skcipher_walk *walk) | |
431 | { | |
abfc7fad | 432 | if (WARN_ON_ONCE(in_hardirq())) |
b286d8b1 HX |
433 | return -EDEADLK; |
434 | ||
b286d8b1 HX |
435 | walk->buffer = NULL; |
436 | if (unlikely(((unsigned long)walk->iv & walk->alignmask))) { | |
437 | int err = skcipher_copy_iv(walk); | |
438 | if (err) | |
439 | return err; | |
440 | } | |
441 | ||
442 | walk->page = NULL; | |
b286d8b1 HX |
443 | |
444 | return skcipher_walk_next(walk); | |
445 | } | |
446 | ||
447 | static int skcipher_walk_skcipher(struct skcipher_walk *walk, | |
448 | struct skcipher_request *req) | |
449 | { | |
450 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
31865c4c | 451 | struct skcipher_alg *alg = crypto_skcipher_alg(tfm); |
b286d8b1 | 452 | |
0cabf2af HX |
453 | walk->total = req->cryptlen; |
454 | walk->nbytes = 0; | |
2b4f27c3 EB |
455 | walk->iv = req->iv; |
456 | walk->oiv = req->iv; | |
0cabf2af HX |
457 | |
458 | if (unlikely(!walk->total)) | |
459 | return 0; | |
460 | ||
b286d8b1 HX |
461 | scatterwalk_start(&walk->in, req->src); |
462 | scatterwalk_start(&walk->out, req->dst); | |
463 | ||
b286d8b1 HX |
464 | walk->flags &= ~SKCIPHER_WALK_SLEEP; |
465 | walk->flags |= req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? | |
466 | SKCIPHER_WALK_SLEEP : 0; | |
467 | ||
468 | walk->blocksize = crypto_skcipher_blocksize(tfm); | |
b286d8b1 HX |
469 | walk->ivsize = crypto_skcipher_ivsize(tfm); |
470 | walk->alignmask = crypto_skcipher_alignmask(tfm); | |
471 | ||
31865c4c HX |
472 | if (alg->co.base.cra_type != &crypto_skcipher_type) |
473 | walk->stride = alg->co.chunksize; | |
474 | else | |
475 | walk->stride = alg->walksize; | |
476 | ||
b286d8b1 HX |
477 | return skcipher_walk_first(walk); |
478 | } | |
479 | ||
480 | int skcipher_walk_virt(struct skcipher_walk *walk, | |
481 | struct skcipher_request *req, bool atomic) | |
482 | { | |
483 | int err; | |
484 | ||
bb648291 EB |
485 | might_sleep_if(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP); |
486 | ||
b286d8b1 HX |
487 | walk->flags &= ~SKCIPHER_WALK_PHYS; |
488 | ||
489 | err = skcipher_walk_skcipher(walk, req); | |
490 | ||
491 | walk->flags &= atomic ? ~SKCIPHER_WALK_SLEEP : ~0; | |
492 | ||
493 | return err; | |
494 | } | |
495 | EXPORT_SYMBOL_GPL(skcipher_walk_virt); | |
496 | ||
b286d8b1 HX |
497 | int skcipher_walk_async(struct skcipher_walk *walk, |
498 | struct skcipher_request *req) | |
499 | { | |
500 | walk->flags |= SKCIPHER_WALK_PHYS; | |
501 | ||
502 | INIT_LIST_HEAD(&walk->buffers); | |
503 | ||
504 | return skcipher_walk_skcipher(walk, req); | |
505 | } | |
506 | EXPORT_SYMBOL_GPL(skcipher_walk_async); | |
507 | ||
34bc085c HX |
508 | static int skcipher_walk_aead_common(struct skcipher_walk *walk, |
509 | struct aead_request *req, bool atomic) | |
b286d8b1 HX |
510 | { |
511 | struct crypto_aead *tfm = crypto_aead_reqtfm(req); | |
512 | int err; | |
513 | ||
0cabf2af | 514 | walk->nbytes = 0; |
2b4f27c3 EB |
515 | walk->iv = req->iv; |
516 | walk->oiv = req->iv; | |
0cabf2af HX |
517 | |
518 | if (unlikely(!walk->total)) | |
519 | return 0; | |
520 | ||
3cbf61fb AB |
521 | walk->flags &= ~SKCIPHER_WALK_PHYS; |
522 | ||
b286d8b1 HX |
523 | scatterwalk_start(&walk->in, req->src); |
524 | scatterwalk_start(&walk->out, req->dst); | |
525 | ||
526 | scatterwalk_copychunks(NULL, &walk->in, req->assoclen, 2); | |
527 | scatterwalk_copychunks(NULL, &walk->out, req->assoclen, 2); | |
528 | ||
c14ca838 OM |
529 | scatterwalk_done(&walk->in, 0, walk->total); |
530 | scatterwalk_done(&walk->out, 0, walk->total); | |
531 | ||
b286d8b1 HX |
532 | if (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) |
533 | walk->flags |= SKCIPHER_WALK_SLEEP; | |
534 | else | |
535 | walk->flags &= ~SKCIPHER_WALK_SLEEP; | |
536 | ||
537 | walk->blocksize = crypto_aead_blocksize(tfm); | |
c821f6ab | 538 | walk->stride = crypto_aead_chunksize(tfm); |
b286d8b1 HX |
539 | walk->ivsize = crypto_aead_ivsize(tfm); |
540 | walk->alignmask = crypto_aead_alignmask(tfm); | |
541 | ||
542 | err = skcipher_walk_first(walk); | |
543 | ||
544 | if (atomic) | |
545 | walk->flags &= ~SKCIPHER_WALK_SLEEP; | |
546 | ||
547 | return err; | |
548 | } | |
34bc085c | 549 | |
34bc085c HX |
550 | int skcipher_walk_aead_encrypt(struct skcipher_walk *walk, |
551 | struct aead_request *req, bool atomic) | |
552 | { | |
553 | walk->total = req->cryptlen; | |
554 | ||
555 | return skcipher_walk_aead_common(walk, req, atomic); | |
556 | } | |
557 | EXPORT_SYMBOL_GPL(skcipher_walk_aead_encrypt); | |
558 | ||
559 | int skcipher_walk_aead_decrypt(struct skcipher_walk *walk, | |
560 | struct aead_request *req, bool atomic) | |
561 | { | |
562 | struct crypto_aead *tfm = crypto_aead_reqtfm(req); | |
563 | ||
564 | walk->total = req->cryptlen - crypto_aead_authsize(tfm); | |
565 | ||
566 | return skcipher_walk_aead_common(walk, req, atomic); | |
567 | } | |
568 | EXPORT_SYMBOL_GPL(skcipher_walk_aead_decrypt); | |
569 | ||
b1f6b4bf EB |
570 | static void skcipher_set_needkey(struct crypto_skcipher *tfm) |
571 | { | |
9ac0d136 | 572 | if (crypto_skcipher_max_keysize(tfm) != 0) |
b1f6b4bf EB |
573 | crypto_skcipher_set_flags(tfm, CRYPTO_TFM_NEED_KEY); |
574 | } | |
575 | ||
9933e113 HX |
576 | static int skcipher_setkey_unaligned(struct crypto_skcipher *tfm, |
577 | const u8 *key, unsigned int keylen) | |
578 | { | |
579 | unsigned long alignmask = crypto_skcipher_alignmask(tfm); | |
580 | struct skcipher_alg *cipher = crypto_skcipher_alg(tfm); | |
581 | u8 *buffer, *alignbuffer; | |
582 | unsigned long absize; | |
583 | int ret; | |
584 | ||
585 | absize = keylen + alignmask; | |
586 | buffer = kmalloc(absize, GFP_ATOMIC); | |
587 | if (!buffer) | |
588 | return -ENOMEM; | |
589 | ||
590 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
591 | memcpy(alignbuffer, key, keylen); | |
592 | ret = cipher->setkey(tfm, alignbuffer, keylen); | |
453431a5 | 593 | kfree_sensitive(buffer); |
9933e113 HX |
594 | return ret; |
595 | } | |
596 | ||
15252d94 | 597 | int crypto_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key, |
9933e113 HX |
598 | unsigned int keylen) |
599 | { | |
600 | struct skcipher_alg *cipher = crypto_skcipher_alg(tfm); | |
601 | unsigned long alignmask = crypto_skcipher_alignmask(tfm); | |
f8d33fac | 602 | int err; |
9933e113 | 603 | |
31865c4c | 604 | if (cipher->co.base.cra_type != &crypto_skcipher_type) { |
7ec0a09d EB |
605 | struct crypto_lskcipher **ctx = crypto_skcipher_ctx(tfm); |
606 | ||
607 | crypto_lskcipher_clear_flags(*ctx, CRYPTO_TFM_REQ_MASK); | |
608 | crypto_lskcipher_set_flags(*ctx, | |
609 | crypto_skcipher_get_flags(tfm) & | |
610 | CRYPTO_TFM_REQ_MASK); | |
611 | err = crypto_lskcipher_setkey(*ctx, key, keylen); | |
31865c4c HX |
612 | goto out; |
613 | } | |
614 | ||
674f368a | 615 | if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) |
9933e113 | 616 | return -EINVAL; |
9933e113 HX |
617 | |
618 | if ((unsigned long)key & alignmask) | |
f8d33fac EB |
619 | err = skcipher_setkey_unaligned(tfm, key, keylen); |
620 | else | |
621 | err = cipher->setkey(tfm, key, keylen); | |
622 | ||
31865c4c | 623 | out: |
b1f6b4bf EB |
624 | if (unlikely(err)) { |
625 | skcipher_set_needkey(tfm); | |
f8d33fac | 626 | return err; |
b1f6b4bf | 627 | } |
9933e113 | 628 | |
f8d33fac EB |
629 | crypto_skcipher_clear_flags(tfm, CRYPTO_TFM_NEED_KEY); |
630 | return 0; | |
9933e113 | 631 | } |
15252d94 | 632 | EXPORT_SYMBOL_GPL(crypto_skcipher_setkey); |
9933e113 | 633 | |
81bcbb1e EB |
634 | int crypto_skcipher_encrypt(struct skcipher_request *req) |
635 | { | |
636 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
1085680b | 637 | struct skcipher_alg *alg = crypto_skcipher_alg(tfm); |
1085680b | 638 | |
81bcbb1e | 639 | if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) |
29ce50e0 EB |
640 | return -ENOKEY; |
641 | if (alg->co.base.cra_type != &crypto_skcipher_type) | |
642 | return crypto_lskcipher_encrypt_sg(req); | |
643 | return alg->encrypt(req); | |
81bcbb1e EB |
644 | } |
645 | EXPORT_SYMBOL_GPL(crypto_skcipher_encrypt); | |
646 | ||
647 | int crypto_skcipher_decrypt(struct skcipher_request *req) | |
648 | { | |
649 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
1085680b | 650 | struct skcipher_alg *alg = crypto_skcipher_alg(tfm); |
1085680b | 651 | |
81bcbb1e | 652 | if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) |
29ce50e0 EB |
653 | return -ENOKEY; |
654 | if (alg->co.base.cra_type != &crypto_skcipher_type) | |
655 | return crypto_lskcipher_decrypt_sg(req); | |
656 | return alg->decrypt(req); | |
81bcbb1e EB |
657 | } |
658 | EXPORT_SYMBOL_GPL(crypto_skcipher_decrypt); | |
659 | ||
662ea18d HX |
660 | static int crypto_lskcipher_export(struct skcipher_request *req, void *out) |
661 | { | |
662 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
663 | u8 *ivs = skcipher_request_ctx(req); | |
664 | ||
665 | ivs = PTR_ALIGN(ivs, crypto_skcipher_alignmask(tfm) + 1); | |
666 | ||
667 | memcpy(out, ivs + crypto_skcipher_ivsize(tfm), | |
668 | crypto_skcipher_statesize(tfm)); | |
669 | ||
670 | return 0; | |
671 | } | |
672 | ||
673 | static int crypto_lskcipher_import(struct skcipher_request *req, const void *in) | |
674 | { | |
675 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
676 | u8 *ivs = skcipher_request_ctx(req); | |
677 | ||
678 | ivs = PTR_ALIGN(ivs, crypto_skcipher_alignmask(tfm) + 1); | |
679 | ||
680 | memcpy(ivs + crypto_skcipher_ivsize(tfm), in, | |
681 | crypto_skcipher_statesize(tfm)); | |
682 | ||
683 | return 0; | |
684 | } | |
685 | ||
686 | static int skcipher_noexport(struct skcipher_request *req, void *out) | |
687 | { | |
688 | return 0; | |
689 | } | |
690 | ||
691 | static int skcipher_noimport(struct skcipher_request *req, const void *in) | |
692 | { | |
693 | return 0; | |
694 | } | |
695 | ||
696 | int crypto_skcipher_export(struct skcipher_request *req, void *out) | |
697 | { | |
698 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
699 | struct skcipher_alg *alg = crypto_skcipher_alg(tfm); | |
700 | ||
701 | if (alg->co.base.cra_type != &crypto_skcipher_type) | |
702 | return crypto_lskcipher_export(req, out); | |
703 | return alg->export(req, out); | |
704 | } | |
705 | EXPORT_SYMBOL_GPL(crypto_skcipher_export); | |
706 | ||
707 | int crypto_skcipher_import(struct skcipher_request *req, const void *in) | |
708 | { | |
709 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
710 | struct skcipher_alg *alg = crypto_skcipher_alg(tfm); | |
711 | ||
712 | if (alg->co.base.cra_type != &crypto_skcipher_type) | |
713 | return crypto_lskcipher_import(req, in); | |
714 | return alg->import(req, in); | |
715 | } | |
716 | EXPORT_SYMBOL_GPL(crypto_skcipher_import); | |
717 | ||
4e6c3df4 HX |
718 | static void crypto_skcipher_exit_tfm(struct crypto_tfm *tfm) |
719 | { | |
720 | struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm); | |
721 | struct skcipher_alg *alg = crypto_skcipher_alg(skcipher); | |
722 | ||
723 | alg->exit(skcipher); | |
724 | } | |
725 | ||
7a7ffe65 HX |
726 | static int crypto_skcipher_init_tfm(struct crypto_tfm *tfm) |
727 | { | |
4e6c3df4 HX |
728 | struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm); |
729 | struct skcipher_alg *alg = crypto_skcipher_alg(skcipher); | |
730 | ||
b1f6b4bf | 731 | skcipher_set_needkey(skcipher); |
f8d33fac | 732 | |
662ea18d HX |
733 | if (tfm->__crt_alg->cra_type != &crypto_skcipher_type) { |
734 | unsigned am = crypto_skcipher_alignmask(skcipher); | |
735 | unsigned reqsize; | |
736 | ||
737 | reqsize = am & ~(crypto_tfm_ctx_alignment() - 1); | |
738 | reqsize += crypto_skcipher_ivsize(skcipher); | |
739 | reqsize += crypto_skcipher_statesize(skcipher); | |
740 | crypto_skcipher_set_reqsize(skcipher, reqsize); | |
741 | ||
31865c4c | 742 | return crypto_init_lskcipher_ops_sg(tfm); |
662ea18d | 743 | } |
31865c4c | 744 | |
4e6c3df4 HX |
745 | if (alg->exit) |
746 | skcipher->base.exit = crypto_skcipher_exit_tfm; | |
7a7ffe65 | 747 | |
4e6c3df4 HX |
748 | if (alg->init) |
749 | return alg->init(skcipher); | |
750 | ||
751 | return 0; | |
752 | } | |
753 | ||
31865c4c HX |
754 | static unsigned int crypto_skcipher_extsize(struct crypto_alg *alg) |
755 | { | |
756 | if (alg->cra_type != &crypto_skcipher_type) | |
757 | return sizeof(struct crypto_lskcipher *); | |
758 | ||
759 | return crypto_alg_extsize(alg); | |
760 | } | |
761 | ||
4e6c3df4 HX |
762 | static void crypto_skcipher_free_instance(struct crypto_instance *inst) |
763 | { | |
764 | struct skcipher_instance *skcipher = | |
765 | container_of(inst, struct skcipher_instance, s.base); | |
766 | ||
767 | skcipher->free(skcipher); | |
768 | } | |
769 | ||
770 | static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg) | |
d8c34b94 | 771 | __maybe_unused; |
4e6c3df4 HX |
772 | static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg) |
773 | { | |
1085680b | 774 | struct skcipher_alg *skcipher = __crypto_skcipher_alg(alg); |
4e6c3df4 HX |
775 | |
776 | seq_printf(m, "type : skcipher\n"); | |
777 | seq_printf(m, "async : %s\n", | |
778 | alg->cra_flags & CRYPTO_ALG_ASYNC ? "yes" : "no"); | |
779 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
780 | seq_printf(m, "min keysize : %u\n", skcipher->min_keysize); | |
781 | seq_printf(m, "max keysize : %u\n", skcipher->max_keysize); | |
782 | seq_printf(m, "ivsize : %u\n", skcipher->ivsize); | |
783 | seq_printf(m, "chunksize : %u\n", skcipher->chunksize); | |
c821f6ab | 784 | seq_printf(m, "walksize : %u\n", skcipher->walksize); |
662ea18d | 785 | seq_printf(m, "statesize : %u\n", skcipher->statesize); |
7a7ffe65 HX |
786 | } |
787 | ||
c0f9e01d HX |
788 | static int __maybe_unused crypto_skcipher_report( |
789 | struct sk_buff *skb, struct crypto_alg *alg) | |
4e6c3df4 | 790 | { |
1085680b | 791 | struct skcipher_alg *skcipher = __crypto_skcipher_alg(alg); |
4e6c3df4 | 792 | struct crypto_report_blkcipher rblkcipher; |
4e6c3df4 | 793 | |
37db69e0 EB |
794 | memset(&rblkcipher, 0, sizeof(rblkcipher)); |
795 | ||
796 | strscpy(rblkcipher.type, "skcipher", sizeof(rblkcipher.type)); | |
797 | strscpy(rblkcipher.geniv, "<none>", sizeof(rblkcipher.geniv)); | |
4e6c3df4 HX |
798 | |
799 | rblkcipher.blocksize = alg->cra_blocksize; | |
800 | rblkcipher.min_keysize = skcipher->min_keysize; | |
801 | rblkcipher.max_keysize = skcipher->max_keysize; | |
802 | rblkcipher.ivsize = skcipher->ivsize; | |
803 | ||
37db69e0 EB |
804 | return nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER, |
805 | sizeof(rblkcipher), &rblkcipher); | |
4e6c3df4 | 806 | } |
4e6c3df4 | 807 | |
53253064 | 808 | static const struct crypto_type crypto_skcipher_type = { |
31865c4c | 809 | .extsize = crypto_skcipher_extsize, |
7a7ffe65 | 810 | .init_tfm = crypto_skcipher_init_tfm, |
4e6c3df4 HX |
811 | .free = crypto_skcipher_free_instance, |
812 | #ifdef CONFIG_PROC_FS | |
813 | .show = crypto_skcipher_show, | |
814 | #endif | |
b8969a1b | 815 | #if IS_ENABLED(CONFIG_CRYPTO_USER) |
4e6c3df4 | 816 | .report = crypto_skcipher_report, |
1085680b | 817 | #endif |
7a7ffe65 | 818 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, |
31865c4c | 819 | .maskset = CRYPTO_ALG_TYPE_SKCIPHER_MASK, |
4e6c3df4 | 820 | .type = CRYPTO_ALG_TYPE_SKCIPHER, |
7a7ffe65 HX |
821 | .tfmsize = offsetof(struct crypto_skcipher, base), |
822 | }; | |
823 | ||
3a01d0ee | 824 | int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, |
b9f76ddd EB |
825 | struct crypto_instance *inst, |
826 | const char *name, u32 type, u32 mask) | |
4e6c3df4 | 827 | { |
53253064 | 828 | spawn->base.frontend = &crypto_skcipher_type; |
de95c957 | 829 | return crypto_grab_spawn(&spawn->base, inst, name, type, mask); |
4e6c3df4 | 830 | } |
3a01d0ee | 831 | EXPORT_SYMBOL_GPL(crypto_grab_skcipher); |
4e6c3df4 | 832 | |
7a7ffe65 HX |
833 | struct crypto_skcipher *crypto_alloc_skcipher(const char *alg_name, |
834 | u32 type, u32 mask) | |
835 | { | |
53253064 | 836 | return crypto_alloc_tfm(alg_name, &crypto_skcipher_type, type, mask); |
7a7ffe65 HX |
837 | } |
838 | EXPORT_SYMBOL_GPL(crypto_alloc_skcipher); | |
839 | ||
b350bee5 KC |
840 | struct crypto_sync_skcipher *crypto_alloc_sync_skcipher( |
841 | const char *alg_name, u32 type, u32 mask) | |
842 | { | |
843 | struct crypto_skcipher *tfm; | |
844 | ||
845 | /* Only sync algorithms allowed. */ | |
e6cb02bd | 846 | mask |= CRYPTO_ALG_ASYNC | CRYPTO_ALG_SKCIPHER_REQSIZE_LARGE; |
b350bee5 | 847 | |
53253064 | 848 | tfm = crypto_alloc_tfm(alg_name, &crypto_skcipher_type, type, mask); |
b350bee5 KC |
849 | |
850 | /* | |
851 | * Make sure we do not allocate something that might get used with | |
852 | * an on-stack request: check the request size. | |
853 | */ | |
854 | if (!IS_ERR(tfm) && WARN_ON(crypto_skcipher_reqsize(tfm) > | |
855 | MAX_SYNC_SKCIPHER_REQSIZE)) { | |
856 | crypto_free_skcipher(tfm); | |
857 | return ERR_PTR(-EINVAL); | |
858 | } | |
859 | ||
860 | return (struct crypto_sync_skcipher *)tfm; | |
861 | } | |
862 | EXPORT_SYMBOL_GPL(crypto_alloc_sync_skcipher); | |
863 | ||
d3ca75a8 | 864 | int crypto_has_skcipher(const char *alg_name, u32 type, u32 mask) |
4e6c3df4 | 865 | { |
53253064 | 866 | return crypto_type_has_alg(alg_name, &crypto_skcipher_type, type, mask); |
4e6c3df4 | 867 | } |
d3ca75a8 | 868 | EXPORT_SYMBOL_GPL(crypto_has_skcipher); |
4e6c3df4 | 869 | |
31865c4c | 870 | int skcipher_prepare_alg_common(struct skcipher_alg_common *alg) |
4e6c3df4 HX |
871 | { |
872 | struct crypto_alg *base = &alg->base; | |
873 | ||
662ea18d HX |
874 | if (alg->ivsize > PAGE_SIZE / 8 || alg->chunksize > PAGE_SIZE / 8 || |
875 | alg->statesize > PAGE_SIZE / 2 || | |
876 | (alg->ivsize + alg->statesize) > PAGE_SIZE / 2) | |
4e6c3df4 HX |
877 | return -EINVAL; |
878 | ||
879 | if (!alg->chunksize) | |
880 | alg->chunksize = base->cra_blocksize; | |
881 | ||
4e6c3df4 | 882 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; |
4e6c3df4 HX |
883 | |
884 | return 0; | |
885 | } | |
886 | ||
31865c4c HX |
887 | static int skcipher_prepare_alg(struct skcipher_alg *alg) |
888 | { | |
889 | struct crypto_alg *base = &alg->base; | |
890 | int err; | |
891 | ||
892 | err = skcipher_prepare_alg_common(&alg->co); | |
893 | if (err) | |
894 | return err; | |
895 | ||
896 | if (alg->walksize > PAGE_SIZE / 8) | |
897 | return -EINVAL; | |
898 | ||
899 | if (!alg->walksize) | |
900 | alg->walksize = alg->chunksize; | |
901 | ||
662ea18d HX |
902 | if (!alg->statesize) { |
903 | alg->import = skcipher_noimport; | |
904 | alg->export = skcipher_noexport; | |
905 | } else if (!(alg->import && alg->export)) | |
906 | return -EINVAL; | |
907 | ||
31865c4c HX |
908 | base->cra_type = &crypto_skcipher_type; |
909 | base->cra_flags |= CRYPTO_ALG_TYPE_SKCIPHER; | |
910 | ||
911 | return 0; | |
912 | } | |
913 | ||
4e6c3df4 HX |
914 | int crypto_register_skcipher(struct skcipher_alg *alg) |
915 | { | |
916 | struct crypto_alg *base = &alg->base; | |
917 | int err; | |
918 | ||
919 | err = skcipher_prepare_alg(alg); | |
920 | if (err) | |
921 | return err; | |
922 | ||
923 | return crypto_register_alg(base); | |
924 | } | |
925 | EXPORT_SYMBOL_GPL(crypto_register_skcipher); | |
926 | ||
927 | void crypto_unregister_skcipher(struct skcipher_alg *alg) | |
928 | { | |
929 | crypto_unregister_alg(&alg->base); | |
930 | } | |
931 | EXPORT_SYMBOL_GPL(crypto_unregister_skcipher); | |
932 | ||
933 | int crypto_register_skciphers(struct skcipher_alg *algs, int count) | |
934 | { | |
935 | int i, ret; | |
936 | ||
937 | for (i = 0; i < count; i++) { | |
938 | ret = crypto_register_skcipher(&algs[i]); | |
939 | if (ret) | |
940 | goto err; | |
941 | } | |
942 | ||
943 | return 0; | |
944 | ||
945 | err: | |
946 | for (--i; i >= 0; --i) | |
947 | crypto_unregister_skcipher(&algs[i]); | |
948 | ||
949 | return ret; | |
950 | } | |
951 | EXPORT_SYMBOL_GPL(crypto_register_skciphers); | |
952 | ||
953 | void crypto_unregister_skciphers(struct skcipher_alg *algs, int count) | |
954 | { | |
955 | int i; | |
956 | ||
957 | for (i = count - 1; i >= 0; --i) | |
958 | crypto_unregister_skcipher(&algs[i]); | |
959 | } | |
960 | EXPORT_SYMBOL_GPL(crypto_unregister_skciphers); | |
961 | ||
962 | int skcipher_register_instance(struct crypto_template *tmpl, | |
963 | struct skcipher_instance *inst) | |
964 | { | |
965 | int err; | |
966 | ||
d4fdc2df EB |
967 | if (WARN_ON(!inst->free)) |
968 | return -EINVAL; | |
969 | ||
4e6c3df4 HX |
970 | err = skcipher_prepare_alg(&inst->alg); |
971 | if (err) | |
972 | return err; | |
973 | ||
974 | return crypto_register_instance(tmpl, skcipher_crypto_instance(inst)); | |
975 | } | |
976 | EXPORT_SYMBOL_GPL(skcipher_register_instance); | |
977 | ||
0872da16 EB |
978 | static int skcipher_setkey_simple(struct crypto_skcipher *tfm, const u8 *key, |
979 | unsigned int keylen) | |
980 | { | |
981 | struct crypto_cipher *cipher = skcipher_cipher_simple(tfm); | |
0872da16 EB |
982 | |
983 | crypto_cipher_clear_flags(cipher, CRYPTO_TFM_REQ_MASK); | |
984 | crypto_cipher_set_flags(cipher, crypto_skcipher_get_flags(tfm) & | |
985 | CRYPTO_TFM_REQ_MASK); | |
af5034e8 | 986 | return crypto_cipher_setkey(cipher, key, keylen); |
0872da16 EB |
987 | } |
988 | ||
989 | static int skcipher_init_tfm_simple(struct crypto_skcipher *tfm) | |
990 | { | |
991 | struct skcipher_instance *inst = skcipher_alg_instance(tfm); | |
d5ed3b65 | 992 | struct crypto_cipher_spawn *spawn = skcipher_instance_ctx(inst); |
0872da16 EB |
993 | struct skcipher_ctx_simple *ctx = crypto_skcipher_ctx(tfm); |
994 | struct crypto_cipher *cipher; | |
995 | ||
996 | cipher = crypto_spawn_cipher(spawn); | |
997 | if (IS_ERR(cipher)) | |
998 | return PTR_ERR(cipher); | |
999 | ||
1000 | ctx->cipher = cipher; | |
1001 | return 0; | |
1002 | } | |
1003 | ||
1004 | static void skcipher_exit_tfm_simple(struct crypto_skcipher *tfm) | |
1005 | { | |
1006 | struct skcipher_ctx_simple *ctx = crypto_skcipher_ctx(tfm); | |
1007 | ||
1008 | crypto_free_cipher(ctx->cipher); | |
1009 | } | |
1010 | ||
1011 | static void skcipher_free_instance_simple(struct skcipher_instance *inst) | |
1012 | { | |
aacd5b4c | 1013 | crypto_drop_cipher(skcipher_instance_ctx(inst)); |
0872da16 EB |
1014 | kfree(inst); |
1015 | } | |
1016 | ||
1017 | /** | |
1018 | * skcipher_alloc_instance_simple - allocate instance of simple block cipher mode | |
1019 | * | |
1020 | * Allocate an skcipher_instance for a simple block cipher mode of operation, | |
1021 | * e.g. cbc or ecb. The instance context will have just a single crypto_spawn, | |
1022 | * that for the underlying cipher. The {min,max}_keysize, ivsize, blocksize, | |
1023 | * alignmask, and priority are set from the underlying cipher but can be | |
1024 | * overridden if needed. The tfm context defaults to skcipher_ctx_simple, and | |
1025 | * default ->setkey(), ->init(), and ->exit() methods are installed. | |
1026 | * | |
1027 | * @tmpl: the template being instantiated | |
1028 | * @tb: the template parameters | |
0872da16 EB |
1029 | * |
1030 | * Return: a pointer to the new instance, or an ERR_PTR(). The caller still | |
1031 | * needs to register the instance. | |
1032 | */ | |
b3c16bfc HX |
1033 | struct skcipher_instance *skcipher_alloc_instance_simple( |
1034 | struct crypto_template *tmpl, struct rtattr **tb) | |
0872da16 | 1035 | { |
0872da16 | 1036 | u32 mask; |
aacd5b4c EB |
1037 | struct skcipher_instance *inst; |
1038 | struct crypto_cipher_spawn *spawn; | |
1039 | struct crypto_alg *cipher_alg; | |
0872da16 EB |
1040 | int err; |
1041 | ||
7bcb2c99 EB |
1042 | err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SKCIPHER, &mask); |
1043 | if (err) | |
1044 | return ERR_PTR(err); | |
0872da16 EB |
1045 | |
1046 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); | |
aacd5b4c EB |
1047 | if (!inst) |
1048 | return ERR_PTR(-ENOMEM); | |
0872da16 EB |
1049 | spawn = skcipher_instance_ctx(inst); |
1050 | ||
aacd5b4c EB |
1051 | err = crypto_grab_cipher(spawn, skcipher_crypto_instance(inst), |
1052 | crypto_attr_alg_name(tb[1]), 0, mask); | |
0872da16 EB |
1053 | if (err) |
1054 | goto err_free_inst; | |
aacd5b4c | 1055 | cipher_alg = crypto_spawn_cipher_alg(spawn); |
0872da16 | 1056 | |
aacd5b4c EB |
1057 | err = crypto_inst_setname(skcipher_crypto_instance(inst), tmpl->name, |
1058 | cipher_alg); | |
0872da16 EB |
1059 | if (err) |
1060 | goto err_free_inst; | |
aacd5b4c | 1061 | |
0872da16 EB |
1062 | inst->free = skcipher_free_instance_simple; |
1063 | ||
1064 | /* Default algorithm properties, can be overridden */ | |
1065 | inst->alg.base.cra_blocksize = cipher_alg->cra_blocksize; | |
1066 | inst->alg.base.cra_alignmask = cipher_alg->cra_alignmask; | |
1067 | inst->alg.base.cra_priority = cipher_alg->cra_priority; | |
1068 | inst->alg.min_keysize = cipher_alg->cra_cipher.cia_min_keysize; | |
1069 | inst->alg.max_keysize = cipher_alg->cra_cipher.cia_max_keysize; | |
1070 | inst->alg.ivsize = cipher_alg->cra_blocksize; | |
1071 | ||
1072 | /* Use skcipher_ctx_simple by default, can be overridden */ | |
1073 | inst->alg.base.cra_ctxsize = sizeof(struct skcipher_ctx_simple); | |
1074 | inst->alg.setkey = skcipher_setkey_simple; | |
1075 | inst->alg.init = skcipher_init_tfm_simple; | |
1076 | inst->alg.exit = skcipher_exit_tfm_simple; | |
1077 | ||
0872da16 EB |
1078 | return inst; |
1079 | ||
1080 | err_free_inst: | |
aacd5b4c | 1081 | skcipher_free_instance_simple(inst); |
0872da16 EB |
1082 | return ERR_PTR(err); |
1083 | } | |
1084 | EXPORT_SYMBOL_GPL(skcipher_alloc_instance_simple); | |
1085 | ||
7a7ffe65 HX |
1086 | MODULE_LICENSE("GPL"); |
1087 | MODULE_DESCRIPTION("Symmetric key cipher type"); | |
0eb76ba2 | 1088 | MODULE_IMPORT_NS(CRYPTO_INTERNAL); |