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> |
7a7ffe65 HX |
27 | |
28 | #include "internal.h" | |
29 | ||
b286d8b1 HX |
30 | enum { |
31 | SKCIPHER_WALK_PHYS = 1 << 0, | |
32 | SKCIPHER_WALK_SLOW = 1 << 1, | |
33 | SKCIPHER_WALK_COPY = 1 << 2, | |
34 | SKCIPHER_WALK_DIFF = 1 << 3, | |
35 | SKCIPHER_WALK_SLEEP = 1 << 4, | |
36 | }; | |
37 | ||
38 | struct skcipher_walk_buffer { | |
39 | struct list_head entry; | |
40 | struct scatter_walk dst; | |
41 | unsigned int len; | |
42 | u8 *data; | |
43 | u8 buffer[]; | |
44 | }; | |
45 | ||
46 | static int skcipher_walk_next(struct skcipher_walk *walk); | |
47 | ||
b286d8b1 HX |
48 | static inline void skcipher_map_src(struct skcipher_walk *walk) |
49 | { | |
d07bd950 | 50 | walk->src.virt.addr = scatterwalk_map(&walk->in); |
b286d8b1 HX |
51 | } |
52 | ||
53 | static inline void skcipher_map_dst(struct skcipher_walk *walk) | |
54 | { | |
d07bd950 | 55 | walk->dst.virt.addr = scatterwalk_map(&walk->out); |
b286d8b1 HX |
56 | } |
57 | ||
58 | static inline void skcipher_unmap_src(struct skcipher_walk *walk) | |
59 | { | |
d07bd950 | 60 | scatterwalk_unmap(walk->src.virt.addr); |
b286d8b1 HX |
61 | } |
62 | ||
63 | static inline void skcipher_unmap_dst(struct skcipher_walk *walk) | |
64 | { | |
d07bd950 | 65 | scatterwalk_unmap(walk->dst.virt.addr); |
b286d8b1 HX |
66 | } |
67 | ||
68 | static inline gfp_t skcipher_walk_gfp(struct skcipher_walk *walk) | |
69 | { | |
70 | return walk->flags & SKCIPHER_WALK_SLEEP ? GFP_KERNEL : GFP_ATOMIC; | |
71 | } | |
72 | ||
73 | /* Get a spot of the specified length that does not straddle a page. | |
74 | * The caller needs to ensure that there is enough space for this operation. | |
75 | */ | |
76 | static inline u8 *skcipher_get_spot(u8 *start, unsigned int len) | |
77 | { | |
78 | u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK); | |
79 | ||
80 | return max(start, end_page); | |
81 | } | |
82 | ||
1085680b HX |
83 | static inline struct skcipher_alg *__crypto_skcipher_alg( |
84 | struct crypto_alg *alg) | |
85 | { | |
86 | return container_of(alg, struct skcipher_alg, base); | |
87 | } | |
88 | ||
89 | static inline struct crypto_istat_cipher *skcipher_get_stat( | |
90 | struct skcipher_alg *alg) | |
91 | { | |
92 | #ifdef CONFIG_CRYPTO_STATS | |
93 | return &alg->stat; | |
94 | #else | |
95 | return NULL; | |
96 | #endif | |
97 | } | |
98 | ||
99 | static inline int crypto_skcipher_errstat(struct skcipher_alg *alg, int err) | |
100 | { | |
101 | struct crypto_istat_cipher *istat = skcipher_get_stat(alg); | |
102 | ||
103 | if (!IS_ENABLED(CONFIG_CRYPTO_STATS)) | |
104 | return err; | |
105 | ||
106 | if (err && err != -EINPROGRESS && err != -EBUSY) | |
107 | atomic64_inc(&istat->err_cnt); | |
108 | ||
109 | return err; | |
110 | } | |
111 | ||
0ba3c026 | 112 | static int skcipher_done_slow(struct skcipher_walk *walk, unsigned int bsize) |
b286d8b1 HX |
113 | { |
114 | u8 *addr; | |
115 | ||
116 | addr = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1); | |
117 | addr = skcipher_get_spot(addr, bsize); | |
118 | scatterwalk_copychunks(addr, &walk->out, bsize, | |
119 | (walk->flags & SKCIPHER_WALK_PHYS) ? 2 : 1); | |
0ba3c026 | 120 | return 0; |
b286d8b1 HX |
121 | } |
122 | ||
123 | int skcipher_walk_done(struct skcipher_walk *walk, int err) | |
124 | { | |
0ba3c026 HX |
125 | unsigned int n = walk->nbytes; |
126 | unsigned int nbytes = 0; | |
8088d3dd | 127 | |
0ba3c026 | 128 | if (!n) |
8088d3dd EB |
129 | goto finish; |
130 | ||
0ba3c026 HX |
131 | if (likely(err >= 0)) { |
132 | n -= err; | |
133 | nbytes = walk->total - n; | |
134 | } | |
8088d3dd EB |
135 | |
136 | if (likely(!(walk->flags & (SKCIPHER_WALK_PHYS | | |
137 | SKCIPHER_WALK_SLOW | | |
138 | SKCIPHER_WALK_COPY | | |
139 | SKCIPHER_WALK_DIFF)))) { | |
b286d8b1 HX |
140 | unmap_src: |
141 | skcipher_unmap_src(walk); | |
142 | } else if (walk->flags & SKCIPHER_WALK_DIFF) { | |
143 | skcipher_unmap_dst(walk); | |
144 | goto unmap_src; | |
145 | } else if (walk->flags & SKCIPHER_WALK_COPY) { | |
146 | skcipher_map_dst(walk); | |
147 | memcpy(walk->dst.virt.addr, walk->page, n); | |
148 | skcipher_unmap_dst(walk); | |
149 | } else if (unlikely(walk->flags & SKCIPHER_WALK_SLOW)) { | |
0ba3c026 | 150 | if (err > 0) { |
dcaca01a EB |
151 | /* |
152 | * Didn't process all bytes. Either the algorithm is | |
153 | * broken, or this was the last step and it turned out | |
154 | * the message wasn't evenly divisible into blocks but | |
155 | * the algorithm requires it. | |
156 | */ | |
b286d8b1 | 157 | err = -EINVAL; |
0ba3c026 HX |
158 | nbytes = 0; |
159 | } else | |
160 | n = skcipher_done_slow(walk, n); | |
b286d8b1 HX |
161 | } |
162 | ||
0ba3c026 HX |
163 | if (err > 0) |
164 | err = 0; | |
165 | ||
166 | walk->total = nbytes; | |
167 | walk->nbytes = 0; | |
168 | ||
b286d8b1 HX |
169 | scatterwalk_advance(&walk->in, n); |
170 | scatterwalk_advance(&walk->out, n); | |
0ba3c026 HX |
171 | scatterwalk_done(&walk->in, 0, nbytes); |
172 | scatterwalk_done(&walk->out, 1, nbytes); | |
b286d8b1 | 173 | |
0ba3c026 | 174 | if (nbytes) { |
b286d8b1 HX |
175 | crypto_yield(walk->flags & SKCIPHER_WALK_SLEEP ? |
176 | CRYPTO_TFM_REQ_MAY_SLEEP : 0); | |
177 | return skcipher_walk_next(walk); | |
178 | } | |
179 | ||
0ba3c026 | 180 | finish: |
b286d8b1 HX |
181 | /* Short-circuit for the common/fast path. */ |
182 | if (!((unsigned long)walk->buffer | (unsigned long)walk->page)) | |
183 | goto out; | |
184 | ||
185 | if (walk->flags & SKCIPHER_WALK_PHYS) | |
186 | goto out; | |
187 | ||
188 | if (walk->iv != walk->oiv) | |
189 | memcpy(walk->oiv, walk->iv, walk->ivsize); | |
190 | if (walk->buffer != walk->page) | |
191 | kfree(walk->buffer); | |
192 | if (walk->page) | |
193 | free_page((unsigned long)walk->page); | |
194 | ||
195 | out: | |
196 | return err; | |
197 | } | |
198 | EXPORT_SYMBOL_GPL(skcipher_walk_done); | |
199 | ||
200 | void skcipher_walk_complete(struct skcipher_walk *walk, int err) | |
201 | { | |
202 | struct skcipher_walk_buffer *p, *tmp; | |
203 | ||
204 | list_for_each_entry_safe(p, tmp, &walk->buffers, entry) { | |
205 | u8 *data; | |
206 | ||
207 | if (err) | |
208 | goto done; | |
209 | ||
210 | data = p->data; | |
211 | if (!data) { | |
212 | data = PTR_ALIGN(&p->buffer[0], walk->alignmask + 1); | |
c821f6ab | 213 | data = skcipher_get_spot(data, walk->stride); |
b286d8b1 HX |
214 | } |
215 | ||
216 | scatterwalk_copychunks(data, &p->dst, p->len, 1); | |
217 | ||
c821f6ab | 218 | if (offset_in_page(p->data) + p->len + walk->stride > |
b286d8b1 HX |
219 | PAGE_SIZE) |
220 | free_page((unsigned long)p->data); | |
221 | ||
222 | done: | |
223 | list_del(&p->entry); | |
224 | kfree(p); | |
225 | } | |
226 | ||
227 | if (!err && walk->iv != walk->oiv) | |
228 | memcpy(walk->oiv, walk->iv, walk->ivsize); | |
229 | if (walk->buffer != walk->page) | |
230 | kfree(walk->buffer); | |
231 | if (walk->page) | |
232 | free_page((unsigned long)walk->page); | |
233 | } | |
234 | EXPORT_SYMBOL_GPL(skcipher_walk_complete); | |
235 | ||
236 | static void skcipher_queue_write(struct skcipher_walk *walk, | |
237 | struct skcipher_walk_buffer *p) | |
238 | { | |
239 | p->dst = walk->out; | |
240 | list_add_tail(&p->entry, &walk->buffers); | |
241 | } | |
242 | ||
243 | static int skcipher_next_slow(struct skcipher_walk *walk, unsigned int bsize) | |
244 | { | |
245 | bool phys = walk->flags & SKCIPHER_WALK_PHYS; | |
246 | unsigned alignmask = walk->alignmask; | |
247 | struct skcipher_walk_buffer *p; | |
248 | unsigned a; | |
249 | unsigned n; | |
250 | u8 *buffer; | |
251 | void *v; | |
252 | ||
253 | if (!phys) { | |
18e615ad AB |
254 | if (!walk->buffer) |
255 | walk->buffer = walk->page; | |
256 | buffer = walk->buffer; | |
b286d8b1 HX |
257 | if (buffer) |
258 | goto ok; | |
259 | } | |
260 | ||
261 | /* Start with the minimum alignment of kmalloc. */ | |
262 | a = crypto_tfm_ctx_alignment() - 1; | |
263 | n = bsize; | |
264 | ||
265 | if (phys) { | |
266 | /* Calculate the minimum alignment of p->buffer. */ | |
267 | a &= (sizeof(*p) ^ (sizeof(*p) - 1)) >> 1; | |
268 | n += sizeof(*p); | |
269 | } | |
270 | ||
271 | /* Minimum size to align p->buffer by alignmask. */ | |
272 | n += alignmask & ~a; | |
273 | ||
274 | /* Minimum size to ensure p->buffer does not straddle a page. */ | |
275 | n += (bsize - 1) & ~(alignmask | a); | |
276 | ||
277 | v = kzalloc(n, skcipher_walk_gfp(walk)); | |
278 | if (!v) | |
279 | return skcipher_walk_done(walk, -ENOMEM); | |
280 | ||
281 | if (phys) { | |
282 | p = v; | |
283 | p->len = bsize; | |
284 | skcipher_queue_write(walk, p); | |
285 | buffer = p->buffer; | |
286 | } else { | |
287 | walk->buffer = v; | |
288 | buffer = v; | |
289 | } | |
290 | ||
291 | ok: | |
292 | walk->dst.virt.addr = PTR_ALIGN(buffer, alignmask + 1); | |
293 | walk->dst.virt.addr = skcipher_get_spot(walk->dst.virt.addr, bsize); | |
294 | walk->src.virt.addr = walk->dst.virt.addr; | |
295 | ||
296 | scatterwalk_copychunks(walk->src.virt.addr, &walk->in, bsize, 0); | |
297 | ||
298 | walk->nbytes = bsize; | |
299 | walk->flags |= SKCIPHER_WALK_SLOW; | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
304 | static int skcipher_next_copy(struct skcipher_walk *walk) | |
305 | { | |
306 | struct skcipher_walk_buffer *p; | |
307 | u8 *tmp = walk->page; | |
308 | ||
309 | skcipher_map_src(walk); | |
310 | memcpy(tmp, walk->src.virt.addr, walk->nbytes); | |
311 | skcipher_unmap_src(walk); | |
312 | ||
313 | walk->src.virt.addr = tmp; | |
314 | walk->dst.virt.addr = tmp; | |
315 | ||
316 | if (!(walk->flags & SKCIPHER_WALK_PHYS)) | |
317 | return 0; | |
318 | ||
319 | p = kmalloc(sizeof(*p), skcipher_walk_gfp(walk)); | |
320 | if (!p) | |
321 | return -ENOMEM; | |
322 | ||
323 | p->data = walk->page; | |
324 | p->len = walk->nbytes; | |
325 | skcipher_queue_write(walk, p); | |
326 | ||
c821f6ab | 327 | if (offset_in_page(walk->page) + walk->nbytes + walk->stride > |
b286d8b1 HX |
328 | PAGE_SIZE) |
329 | walk->page = NULL; | |
330 | else | |
331 | walk->page += walk->nbytes; | |
332 | ||
333 | return 0; | |
334 | } | |
335 | ||
336 | static int skcipher_next_fast(struct skcipher_walk *walk) | |
337 | { | |
338 | unsigned long diff; | |
339 | ||
340 | walk->src.phys.page = scatterwalk_page(&walk->in); | |
341 | walk->src.phys.offset = offset_in_page(walk->in.offset); | |
342 | walk->dst.phys.page = scatterwalk_page(&walk->out); | |
343 | walk->dst.phys.offset = offset_in_page(walk->out.offset); | |
344 | ||
345 | if (walk->flags & SKCIPHER_WALK_PHYS) | |
346 | return 0; | |
347 | ||
348 | diff = walk->src.phys.offset - walk->dst.phys.offset; | |
349 | diff |= walk->src.virt.page - walk->dst.virt.page; | |
350 | ||
351 | skcipher_map_src(walk); | |
352 | walk->dst.virt.addr = walk->src.virt.addr; | |
353 | ||
354 | if (diff) { | |
355 | walk->flags |= SKCIPHER_WALK_DIFF; | |
356 | skcipher_map_dst(walk); | |
357 | } | |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
362 | static int skcipher_walk_next(struct skcipher_walk *walk) | |
363 | { | |
364 | unsigned int bsize; | |
365 | unsigned int n; | |
366 | int err; | |
367 | ||
368 | walk->flags &= ~(SKCIPHER_WALK_SLOW | SKCIPHER_WALK_COPY | | |
369 | SKCIPHER_WALK_DIFF); | |
370 | ||
371 | n = walk->total; | |
c821f6ab | 372 | bsize = min(walk->stride, max(n, walk->blocksize)); |
b286d8b1 HX |
373 | n = scatterwalk_clamp(&walk->in, n); |
374 | n = scatterwalk_clamp(&walk->out, n); | |
375 | ||
376 | if (unlikely(n < bsize)) { | |
377 | if (unlikely(walk->total < walk->blocksize)) | |
378 | return skcipher_walk_done(walk, -EINVAL); | |
379 | ||
380 | slow_path: | |
381 | err = skcipher_next_slow(walk, bsize); | |
382 | goto set_phys_lowmem; | |
383 | } | |
384 | ||
385 | if (unlikely((walk->in.offset | walk->out.offset) & walk->alignmask)) { | |
386 | if (!walk->page) { | |
387 | gfp_t gfp = skcipher_walk_gfp(walk); | |
388 | ||
389 | walk->page = (void *)__get_free_page(gfp); | |
390 | if (!walk->page) | |
391 | goto slow_path; | |
392 | } | |
393 | ||
394 | walk->nbytes = min_t(unsigned, n, | |
395 | PAGE_SIZE - offset_in_page(walk->page)); | |
396 | walk->flags |= SKCIPHER_WALK_COPY; | |
397 | err = skcipher_next_copy(walk); | |
398 | goto set_phys_lowmem; | |
399 | } | |
400 | ||
401 | walk->nbytes = n; | |
402 | ||
403 | return skcipher_next_fast(walk); | |
404 | ||
405 | set_phys_lowmem: | |
406 | if (!err && (walk->flags & SKCIPHER_WALK_PHYS)) { | |
407 | walk->src.phys.page = virt_to_page(walk->src.virt.addr); | |
408 | walk->dst.phys.page = virt_to_page(walk->dst.virt.addr); | |
409 | walk->src.phys.offset &= PAGE_SIZE - 1; | |
410 | walk->dst.phys.offset &= PAGE_SIZE - 1; | |
411 | } | |
412 | return err; | |
413 | } | |
b286d8b1 HX |
414 | |
415 | static int skcipher_copy_iv(struct skcipher_walk *walk) | |
416 | { | |
417 | unsigned a = crypto_tfm_ctx_alignment() - 1; | |
418 | unsigned alignmask = walk->alignmask; | |
419 | unsigned ivsize = walk->ivsize; | |
c821f6ab | 420 | unsigned bs = walk->stride; |
b286d8b1 HX |
421 | unsigned aligned_bs; |
422 | unsigned size; | |
423 | u8 *iv; | |
424 | ||
0567fc9e | 425 | aligned_bs = ALIGN(bs, alignmask + 1); |
b286d8b1 HX |
426 | |
427 | /* Minimum size to align buffer by alignmask. */ | |
428 | size = alignmask & ~a; | |
429 | ||
430 | if (walk->flags & SKCIPHER_WALK_PHYS) | |
431 | size += ivsize; | |
432 | else { | |
433 | size += aligned_bs + ivsize; | |
434 | ||
435 | /* Minimum size to ensure buffer does not straddle a page. */ | |
436 | size += (bs - 1) & ~(alignmask | a); | |
437 | } | |
438 | ||
439 | walk->buffer = kmalloc(size, skcipher_walk_gfp(walk)); | |
440 | if (!walk->buffer) | |
441 | return -ENOMEM; | |
442 | ||
443 | iv = PTR_ALIGN(walk->buffer, alignmask + 1); | |
444 | iv = skcipher_get_spot(iv, bs) + aligned_bs; | |
445 | ||
446 | walk->iv = memcpy(iv, walk->iv, walk->ivsize); | |
447 | return 0; | |
448 | } | |
449 | ||
450 | static int skcipher_walk_first(struct skcipher_walk *walk) | |
451 | { | |
abfc7fad | 452 | if (WARN_ON_ONCE(in_hardirq())) |
b286d8b1 HX |
453 | return -EDEADLK; |
454 | ||
b286d8b1 HX |
455 | walk->buffer = NULL; |
456 | if (unlikely(((unsigned long)walk->iv & walk->alignmask))) { | |
457 | int err = skcipher_copy_iv(walk); | |
458 | if (err) | |
459 | return err; | |
460 | } | |
461 | ||
462 | walk->page = NULL; | |
b286d8b1 HX |
463 | |
464 | return skcipher_walk_next(walk); | |
465 | } | |
466 | ||
467 | static int skcipher_walk_skcipher(struct skcipher_walk *walk, | |
468 | struct skcipher_request *req) | |
469 | { | |
470 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
471 | ||
0cabf2af HX |
472 | walk->total = req->cryptlen; |
473 | walk->nbytes = 0; | |
2b4f27c3 EB |
474 | walk->iv = req->iv; |
475 | walk->oiv = req->iv; | |
0cabf2af HX |
476 | |
477 | if (unlikely(!walk->total)) | |
478 | return 0; | |
479 | ||
b286d8b1 HX |
480 | scatterwalk_start(&walk->in, req->src); |
481 | scatterwalk_start(&walk->out, req->dst); | |
482 | ||
b286d8b1 HX |
483 | walk->flags &= ~SKCIPHER_WALK_SLEEP; |
484 | walk->flags |= req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? | |
485 | SKCIPHER_WALK_SLEEP : 0; | |
486 | ||
487 | walk->blocksize = crypto_skcipher_blocksize(tfm); | |
c821f6ab | 488 | walk->stride = crypto_skcipher_walksize(tfm); |
b286d8b1 HX |
489 | walk->ivsize = crypto_skcipher_ivsize(tfm); |
490 | walk->alignmask = crypto_skcipher_alignmask(tfm); | |
491 | ||
492 | return skcipher_walk_first(walk); | |
493 | } | |
494 | ||
495 | int skcipher_walk_virt(struct skcipher_walk *walk, | |
496 | struct skcipher_request *req, bool atomic) | |
497 | { | |
498 | int err; | |
499 | ||
bb648291 EB |
500 | might_sleep_if(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP); |
501 | ||
b286d8b1 HX |
502 | walk->flags &= ~SKCIPHER_WALK_PHYS; |
503 | ||
504 | err = skcipher_walk_skcipher(walk, req); | |
505 | ||
506 | walk->flags &= atomic ? ~SKCIPHER_WALK_SLEEP : ~0; | |
507 | ||
508 | return err; | |
509 | } | |
510 | EXPORT_SYMBOL_GPL(skcipher_walk_virt); | |
511 | ||
b286d8b1 HX |
512 | int skcipher_walk_async(struct skcipher_walk *walk, |
513 | struct skcipher_request *req) | |
514 | { | |
515 | walk->flags |= SKCIPHER_WALK_PHYS; | |
516 | ||
517 | INIT_LIST_HEAD(&walk->buffers); | |
518 | ||
519 | return skcipher_walk_skcipher(walk, req); | |
520 | } | |
521 | EXPORT_SYMBOL_GPL(skcipher_walk_async); | |
522 | ||
34bc085c HX |
523 | static int skcipher_walk_aead_common(struct skcipher_walk *walk, |
524 | struct aead_request *req, bool atomic) | |
b286d8b1 HX |
525 | { |
526 | struct crypto_aead *tfm = crypto_aead_reqtfm(req); | |
527 | int err; | |
528 | ||
0cabf2af | 529 | walk->nbytes = 0; |
2b4f27c3 EB |
530 | walk->iv = req->iv; |
531 | walk->oiv = req->iv; | |
0cabf2af HX |
532 | |
533 | if (unlikely(!walk->total)) | |
534 | return 0; | |
535 | ||
3cbf61fb AB |
536 | walk->flags &= ~SKCIPHER_WALK_PHYS; |
537 | ||
b286d8b1 HX |
538 | scatterwalk_start(&walk->in, req->src); |
539 | scatterwalk_start(&walk->out, req->dst); | |
540 | ||
541 | scatterwalk_copychunks(NULL, &walk->in, req->assoclen, 2); | |
542 | scatterwalk_copychunks(NULL, &walk->out, req->assoclen, 2); | |
543 | ||
c14ca838 OM |
544 | scatterwalk_done(&walk->in, 0, walk->total); |
545 | scatterwalk_done(&walk->out, 0, walk->total); | |
546 | ||
b286d8b1 HX |
547 | if (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) |
548 | walk->flags |= SKCIPHER_WALK_SLEEP; | |
549 | else | |
550 | walk->flags &= ~SKCIPHER_WALK_SLEEP; | |
551 | ||
552 | walk->blocksize = crypto_aead_blocksize(tfm); | |
c821f6ab | 553 | walk->stride = crypto_aead_chunksize(tfm); |
b286d8b1 HX |
554 | walk->ivsize = crypto_aead_ivsize(tfm); |
555 | walk->alignmask = crypto_aead_alignmask(tfm); | |
556 | ||
557 | err = skcipher_walk_first(walk); | |
558 | ||
559 | if (atomic) | |
560 | walk->flags &= ~SKCIPHER_WALK_SLEEP; | |
561 | ||
562 | return err; | |
563 | } | |
34bc085c | 564 | |
34bc085c HX |
565 | int skcipher_walk_aead_encrypt(struct skcipher_walk *walk, |
566 | struct aead_request *req, bool atomic) | |
567 | { | |
568 | walk->total = req->cryptlen; | |
569 | ||
570 | return skcipher_walk_aead_common(walk, req, atomic); | |
571 | } | |
572 | EXPORT_SYMBOL_GPL(skcipher_walk_aead_encrypt); | |
573 | ||
574 | int skcipher_walk_aead_decrypt(struct skcipher_walk *walk, | |
575 | struct aead_request *req, bool atomic) | |
576 | { | |
577 | struct crypto_aead *tfm = crypto_aead_reqtfm(req); | |
578 | ||
579 | walk->total = req->cryptlen - crypto_aead_authsize(tfm); | |
580 | ||
581 | return skcipher_walk_aead_common(walk, req, atomic); | |
582 | } | |
583 | EXPORT_SYMBOL_GPL(skcipher_walk_aead_decrypt); | |
584 | ||
b1f6b4bf EB |
585 | static void skcipher_set_needkey(struct crypto_skcipher *tfm) |
586 | { | |
9ac0d136 | 587 | if (crypto_skcipher_max_keysize(tfm) != 0) |
b1f6b4bf EB |
588 | crypto_skcipher_set_flags(tfm, CRYPTO_TFM_NEED_KEY); |
589 | } | |
590 | ||
9933e113 HX |
591 | static int skcipher_setkey_unaligned(struct crypto_skcipher *tfm, |
592 | const u8 *key, unsigned int keylen) | |
593 | { | |
594 | unsigned long alignmask = crypto_skcipher_alignmask(tfm); | |
595 | struct skcipher_alg *cipher = crypto_skcipher_alg(tfm); | |
596 | u8 *buffer, *alignbuffer; | |
597 | unsigned long absize; | |
598 | int ret; | |
599 | ||
600 | absize = keylen + alignmask; | |
601 | buffer = kmalloc(absize, GFP_ATOMIC); | |
602 | if (!buffer) | |
603 | return -ENOMEM; | |
604 | ||
605 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
606 | memcpy(alignbuffer, key, keylen); | |
607 | ret = cipher->setkey(tfm, alignbuffer, keylen); | |
453431a5 | 608 | kfree_sensitive(buffer); |
9933e113 HX |
609 | return ret; |
610 | } | |
611 | ||
15252d94 | 612 | int crypto_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key, |
9933e113 HX |
613 | unsigned int keylen) |
614 | { | |
615 | struct skcipher_alg *cipher = crypto_skcipher_alg(tfm); | |
616 | unsigned long alignmask = crypto_skcipher_alignmask(tfm); | |
f8d33fac | 617 | int err; |
9933e113 | 618 | |
674f368a | 619 | if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) |
9933e113 | 620 | return -EINVAL; |
9933e113 HX |
621 | |
622 | if ((unsigned long)key & alignmask) | |
f8d33fac EB |
623 | err = skcipher_setkey_unaligned(tfm, key, keylen); |
624 | else | |
625 | err = cipher->setkey(tfm, key, keylen); | |
626 | ||
b1f6b4bf EB |
627 | if (unlikely(err)) { |
628 | skcipher_set_needkey(tfm); | |
f8d33fac | 629 | return err; |
b1f6b4bf | 630 | } |
9933e113 | 631 | |
f8d33fac EB |
632 | crypto_skcipher_clear_flags(tfm, CRYPTO_TFM_NEED_KEY); |
633 | return 0; | |
9933e113 | 634 | } |
15252d94 | 635 | EXPORT_SYMBOL_GPL(crypto_skcipher_setkey); |
9933e113 | 636 | |
81bcbb1e EB |
637 | int crypto_skcipher_encrypt(struct skcipher_request *req) |
638 | { | |
639 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
1085680b | 640 | struct skcipher_alg *alg = crypto_skcipher_alg(tfm); |
81bcbb1e EB |
641 | int ret; |
642 | ||
1085680b HX |
643 | if (IS_ENABLED(CONFIG_CRYPTO_STATS)) { |
644 | struct crypto_istat_cipher *istat = skcipher_get_stat(alg); | |
645 | ||
646 | atomic64_inc(&istat->encrypt_cnt); | |
647 | atomic64_add(req->cryptlen, &istat->encrypt_tlen); | |
648 | } | |
649 | ||
81bcbb1e EB |
650 | if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) |
651 | ret = -ENOKEY; | |
652 | else | |
1085680b HX |
653 | ret = alg->encrypt(req); |
654 | ||
655 | return crypto_skcipher_errstat(alg, ret); | |
81bcbb1e EB |
656 | } |
657 | EXPORT_SYMBOL_GPL(crypto_skcipher_encrypt); | |
658 | ||
659 | int crypto_skcipher_decrypt(struct skcipher_request *req) | |
660 | { | |
661 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); | |
1085680b | 662 | struct skcipher_alg *alg = crypto_skcipher_alg(tfm); |
81bcbb1e EB |
663 | int ret; |
664 | ||
1085680b HX |
665 | if (IS_ENABLED(CONFIG_CRYPTO_STATS)) { |
666 | struct crypto_istat_cipher *istat = skcipher_get_stat(alg); | |
667 | ||
668 | atomic64_inc(&istat->decrypt_cnt); | |
669 | atomic64_add(req->cryptlen, &istat->decrypt_tlen); | |
670 | } | |
671 | ||
81bcbb1e EB |
672 | if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) |
673 | ret = -ENOKEY; | |
674 | else | |
1085680b HX |
675 | ret = alg->decrypt(req); |
676 | ||
677 | return crypto_skcipher_errstat(alg, ret); | |
81bcbb1e EB |
678 | } |
679 | EXPORT_SYMBOL_GPL(crypto_skcipher_decrypt); | |
680 | ||
4e6c3df4 HX |
681 | static void crypto_skcipher_exit_tfm(struct crypto_tfm *tfm) |
682 | { | |
683 | struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm); | |
684 | struct skcipher_alg *alg = crypto_skcipher_alg(skcipher); | |
685 | ||
686 | alg->exit(skcipher); | |
687 | } | |
688 | ||
7a7ffe65 HX |
689 | static int crypto_skcipher_init_tfm(struct crypto_tfm *tfm) |
690 | { | |
4e6c3df4 HX |
691 | struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm); |
692 | struct skcipher_alg *alg = crypto_skcipher_alg(skcipher); | |
693 | ||
b1f6b4bf | 694 | skcipher_set_needkey(skcipher); |
f8d33fac | 695 | |
4e6c3df4 HX |
696 | if (alg->exit) |
697 | skcipher->base.exit = crypto_skcipher_exit_tfm; | |
7a7ffe65 | 698 | |
4e6c3df4 HX |
699 | if (alg->init) |
700 | return alg->init(skcipher); | |
701 | ||
702 | return 0; | |
703 | } | |
704 | ||
705 | static void crypto_skcipher_free_instance(struct crypto_instance *inst) | |
706 | { | |
707 | struct skcipher_instance *skcipher = | |
708 | container_of(inst, struct skcipher_instance, s.base); | |
709 | ||
710 | skcipher->free(skcipher); | |
711 | } | |
712 | ||
713 | static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg) | |
d8c34b94 | 714 | __maybe_unused; |
4e6c3df4 HX |
715 | static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg) |
716 | { | |
1085680b | 717 | struct skcipher_alg *skcipher = __crypto_skcipher_alg(alg); |
4e6c3df4 HX |
718 | |
719 | seq_printf(m, "type : skcipher\n"); | |
720 | seq_printf(m, "async : %s\n", | |
721 | alg->cra_flags & CRYPTO_ALG_ASYNC ? "yes" : "no"); | |
722 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
723 | seq_printf(m, "min keysize : %u\n", skcipher->min_keysize); | |
724 | seq_printf(m, "max keysize : %u\n", skcipher->max_keysize); | |
725 | seq_printf(m, "ivsize : %u\n", skcipher->ivsize); | |
726 | seq_printf(m, "chunksize : %u\n", skcipher->chunksize); | |
c821f6ab | 727 | seq_printf(m, "walksize : %u\n", skcipher->walksize); |
7a7ffe65 HX |
728 | } |
729 | ||
c0f9e01d HX |
730 | static int __maybe_unused crypto_skcipher_report( |
731 | struct sk_buff *skb, struct crypto_alg *alg) | |
4e6c3df4 | 732 | { |
1085680b | 733 | struct skcipher_alg *skcipher = __crypto_skcipher_alg(alg); |
4e6c3df4 | 734 | struct crypto_report_blkcipher rblkcipher; |
4e6c3df4 | 735 | |
37db69e0 EB |
736 | memset(&rblkcipher, 0, sizeof(rblkcipher)); |
737 | ||
738 | strscpy(rblkcipher.type, "skcipher", sizeof(rblkcipher.type)); | |
739 | strscpy(rblkcipher.geniv, "<none>", sizeof(rblkcipher.geniv)); | |
4e6c3df4 HX |
740 | |
741 | rblkcipher.blocksize = alg->cra_blocksize; | |
742 | rblkcipher.min_keysize = skcipher->min_keysize; | |
743 | rblkcipher.max_keysize = skcipher->max_keysize; | |
744 | rblkcipher.ivsize = skcipher->ivsize; | |
745 | ||
37db69e0 EB |
746 | return nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER, |
747 | sizeof(rblkcipher), &rblkcipher); | |
4e6c3df4 | 748 | } |
4e6c3df4 | 749 | |
1085680b HX |
750 | static int __maybe_unused crypto_skcipher_report_stat( |
751 | struct sk_buff *skb, struct crypto_alg *alg) | |
752 | { | |
753 | struct skcipher_alg *skcipher = __crypto_skcipher_alg(alg); | |
754 | struct crypto_istat_cipher *istat; | |
755 | struct crypto_stat_cipher rcipher; | |
756 | ||
757 | istat = skcipher_get_stat(skcipher); | |
758 | ||
759 | memset(&rcipher, 0, sizeof(rcipher)); | |
760 | ||
761 | strscpy(rcipher.type, "cipher", sizeof(rcipher.type)); | |
762 | ||
763 | rcipher.stat_encrypt_cnt = atomic64_read(&istat->encrypt_cnt); | |
764 | rcipher.stat_encrypt_tlen = atomic64_read(&istat->encrypt_tlen); | |
765 | rcipher.stat_decrypt_cnt = atomic64_read(&istat->decrypt_cnt); | |
766 | rcipher.stat_decrypt_tlen = atomic64_read(&istat->decrypt_tlen); | |
767 | rcipher.stat_err_cnt = atomic64_read(&istat->err_cnt); | |
768 | ||
769 | return nla_put(skb, CRYPTOCFGA_STAT_CIPHER, sizeof(rcipher), &rcipher); | |
770 | } | |
771 | ||
53253064 | 772 | static const struct crypto_type crypto_skcipher_type = { |
89873b44 | 773 | .extsize = crypto_alg_extsize, |
7a7ffe65 | 774 | .init_tfm = crypto_skcipher_init_tfm, |
4e6c3df4 HX |
775 | .free = crypto_skcipher_free_instance, |
776 | #ifdef CONFIG_PROC_FS | |
777 | .show = crypto_skcipher_show, | |
778 | #endif | |
b8969a1b | 779 | #if IS_ENABLED(CONFIG_CRYPTO_USER) |
4e6c3df4 | 780 | .report = crypto_skcipher_report, |
c0f9e01d | 781 | #endif |
1085680b HX |
782 | #ifdef CONFIG_CRYPTO_STATS |
783 | .report_stat = crypto_skcipher_report_stat, | |
784 | #endif | |
7a7ffe65 | 785 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, |
c65058b7 | 786 | .maskset = CRYPTO_ALG_TYPE_MASK, |
4e6c3df4 | 787 | .type = CRYPTO_ALG_TYPE_SKCIPHER, |
7a7ffe65 HX |
788 | .tfmsize = offsetof(struct crypto_skcipher, base), |
789 | }; | |
790 | ||
3a01d0ee | 791 | int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, |
b9f76ddd EB |
792 | struct crypto_instance *inst, |
793 | const char *name, u32 type, u32 mask) | |
4e6c3df4 | 794 | { |
53253064 | 795 | spawn->base.frontend = &crypto_skcipher_type; |
de95c957 | 796 | return crypto_grab_spawn(&spawn->base, inst, name, type, mask); |
4e6c3df4 | 797 | } |
3a01d0ee | 798 | EXPORT_SYMBOL_GPL(crypto_grab_skcipher); |
4e6c3df4 | 799 | |
7a7ffe65 HX |
800 | struct crypto_skcipher *crypto_alloc_skcipher(const char *alg_name, |
801 | u32 type, u32 mask) | |
802 | { | |
53253064 | 803 | return crypto_alloc_tfm(alg_name, &crypto_skcipher_type, type, mask); |
7a7ffe65 HX |
804 | } |
805 | EXPORT_SYMBOL_GPL(crypto_alloc_skcipher); | |
806 | ||
b350bee5 KC |
807 | struct crypto_sync_skcipher *crypto_alloc_sync_skcipher( |
808 | const char *alg_name, u32 type, u32 mask) | |
809 | { | |
810 | struct crypto_skcipher *tfm; | |
811 | ||
812 | /* Only sync algorithms allowed. */ | |
e6cb02bd | 813 | mask |= CRYPTO_ALG_ASYNC | CRYPTO_ALG_SKCIPHER_REQSIZE_LARGE; |
b350bee5 | 814 | |
53253064 | 815 | tfm = crypto_alloc_tfm(alg_name, &crypto_skcipher_type, type, mask); |
b350bee5 KC |
816 | |
817 | /* | |
818 | * Make sure we do not allocate something that might get used with | |
819 | * an on-stack request: check the request size. | |
820 | */ | |
821 | if (!IS_ERR(tfm) && WARN_ON(crypto_skcipher_reqsize(tfm) > | |
822 | MAX_SYNC_SKCIPHER_REQSIZE)) { | |
823 | crypto_free_skcipher(tfm); | |
824 | return ERR_PTR(-EINVAL); | |
825 | } | |
826 | ||
827 | return (struct crypto_sync_skcipher *)tfm; | |
828 | } | |
829 | EXPORT_SYMBOL_GPL(crypto_alloc_sync_skcipher); | |
830 | ||
d3ca75a8 | 831 | int crypto_has_skcipher(const char *alg_name, u32 type, u32 mask) |
4e6c3df4 | 832 | { |
53253064 | 833 | return crypto_type_has_alg(alg_name, &crypto_skcipher_type, type, mask); |
4e6c3df4 | 834 | } |
d3ca75a8 | 835 | EXPORT_SYMBOL_GPL(crypto_has_skcipher); |
4e6c3df4 HX |
836 | |
837 | static int skcipher_prepare_alg(struct skcipher_alg *alg) | |
838 | { | |
1085680b | 839 | struct crypto_istat_cipher *istat = skcipher_get_stat(alg); |
4e6c3df4 HX |
840 | struct crypto_alg *base = &alg->base; |
841 | ||
c821f6ab AB |
842 | if (alg->ivsize > PAGE_SIZE / 8 || alg->chunksize > PAGE_SIZE / 8 || |
843 | alg->walksize > PAGE_SIZE / 8) | |
4e6c3df4 HX |
844 | return -EINVAL; |
845 | ||
846 | if (!alg->chunksize) | |
847 | alg->chunksize = base->cra_blocksize; | |
c821f6ab AB |
848 | if (!alg->walksize) |
849 | alg->walksize = alg->chunksize; | |
4e6c3df4 | 850 | |
53253064 | 851 | base->cra_type = &crypto_skcipher_type; |
4e6c3df4 HX |
852 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; |
853 | base->cra_flags |= CRYPTO_ALG_TYPE_SKCIPHER; | |
854 | ||
1085680b HX |
855 | if (IS_ENABLED(CONFIG_CRYPTO_STATS)) |
856 | memset(istat, 0, sizeof(*istat)); | |
857 | ||
4e6c3df4 HX |
858 | return 0; |
859 | } | |
860 | ||
861 | int crypto_register_skcipher(struct skcipher_alg *alg) | |
862 | { | |
863 | struct crypto_alg *base = &alg->base; | |
864 | int err; | |
865 | ||
866 | err = skcipher_prepare_alg(alg); | |
867 | if (err) | |
868 | return err; | |
869 | ||
870 | return crypto_register_alg(base); | |
871 | } | |
872 | EXPORT_SYMBOL_GPL(crypto_register_skcipher); | |
873 | ||
874 | void crypto_unregister_skcipher(struct skcipher_alg *alg) | |
875 | { | |
876 | crypto_unregister_alg(&alg->base); | |
877 | } | |
878 | EXPORT_SYMBOL_GPL(crypto_unregister_skcipher); | |
879 | ||
880 | int crypto_register_skciphers(struct skcipher_alg *algs, int count) | |
881 | { | |
882 | int i, ret; | |
883 | ||
884 | for (i = 0; i < count; i++) { | |
885 | ret = crypto_register_skcipher(&algs[i]); | |
886 | if (ret) | |
887 | goto err; | |
888 | } | |
889 | ||
890 | return 0; | |
891 | ||
892 | err: | |
893 | for (--i; i >= 0; --i) | |
894 | crypto_unregister_skcipher(&algs[i]); | |
895 | ||
896 | return ret; | |
897 | } | |
898 | EXPORT_SYMBOL_GPL(crypto_register_skciphers); | |
899 | ||
900 | void crypto_unregister_skciphers(struct skcipher_alg *algs, int count) | |
901 | { | |
902 | int i; | |
903 | ||
904 | for (i = count - 1; i >= 0; --i) | |
905 | crypto_unregister_skcipher(&algs[i]); | |
906 | } | |
907 | EXPORT_SYMBOL_GPL(crypto_unregister_skciphers); | |
908 | ||
909 | int skcipher_register_instance(struct crypto_template *tmpl, | |
910 | struct skcipher_instance *inst) | |
911 | { | |
912 | int err; | |
913 | ||
d4fdc2df EB |
914 | if (WARN_ON(!inst->free)) |
915 | return -EINVAL; | |
916 | ||
4e6c3df4 HX |
917 | err = skcipher_prepare_alg(&inst->alg); |
918 | if (err) | |
919 | return err; | |
920 | ||
921 | return crypto_register_instance(tmpl, skcipher_crypto_instance(inst)); | |
922 | } | |
923 | EXPORT_SYMBOL_GPL(skcipher_register_instance); | |
924 | ||
0872da16 EB |
925 | static int skcipher_setkey_simple(struct crypto_skcipher *tfm, const u8 *key, |
926 | unsigned int keylen) | |
927 | { | |
928 | struct crypto_cipher *cipher = skcipher_cipher_simple(tfm); | |
0872da16 EB |
929 | |
930 | crypto_cipher_clear_flags(cipher, CRYPTO_TFM_REQ_MASK); | |
931 | crypto_cipher_set_flags(cipher, crypto_skcipher_get_flags(tfm) & | |
932 | CRYPTO_TFM_REQ_MASK); | |
af5034e8 | 933 | return crypto_cipher_setkey(cipher, key, keylen); |
0872da16 EB |
934 | } |
935 | ||
936 | static int skcipher_init_tfm_simple(struct crypto_skcipher *tfm) | |
937 | { | |
938 | struct skcipher_instance *inst = skcipher_alg_instance(tfm); | |
d5ed3b65 | 939 | struct crypto_cipher_spawn *spawn = skcipher_instance_ctx(inst); |
0872da16 EB |
940 | struct skcipher_ctx_simple *ctx = crypto_skcipher_ctx(tfm); |
941 | struct crypto_cipher *cipher; | |
942 | ||
943 | cipher = crypto_spawn_cipher(spawn); | |
944 | if (IS_ERR(cipher)) | |
945 | return PTR_ERR(cipher); | |
946 | ||
947 | ctx->cipher = cipher; | |
948 | return 0; | |
949 | } | |
950 | ||
951 | static void skcipher_exit_tfm_simple(struct crypto_skcipher *tfm) | |
952 | { | |
953 | struct skcipher_ctx_simple *ctx = crypto_skcipher_ctx(tfm); | |
954 | ||
955 | crypto_free_cipher(ctx->cipher); | |
956 | } | |
957 | ||
958 | static void skcipher_free_instance_simple(struct skcipher_instance *inst) | |
959 | { | |
aacd5b4c | 960 | crypto_drop_cipher(skcipher_instance_ctx(inst)); |
0872da16 EB |
961 | kfree(inst); |
962 | } | |
963 | ||
964 | /** | |
965 | * skcipher_alloc_instance_simple - allocate instance of simple block cipher mode | |
966 | * | |
967 | * Allocate an skcipher_instance for a simple block cipher mode of operation, | |
968 | * e.g. cbc or ecb. The instance context will have just a single crypto_spawn, | |
969 | * that for the underlying cipher. The {min,max}_keysize, ivsize, blocksize, | |
970 | * alignmask, and priority are set from the underlying cipher but can be | |
971 | * overridden if needed. The tfm context defaults to skcipher_ctx_simple, and | |
972 | * default ->setkey(), ->init(), and ->exit() methods are installed. | |
973 | * | |
974 | * @tmpl: the template being instantiated | |
975 | * @tb: the template parameters | |
0872da16 EB |
976 | * |
977 | * Return: a pointer to the new instance, or an ERR_PTR(). The caller still | |
978 | * needs to register the instance. | |
979 | */ | |
b3c16bfc HX |
980 | struct skcipher_instance *skcipher_alloc_instance_simple( |
981 | struct crypto_template *tmpl, struct rtattr **tb) | |
0872da16 | 982 | { |
0872da16 | 983 | u32 mask; |
aacd5b4c EB |
984 | struct skcipher_instance *inst; |
985 | struct crypto_cipher_spawn *spawn; | |
986 | struct crypto_alg *cipher_alg; | |
0872da16 EB |
987 | int err; |
988 | ||
7bcb2c99 EB |
989 | err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SKCIPHER, &mask); |
990 | if (err) | |
991 | return ERR_PTR(err); | |
0872da16 EB |
992 | |
993 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); | |
aacd5b4c EB |
994 | if (!inst) |
995 | return ERR_PTR(-ENOMEM); | |
0872da16 EB |
996 | spawn = skcipher_instance_ctx(inst); |
997 | ||
aacd5b4c EB |
998 | err = crypto_grab_cipher(spawn, skcipher_crypto_instance(inst), |
999 | crypto_attr_alg_name(tb[1]), 0, mask); | |
0872da16 EB |
1000 | if (err) |
1001 | goto err_free_inst; | |
aacd5b4c | 1002 | cipher_alg = crypto_spawn_cipher_alg(spawn); |
0872da16 | 1003 | |
aacd5b4c EB |
1004 | err = crypto_inst_setname(skcipher_crypto_instance(inst), tmpl->name, |
1005 | cipher_alg); | |
0872da16 EB |
1006 | if (err) |
1007 | goto err_free_inst; | |
aacd5b4c | 1008 | |
0872da16 EB |
1009 | inst->free = skcipher_free_instance_simple; |
1010 | ||
1011 | /* Default algorithm properties, can be overridden */ | |
1012 | inst->alg.base.cra_blocksize = cipher_alg->cra_blocksize; | |
1013 | inst->alg.base.cra_alignmask = cipher_alg->cra_alignmask; | |
1014 | inst->alg.base.cra_priority = cipher_alg->cra_priority; | |
1015 | inst->alg.min_keysize = cipher_alg->cra_cipher.cia_min_keysize; | |
1016 | inst->alg.max_keysize = cipher_alg->cra_cipher.cia_max_keysize; | |
1017 | inst->alg.ivsize = cipher_alg->cra_blocksize; | |
1018 | ||
1019 | /* Use skcipher_ctx_simple by default, can be overridden */ | |
1020 | inst->alg.base.cra_ctxsize = sizeof(struct skcipher_ctx_simple); | |
1021 | inst->alg.setkey = skcipher_setkey_simple; | |
1022 | inst->alg.init = skcipher_init_tfm_simple; | |
1023 | inst->alg.exit = skcipher_exit_tfm_simple; | |
1024 | ||
0872da16 EB |
1025 | return inst; |
1026 | ||
1027 | err_free_inst: | |
aacd5b4c | 1028 | skcipher_free_instance_simple(inst); |
0872da16 EB |
1029 | return ERR_PTR(err); |
1030 | } | |
1031 | EXPORT_SYMBOL_GPL(skcipher_alloc_instance_simple); | |
1032 | ||
7a7ffe65 HX |
1033 | MODULE_LICENSE("GPL"); |
1034 | MODULE_DESCRIPTION("Symmetric key cipher type"); | |
0eb76ba2 | 1035 | MODULE_IMPORT_NS(CRYPTO_INTERNAL); |