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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
5cde0af2 HX |
2 | /* |
3 | * Block chaining cipher operations. | |
d8c34b94 | 4 | * |
5cde0af2 HX |
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) 2006 Herbert Xu <herbert@gondor.apana.org.au> | |
5cde0af2 HX |
10 | */ |
11 | ||
d1a2fd50 | 12 | #include <crypto/aead.h> |
ecfc4329 | 13 | #include <crypto/internal/skcipher.h> |
42c271c6 | 14 | #include <crypto/scatterwalk.h> |
5cde0af2 HX |
15 | #include <linux/errno.h> |
16 | #include <linux/kernel.h> | |
5cde0af2 | 17 | #include <linux/module.h> |
5cde0af2 HX |
18 | #include <linux/seq_file.h> |
19 | #include <linux/slab.h> | |
20 | #include <linux/string.h> | |
50496a1f | 21 | #include <linux/cryptouser.h> |
d8c34b94 | 22 | #include <linux/compiler.h> |
50496a1f | 23 | #include <net/netlink.h> |
5cde0af2 HX |
24 | |
25 | #include "internal.h" | |
5cde0af2 HX |
26 | |
27 | enum { | |
28 | BLKCIPHER_WALK_PHYS = 1 << 0, | |
29 | BLKCIPHER_WALK_SLOW = 1 << 1, | |
30 | BLKCIPHER_WALK_COPY = 1 << 2, | |
31 | BLKCIPHER_WALK_DIFF = 1 << 3, | |
32 | }; | |
33 | ||
34 | static int blkcipher_walk_next(struct blkcipher_desc *desc, | |
35 | struct blkcipher_walk *walk); | |
36 | static int blkcipher_walk_first(struct blkcipher_desc *desc, | |
37 | struct blkcipher_walk *walk); | |
38 | ||
39 | static inline void blkcipher_map_src(struct blkcipher_walk *walk) | |
40 | { | |
f0dfc0b0 | 41 | walk->src.virt.addr = scatterwalk_map(&walk->in); |
5cde0af2 HX |
42 | } |
43 | ||
44 | static inline void blkcipher_map_dst(struct blkcipher_walk *walk) | |
45 | { | |
f0dfc0b0 | 46 | walk->dst.virt.addr = scatterwalk_map(&walk->out); |
5cde0af2 HX |
47 | } |
48 | ||
49 | static inline void blkcipher_unmap_src(struct blkcipher_walk *walk) | |
50 | { | |
f0dfc0b0 | 51 | scatterwalk_unmap(walk->src.virt.addr); |
5cde0af2 HX |
52 | } |
53 | ||
54 | static inline void blkcipher_unmap_dst(struct blkcipher_walk *walk) | |
55 | { | |
f0dfc0b0 | 56 | scatterwalk_unmap(walk->dst.virt.addr); |
5cde0af2 HX |
57 | } |
58 | ||
e4630f9f HX |
59 | /* Get a spot of the specified length that does not straddle a page. |
60 | * The caller needs to ensure that there is enough space for this operation. | |
61 | */ | |
5cde0af2 HX |
62 | static inline u8 *blkcipher_get_spot(u8 *start, unsigned int len) |
63 | { | |
e4630f9f | 64 | u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK); |
5aaff0c8 | 65 | return max(start, end_page); |
5cde0af2 HX |
66 | } |
67 | ||
0868def3 EB |
68 | static inline void blkcipher_done_slow(struct blkcipher_walk *walk, |
69 | unsigned int bsize) | |
5cde0af2 HX |
70 | { |
71 | u8 *addr; | |
5cde0af2 | 72 | |
822be00f | 73 | addr = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1); |
5cde0af2 HX |
74 | addr = blkcipher_get_spot(addr, bsize); |
75 | scatterwalk_copychunks(addr, &walk->out, bsize, 1); | |
5cde0af2 HX |
76 | } |
77 | ||
0868def3 EB |
78 | static inline void blkcipher_done_fast(struct blkcipher_walk *walk, |
79 | unsigned int n) | |
5cde0af2 | 80 | { |
5cde0af2 HX |
81 | if (walk->flags & BLKCIPHER_WALK_COPY) { |
82 | blkcipher_map_dst(walk); | |
83 | memcpy(walk->dst.virt.addr, walk->page, n); | |
84 | blkcipher_unmap_dst(walk); | |
85 | } else if (!(walk->flags & BLKCIPHER_WALK_PHYS)) { | |
5cde0af2 HX |
86 | if (walk->flags & BLKCIPHER_WALK_DIFF) |
87 | blkcipher_unmap_dst(walk); | |
61ecdb80 | 88 | blkcipher_unmap_src(walk); |
5cde0af2 HX |
89 | } |
90 | ||
91 | scatterwalk_advance(&walk->in, n); | |
92 | scatterwalk_advance(&walk->out, n); | |
5cde0af2 HX |
93 | } |
94 | ||
95 | int blkcipher_walk_done(struct blkcipher_desc *desc, | |
96 | struct blkcipher_walk *walk, int err) | |
97 | { | |
0868def3 EB |
98 | unsigned int n; /* bytes processed */ |
99 | bool more; | |
5cde0af2 | 100 | |
0868def3 EB |
101 | if (unlikely(err < 0)) |
102 | goto finish; | |
5cde0af2 | 103 | |
0868def3 EB |
104 | n = walk->nbytes - err; |
105 | walk->total -= n; | |
106 | more = (walk->total != 0); | |
5cde0af2 | 107 | |
0868def3 EB |
108 | if (likely(!(walk->flags & BLKCIPHER_WALK_SLOW))) { |
109 | blkcipher_done_fast(walk, n); | |
110 | } else { | |
111 | if (WARN_ON(err)) { | |
112 | /* unexpected case; didn't process all bytes */ | |
113 | err = -EINVAL; | |
114 | goto finish; | |
115 | } | |
116 | blkcipher_done_slow(walk, n); | |
5cde0af2 HX |
117 | } |
118 | ||
0868def3 EB |
119 | scatterwalk_done(&walk->in, 0, more); |
120 | scatterwalk_done(&walk->out, 1, more); | |
5cde0af2 | 121 | |
0868def3 | 122 | if (more) { |
5cde0af2 HX |
123 | crypto_yield(desc->flags); |
124 | return blkcipher_walk_next(desc, walk); | |
125 | } | |
0868def3 EB |
126 | err = 0; |
127 | finish: | |
128 | walk->nbytes = 0; | |
5cde0af2 | 129 | if (walk->iv != desc->info) |
822be00f | 130 | memcpy(desc->info, walk->iv, walk->ivsize); |
5cde0af2 HX |
131 | if (walk->buffer != walk->page) |
132 | kfree(walk->buffer); | |
133 | if (walk->page) | |
134 | free_page((unsigned long)walk->page); | |
5cde0af2 HX |
135 | return err; |
136 | } | |
137 | EXPORT_SYMBOL_GPL(blkcipher_walk_done); | |
138 | ||
139 | static inline int blkcipher_next_slow(struct blkcipher_desc *desc, | |
140 | struct blkcipher_walk *walk, | |
141 | unsigned int bsize, | |
142 | unsigned int alignmask) | |
143 | { | |
144 | unsigned int n; | |
70613783 | 145 | unsigned aligned_bsize = ALIGN(bsize, alignmask + 1); |
5cde0af2 HX |
146 | |
147 | if (walk->buffer) | |
148 | goto ok; | |
149 | ||
150 | walk->buffer = walk->page; | |
151 | if (walk->buffer) | |
152 | goto ok; | |
153 | ||
2614de1b | 154 | n = aligned_bsize * 3 - (alignmask + 1) + |
e4630f9f | 155 | (alignmask & ~(crypto_tfm_ctx_alignment() - 1)); |
5cde0af2 HX |
156 | walk->buffer = kmalloc(n, GFP_ATOMIC); |
157 | if (!walk->buffer) | |
158 | return blkcipher_walk_done(desc, walk, -ENOMEM); | |
159 | ||
160 | ok: | |
161 | walk->dst.virt.addr = (u8 *)ALIGN((unsigned long)walk->buffer, | |
162 | alignmask + 1); | |
163 | walk->dst.virt.addr = blkcipher_get_spot(walk->dst.virt.addr, bsize); | |
70613783 HX |
164 | walk->src.virt.addr = blkcipher_get_spot(walk->dst.virt.addr + |
165 | aligned_bsize, bsize); | |
5cde0af2 HX |
166 | |
167 | scatterwalk_copychunks(walk->src.virt.addr, &walk->in, bsize, 0); | |
168 | ||
169 | walk->nbytes = bsize; | |
170 | walk->flags |= BLKCIPHER_WALK_SLOW; | |
171 | ||
172 | return 0; | |
173 | } | |
174 | ||
175 | static inline int blkcipher_next_copy(struct blkcipher_walk *walk) | |
176 | { | |
177 | u8 *tmp = walk->page; | |
178 | ||
179 | blkcipher_map_src(walk); | |
180 | memcpy(tmp, walk->src.virt.addr, walk->nbytes); | |
181 | blkcipher_unmap_src(walk); | |
182 | ||
183 | walk->src.virt.addr = tmp; | |
184 | walk->dst.virt.addr = tmp; | |
185 | ||
186 | return 0; | |
187 | } | |
188 | ||
189 | static inline int blkcipher_next_fast(struct blkcipher_desc *desc, | |
190 | struct blkcipher_walk *walk) | |
191 | { | |
192 | unsigned long diff; | |
193 | ||
194 | walk->src.phys.page = scatterwalk_page(&walk->in); | |
195 | walk->src.phys.offset = offset_in_page(walk->in.offset); | |
196 | walk->dst.phys.page = scatterwalk_page(&walk->out); | |
197 | walk->dst.phys.offset = offset_in_page(walk->out.offset); | |
198 | ||
199 | if (walk->flags & BLKCIPHER_WALK_PHYS) | |
200 | return 0; | |
201 | ||
202 | diff = walk->src.phys.offset - walk->dst.phys.offset; | |
203 | diff |= walk->src.virt.page - walk->dst.virt.page; | |
204 | ||
205 | blkcipher_map_src(walk); | |
206 | walk->dst.virt.addr = walk->src.virt.addr; | |
207 | ||
208 | if (diff) { | |
209 | walk->flags |= BLKCIPHER_WALK_DIFF; | |
210 | blkcipher_map_dst(walk); | |
211 | } | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
216 | static int blkcipher_walk_next(struct blkcipher_desc *desc, | |
217 | struct blkcipher_walk *walk) | |
218 | { | |
7607bd8f | 219 | unsigned int bsize; |
5cde0af2 HX |
220 | unsigned int n; |
221 | int err; | |
222 | ||
223 | n = walk->total; | |
822be00f | 224 | if (unlikely(n < walk->cipher_blocksize)) { |
5cde0af2 HX |
225 | desc->flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN; |
226 | return blkcipher_walk_done(desc, walk, -EINVAL); | |
227 | } | |
228 | ||
acdb04d0 HX |
229 | bsize = min(walk->walk_blocksize, n); |
230 | ||
5cde0af2 HX |
231 | walk->flags &= ~(BLKCIPHER_WALK_SLOW | BLKCIPHER_WALK_COPY | |
232 | BLKCIPHER_WALK_DIFF); | |
822be00f AB |
233 | if (!scatterwalk_aligned(&walk->in, walk->alignmask) || |
234 | !scatterwalk_aligned(&walk->out, walk->alignmask)) { | |
5cde0af2 HX |
235 | walk->flags |= BLKCIPHER_WALK_COPY; |
236 | if (!walk->page) { | |
237 | walk->page = (void *)__get_free_page(GFP_ATOMIC); | |
238 | if (!walk->page) | |
239 | n = 0; | |
240 | } | |
241 | } | |
242 | ||
243 | n = scatterwalk_clamp(&walk->in, n); | |
244 | n = scatterwalk_clamp(&walk->out, n); | |
245 | ||
246 | if (unlikely(n < bsize)) { | |
822be00f | 247 | err = blkcipher_next_slow(desc, walk, bsize, walk->alignmask); |
5cde0af2 HX |
248 | goto set_phys_lowmem; |
249 | } | |
250 | ||
251 | walk->nbytes = n; | |
252 | if (walk->flags & BLKCIPHER_WALK_COPY) { | |
253 | err = blkcipher_next_copy(walk); | |
254 | goto set_phys_lowmem; | |
255 | } | |
256 | ||
257 | return blkcipher_next_fast(desc, walk); | |
258 | ||
259 | set_phys_lowmem: | |
260 | if (walk->flags & BLKCIPHER_WALK_PHYS) { | |
261 | walk->src.phys.page = virt_to_page(walk->src.virt.addr); | |
262 | walk->dst.phys.page = virt_to_page(walk->dst.virt.addr); | |
263 | walk->src.phys.offset &= PAGE_SIZE - 1; | |
264 | walk->dst.phys.offset &= PAGE_SIZE - 1; | |
265 | } | |
266 | return err; | |
267 | } | |
268 | ||
822be00f | 269 | static inline int blkcipher_copy_iv(struct blkcipher_walk *walk) |
5cde0af2 | 270 | { |
822be00f AB |
271 | unsigned bs = walk->walk_blocksize; |
272 | unsigned aligned_bs = ALIGN(bs, walk->alignmask + 1); | |
273 | unsigned int size = aligned_bs * 2 + | |
274 | walk->ivsize + max(aligned_bs, walk->ivsize) - | |
275 | (walk->alignmask + 1); | |
5cde0af2 HX |
276 | u8 *iv; |
277 | ||
822be00f | 278 | size += walk->alignmask & ~(crypto_tfm_ctx_alignment() - 1); |
5cde0af2 HX |
279 | walk->buffer = kmalloc(size, GFP_ATOMIC); |
280 | if (!walk->buffer) | |
281 | return -ENOMEM; | |
282 | ||
822be00f | 283 | iv = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1); |
70613783 HX |
284 | iv = blkcipher_get_spot(iv, bs) + aligned_bs; |
285 | iv = blkcipher_get_spot(iv, bs) + aligned_bs; | |
822be00f | 286 | iv = blkcipher_get_spot(iv, walk->ivsize); |
5cde0af2 | 287 | |
822be00f | 288 | walk->iv = memcpy(iv, walk->iv, walk->ivsize); |
5cde0af2 HX |
289 | return 0; |
290 | } | |
291 | ||
292 | int blkcipher_walk_virt(struct blkcipher_desc *desc, | |
293 | struct blkcipher_walk *walk) | |
294 | { | |
295 | walk->flags &= ~BLKCIPHER_WALK_PHYS; | |
822be00f AB |
296 | walk->walk_blocksize = crypto_blkcipher_blocksize(desc->tfm); |
297 | walk->cipher_blocksize = walk->walk_blocksize; | |
298 | walk->ivsize = crypto_blkcipher_ivsize(desc->tfm); | |
299 | walk->alignmask = crypto_blkcipher_alignmask(desc->tfm); | |
5cde0af2 HX |
300 | return blkcipher_walk_first(desc, walk); |
301 | } | |
302 | EXPORT_SYMBOL_GPL(blkcipher_walk_virt); | |
303 | ||
304 | int blkcipher_walk_phys(struct blkcipher_desc *desc, | |
305 | struct blkcipher_walk *walk) | |
306 | { | |
307 | walk->flags |= BLKCIPHER_WALK_PHYS; | |
822be00f AB |
308 | walk->walk_blocksize = crypto_blkcipher_blocksize(desc->tfm); |
309 | walk->cipher_blocksize = walk->walk_blocksize; | |
310 | walk->ivsize = crypto_blkcipher_ivsize(desc->tfm); | |
311 | walk->alignmask = crypto_blkcipher_alignmask(desc->tfm); | |
5cde0af2 HX |
312 | return blkcipher_walk_first(desc, walk); |
313 | } | |
314 | EXPORT_SYMBOL_GPL(blkcipher_walk_phys); | |
315 | ||
316 | static int blkcipher_walk_first(struct blkcipher_desc *desc, | |
317 | struct blkcipher_walk *walk) | |
318 | { | |
fb469840 HX |
319 | if (WARN_ON_ONCE(in_irq())) |
320 | return -EDEADLK; | |
321 | ||
70d906bc | 322 | walk->iv = desc->info; |
5cde0af2 HX |
323 | walk->nbytes = walk->total; |
324 | if (unlikely(!walk->total)) | |
325 | return 0; | |
326 | ||
327 | walk->buffer = NULL; | |
822be00f AB |
328 | if (unlikely(((unsigned long)walk->iv & walk->alignmask))) { |
329 | int err = blkcipher_copy_iv(walk); | |
5cde0af2 HX |
330 | if (err) |
331 | return err; | |
332 | } | |
333 | ||
334 | scatterwalk_start(&walk->in, walk->in.sg); | |
335 | scatterwalk_start(&walk->out, walk->out.sg); | |
336 | walk->page = NULL; | |
337 | ||
338 | return blkcipher_walk_next(desc, walk); | |
339 | } | |
340 | ||
7607bd8f HX |
341 | int blkcipher_walk_virt_block(struct blkcipher_desc *desc, |
342 | struct blkcipher_walk *walk, | |
343 | unsigned int blocksize) | |
344 | { | |
345 | walk->flags &= ~BLKCIPHER_WALK_PHYS; | |
822be00f AB |
346 | walk->walk_blocksize = blocksize; |
347 | walk->cipher_blocksize = crypto_blkcipher_blocksize(desc->tfm); | |
348 | walk->ivsize = crypto_blkcipher_ivsize(desc->tfm); | |
349 | walk->alignmask = crypto_blkcipher_alignmask(desc->tfm); | |
7607bd8f HX |
350 | return blkcipher_walk_first(desc, walk); |
351 | } | |
352 | EXPORT_SYMBOL_GPL(blkcipher_walk_virt_block); | |
353 | ||
4f7f1d7c AB |
354 | int blkcipher_aead_walk_virt_block(struct blkcipher_desc *desc, |
355 | struct blkcipher_walk *walk, | |
356 | struct crypto_aead *tfm, | |
357 | unsigned int blocksize) | |
358 | { | |
359 | walk->flags &= ~BLKCIPHER_WALK_PHYS; | |
360 | walk->walk_blocksize = blocksize; | |
361 | walk->cipher_blocksize = crypto_aead_blocksize(tfm); | |
362 | walk->ivsize = crypto_aead_ivsize(tfm); | |
363 | walk->alignmask = crypto_aead_alignmask(tfm); | |
364 | return blkcipher_walk_first(desc, walk); | |
365 | } | |
366 | EXPORT_SYMBOL_GPL(blkcipher_aead_walk_virt_block); | |
367 | ||
791b4d5f HX |
368 | static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key, |
369 | unsigned int keylen) | |
ca7c3938 SS |
370 | { |
371 | struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher; | |
372 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); | |
373 | int ret; | |
374 | u8 *buffer, *alignbuffer; | |
375 | unsigned long absize; | |
376 | ||
377 | absize = keylen + alignmask; | |
378 | buffer = kmalloc(absize, GFP_ATOMIC); | |
379 | if (!buffer) | |
380 | return -ENOMEM; | |
381 | ||
382 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
383 | memcpy(alignbuffer, key, keylen); | |
384 | ret = cipher->setkey(tfm, alignbuffer, keylen); | |
06817176 | 385 | memset(alignbuffer, 0, keylen); |
ca7c3938 SS |
386 | kfree(buffer); |
387 | return ret; | |
388 | } | |
389 | ||
791b4d5f | 390 | static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) |
5cde0af2 HX |
391 | { |
392 | struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher; | |
ca7c3938 | 393 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); |
5cde0af2 HX |
394 | |
395 | if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) { | |
396 | tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; | |
397 | return -EINVAL; | |
398 | } | |
399 | ||
ca7c3938 SS |
400 | if ((unsigned long)key & alignmask) |
401 | return setkey_unaligned(tfm, key, keylen); | |
402 | ||
5cde0af2 HX |
403 | return cipher->setkey(tfm, key, keylen); |
404 | } | |
405 | ||
32e3983f HX |
406 | static int async_setkey(struct crypto_ablkcipher *tfm, const u8 *key, |
407 | unsigned int keylen) | |
408 | { | |
409 | return setkey(crypto_ablkcipher_tfm(tfm), key, keylen); | |
410 | } | |
411 | ||
412 | static int async_encrypt(struct ablkcipher_request *req) | |
413 | { | |
414 | struct crypto_tfm *tfm = req->base.tfm; | |
415 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; | |
416 | struct blkcipher_desc desc = { | |
417 | .tfm = __crypto_blkcipher_cast(tfm), | |
418 | .info = req->info, | |
419 | .flags = req->base.flags, | |
420 | }; | |
421 | ||
422 | ||
423 | return alg->encrypt(&desc, req->dst, req->src, req->nbytes); | |
424 | } | |
425 | ||
426 | static int async_decrypt(struct ablkcipher_request *req) | |
427 | { | |
428 | struct crypto_tfm *tfm = req->base.tfm; | |
429 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; | |
430 | struct blkcipher_desc desc = { | |
431 | .tfm = __crypto_blkcipher_cast(tfm), | |
432 | .info = req->info, | |
433 | .flags = req->base.flags, | |
434 | }; | |
435 | ||
436 | return alg->decrypt(&desc, req->dst, req->src, req->nbytes); | |
437 | } | |
438 | ||
27d2a330 HX |
439 | static unsigned int crypto_blkcipher_ctxsize(struct crypto_alg *alg, u32 type, |
440 | u32 mask) | |
5cde0af2 HX |
441 | { |
442 | struct blkcipher_alg *cipher = &alg->cra_blkcipher; | |
443 | unsigned int len = alg->cra_ctxsize; | |
444 | ||
332f8840 HX |
445 | if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK && |
446 | cipher->ivsize) { | |
5cde0af2 HX |
447 | len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1); |
448 | len += cipher->ivsize; | |
449 | } | |
450 | ||
451 | return len; | |
452 | } | |
453 | ||
32e3983f HX |
454 | static int crypto_init_blkcipher_ops_async(struct crypto_tfm *tfm) |
455 | { | |
456 | struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher; | |
457 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; | |
458 | ||
459 | crt->setkey = async_setkey; | |
460 | crt->encrypt = async_encrypt; | |
461 | crt->decrypt = async_decrypt; | |
ecfc4329 | 462 | crt->base = __crypto_ablkcipher_cast(tfm); |
32e3983f HX |
463 | crt->ivsize = alg->ivsize; |
464 | ||
465 | return 0; | |
466 | } | |
467 | ||
468 | static int crypto_init_blkcipher_ops_sync(struct crypto_tfm *tfm) | |
5cde0af2 HX |
469 | { |
470 | struct blkcipher_tfm *crt = &tfm->crt_blkcipher; | |
471 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; | |
472 | unsigned long align = crypto_tfm_alg_alignmask(tfm) + 1; | |
473 | unsigned long addr; | |
474 | ||
5cde0af2 HX |
475 | crt->setkey = setkey; |
476 | crt->encrypt = alg->encrypt; | |
477 | crt->decrypt = alg->decrypt; | |
478 | ||
479 | addr = (unsigned long)crypto_tfm_ctx(tfm); | |
480 | addr = ALIGN(addr, align); | |
481 | addr += ALIGN(tfm->__crt_alg->cra_ctxsize, align); | |
482 | crt->iv = (void *)addr; | |
483 | ||
484 | return 0; | |
485 | } | |
486 | ||
32e3983f HX |
487 | static int crypto_init_blkcipher_ops(struct crypto_tfm *tfm, u32 type, u32 mask) |
488 | { | |
489 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; | |
490 | ||
491 | if (alg->ivsize > PAGE_SIZE / 8) | |
492 | return -EINVAL; | |
493 | ||
332f8840 | 494 | if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK) |
32e3983f HX |
495 | return crypto_init_blkcipher_ops_sync(tfm); |
496 | else | |
497 | return crypto_init_blkcipher_ops_async(tfm); | |
498 | } | |
499 | ||
3acc8473 | 500 | #ifdef CONFIG_NET |
50496a1f SK |
501 | static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg) |
502 | { | |
503 | struct crypto_report_blkcipher rblkcipher; | |
504 | ||
37db69e0 EB |
505 | memset(&rblkcipher, 0, sizeof(rblkcipher)); |
506 | ||
507 | strscpy(rblkcipher.type, "blkcipher", sizeof(rblkcipher.type)); | |
c79b411e | 508 | strscpy(rblkcipher.geniv, "<default>", sizeof(rblkcipher.geniv)); |
50496a1f SK |
509 | |
510 | rblkcipher.blocksize = alg->cra_blocksize; | |
511 | rblkcipher.min_keysize = alg->cra_blkcipher.min_keysize; | |
512 | rblkcipher.max_keysize = alg->cra_blkcipher.max_keysize; | |
513 | rblkcipher.ivsize = alg->cra_blkcipher.ivsize; | |
514 | ||
37db69e0 EB |
515 | return nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER, |
516 | sizeof(rblkcipher), &rblkcipher); | |
50496a1f | 517 | } |
3acc8473 HX |
518 | #else |
519 | static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg) | |
520 | { | |
521 | return -ENOSYS; | |
522 | } | |
523 | #endif | |
50496a1f | 524 | |
5cde0af2 | 525 | static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg) |
d8c34b94 | 526 | __maybe_unused; |
5cde0af2 HX |
527 | static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg) |
528 | { | |
529 | seq_printf(m, "type : blkcipher\n"); | |
530 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
531 | seq_printf(m, "min keysize : %u\n", alg->cra_blkcipher.min_keysize); | |
532 | seq_printf(m, "max keysize : %u\n", alg->cra_blkcipher.max_keysize); | |
533 | seq_printf(m, "ivsize : %u\n", alg->cra_blkcipher.ivsize); | |
c79b411e | 534 | seq_printf(m, "geniv : <default>\n"); |
5cde0af2 HX |
535 | } |
536 | ||
537 | const struct crypto_type crypto_blkcipher_type = { | |
538 | .ctxsize = crypto_blkcipher_ctxsize, | |
539 | .init = crypto_init_blkcipher_ops, | |
540 | #ifdef CONFIG_PROC_FS | |
541 | .show = crypto_blkcipher_show, | |
542 | #endif | |
50496a1f | 543 | .report = crypto_blkcipher_report, |
5cde0af2 HX |
544 | }; |
545 | EXPORT_SYMBOL_GPL(crypto_blkcipher_type); | |
546 | ||
547 | MODULE_LICENSE("GPL"); | |
548 | MODULE_DESCRIPTION("Generic block chaining cipher type"); |