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Commit | Line | Data |
---|---|---|
5cde0af2 HX |
1 | /* |
2 | * Block chaining cipher operations. | |
3 | * | |
4 | * Generic encrypt/decrypt wrapper for ciphers, handles operations across | |
5 | * multiple page boundaries by using temporary blocks. In user context, | |
6 | * the kernel is given a chance to schedule us once per page. | |
7 | * | |
8 | * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify it | |
11 | * under the terms of the GNU General Public License as published by the Free | |
12 | * Software Foundation; either version 2 of the License, or (at your option) | |
13 | * any later version. | |
14 | * | |
15 | */ | |
16 | ||
ecfc4329 | 17 | #include <crypto/internal/skcipher.h> |
42c271c6 | 18 | #include <crypto/scatterwalk.h> |
5cde0af2 | 19 | #include <linux/errno.h> |
fb469840 | 20 | #include <linux/hardirq.h> |
5cde0af2 | 21 | #include <linux/kernel.h> |
5cde0af2 HX |
22 | #include <linux/module.h> |
23 | #include <linux/scatterlist.h> | |
24 | #include <linux/seq_file.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/string.h> | |
50496a1f SK |
27 | #include <linux/cryptouser.h> |
28 | #include <net/netlink.h> | |
5cde0af2 HX |
29 | |
30 | #include "internal.h" | |
5cde0af2 HX |
31 | |
32 | enum { | |
33 | BLKCIPHER_WALK_PHYS = 1 << 0, | |
34 | BLKCIPHER_WALK_SLOW = 1 << 1, | |
35 | BLKCIPHER_WALK_COPY = 1 << 2, | |
36 | BLKCIPHER_WALK_DIFF = 1 << 3, | |
37 | }; | |
38 | ||
39 | static int blkcipher_walk_next(struct blkcipher_desc *desc, | |
40 | struct blkcipher_walk *walk); | |
41 | static int blkcipher_walk_first(struct blkcipher_desc *desc, | |
42 | struct blkcipher_walk *walk); | |
43 | ||
44 | static inline void blkcipher_map_src(struct blkcipher_walk *walk) | |
45 | { | |
f0dfc0b0 | 46 | walk->src.virt.addr = scatterwalk_map(&walk->in); |
5cde0af2 HX |
47 | } |
48 | ||
49 | static inline void blkcipher_map_dst(struct blkcipher_walk *walk) | |
50 | { | |
f0dfc0b0 | 51 | walk->dst.virt.addr = scatterwalk_map(&walk->out); |
5cde0af2 HX |
52 | } |
53 | ||
54 | static inline void blkcipher_unmap_src(struct blkcipher_walk *walk) | |
55 | { | |
f0dfc0b0 | 56 | scatterwalk_unmap(walk->src.virt.addr); |
5cde0af2 HX |
57 | } |
58 | ||
59 | static inline void blkcipher_unmap_dst(struct blkcipher_walk *walk) | |
60 | { | |
f0dfc0b0 | 61 | scatterwalk_unmap(walk->dst.virt.addr); |
5cde0af2 HX |
62 | } |
63 | ||
e4630f9f HX |
64 | /* Get a spot of the specified length that does not straddle a page. |
65 | * The caller needs to ensure that there is enough space for this operation. | |
66 | */ | |
5cde0af2 HX |
67 | static inline u8 *blkcipher_get_spot(u8 *start, unsigned int len) |
68 | { | |
e4630f9f | 69 | u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK); |
5aaff0c8 | 70 | return max(start, end_page); |
5cde0af2 HX |
71 | } |
72 | ||
73 | static inline unsigned int blkcipher_done_slow(struct crypto_blkcipher *tfm, | |
74 | struct blkcipher_walk *walk, | |
75 | unsigned int bsize) | |
76 | { | |
77 | u8 *addr; | |
78 | unsigned int alignmask = crypto_blkcipher_alignmask(tfm); | |
79 | ||
80 | addr = (u8 *)ALIGN((unsigned long)walk->buffer, alignmask + 1); | |
81 | addr = blkcipher_get_spot(addr, bsize); | |
82 | scatterwalk_copychunks(addr, &walk->out, bsize, 1); | |
83 | return bsize; | |
84 | } | |
85 | ||
86 | static inline unsigned int blkcipher_done_fast(struct blkcipher_walk *walk, | |
87 | unsigned int n) | |
88 | { | |
5cde0af2 HX |
89 | if (walk->flags & BLKCIPHER_WALK_COPY) { |
90 | blkcipher_map_dst(walk); | |
91 | memcpy(walk->dst.virt.addr, walk->page, n); | |
92 | blkcipher_unmap_dst(walk); | |
93 | } else if (!(walk->flags & BLKCIPHER_WALK_PHYS)) { | |
5cde0af2 HX |
94 | if (walk->flags & BLKCIPHER_WALK_DIFF) |
95 | blkcipher_unmap_dst(walk); | |
61ecdb80 | 96 | blkcipher_unmap_src(walk); |
5cde0af2 HX |
97 | } |
98 | ||
99 | scatterwalk_advance(&walk->in, n); | |
100 | scatterwalk_advance(&walk->out, n); | |
101 | ||
102 | return n; | |
103 | } | |
104 | ||
105 | int blkcipher_walk_done(struct blkcipher_desc *desc, | |
106 | struct blkcipher_walk *walk, int err) | |
107 | { | |
108 | struct crypto_blkcipher *tfm = desc->tfm; | |
109 | unsigned int nbytes = 0; | |
110 | ||
111 | if (likely(err >= 0)) { | |
7607bd8f | 112 | unsigned int n = walk->nbytes - err; |
5cde0af2 HX |
113 | |
114 | if (likely(!(walk->flags & BLKCIPHER_WALK_SLOW))) | |
7607bd8f HX |
115 | n = blkcipher_done_fast(walk, n); |
116 | else if (WARN_ON(err)) { | |
117 | err = -EINVAL; | |
118 | goto err; | |
119 | } else | |
120 | n = blkcipher_done_slow(tfm, walk, n); | |
5cde0af2 HX |
121 | |
122 | nbytes = walk->total - n; | |
123 | err = 0; | |
124 | } | |
125 | ||
126 | scatterwalk_done(&walk->in, 0, nbytes); | |
127 | scatterwalk_done(&walk->out, 1, nbytes); | |
128 | ||
bac1b5c4 | 129 | err: |
5cde0af2 HX |
130 | walk->total = nbytes; |
131 | walk->nbytes = nbytes; | |
132 | ||
133 | if (nbytes) { | |
134 | crypto_yield(desc->flags); | |
135 | return blkcipher_walk_next(desc, walk); | |
136 | } | |
137 | ||
138 | if (walk->iv != desc->info) | |
139 | memcpy(desc->info, walk->iv, crypto_blkcipher_ivsize(tfm)); | |
140 | if (walk->buffer != walk->page) | |
141 | kfree(walk->buffer); | |
142 | if (walk->page) | |
143 | free_page((unsigned long)walk->page); | |
144 | ||
145 | return err; | |
146 | } | |
147 | EXPORT_SYMBOL_GPL(blkcipher_walk_done); | |
148 | ||
149 | static inline int blkcipher_next_slow(struct blkcipher_desc *desc, | |
150 | struct blkcipher_walk *walk, | |
151 | unsigned int bsize, | |
152 | unsigned int alignmask) | |
153 | { | |
154 | unsigned int n; | |
70613783 | 155 | unsigned aligned_bsize = ALIGN(bsize, alignmask + 1); |
5cde0af2 HX |
156 | |
157 | if (walk->buffer) | |
158 | goto ok; | |
159 | ||
160 | walk->buffer = walk->page; | |
161 | if (walk->buffer) | |
162 | goto ok; | |
163 | ||
2614de1b | 164 | n = aligned_bsize * 3 - (alignmask + 1) + |
e4630f9f | 165 | (alignmask & ~(crypto_tfm_ctx_alignment() - 1)); |
5cde0af2 HX |
166 | walk->buffer = kmalloc(n, GFP_ATOMIC); |
167 | if (!walk->buffer) | |
168 | return blkcipher_walk_done(desc, walk, -ENOMEM); | |
169 | ||
170 | ok: | |
171 | walk->dst.virt.addr = (u8 *)ALIGN((unsigned long)walk->buffer, | |
172 | alignmask + 1); | |
173 | walk->dst.virt.addr = blkcipher_get_spot(walk->dst.virt.addr, bsize); | |
70613783 HX |
174 | walk->src.virt.addr = blkcipher_get_spot(walk->dst.virt.addr + |
175 | aligned_bsize, bsize); | |
5cde0af2 HX |
176 | |
177 | scatterwalk_copychunks(walk->src.virt.addr, &walk->in, bsize, 0); | |
178 | ||
179 | walk->nbytes = bsize; | |
180 | walk->flags |= BLKCIPHER_WALK_SLOW; | |
181 | ||
182 | return 0; | |
183 | } | |
184 | ||
185 | static inline int blkcipher_next_copy(struct blkcipher_walk *walk) | |
186 | { | |
187 | u8 *tmp = walk->page; | |
188 | ||
189 | blkcipher_map_src(walk); | |
190 | memcpy(tmp, walk->src.virt.addr, walk->nbytes); | |
191 | blkcipher_unmap_src(walk); | |
192 | ||
193 | walk->src.virt.addr = tmp; | |
194 | walk->dst.virt.addr = tmp; | |
195 | ||
196 | return 0; | |
197 | } | |
198 | ||
199 | static inline int blkcipher_next_fast(struct blkcipher_desc *desc, | |
200 | struct blkcipher_walk *walk) | |
201 | { | |
202 | unsigned long diff; | |
203 | ||
204 | walk->src.phys.page = scatterwalk_page(&walk->in); | |
205 | walk->src.phys.offset = offset_in_page(walk->in.offset); | |
206 | walk->dst.phys.page = scatterwalk_page(&walk->out); | |
207 | walk->dst.phys.offset = offset_in_page(walk->out.offset); | |
208 | ||
209 | if (walk->flags & BLKCIPHER_WALK_PHYS) | |
210 | return 0; | |
211 | ||
212 | diff = walk->src.phys.offset - walk->dst.phys.offset; | |
213 | diff |= walk->src.virt.page - walk->dst.virt.page; | |
214 | ||
215 | blkcipher_map_src(walk); | |
216 | walk->dst.virt.addr = walk->src.virt.addr; | |
217 | ||
218 | if (diff) { | |
219 | walk->flags |= BLKCIPHER_WALK_DIFF; | |
220 | blkcipher_map_dst(walk); | |
221 | } | |
222 | ||
223 | return 0; | |
224 | } | |
225 | ||
226 | static int blkcipher_walk_next(struct blkcipher_desc *desc, | |
227 | struct blkcipher_walk *walk) | |
228 | { | |
229 | struct crypto_blkcipher *tfm = desc->tfm; | |
230 | unsigned int alignmask = crypto_blkcipher_alignmask(tfm); | |
7607bd8f | 231 | unsigned int bsize; |
5cde0af2 HX |
232 | unsigned int n; |
233 | int err; | |
234 | ||
235 | n = walk->total; | |
7607bd8f | 236 | if (unlikely(n < crypto_blkcipher_blocksize(tfm))) { |
5cde0af2 HX |
237 | desc->flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN; |
238 | return blkcipher_walk_done(desc, walk, -EINVAL); | |
239 | } | |
240 | ||
241 | walk->flags &= ~(BLKCIPHER_WALK_SLOW | BLKCIPHER_WALK_COPY | | |
242 | BLKCIPHER_WALK_DIFF); | |
243 | if (!scatterwalk_aligned(&walk->in, alignmask) || | |
244 | !scatterwalk_aligned(&walk->out, alignmask)) { | |
245 | walk->flags |= BLKCIPHER_WALK_COPY; | |
246 | if (!walk->page) { | |
247 | walk->page = (void *)__get_free_page(GFP_ATOMIC); | |
248 | if (!walk->page) | |
249 | n = 0; | |
250 | } | |
251 | } | |
252 | ||
7607bd8f | 253 | bsize = min(walk->blocksize, n); |
5cde0af2 HX |
254 | n = scatterwalk_clamp(&walk->in, n); |
255 | n = scatterwalk_clamp(&walk->out, n); | |
256 | ||
257 | if (unlikely(n < bsize)) { | |
258 | err = blkcipher_next_slow(desc, walk, bsize, alignmask); | |
259 | goto set_phys_lowmem; | |
260 | } | |
261 | ||
262 | walk->nbytes = n; | |
263 | if (walk->flags & BLKCIPHER_WALK_COPY) { | |
264 | err = blkcipher_next_copy(walk); | |
265 | goto set_phys_lowmem; | |
266 | } | |
267 | ||
268 | return blkcipher_next_fast(desc, walk); | |
269 | ||
270 | set_phys_lowmem: | |
271 | if (walk->flags & BLKCIPHER_WALK_PHYS) { | |
272 | walk->src.phys.page = virt_to_page(walk->src.virt.addr); | |
273 | walk->dst.phys.page = virt_to_page(walk->dst.virt.addr); | |
274 | walk->src.phys.offset &= PAGE_SIZE - 1; | |
275 | walk->dst.phys.offset &= PAGE_SIZE - 1; | |
276 | } | |
277 | return err; | |
278 | } | |
279 | ||
280 | static inline int blkcipher_copy_iv(struct blkcipher_walk *walk, | |
281 | struct crypto_blkcipher *tfm, | |
282 | unsigned int alignmask) | |
283 | { | |
7607bd8f | 284 | unsigned bs = walk->blocksize; |
5cde0af2 | 285 | unsigned int ivsize = crypto_blkcipher_ivsize(tfm); |
70613783 HX |
286 | unsigned aligned_bs = ALIGN(bs, alignmask + 1); |
287 | unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) - | |
288 | (alignmask + 1); | |
5cde0af2 HX |
289 | u8 *iv; |
290 | ||
291 | size += alignmask & ~(crypto_tfm_ctx_alignment() - 1); | |
292 | walk->buffer = kmalloc(size, GFP_ATOMIC); | |
293 | if (!walk->buffer) | |
294 | return -ENOMEM; | |
295 | ||
296 | iv = (u8 *)ALIGN((unsigned long)walk->buffer, alignmask + 1); | |
70613783 HX |
297 | iv = blkcipher_get_spot(iv, bs) + aligned_bs; |
298 | iv = blkcipher_get_spot(iv, bs) + aligned_bs; | |
5cde0af2 HX |
299 | iv = blkcipher_get_spot(iv, ivsize); |
300 | ||
301 | walk->iv = memcpy(iv, walk->iv, ivsize); | |
302 | return 0; | |
303 | } | |
304 | ||
305 | int blkcipher_walk_virt(struct blkcipher_desc *desc, | |
306 | struct blkcipher_walk *walk) | |
307 | { | |
308 | walk->flags &= ~BLKCIPHER_WALK_PHYS; | |
7607bd8f | 309 | walk->blocksize = crypto_blkcipher_blocksize(desc->tfm); |
5cde0af2 HX |
310 | return blkcipher_walk_first(desc, walk); |
311 | } | |
312 | EXPORT_SYMBOL_GPL(blkcipher_walk_virt); | |
313 | ||
314 | int blkcipher_walk_phys(struct blkcipher_desc *desc, | |
315 | struct blkcipher_walk *walk) | |
316 | { | |
317 | walk->flags |= BLKCIPHER_WALK_PHYS; | |
7607bd8f | 318 | walk->blocksize = crypto_blkcipher_blocksize(desc->tfm); |
5cde0af2 HX |
319 | return blkcipher_walk_first(desc, walk); |
320 | } | |
321 | EXPORT_SYMBOL_GPL(blkcipher_walk_phys); | |
322 | ||
323 | static int blkcipher_walk_first(struct blkcipher_desc *desc, | |
324 | struct blkcipher_walk *walk) | |
325 | { | |
326 | struct crypto_blkcipher *tfm = desc->tfm; | |
327 | unsigned int alignmask = crypto_blkcipher_alignmask(tfm); | |
328 | ||
fb469840 HX |
329 | if (WARN_ON_ONCE(in_irq())) |
330 | return -EDEADLK; | |
331 | ||
5cde0af2 HX |
332 | walk->nbytes = walk->total; |
333 | if (unlikely(!walk->total)) | |
334 | return 0; | |
335 | ||
336 | walk->buffer = NULL; | |
337 | walk->iv = desc->info; | |
338 | if (unlikely(((unsigned long)walk->iv & alignmask))) { | |
339 | int err = blkcipher_copy_iv(walk, tfm, alignmask); | |
340 | if (err) | |
341 | return err; | |
342 | } | |
343 | ||
344 | scatterwalk_start(&walk->in, walk->in.sg); | |
345 | scatterwalk_start(&walk->out, walk->out.sg); | |
346 | walk->page = NULL; | |
347 | ||
348 | return blkcipher_walk_next(desc, walk); | |
349 | } | |
350 | ||
7607bd8f HX |
351 | int blkcipher_walk_virt_block(struct blkcipher_desc *desc, |
352 | struct blkcipher_walk *walk, | |
353 | unsigned int blocksize) | |
354 | { | |
355 | walk->flags &= ~BLKCIPHER_WALK_PHYS; | |
356 | walk->blocksize = blocksize; | |
357 | return blkcipher_walk_first(desc, walk); | |
358 | } | |
359 | EXPORT_SYMBOL_GPL(blkcipher_walk_virt_block); | |
360 | ||
791b4d5f HX |
361 | static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key, |
362 | unsigned int keylen) | |
ca7c3938 SS |
363 | { |
364 | struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher; | |
365 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); | |
366 | int ret; | |
367 | u8 *buffer, *alignbuffer; | |
368 | unsigned long absize; | |
369 | ||
370 | absize = keylen + alignmask; | |
371 | buffer = kmalloc(absize, GFP_ATOMIC); | |
372 | if (!buffer) | |
373 | return -ENOMEM; | |
374 | ||
375 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
376 | memcpy(alignbuffer, key, keylen); | |
377 | ret = cipher->setkey(tfm, alignbuffer, keylen); | |
06817176 | 378 | memset(alignbuffer, 0, keylen); |
ca7c3938 SS |
379 | kfree(buffer); |
380 | return ret; | |
381 | } | |
382 | ||
791b4d5f | 383 | static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) |
5cde0af2 HX |
384 | { |
385 | struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher; | |
ca7c3938 | 386 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); |
5cde0af2 HX |
387 | |
388 | if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) { | |
389 | tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; | |
390 | return -EINVAL; | |
391 | } | |
392 | ||
ca7c3938 SS |
393 | if ((unsigned long)key & alignmask) |
394 | return setkey_unaligned(tfm, key, keylen); | |
395 | ||
5cde0af2 HX |
396 | return cipher->setkey(tfm, key, keylen); |
397 | } | |
398 | ||
32e3983f HX |
399 | static int async_setkey(struct crypto_ablkcipher *tfm, const u8 *key, |
400 | unsigned int keylen) | |
401 | { | |
402 | return setkey(crypto_ablkcipher_tfm(tfm), key, keylen); | |
403 | } | |
404 | ||
405 | static int async_encrypt(struct ablkcipher_request *req) | |
406 | { | |
407 | struct crypto_tfm *tfm = req->base.tfm; | |
408 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; | |
409 | struct blkcipher_desc desc = { | |
410 | .tfm = __crypto_blkcipher_cast(tfm), | |
411 | .info = req->info, | |
412 | .flags = req->base.flags, | |
413 | }; | |
414 | ||
415 | ||
416 | return alg->encrypt(&desc, req->dst, req->src, req->nbytes); | |
417 | } | |
418 | ||
419 | static int async_decrypt(struct ablkcipher_request *req) | |
420 | { | |
421 | struct crypto_tfm *tfm = req->base.tfm; | |
422 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; | |
423 | struct blkcipher_desc desc = { | |
424 | .tfm = __crypto_blkcipher_cast(tfm), | |
425 | .info = req->info, | |
426 | .flags = req->base.flags, | |
427 | }; | |
428 | ||
429 | return alg->decrypt(&desc, req->dst, req->src, req->nbytes); | |
430 | } | |
431 | ||
27d2a330 HX |
432 | static unsigned int crypto_blkcipher_ctxsize(struct crypto_alg *alg, u32 type, |
433 | u32 mask) | |
5cde0af2 HX |
434 | { |
435 | struct blkcipher_alg *cipher = &alg->cra_blkcipher; | |
436 | unsigned int len = alg->cra_ctxsize; | |
437 | ||
332f8840 HX |
438 | if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK && |
439 | cipher->ivsize) { | |
5cde0af2 HX |
440 | len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1); |
441 | len += cipher->ivsize; | |
442 | } | |
443 | ||
444 | return len; | |
445 | } | |
446 | ||
32e3983f HX |
447 | static int crypto_init_blkcipher_ops_async(struct crypto_tfm *tfm) |
448 | { | |
449 | struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher; | |
450 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; | |
451 | ||
452 | crt->setkey = async_setkey; | |
453 | crt->encrypt = async_encrypt; | |
454 | crt->decrypt = async_decrypt; | |
b9c55aa4 HX |
455 | if (!alg->ivsize) { |
456 | crt->givencrypt = skcipher_null_givencrypt; | |
457 | crt->givdecrypt = skcipher_null_givdecrypt; | |
458 | } | |
ecfc4329 | 459 | crt->base = __crypto_ablkcipher_cast(tfm); |
32e3983f HX |
460 | crt->ivsize = alg->ivsize; |
461 | ||
462 | return 0; | |
463 | } | |
464 | ||
465 | static int crypto_init_blkcipher_ops_sync(struct crypto_tfm *tfm) | |
5cde0af2 HX |
466 | { |
467 | struct blkcipher_tfm *crt = &tfm->crt_blkcipher; | |
468 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; | |
469 | unsigned long align = crypto_tfm_alg_alignmask(tfm) + 1; | |
470 | unsigned long addr; | |
471 | ||
5cde0af2 HX |
472 | crt->setkey = setkey; |
473 | crt->encrypt = alg->encrypt; | |
474 | crt->decrypt = alg->decrypt; | |
475 | ||
476 | addr = (unsigned long)crypto_tfm_ctx(tfm); | |
477 | addr = ALIGN(addr, align); | |
478 | addr += ALIGN(tfm->__crt_alg->cra_ctxsize, align); | |
479 | crt->iv = (void *)addr; | |
480 | ||
481 | return 0; | |
482 | } | |
483 | ||
32e3983f HX |
484 | static int crypto_init_blkcipher_ops(struct crypto_tfm *tfm, u32 type, u32 mask) |
485 | { | |
486 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; | |
487 | ||
488 | if (alg->ivsize > PAGE_SIZE / 8) | |
489 | return -EINVAL; | |
490 | ||
332f8840 | 491 | if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK) |
32e3983f HX |
492 | return crypto_init_blkcipher_ops_sync(tfm); |
493 | else | |
494 | return crypto_init_blkcipher_ops_async(tfm); | |
495 | } | |
496 | ||
3acc8473 | 497 | #ifdef CONFIG_NET |
50496a1f SK |
498 | static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg) |
499 | { | |
500 | struct crypto_report_blkcipher rblkcipher; | |
501 | ||
502 | snprintf(rblkcipher.type, CRYPTO_MAX_ALG_NAME, "%s", "blkcipher"); | |
503 | snprintf(rblkcipher.geniv, CRYPTO_MAX_ALG_NAME, "%s", | |
504 | alg->cra_blkcipher.geniv ?: "<default>"); | |
505 | ||
506 | rblkcipher.blocksize = alg->cra_blocksize; | |
507 | rblkcipher.min_keysize = alg->cra_blkcipher.min_keysize; | |
508 | rblkcipher.max_keysize = alg->cra_blkcipher.max_keysize; | |
509 | rblkcipher.ivsize = alg->cra_blkcipher.ivsize; | |
510 | ||
6662df33 DM |
511 | if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER, |
512 | sizeof(struct crypto_report_blkcipher), &rblkcipher)) | |
513 | goto nla_put_failure; | |
50496a1f SK |
514 | return 0; |
515 | ||
516 | nla_put_failure: | |
517 | return -EMSGSIZE; | |
518 | } | |
3acc8473 HX |
519 | #else |
520 | static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg) | |
521 | { | |
522 | return -ENOSYS; | |
523 | } | |
524 | #endif | |
50496a1f | 525 | |
5cde0af2 | 526 | static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg) |
03f5d8ce | 527 | __attribute__ ((unused)); |
5cde0af2 HX |
528 | static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg) |
529 | { | |
530 | seq_printf(m, "type : blkcipher\n"); | |
531 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
532 | seq_printf(m, "min keysize : %u\n", alg->cra_blkcipher.min_keysize); | |
533 | seq_printf(m, "max keysize : %u\n", alg->cra_blkcipher.max_keysize); | |
534 | seq_printf(m, "ivsize : %u\n", alg->cra_blkcipher.ivsize); | |
23508e11 HX |
535 | seq_printf(m, "geniv : %s\n", alg->cra_blkcipher.geniv ?: |
536 | "<default>"); | |
5cde0af2 HX |
537 | } |
538 | ||
539 | const struct crypto_type crypto_blkcipher_type = { | |
540 | .ctxsize = crypto_blkcipher_ctxsize, | |
541 | .init = crypto_init_blkcipher_ops, | |
542 | #ifdef CONFIG_PROC_FS | |
543 | .show = crypto_blkcipher_show, | |
544 | #endif | |
50496a1f | 545 | .report = crypto_blkcipher_report, |
5cde0af2 HX |
546 | }; |
547 | EXPORT_SYMBOL_GPL(crypto_blkcipher_type); | |
548 | ||
ecfc4329 HX |
549 | static int crypto_grab_nivcipher(struct crypto_skcipher_spawn *spawn, |
550 | const char *name, u32 type, u32 mask) | |
551 | { | |
552 | struct crypto_alg *alg; | |
553 | int err; | |
554 | ||
555 | type = crypto_skcipher_type(type); | |
b170a137 | 556 | mask = crypto_skcipher_mask(mask)| CRYPTO_ALG_GENIV; |
ecfc4329 HX |
557 | |
558 | alg = crypto_alg_mod_lookup(name, type, mask); | |
559 | if (IS_ERR(alg)) | |
560 | return PTR_ERR(alg); | |
561 | ||
562 | err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask); | |
563 | crypto_mod_put(alg); | |
564 | return err; | |
565 | } | |
566 | ||
567 | struct crypto_instance *skcipher_geniv_alloc(struct crypto_template *tmpl, | |
568 | struct rtattr **tb, u32 type, | |
569 | u32 mask) | |
570 | { | |
571 | struct { | |
572 | int (*setkey)(struct crypto_ablkcipher *tfm, const u8 *key, | |
573 | unsigned int keylen); | |
574 | int (*encrypt)(struct ablkcipher_request *req); | |
575 | int (*decrypt)(struct ablkcipher_request *req); | |
576 | ||
577 | unsigned int min_keysize; | |
578 | unsigned int max_keysize; | |
579 | unsigned int ivsize; | |
580 | ||
581 | const char *geniv; | |
582 | } balg; | |
583 | const char *name; | |
584 | struct crypto_skcipher_spawn *spawn; | |
585 | struct crypto_attr_type *algt; | |
586 | struct crypto_instance *inst; | |
587 | struct crypto_alg *alg; | |
588 | int err; | |
589 | ||
590 | algt = crypto_get_attr_type(tb); | |
591 | err = PTR_ERR(algt); | |
592 | if (IS_ERR(algt)) | |
593 | return ERR_PTR(err); | |
594 | ||
595 | if ((algt->type ^ (CRYPTO_ALG_TYPE_GIVCIPHER | CRYPTO_ALG_GENIV)) & | |
596 | algt->mask) | |
597 | return ERR_PTR(-EINVAL); | |
598 | ||
599 | name = crypto_attr_alg_name(tb[1]); | |
600 | err = PTR_ERR(name); | |
601 | if (IS_ERR(name)) | |
602 | return ERR_PTR(err); | |
603 | ||
604 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); | |
605 | if (!inst) | |
606 | return ERR_PTR(-ENOMEM); | |
607 | ||
608 | spawn = crypto_instance_ctx(inst); | |
609 | ||
610 | /* Ignore async algorithms if necessary. */ | |
611 | mask |= crypto_requires_sync(algt->type, algt->mask); | |
612 | ||
613 | crypto_set_skcipher_spawn(spawn, inst); | |
614 | err = crypto_grab_nivcipher(spawn, name, type, mask); | |
615 | if (err) | |
616 | goto err_free_inst; | |
617 | ||
618 | alg = crypto_skcipher_spawn_alg(spawn); | |
619 | ||
620 | if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == | |
621 | CRYPTO_ALG_TYPE_BLKCIPHER) { | |
622 | balg.ivsize = alg->cra_blkcipher.ivsize; | |
623 | balg.min_keysize = alg->cra_blkcipher.min_keysize; | |
624 | balg.max_keysize = alg->cra_blkcipher.max_keysize; | |
625 | ||
626 | balg.setkey = async_setkey; | |
627 | balg.encrypt = async_encrypt; | |
628 | balg.decrypt = async_decrypt; | |
629 | ||
630 | balg.geniv = alg->cra_blkcipher.geniv; | |
631 | } else { | |
632 | balg.ivsize = alg->cra_ablkcipher.ivsize; | |
633 | balg.min_keysize = alg->cra_ablkcipher.min_keysize; | |
634 | balg.max_keysize = alg->cra_ablkcipher.max_keysize; | |
635 | ||
636 | balg.setkey = alg->cra_ablkcipher.setkey; | |
637 | balg.encrypt = alg->cra_ablkcipher.encrypt; | |
638 | balg.decrypt = alg->cra_ablkcipher.decrypt; | |
639 | ||
640 | balg.geniv = alg->cra_ablkcipher.geniv; | |
641 | } | |
642 | ||
643 | err = -EINVAL; | |
644 | if (!balg.ivsize) | |
645 | goto err_drop_alg; | |
646 | ||
647 | /* | |
648 | * This is only true if we're constructing an algorithm with its | |
649 | * default IV generator. For the default generator we elide the | |
650 | * template name and double-check the IV generator. | |
651 | */ | |
652 | if (algt->mask & CRYPTO_ALG_GENIV) { | |
653 | if (!balg.geniv) | |
654 | balg.geniv = crypto_default_geniv(alg); | |
655 | err = -EAGAIN; | |
656 | if (strcmp(tmpl->name, balg.geniv)) | |
657 | goto err_drop_alg; | |
658 | ||
659 | memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); | |
660 | memcpy(inst->alg.cra_driver_name, alg->cra_driver_name, | |
661 | CRYPTO_MAX_ALG_NAME); | |
662 | } else { | |
663 | err = -ENAMETOOLONG; | |
664 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, | |
665 | "%s(%s)", tmpl->name, alg->cra_name) >= | |
666 | CRYPTO_MAX_ALG_NAME) | |
667 | goto err_drop_alg; | |
668 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, | |
669 | "%s(%s)", tmpl->name, alg->cra_driver_name) >= | |
670 | CRYPTO_MAX_ALG_NAME) | |
671 | goto err_drop_alg; | |
672 | } | |
673 | ||
674 | inst->alg.cra_flags = CRYPTO_ALG_TYPE_GIVCIPHER | CRYPTO_ALG_GENIV; | |
675 | inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC; | |
676 | inst->alg.cra_priority = alg->cra_priority; | |
677 | inst->alg.cra_blocksize = alg->cra_blocksize; | |
678 | inst->alg.cra_alignmask = alg->cra_alignmask; | |
679 | inst->alg.cra_type = &crypto_givcipher_type; | |
680 | ||
681 | inst->alg.cra_ablkcipher.ivsize = balg.ivsize; | |
682 | inst->alg.cra_ablkcipher.min_keysize = balg.min_keysize; | |
683 | inst->alg.cra_ablkcipher.max_keysize = balg.max_keysize; | |
684 | inst->alg.cra_ablkcipher.geniv = balg.geniv; | |
685 | ||
686 | inst->alg.cra_ablkcipher.setkey = balg.setkey; | |
687 | inst->alg.cra_ablkcipher.encrypt = balg.encrypt; | |
688 | inst->alg.cra_ablkcipher.decrypt = balg.decrypt; | |
689 | ||
690 | out: | |
691 | return inst; | |
692 | ||
693 | err_drop_alg: | |
694 | crypto_drop_skcipher(spawn); | |
695 | err_free_inst: | |
696 | kfree(inst); | |
697 | inst = ERR_PTR(err); | |
698 | goto out; | |
699 | } | |
700 | EXPORT_SYMBOL_GPL(skcipher_geniv_alloc); | |
701 | ||
702 | void skcipher_geniv_free(struct crypto_instance *inst) | |
703 | { | |
704 | crypto_drop_skcipher(crypto_instance_ctx(inst)); | |
705 | kfree(inst); | |
706 | } | |
707 | EXPORT_SYMBOL_GPL(skcipher_geniv_free); | |
708 | ||
709 | int skcipher_geniv_init(struct crypto_tfm *tfm) | |
710 | { | |
711 | struct crypto_instance *inst = (void *)tfm->__crt_alg; | |
712 | struct crypto_ablkcipher *cipher; | |
713 | ||
714 | cipher = crypto_spawn_skcipher(crypto_instance_ctx(inst)); | |
715 | if (IS_ERR(cipher)) | |
716 | return PTR_ERR(cipher); | |
717 | ||
718 | tfm->crt_ablkcipher.base = cipher; | |
719 | tfm->crt_ablkcipher.reqsize += crypto_ablkcipher_reqsize(cipher); | |
720 | ||
721 | return 0; | |
722 | } | |
723 | EXPORT_SYMBOL_GPL(skcipher_geniv_init); | |
724 | ||
725 | void skcipher_geniv_exit(struct crypto_tfm *tfm) | |
726 | { | |
727 | crypto_free_ablkcipher(tfm->crt_ablkcipher.base); | |
728 | } | |
729 | EXPORT_SYMBOL_GPL(skcipher_geniv_exit); | |
730 | ||
5cde0af2 HX |
731 | MODULE_LICENSE("GPL"); |
732 | MODULE_DESCRIPTION("Generic block chaining cipher type"); |