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 | ||
d1a2fd50 | 17 | #include <crypto/aead.h> |
ecfc4329 | 18 | #include <crypto/internal/skcipher.h> |
42c271c6 | 19 | #include <crypto/scatterwalk.h> |
5cde0af2 | 20 | #include <linux/errno.h> |
fb469840 | 21 | #include <linux/hardirq.h> |
5cde0af2 | 22 | #include <linux/kernel.h> |
5cde0af2 HX |
23 | #include <linux/module.h> |
24 | #include <linux/scatterlist.h> | |
25 | #include <linux/seq_file.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/string.h> | |
50496a1f SK |
28 | #include <linux/cryptouser.h> |
29 | #include <net/netlink.h> | |
5cde0af2 HX |
30 | |
31 | #include "internal.h" | |
5cde0af2 HX |
32 | |
33 | enum { | |
34 | BLKCIPHER_WALK_PHYS = 1 << 0, | |
35 | BLKCIPHER_WALK_SLOW = 1 << 1, | |
36 | BLKCIPHER_WALK_COPY = 1 << 2, | |
37 | BLKCIPHER_WALK_DIFF = 1 << 3, | |
38 | }; | |
39 | ||
40 | static int blkcipher_walk_next(struct blkcipher_desc *desc, | |
41 | struct blkcipher_walk *walk); | |
42 | static int blkcipher_walk_first(struct blkcipher_desc *desc, | |
43 | struct blkcipher_walk *walk); | |
44 | ||
45 | static inline void blkcipher_map_src(struct blkcipher_walk *walk) | |
46 | { | |
f0dfc0b0 | 47 | walk->src.virt.addr = scatterwalk_map(&walk->in); |
5cde0af2 HX |
48 | } |
49 | ||
50 | static inline void blkcipher_map_dst(struct blkcipher_walk *walk) | |
51 | { | |
f0dfc0b0 | 52 | walk->dst.virt.addr = scatterwalk_map(&walk->out); |
5cde0af2 HX |
53 | } |
54 | ||
55 | static inline void blkcipher_unmap_src(struct blkcipher_walk *walk) | |
56 | { | |
f0dfc0b0 | 57 | scatterwalk_unmap(walk->src.virt.addr); |
5cde0af2 HX |
58 | } |
59 | ||
60 | static inline void blkcipher_unmap_dst(struct blkcipher_walk *walk) | |
61 | { | |
f0dfc0b0 | 62 | scatterwalk_unmap(walk->dst.virt.addr); |
5cde0af2 HX |
63 | } |
64 | ||
e4630f9f HX |
65 | /* Get a spot of the specified length that does not straddle a page. |
66 | * The caller needs to ensure that there is enough space for this operation. | |
67 | */ | |
5cde0af2 HX |
68 | static inline u8 *blkcipher_get_spot(u8 *start, unsigned int len) |
69 | { | |
e4630f9f | 70 | u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK); |
5aaff0c8 | 71 | return max(start, end_page); |
5cde0af2 HX |
72 | } |
73 | ||
822be00f | 74 | static inline unsigned int blkcipher_done_slow(struct blkcipher_walk *walk, |
5cde0af2 HX |
75 | unsigned int bsize) |
76 | { | |
77 | u8 *addr; | |
5cde0af2 | 78 | |
822be00f | 79 | addr = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1); |
5cde0af2 HX |
80 | addr = blkcipher_get_spot(addr, bsize); |
81 | scatterwalk_copychunks(addr, &walk->out, bsize, 1); | |
82 | return bsize; | |
83 | } | |
84 | ||
85 | static inline unsigned int blkcipher_done_fast(struct blkcipher_walk *walk, | |
86 | unsigned int n) | |
87 | { | |
5cde0af2 HX |
88 | if (walk->flags & BLKCIPHER_WALK_COPY) { |
89 | blkcipher_map_dst(walk); | |
90 | memcpy(walk->dst.virt.addr, walk->page, n); | |
91 | blkcipher_unmap_dst(walk); | |
92 | } else if (!(walk->flags & BLKCIPHER_WALK_PHYS)) { | |
5cde0af2 HX |
93 | if (walk->flags & BLKCIPHER_WALK_DIFF) |
94 | blkcipher_unmap_dst(walk); | |
61ecdb80 | 95 | blkcipher_unmap_src(walk); |
5cde0af2 HX |
96 | } |
97 | ||
98 | scatterwalk_advance(&walk->in, n); | |
99 | scatterwalk_advance(&walk->out, n); | |
100 | ||
101 | return n; | |
102 | } | |
103 | ||
104 | int blkcipher_walk_done(struct blkcipher_desc *desc, | |
105 | struct blkcipher_walk *walk, int err) | |
106 | { | |
5cde0af2 HX |
107 | unsigned int nbytes = 0; |
108 | ||
109 | if (likely(err >= 0)) { | |
7607bd8f | 110 | unsigned int n = walk->nbytes - err; |
5cde0af2 HX |
111 | |
112 | if (likely(!(walk->flags & BLKCIPHER_WALK_SLOW))) | |
7607bd8f HX |
113 | n = blkcipher_done_fast(walk, n); |
114 | else if (WARN_ON(err)) { | |
115 | err = -EINVAL; | |
116 | goto err; | |
117 | } else | |
822be00f | 118 | n = blkcipher_done_slow(walk, n); |
5cde0af2 HX |
119 | |
120 | nbytes = walk->total - n; | |
121 | err = 0; | |
122 | } | |
123 | ||
124 | scatterwalk_done(&walk->in, 0, nbytes); | |
125 | scatterwalk_done(&walk->out, 1, nbytes); | |
126 | ||
bac1b5c4 | 127 | err: |
5cde0af2 HX |
128 | walk->total = nbytes; |
129 | walk->nbytes = nbytes; | |
130 | ||
131 | if (nbytes) { | |
132 | crypto_yield(desc->flags); | |
133 | return blkcipher_walk_next(desc, walk); | |
134 | } | |
135 | ||
136 | if (walk->iv != desc->info) | |
822be00f | 137 | memcpy(desc->info, walk->iv, walk->ivsize); |
5cde0af2 HX |
138 | if (walk->buffer != walk->page) |
139 | kfree(walk->buffer); | |
140 | if (walk->page) | |
141 | free_page((unsigned long)walk->page); | |
142 | ||
143 | return err; | |
144 | } | |
145 | EXPORT_SYMBOL_GPL(blkcipher_walk_done); | |
146 | ||
147 | static inline int blkcipher_next_slow(struct blkcipher_desc *desc, | |
148 | struct blkcipher_walk *walk, | |
149 | unsigned int bsize, | |
150 | unsigned int alignmask) | |
151 | { | |
152 | unsigned int n; | |
70613783 | 153 | unsigned aligned_bsize = ALIGN(bsize, alignmask + 1); |
5cde0af2 HX |
154 | |
155 | if (walk->buffer) | |
156 | goto ok; | |
157 | ||
158 | walk->buffer = walk->page; | |
159 | if (walk->buffer) | |
160 | goto ok; | |
161 | ||
2614de1b | 162 | n = aligned_bsize * 3 - (alignmask + 1) + |
e4630f9f | 163 | (alignmask & ~(crypto_tfm_ctx_alignment() - 1)); |
5cde0af2 HX |
164 | walk->buffer = kmalloc(n, GFP_ATOMIC); |
165 | if (!walk->buffer) | |
166 | return blkcipher_walk_done(desc, walk, -ENOMEM); | |
167 | ||
168 | ok: | |
169 | walk->dst.virt.addr = (u8 *)ALIGN((unsigned long)walk->buffer, | |
170 | alignmask + 1); | |
171 | walk->dst.virt.addr = blkcipher_get_spot(walk->dst.virt.addr, bsize); | |
70613783 HX |
172 | walk->src.virt.addr = blkcipher_get_spot(walk->dst.virt.addr + |
173 | aligned_bsize, bsize); | |
5cde0af2 HX |
174 | |
175 | scatterwalk_copychunks(walk->src.virt.addr, &walk->in, bsize, 0); | |
176 | ||
177 | walk->nbytes = bsize; | |
178 | walk->flags |= BLKCIPHER_WALK_SLOW; | |
179 | ||
180 | return 0; | |
181 | } | |
182 | ||
183 | static inline int blkcipher_next_copy(struct blkcipher_walk *walk) | |
184 | { | |
185 | u8 *tmp = walk->page; | |
186 | ||
187 | blkcipher_map_src(walk); | |
188 | memcpy(tmp, walk->src.virt.addr, walk->nbytes); | |
189 | blkcipher_unmap_src(walk); | |
190 | ||
191 | walk->src.virt.addr = tmp; | |
192 | walk->dst.virt.addr = tmp; | |
193 | ||
194 | return 0; | |
195 | } | |
196 | ||
197 | static inline int blkcipher_next_fast(struct blkcipher_desc *desc, | |
198 | struct blkcipher_walk *walk) | |
199 | { | |
200 | unsigned long diff; | |
201 | ||
202 | walk->src.phys.page = scatterwalk_page(&walk->in); | |
203 | walk->src.phys.offset = offset_in_page(walk->in.offset); | |
204 | walk->dst.phys.page = scatterwalk_page(&walk->out); | |
205 | walk->dst.phys.offset = offset_in_page(walk->out.offset); | |
206 | ||
207 | if (walk->flags & BLKCIPHER_WALK_PHYS) | |
208 | return 0; | |
209 | ||
210 | diff = walk->src.phys.offset - walk->dst.phys.offset; | |
211 | diff |= walk->src.virt.page - walk->dst.virt.page; | |
212 | ||
213 | blkcipher_map_src(walk); | |
214 | walk->dst.virt.addr = walk->src.virt.addr; | |
215 | ||
216 | if (diff) { | |
217 | walk->flags |= BLKCIPHER_WALK_DIFF; | |
218 | blkcipher_map_dst(walk); | |
219 | } | |
220 | ||
221 | return 0; | |
222 | } | |
223 | ||
224 | static int blkcipher_walk_next(struct blkcipher_desc *desc, | |
225 | struct blkcipher_walk *walk) | |
226 | { | |
7607bd8f | 227 | unsigned int bsize; |
5cde0af2 HX |
228 | unsigned int n; |
229 | int err; | |
230 | ||
231 | n = walk->total; | |
822be00f | 232 | if (unlikely(n < walk->cipher_blocksize)) { |
5cde0af2 HX |
233 | desc->flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN; |
234 | return blkcipher_walk_done(desc, walk, -EINVAL); | |
235 | } | |
236 | ||
237 | walk->flags &= ~(BLKCIPHER_WALK_SLOW | BLKCIPHER_WALK_COPY | | |
238 | BLKCIPHER_WALK_DIFF); | |
822be00f AB |
239 | if (!scatterwalk_aligned(&walk->in, walk->alignmask) || |
240 | !scatterwalk_aligned(&walk->out, walk->alignmask)) { | |
5cde0af2 HX |
241 | walk->flags |= BLKCIPHER_WALK_COPY; |
242 | if (!walk->page) { | |
243 | walk->page = (void *)__get_free_page(GFP_ATOMIC); | |
244 | if (!walk->page) | |
245 | n = 0; | |
246 | } | |
247 | } | |
248 | ||
822be00f | 249 | bsize = min(walk->walk_blocksize, n); |
5cde0af2 HX |
250 | n = scatterwalk_clamp(&walk->in, n); |
251 | n = scatterwalk_clamp(&walk->out, n); | |
252 | ||
253 | if (unlikely(n < bsize)) { | |
822be00f | 254 | err = blkcipher_next_slow(desc, walk, bsize, walk->alignmask); |
5cde0af2 HX |
255 | goto set_phys_lowmem; |
256 | } | |
257 | ||
258 | walk->nbytes = n; | |
259 | if (walk->flags & BLKCIPHER_WALK_COPY) { | |
260 | err = blkcipher_next_copy(walk); | |
261 | goto set_phys_lowmem; | |
262 | } | |
263 | ||
264 | return blkcipher_next_fast(desc, walk); | |
265 | ||
266 | set_phys_lowmem: | |
267 | if (walk->flags & BLKCIPHER_WALK_PHYS) { | |
268 | walk->src.phys.page = virt_to_page(walk->src.virt.addr); | |
269 | walk->dst.phys.page = virt_to_page(walk->dst.virt.addr); | |
270 | walk->src.phys.offset &= PAGE_SIZE - 1; | |
271 | walk->dst.phys.offset &= PAGE_SIZE - 1; | |
272 | } | |
273 | return err; | |
274 | } | |
275 | ||
822be00f | 276 | static inline int blkcipher_copy_iv(struct blkcipher_walk *walk) |
5cde0af2 | 277 | { |
822be00f AB |
278 | unsigned bs = walk->walk_blocksize; |
279 | unsigned aligned_bs = ALIGN(bs, walk->alignmask + 1); | |
280 | unsigned int size = aligned_bs * 2 + | |
281 | walk->ivsize + max(aligned_bs, walk->ivsize) - | |
282 | (walk->alignmask + 1); | |
5cde0af2 HX |
283 | u8 *iv; |
284 | ||
822be00f | 285 | size += walk->alignmask & ~(crypto_tfm_ctx_alignment() - 1); |
5cde0af2 HX |
286 | walk->buffer = kmalloc(size, GFP_ATOMIC); |
287 | if (!walk->buffer) | |
288 | return -ENOMEM; | |
289 | ||
822be00f | 290 | iv = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1); |
70613783 HX |
291 | iv = blkcipher_get_spot(iv, bs) + aligned_bs; |
292 | iv = blkcipher_get_spot(iv, bs) + aligned_bs; | |
822be00f | 293 | iv = blkcipher_get_spot(iv, walk->ivsize); |
5cde0af2 | 294 | |
822be00f | 295 | walk->iv = memcpy(iv, walk->iv, walk->ivsize); |
5cde0af2 HX |
296 | return 0; |
297 | } | |
298 | ||
299 | int blkcipher_walk_virt(struct blkcipher_desc *desc, | |
300 | struct blkcipher_walk *walk) | |
301 | { | |
302 | walk->flags &= ~BLKCIPHER_WALK_PHYS; | |
822be00f AB |
303 | walk->walk_blocksize = crypto_blkcipher_blocksize(desc->tfm); |
304 | walk->cipher_blocksize = walk->walk_blocksize; | |
305 | walk->ivsize = crypto_blkcipher_ivsize(desc->tfm); | |
306 | walk->alignmask = crypto_blkcipher_alignmask(desc->tfm); | |
5cde0af2 HX |
307 | return blkcipher_walk_first(desc, walk); |
308 | } | |
309 | EXPORT_SYMBOL_GPL(blkcipher_walk_virt); | |
310 | ||
311 | int blkcipher_walk_phys(struct blkcipher_desc *desc, | |
312 | struct blkcipher_walk *walk) | |
313 | { | |
314 | walk->flags |= BLKCIPHER_WALK_PHYS; | |
822be00f AB |
315 | walk->walk_blocksize = crypto_blkcipher_blocksize(desc->tfm); |
316 | walk->cipher_blocksize = walk->walk_blocksize; | |
317 | walk->ivsize = crypto_blkcipher_ivsize(desc->tfm); | |
318 | walk->alignmask = crypto_blkcipher_alignmask(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 | { | |
fb469840 HX |
326 | if (WARN_ON_ONCE(in_irq())) |
327 | return -EDEADLK; | |
328 | ||
5cde0af2 HX |
329 | walk->nbytes = walk->total; |
330 | if (unlikely(!walk->total)) | |
331 | return 0; | |
332 | ||
333 | walk->buffer = NULL; | |
334 | walk->iv = desc->info; | |
822be00f AB |
335 | if (unlikely(((unsigned long)walk->iv & walk->alignmask))) { |
336 | int err = blkcipher_copy_iv(walk); | |
5cde0af2 HX |
337 | if (err) |
338 | return err; | |
339 | } | |
340 | ||
341 | scatterwalk_start(&walk->in, walk->in.sg); | |
342 | scatterwalk_start(&walk->out, walk->out.sg); | |
343 | walk->page = NULL; | |
344 | ||
345 | return blkcipher_walk_next(desc, walk); | |
346 | } | |
347 | ||
7607bd8f HX |
348 | int blkcipher_walk_virt_block(struct blkcipher_desc *desc, |
349 | struct blkcipher_walk *walk, | |
350 | unsigned int blocksize) | |
351 | { | |
352 | walk->flags &= ~BLKCIPHER_WALK_PHYS; | |
822be00f AB |
353 | walk->walk_blocksize = blocksize; |
354 | walk->cipher_blocksize = crypto_blkcipher_blocksize(desc->tfm); | |
355 | walk->ivsize = crypto_blkcipher_ivsize(desc->tfm); | |
356 | walk->alignmask = crypto_blkcipher_alignmask(desc->tfm); | |
7607bd8f HX |
357 | return blkcipher_walk_first(desc, walk); |
358 | } | |
359 | EXPORT_SYMBOL_GPL(blkcipher_walk_virt_block); | |
360 | ||
4f7f1d7c AB |
361 | int blkcipher_aead_walk_virt_block(struct blkcipher_desc *desc, |
362 | struct blkcipher_walk *walk, | |
363 | struct crypto_aead *tfm, | |
364 | unsigned int blocksize) | |
365 | { | |
366 | walk->flags &= ~BLKCIPHER_WALK_PHYS; | |
367 | walk->walk_blocksize = blocksize; | |
368 | walk->cipher_blocksize = crypto_aead_blocksize(tfm); | |
369 | walk->ivsize = crypto_aead_ivsize(tfm); | |
370 | walk->alignmask = crypto_aead_alignmask(tfm); | |
371 | return blkcipher_walk_first(desc, walk); | |
372 | } | |
373 | EXPORT_SYMBOL_GPL(blkcipher_aead_walk_virt_block); | |
374 | ||
791b4d5f HX |
375 | static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key, |
376 | unsigned int keylen) | |
ca7c3938 SS |
377 | { |
378 | struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher; | |
379 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); | |
380 | int ret; | |
381 | u8 *buffer, *alignbuffer; | |
382 | unsigned long absize; | |
383 | ||
384 | absize = keylen + alignmask; | |
385 | buffer = kmalloc(absize, GFP_ATOMIC); | |
386 | if (!buffer) | |
387 | return -ENOMEM; | |
388 | ||
389 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
390 | memcpy(alignbuffer, key, keylen); | |
391 | ret = cipher->setkey(tfm, alignbuffer, keylen); | |
06817176 | 392 | memset(alignbuffer, 0, keylen); |
ca7c3938 SS |
393 | kfree(buffer); |
394 | return ret; | |
395 | } | |
396 | ||
791b4d5f | 397 | static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) |
5cde0af2 HX |
398 | { |
399 | struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher; | |
ca7c3938 | 400 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); |
5cde0af2 HX |
401 | |
402 | if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) { | |
403 | tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; | |
404 | return -EINVAL; | |
405 | } | |
406 | ||
ca7c3938 SS |
407 | if ((unsigned long)key & alignmask) |
408 | return setkey_unaligned(tfm, key, keylen); | |
409 | ||
5cde0af2 HX |
410 | return cipher->setkey(tfm, key, keylen); |
411 | } | |
412 | ||
32e3983f HX |
413 | static int async_setkey(struct crypto_ablkcipher *tfm, const u8 *key, |
414 | unsigned int keylen) | |
415 | { | |
416 | return setkey(crypto_ablkcipher_tfm(tfm), key, keylen); | |
417 | } | |
418 | ||
419 | static int async_encrypt(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 | ||
430 | return alg->encrypt(&desc, req->dst, req->src, req->nbytes); | |
431 | } | |
432 | ||
433 | static int async_decrypt(struct ablkcipher_request *req) | |
434 | { | |
435 | struct crypto_tfm *tfm = req->base.tfm; | |
436 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; | |
437 | struct blkcipher_desc desc = { | |
438 | .tfm = __crypto_blkcipher_cast(tfm), | |
439 | .info = req->info, | |
440 | .flags = req->base.flags, | |
441 | }; | |
442 | ||
443 | return alg->decrypt(&desc, req->dst, req->src, req->nbytes); | |
444 | } | |
445 | ||
27d2a330 HX |
446 | static unsigned int crypto_blkcipher_ctxsize(struct crypto_alg *alg, u32 type, |
447 | u32 mask) | |
5cde0af2 HX |
448 | { |
449 | struct blkcipher_alg *cipher = &alg->cra_blkcipher; | |
450 | unsigned int len = alg->cra_ctxsize; | |
451 | ||
332f8840 HX |
452 | if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK && |
453 | cipher->ivsize) { | |
5cde0af2 HX |
454 | len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1); |
455 | len += cipher->ivsize; | |
456 | } | |
457 | ||
458 | return len; | |
459 | } | |
460 | ||
32e3983f HX |
461 | static int crypto_init_blkcipher_ops_async(struct crypto_tfm *tfm) |
462 | { | |
463 | struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher; | |
464 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; | |
465 | ||
466 | crt->setkey = async_setkey; | |
467 | crt->encrypt = async_encrypt; | |
468 | crt->decrypt = async_decrypt; | |
b9c55aa4 HX |
469 | if (!alg->ivsize) { |
470 | crt->givencrypt = skcipher_null_givencrypt; | |
471 | crt->givdecrypt = skcipher_null_givdecrypt; | |
472 | } | |
ecfc4329 | 473 | crt->base = __crypto_ablkcipher_cast(tfm); |
32e3983f HX |
474 | crt->ivsize = alg->ivsize; |
475 | ||
476 | return 0; | |
477 | } | |
478 | ||
479 | static int crypto_init_blkcipher_ops_sync(struct crypto_tfm *tfm) | |
5cde0af2 HX |
480 | { |
481 | struct blkcipher_tfm *crt = &tfm->crt_blkcipher; | |
482 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; | |
483 | unsigned long align = crypto_tfm_alg_alignmask(tfm) + 1; | |
484 | unsigned long addr; | |
485 | ||
5cde0af2 HX |
486 | crt->setkey = setkey; |
487 | crt->encrypt = alg->encrypt; | |
488 | crt->decrypt = alg->decrypt; | |
489 | ||
490 | addr = (unsigned long)crypto_tfm_ctx(tfm); | |
491 | addr = ALIGN(addr, align); | |
492 | addr += ALIGN(tfm->__crt_alg->cra_ctxsize, align); | |
493 | crt->iv = (void *)addr; | |
494 | ||
495 | return 0; | |
496 | } | |
497 | ||
32e3983f HX |
498 | static int crypto_init_blkcipher_ops(struct crypto_tfm *tfm, u32 type, u32 mask) |
499 | { | |
500 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; | |
501 | ||
502 | if (alg->ivsize > PAGE_SIZE / 8) | |
503 | return -EINVAL; | |
504 | ||
332f8840 | 505 | if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK) |
32e3983f HX |
506 | return crypto_init_blkcipher_ops_sync(tfm); |
507 | else | |
508 | return crypto_init_blkcipher_ops_async(tfm); | |
509 | } | |
510 | ||
3acc8473 | 511 | #ifdef CONFIG_NET |
50496a1f SK |
512 | static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg) |
513 | { | |
514 | struct crypto_report_blkcipher rblkcipher; | |
515 | ||
9a5467bf MK |
516 | strncpy(rblkcipher.type, "blkcipher", sizeof(rblkcipher.type)); |
517 | strncpy(rblkcipher.geniv, alg->cra_blkcipher.geniv ?: "<default>", | |
518 | sizeof(rblkcipher.geniv)); | |
50496a1f SK |
519 | |
520 | rblkcipher.blocksize = alg->cra_blocksize; | |
521 | rblkcipher.min_keysize = alg->cra_blkcipher.min_keysize; | |
522 | rblkcipher.max_keysize = alg->cra_blkcipher.max_keysize; | |
523 | rblkcipher.ivsize = alg->cra_blkcipher.ivsize; | |
524 | ||
6662df33 DM |
525 | if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER, |
526 | sizeof(struct crypto_report_blkcipher), &rblkcipher)) | |
527 | goto nla_put_failure; | |
50496a1f SK |
528 | return 0; |
529 | ||
530 | nla_put_failure: | |
531 | return -EMSGSIZE; | |
532 | } | |
3acc8473 HX |
533 | #else |
534 | static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg) | |
535 | { | |
536 | return -ENOSYS; | |
537 | } | |
538 | #endif | |
50496a1f | 539 | |
5cde0af2 | 540 | static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg) |
03f5d8ce | 541 | __attribute__ ((unused)); |
5cde0af2 HX |
542 | static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg) |
543 | { | |
544 | seq_printf(m, "type : blkcipher\n"); | |
545 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
546 | seq_printf(m, "min keysize : %u\n", alg->cra_blkcipher.min_keysize); | |
547 | seq_printf(m, "max keysize : %u\n", alg->cra_blkcipher.max_keysize); | |
548 | seq_printf(m, "ivsize : %u\n", alg->cra_blkcipher.ivsize); | |
23508e11 HX |
549 | seq_printf(m, "geniv : %s\n", alg->cra_blkcipher.geniv ?: |
550 | "<default>"); | |
5cde0af2 HX |
551 | } |
552 | ||
553 | const struct crypto_type crypto_blkcipher_type = { | |
554 | .ctxsize = crypto_blkcipher_ctxsize, | |
555 | .init = crypto_init_blkcipher_ops, | |
556 | #ifdef CONFIG_PROC_FS | |
557 | .show = crypto_blkcipher_show, | |
558 | #endif | |
50496a1f | 559 | .report = crypto_blkcipher_report, |
5cde0af2 HX |
560 | }; |
561 | EXPORT_SYMBOL_GPL(crypto_blkcipher_type); | |
562 | ||
ecfc4329 HX |
563 | static int crypto_grab_nivcipher(struct crypto_skcipher_spawn *spawn, |
564 | const char *name, u32 type, u32 mask) | |
565 | { | |
566 | struct crypto_alg *alg; | |
567 | int err; | |
568 | ||
569 | type = crypto_skcipher_type(type); | |
b170a137 | 570 | mask = crypto_skcipher_mask(mask)| CRYPTO_ALG_GENIV; |
ecfc4329 HX |
571 | |
572 | alg = crypto_alg_mod_lookup(name, type, mask); | |
573 | if (IS_ERR(alg)) | |
574 | return PTR_ERR(alg); | |
575 | ||
576 | err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask); | |
577 | crypto_mod_put(alg); | |
578 | return err; | |
579 | } | |
580 | ||
581 | struct crypto_instance *skcipher_geniv_alloc(struct crypto_template *tmpl, | |
582 | struct rtattr **tb, u32 type, | |
583 | u32 mask) | |
584 | { | |
585 | struct { | |
586 | int (*setkey)(struct crypto_ablkcipher *tfm, const u8 *key, | |
587 | unsigned int keylen); | |
588 | int (*encrypt)(struct ablkcipher_request *req); | |
589 | int (*decrypt)(struct ablkcipher_request *req); | |
590 | ||
591 | unsigned int min_keysize; | |
592 | unsigned int max_keysize; | |
593 | unsigned int ivsize; | |
594 | ||
595 | const char *geniv; | |
596 | } balg; | |
597 | const char *name; | |
598 | struct crypto_skcipher_spawn *spawn; | |
599 | struct crypto_attr_type *algt; | |
600 | struct crypto_instance *inst; | |
601 | struct crypto_alg *alg; | |
602 | int err; | |
603 | ||
604 | algt = crypto_get_attr_type(tb); | |
ecfc4329 | 605 | if (IS_ERR(algt)) |
3e8afe35 | 606 | return ERR_CAST(algt); |
ecfc4329 HX |
607 | |
608 | if ((algt->type ^ (CRYPTO_ALG_TYPE_GIVCIPHER | CRYPTO_ALG_GENIV)) & | |
609 | algt->mask) | |
610 | return ERR_PTR(-EINVAL); | |
611 | ||
612 | name = crypto_attr_alg_name(tb[1]); | |
ecfc4329 | 613 | if (IS_ERR(name)) |
3e8afe35 | 614 | return ERR_CAST(name); |
ecfc4329 HX |
615 | |
616 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); | |
617 | if (!inst) | |
618 | return ERR_PTR(-ENOMEM); | |
619 | ||
620 | spawn = crypto_instance_ctx(inst); | |
621 | ||
622 | /* Ignore async algorithms if necessary. */ | |
623 | mask |= crypto_requires_sync(algt->type, algt->mask); | |
624 | ||
625 | crypto_set_skcipher_spawn(spawn, inst); | |
626 | err = crypto_grab_nivcipher(spawn, name, type, mask); | |
627 | if (err) | |
628 | goto err_free_inst; | |
629 | ||
630 | alg = crypto_skcipher_spawn_alg(spawn); | |
631 | ||
632 | if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == | |
633 | CRYPTO_ALG_TYPE_BLKCIPHER) { | |
634 | balg.ivsize = alg->cra_blkcipher.ivsize; | |
635 | balg.min_keysize = alg->cra_blkcipher.min_keysize; | |
636 | balg.max_keysize = alg->cra_blkcipher.max_keysize; | |
637 | ||
638 | balg.setkey = async_setkey; | |
639 | balg.encrypt = async_encrypt; | |
640 | balg.decrypt = async_decrypt; | |
641 | ||
642 | balg.geniv = alg->cra_blkcipher.geniv; | |
643 | } else { | |
644 | balg.ivsize = alg->cra_ablkcipher.ivsize; | |
645 | balg.min_keysize = alg->cra_ablkcipher.min_keysize; | |
646 | balg.max_keysize = alg->cra_ablkcipher.max_keysize; | |
647 | ||
648 | balg.setkey = alg->cra_ablkcipher.setkey; | |
649 | balg.encrypt = alg->cra_ablkcipher.encrypt; | |
650 | balg.decrypt = alg->cra_ablkcipher.decrypt; | |
651 | ||
652 | balg.geniv = alg->cra_ablkcipher.geniv; | |
653 | } | |
654 | ||
655 | err = -EINVAL; | |
656 | if (!balg.ivsize) | |
657 | goto err_drop_alg; | |
658 | ||
659 | /* | |
660 | * This is only true if we're constructing an algorithm with its | |
661 | * default IV generator. For the default generator we elide the | |
662 | * template name and double-check the IV generator. | |
663 | */ | |
664 | if (algt->mask & CRYPTO_ALG_GENIV) { | |
665 | if (!balg.geniv) | |
666 | balg.geniv = crypto_default_geniv(alg); | |
667 | err = -EAGAIN; | |
668 | if (strcmp(tmpl->name, balg.geniv)) | |
669 | goto err_drop_alg; | |
670 | ||
671 | memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); | |
672 | memcpy(inst->alg.cra_driver_name, alg->cra_driver_name, | |
673 | CRYPTO_MAX_ALG_NAME); | |
674 | } else { | |
675 | err = -ENAMETOOLONG; | |
676 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, | |
677 | "%s(%s)", tmpl->name, alg->cra_name) >= | |
678 | CRYPTO_MAX_ALG_NAME) | |
679 | goto err_drop_alg; | |
680 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, | |
681 | "%s(%s)", tmpl->name, alg->cra_driver_name) >= | |
682 | CRYPTO_MAX_ALG_NAME) | |
683 | goto err_drop_alg; | |
684 | } | |
685 | ||
686 | inst->alg.cra_flags = CRYPTO_ALG_TYPE_GIVCIPHER | CRYPTO_ALG_GENIV; | |
687 | inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC; | |
688 | inst->alg.cra_priority = alg->cra_priority; | |
689 | inst->alg.cra_blocksize = alg->cra_blocksize; | |
690 | inst->alg.cra_alignmask = alg->cra_alignmask; | |
691 | inst->alg.cra_type = &crypto_givcipher_type; | |
692 | ||
693 | inst->alg.cra_ablkcipher.ivsize = balg.ivsize; | |
694 | inst->alg.cra_ablkcipher.min_keysize = balg.min_keysize; | |
695 | inst->alg.cra_ablkcipher.max_keysize = balg.max_keysize; | |
696 | inst->alg.cra_ablkcipher.geniv = balg.geniv; | |
697 | ||
698 | inst->alg.cra_ablkcipher.setkey = balg.setkey; | |
699 | inst->alg.cra_ablkcipher.encrypt = balg.encrypt; | |
700 | inst->alg.cra_ablkcipher.decrypt = balg.decrypt; | |
701 | ||
702 | out: | |
703 | return inst; | |
704 | ||
705 | err_drop_alg: | |
706 | crypto_drop_skcipher(spawn); | |
707 | err_free_inst: | |
708 | kfree(inst); | |
709 | inst = ERR_PTR(err); | |
710 | goto out; | |
711 | } | |
712 | EXPORT_SYMBOL_GPL(skcipher_geniv_alloc); | |
713 | ||
714 | void skcipher_geniv_free(struct crypto_instance *inst) | |
715 | { | |
716 | crypto_drop_skcipher(crypto_instance_ctx(inst)); | |
717 | kfree(inst); | |
718 | } | |
719 | EXPORT_SYMBOL_GPL(skcipher_geniv_free); | |
720 | ||
721 | int skcipher_geniv_init(struct crypto_tfm *tfm) | |
722 | { | |
723 | struct crypto_instance *inst = (void *)tfm->__crt_alg; | |
724 | struct crypto_ablkcipher *cipher; | |
725 | ||
726 | cipher = crypto_spawn_skcipher(crypto_instance_ctx(inst)); | |
727 | if (IS_ERR(cipher)) | |
728 | return PTR_ERR(cipher); | |
729 | ||
730 | tfm->crt_ablkcipher.base = cipher; | |
731 | tfm->crt_ablkcipher.reqsize += crypto_ablkcipher_reqsize(cipher); | |
732 | ||
733 | return 0; | |
734 | } | |
735 | EXPORT_SYMBOL_GPL(skcipher_geniv_init); | |
736 | ||
737 | void skcipher_geniv_exit(struct crypto_tfm *tfm) | |
738 | { | |
739 | crypto_free_ablkcipher(tfm->crt_ablkcipher.base); | |
740 | } | |
741 | EXPORT_SYMBOL_GPL(skcipher_geniv_exit); | |
742 | ||
5cde0af2 HX |
743 | MODULE_LICENSE("GPL"); |
744 | MODULE_DESCRIPTION("Generic block chaining cipher type"); |