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> | |
27 | ||
28 | #include "internal.h" | |
5cde0af2 HX |
29 | |
30 | enum { | |
31 | BLKCIPHER_WALK_PHYS = 1 << 0, | |
32 | BLKCIPHER_WALK_SLOW = 1 << 1, | |
33 | BLKCIPHER_WALK_COPY = 1 << 2, | |
34 | BLKCIPHER_WALK_DIFF = 1 << 3, | |
35 | }; | |
36 | ||
37 | static int blkcipher_walk_next(struct blkcipher_desc *desc, | |
38 | struct blkcipher_walk *walk); | |
39 | static int blkcipher_walk_first(struct blkcipher_desc *desc, | |
40 | struct blkcipher_walk *walk); | |
41 | ||
42 | static inline void blkcipher_map_src(struct blkcipher_walk *walk) | |
43 | { | |
44 | walk->src.virt.addr = scatterwalk_map(&walk->in, 0); | |
45 | } | |
46 | ||
47 | static inline void blkcipher_map_dst(struct blkcipher_walk *walk) | |
48 | { | |
49 | walk->dst.virt.addr = scatterwalk_map(&walk->out, 1); | |
50 | } | |
51 | ||
52 | static inline void blkcipher_unmap_src(struct blkcipher_walk *walk) | |
53 | { | |
54 | scatterwalk_unmap(walk->src.virt.addr, 0); | |
55 | } | |
56 | ||
57 | static inline void blkcipher_unmap_dst(struct blkcipher_walk *walk) | |
58 | { | |
59 | scatterwalk_unmap(walk->dst.virt.addr, 1); | |
60 | } | |
61 | ||
e4630f9f HX |
62 | /* Get a spot of the specified length that does not straddle a page. |
63 | * The caller needs to ensure that there is enough space for this operation. | |
64 | */ | |
5cde0af2 HX |
65 | static inline u8 *blkcipher_get_spot(u8 *start, unsigned int len) |
66 | { | |
e4630f9f | 67 | u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK); |
5aaff0c8 | 68 | return max(start, end_page); |
5cde0af2 HX |
69 | } |
70 | ||
71 | static inline unsigned int blkcipher_done_slow(struct crypto_blkcipher *tfm, | |
72 | struct blkcipher_walk *walk, | |
73 | unsigned int bsize) | |
74 | { | |
75 | u8 *addr; | |
76 | unsigned int alignmask = crypto_blkcipher_alignmask(tfm); | |
77 | ||
78 | addr = (u8 *)ALIGN((unsigned long)walk->buffer, alignmask + 1); | |
79 | addr = blkcipher_get_spot(addr, bsize); | |
80 | scatterwalk_copychunks(addr, &walk->out, bsize, 1); | |
81 | return bsize; | |
82 | } | |
83 | ||
84 | static inline unsigned int blkcipher_done_fast(struct blkcipher_walk *walk, | |
85 | unsigned int n) | |
86 | { | |
5cde0af2 HX |
87 | if (walk->flags & BLKCIPHER_WALK_COPY) { |
88 | blkcipher_map_dst(walk); | |
89 | memcpy(walk->dst.virt.addr, walk->page, n); | |
90 | blkcipher_unmap_dst(walk); | |
91 | } else if (!(walk->flags & BLKCIPHER_WALK_PHYS)) { | |
92 | blkcipher_unmap_src(walk); | |
93 | if (walk->flags & BLKCIPHER_WALK_DIFF) | |
94 | blkcipher_unmap_dst(walk); | |
95 | } | |
96 | ||
97 | scatterwalk_advance(&walk->in, n); | |
98 | scatterwalk_advance(&walk->out, n); | |
99 | ||
100 | return n; | |
101 | } | |
102 | ||
103 | int blkcipher_walk_done(struct blkcipher_desc *desc, | |
104 | struct blkcipher_walk *walk, int err) | |
105 | { | |
106 | struct crypto_blkcipher *tfm = desc->tfm; | |
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 | |
118 | n = blkcipher_done_slow(tfm, 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 | ||
127 | walk->total = nbytes; | |
128 | walk->nbytes = nbytes; | |
129 | ||
130 | if (nbytes) { | |
131 | crypto_yield(desc->flags); | |
132 | return blkcipher_walk_next(desc, walk); | |
133 | } | |
134 | ||
7607bd8f | 135 | err: |
5cde0af2 HX |
136 | if (walk->iv != desc->info) |
137 | memcpy(desc->info, walk->iv, crypto_blkcipher_ivsize(tfm)); | |
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 | { | |
227 | struct crypto_blkcipher *tfm = desc->tfm; | |
228 | unsigned int alignmask = crypto_blkcipher_alignmask(tfm); | |
7607bd8f | 229 | unsigned int bsize; |
5cde0af2 HX |
230 | unsigned int n; |
231 | int err; | |
232 | ||
233 | n = walk->total; | |
7607bd8f | 234 | if (unlikely(n < crypto_blkcipher_blocksize(tfm))) { |
5cde0af2 HX |
235 | desc->flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN; |
236 | return blkcipher_walk_done(desc, walk, -EINVAL); | |
237 | } | |
238 | ||
239 | walk->flags &= ~(BLKCIPHER_WALK_SLOW | BLKCIPHER_WALK_COPY | | |
240 | BLKCIPHER_WALK_DIFF); | |
241 | if (!scatterwalk_aligned(&walk->in, alignmask) || | |
242 | !scatterwalk_aligned(&walk->out, alignmask)) { | |
243 | walk->flags |= BLKCIPHER_WALK_COPY; | |
244 | if (!walk->page) { | |
245 | walk->page = (void *)__get_free_page(GFP_ATOMIC); | |
246 | if (!walk->page) | |
247 | n = 0; | |
248 | } | |
249 | } | |
250 | ||
7607bd8f | 251 | bsize = min(walk->blocksize, n); |
5cde0af2 HX |
252 | n = scatterwalk_clamp(&walk->in, n); |
253 | n = scatterwalk_clamp(&walk->out, n); | |
254 | ||
255 | if (unlikely(n < bsize)) { | |
256 | err = blkcipher_next_slow(desc, walk, bsize, alignmask); | |
257 | goto set_phys_lowmem; | |
258 | } | |
259 | ||
260 | walk->nbytes = n; | |
261 | if (walk->flags & BLKCIPHER_WALK_COPY) { | |
262 | err = blkcipher_next_copy(walk); | |
263 | goto set_phys_lowmem; | |
264 | } | |
265 | ||
266 | return blkcipher_next_fast(desc, walk); | |
267 | ||
268 | set_phys_lowmem: | |
269 | if (walk->flags & BLKCIPHER_WALK_PHYS) { | |
270 | walk->src.phys.page = virt_to_page(walk->src.virt.addr); | |
271 | walk->dst.phys.page = virt_to_page(walk->dst.virt.addr); | |
272 | walk->src.phys.offset &= PAGE_SIZE - 1; | |
273 | walk->dst.phys.offset &= PAGE_SIZE - 1; | |
274 | } | |
275 | return err; | |
276 | } | |
277 | ||
278 | static inline int blkcipher_copy_iv(struct blkcipher_walk *walk, | |
279 | struct crypto_blkcipher *tfm, | |
280 | unsigned int alignmask) | |
281 | { | |
7607bd8f | 282 | unsigned bs = walk->blocksize; |
5cde0af2 | 283 | unsigned int ivsize = crypto_blkcipher_ivsize(tfm); |
70613783 HX |
284 | unsigned aligned_bs = ALIGN(bs, alignmask + 1); |
285 | unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) - | |
286 | (alignmask + 1); | |
5cde0af2 HX |
287 | u8 *iv; |
288 | ||
289 | size += alignmask & ~(crypto_tfm_ctx_alignment() - 1); | |
290 | walk->buffer = kmalloc(size, GFP_ATOMIC); | |
291 | if (!walk->buffer) | |
292 | return -ENOMEM; | |
293 | ||
294 | iv = (u8 *)ALIGN((unsigned long)walk->buffer, alignmask + 1); | |
70613783 HX |
295 | iv = blkcipher_get_spot(iv, bs) + aligned_bs; |
296 | iv = blkcipher_get_spot(iv, bs) + aligned_bs; | |
5cde0af2 HX |
297 | iv = blkcipher_get_spot(iv, ivsize); |
298 | ||
299 | walk->iv = memcpy(iv, walk->iv, ivsize); | |
300 | return 0; | |
301 | } | |
302 | ||
303 | int blkcipher_walk_virt(struct blkcipher_desc *desc, | |
304 | struct blkcipher_walk *walk) | |
305 | { | |
306 | walk->flags &= ~BLKCIPHER_WALK_PHYS; | |
7607bd8f | 307 | walk->blocksize = crypto_blkcipher_blocksize(desc->tfm); |
5cde0af2 HX |
308 | return blkcipher_walk_first(desc, walk); |
309 | } | |
310 | EXPORT_SYMBOL_GPL(blkcipher_walk_virt); | |
311 | ||
312 | int blkcipher_walk_phys(struct blkcipher_desc *desc, | |
313 | struct blkcipher_walk *walk) | |
314 | { | |
315 | walk->flags |= BLKCIPHER_WALK_PHYS; | |
7607bd8f | 316 | walk->blocksize = crypto_blkcipher_blocksize(desc->tfm); |
5cde0af2 HX |
317 | return blkcipher_walk_first(desc, walk); |
318 | } | |
319 | EXPORT_SYMBOL_GPL(blkcipher_walk_phys); | |
320 | ||
321 | static int blkcipher_walk_first(struct blkcipher_desc *desc, | |
322 | struct blkcipher_walk *walk) | |
323 | { | |
324 | struct crypto_blkcipher *tfm = desc->tfm; | |
325 | unsigned int alignmask = crypto_blkcipher_alignmask(tfm); | |
326 | ||
fb469840 HX |
327 | if (WARN_ON_ONCE(in_irq())) |
328 | return -EDEADLK; | |
329 | ||
5cde0af2 HX |
330 | walk->nbytes = walk->total; |
331 | if (unlikely(!walk->total)) | |
332 | return 0; | |
333 | ||
334 | walk->buffer = NULL; | |
335 | walk->iv = desc->info; | |
336 | if (unlikely(((unsigned long)walk->iv & alignmask))) { | |
337 | int err = blkcipher_copy_iv(walk, tfm, alignmask); | |
338 | if (err) | |
339 | return err; | |
340 | } | |
341 | ||
342 | scatterwalk_start(&walk->in, walk->in.sg); | |
343 | scatterwalk_start(&walk->out, walk->out.sg); | |
344 | walk->page = NULL; | |
345 | ||
346 | return blkcipher_walk_next(desc, walk); | |
347 | } | |
348 | ||
7607bd8f HX |
349 | int blkcipher_walk_virt_block(struct blkcipher_desc *desc, |
350 | struct blkcipher_walk *walk, | |
351 | unsigned int blocksize) | |
352 | { | |
353 | walk->flags &= ~BLKCIPHER_WALK_PHYS; | |
354 | walk->blocksize = blocksize; | |
355 | return blkcipher_walk_first(desc, walk); | |
356 | } | |
357 | EXPORT_SYMBOL_GPL(blkcipher_walk_virt_block); | |
358 | ||
791b4d5f HX |
359 | static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key, |
360 | unsigned int keylen) | |
ca7c3938 SS |
361 | { |
362 | struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher; | |
363 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); | |
364 | int ret; | |
365 | u8 *buffer, *alignbuffer; | |
366 | unsigned long absize; | |
367 | ||
368 | absize = keylen + alignmask; | |
369 | buffer = kmalloc(absize, GFP_ATOMIC); | |
370 | if (!buffer) | |
371 | return -ENOMEM; | |
372 | ||
373 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
374 | memcpy(alignbuffer, key, keylen); | |
375 | ret = cipher->setkey(tfm, alignbuffer, keylen); | |
06817176 | 376 | memset(alignbuffer, 0, keylen); |
ca7c3938 SS |
377 | kfree(buffer); |
378 | return ret; | |
379 | } | |
380 | ||
791b4d5f | 381 | static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) |
5cde0af2 HX |
382 | { |
383 | struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher; | |
ca7c3938 | 384 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); |
5cde0af2 HX |
385 | |
386 | if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) { | |
387 | tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; | |
388 | return -EINVAL; | |
389 | } | |
390 | ||
ca7c3938 SS |
391 | if ((unsigned long)key & alignmask) |
392 | return setkey_unaligned(tfm, key, keylen); | |
393 | ||
5cde0af2 HX |
394 | return cipher->setkey(tfm, key, keylen); |
395 | } | |
396 | ||
32e3983f HX |
397 | static int async_setkey(struct crypto_ablkcipher *tfm, const u8 *key, |
398 | unsigned int keylen) | |
399 | { | |
400 | return setkey(crypto_ablkcipher_tfm(tfm), key, keylen); | |
401 | } | |
402 | ||
403 | static int async_encrypt(struct ablkcipher_request *req) | |
404 | { | |
405 | struct crypto_tfm *tfm = req->base.tfm; | |
406 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; | |
407 | struct blkcipher_desc desc = { | |
408 | .tfm = __crypto_blkcipher_cast(tfm), | |
409 | .info = req->info, | |
410 | .flags = req->base.flags, | |
411 | }; | |
412 | ||
413 | ||
414 | return alg->encrypt(&desc, req->dst, req->src, req->nbytes); | |
415 | } | |
416 | ||
417 | static int async_decrypt(struct ablkcipher_request *req) | |
418 | { | |
419 | struct crypto_tfm *tfm = req->base.tfm; | |
420 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; | |
421 | struct blkcipher_desc desc = { | |
422 | .tfm = __crypto_blkcipher_cast(tfm), | |
423 | .info = req->info, | |
424 | .flags = req->base.flags, | |
425 | }; | |
426 | ||
427 | return alg->decrypt(&desc, req->dst, req->src, req->nbytes); | |
428 | } | |
429 | ||
27d2a330 HX |
430 | static unsigned int crypto_blkcipher_ctxsize(struct crypto_alg *alg, u32 type, |
431 | u32 mask) | |
5cde0af2 HX |
432 | { |
433 | struct blkcipher_alg *cipher = &alg->cra_blkcipher; | |
434 | unsigned int len = alg->cra_ctxsize; | |
435 | ||
332f8840 HX |
436 | if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK && |
437 | cipher->ivsize) { | |
5cde0af2 HX |
438 | len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1); |
439 | len += cipher->ivsize; | |
440 | } | |
441 | ||
442 | return len; | |
443 | } | |
444 | ||
32e3983f HX |
445 | static int crypto_init_blkcipher_ops_async(struct crypto_tfm *tfm) |
446 | { | |
447 | struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher; | |
448 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; | |
449 | ||
450 | crt->setkey = async_setkey; | |
451 | crt->encrypt = async_encrypt; | |
452 | crt->decrypt = async_decrypt; | |
ecfc4329 | 453 | crt->base = __crypto_ablkcipher_cast(tfm); |
32e3983f HX |
454 | crt->ivsize = alg->ivsize; |
455 | ||
456 | return 0; | |
457 | } | |
458 | ||
459 | static int crypto_init_blkcipher_ops_sync(struct crypto_tfm *tfm) | |
5cde0af2 HX |
460 | { |
461 | struct blkcipher_tfm *crt = &tfm->crt_blkcipher; | |
462 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; | |
463 | unsigned long align = crypto_tfm_alg_alignmask(tfm) + 1; | |
464 | unsigned long addr; | |
465 | ||
5cde0af2 HX |
466 | crt->setkey = setkey; |
467 | crt->encrypt = alg->encrypt; | |
468 | crt->decrypt = alg->decrypt; | |
469 | ||
470 | addr = (unsigned long)crypto_tfm_ctx(tfm); | |
471 | addr = ALIGN(addr, align); | |
472 | addr += ALIGN(tfm->__crt_alg->cra_ctxsize, align); | |
473 | crt->iv = (void *)addr; | |
474 | ||
475 | return 0; | |
476 | } | |
477 | ||
32e3983f HX |
478 | static int crypto_init_blkcipher_ops(struct crypto_tfm *tfm, u32 type, u32 mask) |
479 | { | |
480 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; | |
481 | ||
482 | if (alg->ivsize > PAGE_SIZE / 8) | |
483 | return -EINVAL; | |
484 | ||
332f8840 | 485 | if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK) |
32e3983f HX |
486 | return crypto_init_blkcipher_ops_sync(tfm); |
487 | else | |
488 | return crypto_init_blkcipher_ops_async(tfm); | |
489 | } | |
490 | ||
5cde0af2 | 491 | static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg) |
03f5d8ce | 492 | __attribute__ ((unused)); |
5cde0af2 HX |
493 | static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg) |
494 | { | |
495 | seq_printf(m, "type : blkcipher\n"); | |
496 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
497 | seq_printf(m, "min keysize : %u\n", alg->cra_blkcipher.min_keysize); | |
498 | seq_printf(m, "max keysize : %u\n", alg->cra_blkcipher.max_keysize); | |
499 | seq_printf(m, "ivsize : %u\n", alg->cra_blkcipher.ivsize); | |
23508e11 HX |
500 | seq_printf(m, "geniv : %s\n", alg->cra_blkcipher.geniv ?: |
501 | "<default>"); | |
5cde0af2 HX |
502 | } |
503 | ||
504 | const struct crypto_type crypto_blkcipher_type = { | |
505 | .ctxsize = crypto_blkcipher_ctxsize, | |
506 | .init = crypto_init_blkcipher_ops, | |
507 | #ifdef CONFIG_PROC_FS | |
508 | .show = crypto_blkcipher_show, | |
509 | #endif | |
510 | }; | |
511 | EXPORT_SYMBOL_GPL(crypto_blkcipher_type); | |
512 | ||
ecfc4329 HX |
513 | static int crypto_grab_nivcipher(struct crypto_skcipher_spawn *spawn, |
514 | const char *name, u32 type, u32 mask) | |
515 | { | |
516 | struct crypto_alg *alg; | |
517 | int err; | |
518 | ||
519 | type = crypto_skcipher_type(type); | |
520 | mask = crypto_skcipher_mask(mask) | CRYPTO_ALG_GENIV; | |
521 | ||
522 | alg = crypto_alg_mod_lookup(name, type, mask); | |
523 | if (IS_ERR(alg)) | |
524 | return PTR_ERR(alg); | |
525 | ||
526 | err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask); | |
527 | crypto_mod_put(alg); | |
528 | return err; | |
529 | } | |
530 | ||
531 | struct crypto_instance *skcipher_geniv_alloc(struct crypto_template *tmpl, | |
532 | struct rtattr **tb, u32 type, | |
533 | u32 mask) | |
534 | { | |
535 | struct { | |
536 | int (*setkey)(struct crypto_ablkcipher *tfm, const u8 *key, | |
537 | unsigned int keylen); | |
538 | int (*encrypt)(struct ablkcipher_request *req); | |
539 | int (*decrypt)(struct ablkcipher_request *req); | |
540 | ||
541 | unsigned int min_keysize; | |
542 | unsigned int max_keysize; | |
543 | unsigned int ivsize; | |
544 | ||
545 | const char *geniv; | |
546 | } balg; | |
547 | const char *name; | |
548 | struct crypto_skcipher_spawn *spawn; | |
549 | struct crypto_attr_type *algt; | |
550 | struct crypto_instance *inst; | |
551 | struct crypto_alg *alg; | |
552 | int err; | |
553 | ||
554 | algt = crypto_get_attr_type(tb); | |
555 | err = PTR_ERR(algt); | |
556 | if (IS_ERR(algt)) | |
557 | return ERR_PTR(err); | |
558 | ||
559 | if ((algt->type ^ (CRYPTO_ALG_TYPE_GIVCIPHER | CRYPTO_ALG_GENIV)) & | |
560 | algt->mask) | |
561 | return ERR_PTR(-EINVAL); | |
562 | ||
563 | name = crypto_attr_alg_name(tb[1]); | |
564 | err = PTR_ERR(name); | |
565 | if (IS_ERR(name)) | |
566 | return ERR_PTR(err); | |
567 | ||
568 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); | |
569 | if (!inst) | |
570 | return ERR_PTR(-ENOMEM); | |
571 | ||
572 | spawn = crypto_instance_ctx(inst); | |
573 | ||
574 | /* Ignore async algorithms if necessary. */ | |
575 | mask |= crypto_requires_sync(algt->type, algt->mask); | |
576 | ||
577 | crypto_set_skcipher_spawn(spawn, inst); | |
578 | err = crypto_grab_nivcipher(spawn, name, type, mask); | |
579 | if (err) | |
580 | goto err_free_inst; | |
581 | ||
582 | alg = crypto_skcipher_spawn_alg(spawn); | |
583 | ||
584 | if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == | |
585 | CRYPTO_ALG_TYPE_BLKCIPHER) { | |
586 | balg.ivsize = alg->cra_blkcipher.ivsize; | |
587 | balg.min_keysize = alg->cra_blkcipher.min_keysize; | |
588 | balg.max_keysize = alg->cra_blkcipher.max_keysize; | |
589 | ||
590 | balg.setkey = async_setkey; | |
591 | balg.encrypt = async_encrypt; | |
592 | balg.decrypt = async_decrypt; | |
593 | ||
594 | balg.geniv = alg->cra_blkcipher.geniv; | |
595 | } else { | |
596 | balg.ivsize = alg->cra_ablkcipher.ivsize; | |
597 | balg.min_keysize = alg->cra_ablkcipher.min_keysize; | |
598 | balg.max_keysize = alg->cra_ablkcipher.max_keysize; | |
599 | ||
600 | balg.setkey = alg->cra_ablkcipher.setkey; | |
601 | balg.encrypt = alg->cra_ablkcipher.encrypt; | |
602 | balg.decrypt = alg->cra_ablkcipher.decrypt; | |
603 | ||
604 | balg.geniv = alg->cra_ablkcipher.geniv; | |
605 | } | |
606 | ||
607 | err = -EINVAL; | |
608 | if (!balg.ivsize) | |
609 | goto err_drop_alg; | |
610 | ||
611 | /* | |
612 | * This is only true if we're constructing an algorithm with its | |
613 | * default IV generator. For the default generator we elide the | |
614 | * template name and double-check the IV generator. | |
615 | */ | |
616 | if (algt->mask & CRYPTO_ALG_GENIV) { | |
617 | if (!balg.geniv) | |
618 | balg.geniv = crypto_default_geniv(alg); | |
619 | err = -EAGAIN; | |
620 | if (strcmp(tmpl->name, balg.geniv)) | |
621 | goto err_drop_alg; | |
622 | ||
623 | memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); | |
624 | memcpy(inst->alg.cra_driver_name, alg->cra_driver_name, | |
625 | CRYPTO_MAX_ALG_NAME); | |
626 | } else { | |
627 | err = -ENAMETOOLONG; | |
628 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, | |
629 | "%s(%s)", tmpl->name, alg->cra_name) >= | |
630 | CRYPTO_MAX_ALG_NAME) | |
631 | goto err_drop_alg; | |
632 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, | |
633 | "%s(%s)", tmpl->name, alg->cra_driver_name) >= | |
634 | CRYPTO_MAX_ALG_NAME) | |
635 | goto err_drop_alg; | |
636 | } | |
637 | ||
638 | inst->alg.cra_flags = CRYPTO_ALG_TYPE_GIVCIPHER | CRYPTO_ALG_GENIV; | |
639 | inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC; | |
640 | inst->alg.cra_priority = alg->cra_priority; | |
641 | inst->alg.cra_blocksize = alg->cra_blocksize; | |
642 | inst->alg.cra_alignmask = alg->cra_alignmask; | |
643 | inst->alg.cra_type = &crypto_givcipher_type; | |
644 | ||
645 | inst->alg.cra_ablkcipher.ivsize = balg.ivsize; | |
646 | inst->alg.cra_ablkcipher.min_keysize = balg.min_keysize; | |
647 | inst->alg.cra_ablkcipher.max_keysize = balg.max_keysize; | |
648 | inst->alg.cra_ablkcipher.geniv = balg.geniv; | |
649 | ||
650 | inst->alg.cra_ablkcipher.setkey = balg.setkey; | |
651 | inst->alg.cra_ablkcipher.encrypt = balg.encrypt; | |
652 | inst->alg.cra_ablkcipher.decrypt = balg.decrypt; | |
653 | ||
654 | out: | |
655 | return inst; | |
656 | ||
657 | err_drop_alg: | |
658 | crypto_drop_skcipher(spawn); | |
659 | err_free_inst: | |
660 | kfree(inst); | |
661 | inst = ERR_PTR(err); | |
662 | goto out; | |
663 | } | |
664 | EXPORT_SYMBOL_GPL(skcipher_geniv_alloc); | |
665 | ||
666 | void skcipher_geniv_free(struct crypto_instance *inst) | |
667 | { | |
668 | crypto_drop_skcipher(crypto_instance_ctx(inst)); | |
669 | kfree(inst); | |
670 | } | |
671 | EXPORT_SYMBOL_GPL(skcipher_geniv_free); | |
672 | ||
673 | int skcipher_geniv_init(struct crypto_tfm *tfm) | |
674 | { | |
675 | struct crypto_instance *inst = (void *)tfm->__crt_alg; | |
676 | struct crypto_ablkcipher *cipher; | |
677 | ||
678 | cipher = crypto_spawn_skcipher(crypto_instance_ctx(inst)); | |
679 | if (IS_ERR(cipher)) | |
680 | return PTR_ERR(cipher); | |
681 | ||
682 | tfm->crt_ablkcipher.base = cipher; | |
683 | tfm->crt_ablkcipher.reqsize += crypto_ablkcipher_reqsize(cipher); | |
684 | ||
685 | return 0; | |
686 | } | |
687 | EXPORT_SYMBOL_GPL(skcipher_geniv_init); | |
688 | ||
689 | void skcipher_geniv_exit(struct crypto_tfm *tfm) | |
690 | { | |
691 | crypto_free_ablkcipher(tfm->crt_ablkcipher.base); | |
692 | } | |
693 | EXPORT_SYMBOL_GPL(skcipher_geniv_exit); | |
694 | ||
5cde0af2 HX |
695 | MODULE_LICENSE("GPL"); |
696 | MODULE_DESCRIPTION("Generic block chaining cipher type"); |