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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 | |
17 | #include <crypto/internal/skcipher.h> |
18 | #include <crypto/scatterwalk.h> |
19 | #include <linux/errno.h> |
20 | #include <linux/hardirq.h> |
21 | #include <linux/kernel.h> |
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" |
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 | |
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 | */ |
65 | static inline u8 *blkcipher_get_spot(u8 *start, unsigned int len) |
66 | { |
67 | u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK); |
68 | return max(start, end_page); |
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 | { |
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 | if (walk->flags & BLKCIPHER_WALK_DIFF) |
93 | blkcipher_unmap_dst(walk); |
94 | blkcipher_unmap_src(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)) { |
110 | unsigned int n = walk->nbytes - err; |
111 | |
112 | if (likely(!(walk->flags & BLKCIPHER_WALK_SLOW))) |
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); |
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 | err: |
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) |
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; |
153 | unsigned aligned_bsize = ALIGN(bsize, alignmask + 1); |
154 | |
155 | if (walk->buffer) |
156 | goto ok; |
157 | |
158 | walk->buffer = walk->page; |
159 | if (walk->buffer) |
160 | goto ok; |
161 | |
162 | n = aligned_bsize * 3 - (alignmask + 1) + |
163 | (alignmask & ~(crypto_tfm_ctx_alignment() - 1)); |
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); |
172 | walk->src.virt.addr = blkcipher_get_spot(walk->dst.virt.addr + |
173 | aligned_bsize, bsize); |
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); |
229 | unsigned int bsize; |
230 | unsigned int n; |
231 | int err; |
232 | |
233 | n = walk->total; |
234 | if (unlikely(n < crypto_blkcipher_blocksize(tfm))) { |
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 | |
251 | bsize = min(walk->blocksize, n); |
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 | { |
282 | unsigned bs = walk->blocksize; |
283 | unsigned int ivsize = crypto_blkcipher_ivsize(tfm); |
284 | unsigned aligned_bs = ALIGN(bs, alignmask + 1); |
285 | unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) - |
286 | (alignmask + 1); |
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); |
295 | iv = blkcipher_get_spot(iv, bs) + aligned_bs; |
296 | iv = blkcipher_get_spot(iv, bs) + aligned_bs; |
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; |
307 | walk->blocksize = crypto_blkcipher_blocksize(desc->tfm); |
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; |
316 | walk->blocksize = crypto_blkcipher_blocksize(desc->tfm); |
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 | |
327 | if (WARN_ON_ONCE(in_irq())) |
328 | return -EDEADLK; |
329 | |
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 | |
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 | |
359 | static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key, |
360 | unsigned int keylen) |
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); |
376 | memset(alignbuffer, 0, keylen); |
377 | kfree(buffer); |
378 | return ret; |
379 | } |
380 | |
381 | static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) |
382 | { |
383 | struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher; |
384 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); |
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 | |
391 | if ((unsigned long)key & alignmask) |
392 | return setkey_unaligned(tfm, key, keylen); |
393 | |
394 | return cipher->setkey(tfm, key, keylen); |
395 | } |
396 | |
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 | |
430 | static unsigned int crypto_blkcipher_ctxsize(struct crypto_alg *alg, u32 type, |
431 | u32 mask) |
432 | { |
433 | struct blkcipher_alg *cipher = &alg->cra_blkcipher; |
434 | unsigned int len = alg->cra_ctxsize; |
435 | |
436 | if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK && |
437 | cipher->ivsize) { |
438 | len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1); |
439 | len += cipher->ivsize; |
440 | } |
441 | |
442 | return len; |
443 | } |
444 | |
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; |
453 | if (!alg->ivsize) { |
454 | crt->givencrypt = skcipher_null_givencrypt; |
455 | crt->givdecrypt = skcipher_null_givdecrypt; |
456 | } |
457 | crt->base = __crypto_ablkcipher_cast(tfm); |
458 | crt->ivsize = alg->ivsize; |
459 | |
460 | return 0; |
461 | } |
462 | |
463 | static int crypto_init_blkcipher_ops_sync(struct crypto_tfm *tfm) |
464 | { |
465 | struct blkcipher_tfm *crt = &tfm->crt_blkcipher; |
466 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; |
467 | unsigned long align = crypto_tfm_alg_alignmask(tfm) + 1; |
468 | unsigned long addr; |
469 | |
470 | crt->setkey = setkey; |
471 | crt->encrypt = alg->encrypt; |
472 | crt->decrypt = alg->decrypt; |
473 | |
474 | addr = (unsigned long)crypto_tfm_ctx(tfm); |
475 | addr = ALIGN(addr, align); |
476 | addr += ALIGN(tfm->__crt_alg->cra_ctxsize, align); |
477 | crt->iv = (void *)addr; |
478 | |
479 | return 0; |
480 | } |
481 | |
482 | static int crypto_init_blkcipher_ops(struct crypto_tfm *tfm, u32 type, u32 mask) |
483 | { |
484 | struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; |
485 | |
486 | if (alg->ivsize > PAGE_SIZE / 8) |
487 | return -EINVAL; |
488 | |
489 | if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK) |
490 | return crypto_init_blkcipher_ops_sync(tfm); |
491 | else |
492 | return crypto_init_blkcipher_ops_async(tfm); |
493 | } |
494 | |
495 | static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg) |
496 | __attribute__ ((unused)); |
497 | static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg) |
498 | { |
499 | seq_printf(m, "type : blkcipher\n"); |
500 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); |
501 | seq_printf(m, "min keysize : %u\n", alg->cra_blkcipher.min_keysize); |
502 | seq_printf(m, "max keysize : %u\n", alg->cra_blkcipher.max_keysize); |
503 | seq_printf(m, "ivsize : %u\n", alg->cra_blkcipher.ivsize); |
504 | seq_printf(m, "geniv : %s\n", alg->cra_blkcipher.geniv ?: |
505 | "<default>"); |
506 | } |
507 | |
508 | const struct crypto_type crypto_blkcipher_type = { |
509 | .ctxsize = crypto_blkcipher_ctxsize, |
510 | .init = crypto_init_blkcipher_ops, |
511 | #ifdef CONFIG_PROC_FS |
512 | .show = crypto_blkcipher_show, |
513 | #endif |
514 | }; |
515 | EXPORT_SYMBOL_GPL(crypto_blkcipher_type); |
516 | |
517 | static int crypto_grab_nivcipher(struct crypto_skcipher_spawn *spawn, |
518 | const char *name, u32 type, u32 mask) |
519 | { |
520 | struct crypto_alg *alg; |
521 | int err; |
522 | |
523 | type = crypto_skcipher_type(type); |
524 | mask = crypto_skcipher_mask(mask)| CRYPTO_ALG_GENIV; |
525 | |
526 | alg = crypto_alg_mod_lookup(name, type, mask); |
527 | if (IS_ERR(alg)) |
528 | return PTR_ERR(alg); |
529 | |
530 | err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask); |
531 | crypto_mod_put(alg); |
532 | return err; |
533 | } |
534 | |
535 | struct crypto_instance *skcipher_geniv_alloc(struct crypto_template *tmpl, |
536 | struct rtattr **tb, u32 type, |
537 | u32 mask) |
538 | { |
539 | struct { |
540 | int (*setkey)(struct crypto_ablkcipher *tfm, const u8 *key, |
541 | unsigned int keylen); |
542 | int (*encrypt)(struct ablkcipher_request *req); |
543 | int (*decrypt)(struct ablkcipher_request *req); |
544 | |
545 | unsigned int min_keysize; |
546 | unsigned int max_keysize; |
547 | unsigned int ivsize; |
548 | |
549 | const char *geniv; |
550 | } balg; |
551 | const char *name; |
552 | struct crypto_skcipher_spawn *spawn; |
553 | struct crypto_attr_type *algt; |
554 | struct crypto_instance *inst; |
555 | struct crypto_alg *alg; |
556 | int err; |
557 | |
558 | algt = crypto_get_attr_type(tb); |
559 | err = PTR_ERR(algt); |
560 | if (IS_ERR(algt)) |
561 | return ERR_PTR(err); |
562 | |
563 | if ((algt->type ^ (CRYPTO_ALG_TYPE_GIVCIPHER | CRYPTO_ALG_GENIV)) & |
564 | algt->mask) |
565 | return ERR_PTR(-EINVAL); |
566 | |
567 | name = crypto_attr_alg_name(tb[1]); |
568 | err = PTR_ERR(name); |
569 | if (IS_ERR(name)) |
570 | return ERR_PTR(err); |
571 | |
572 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); |
573 | if (!inst) |
574 | return ERR_PTR(-ENOMEM); |
575 | |
576 | spawn = crypto_instance_ctx(inst); |
577 | |
578 | /* Ignore async algorithms if necessary. */ |
579 | mask |= crypto_requires_sync(algt->type, algt->mask); |
580 | |
581 | crypto_set_skcipher_spawn(spawn, inst); |
582 | err = crypto_grab_nivcipher(spawn, name, type, mask); |
583 | if (err) |
584 | goto err_free_inst; |
585 | |
586 | alg = crypto_skcipher_spawn_alg(spawn); |
587 | |
588 | if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == |
589 | CRYPTO_ALG_TYPE_BLKCIPHER) { |
590 | balg.ivsize = alg->cra_blkcipher.ivsize; |
591 | balg.min_keysize = alg->cra_blkcipher.min_keysize; |
592 | balg.max_keysize = alg->cra_blkcipher.max_keysize; |
593 | |
594 | balg.setkey = async_setkey; |
595 | balg.encrypt = async_encrypt; |
596 | balg.decrypt = async_decrypt; |
597 | |
598 | balg.geniv = alg->cra_blkcipher.geniv; |
599 | } else { |
600 | balg.ivsize = alg->cra_ablkcipher.ivsize; |
601 | balg.min_keysize = alg->cra_ablkcipher.min_keysize; |
602 | balg.max_keysize = alg->cra_ablkcipher.max_keysize; |
603 | |
604 | balg.setkey = alg->cra_ablkcipher.setkey; |
605 | balg.encrypt = alg->cra_ablkcipher.encrypt; |
606 | balg.decrypt = alg->cra_ablkcipher.decrypt; |
607 | |
608 | balg.geniv = alg->cra_ablkcipher.geniv; |
609 | } |
610 | |
611 | err = -EINVAL; |
612 | if (!balg.ivsize) |
613 | goto err_drop_alg; |
614 | |
615 | /* |
616 | * This is only true if we're constructing an algorithm with its |
617 | * default IV generator. For the default generator we elide the |
618 | * template name and double-check the IV generator. |
619 | */ |
620 | if (algt->mask & CRYPTO_ALG_GENIV) { |
621 | if (!balg.geniv) |
622 | balg.geniv = crypto_default_geniv(alg); |
623 | err = -EAGAIN; |
624 | if (strcmp(tmpl->name, balg.geniv)) |
625 | goto err_drop_alg; |
626 | |
627 | memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); |
628 | memcpy(inst->alg.cra_driver_name, alg->cra_driver_name, |
629 | CRYPTO_MAX_ALG_NAME); |
630 | } else { |
631 | err = -ENAMETOOLONG; |
632 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, |
633 | "%s(%s)", tmpl->name, alg->cra_name) >= |
634 | CRYPTO_MAX_ALG_NAME) |
635 | goto err_drop_alg; |
636 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
637 | "%s(%s)", tmpl->name, alg->cra_driver_name) >= |
638 | CRYPTO_MAX_ALG_NAME) |
639 | goto err_drop_alg; |
640 | } |
641 | |
642 | inst->alg.cra_flags = CRYPTO_ALG_TYPE_GIVCIPHER | CRYPTO_ALG_GENIV; |
643 | inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC; |
644 | inst->alg.cra_priority = alg->cra_priority; |
645 | inst->alg.cra_blocksize = alg->cra_blocksize; |
646 | inst->alg.cra_alignmask = alg->cra_alignmask; |
647 | inst->alg.cra_type = &crypto_givcipher_type; |
648 | |
649 | inst->alg.cra_ablkcipher.ivsize = balg.ivsize; |
650 | inst->alg.cra_ablkcipher.min_keysize = balg.min_keysize; |
651 | inst->alg.cra_ablkcipher.max_keysize = balg.max_keysize; |
652 | inst->alg.cra_ablkcipher.geniv = balg.geniv; |
653 | |
654 | inst->alg.cra_ablkcipher.setkey = balg.setkey; |
655 | inst->alg.cra_ablkcipher.encrypt = balg.encrypt; |
656 | inst->alg.cra_ablkcipher.decrypt = balg.decrypt; |
657 | |
658 | out: |
659 | return inst; |
660 | |
661 | err_drop_alg: |
662 | crypto_drop_skcipher(spawn); |
663 | err_free_inst: |
664 | kfree(inst); |
665 | inst = ERR_PTR(err); |
666 | goto out; |
667 | } |
668 | EXPORT_SYMBOL_GPL(skcipher_geniv_alloc); |
669 | |
670 | void skcipher_geniv_free(struct crypto_instance *inst) |
671 | { |
672 | crypto_drop_skcipher(crypto_instance_ctx(inst)); |
673 | kfree(inst); |
674 | } |
675 | EXPORT_SYMBOL_GPL(skcipher_geniv_free); |
676 | |
677 | int skcipher_geniv_init(struct crypto_tfm *tfm) |
678 | { |
679 | struct crypto_instance *inst = (void *)tfm->__crt_alg; |
680 | struct crypto_ablkcipher *cipher; |
681 | |
682 | cipher = crypto_spawn_skcipher(crypto_instance_ctx(inst)); |
683 | if (IS_ERR(cipher)) |
684 | return PTR_ERR(cipher); |
685 | |
686 | tfm->crt_ablkcipher.base = cipher; |
687 | tfm->crt_ablkcipher.reqsize += crypto_ablkcipher_reqsize(cipher); |
688 | |
689 | return 0; |
690 | } |
691 | EXPORT_SYMBOL_GPL(skcipher_geniv_init); |
692 | |
693 | void skcipher_geniv_exit(struct crypto_tfm *tfm) |
694 | { |
695 | crypto_free_ablkcipher(tfm->crt_ablkcipher.base); |
696 | } |
697 | EXPORT_SYMBOL_GPL(skcipher_geniv_exit); |
698 | |
699 | MODULE_LICENSE("GPL"); |
700 | MODULE_DESCRIPTION("Generic block chaining cipher type"); |
701 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9