Root/
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 | #include <linux/cryptouser.h> |
28 | #include <net/netlink.h> |
29 | |
30 | #include "internal.h" |
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 | { |
46 | walk->src.virt.addr = scatterwalk_map(&walk->in); |
47 | } |
48 | |
49 | static inline void blkcipher_map_dst(struct blkcipher_walk *walk) |
50 | { |
51 | walk->dst.virt.addr = scatterwalk_map(&walk->out); |
52 | } |
53 | |
54 | static inline void blkcipher_unmap_src(struct blkcipher_walk *walk) |
55 | { |
56 | scatterwalk_unmap(walk->src.virt.addr); |
57 | } |
58 | |
59 | static inline void blkcipher_unmap_dst(struct blkcipher_walk *walk) |
60 | { |
61 | scatterwalk_unmap(walk->dst.virt.addr); |
62 | } |
63 | |
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 | */ |
67 | static inline u8 *blkcipher_get_spot(u8 *start, unsigned int len) |
68 | { |
69 | u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK); |
70 | return max(start, end_page); |
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 | { |
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)) { |
94 | if (walk->flags & BLKCIPHER_WALK_DIFF) |
95 | blkcipher_unmap_dst(walk); |
96 | blkcipher_unmap_src(walk); |
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)) { |
112 | unsigned int n = walk->nbytes - err; |
113 | |
114 | if (likely(!(walk->flags & BLKCIPHER_WALK_SLOW))) |
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); |
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 | |
129 | err: |
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; |
155 | unsigned aligned_bsize = ALIGN(bsize, alignmask + 1); |
156 | |
157 | if (walk->buffer) |
158 | goto ok; |
159 | |
160 | walk->buffer = walk->page; |
161 | if (walk->buffer) |
162 | goto ok; |
163 | |
164 | n = aligned_bsize * 3 - (alignmask + 1) + |
165 | (alignmask & ~(crypto_tfm_ctx_alignment() - 1)); |
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); |
174 | walk->src.virt.addr = blkcipher_get_spot(walk->dst.virt.addr + |
175 | aligned_bsize, bsize); |
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); |
231 | unsigned int bsize; |
232 | unsigned int n; |
233 | int err; |
234 | |
235 | n = walk->total; |
236 | if (unlikely(n < crypto_blkcipher_blocksize(tfm))) { |
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 | |
253 | bsize = min(walk->blocksize, n); |
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 | { |
284 | unsigned bs = walk->blocksize; |
285 | unsigned int ivsize = crypto_blkcipher_ivsize(tfm); |
286 | unsigned aligned_bs = ALIGN(bs, alignmask + 1); |
287 | unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) - |
288 | (alignmask + 1); |
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); |
297 | iv = blkcipher_get_spot(iv, bs) + aligned_bs; |
298 | iv = blkcipher_get_spot(iv, bs) + aligned_bs; |
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; |
309 | walk->blocksize = crypto_blkcipher_blocksize(desc->tfm); |
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; |
318 | walk->blocksize = crypto_blkcipher_blocksize(desc->tfm); |
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 | |
329 | if (WARN_ON_ONCE(in_irq())) |
330 | return -EDEADLK; |
331 | |
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 | |
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 | |
361 | static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key, |
362 | unsigned int keylen) |
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); |
378 | memset(alignbuffer, 0, keylen); |
379 | kfree(buffer); |
380 | return ret; |
381 | } |
382 | |
383 | static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) |
384 | { |
385 | struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher; |
386 | unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); |
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 | |
393 | if ((unsigned long)key & alignmask) |
394 | return setkey_unaligned(tfm, key, keylen); |
395 | |
396 | return cipher->setkey(tfm, key, keylen); |
397 | } |
398 | |
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 | |
432 | static unsigned int crypto_blkcipher_ctxsize(struct crypto_alg *alg, u32 type, |
433 | u32 mask) |
434 | { |
435 | struct blkcipher_alg *cipher = &alg->cra_blkcipher; |
436 | unsigned int len = alg->cra_ctxsize; |
437 | |
438 | if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK && |
439 | cipher->ivsize) { |
440 | len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1); |
441 | len += cipher->ivsize; |
442 | } |
443 | |
444 | return len; |
445 | } |
446 | |
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; |
455 | if (!alg->ivsize) { |
456 | crt->givencrypt = skcipher_null_givencrypt; |
457 | crt->givdecrypt = skcipher_null_givdecrypt; |
458 | } |
459 | crt->base = __crypto_ablkcipher_cast(tfm); |
460 | crt->ivsize = alg->ivsize; |
461 | |
462 | return 0; |
463 | } |
464 | |
465 | static int crypto_init_blkcipher_ops_sync(struct crypto_tfm *tfm) |
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 | |
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 | |
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 | |
491 | if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK) |
492 | return crypto_init_blkcipher_ops_sync(tfm); |
493 | else |
494 | return crypto_init_blkcipher_ops_async(tfm); |
495 | } |
496 | |
497 | #ifdef CONFIG_NET |
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 | |
511 | NLA_PUT(skb, CRYPTOCFGA_REPORT_BLKCIPHER, |
512 | sizeof(struct crypto_report_blkcipher), &rblkcipher); |
513 | |
514 | return 0; |
515 | |
516 | nla_put_failure: |
517 | return -EMSGSIZE; |
518 | } |
519 | #else |
520 | static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg) |
521 | { |
522 | return -ENOSYS; |
523 | } |
524 | #endif |
525 | |
526 | static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg) |
527 | __attribute__ ((unused)); |
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); |
535 | seq_printf(m, "geniv : %s\n", alg->cra_blkcipher.geniv ?: |
536 | "<default>"); |
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 |
545 | .report = crypto_blkcipher_report, |
546 | }; |
547 | EXPORT_SYMBOL_GPL(crypto_blkcipher_type); |
548 | |
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); |
556 | mask = crypto_skcipher_mask(mask)| CRYPTO_ALG_GENIV; |
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 | |
731 | MODULE_LICENSE("GPL"); |
732 | MODULE_DESCRIPTION("Generic block chaining cipher type"); |
733 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9