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1 | /* | |
2 | * Asynchronous block chaining cipher operations. | |
3 | * | |
4 | * This is the asynchronous version of blkcipher.c indicating completion | |
5 | * via a callback. | |
6 | * | |
7 | * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the Free | |
11 | * Software Foundation; either version 2 of the License, or (at your option) | |
12 | * any later version. | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <crypto/internal/skcipher.h> | |
17 | #include <linux/cpumask.h> | |
18 | #include <linux/err.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/rtnetlink.h> | |
23 | #include <linux/sched.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/seq_file.h> | |
26 | #include <linux/cryptouser.h> | |
27 | #include <net/netlink.h> | |
28 | ||
29 | #include <crypto/scatterwalk.h> | |
30 | ||
31 | #include "internal.h" | |
32 | ||
33 | static const char *skcipher_default_geniv __read_mostly; | |
34 | ||
35 | struct ablkcipher_buffer { | |
36 | struct list_head entry; | |
37 | struct scatter_walk dst; | |
38 | unsigned int len; | |
39 | void *data; | |
40 | }; | |
41 | ||
42 | enum { | |
43 | ABLKCIPHER_WALK_SLOW = 1 << 0, | |
44 | }; | |
45 | ||
46 | static inline void ablkcipher_buffer_write(struct ablkcipher_buffer *p) | |
47 | { | |
48 | scatterwalk_copychunks(p->data, &p->dst, p->len, 1); | |
49 | } | |
50 | ||
51 | void __ablkcipher_walk_complete(struct ablkcipher_walk *walk) | |
52 | { | |
53 | struct ablkcipher_buffer *p, *tmp; | |
54 | ||
55 | list_for_each_entry_safe(p, tmp, &walk->buffers, entry) { | |
56 | ablkcipher_buffer_write(p); | |
57 | list_del(&p->entry); | |
58 | kfree(p); | |
59 | } | |
60 | } | |
61 | EXPORT_SYMBOL_GPL(__ablkcipher_walk_complete); | |
62 | ||
63 | static inline void ablkcipher_queue_write(struct ablkcipher_walk *walk, | |
64 | struct ablkcipher_buffer *p) | |
65 | { | |
66 | p->dst = walk->out; | |
67 | list_add_tail(&p->entry, &walk->buffers); | |
68 | } | |
69 | ||
70 | /* Get a spot of the specified length that does not straddle a page. | |
71 | * The caller needs to ensure that there is enough space for this operation. | |
72 | */ | |
73 | static inline u8 *ablkcipher_get_spot(u8 *start, unsigned int len) | |
74 | { | |
75 | u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK); | |
76 | return max(start, end_page); | |
77 | } | |
78 | ||
79 | static inline unsigned int ablkcipher_done_slow(struct ablkcipher_walk *walk, | |
80 | unsigned int bsize) | |
81 | { | |
82 | unsigned int n = bsize; | |
83 | ||
84 | for (;;) { | |
85 | unsigned int len_this_page = scatterwalk_pagelen(&walk->out); | |
86 | ||
87 | if (len_this_page > n) | |
88 | len_this_page = n; | |
89 | scatterwalk_advance(&walk->out, n); | |
90 | if (n == len_this_page) | |
91 | break; | |
92 | n -= len_this_page; | |
93 | scatterwalk_start(&walk->out, scatterwalk_sg_next(walk->out.sg)); | |
94 | } | |
95 | ||
96 | return bsize; | |
97 | } | |
98 | ||
99 | static inline unsigned int ablkcipher_done_fast(struct ablkcipher_walk *walk, | |
100 | unsigned int n) | |
101 | { | |
102 | scatterwalk_advance(&walk->in, n); | |
103 | scatterwalk_advance(&walk->out, n); | |
104 | ||
105 | return n; | |
106 | } | |
107 | ||
108 | static int ablkcipher_walk_next(struct ablkcipher_request *req, | |
109 | struct ablkcipher_walk *walk); | |
110 | ||
111 | int ablkcipher_walk_done(struct ablkcipher_request *req, | |
112 | struct ablkcipher_walk *walk, int err) | |
113 | { | |
114 | struct crypto_tfm *tfm = req->base.tfm; | |
115 | unsigned int nbytes = 0; | |
116 | ||
117 | if (likely(err >= 0)) { | |
118 | unsigned int n = walk->nbytes - err; | |
119 | ||
120 | if (likely(!(walk->flags & ABLKCIPHER_WALK_SLOW))) | |
121 | n = ablkcipher_done_fast(walk, n); | |
122 | else if (WARN_ON(err)) { | |
123 | err = -EINVAL; | |
124 | goto err; | |
125 | } else | |
126 | n = ablkcipher_done_slow(walk, n); | |
127 | ||
128 | nbytes = walk->total - n; | |
129 | err = 0; | |
130 | } | |
131 | ||
132 | scatterwalk_done(&walk->in, 0, nbytes); | |
133 | scatterwalk_done(&walk->out, 1, nbytes); | |
134 | ||
135 | err: | |
136 | walk->total = nbytes; | |
137 | walk->nbytes = nbytes; | |
138 | ||
139 | if (nbytes) { | |
140 | crypto_yield(req->base.flags); | |
141 | return ablkcipher_walk_next(req, walk); | |
142 | } | |
143 | ||
144 | if (walk->iv != req->info) | |
145 | memcpy(req->info, walk->iv, tfm->crt_ablkcipher.ivsize); | |
146 | kfree(walk->iv_buffer); | |
147 | ||
148 | return err; | |
149 | } | |
150 | EXPORT_SYMBOL_GPL(ablkcipher_walk_done); | |
151 | ||
152 | static inline int ablkcipher_next_slow(struct ablkcipher_request *req, | |
153 | struct ablkcipher_walk *walk, | |
154 | unsigned int bsize, | |
155 | unsigned int alignmask, | |
156 | void **src_p, void **dst_p) | |
157 | { | |
158 | unsigned aligned_bsize = ALIGN(bsize, alignmask + 1); | |
159 | struct ablkcipher_buffer *p; | |
160 | void *src, *dst, *base; | |
161 | unsigned int n; | |
162 | ||
163 | n = ALIGN(sizeof(struct ablkcipher_buffer), alignmask + 1); | |
164 | n += (aligned_bsize * 3 - (alignmask + 1) + | |
165 | (alignmask & ~(crypto_tfm_ctx_alignment() - 1))); | |
166 | ||
167 | p = kmalloc(n, GFP_ATOMIC); | |
168 | if (!p) | |
169 | return ablkcipher_walk_done(req, walk, -ENOMEM); | |
170 | ||
171 | base = p + 1; | |
172 | ||
173 | dst = (u8 *)ALIGN((unsigned long)base, alignmask + 1); | |
174 | src = dst = ablkcipher_get_spot(dst, bsize); | |
175 | ||
176 | p->len = bsize; | |
177 | p->data = dst; | |
178 | ||
179 | scatterwalk_copychunks(src, &walk->in, bsize, 0); | |
180 | ||
181 | ablkcipher_queue_write(walk, p); | |
182 | ||
183 | walk->nbytes = bsize; | |
184 | walk->flags |= ABLKCIPHER_WALK_SLOW; | |
185 | ||
186 | *src_p = src; | |
187 | *dst_p = dst; | |
188 | ||
189 | return 0; | |
190 | } | |
191 | ||
192 | static inline int ablkcipher_copy_iv(struct ablkcipher_walk *walk, | |
193 | struct crypto_tfm *tfm, | |
194 | unsigned int alignmask) | |
195 | { | |
196 | unsigned bs = walk->blocksize; | |
197 | unsigned int ivsize = tfm->crt_ablkcipher.ivsize; | |
198 | unsigned aligned_bs = ALIGN(bs, alignmask + 1); | |
199 | unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) - | |
200 | (alignmask + 1); | |
201 | u8 *iv; | |
202 | ||
203 | size += alignmask & ~(crypto_tfm_ctx_alignment() - 1); | |
204 | walk->iv_buffer = kmalloc(size, GFP_ATOMIC); | |
205 | if (!walk->iv_buffer) | |
206 | return -ENOMEM; | |
207 | ||
208 | iv = (u8 *)ALIGN((unsigned long)walk->iv_buffer, alignmask + 1); | |
209 | iv = ablkcipher_get_spot(iv, bs) + aligned_bs; | |
210 | iv = ablkcipher_get_spot(iv, bs) + aligned_bs; | |
211 | iv = ablkcipher_get_spot(iv, ivsize); | |
212 | ||
213 | walk->iv = memcpy(iv, walk->iv, ivsize); | |
214 | return 0; | |
215 | } | |
216 | ||
217 | static inline int ablkcipher_next_fast(struct ablkcipher_request *req, | |
218 | struct ablkcipher_walk *walk) | |
219 | { | |
220 | walk->src.page = scatterwalk_page(&walk->in); | |
221 | walk->src.offset = offset_in_page(walk->in.offset); | |
222 | walk->dst.page = scatterwalk_page(&walk->out); | |
223 | walk->dst.offset = offset_in_page(walk->out.offset); | |
224 | ||
225 | return 0; | |
226 | } | |
227 | ||
228 | static int ablkcipher_walk_next(struct ablkcipher_request *req, | |
229 | struct ablkcipher_walk *walk) | |
230 | { | |
231 | struct crypto_tfm *tfm = req->base.tfm; | |
232 | unsigned int alignmask, bsize, n; | |
233 | void *src, *dst; | |
234 | int err; | |
235 | ||
236 | alignmask = crypto_tfm_alg_alignmask(tfm); | |
237 | n = walk->total; | |
238 | if (unlikely(n < crypto_tfm_alg_blocksize(tfm))) { | |
239 | req->base.flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN; | |
240 | return ablkcipher_walk_done(req, walk, -EINVAL); | |
241 | } | |
242 | ||
243 | walk->flags &= ~ABLKCIPHER_WALK_SLOW; | |
244 | src = dst = NULL; | |
245 | ||
246 | bsize = min(walk->blocksize, n); | |
247 | n = scatterwalk_clamp(&walk->in, n); | |
248 | n = scatterwalk_clamp(&walk->out, n); | |
249 | ||
250 | if (n < bsize || | |
251 | !scatterwalk_aligned(&walk->in, alignmask) || | |
252 | !scatterwalk_aligned(&walk->out, alignmask)) { | |
253 | err = ablkcipher_next_slow(req, walk, bsize, alignmask, | |
254 | &src, &dst); | |
255 | goto set_phys_lowmem; | |
256 | } | |
257 | ||
258 | walk->nbytes = n; | |
259 | ||
260 | return ablkcipher_next_fast(req, walk); | |
261 | ||
262 | set_phys_lowmem: | |
263 | if (err >= 0) { | |
264 | walk->src.page = virt_to_page(src); | |
265 | walk->dst.page = virt_to_page(dst); | |
266 | walk->src.offset = ((unsigned long)src & (PAGE_SIZE - 1)); | |
267 | walk->dst.offset = ((unsigned long)dst & (PAGE_SIZE - 1)); | |
268 | } | |
269 | ||
270 | return err; | |
271 | } | |
272 | ||
273 | static int ablkcipher_walk_first(struct ablkcipher_request *req, | |
274 | struct ablkcipher_walk *walk) | |
275 | { | |
276 | struct crypto_tfm *tfm = req->base.tfm; | |
277 | unsigned int alignmask; | |
278 | ||
279 | alignmask = crypto_tfm_alg_alignmask(tfm); | |
280 | if (WARN_ON_ONCE(in_irq())) | |
281 | return -EDEADLK; | |
282 | ||
283 | walk->nbytes = walk->total; | |
284 | if (unlikely(!walk->total)) | |
285 | return 0; | |
286 | ||
287 | walk->iv_buffer = NULL; | |
288 | walk->iv = req->info; | |
289 | if (unlikely(((unsigned long)walk->iv & alignmask))) { | |
290 | int err = ablkcipher_copy_iv(walk, tfm, alignmask); | |
291 | if (err) | |
292 | return err; | |
293 | } | |
294 | ||
295 | scatterwalk_start(&walk->in, walk->in.sg); | |
296 | scatterwalk_start(&walk->out, walk->out.sg); | |
297 | ||
298 | return ablkcipher_walk_next(req, walk); | |
299 | } | |
300 | ||
301 | int ablkcipher_walk_phys(struct ablkcipher_request *req, | |
302 | struct ablkcipher_walk *walk) | |
303 | { | |
304 | walk->blocksize = crypto_tfm_alg_blocksize(req->base.tfm); | |
305 | return ablkcipher_walk_first(req, walk); | |
306 | } | |
307 | EXPORT_SYMBOL_GPL(ablkcipher_walk_phys); | |
308 | ||
309 | static int setkey_unaligned(struct crypto_ablkcipher *tfm, const u8 *key, | |
310 | unsigned int keylen) | |
311 | { | |
312 | struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm); | |
313 | unsigned long alignmask = crypto_ablkcipher_alignmask(tfm); | |
314 | int ret; | |
315 | u8 *buffer, *alignbuffer; | |
316 | unsigned long absize; | |
317 | ||
318 | absize = keylen + alignmask; | |
319 | buffer = kmalloc(absize, GFP_ATOMIC); | |
320 | if (!buffer) | |
321 | return -ENOMEM; | |
322 | ||
323 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
324 | memcpy(alignbuffer, key, keylen); | |
325 | ret = cipher->setkey(tfm, alignbuffer, keylen); | |
326 | memset(alignbuffer, 0, keylen); | |
327 | kfree(buffer); | |
328 | return ret; | |
329 | } | |
330 | ||
331 | static int setkey(struct crypto_ablkcipher *tfm, const u8 *key, | |
332 | unsigned int keylen) | |
333 | { | |
334 | struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm); | |
335 | unsigned long alignmask = crypto_ablkcipher_alignmask(tfm); | |
336 | ||
337 | if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) { | |
338 | crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); | |
339 | return -EINVAL; | |
340 | } | |
341 | ||
342 | if ((unsigned long)key & alignmask) | |
343 | return setkey_unaligned(tfm, key, keylen); | |
344 | ||
345 | return cipher->setkey(tfm, key, keylen); | |
346 | } | |
347 | ||
348 | static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type, | |
349 | u32 mask) | |
350 | { | |
351 | return alg->cra_ctxsize; | |
352 | } | |
353 | ||
354 | int skcipher_null_givencrypt(struct skcipher_givcrypt_request *req) | |
355 | { | |
356 | return crypto_ablkcipher_encrypt(&req->creq); | |
357 | } | |
358 | ||
359 | int skcipher_null_givdecrypt(struct skcipher_givcrypt_request *req) | |
360 | { | |
361 | return crypto_ablkcipher_decrypt(&req->creq); | |
362 | } | |
363 | ||
364 | static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type, | |
365 | u32 mask) | |
366 | { | |
367 | struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher; | |
368 | struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher; | |
369 | ||
370 | if (alg->ivsize > PAGE_SIZE / 8) | |
371 | return -EINVAL; | |
372 | ||
373 | crt->setkey = setkey; | |
374 | crt->encrypt = alg->encrypt; | |
375 | crt->decrypt = alg->decrypt; | |
376 | if (!alg->ivsize) { | |
377 | crt->givencrypt = skcipher_null_givencrypt; | |
378 | crt->givdecrypt = skcipher_null_givdecrypt; | |
379 | } | |
380 | crt->base = __crypto_ablkcipher_cast(tfm); | |
381 | crt->ivsize = alg->ivsize; | |
382 | ||
383 | return 0; | |
384 | } | |
385 | ||
386 | #ifdef CONFIG_NET | |
387 | static int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg) | |
388 | { | |
389 | struct crypto_report_blkcipher rblkcipher; | |
390 | ||
391 | snprintf(rblkcipher.type, CRYPTO_MAX_ALG_NAME, "%s", "ablkcipher"); | |
392 | snprintf(rblkcipher.geniv, CRYPTO_MAX_ALG_NAME, "%s", | |
393 | alg->cra_ablkcipher.geniv ?: "<default>"); | |
394 | ||
395 | rblkcipher.blocksize = alg->cra_blocksize; | |
396 | rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize; | |
397 | rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize; | |
398 | rblkcipher.ivsize = alg->cra_ablkcipher.ivsize; | |
399 | ||
400 | if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER, | |
401 | sizeof(struct crypto_report_blkcipher), &rblkcipher)) | |
402 | goto nla_put_failure; | |
403 | return 0; | |
404 | ||
405 | nla_put_failure: | |
406 | return -EMSGSIZE; | |
407 | } | |
408 | #else | |
409 | static int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg) | |
410 | { | |
411 | return -ENOSYS; | |
412 | } | |
413 | #endif | |
414 | ||
415 | static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg) | |
416 | __attribute__ ((unused)); | |
417 | static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg) | |
418 | { | |
419 | struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher; | |
420 | ||
421 | seq_printf(m, "type : ablkcipher\n"); | |
422 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? | |
423 | "yes" : "no"); | |
424 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
425 | seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize); | |
426 | seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize); | |
427 | seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize); | |
428 | seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<default>"); | |
429 | } | |
430 | ||
431 | const struct crypto_type crypto_ablkcipher_type = { | |
432 | .ctxsize = crypto_ablkcipher_ctxsize, | |
433 | .init = crypto_init_ablkcipher_ops, | |
434 | #ifdef CONFIG_PROC_FS | |
435 | .show = crypto_ablkcipher_show, | |
436 | #endif | |
437 | .report = crypto_ablkcipher_report, | |
438 | }; | |
439 | EXPORT_SYMBOL_GPL(crypto_ablkcipher_type); | |
440 | ||
441 | static int no_givdecrypt(struct skcipher_givcrypt_request *req) | |
442 | { | |
443 | return -ENOSYS; | |
444 | } | |
445 | ||
446 | static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type, | |
447 | u32 mask) | |
448 | { | |
449 | struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher; | |
450 | struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher; | |
451 | ||
452 | if (alg->ivsize > PAGE_SIZE / 8) | |
453 | return -EINVAL; | |
454 | ||
455 | crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ? | |
456 | alg->setkey : setkey; | |
457 | crt->encrypt = alg->encrypt; | |
458 | crt->decrypt = alg->decrypt; | |
459 | crt->givencrypt = alg->givencrypt; | |
460 | crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt; | |
461 | crt->base = __crypto_ablkcipher_cast(tfm); | |
462 | crt->ivsize = alg->ivsize; | |
463 | ||
464 | return 0; | |
465 | } | |
466 | ||
467 | #ifdef CONFIG_NET | |
468 | static int crypto_givcipher_report(struct sk_buff *skb, struct crypto_alg *alg) | |
469 | { | |
470 | struct crypto_report_blkcipher rblkcipher; | |
471 | ||
472 | snprintf(rblkcipher.type, CRYPTO_MAX_ALG_NAME, "%s", "givcipher"); | |
473 | snprintf(rblkcipher.geniv, CRYPTO_MAX_ALG_NAME, "%s", | |
474 | alg->cra_ablkcipher.geniv ?: "<built-in>"); | |
475 | ||
476 | rblkcipher.blocksize = alg->cra_blocksize; | |
477 | rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize; | |
478 | rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize; | |
479 | rblkcipher.ivsize = alg->cra_ablkcipher.ivsize; | |
480 | ||
481 | if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER, | |
482 | sizeof(struct crypto_report_blkcipher), &rblkcipher)) | |
483 | goto nla_put_failure; | |
484 | return 0; | |
485 | ||
486 | nla_put_failure: | |
487 | return -EMSGSIZE; | |
488 | } | |
489 | #else | |
490 | static int crypto_givcipher_report(struct sk_buff *skb, struct crypto_alg *alg) | |
491 | { | |
492 | return -ENOSYS; | |
493 | } | |
494 | #endif | |
495 | ||
496 | static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg) | |
497 | __attribute__ ((unused)); | |
498 | static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg) | |
499 | { | |
500 | struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher; | |
501 | ||
502 | seq_printf(m, "type : givcipher\n"); | |
503 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? | |
504 | "yes" : "no"); | |
505 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
506 | seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize); | |
507 | seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize); | |
508 | seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize); | |
509 | seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<built-in>"); | |
510 | } | |
511 | ||
512 | const struct crypto_type crypto_givcipher_type = { | |
513 | .ctxsize = crypto_ablkcipher_ctxsize, | |
514 | .init = crypto_init_givcipher_ops, | |
515 | #ifdef CONFIG_PROC_FS | |
516 | .show = crypto_givcipher_show, | |
517 | #endif | |
518 | .report = crypto_givcipher_report, | |
519 | }; | |
520 | EXPORT_SYMBOL_GPL(crypto_givcipher_type); | |
521 | ||
522 | const char *crypto_default_geniv(const struct crypto_alg *alg) | |
523 | { | |
524 | if (((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == | |
525 | CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize : | |
526 | alg->cra_ablkcipher.ivsize) != | |
527 | alg->cra_blocksize) | |
528 | return "chainiv"; | |
529 | ||
530 | return alg->cra_flags & CRYPTO_ALG_ASYNC ? | |
531 | "eseqiv" : skcipher_default_geniv; | |
532 | } | |
533 | ||
534 | static int crypto_givcipher_default(struct crypto_alg *alg, u32 type, u32 mask) | |
535 | { | |
536 | struct rtattr *tb[3]; | |
537 | struct { | |
538 | struct rtattr attr; | |
539 | struct crypto_attr_type data; | |
540 | } ptype; | |
541 | struct { | |
542 | struct rtattr attr; | |
543 | struct crypto_attr_alg data; | |
544 | } palg; | |
545 | struct crypto_template *tmpl; | |
546 | struct crypto_instance *inst; | |
547 | struct crypto_alg *larval; | |
548 | const char *geniv; | |
549 | int err; | |
550 | ||
551 | larval = crypto_larval_lookup(alg->cra_driver_name, | |
552 | (type & ~CRYPTO_ALG_TYPE_MASK) | | |
553 | CRYPTO_ALG_TYPE_GIVCIPHER, | |
554 | mask | CRYPTO_ALG_TYPE_MASK); | |
555 | err = PTR_ERR(larval); | |
556 | if (IS_ERR(larval)) | |
557 | goto out; | |
558 | ||
559 | err = -EAGAIN; | |
560 | if (!crypto_is_larval(larval)) | |
561 | goto drop_larval; | |
562 | ||
563 | ptype.attr.rta_len = sizeof(ptype); | |
564 | ptype.attr.rta_type = CRYPTOA_TYPE; | |
565 | ptype.data.type = type | CRYPTO_ALG_GENIV; | |
566 | /* GENIV tells the template that we're making a default geniv. */ | |
567 | ptype.data.mask = mask | CRYPTO_ALG_GENIV; | |
568 | tb[0] = &ptype.attr; | |
569 | ||
570 | palg.attr.rta_len = sizeof(palg); | |
571 | palg.attr.rta_type = CRYPTOA_ALG; | |
572 | /* Must use the exact name to locate ourselves. */ | |
573 | memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME); | |
574 | tb[1] = &palg.attr; | |
575 | ||
576 | tb[2] = NULL; | |
577 | ||
578 | if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == | |
579 | CRYPTO_ALG_TYPE_BLKCIPHER) | |
580 | geniv = alg->cra_blkcipher.geniv; | |
581 | else | |
582 | geniv = alg->cra_ablkcipher.geniv; | |
583 | ||
584 | if (!geniv) | |
585 | geniv = crypto_default_geniv(alg); | |
586 | ||
587 | tmpl = crypto_lookup_template(geniv); | |
588 | err = -ENOENT; | |
589 | if (!tmpl) | |
590 | goto kill_larval; | |
591 | ||
592 | inst = tmpl->alloc(tb); | |
593 | err = PTR_ERR(inst); | |
594 | if (IS_ERR(inst)) | |
595 | goto put_tmpl; | |
596 | ||
597 | if ((err = crypto_register_instance(tmpl, inst))) { | |
598 | tmpl->free(inst); | |
599 | goto put_tmpl; | |
600 | } | |
601 | ||
602 | /* Redo the lookup to use the instance we just registered. */ | |
603 | err = -EAGAIN; | |
604 | ||
605 | put_tmpl: | |
606 | crypto_tmpl_put(tmpl); | |
607 | kill_larval: | |
608 | crypto_larval_kill(larval); | |
609 | drop_larval: | |
610 | crypto_mod_put(larval); | |
611 | out: | |
612 | crypto_mod_put(alg); | |
613 | return err; | |
614 | } | |
615 | ||
616 | struct crypto_alg *crypto_lookup_skcipher(const char *name, u32 type, u32 mask) | |
617 | { | |
618 | struct crypto_alg *alg; | |
619 | ||
620 | alg = crypto_alg_mod_lookup(name, type, mask); | |
621 | if (IS_ERR(alg)) | |
622 | return alg; | |
623 | ||
624 | if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == | |
625 | CRYPTO_ALG_TYPE_GIVCIPHER) | |
626 | return alg; | |
627 | ||
628 | if (!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == | |
629 | CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize : | |
630 | alg->cra_ablkcipher.ivsize)) | |
631 | return alg; | |
632 | ||
633 | crypto_mod_put(alg); | |
634 | alg = crypto_alg_mod_lookup(name, type | CRYPTO_ALG_TESTED, | |
635 | mask & ~CRYPTO_ALG_TESTED); | |
636 | if (IS_ERR(alg)) | |
637 | return alg; | |
638 | ||
639 | if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == | |
640 | CRYPTO_ALG_TYPE_GIVCIPHER) { | |
641 | if ((alg->cra_flags ^ type ^ ~mask) & CRYPTO_ALG_TESTED) { | |
642 | crypto_mod_put(alg); | |
643 | alg = ERR_PTR(-ENOENT); | |
644 | } | |
645 | return alg; | |
646 | } | |
647 | ||
648 | BUG_ON(!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == | |
649 | CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize : | |
650 | alg->cra_ablkcipher.ivsize)); | |
651 | ||
652 | return ERR_PTR(crypto_givcipher_default(alg, type, mask)); | |
653 | } | |
654 | EXPORT_SYMBOL_GPL(crypto_lookup_skcipher); | |
655 | ||
656 | int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name, | |
657 | u32 type, u32 mask) | |
658 | { | |
659 | struct crypto_alg *alg; | |
660 | int err; | |
661 | ||
662 | type = crypto_skcipher_type(type); | |
663 | mask = crypto_skcipher_mask(mask); | |
664 | ||
665 | alg = crypto_lookup_skcipher(name, type, mask); | |
666 | if (IS_ERR(alg)) | |
667 | return PTR_ERR(alg); | |
668 | ||
669 | err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask); | |
670 | crypto_mod_put(alg); | |
671 | return err; | |
672 | } | |
673 | EXPORT_SYMBOL_GPL(crypto_grab_skcipher); | |
674 | ||
675 | struct crypto_ablkcipher *crypto_alloc_ablkcipher(const char *alg_name, | |
676 | u32 type, u32 mask) | |
677 | { | |
678 | struct crypto_tfm *tfm; | |
679 | int err; | |
680 | ||
681 | type = crypto_skcipher_type(type); | |
682 | mask = crypto_skcipher_mask(mask); | |
683 | ||
684 | for (;;) { | |
685 | struct crypto_alg *alg; | |
686 | ||
687 | alg = crypto_lookup_skcipher(alg_name, type, mask); | |
688 | if (IS_ERR(alg)) { | |
689 | err = PTR_ERR(alg); | |
690 | goto err; | |
691 | } | |
692 | ||
693 | tfm = __crypto_alloc_tfm(alg, type, mask); | |
694 | if (!IS_ERR(tfm)) | |
695 | return __crypto_ablkcipher_cast(tfm); | |
696 | ||
697 | crypto_mod_put(alg); | |
698 | err = PTR_ERR(tfm); | |
699 | ||
700 | err: | |
701 | if (err != -EAGAIN) | |
702 | break; | |
703 | if (signal_pending(current)) { | |
704 | err = -EINTR; | |
705 | break; | |
706 | } | |
707 | } | |
708 | ||
709 | return ERR_PTR(err); | |
710 | } | |
711 | EXPORT_SYMBOL_GPL(crypto_alloc_ablkcipher); | |
712 | ||
713 | static int __init skcipher_module_init(void) | |
714 | { | |
715 | skcipher_default_geniv = num_possible_cpus() > 1 ? | |
716 | "eseqiv" : "chainiv"; | |
717 | return 0; | |
718 | } | |
719 | ||
720 | static void skcipher_module_exit(void) | |
721 | { | |
722 | } | |
723 | ||
724 | module_init(skcipher_module_init); | |
725 | module_exit(skcipher_module_exit); |