]>
Commit | Line | Data |
---|---|---|
b5b7f088 HX |
1 | /* |
2 | * Asynchronous block chaining cipher operations. | |
c4ede64a | 3 | * |
b5b7f088 HX |
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 | |
c4ede64a | 11 | * Software Foundation; either version 2 of the License, or (at your option) |
b5b7f088 HX |
12 | * any later version. |
13 | * | |
14 | */ | |
15 | ||
378f4f51 | 16 | #include <crypto/internal/skcipher.h> |
0b67fb65 | 17 | #include <linux/cpumask.h> |
378f4f51 | 18 | #include <linux/err.h> |
791b4d5f | 19 | #include <linux/kernel.h> |
b9c55aa4 HX |
20 | #include <linux/rtnetlink.h> |
21 | #include <linux/sched.h> | |
791b4d5f | 22 | #include <linux/slab.h> |
b5b7f088 | 23 | #include <linux/seq_file.h> |
29ffc876 SK |
24 | #include <linux/cryptouser.h> |
25 | #include <net/netlink.h> | |
b5b7f088 | 26 | |
bf06099d DM |
27 | #include <crypto/scatterwalk.h> |
28 | ||
378f4f51 HX |
29 | #include "internal.h" |
30 | ||
bf06099d DM |
31 | struct ablkcipher_buffer { |
32 | struct list_head entry; | |
33 | struct scatter_walk dst; | |
34 | unsigned int len; | |
35 | void *data; | |
36 | }; | |
37 | ||
38 | enum { | |
39 | ABLKCIPHER_WALK_SLOW = 1 << 0, | |
40 | }; | |
41 | ||
42 | static inline void ablkcipher_buffer_write(struct ablkcipher_buffer *p) | |
43 | { | |
44 | scatterwalk_copychunks(p->data, &p->dst, p->len, 1); | |
45 | } | |
46 | ||
47 | void __ablkcipher_walk_complete(struct ablkcipher_walk *walk) | |
48 | { | |
49 | struct ablkcipher_buffer *p, *tmp; | |
50 | ||
51 | list_for_each_entry_safe(p, tmp, &walk->buffers, entry) { | |
52 | ablkcipher_buffer_write(p); | |
53 | list_del(&p->entry); | |
54 | kfree(p); | |
55 | } | |
56 | } | |
57 | EXPORT_SYMBOL_GPL(__ablkcipher_walk_complete); | |
58 | ||
59 | static inline void ablkcipher_queue_write(struct ablkcipher_walk *walk, | |
60 | struct ablkcipher_buffer *p) | |
61 | { | |
62 | p->dst = walk->out; | |
63 | list_add_tail(&p->entry, &walk->buffers); | |
64 | } | |
65 | ||
66 | /* Get a spot of the specified length that does not straddle a page. | |
67 | * The caller needs to ensure that there is enough space for this operation. | |
68 | */ | |
69 | static inline u8 *ablkcipher_get_spot(u8 *start, unsigned int len) | |
70 | { | |
71 | u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK); | |
a861afbc | 72 | |
bf06099d DM |
73 | return max(start, end_page); |
74 | } | |
75 | ||
76 | static inline unsigned int ablkcipher_done_slow(struct ablkcipher_walk *walk, | |
77 | unsigned int bsize) | |
78 | { | |
79 | unsigned int n = bsize; | |
80 | ||
81 | for (;;) { | |
82 | unsigned int len_this_page = scatterwalk_pagelen(&walk->out); | |
83 | ||
84 | if (len_this_page > n) | |
85 | len_this_page = n; | |
86 | scatterwalk_advance(&walk->out, n); | |
87 | if (n == len_this_page) | |
88 | break; | |
89 | n -= len_this_page; | |
a861afbc JJ |
90 | scatterwalk_start(&walk->out, scatterwalk_sg_next( |
91 | walk->out.sg)); | |
bf06099d DM |
92 | } |
93 | ||
94 | return bsize; | |
95 | } | |
96 | ||
97 | static inline unsigned int ablkcipher_done_fast(struct ablkcipher_walk *walk, | |
98 | unsigned int n) | |
99 | { | |
100 | scatterwalk_advance(&walk->in, n); | |
101 | scatterwalk_advance(&walk->out, n); | |
102 | ||
103 | return n; | |
104 | } | |
105 | ||
106 | static int ablkcipher_walk_next(struct ablkcipher_request *req, | |
107 | struct ablkcipher_walk *walk); | |
108 | ||
109 | int ablkcipher_walk_done(struct ablkcipher_request *req, | |
110 | struct ablkcipher_walk *walk, int err) | |
111 | { | |
112 | struct crypto_tfm *tfm = req->base.tfm; | |
113 | unsigned int nbytes = 0; | |
114 | ||
115 | if (likely(err >= 0)) { | |
116 | unsigned int n = walk->nbytes - err; | |
117 | ||
118 | if (likely(!(walk->flags & ABLKCIPHER_WALK_SLOW))) | |
119 | n = ablkcipher_done_fast(walk, n); | |
120 | else if (WARN_ON(err)) { | |
121 | err = -EINVAL; | |
122 | goto err; | |
123 | } else | |
124 | n = ablkcipher_done_slow(walk, n); | |
125 | ||
126 | nbytes = walk->total - n; | |
127 | err = 0; | |
128 | } | |
129 | ||
130 | scatterwalk_done(&walk->in, 0, nbytes); | |
131 | scatterwalk_done(&walk->out, 1, nbytes); | |
132 | ||
133 | err: | |
134 | walk->total = nbytes; | |
135 | walk->nbytes = nbytes; | |
136 | ||
137 | if (nbytes) { | |
138 | crypto_yield(req->base.flags); | |
139 | return ablkcipher_walk_next(req, walk); | |
140 | } | |
141 | ||
142 | if (walk->iv != req->info) | |
143 | memcpy(req->info, walk->iv, tfm->crt_ablkcipher.ivsize); | |
33c7c0fb | 144 | kfree(walk->iv_buffer); |
bf06099d DM |
145 | |
146 | return err; | |
147 | } | |
148 | EXPORT_SYMBOL_GPL(ablkcipher_walk_done); | |
149 | ||
150 | static inline int ablkcipher_next_slow(struct ablkcipher_request *req, | |
151 | struct ablkcipher_walk *walk, | |
152 | unsigned int bsize, | |
153 | unsigned int alignmask, | |
154 | void **src_p, void **dst_p) | |
155 | { | |
156 | unsigned aligned_bsize = ALIGN(bsize, alignmask + 1); | |
157 | struct ablkcipher_buffer *p; | |
158 | void *src, *dst, *base; | |
159 | unsigned int n; | |
160 | ||
161 | n = ALIGN(sizeof(struct ablkcipher_buffer), alignmask + 1); | |
162 | n += (aligned_bsize * 3 - (alignmask + 1) + | |
163 | (alignmask & ~(crypto_tfm_ctx_alignment() - 1))); | |
164 | ||
165 | p = kmalloc(n, GFP_ATOMIC); | |
166 | if (!p) | |
2716fbf6 | 167 | return ablkcipher_walk_done(req, walk, -ENOMEM); |
bf06099d DM |
168 | |
169 | base = p + 1; | |
170 | ||
171 | dst = (u8 *)ALIGN((unsigned long)base, alignmask + 1); | |
172 | src = dst = ablkcipher_get_spot(dst, bsize); | |
173 | ||
174 | p->len = bsize; | |
175 | p->data = dst; | |
176 | ||
177 | scatterwalk_copychunks(src, &walk->in, bsize, 0); | |
178 | ||
179 | ablkcipher_queue_write(walk, p); | |
180 | ||
181 | walk->nbytes = bsize; | |
182 | walk->flags |= ABLKCIPHER_WALK_SLOW; | |
183 | ||
184 | *src_p = src; | |
185 | *dst_p = dst; | |
186 | ||
187 | return 0; | |
188 | } | |
189 | ||
190 | static inline int ablkcipher_copy_iv(struct ablkcipher_walk *walk, | |
191 | struct crypto_tfm *tfm, | |
192 | unsigned int alignmask) | |
193 | { | |
194 | unsigned bs = walk->blocksize; | |
195 | unsigned int ivsize = tfm->crt_ablkcipher.ivsize; | |
196 | unsigned aligned_bs = ALIGN(bs, alignmask + 1); | |
197 | unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) - | |
198 | (alignmask + 1); | |
199 | u8 *iv; | |
200 | ||
201 | size += alignmask & ~(crypto_tfm_ctx_alignment() - 1); | |
202 | walk->iv_buffer = kmalloc(size, GFP_ATOMIC); | |
203 | if (!walk->iv_buffer) | |
204 | return -ENOMEM; | |
205 | ||
206 | iv = (u8 *)ALIGN((unsigned long)walk->iv_buffer, alignmask + 1); | |
207 | iv = ablkcipher_get_spot(iv, bs) + aligned_bs; | |
208 | iv = ablkcipher_get_spot(iv, bs) + aligned_bs; | |
209 | iv = ablkcipher_get_spot(iv, ivsize); | |
210 | ||
211 | walk->iv = memcpy(iv, walk->iv, ivsize); | |
212 | return 0; | |
213 | } | |
214 | ||
215 | static inline int ablkcipher_next_fast(struct ablkcipher_request *req, | |
216 | struct ablkcipher_walk *walk) | |
217 | { | |
218 | walk->src.page = scatterwalk_page(&walk->in); | |
219 | walk->src.offset = offset_in_page(walk->in.offset); | |
220 | walk->dst.page = scatterwalk_page(&walk->out); | |
221 | walk->dst.offset = offset_in_page(walk->out.offset); | |
222 | ||
223 | return 0; | |
224 | } | |
225 | ||
226 | static int ablkcipher_walk_next(struct ablkcipher_request *req, | |
227 | struct ablkcipher_walk *walk) | |
228 | { | |
229 | struct crypto_tfm *tfm = req->base.tfm; | |
230 | unsigned int alignmask, bsize, n; | |
231 | void *src, *dst; | |
232 | int err; | |
233 | ||
234 | alignmask = crypto_tfm_alg_alignmask(tfm); | |
235 | n = walk->total; | |
236 | if (unlikely(n < crypto_tfm_alg_blocksize(tfm))) { | |
237 | req->base.flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN; | |
238 | return ablkcipher_walk_done(req, walk, -EINVAL); | |
239 | } | |
240 | ||
241 | walk->flags &= ~ABLKCIPHER_WALK_SLOW; | |
242 | src = dst = NULL; | |
243 | ||
244 | bsize = min(walk->blocksize, n); | |
245 | n = scatterwalk_clamp(&walk->in, n); | |
246 | n = scatterwalk_clamp(&walk->out, n); | |
247 | ||
248 | if (n < bsize || | |
249 | !scatterwalk_aligned(&walk->in, alignmask) || | |
250 | !scatterwalk_aligned(&walk->out, alignmask)) { | |
251 | err = ablkcipher_next_slow(req, walk, bsize, alignmask, | |
252 | &src, &dst); | |
253 | goto set_phys_lowmem; | |
254 | } | |
255 | ||
256 | walk->nbytes = n; | |
257 | ||
258 | return ablkcipher_next_fast(req, walk); | |
259 | ||
260 | set_phys_lowmem: | |
261 | if (err >= 0) { | |
262 | walk->src.page = virt_to_page(src); | |
263 | walk->dst.page = virt_to_page(dst); | |
264 | walk->src.offset = ((unsigned long)src & (PAGE_SIZE - 1)); | |
265 | walk->dst.offset = ((unsigned long)dst & (PAGE_SIZE - 1)); | |
266 | } | |
267 | ||
268 | return err; | |
269 | } | |
270 | ||
271 | static int ablkcipher_walk_first(struct ablkcipher_request *req, | |
272 | struct ablkcipher_walk *walk) | |
273 | { | |
274 | struct crypto_tfm *tfm = req->base.tfm; | |
275 | unsigned int alignmask; | |
276 | ||
277 | alignmask = crypto_tfm_alg_alignmask(tfm); | |
278 | if (WARN_ON_ONCE(in_irq())) | |
279 | return -EDEADLK; | |
280 | ||
281 | walk->nbytes = walk->total; | |
282 | if (unlikely(!walk->total)) | |
283 | return 0; | |
284 | ||
285 | walk->iv_buffer = NULL; | |
286 | walk->iv = req->info; | |
287 | if (unlikely(((unsigned long)walk->iv & alignmask))) { | |
288 | int err = ablkcipher_copy_iv(walk, tfm, alignmask); | |
a861afbc | 289 | |
bf06099d DM |
290 | if (err) |
291 | return err; | |
292 | } | |
293 | ||
294 | scatterwalk_start(&walk->in, walk->in.sg); | |
295 | scatterwalk_start(&walk->out, walk->out.sg); | |
296 | ||
297 | return ablkcipher_walk_next(req, walk); | |
298 | } | |
299 | ||
300 | int ablkcipher_walk_phys(struct ablkcipher_request *req, | |
301 | struct ablkcipher_walk *walk) | |
302 | { | |
303 | walk->blocksize = crypto_tfm_alg_blocksize(req->base.tfm); | |
304 | return ablkcipher_walk_first(req, walk); | |
305 | } | |
306 | EXPORT_SYMBOL_GPL(ablkcipher_walk_phys); | |
307 | ||
791b4d5f HX |
308 | static int setkey_unaligned(struct crypto_ablkcipher *tfm, const u8 *key, |
309 | unsigned int keylen) | |
ca7c3938 SS |
310 | { |
311 | struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm); | |
312 | unsigned long alignmask = crypto_ablkcipher_alignmask(tfm); | |
313 | int ret; | |
314 | u8 *buffer, *alignbuffer; | |
315 | unsigned long absize; | |
316 | ||
317 | absize = keylen + alignmask; | |
318 | buffer = kmalloc(absize, GFP_ATOMIC); | |
319 | if (!buffer) | |
320 | return -ENOMEM; | |
321 | ||
322 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
323 | memcpy(alignbuffer, key, keylen); | |
324 | ret = cipher->setkey(tfm, alignbuffer, keylen); | |
06817176 | 325 | memset(alignbuffer, 0, keylen); |
ca7c3938 SS |
326 | kfree(buffer); |
327 | return ret; | |
328 | } | |
329 | ||
b5b7f088 HX |
330 | static int setkey(struct crypto_ablkcipher *tfm, const u8 *key, |
331 | unsigned int keylen) | |
332 | { | |
333 | struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm); | |
ca7c3938 | 334 | unsigned long alignmask = crypto_ablkcipher_alignmask(tfm); |
b5b7f088 HX |
335 | |
336 | if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) { | |
337 | crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); | |
338 | return -EINVAL; | |
339 | } | |
340 | ||
ca7c3938 SS |
341 | if ((unsigned long)key & alignmask) |
342 | return setkey_unaligned(tfm, key, keylen); | |
343 | ||
b5b7f088 HX |
344 | return cipher->setkey(tfm, key, keylen); |
345 | } | |
346 | ||
347 | static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type, | |
348 | u32 mask) | |
349 | { | |
350 | return alg->cra_ctxsize; | |
351 | } | |
352 | ||
b9c55aa4 HX |
353 | int skcipher_null_givencrypt(struct skcipher_givcrypt_request *req) |
354 | { | |
355 | return crypto_ablkcipher_encrypt(&req->creq); | |
356 | } | |
357 | ||
358 | int skcipher_null_givdecrypt(struct skcipher_givcrypt_request *req) | |
359 | { | |
360 | return crypto_ablkcipher_decrypt(&req->creq); | |
361 | } | |
362 | ||
b5b7f088 HX |
363 | static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type, |
364 | u32 mask) | |
365 | { | |
366 | struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher; | |
367 | struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher; | |
368 | ||
369 | if (alg->ivsize > PAGE_SIZE / 8) | |
370 | return -EINVAL; | |
371 | ||
372 | crt->setkey = setkey; | |
373 | crt->encrypt = alg->encrypt; | |
374 | crt->decrypt = alg->decrypt; | |
b9c55aa4 HX |
375 | if (!alg->ivsize) { |
376 | crt->givencrypt = skcipher_null_givencrypt; | |
377 | crt->givdecrypt = skcipher_null_givdecrypt; | |
378 | } | |
ecfc4329 | 379 | crt->base = __crypto_ablkcipher_cast(tfm); |
b5b7f088 HX |
380 | crt->ivsize = alg->ivsize; |
381 | ||
382 | return 0; | |
383 | } | |
384 | ||
3acc8473 | 385 | #ifdef CONFIG_NET |
29ffc876 SK |
386 | static int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg) |
387 | { | |
388 | struct crypto_report_blkcipher rblkcipher; | |
389 | ||
9a5467bf MK |
390 | strncpy(rblkcipher.type, "ablkcipher", sizeof(rblkcipher.type)); |
391 | strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<default>", | |
392 | sizeof(rblkcipher.geniv)); | |
29ffc876 SK |
393 | |
394 | rblkcipher.blocksize = alg->cra_blocksize; | |
395 | rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize; | |
396 | rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize; | |
397 | rblkcipher.ivsize = alg->cra_ablkcipher.ivsize; | |
398 | ||
6662df33 DM |
399 | if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER, |
400 | sizeof(struct crypto_report_blkcipher), &rblkcipher)) | |
401 | goto nla_put_failure; | |
29ffc876 SK |
402 | return 0; |
403 | ||
404 | nla_put_failure: | |
405 | return -EMSGSIZE; | |
406 | } | |
3acc8473 HX |
407 | #else |
408 | static int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg) | |
409 | { | |
410 | return -ENOSYS; | |
411 | } | |
412 | #endif | |
29ffc876 | 413 | |
b5b7f088 HX |
414 | static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg) |
415 | __attribute__ ((unused)); | |
416 | static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg) | |
417 | { | |
418 | struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher; | |
419 | ||
420 | seq_printf(m, "type : ablkcipher\n"); | |
189ed66e HX |
421 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? |
422 | "yes" : "no"); | |
b5b7f088 HX |
423 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); |
424 | seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize); | |
425 | seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize); | |
426 | seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize); | |
23508e11 | 427 | seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<default>"); |
b5b7f088 HX |
428 | } |
429 | ||
430 | const struct crypto_type crypto_ablkcipher_type = { | |
431 | .ctxsize = crypto_ablkcipher_ctxsize, | |
432 | .init = crypto_init_ablkcipher_ops, | |
433 | #ifdef CONFIG_PROC_FS | |
434 | .show = crypto_ablkcipher_show, | |
435 | #endif | |
29ffc876 | 436 | .report = crypto_ablkcipher_report, |
b5b7f088 HX |
437 | }; |
438 | EXPORT_SYMBOL_GPL(crypto_ablkcipher_type); | |
439 | ||
61da88e2 HX |
440 | static int no_givdecrypt(struct skcipher_givcrypt_request *req) |
441 | { | |
442 | return -ENOSYS; | |
443 | } | |
444 | ||
445 | static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type, | |
446 | u32 mask) | |
447 | { | |
448 | struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher; | |
449 | struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher; | |
450 | ||
451 | if (alg->ivsize > PAGE_SIZE / 8) | |
452 | return -EINVAL; | |
453 | ||
ecfc4329 HX |
454 | crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ? |
455 | alg->setkey : setkey; | |
61da88e2 HX |
456 | crt->encrypt = alg->encrypt; |
457 | crt->decrypt = alg->decrypt; | |
458 | crt->givencrypt = alg->givencrypt; | |
459 | crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt; | |
ecfc4329 | 460 | crt->base = __crypto_ablkcipher_cast(tfm); |
61da88e2 HX |
461 | crt->ivsize = alg->ivsize; |
462 | ||
463 | return 0; | |
464 | } | |
465 | ||
3acc8473 | 466 | #ifdef CONFIG_NET |
3e29c109 SK |
467 | static int crypto_givcipher_report(struct sk_buff *skb, struct crypto_alg *alg) |
468 | { | |
469 | struct crypto_report_blkcipher rblkcipher; | |
470 | ||
9a5467bf MK |
471 | strncpy(rblkcipher.type, "givcipher", sizeof(rblkcipher.type)); |
472 | strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<built-in>", | |
473 | sizeof(rblkcipher.geniv)); | |
3e29c109 SK |
474 | |
475 | rblkcipher.blocksize = alg->cra_blocksize; | |
476 | rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize; | |
477 | rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize; | |
478 | rblkcipher.ivsize = alg->cra_ablkcipher.ivsize; | |
479 | ||
6662df33 DM |
480 | if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER, |
481 | sizeof(struct crypto_report_blkcipher), &rblkcipher)) | |
482 | goto nla_put_failure; | |
3e29c109 SK |
483 | return 0; |
484 | ||
485 | nla_put_failure: | |
486 | return -EMSGSIZE; | |
487 | } | |
3acc8473 HX |
488 | #else |
489 | static int crypto_givcipher_report(struct sk_buff *skb, struct crypto_alg *alg) | |
490 | { | |
491 | return -ENOSYS; | |
492 | } | |
493 | #endif | |
3e29c109 | 494 | |
61da88e2 HX |
495 | static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg) |
496 | __attribute__ ((unused)); | |
497 | static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg) | |
498 | { | |
499 | struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher; | |
500 | ||
501 | seq_printf(m, "type : givcipher\n"); | |
189ed66e HX |
502 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? |
503 | "yes" : "no"); | |
61da88e2 HX |
504 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); |
505 | seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize); | |
506 | seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize); | |
507 | seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize); | |
23508e11 | 508 | seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<built-in>"); |
61da88e2 HX |
509 | } |
510 | ||
511 | const struct crypto_type crypto_givcipher_type = { | |
512 | .ctxsize = crypto_ablkcipher_ctxsize, | |
513 | .init = crypto_init_givcipher_ops, | |
514 | #ifdef CONFIG_PROC_FS | |
515 | .show = crypto_givcipher_show, | |
516 | #endif | |
3e29c109 | 517 | .report = crypto_givcipher_report, |
61da88e2 HX |
518 | }; |
519 | EXPORT_SYMBOL_GPL(crypto_givcipher_type); | |
520 | ||
ecfc4329 HX |
521 | const char *crypto_default_geniv(const struct crypto_alg *alg) |
522 | { | |
63b5ac28 HX |
523 | if (((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == |
524 | CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize : | |
525 | alg->cra_ablkcipher.ivsize) != | |
526 | alg->cra_blocksize) | |
527 | return "chainiv"; | |
528 | ||
f3d53ed0 | 529 | return "eseqiv"; |
ecfc4329 HX |
530 | } |
531 | ||
b9c55aa4 HX |
532 | static int crypto_givcipher_default(struct crypto_alg *alg, u32 type, u32 mask) |
533 | { | |
534 | struct rtattr *tb[3]; | |
535 | struct { | |
536 | struct rtattr attr; | |
537 | struct crypto_attr_type data; | |
538 | } ptype; | |
539 | struct { | |
540 | struct rtattr attr; | |
541 | struct crypto_attr_alg data; | |
542 | } palg; | |
543 | struct crypto_template *tmpl; | |
544 | struct crypto_instance *inst; | |
545 | struct crypto_alg *larval; | |
546 | const char *geniv; | |
547 | int err; | |
548 | ||
549 | larval = crypto_larval_lookup(alg->cra_driver_name, | |
435578ae | 550 | (type & ~CRYPTO_ALG_TYPE_MASK) | |
b9c55aa4 | 551 | CRYPTO_ALG_TYPE_GIVCIPHER, |
435578ae | 552 | mask | CRYPTO_ALG_TYPE_MASK); |
b9c55aa4 HX |
553 | err = PTR_ERR(larval); |
554 | if (IS_ERR(larval)) | |
555 | goto out; | |
556 | ||
557 | err = -EAGAIN; | |
558 | if (!crypto_is_larval(larval)) | |
559 | goto drop_larval; | |
560 | ||
561 | ptype.attr.rta_len = sizeof(ptype); | |
562 | ptype.attr.rta_type = CRYPTOA_TYPE; | |
563 | ptype.data.type = type | CRYPTO_ALG_GENIV; | |
564 | /* GENIV tells the template that we're making a default geniv. */ | |
565 | ptype.data.mask = mask | CRYPTO_ALG_GENIV; | |
566 | tb[0] = &ptype.attr; | |
567 | ||
568 | palg.attr.rta_len = sizeof(palg); | |
569 | palg.attr.rta_type = CRYPTOA_ALG; | |
570 | /* Must use the exact name to locate ourselves. */ | |
571 | memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME); | |
572 | tb[1] = &palg.attr; | |
573 | ||
574 | tb[2] = NULL; | |
575 | ||
576 | if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == | |
577 | CRYPTO_ALG_TYPE_BLKCIPHER) | |
578 | geniv = alg->cra_blkcipher.geniv; | |
579 | else | |
580 | geniv = alg->cra_ablkcipher.geniv; | |
581 | ||
582 | if (!geniv) | |
583 | geniv = crypto_default_geniv(alg); | |
584 | ||
585 | tmpl = crypto_lookup_template(geniv); | |
586 | err = -ENOENT; | |
587 | if (!tmpl) | |
588 | goto kill_larval; | |
589 | ||
590 | inst = tmpl->alloc(tb); | |
591 | err = PTR_ERR(inst); | |
592 | if (IS_ERR(inst)) | |
593 | goto put_tmpl; | |
594 | ||
a861afbc JJ |
595 | err = crypto_register_instance(tmpl, inst); |
596 | if (err) { | |
b9c55aa4 HX |
597 | tmpl->free(inst); |
598 | goto put_tmpl; | |
599 | } | |
600 | ||
601 | /* Redo the lookup to use the instance we just registered. */ | |
602 | err = -EAGAIN; | |
603 | ||
604 | put_tmpl: | |
605 | crypto_tmpl_put(tmpl); | |
606 | kill_larval: | |
607 | crypto_larval_kill(larval); | |
608 | drop_larval: | |
609 | crypto_mod_put(larval); | |
610 | out: | |
611 | crypto_mod_put(alg); | |
612 | return err; | |
613 | } | |
614 | ||
1e122994 | 615 | struct crypto_alg *crypto_lookup_skcipher(const char *name, u32 type, u32 mask) |
b9c55aa4 HX |
616 | { |
617 | struct crypto_alg *alg; | |
618 | ||
619 | alg = crypto_alg_mod_lookup(name, type, mask); | |
620 | if (IS_ERR(alg)) | |
621 | return alg; | |
622 | ||
623 | if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == | |
624 | CRYPTO_ALG_TYPE_GIVCIPHER) | |
625 | return alg; | |
626 | ||
627 | if (!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == | |
628 | CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize : | |
629 | alg->cra_ablkcipher.ivsize)) | |
630 | return alg; | |
631 | ||
b170a137 HX |
632 | crypto_mod_put(alg); |
633 | alg = crypto_alg_mod_lookup(name, type | CRYPTO_ALG_TESTED, | |
634 | mask & ~CRYPTO_ALG_TESTED); | |
635 | if (IS_ERR(alg)) | |
636 | return alg; | |
637 | ||
638 | if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == | |
639 | CRYPTO_ALG_TYPE_GIVCIPHER) { | |
640 | if ((alg->cra_flags ^ type ^ ~mask) & CRYPTO_ALG_TESTED) { | |
641 | crypto_mod_put(alg); | |
642 | alg = ERR_PTR(-ENOENT); | |
643 | } | |
644 | return alg; | |
645 | } | |
646 | ||
647 | BUG_ON(!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == | |
648 | CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize : | |
649 | alg->cra_ablkcipher.ivsize)); | |
650 | ||
b9c55aa4 HX |
651 | return ERR_PTR(crypto_givcipher_default(alg, type, mask)); |
652 | } | |
1e122994 | 653 | EXPORT_SYMBOL_GPL(crypto_lookup_skcipher); |
b9c55aa4 | 654 | |
378f4f51 HX |
655 | int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name, |
656 | u32 type, u32 mask) | |
657 | { | |
658 | struct crypto_alg *alg; | |
659 | int err; | |
660 | ||
661 | type = crypto_skcipher_type(type); | |
662 | mask = crypto_skcipher_mask(mask); | |
663 | ||
b9c55aa4 | 664 | alg = crypto_lookup_skcipher(name, type, mask); |
378f4f51 HX |
665 | if (IS_ERR(alg)) |
666 | return PTR_ERR(alg); | |
667 | ||
668 | err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask); | |
669 | crypto_mod_put(alg); | |
670 | return err; | |
671 | } | |
672 | EXPORT_SYMBOL_GPL(crypto_grab_skcipher); | |
673 | ||
b9c55aa4 HX |
674 | struct crypto_ablkcipher *crypto_alloc_ablkcipher(const char *alg_name, |
675 | u32 type, u32 mask) | |
676 | { | |
677 | struct crypto_tfm *tfm; | |
678 | int err; | |
679 | ||
680 | type = crypto_skcipher_type(type); | |
681 | mask = crypto_skcipher_mask(mask); | |
682 | ||
683 | for (;;) { | |
684 | struct crypto_alg *alg; | |
685 | ||
686 | alg = crypto_lookup_skcipher(alg_name, type, mask); | |
687 | if (IS_ERR(alg)) { | |
688 | err = PTR_ERR(alg); | |
689 | goto err; | |
690 | } | |
691 | ||
692 | tfm = __crypto_alloc_tfm(alg, type, mask); | |
693 | if (!IS_ERR(tfm)) | |
694 | return __crypto_ablkcipher_cast(tfm); | |
695 | ||
696 | crypto_mod_put(alg); | |
697 | err = PTR_ERR(tfm); | |
698 | ||
699 | err: | |
700 | if (err != -EAGAIN) | |
701 | break; | |
702 | if (signal_pending(current)) { | |
703 | err = -EINTR; | |
704 | break; | |
705 | } | |
706 | } | |
707 | ||
708 | return ERR_PTR(err); | |
709 | } | |
710 | EXPORT_SYMBOL_GPL(crypto_alloc_ablkcipher); |