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