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8ff59090 HX |
1 | /* |
2 | * algif_skcipher: User-space interface for skcipher algorithms | |
3 | * | |
4 | * This file provides the user-space API for symmetric key ciphers. | |
5 | * | |
6 | * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the Free | |
10 | * Software Foundation; either version 2 of the License, or (at your option) | |
11 | * any later version. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include <crypto/scatterwalk.h> | |
16 | #include <crypto/skcipher.h> | |
17 | #include <crypto/if_alg.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/list.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/net.h> | |
24 | #include <net/sock.h> | |
25 | ||
26 | struct skcipher_sg_list { | |
27 | struct list_head list; | |
28 | ||
29 | int cur; | |
30 | ||
31 | struct scatterlist sg[0]; | |
32 | }; | |
33 | ||
34 | struct skcipher_ctx { | |
35 | struct list_head tsgl; | |
36 | struct af_alg_sgl rsgl; | |
37 | ||
38 | void *iv; | |
39 | ||
40 | struct af_alg_completion completion; | |
41 | ||
42 | unsigned used; | |
43 | ||
44 | unsigned int len; | |
45 | bool more; | |
46 | bool merge; | |
47 | bool enc; | |
48 | ||
49 | struct ablkcipher_request req; | |
50 | }; | |
51 | ||
52 | #define MAX_SGL_ENTS ((PAGE_SIZE - sizeof(struct skcipher_sg_list)) / \ | |
53 | sizeof(struct scatterlist) - 1) | |
54 | ||
55 | static inline bool skcipher_writable(struct sock *sk) | |
56 | { | |
57 | struct alg_sock *ask = alg_sk(sk); | |
58 | struct skcipher_ctx *ctx = ask->private; | |
59 | ||
60 | return ctx->used + PAGE_SIZE <= max_t(int, sk->sk_sndbuf, PAGE_SIZE); | |
61 | } | |
62 | ||
63 | static int skcipher_alloc_sgl(struct sock *sk) | |
64 | { | |
65 | struct alg_sock *ask = alg_sk(sk); | |
66 | struct skcipher_ctx *ctx = ask->private; | |
67 | struct skcipher_sg_list *sgl; | |
68 | struct scatterlist *sg = NULL; | |
69 | ||
70 | sgl = list_entry(ctx->tsgl.prev, struct skcipher_sg_list, list); | |
71 | if (!list_empty(&ctx->tsgl)) | |
72 | sg = sgl->sg; | |
73 | ||
74 | if (!sg || sgl->cur >= MAX_SGL_ENTS) { | |
75 | sgl = sock_kmalloc(sk, sizeof(*sgl) + | |
76 | sizeof(sgl->sg[0]) * (MAX_SGL_ENTS + 1), | |
77 | GFP_KERNEL); | |
78 | if (!sgl) | |
79 | return -ENOMEM; | |
80 | ||
81 | sg_init_table(sgl->sg, MAX_SGL_ENTS + 1); | |
82 | sgl->cur = 0; | |
83 | ||
84 | if (sg) | |
85 | scatterwalk_sg_chain(sg, MAX_SGL_ENTS + 1, sgl->sg); | |
86 | ||
87 | list_add_tail(&sgl->list, &ctx->tsgl); | |
88 | } | |
89 | ||
90 | return 0; | |
91 | } | |
92 | ||
93 | static void skcipher_pull_sgl(struct sock *sk, int used) | |
94 | { | |
95 | struct alg_sock *ask = alg_sk(sk); | |
96 | struct skcipher_ctx *ctx = ask->private; | |
97 | struct skcipher_sg_list *sgl; | |
98 | struct scatterlist *sg; | |
99 | int i; | |
100 | ||
101 | while (!list_empty(&ctx->tsgl)) { | |
102 | sgl = list_first_entry(&ctx->tsgl, struct skcipher_sg_list, | |
103 | list); | |
104 | sg = sgl->sg; | |
105 | ||
106 | for (i = 0; i < sgl->cur; i++) { | |
107 | int plen = min_t(int, used, sg[i].length); | |
108 | ||
109 | if (!sg_page(sg + i)) | |
110 | continue; | |
111 | ||
112 | sg[i].length -= plen; | |
113 | sg[i].offset += plen; | |
114 | ||
115 | used -= plen; | |
116 | ctx->used -= plen; | |
117 | ||
118 | if (sg[i].length) | |
119 | return; | |
120 | ||
121 | put_page(sg_page(sg + i)); | |
122 | sg_assign_page(sg + i, NULL); | |
123 | } | |
124 | ||
125 | list_del(&sgl->list); | |
126 | sock_kfree_s(sk, sgl, | |
127 | sizeof(*sgl) + sizeof(sgl->sg[0]) * | |
128 | (MAX_SGL_ENTS + 1)); | |
129 | } | |
130 | ||
131 | if (!ctx->used) | |
132 | ctx->merge = 0; | |
133 | } | |
134 | ||
135 | static void skcipher_free_sgl(struct sock *sk) | |
136 | { | |
137 | struct alg_sock *ask = alg_sk(sk); | |
138 | struct skcipher_ctx *ctx = ask->private; | |
139 | ||
140 | skcipher_pull_sgl(sk, ctx->used); | |
141 | } | |
142 | ||
143 | static int skcipher_wait_for_wmem(struct sock *sk, unsigned flags) | |
144 | { | |
145 | long timeout; | |
146 | DEFINE_WAIT(wait); | |
147 | int err = -ERESTARTSYS; | |
148 | ||
149 | if (flags & MSG_DONTWAIT) | |
150 | return -EAGAIN; | |
151 | ||
152 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
153 | ||
154 | for (;;) { | |
155 | if (signal_pending(current)) | |
156 | break; | |
157 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
158 | timeout = MAX_SCHEDULE_TIMEOUT; | |
159 | if (sk_wait_event(sk, &timeout, skcipher_writable(sk))) { | |
160 | err = 0; | |
161 | break; | |
162 | } | |
163 | } | |
164 | finish_wait(sk_sleep(sk), &wait); | |
165 | ||
166 | return err; | |
167 | } | |
168 | ||
169 | static void skcipher_wmem_wakeup(struct sock *sk) | |
170 | { | |
171 | struct socket_wq *wq; | |
172 | ||
173 | if (!skcipher_writable(sk)) | |
174 | return; | |
175 | ||
176 | rcu_read_lock(); | |
177 | wq = rcu_dereference(sk->sk_wq); | |
178 | if (wq_has_sleeper(wq)) | |
179 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | | |
180 | POLLRDNORM | | |
181 | POLLRDBAND); | |
182 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); | |
183 | rcu_read_unlock(); | |
184 | } | |
185 | ||
186 | static int skcipher_wait_for_data(struct sock *sk, unsigned flags) | |
187 | { | |
188 | struct alg_sock *ask = alg_sk(sk); | |
189 | struct skcipher_ctx *ctx = ask->private; | |
190 | long timeout; | |
191 | DEFINE_WAIT(wait); | |
192 | int err = -ERESTARTSYS; | |
193 | ||
194 | if (flags & MSG_DONTWAIT) { | |
195 | return -EAGAIN; | |
196 | } | |
197 | ||
198 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
199 | ||
200 | for (;;) { | |
201 | if (signal_pending(current)) | |
202 | break; | |
203 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
204 | timeout = MAX_SCHEDULE_TIMEOUT; | |
205 | if (sk_wait_event(sk, &timeout, ctx->used)) { | |
206 | err = 0; | |
207 | break; | |
208 | } | |
209 | } | |
210 | finish_wait(sk_sleep(sk), &wait); | |
211 | ||
212 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
213 | ||
214 | return err; | |
215 | } | |
216 | ||
217 | static void skcipher_data_wakeup(struct sock *sk) | |
218 | { | |
219 | struct alg_sock *ask = alg_sk(sk); | |
220 | struct skcipher_ctx *ctx = ask->private; | |
221 | struct socket_wq *wq; | |
222 | ||
223 | if (!ctx->used) | |
224 | return; | |
225 | ||
226 | rcu_read_lock(); | |
227 | wq = rcu_dereference(sk->sk_wq); | |
228 | if (wq_has_sleeper(wq)) | |
229 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | | |
230 | POLLRDNORM | | |
231 | POLLRDBAND); | |
232 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); | |
233 | rcu_read_unlock(); | |
234 | } | |
235 | ||
236 | static int skcipher_sendmsg(struct kiocb *unused, struct socket *sock, | |
237 | struct msghdr *msg, size_t size) | |
238 | { | |
239 | struct sock *sk = sock->sk; | |
240 | struct alg_sock *ask = alg_sk(sk); | |
241 | struct skcipher_ctx *ctx = ask->private; | |
242 | struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(&ctx->req); | |
243 | unsigned ivsize = crypto_ablkcipher_ivsize(tfm); | |
244 | struct skcipher_sg_list *sgl; | |
245 | struct af_alg_control con = {}; | |
246 | long copied = 0; | |
247 | bool enc = 0; | |
248 | int limit; | |
249 | int err; | |
250 | int i; | |
251 | ||
252 | if (msg->msg_controllen) { | |
253 | err = af_alg_cmsg_send(msg, &con); | |
254 | if (err) | |
255 | return err; | |
256 | ||
257 | switch (con.op) { | |
258 | case ALG_OP_ENCRYPT: | |
259 | enc = 1; | |
260 | break; | |
261 | case ALG_OP_DECRYPT: | |
262 | enc = 0; | |
263 | break; | |
264 | default: | |
265 | return -EINVAL; | |
266 | } | |
267 | ||
268 | if (con.iv && con.iv->ivlen != ivsize) | |
269 | return -EINVAL; | |
270 | } | |
271 | ||
272 | err = -EINVAL; | |
273 | ||
274 | lock_sock(sk); | |
275 | if (!ctx->more && ctx->used) | |
276 | goto unlock; | |
277 | ||
278 | if (!ctx->used) { | |
279 | ctx->enc = enc; | |
280 | if (con.iv) | |
281 | memcpy(ctx->iv, con.iv->iv, ivsize); | |
282 | } | |
283 | ||
284 | limit = max_t(int, sk->sk_sndbuf, PAGE_SIZE); | |
285 | limit -= ctx->used; | |
286 | ||
287 | while (size) { | |
288 | struct scatterlist *sg; | |
289 | unsigned long len = size; | |
290 | int plen; | |
291 | ||
292 | if (ctx->merge) { | |
293 | sgl = list_entry(ctx->tsgl.prev, | |
294 | struct skcipher_sg_list, list); | |
295 | sg = sgl->sg + sgl->cur - 1; | |
296 | len = min_t(unsigned long, len, | |
297 | PAGE_SIZE - sg->offset - sg->length); | |
298 | ||
299 | err = memcpy_fromiovec(page_address(sg_page(sg)) + | |
300 | sg->offset + sg->length, | |
301 | msg->msg_iov, len); | |
302 | if (err) | |
303 | goto unlock; | |
304 | ||
305 | sg->length += len; | |
306 | ctx->merge = (sg->offset + sg->length) & | |
307 | (PAGE_SIZE - 1); | |
308 | ||
309 | ctx->used += len; | |
310 | copied += len; | |
311 | size -= len; | |
312 | limit -= len; | |
313 | continue; | |
314 | } | |
315 | ||
316 | if (limit < PAGE_SIZE) { | |
317 | err = skcipher_wait_for_wmem(sk, msg->msg_flags); | |
318 | if (err) | |
319 | goto unlock; | |
320 | ||
321 | limit = max_t(int, sk->sk_sndbuf, PAGE_SIZE); | |
322 | limit -= ctx->used; | |
323 | } | |
324 | ||
325 | len = min_t(unsigned long, len, limit); | |
326 | ||
327 | err = skcipher_alloc_sgl(sk); | |
328 | if (err) | |
329 | goto unlock; | |
330 | ||
331 | sgl = list_entry(ctx->tsgl.prev, struct skcipher_sg_list, list); | |
332 | sg = sgl->sg; | |
333 | do { | |
334 | i = sgl->cur; | |
335 | plen = min_t(int, len, PAGE_SIZE); | |
336 | ||
337 | sg_assign_page(sg + i, alloc_page(GFP_KERNEL)); | |
338 | err = -ENOMEM; | |
339 | if (!sg_page(sg + i)) | |
340 | goto unlock; | |
341 | ||
342 | err = memcpy_fromiovec(page_address(sg_page(sg + i)), | |
343 | msg->msg_iov, plen); | |
344 | if (err) { | |
345 | __free_page(sg_page(sg + i)); | |
346 | sg_assign_page(sg + i, NULL); | |
347 | goto unlock; | |
348 | } | |
349 | ||
350 | sg[i].length = plen; | |
351 | len -= plen; | |
352 | ctx->used += plen; | |
353 | copied += plen; | |
354 | size -= plen; | |
355 | limit -= plen; | |
356 | sgl->cur++; | |
357 | } while (len && sgl->cur < MAX_SGL_ENTS); | |
358 | ||
359 | ctx->merge = plen & (PAGE_SIZE - 1); | |
360 | } | |
361 | ||
362 | err = 0; | |
363 | ||
364 | ctx->more = msg->msg_flags & MSG_MORE; | |
365 | if (!ctx->more && !list_empty(&ctx->tsgl)) | |
366 | sgl = list_entry(ctx->tsgl.prev, struct skcipher_sg_list, list); | |
367 | ||
368 | unlock: | |
369 | skcipher_data_wakeup(sk); | |
370 | release_sock(sk); | |
371 | ||
372 | return copied ?: err; | |
373 | } | |
374 | ||
375 | static ssize_t skcipher_sendpage(struct socket *sock, struct page *page, | |
376 | int offset, size_t size, int flags) | |
377 | { | |
378 | struct sock *sk = sock->sk; | |
379 | struct alg_sock *ask = alg_sk(sk); | |
380 | struct skcipher_ctx *ctx = ask->private; | |
381 | struct skcipher_sg_list *sgl; | |
382 | int err = -EINVAL; | |
383 | int limit; | |
384 | ||
385 | lock_sock(sk); | |
386 | if (!ctx->more && ctx->used) | |
387 | goto unlock; | |
388 | ||
389 | if (!size) | |
390 | goto done; | |
391 | ||
392 | limit = max_t(int, sk->sk_sndbuf, PAGE_SIZE); | |
393 | limit -= ctx->used; | |
394 | ||
395 | if (limit < PAGE_SIZE) { | |
396 | err = skcipher_wait_for_wmem(sk, flags); | |
397 | if (err) | |
398 | goto unlock; | |
399 | ||
400 | limit = max_t(int, sk->sk_sndbuf, PAGE_SIZE); | |
401 | limit -= ctx->used; | |
402 | } | |
403 | ||
404 | err = skcipher_alloc_sgl(sk); | |
405 | if (err) | |
406 | goto unlock; | |
407 | ||
408 | ctx->merge = 0; | |
409 | sgl = list_entry(ctx->tsgl.prev, struct skcipher_sg_list, list); | |
410 | ||
411 | get_page(page); | |
412 | sg_set_page(sgl->sg + sgl->cur, page, size, offset); | |
413 | sgl->cur++; | |
414 | ctx->used += size; | |
415 | ||
416 | done: | |
417 | ctx->more = flags & MSG_MORE; | |
418 | if (!ctx->more && !list_empty(&ctx->tsgl)) | |
419 | sgl = list_entry(ctx->tsgl.prev, struct skcipher_sg_list, list); | |
420 | ||
421 | unlock: | |
422 | skcipher_data_wakeup(sk); | |
423 | release_sock(sk); | |
424 | ||
425 | return err ?: size; | |
426 | } | |
427 | ||
428 | static int skcipher_recvmsg(struct kiocb *unused, struct socket *sock, | |
429 | struct msghdr *msg, size_t ignored, int flags) | |
430 | { | |
431 | struct sock *sk = sock->sk; | |
432 | struct alg_sock *ask = alg_sk(sk); | |
433 | struct skcipher_ctx *ctx = ask->private; | |
434 | unsigned bs = crypto_ablkcipher_blocksize(crypto_ablkcipher_reqtfm( | |
435 | &ctx->req)); | |
436 | struct skcipher_sg_list *sgl; | |
437 | struct scatterlist *sg; | |
438 | unsigned long iovlen; | |
439 | struct iovec *iov; | |
440 | int err = -EAGAIN; | |
441 | int used; | |
442 | long copied = 0; | |
443 | ||
444 | lock_sock(sk); | |
445 | for (iov = msg->msg_iov, iovlen = msg->msg_iovlen; iovlen > 0; | |
446 | iovlen--, iov++) { | |
447 | unsigned long seglen = iov->iov_len; | |
448 | char __user *from = iov->iov_base; | |
449 | ||
450 | while (seglen) { | |
451 | sgl = list_first_entry(&ctx->tsgl, | |
452 | struct skcipher_sg_list, list); | |
453 | sg = sgl->sg; | |
454 | ||
455 | while (!sg->length) | |
456 | sg++; | |
457 | ||
458 | used = ctx->used; | |
459 | if (!used) { | |
460 | err = skcipher_wait_for_data(sk, flags); | |
461 | if (err) | |
462 | goto unlock; | |
463 | } | |
464 | ||
465 | used = min_t(unsigned long, used, seglen); | |
466 | ||
467 | if (ctx->more || used < ctx->used) | |
468 | used -= used % bs; | |
469 | ||
470 | err = -EINVAL; | |
471 | if (!used) | |
472 | goto unlock; | |
473 | ||
474 | used = af_alg_make_sg(&ctx->rsgl, from, used, 1); | |
475 | if (used < 0) | |
476 | goto unlock; | |
477 | ||
478 | ablkcipher_request_set_crypt(&ctx->req, sg, | |
479 | ctx->rsgl.sg, used, | |
480 | ctx->iv); | |
481 | ||
482 | err = af_alg_wait_for_completion( | |
483 | ctx->enc ? | |
484 | crypto_ablkcipher_encrypt(&ctx->req) : | |
485 | crypto_ablkcipher_decrypt(&ctx->req), | |
486 | &ctx->completion); | |
487 | ||
488 | af_alg_free_sg(&ctx->rsgl); | |
489 | ||
490 | if (err) | |
491 | goto unlock; | |
492 | ||
493 | copied += used; | |
494 | from += used; | |
495 | seglen -= used; | |
496 | skcipher_pull_sgl(sk, used); | |
497 | } | |
498 | } | |
499 | ||
500 | err = 0; | |
501 | ||
502 | unlock: | |
503 | skcipher_wmem_wakeup(sk); | |
504 | release_sock(sk); | |
505 | ||
506 | return copied ?: err; | |
507 | } | |
508 | ||
509 | ||
510 | static unsigned int skcipher_poll(struct file *file, struct socket *sock, | |
511 | poll_table *wait) | |
512 | { | |
513 | struct sock *sk = sock->sk; | |
514 | struct alg_sock *ask = alg_sk(sk); | |
515 | struct skcipher_ctx *ctx = ask->private; | |
516 | unsigned int mask; | |
517 | ||
518 | sock_poll_wait(file, sk_sleep(sk), wait); | |
519 | mask = 0; | |
520 | ||
521 | if (ctx->used) | |
522 | mask |= POLLIN | POLLRDNORM; | |
523 | ||
524 | if (skcipher_writable(sk)) | |
525 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
526 | ||
527 | return mask; | |
528 | } | |
529 | ||
530 | static struct proto_ops algif_skcipher_ops = { | |
531 | .family = PF_ALG, | |
532 | ||
533 | .connect = sock_no_connect, | |
534 | .socketpair = sock_no_socketpair, | |
535 | .getname = sock_no_getname, | |
536 | .ioctl = sock_no_ioctl, | |
537 | .listen = sock_no_listen, | |
538 | .shutdown = sock_no_shutdown, | |
539 | .getsockopt = sock_no_getsockopt, | |
540 | .mmap = sock_no_mmap, | |
541 | .bind = sock_no_bind, | |
542 | .accept = sock_no_accept, | |
543 | .setsockopt = sock_no_setsockopt, | |
544 | ||
545 | .release = af_alg_release, | |
546 | .sendmsg = skcipher_sendmsg, | |
547 | .sendpage = skcipher_sendpage, | |
548 | .recvmsg = skcipher_recvmsg, | |
549 | .poll = skcipher_poll, | |
550 | }; | |
551 | ||
552 | static void *skcipher_bind(const char *name, u32 type, u32 mask) | |
553 | { | |
554 | return crypto_alloc_ablkcipher(name, type, mask); | |
555 | } | |
556 | ||
557 | static void skcipher_release(void *private) | |
558 | { | |
559 | crypto_free_ablkcipher(private); | |
560 | } | |
561 | ||
562 | static int skcipher_setkey(void *private, const u8 *key, unsigned int keylen) | |
563 | { | |
564 | return crypto_ablkcipher_setkey(private, key, keylen); | |
565 | } | |
566 | ||
567 | static void skcipher_sock_destruct(struct sock *sk) | |
568 | { | |
569 | struct alg_sock *ask = alg_sk(sk); | |
570 | struct skcipher_ctx *ctx = ask->private; | |
571 | struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(&ctx->req); | |
572 | ||
573 | skcipher_free_sgl(sk); | |
574 | sock_kfree_s(sk, ctx->iv, crypto_ablkcipher_ivsize(tfm)); | |
575 | sock_kfree_s(sk, ctx, ctx->len); | |
576 | af_alg_release_parent(sk); | |
577 | } | |
578 | ||
579 | static int skcipher_accept_parent(void *private, struct sock *sk) | |
580 | { | |
581 | struct skcipher_ctx *ctx; | |
582 | struct alg_sock *ask = alg_sk(sk); | |
583 | unsigned int len = sizeof(*ctx) + crypto_ablkcipher_reqsize(private); | |
584 | ||
585 | ctx = sock_kmalloc(sk, len, GFP_KERNEL); | |
586 | if (!ctx) | |
587 | return -ENOMEM; | |
588 | ||
589 | ctx->iv = sock_kmalloc(sk, crypto_ablkcipher_ivsize(private), | |
590 | GFP_KERNEL); | |
591 | if (!ctx->iv) { | |
592 | sock_kfree_s(sk, ctx, len); | |
593 | return -ENOMEM; | |
594 | } | |
595 | ||
596 | memset(ctx->iv, 0, crypto_ablkcipher_ivsize(private)); | |
597 | ||
598 | INIT_LIST_HEAD(&ctx->tsgl); | |
599 | ctx->len = len; | |
600 | ctx->used = 0; | |
601 | ctx->more = 0; | |
602 | ctx->merge = 0; | |
603 | ctx->enc = 0; | |
604 | af_alg_init_completion(&ctx->completion); | |
605 | ||
606 | ask->private = ctx; | |
607 | ||
608 | ablkcipher_request_set_tfm(&ctx->req, private); | |
609 | ablkcipher_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG, | |
610 | af_alg_complete, &ctx->completion); | |
611 | ||
612 | sk->sk_destruct = skcipher_sock_destruct; | |
613 | ||
614 | return 0; | |
615 | } | |
616 | ||
617 | static const struct af_alg_type algif_type_skcipher = { | |
618 | .bind = skcipher_bind, | |
619 | .release = skcipher_release, | |
620 | .setkey = skcipher_setkey, | |
621 | .accept = skcipher_accept_parent, | |
622 | .ops = &algif_skcipher_ops, | |
623 | .name = "skcipher", | |
624 | .owner = THIS_MODULE | |
625 | }; | |
626 | ||
627 | static int __init algif_skcipher_init(void) | |
628 | { | |
629 | return af_alg_register_type(&algif_type_skcipher); | |
630 | } | |
631 | ||
632 | static void __exit algif_skcipher_exit(void) | |
633 | { | |
634 | int err = af_alg_unregister_type(&algif_type_skcipher); | |
635 | BUG_ON(err); | |
636 | } | |
637 | ||
638 | module_init(algif_skcipher_init); | |
639 | module_exit(algif_skcipher_exit); | |
640 | MODULE_LICENSE("GPL"); |