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400c40cf SM |
1 | /* |
2 | * algif_aead: User-space interface for AEAD algorithms | |
3 | * | |
4 | * Copyright (C) 2014, Stephan Mueller <smueller@chronox.de> | |
5 | * | |
6 | * This file provides the user-space API for AEAD ciphers. | |
7 | * | |
8 | * This file is derived from algif_skcipher.c. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify it | |
11 | * under the terms of the GNU General Public License as published by the Free | |
12 | * Software Foundation; either version 2 of the License, or (at your option) | |
13 | * any later version. | |
14 | */ | |
15 | ||
89081da5 | 16 | #include <crypto/aead.h> |
400c40cf SM |
17 | #include <crypto/scatterwalk.h> |
18 | #include <crypto/if_alg.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/list.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/mm.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/net.h> | |
25 | #include <net/sock.h> | |
26 | ||
27 | struct aead_sg_list { | |
28 | unsigned int cur; | |
29 | struct scatterlist sg[ALG_MAX_PAGES]; | |
30 | }; | |
31 | ||
32 | struct aead_ctx { | |
33 | struct aead_sg_list tsgl; | |
34 | /* | |
35 | * RSGL_MAX_ENTRIES is an artificial limit where user space at maximum | |
36 | * can cause the kernel to allocate RSGL_MAX_ENTRIES * ALG_MAX_PAGES | |
7b2a18e0 | 37 | * pages |
400c40cf SM |
38 | */ |
39 | #define RSGL_MAX_ENTRIES ALG_MAX_PAGES | |
40 | struct af_alg_sgl rsgl[RSGL_MAX_ENTRIES]; | |
41 | ||
42 | void *iv; | |
43 | ||
44 | struct af_alg_completion completion; | |
45 | ||
46 | unsigned long used; | |
47 | ||
48 | unsigned int len; | |
49 | bool more; | |
50 | bool merge; | |
51 | bool enc; | |
52 | ||
53 | size_t aead_assoclen; | |
54 | struct aead_request aead_req; | |
55 | }; | |
56 | ||
57 | static inline int aead_sndbuf(struct sock *sk) | |
58 | { | |
59 | struct alg_sock *ask = alg_sk(sk); | |
60 | struct aead_ctx *ctx = ask->private; | |
61 | ||
62 | return max_t(int, max_t(int, sk->sk_sndbuf & PAGE_MASK, PAGE_SIZE) - | |
63 | ctx->used, 0); | |
64 | } | |
65 | ||
66 | static inline bool aead_writable(struct sock *sk) | |
67 | { | |
68 | return PAGE_SIZE <= aead_sndbuf(sk); | |
69 | } | |
70 | ||
71 | static inline bool aead_sufficient_data(struct aead_ctx *ctx) | |
72 | { | |
73 | unsigned as = crypto_aead_authsize(crypto_aead_reqtfm(&ctx->aead_req)); | |
74 | ||
19fa7752 | 75 | return ctx->used >= ctx->aead_assoclen + as; |
400c40cf SM |
76 | } |
77 | ||
78 | static void aead_put_sgl(struct sock *sk) | |
79 | { | |
80 | struct alg_sock *ask = alg_sk(sk); | |
81 | struct aead_ctx *ctx = ask->private; | |
82 | struct aead_sg_list *sgl = &ctx->tsgl; | |
83 | struct scatterlist *sg = sgl->sg; | |
84 | unsigned int i; | |
85 | ||
86 | for (i = 0; i < sgl->cur; i++) { | |
87 | if (!sg_page(sg + i)) | |
88 | continue; | |
89 | ||
90 | put_page(sg_page(sg + i)); | |
91 | sg_assign_page(sg + i, NULL); | |
92 | } | |
bf433416 | 93 | sg_init_table(sg, ALG_MAX_PAGES); |
400c40cf SM |
94 | sgl->cur = 0; |
95 | ctx->used = 0; | |
96 | ctx->more = 0; | |
97 | ctx->merge = 0; | |
98 | } | |
99 | ||
100 | static void aead_wmem_wakeup(struct sock *sk) | |
101 | { | |
102 | struct socket_wq *wq; | |
103 | ||
104 | if (!aead_writable(sk)) | |
105 | return; | |
106 | ||
107 | rcu_read_lock(); | |
108 | wq = rcu_dereference(sk->sk_wq); | |
1ce0bf50 | 109 | if (skwq_has_sleeper(wq)) |
400c40cf SM |
110 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | |
111 | POLLRDNORM | | |
112 | POLLRDBAND); | |
113 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); | |
114 | rcu_read_unlock(); | |
115 | } | |
116 | ||
117 | static int aead_wait_for_data(struct sock *sk, unsigned flags) | |
118 | { | |
119 | struct alg_sock *ask = alg_sk(sk); | |
120 | struct aead_ctx *ctx = ask->private; | |
121 | long timeout; | |
122 | DEFINE_WAIT(wait); | |
123 | int err = -ERESTARTSYS; | |
124 | ||
125 | if (flags & MSG_DONTWAIT) | |
126 | return -EAGAIN; | |
127 | ||
9cd3e072 | 128 | sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
400c40cf SM |
129 | |
130 | for (;;) { | |
131 | if (signal_pending(current)) | |
132 | break; | |
133 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
134 | timeout = MAX_SCHEDULE_TIMEOUT; | |
135 | if (sk_wait_event(sk, &timeout, !ctx->more)) { | |
136 | err = 0; | |
137 | break; | |
138 | } | |
139 | } | |
140 | finish_wait(sk_sleep(sk), &wait); | |
141 | ||
9cd3e072 | 142 | sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
400c40cf SM |
143 | |
144 | return err; | |
145 | } | |
146 | ||
147 | static void aead_data_wakeup(struct sock *sk) | |
148 | { | |
149 | struct alg_sock *ask = alg_sk(sk); | |
150 | struct aead_ctx *ctx = ask->private; | |
151 | struct socket_wq *wq; | |
152 | ||
153 | if (ctx->more) | |
154 | return; | |
155 | if (!ctx->used) | |
156 | return; | |
157 | ||
158 | rcu_read_lock(); | |
159 | wq = rcu_dereference(sk->sk_wq); | |
1ce0bf50 | 160 | if (skwq_has_sleeper(wq)) |
400c40cf SM |
161 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | |
162 | POLLRDNORM | | |
163 | POLLRDBAND); | |
164 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); | |
165 | rcu_read_unlock(); | |
166 | } | |
167 | ||
eccd02f3 | 168 | static int aead_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) |
400c40cf SM |
169 | { |
170 | struct sock *sk = sock->sk; | |
171 | struct alg_sock *ask = alg_sk(sk); | |
172 | struct aead_ctx *ctx = ask->private; | |
173 | unsigned ivsize = | |
174 | crypto_aead_ivsize(crypto_aead_reqtfm(&ctx->aead_req)); | |
175 | struct aead_sg_list *sgl = &ctx->tsgl; | |
176 | struct af_alg_control con = {}; | |
177 | long copied = 0; | |
178 | bool enc = 0; | |
179 | bool init = 0; | |
180 | int err = -EINVAL; | |
181 | ||
182 | if (msg->msg_controllen) { | |
183 | err = af_alg_cmsg_send(msg, &con); | |
184 | if (err) | |
185 | return err; | |
186 | ||
187 | init = 1; | |
188 | switch (con.op) { | |
189 | case ALG_OP_ENCRYPT: | |
190 | enc = 1; | |
191 | break; | |
192 | case ALG_OP_DECRYPT: | |
193 | enc = 0; | |
194 | break; | |
195 | default: | |
196 | return -EINVAL; | |
197 | } | |
198 | ||
199 | if (con.iv && con.iv->ivlen != ivsize) | |
200 | return -EINVAL; | |
201 | } | |
202 | ||
203 | lock_sock(sk); | |
204 | if (!ctx->more && ctx->used) | |
205 | goto unlock; | |
206 | ||
207 | if (init) { | |
208 | ctx->enc = enc; | |
209 | if (con.iv) | |
210 | memcpy(ctx->iv, con.iv->iv, ivsize); | |
211 | ||
212 | ctx->aead_assoclen = con.aead_assoclen; | |
213 | } | |
214 | ||
215 | while (size) { | |
652d5b8a | 216 | size_t len = size; |
400c40cf SM |
217 | struct scatterlist *sg = NULL; |
218 | ||
219 | /* use the existing memory in an allocated page */ | |
220 | if (ctx->merge) { | |
221 | sg = sgl->sg + sgl->cur - 1; | |
222 | len = min_t(unsigned long, len, | |
223 | PAGE_SIZE - sg->offset - sg->length); | |
224 | err = memcpy_from_msg(page_address(sg_page(sg)) + | |
225 | sg->offset + sg->length, | |
226 | msg, len); | |
227 | if (err) | |
228 | goto unlock; | |
229 | ||
230 | sg->length += len; | |
231 | ctx->merge = (sg->offset + sg->length) & | |
232 | (PAGE_SIZE - 1); | |
233 | ||
234 | ctx->used += len; | |
235 | copied += len; | |
236 | size -= len; | |
237 | continue; | |
238 | } | |
239 | ||
240 | if (!aead_writable(sk)) { | |
241 | /* user space sent too much data */ | |
242 | aead_put_sgl(sk); | |
243 | err = -EMSGSIZE; | |
244 | goto unlock; | |
245 | } | |
246 | ||
247 | /* allocate a new page */ | |
248 | len = min_t(unsigned long, size, aead_sndbuf(sk)); | |
249 | while (len) { | |
652d5b8a | 250 | size_t plen = 0; |
400c40cf SM |
251 | |
252 | if (sgl->cur >= ALG_MAX_PAGES) { | |
253 | aead_put_sgl(sk); | |
254 | err = -E2BIG; | |
255 | goto unlock; | |
256 | } | |
257 | ||
258 | sg = sgl->sg + sgl->cur; | |
652d5b8a | 259 | plen = min_t(size_t, len, PAGE_SIZE); |
400c40cf SM |
260 | |
261 | sg_assign_page(sg, alloc_page(GFP_KERNEL)); | |
262 | err = -ENOMEM; | |
263 | if (!sg_page(sg)) | |
264 | goto unlock; | |
265 | ||
266 | err = memcpy_from_msg(page_address(sg_page(sg)), | |
267 | msg, plen); | |
268 | if (err) { | |
269 | __free_page(sg_page(sg)); | |
270 | sg_assign_page(sg, NULL); | |
271 | goto unlock; | |
272 | } | |
273 | ||
274 | sg->offset = 0; | |
275 | sg->length = plen; | |
276 | len -= plen; | |
277 | ctx->used += plen; | |
278 | copied += plen; | |
279 | sgl->cur++; | |
280 | size -= plen; | |
281 | ctx->merge = plen & (PAGE_SIZE - 1); | |
282 | } | |
283 | } | |
284 | ||
285 | err = 0; | |
286 | ||
287 | ctx->more = msg->msg_flags & MSG_MORE; | |
288 | if (!ctx->more && !aead_sufficient_data(ctx)) { | |
289 | aead_put_sgl(sk); | |
290 | err = -EMSGSIZE; | |
291 | } | |
292 | ||
293 | unlock: | |
294 | aead_data_wakeup(sk); | |
295 | release_sock(sk); | |
296 | ||
297 | return err ?: copied; | |
298 | } | |
299 | ||
300 | static ssize_t aead_sendpage(struct socket *sock, struct page *page, | |
301 | int offset, size_t size, int flags) | |
302 | { | |
303 | struct sock *sk = sock->sk; | |
304 | struct alg_sock *ask = alg_sk(sk); | |
305 | struct aead_ctx *ctx = ask->private; | |
306 | struct aead_sg_list *sgl = &ctx->tsgl; | |
307 | int err = -EINVAL; | |
308 | ||
309 | if (flags & MSG_SENDPAGE_NOTLAST) | |
310 | flags |= MSG_MORE; | |
311 | ||
312 | if (sgl->cur >= ALG_MAX_PAGES) | |
313 | return -E2BIG; | |
314 | ||
315 | lock_sock(sk); | |
316 | if (!ctx->more && ctx->used) | |
317 | goto unlock; | |
318 | ||
319 | if (!size) | |
320 | goto done; | |
321 | ||
322 | if (!aead_writable(sk)) { | |
323 | /* user space sent too much data */ | |
324 | aead_put_sgl(sk); | |
325 | err = -EMSGSIZE; | |
326 | goto unlock; | |
327 | } | |
328 | ||
329 | ctx->merge = 0; | |
330 | ||
331 | get_page(page); | |
332 | sg_set_page(sgl->sg + sgl->cur, page, size, offset); | |
333 | sgl->cur++; | |
334 | ctx->used += size; | |
335 | ||
336 | err = 0; | |
337 | ||
338 | done: | |
339 | ctx->more = flags & MSG_MORE; | |
340 | if (!ctx->more && !aead_sufficient_data(ctx)) { | |
341 | aead_put_sgl(sk); | |
342 | err = -EMSGSIZE; | |
343 | } | |
344 | ||
345 | unlock: | |
346 | aead_data_wakeup(sk); | |
347 | release_sock(sk); | |
348 | ||
349 | return err ?: size; | |
350 | } | |
351 | ||
eccd02f3 | 352 | static int aead_recvmsg(struct socket *sock, struct msghdr *msg, size_t ignored, int flags) |
400c40cf SM |
353 | { |
354 | struct sock *sk = sock->sk; | |
355 | struct alg_sock *ask = alg_sk(sk); | |
356 | struct aead_ctx *ctx = ask->private; | |
400c40cf SM |
357 | unsigned as = crypto_aead_authsize(crypto_aead_reqtfm(&ctx->aead_req)); |
358 | struct aead_sg_list *sgl = &ctx->tsgl; | |
400c40cf SM |
359 | unsigned int i = 0; |
360 | int err = -EINVAL; | |
361 | unsigned long used = 0; | |
362 | size_t outlen = 0; | |
363 | size_t usedpages = 0; | |
364 | unsigned int cnt = 0; | |
365 | ||
366 | /* Limit number of IOV blocks to be accessed below */ | |
367 | if (msg->msg_iter.nr_segs > RSGL_MAX_ENTRIES) | |
368 | return -ENOMSG; | |
369 | ||
370 | lock_sock(sk); | |
371 | ||
372 | /* | |
373 | * AEAD memory structure: For encryption, the tag is appended to the | |
374 | * ciphertext which implies that the memory allocated for the ciphertext | |
375 | * must be increased by the tag length. For decryption, the tag | |
376 | * is expected to be concatenated to the ciphertext. The plaintext | |
377 | * therefore has a memory size of the ciphertext minus the tag length. | |
378 | * | |
379 | * The memory structure for cipher operation has the following | |
380 | * structure: | |
381 | * AEAD encryption input: assoc data || plaintext | |
382 | * AEAD encryption output: cipherntext || auth tag | |
383 | * AEAD decryption input: assoc data || ciphertext || auth tag | |
384 | * AEAD decryption output: plaintext | |
385 | */ | |
386 | ||
387 | if (ctx->more) { | |
388 | err = aead_wait_for_data(sk, flags); | |
389 | if (err) | |
390 | goto unlock; | |
391 | } | |
392 | ||
393 | used = ctx->used; | |
394 | ||
395 | /* | |
396 | * Make sure sufficient data is present -- note, the same check is | |
397 | * is also present in sendmsg/sendpage. The checks in sendpage/sendmsg | |
398 | * shall provide an information to the data sender that something is | |
399 | * wrong, but they are irrelevant to maintain the kernel integrity. | |
400 | * We need this check here too in case user space decides to not honor | |
401 | * the error message in sendmsg/sendpage and still call recvmsg. This | |
402 | * check here protects the kernel integrity. | |
403 | */ | |
404 | if (!aead_sufficient_data(ctx)) | |
405 | goto unlock; | |
406 | ||
19fa7752 HX |
407 | outlen = used; |
408 | ||
400c40cf SM |
409 | /* |
410 | * The cipher operation input data is reduced by the associated data | |
411 | * length as this data is processed separately later on. | |
412 | */ | |
19fa7752 | 413 | used -= ctx->aead_assoclen + (ctx->enc ? as : 0); |
400c40cf SM |
414 | |
415 | /* convert iovecs of output buffers into scatterlists */ | |
416 | while (iov_iter_count(&msg->msg_iter)) { | |
417 | size_t seglen = min_t(size_t, iov_iter_count(&msg->msg_iter), | |
418 | (outlen - usedpages)); | |
419 | ||
420 | /* make one iovec available as scatterlist */ | |
421 | err = af_alg_make_sg(&ctx->rsgl[cnt], &msg->msg_iter, | |
422 | seglen); | |
423 | if (err < 0) | |
424 | goto unlock; | |
425 | usedpages += err; | |
7b2a18e0 | 426 | /* chain the new scatterlist with previous one */ |
400c40cf | 427 | if (cnt) |
7b2a18e0 TS |
428 | af_alg_link_sg(&ctx->rsgl[cnt-1], &ctx->rsgl[cnt]); |
429 | ||
400c40cf SM |
430 | /* we do not need more iovecs as we have sufficient memory */ |
431 | if (outlen <= usedpages) | |
432 | break; | |
433 | iov_iter_advance(&msg->msg_iter, err); | |
434 | cnt++; | |
435 | } | |
436 | ||
437 | err = -EINVAL; | |
438 | /* ensure output buffer is sufficiently large */ | |
439 | if (usedpages < outlen) | |
440 | goto unlock; | |
441 | ||
19fa7752 | 442 | sg_mark_end(sgl->sg + sgl->cur - 1); |
400c40cf | 443 | |
19fa7752 HX |
444 | aead_request_set_crypt(&ctx->aead_req, sgl->sg, ctx->rsgl[0].sg, |
445 | used, ctx->iv); | |
446 | aead_request_set_ad(&ctx->aead_req, ctx->aead_assoclen); | |
400c40cf SM |
447 | |
448 | err = af_alg_wait_for_completion(ctx->enc ? | |
449 | crypto_aead_encrypt(&ctx->aead_req) : | |
450 | crypto_aead_decrypt(&ctx->aead_req), | |
451 | &ctx->completion); | |
452 | ||
453 | if (err) { | |
454 | /* EBADMSG implies a valid cipher operation took place */ | |
455 | if (err == -EBADMSG) | |
456 | aead_put_sgl(sk); | |
457 | goto unlock; | |
458 | } | |
459 | ||
460 | aead_put_sgl(sk); | |
461 | ||
462 | err = 0; | |
463 | ||
464 | unlock: | |
465 | for (i = 0; i < cnt; i++) | |
466 | af_alg_free_sg(&ctx->rsgl[i]); | |
467 | ||
468 | aead_wmem_wakeup(sk); | |
469 | release_sock(sk); | |
470 | ||
471 | return err ? err : outlen; | |
472 | } | |
473 | ||
474 | static unsigned int aead_poll(struct file *file, struct socket *sock, | |
475 | poll_table *wait) | |
476 | { | |
477 | struct sock *sk = sock->sk; | |
478 | struct alg_sock *ask = alg_sk(sk); | |
479 | struct aead_ctx *ctx = ask->private; | |
480 | unsigned int mask; | |
481 | ||
482 | sock_poll_wait(file, sk_sleep(sk), wait); | |
483 | mask = 0; | |
484 | ||
485 | if (!ctx->more) | |
486 | mask |= POLLIN | POLLRDNORM; | |
487 | ||
488 | if (aead_writable(sk)) | |
489 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
490 | ||
491 | return mask; | |
492 | } | |
493 | ||
494 | static struct proto_ops algif_aead_ops = { | |
495 | .family = PF_ALG, | |
496 | ||
497 | .connect = sock_no_connect, | |
498 | .socketpair = sock_no_socketpair, | |
499 | .getname = sock_no_getname, | |
500 | .ioctl = sock_no_ioctl, | |
501 | .listen = sock_no_listen, | |
502 | .shutdown = sock_no_shutdown, | |
503 | .getsockopt = sock_no_getsockopt, | |
504 | .mmap = sock_no_mmap, | |
505 | .bind = sock_no_bind, | |
506 | .accept = sock_no_accept, | |
507 | .setsockopt = sock_no_setsockopt, | |
508 | ||
509 | .release = af_alg_release, | |
510 | .sendmsg = aead_sendmsg, | |
511 | .sendpage = aead_sendpage, | |
512 | .recvmsg = aead_recvmsg, | |
513 | .poll = aead_poll, | |
514 | }; | |
515 | ||
516 | static void *aead_bind(const char *name, u32 type, u32 mask) | |
517 | { | |
5e4b8c1f | 518 | return crypto_alloc_aead(name, type, mask); |
400c40cf SM |
519 | } |
520 | ||
521 | static void aead_release(void *private) | |
522 | { | |
523 | crypto_free_aead(private); | |
524 | } | |
525 | ||
526 | static int aead_setauthsize(void *private, unsigned int authsize) | |
527 | { | |
528 | return crypto_aead_setauthsize(private, authsize); | |
529 | } | |
530 | ||
531 | static int aead_setkey(void *private, const u8 *key, unsigned int keylen) | |
532 | { | |
533 | return crypto_aead_setkey(private, key, keylen); | |
534 | } | |
535 | ||
536 | static void aead_sock_destruct(struct sock *sk) | |
537 | { | |
538 | struct alg_sock *ask = alg_sk(sk); | |
539 | struct aead_ctx *ctx = ask->private; | |
540 | unsigned int ivlen = crypto_aead_ivsize( | |
541 | crypto_aead_reqtfm(&ctx->aead_req)); | |
542 | ||
543 | aead_put_sgl(sk); | |
544 | sock_kzfree_s(sk, ctx->iv, ivlen); | |
545 | sock_kfree_s(sk, ctx, ctx->len); | |
546 | af_alg_release_parent(sk); | |
547 | } | |
548 | ||
549 | static int aead_accept_parent(void *private, struct sock *sk) | |
550 | { | |
551 | struct aead_ctx *ctx; | |
552 | struct alg_sock *ask = alg_sk(sk); | |
553 | unsigned int len = sizeof(*ctx) + crypto_aead_reqsize(private); | |
554 | unsigned int ivlen = crypto_aead_ivsize(private); | |
555 | ||
556 | ctx = sock_kmalloc(sk, len, GFP_KERNEL); | |
557 | if (!ctx) | |
558 | return -ENOMEM; | |
559 | memset(ctx, 0, len); | |
560 | ||
561 | ctx->iv = sock_kmalloc(sk, ivlen, GFP_KERNEL); | |
562 | if (!ctx->iv) { | |
563 | sock_kfree_s(sk, ctx, len); | |
564 | return -ENOMEM; | |
565 | } | |
566 | memset(ctx->iv, 0, ivlen); | |
567 | ||
568 | ctx->len = len; | |
569 | ctx->used = 0; | |
570 | ctx->more = 0; | |
571 | ctx->merge = 0; | |
572 | ctx->enc = 0; | |
573 | ctx->tsgl.cur = 0; | |
574 | ctx->aead_assoclen = 0; | |
575 | af_alg_init_completion(&ctx->completion); | |
576 | sg_init_table(ctx->tsgl.sg, ALG_MAX_PAGES); | |
577 | ||
578 | ask->private = ctx; | |
579 | ||
580 | aead_request_set_tfm(&ctx->aead_req, private); | |
581 | aead_request_set_callback(&ctx->aead_req, CRYPTO_TFM_REQ_MAY_BACKLOG, | |
582 | af_alg_complete, &ctx->completion); | |
583 | ||
584 | sk->sk_destruct = aead_sock_destruct; | |
585 | ||
586 | return 0; | |
587 | } | |
588 | ||
589 | static const struct af_alg_type algif_type_aead = { | |
590 | .bind = aead_bind, | |
591 | .release = aead_release, | |
592 | .setkey = aead_setkey, | |
593 | .setauthsize = aead_setauthsize, | |
594 | .accept = aead_accept_parent, | |
595 | .ops = &algif_aead_ops, | |
596 | .name = "aead", | |
597 | .owner = THIS_MODULE | |
598 | }; | |
599 | ||
600 | static int __init algif_aead_init(void) | |
601 | { | |
602 | return af_alg_register_type(&algif_type_aead); | |
603 | } | |
604 | ||
605 | static void __exit algif_aead_exit(void) | |
606 | { | |
607 | int err = af_alg_unregister_type(&algif_type_aead); | |
608 | BUG_ON(err); | |
609 | } | |
610 | ||
611 | module_init(algif_aead_init); | |
612 | module_exit(algif_aead_exit); | |
613 | MODULE_LICENSE("GPL"); | |
614 | MODULE_AUTHOR("Stephan Mueller <smueller@chronox.de>"); | |
615 | MODULE_DESCRIPTION("AEAD kernel crypto API user space interface"); |