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_tfm {
35 struct crypto_ablkcipher *skcipher;
36 bool has_key;
37 };
38
39 struct skcipher_ctx {
40 struct list_head tsgl;
41 struct af_alg_sgl rsgl;
42
43 void *iv;
44
45 struct af_alg_completion completion;
46
47 unsigned used;
48
49 unsigned int len;
50 bool more;
51 bool merge;
52 bool enc;
53
54 struct ablkcipher_request req;
55 };
56
57 #define MAX_SGL_ENTS ((4096 - sizeof(struct skcipher_sg_list)) / \
58 sizeof(struct scatterlist) - 1)
59
skcipher_sndbuf(struct sock * sk)60 static inline int skcipher_sndbuf(struct sock *sk)
61 {
62 struct alg_sock *ask = alg_sk(sk);
63 struct skcipher_ctx *ctx = ask->private;
64
65 return max_t(int, max_t(int, sk->sk_sndbuf & PAGE_MASK, PAGE_SIZE) -
66 ctx->used, 0);
67 }
68
skcipher_writable(struct sock * sk)69 static inline bool skcipher_writable(struct sock *sk)
70 {
71 return PAGE_SIZE <= skcipher_sndbuf(sk);
72 }
73
skcipher_alloc_sgl(struct sock * sk)74 static int skcipher_alloc_sgl(struct sock *sk)
75 {
76 struct alg_sock *ask = alg_sk(sk);
77 struct skcipher_ctx *ctx = ask->private;
78 struct skcipher_sg_list *sgl;
79 struct scatterlist *sg = NULL;
80
81 sgl = list_entry(ctx->tsgl.prev, struct skcipher_sg_list, list);
82 if (!list_empty(&ctx->tsgl))
83 sg = sgl->sg;
84
85 if (!sg || sgl->cur >= MAX_SGL_ENTS) {
86 sgl = sock_kmalloc(sk, sizeof(*sgl) +
87 sizeof(sgl->sg[0]) * (MAX_SGL_ENTS + 1),
88 GFP_KERNEL);
89 if (!sgl)
90 return -ENOMEM;
91
92 sg_init_table(sgl->sg, MAX_SGL_ENTS + 1);
93 sgl->cur = 0;
94
95 if (sg) {
96 scatterwalk_sg_chain(sg, MAX_SGL_ENTS + 1, sgl->sg);
97 sg_unmark_end(sg + (MAX_SGL_ENTS - 1));
98 }
99
100 list_add_tail(&sgl->list, &ctx->tsgl);
101 }
102
103 return 0;
104 }
105
skcipher_pull_sgl(struct sock * sk,int used)106 static void skcipher_pull_sgl(struct sock *sk, int used)
107 {
108 struct alg_sock *ask = alg_sk(sk);
109 struct skcipher_ctx *ctx = ask->private;
110 struct skcipher_sg_list *sgl;
111 struct scatterlist *sg;
112 int i;
113
114 while (!list_empty(&ctx->tsgl)) {
115 sgl = list_first_entry(&ctx->tsgl, struct skcipher_sg_list,
116 list);
117 sg = sgl->sg;
118
119 for (i = 0; i < sgl->cur; i++) {
120 int plen = min_t(int, used, sg[i].length);
121
122 if (!sg_page(sg + i))
123 continue;
124
125 sg[i].length -= plen;
126 sg[i].offset += plen;
127
128 used -= plen;
129 ctx->used -= plen;
130
131 if (sg[i].length)
132 return;
133
134 put_page(sg_page(sg + i));
135 sg_assign_page(sg + i, NULL);
136 }
137
138 list_del(&sgl->list);
139 sock_kfree_s(sk, sgl,
140 sizeof(*sgl) + sizeof(sgl->sg[0]) *
141 (MAX_SGL_ENTS + 1));
142 }
143
144 if (!ctx->used)
145 ctx->merge = 0;
146 }
147
skcipher_free_sgl(struct sock * sk)148 static void skcipher_free_sgl(struct sock *sk)
149 {
150 struct alg_sock *ask = alg_sk(sk);
151 struct skcipher_ctx *ctx = ask->private;
152
153 skcipher_pull_sgl(sk, ctx->used);
154 }
155
skcipher_wait_for_wmem(struct sock * sk,unsigned flags)156 static int skcipher_wait_for_wmem(struct sock *sk, unsigned flags)
157 {
158 long timeout;
159 DEFINE_WAIT(wait);
160 int err = -ERESTARTSYS;
161
162 if (flags & MSG_DONTWAIT)
163 return -EAGAIN;
164
165 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
166
167 for (;;) {
168 if (signal_pending(current))
169 break;
170 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
171 timeout = MAX_SCHEDULE_TIMEOUT;
172 if (sk_wait_event(sk, &timeout, skcipher_writable(sk))) {
173 err = 0;
174 break;
175 }
176 }
177 finish_wait(sk_sleep(sk), &wait);
178
179 return err;
180 }
181
skcipher_wmem_wakeup(struct sock * sk)182 static void skcipher_wmem_wakeup(struct sock *sk)
183 {
184 struct socket_wq *wq;
185
186 if (!skcipher_writable(sk))
187 return;
188
189 rcu_read_lock();
190 wq = rcu_dereference(sk->sk_wq);
191 if (wq_has_sleeper(wq))
192 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
193 POLLRDNORM |
194 POLLRDBAND);
195 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
196 rcu_read_unlock();
197 }
198
skcipher_wait_for_data(struct sock * sk,unsigned flags)199 static int skcipher_wait_for_data(struct sock *sk, unsigned flags)
200 {
201 struct alg_sock *ask = alg_sk(sk);
202 struct skcipher_ctx *ctx = ask->private;
203 long timeout;
204 DEFINE_WAIT(wait);
205 int err = -ERESTARTSYS;
206
207 if (flags & MSG_DONTWAIT) {
208 return -EAGAIN;
209 }
210
211 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
212
213 for (;;) {
214 if (signal_pending(current))
215 break;
216 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
217 timeout = MAX_SCHEDULE_TIMEOUT;
218 if (sk_wait_event(sk, &timeout, ctx->used)) {
219 err = 0;
220 break;
221 }
222 }
223 finish_wait(sk_sleep(sk), &wait);
224
225 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
226
227 return err;
228 }
229
skcipher_data_wakeup(struct sock * sk)230 static void skcipher_data_wakeup(struct sock *sk)
231 {
232 struct alg_sock *ask = alg_sk(sk);
233 struct skcipher_ctx *ctx = ask->private;
234 struct socket_wq *wq;
235
236 if (!ctx->used)
237 return;
238
239 rcu_read_lock();
240 wq = rcu_dereference(sk->sk_wq);
241 if (wq_has_sleeper(wq))
242 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
243 POLLRDNORM |
244 POLLRDBAND);
245 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
246 rcu_read_unlock();
247 }
248
skcipher_sendmsg(struct kiocb * unused,struct socket * sock,struct msghdr * msg,size_t size)249 static int skcipher_sendmsg(struct kiocb *unused, struct socket *sock,
250 struct msghdr *msg, size_t size)
251 {
252 struct sock *sk = sock->sk;
253 struct alg_sock *ask = alg_sk(sk);
254 struct skcipher_ctx *ctx = ask->private;
255 struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(&ctx->req);
256 unsigned ivsize = crypto_ablkcipher_ivsize(tfm);
257 struct skcipher_sg_list *sgl;
258 struct af_alg_control con = {};
259 long copied = 0;
260 bool enc = 0;
261 int err;
262 int i;
263
264 if (msg->msg_controllen) {
265 err = af_alg_cmsg_send(msg, &con);
266 if (err)
267 return err;
268
269 switch (con.op) {
270 case ALG_OP_ENCRYPT:
271 enc = 1;
272 break;
273 case ALG_OP_DECRYPT:
274 enc = 0;
275 break;
276 default:
277 return -EINVAL;
278 }
279
280 if (con.iv && con.iv->ivlen != ivsize)
281 return -EINVAL;
282 }
283
284 err = -EINVAL;
285
286 lock_sock(sk);
287 if (!ctx->more && ctx->used)
288 goto unlock;
289
290 if (!ctx->used) {
291 ctx->enc = enc;
292 if (con.iv)
293 memcpy(ctx->iv, con.iv->iv, ivsize);
294 }
295
296 while (size) {
297 struct scatterlist *sg;
298 unsigned long len = size;
299 int plen;
300
301 if (ctx->merge) {
302 sgl = list_entry(ctx->tsgl.prev,
303 struct skcipher_sg_list, list);
304 sg = sgl->sg + sgl->cur - 1;
305 len = min_t(unsigned long, len,
306 PAGE_SIZE - sg->offset - sg->length);
307
308 err = memcpy_fromiovec(page_address(sg_page(sg)) +
309 sg->offset + sg->length,
310 msg->msg_iov, len);
311 if (err)
312 goto unlock;
313
314 sg->length += len;
315 ctx->merge = (sg->offset + sg->length) &
316 (PAGE_SIZE - 1);
317
318 ctx->used += len;
319 copied += len;
320 size -= len;
321 continue;
322 }
323
324 if (!skcipher_writable(sk)) {
325 err = skcipher_wait_for_wmem(sk, msg->msg_flags);
326 if (err)
327 goto unlock;
328 }
329
330 len = min_t(unsigned long, len, skcipher_sndbuf(sk));
331
332 err = skcipher_alloc_sgl(sk);
333 if (err)
334 goto unlock;
335
336 sgl = list_entry(ctx->tsgl.prev, struct skcipher_sg_list, list);
337 sg = sgl->sg;
338 do {
339 i = sgl->cur;
340 plen = min_t(int, len, PAGE_SIZE);
341
342 sg_assign_page(sg + i, alloc_page(GFP_KERNEL));
343 err = -ENOMEM;
344 if (!sg_page(sg + i))
345 goto unlock;
346
347 err = memcpy_fromiovec(page_address(sg_page(sg + i)),
348 msg->msg_iov, plen);
349 if (err) {
350 __free_page(sg_page(sg + i));
351 sg_assign_page(sg + i, NULL);
352 goto unlock;
353 }
354
355 sg[i].length = plen;
356 len -= plen;
357 ctx->used += plen;
358 copied += plen;
359 size -= plen;
360 sgl->cur++;
361 } while (len && sgl->cur < MAX_SGL_ENTS);
362
363 ctx->merge = plen & (PAGE_SIZE - 1);
364 }
365
366 err = 0;
367
368 ctx->more = msg->msg_flags & MSG_MORE;
369 if (!ctx->more && !list_empty(&ctx->tsgl))
370 sgl = list_entry(ctx->tsgl.prev, struct skcipher_sg_list, list);
371
372 unlock:
373 skcipher_data_wakeup(sk);
374 release_sock(sk);
375
376 return copied ?: err;
377 }
378
skcipher_sendpage(struct socket * sock,struct page * page,int offset,size_t size,int flags)379 static ssize_t skcipher_sendpage(struct socket *sock, struct page *page,
380 int offset, size_t size, int flags)
381 {
382 struct sock *sk = sock->sk;
383 struct alg_sock *ask = alg_sk(sk);
384 struct skcipher_ctx *ctx = ask->private;
385 struct skcipher_sg_list *sgl;
386 int err = -EINVAL;
387
388 if (flags & MSG_SENDPAGE_NOTLAST)
389 flags |= MSG_MORE;
390
391 lock_sock(sk);
392 if (!ctx->more && ctx->used)
393 goto unlock;
394
395 if (!size)
396 goto done;
397
398 if (!skcipher_writable(sk)) {
399 err = skcipher_wait_for_wmem(sk, flags);
400 if (err)
401 goto unlock;
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
skcipher_recvmsg(struct kiocb * unused,struct socket * sock,struct msghdr * msg,size_t ignored,int flags)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 used = ctx->used;
452 if (!used) {
453 err = skcipher_wait_for_data(sk, flags);
454 if (err)
455 goto unlock;
456 }
457
458 used = min_t(unsigned long, used, seglen);
459
460 used = af_alg_make_sg(&ctx->rsgl, from, used, 1);
461 err = used;
462 if (err < 0)
463 goto unlock;
464
465 if (ctx->more || used < ctx->used)
466 used -= used % bs;
467
468 err = -EINVAL;
469 if (!used)
470 goto free;
471
472 sgl = list_first_entry(&ctx->tsgl,
473 struct skcipher_sg_list, list);
474 sg = sgl->sg;
475
476 while (!sg->length)
477 sg++;
478
479 ablkcipher_request_set_crypt(&ctx->req, sg,
480 ctx->rsgl.sg, used,
481 ctx->iv);
482
483 err = af_alg_wait_for_completion(
484 ctx->enc ?
485 crypto_ablkcipher_encrypt(&ctx->req) :
486 crypto_ablkcipher_decrypt(&ctx->req),
487 &ctx->completion);
488
489 free:
490 af_alg_free_sg(&ctx->rsgl);
491
492 if (err)
493 goto unlock;
494
495 copied += used;
496 from += used;
497 seglen -= used;
498 skcipher_pull_sgl(sk, used);
499 }
500 }
501
502 err = 0;
503
504 unlock:
505 skcipher_wmem_wakeup(sk);
506 release_sock(sk);
507
508 return copied ?: err;
509 }
510
511
skcipher_poll(struct file * file,struct socket * sock,poll_table * wait)512 static unsigned int skcipher_poll(struct file *file, struct socket *sock,
513 poll_table *wait)
514 {
515 struct sock *sk = sock->sk;
516 struct alg_sock *ask = alg_sk(sk);
517 struct skcipher_ctx *ctx = ask->private;
518 unsigned int mask;
519
520 sock_poll_wait(file, sk_sleep(sk), wait);
521 mask = 0;
522
523 if (ctx->used)
524 mask |= POLLIN | POLLRDNORM;
525
526 if (skcipher_writable(sk))
527 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
528
529 return mask;
530 }
531
532 static struct proto_ops algif_skcipher_ops = {
533 .family = PF_ALG,
534
535 .connect = sock_no_connect,
536 .socketpair = sock_no_socketpair,
537 .getname = sock_no_getname,
538 .ioctl = sock_no_ioctl,
539 .listen = sock_no_listen,
540 .shutdown = sock_no_shutdown,
541 .getsockopt = sock_no_getsockopt,
542 .mmap = sock_no_mmap,
543 .bind = sock_no_bind,
544 .accept = sock_no_accept,
545 .setsockopt = sock_no_setsockopt,
546
547 .release = af_alg_release,
548 .sendmsg = skcipher_sendmsg,
549 .sendpage = skcipher_sendpage,
550 .recvmsg = skcipher_recvmsg,
551 .poll = skcipher_poll,
552 };
553
skcipher_check_key(struct socket * sock)554 static int skcipher_check_key(struct socket *sock)
555 {
556 int err = 0;
557 struct sock *psk;
558 struct alg_sock *pask;
559 struct skcipher_tfm *tfm;
560 struct sock *sk = sock->sk;
561 struct alg_sock *ask = alg_sk(sk);
562
563 lock_sock(sk);
564 if (ask->refcnt)
565 goto unlock_child;
566
567 psk = ask->parent;
568 pask = alg_sk(ask->parent);
569 tfm = pask->private;
570
571 err = -ENOKEY;
572 lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
573 if (!tfm->has_key)
574 goto unlock;
575
576 if (!pask->refcnt++)
577 sock_hold(psk);
578
579 ask->refcnt = 1;
580 sock_put(psk);
581
582 err = 0;
583
584 unlock:
585 release_sock(psk);
586 unlock_child:
587 release_sock(sk);
588
589 return err;
590 }
591
skcipher_sendmsg_nokey(struct kiocb * unused,struct socket * sock,struct msghdr * msg,size_t size)592 static int skcipher_sendmsg_nokey(struct kiocb *unused, struct socket *sock,
593 struct msghdr *msg, size_t size)
594 {
595 int err;
596
597 err = skcipher_check_key(sock);
598 if (err)
599 return err;
600
601 return skcipher_sendmsg(NULL, sock, msg, size);
602 }
603
skcipher_sendpage_nokey(struct socket * sock,struct page * page,int offset,size_t size,int flags)604 static ssize_t skcipher_sendpage_nokey(struct socket *sock, struct page *page,
605 int offset, size_t size, int flags)
606 {
607 int err;
608
609 err = skcipher_check_key(sock);
610 if (err)
611 return err;
612
613 return skcipher_sendpage(sock, page, offset, size, flags);
614 }
615
skcipher_recvmsg_nokey(struct kiocb * unused,struct socket * sock,struct msghdr * msg,size_t ignored,int flags)616 static int skcipher_recvmsg_nokey(struct kiocb *unused, struct socket *sock,
617 struct msghdr *msg, size_t ignored, int flags)
618 {
619 int err;
620
621 err = skcipher_check_key(sock);
622 if (err)
623 return err;
624
625 return skcipher_recvmsg(NULL, sock, msg, ignored, flags);
626 }
627
628 static struct proto_ops algif_skcipher_ops_nokey = {
629 .family = PF_ALG,
630
631 .connect = sock_no_connect,
632 .socketpair = sock_no_socketpair,
633 .getname = sock_no_getname,
634 .ioctl = sock_no_ioctl,
635 .listen = sock_no_listen,
636 .shutdown = sock_no_shutdown,
637 .getsockopt = sock_no_getsockopt,
638 .mmap = sock_no_mmap,
639 .bind = sock_no_bind,
640 .accept = sock_no_accept,
641 .setsockopt = sock_no_setsockopt,
642
643 .release = af_alg_release,
644 .sendmsg = skcipher_sendmsg_nokey,
645 .sendpage = skcipher_sendpage_nokey,
646 .recvmsg = skcipher_recvmsg_nokey,
647 .poll = skcipher_poll,
648 };
649
skcipher_bind(const char * name,u32 type,u32 mask)650 static void *skcipher_bind(const char *name, u32 type, u32 mask)
651 {
652 struct skcipher_tfm *tfm;
653 struct crypto_ablkcipher *skcipher;
654
655 tfm = kzalloc(sizeof(*tfm), GFP_KERNEL);
656 if (!tfm)
657 return ERR_PTR(-ENOMEM);
658
659 skcipher = crypto_alloc_ablkcipher(name, type, mask);
660 if (IS_ERR(skcipher)) {
661 kfree(tfm);
662 return ERR_CAST(skcipher);
663 }
664
665 tfm->skcipher = skcipher;
666
667 return tfm;
668 }
669
skcipher_release(void * private)670 static void skcipher_release(void *private)
671 {
672 struct skcipher_tfm *tfm = private;
673
674 crypto_free_ablkcipher(tfm->skcipher);
675 kfree(tfm);
676 }
677
skcipher_setkey(void * private,const u8 * key,unsigned int keylen)678 static int skcipher_setkey(void *private, const u8 *key, unsigned int keylen)
679 {
680 struct skcipher_tfm *tfm = private;
681 int err;
682
683 err = crypto_ablkcipher_setkey(tfm->skcipher, key, keylen);
684 tfm->has_key = !err;
685
686 return err;
687 }
688
skcipher_sock_destruct(struct sock * sk)689 static void skcipher_sock_destruct(struct sock *sk)
690 {
691 struct alg_sock *ask = alg_sk(sk);
692 struct skcipher_ctx *ctx = ask->private;
693 struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(&ctx->req);
694
695 skcipher_free_sgl(sk);
696 sock_kfree_s(sk, ctx->iv, crypto_ablkcipher_ivsize(tfm));
697 sock_kfree_s(sk, ctx, ctx->len);
698 af_alg_release_parent(sk);
699 }
700
skcipher_accept_parent_nokey(void * private,struct sock * sk)701 static int skcipher_accept_parent_nokey(void *private, struct sock *sk)
702 {
703 struct skcipher_ctx *ctx;
704 struct alg_sock *ask = alg_sk(sk);
705 struct skcipher_tfm *tfm = private;
706 struct crypto_ablkcipher *skcipher = tfm->skcipher;
707 unsigned int len = sizeof(*ctx) + crypto_ablkcipher_reqsize(skcipher);
708
709 ctx = sock_kmalloc(sk, len, GFP_KERNEL);
710 if (!ctx)
711 return -ENOMEM;
712
713 ctx->iv = sock_kmalloc(sk, crypto_ablkcipher_ivsize(skcipher),
714 GFP_KERNEL);
715 if (!ctx->iv) {
716 sock_kfree_s(sk, ctx, len);
717 return -ENOMEM;
718 }
719
720 memset(ctx->iv, 0, crypto_ablkcipher_ivsize(skcipher));
721
722
723 INIT_LIST_HEAD(&ctx->tsgl);
724 ctx->len = len;
725 ctx->used = 0;
726 ctx->more = 0;
727 ctx->merge = 0;
728 ctx->enc = 0;
729 af_alg_init_completion(&ctx->completion);
730
731 ask->private = ctx;
732
733 ablkcipher_request_set_tfm(&ctx->req, skcipher);
734 ablkcipher_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
735 af_alg_complete, &ctx->completion);
736
737 sk->sk_destruct = skcipher_sock_destruct;
738
739 return 0;
740 }
741
skcipher_accept_parent(void * private,struct sock * sk)742 static int skcipher_accept_parent(void *private, struct sock *sk)
743 {
744 struct skcipher_tfm *tfm = private;
745
746 if (!tfm->has_key)
747 return -ENOKEY;
748
749 return skcipher_accept_parent_nokey(private, sk);
750 }
751
752 static const struct af_alg_type algif_type_skcipher = {
753 .bind = skcipher_bind,
754 .release = skcipher_release,
755 .setkey = skcipher_setkey,
756 .accept = skcipher_accept_parent,
757 .accept_nokey = skcipher_accept_parent_nokey,
758 .ops = &algif_skcipher_ops,
759 .ops_nokey = &algif_skcipher_ops_nokey,
760 .name = "skcipher",
761 .owner = THIS_MODULE
762 };
763
algif_skcipher_init(void)764 static int __init algif_skcipher_init(void)
765 {
766 return af_alg_register_type(&algif_type_skcipher);
767 }
768
algif_skcipher_exit(void)769 static void __exit algif_skcipher_exit(void)
770 {
771 int err = af_alg_unregister_type(&algif_type_skcipher);
772 BUG_ON(err);
773 }
774
775 module_init(algif_skcipher_init);
776 module_exit(algif_skcipher_exit);
777 MODULE_LICENSE("GPL");
778