2 * algif_hash: User-space interface for hash algorithms
4 * This file provides the user-space API for hash algorithms.
6 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
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)
15 #include <crypto/hash.h>
16 #include <crypto/if_alg.h>
17 #include <linux/init.h>
18 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/net.h>
25 struct af_alg_sgl sgl;
29 struct af_alg_completion completion;
34 struct ahash_request req;
37 struct algif_hash_tfm {
38 struct crypto_ahash *hash;
42 static int hash_sendmsg(struct kiocb *unused, struct socket *sock,
43 struct msghdr *msg, size_t ignored)
45 int limit = ALG_MAX_PAGES * PAGE_SIZE;
46 struct sock *sk = sock->sk;
47 struct alg_sock *ask = alg_sk(sk);
48 struct hash_ctx *ctx = ask->private;
54 if (limit > sk->sk_sndbuf)
55 limit = sk->sk_sndbuf;
59 err = crypto_ahash_init(&ctx->req);
66 for (iov = msg->msg_iov, iovlen = msg->msg_iovlen; iovlen > 0;
68 unsigned long seglen = iov->iov_len;
69 char __user *from = iov->iov_base;
72 int len = min_t(unsigned long, seglen, limit);
75 newlen = af_alg_make_sg(&ctx->sgl, from, len, 0);
77 err = copied ? 0 : newlen;
81 ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL,
84 err = af_alg_wait_for_completion(
85 crypto_ahash_update(&ctx->req),
88 af_alg_free_sg(&ctx->sgl);
101 ctx->more = msg->msg_flags & MSG_MORE;
103 ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
104 err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
111 return err ?: copied;
114 static ssize_t hash_sendpage(struct socket *sock, struct page *page,
115 int offset, size_t size, int flags)
117 struct sock *sk = sock->sk;
118 struct alg_sock *ask = alg_sk(sk);
119 struct hash_ctx *ctx = ask->private;
122 if (flags & MSG_SENDPAGE_NOTLAST)
126 sg_init_table(ctx->sgl.sg, 1);
127 sg_set_page(ctx->sgl.sg, page, size, offset);
129 ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size);
131 if (!(flags & MSG_MORE)) {
133 err = crypto_ahash_finup(&ctx->req);
135 err = crypto_ahash_digest(&ctx->req);
138 err = crypto_ahash_init(&ctx->req);
143 err = crypto_ahash_update(&ctx->req);
146 err = af_alg_wait_for_completion(err, &ctx->completion);
150 ctx->more = flags & MSG_MORE;
158 static int hash_recvmsg(struct kiocb *unused, struct socket *sock,
159 struct msghdr *msg, size_t len, int flags)
161 struct sock *sk = sock->sk;
162 struct alg_sock *ask = alg_sk(sk);
163 struct hash_ctx *ctx = ask->private;
164 unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
170 msg->msg_flags |= MSG_TRUNC;
175 ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
176 err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
182 err = memcpy_toiovec(msg->msg_iov, ctx->result, len);
190 static int hash_accept(struct socket *sock, struct socket *newsock, int flags)
192 struct sock *sk = sock->sk;
193 struct alg_sock *ask = alg_sk(sk);
194 struct hash_ctx *ctx = ask->private;
195 struct ahash_request *req = &ctx->req;
196 char state[crypto_ahash_statesize(crypto_ahash_reqtfm(req))];
198 struct alg_sock *ask2;
199 struct hash_ctx *ctx2;
205 err = more ? crypto_ahash_export(req, state) : 0;
211 err = af_alg_accept(ask->parent, newsock);
217 ctx2 = ask2->private;
223 err = crypto_ahash_import(&ctx2->req, state);
232 static struct proto_ops algif_hash_ops = {
235 .connect = sock_no_connect,
236 .socketpair = sock_no_socketpair,
237 .getname = sock_no_getname,
238 .ioctl = sock_no_ioctl,
239 .listen = sock_no_listen,
240 .shutdown = sock_no_shutdown,
241 .getsockopt = sock_no_getsockopt,
242 .mmap = sock_no_mmap,
243 .bind = sock_no_bind,
244 .setsockopt = sock_no_setsockopt,
245 .poll = sock_no_poll,
247 .release = af_alg_release,
248 .sendmsg = hash_sendmsg,
249 .sendpage = hash_sendpage,
250 .recvmsg = hash_recvmsg,
251 .accept = hash_accept,
254 static int hash_check_key(struct socket *sock)
258 struct alg_sock *pask;
259 struct algif_hash_tfm *tfm;
260 struct sock *sk = sock->sk;
261 struct alg_sock *ask = alg_sk(sk);
268 pask = alg_sk(ask->parent);
272 lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
292 static int hash_sendmsg_nokey(struct kiocb *unused, struct socket *sock,
293 struct msghdr *msg, size_t size)
297 err = hash_check_key(sock);
301 return hash_sendmsg(unused, sock, msg, size);
304 static ssize_t hash_sendpage_nokey(struct socket *sock, struct page *page,
305 int offset, size_t size, int flags)
309 err = hash_check_key(sock);
313 return hash_sendpage(sock, page, offset, size, flags);
316 static int hash_recvmsg_nokey(struct kiocb *unused, struct socket *sock,
317 struct msghdr *msg, size_t ignored, int flags)
321 err = hash_check_key(sock);
325 return hash_recvmsg(unused, sock, msg, ignored, flags);
328 static int hash_accept_nokey(struct socket *sock, struct socket *newsock,
333 err = hash_check_key(sock);
337 return hash_accept(sock, newsock, flags);
340 static struct proto_ops algif_hash_ops_nokey = {
343 .connect = sock_no_connect,
344 .socketpair = sock_no_socketpair,
345 .getname = sock_no_getname,
346 .ioctl = sock_no_ioctl,
347 .listen = sock_no_listen,
348 .shutdown = sock_no_shutdown,
349 .getsockopt = sock_no_getsockopt,
350 .mmap = sock_no_mmap,
351 .bind = sock_no_bind,
352 .setsockopt = sock_no_setsockopt,
353 .poll = sock_no_poll,
355 .release = af_alg_release,
356 .sendmsg = hash_sendmsg_nokey,
357 .sendpage = hash_sendpage_nokey,
358 .recvmsg = hash_recvmsg_nokey,
359 .accept = hash_accept_nokey,
362 static void *hash_bind(const char *name, u32 type, u32 mask)
364 struct algif_hash_tfm *tfm;
365 struct crypto_ahash *hash;
367 tfm = kzalloc(sizeof(*tfm), GFP_KERNEL);
369 return ERR_PTR(-ENOMEM);
371 hash = crypto_alloc_ahash(name, type, mask);
374 return ERR_CAST(hash);
382 static void hash_release(void *private)
384 struct algif_hash_tfm *tfm = private;
386 crypto_free_ahash(tfm->hash);
390 static int hash_setkey(void *private, const u8 *key, unsigned int keylen)
392 struct algif_hash_tfm *tfm = private;
395 err = crypto_ahash_setkey(tfm->hash, key, keylen);
401 static void hash_sock_destruct(struct sock *sk)
403 struct alg_sock *ask = alg_sk(sk);
404 struct hash_ctx *ctx = ask->private;
406 sock_kfree_s(sk, ctx->result,
407 crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req)));
408 sock_kfree_s(sk, ctx, ctx->len);
409 af_alg_release_parent(sk);
412 static int hash_accept_parent_nokey(void *private, struct sock *sk)
414 struct hash_ctx *ctx;
415 struct alg_sock *ask = alg_sk(sk);
416 struct algif_hash_tfm *tfm = private;
417 struct crypto_ahash *hash = tfm->hash;
418 unsigned len = sizeof(*ctx) + crypto_ahash_reqsize(hash);
419 unsigned ds = crypto_ahash_digestsize(hash);
421 ctx = sock_kmalloc(sk, len, GFP_KERNEL);
425 ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
427 sock_kfree_s(sk, ctx, len);
431 memset(ctx->result, 0, ds);
435 af_alg_init_completion(&ctx->completion);
439 ahash_request_set_tfm(&ctx->req, hash);
440 ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
441 af_alg_complete, &ctx->completion);
443 sk->sk_destruct = hash_sock_destruct;
448 static int hash_accept_parent(void *private, struct sock *sk)
450 struct algif_hash_tfm *tfm = private;
452 if (!tfm->has_key && crypto_ahash_has_setkey(tfm->hash))
455 return hash_accept_parent_nokey(private, sk);
458 static const struct af_alg_type algif_type_hash = {
460 .release = hash_release,
461 .setkey = hash_setkey,
462 .accept = hash_accept_parent,
463 .accept_nokey = hash_accept_parent_nokey,
464 .ops = &algif_hash_ops,
465 .ops_nokey = &algif_hash_ops_nokey,
470 static int __init algif_hash_init(void)
472 return af_alg_register_type(&algif_type_hash);
475 static void __exit algif_hash_exit(void)
477 int err = af_alg_unregister_type(&algif_type_hash);
481 module_init(algif_hash_init);
482 module_exit(algif_hash_exit);
483 MODULE_LICENSE("GPL");