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 socket *sock, struct msghdr *msg,
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;
52 if (limit > sk->sk_sndbuf)
53 limit = sk->sk_sndbuf;
57 err = crypto_ahash_init(&ctx->req);
64 while (msg_data_left(msg)) {
65 int len = msg_data_left(msg);
70 len = af_alg_make_sg(&ctx->sgl, &msg->msg_iter, len);
72 err = copied ? 0 : len;
76 ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, len);
78 err = af_alg_wait_for_completion(crypto_ahash_update(&ctx->req),
80 af_alg_free_sg(&ctx->sgl);
85 iov_iter_advance(&msg->msg_iter, len);
90 ctx->more = msg->msg_flags & MSG_MORE;
92 ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
93 err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
100 return err ?: copied;
103 static ssize_t hash_sendpage(struct socket *sock, struct page *page,
104 int offset, size_t size, int flags)
106 struct sock *sk = sock->sk;
107 struct alg_sock *ask = alg_sk(sk);
108 struct hash_ctx *ctx = ask->private;
111 if (flags & MSG_SENDPAGE_NOTLAST)
115 sg_init_table(ctx->sgl.sg, 1);
116 sg_set_page(ctx->sgl.sg, page, size, offset);
118 ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size);
120 if (!(flags & MSG_MORE)) {
122 err = crypto_ahash_finup(&ctx->req);
124 err = crypto_ahash_digest(&ctx->req);
127 err = crypto_ahash_init(&ctx->req);
132 err = crypto_ahash_update(&ctx->req);
135 err = af_alg_wait_for_completion(err, &ctx->completion);
139 ctx->more = flags & MSG_MORE;
147 static int hash_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
150 struct sock *sk = sock->sk;
151 struct alg_sock *ask = alg_sk(sk);
152 struct hash_ctx *ctx = ask->private;
153 unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
159 msg->msg_flags |= MSG_TRUNC;
164 ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
165 err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
171 err = memcpy_to_msg(msg, ctx->result, len);
179 static int hash_accept(struct socket *sock, struct socket *newsock, int flags)
181 struct sock *sk = sock->sk;
182 struct alg_sock *ask = alg_sk(sk);
183 struct hash_ctx *ctx = ask->private;
184 struct ahash_request *req = &ctx->req;
185 char state[crypto_ahash_statesize(crypto_ahash_reqtfm(req))];
187 struct alg_sock *ask2;
188 struct hash_ctx *ctx2;
194 err = more ? crypto_ahash_export(req, state) : 0;
200 err = af_alg_accept(ask->parent, newsock);
206 ctx2 = ask2->private;
212 err = crypto_ahash_import(&ctx2->req, state);
221 static struct proto_ops algif_hash_ops = {
224 .connect = sock_no_connect,
225 .socketpair = sock_no_socketpair,
226 .getname = sock_no_getname,
227 .ioctl = sock_no_ioctl,
228 .listen = sock_no_listen,
229 .shutdown = sock_no_shutdown,
230 .getsockopt = sock_no_getsockopt,
231 .mmap = sock_no_mmap,
232 .bind = sock_no_bind,
233 .setsockopt = sock_no_setsockopt,
234 .poll = sock_no_poll,
236 .release = af_alg_release,
237 .sendmsg = hash_sendmsg,
238 .sendpage = hash_sendpage,
239 .recvmsg = hash_recvmsg,
240 .accept = hash_accept,
243 static int hash_check_key(struct socket *sock)
247 struct alg_sock *pask;
248 struct algif_hash_tfm *tfm;
249 struct sock *sk = sock->sk;
250 struct alg_sock *ask = alg_sk(sk);
257 pask = alg_sk(ask->parent);
261 lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
281 static int hash_sendmsg_nokey(struct socket *sock, struct msghdr *msg,
286 err = hash_check_key(sock);
290 return hash_sendmsg(sock, msg, size);
293 static ssize_t hash_sendpage_nokey(struct socket *sock, struct page *page,
294 int offset, size_t size, int flags)
298 err = hash_check_key(sock);
302 return hash_sendpage(sock, page, offset, size, flags);
305 static int hash_recvmsg_nokey(struct socket *sock, struct msghdr *msg,
306 size_t ignored, int flags)
310 err = hash_check_key(sock);
314 return hash_recvmsg(sock, msg, ignored, flags);
317 static int hash_accept_nokey(struct socket *sock, struct socket *newsock,
322 err = hash_check_key(sock);
326 return hash_accept(sock, newsock, flags);
329 static struct proto_ops algif_hash_ops_nokey = {
332 .connect = sock_no_connect,
333 .socketpair = sock_no_socketpair,
334 .getname = sock_no_getname,
335 .ioctl = sock_no_ioctl,
336 .listen = sock_no_listen,
337 .shutdown = sock_no_shutdown,
338 .getsockopt = sock_no_getsockopt,
339 .mmap = sock_no_mmap,
340 .bind = sock_no_bind,
341 .setsockopt = sock_no_setsockopt,
342 .poll = sock_no_poll,
344 .release = af_alg_release,
345 .sendmsg = hash_sendmsg_nokey,
346 .sendpage = hash_sendpage_nokey,
347 .recvmsg = hash_recvmsg_nokey,
348 .accept = hash_accept_nokey,
351 static void *hash_bind(const char *name, u32 type, u32 mask)
353 struct algif_hash_tfm *tfm;
354 struct crypto_ahash *hash;
356 tfm = kzalloc(sizeof(*tfm), GFP_KERNEL);
358 return ERR_PTR(-ENOMEM);
360 hash = crypto_alloc_ahash(name, type, mask);
363 return ERR_CAST(hash);
371 static void hash_release(void *private)
373 struct algif_hash_tfm *tfm = private;
375 crypto_free_ahash(tfm->hash);
379 static int hash_setkey(void *private, const u8 *key, unsigned int keylen)
381 struct algif_hash_tfm *tfm = private;
384 err = crypto_ahash_setkey(tfm->hash, key, keylen);
390 static void hash_sock_destruct(struct sock *sk)
392 struct alg_sock *ask = alg_sk(sk);
393 struct hash_ctx *ctx = ask->private;
395 sock_kzfree_s(sk, ctx->result,
396 crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req)));
397 sock_kfree_s(sk, ctx, ctx->len);
398 af_alg_release_parent(sk);
401 static int hash_accept_parent_nokey(void *private, struct sock *sk)
403 struct hash_ctx *ctx;
404 struct alg_sock *ask = alg_sk(sk);
405 struct algif_hash_tfm *tfm = private;
406 struct crypto_ahash *hash = tfm->hash;
407 unsigned len = sizeof(*ctx) + crypto_ahash_reqsize(hash);
408 unsigned ds = crypto_ahash_digestsize(hash);
410 ctx = sock_kmalloc(sk, len, GFP_KERNEL);
414 ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
416 sock_kfree_s(sk, ctx, len);
420 memset(ctx->result, 0, ds);
424 af_alg_init_completion(&ctx->completion);
428 ahash_request_set_tfm(&ctx->req, hash);
429 ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
430 af_alg_complete, &ctx->completion);
432 sk->sk_destruct = hash_sock_destruct;
437 static int hash_accept_parent(void *private, struct sock *sk)
439 struct algif_hash_tfm *tfm = private;
441 if (!tfm->has_key && crypto_ahash_has_setkey(tfm->hash))
444 return hash_accept_parent_nokey(private, sk);
447 static const struct af_alg_type algif_type_hash = {
449 .release = hash_release,
450 .setkey = hash_setkey,
451 .accept = hash_accept_parent,
452 .accept_nokey = hash_accept_parent_nokey,
453 .ops = &algif_hash_ops,
454 .ops_nokey = &algif_hash_ops_nokey,
459 static int __init algif_hash_init(void)
461 return af_alg_register_type(&algif_type_hash);
464 static void __exit algif_hash_exit(void)
466 int err = af_alg_unregister_type(&algif_type_hash);
470 module_init(algif_hash_init);
471 module_exit(algif_hash_exit);
472 MODULE_LICENSE("GPL");