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 static int hash_sendmsg(struct socket *sock, struct msghdr *msg,
40 int limit = ALG_MAX_PAGES * PAGE_SIZE;
41 struct sock *sk = sock->sk;
42 struct alg_sock *ask = alg_sk(sk);
43 struct hash_ctx *ctx = ask->private;
47 if (limit > sk->sk_sndbuf)
48 limit = sk->sk_sndbuf;
52 err = crypto_ahash_init(&ctx->req);
59 while (msg_data_left(msg)) {
60 int len = msg_data_left(msg);
65 len = af_alg_make_sg(&ctx->sgl, &msg->msg_iter, len);
67 err = copied ? 0 : len;
71 ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, len);
73 err = af_alg_wait_for_completion(crypto_ahash_update(&ctx->req),
75 af_alg_free_sg(&ctx->sgl);
80 iov_iter_advance(&msg->msg_iter, len);
85 ctx->more = msg->msg_flags & MSG_MORE;
87 ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
88 err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
98 static ssize_t hash_sendpage(struct socket *sock, struct page *page,
99 int offset, size_t size, int flags)
101 struct sock *sk = sock->sk;
102 struct alg_sock *ask = alg_sk(sk);
103 struct hash_ctx *ctx = ask->private;
106 if (flags & MSG_SENDPAGE_NOTLAST)
110 sg_init_table(ctx->sgl.sg, 1);
111 sg_set_page(ctx->sgl.sg, page, size, offset);
113 ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size);
115 if (!(flags & MSG_MORE)) {
117 err = crypto_ahash_finup(&ctx->req);
119 err = crypto_ahash_digest(&ctx->req);
122 err = crypto_ahash_init(&ctx->req);
127 err = crypto_ahash_update(&ctx->req);
130 err = af_alg_wait_for_completion(err, &ctx->completion);
134 ctx->more = flags & MSG_MORE;
142 static int hash_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
145 struct sock *sk = sock->sk;
146 struct alg_sock *ask = alg_sk(sk);
147 struct hash_ctx *ctx = ask->private;
148 unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
154 msg->msg_flags |= MSG_TRUNC;
159 ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
160 err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
166 err = memcpy_to_msg(msg, ctx->result, len);
174 static int hash_accept(struct socket *sock, struct socket *newsock, int flags)
176 struct sock *sk = sock->sk;
177 struct alg_sock *ask = alg_sk(sk);
178 struct hash_ctx *ctx = ask->private;
179 struct ahash_request *req = &ctx->req;
180 char state[crypto_ahash_statesize(crypto_ahash_reqtfm(req))];
182 struct alg_sock *ask2;
183 struct hash_ctx *ctx2;
189 err = more ? crypto_ahash_export(req, state) : 0;
195 err = af_alg_accept(ask->parent, newsock);
201 ctx2 = ask2->private;
207 err = crypto_ahash_import(&ctx2->req, state);
216 static struct proto_ops algif_hash_ops = {
219 .connect = sock_no_connect,
220 .socketpair = sock_no_socketpair,
221 .getname = sock_no_getname,
222 .ioctl = sock_no_ioctl,
223 .listen = sock_no_listen,
224 .shutdown = sock_no_shutdown,
225 .getsockopt = sock_no_getsockopt,
226 .mmap = sock_no_mmap,
227 .bind = sock_no_bind,
228 .setsockopt = sock_no_setsockopt,
229 .poll = sock_no_poll,
231 .release = af_alg_release,
232 .sendmsg = hash_sendmsg,
233 .sendpage = hash_sendpage,
234 .recvmsg = hash_recvmsg,
235 .accept = hash_accept,
238 static void *hash_bind(const char *name, u32 type, u32 mask)
240 return crypto_alloc_ahash(name, type, mask);
243 static void hash_release(void *private)
245 crypto_free_ahash(private);
248 static int hash_setkey(void *private, const u8 *key, unsigned int keylen)
250 return crypto_ahash_setkey(private, key, keylen);
253 static void hash_sock_destruct(struct sock *sk)
255 struct alg_sock *ask = alg_sk(sk);
256 struct hash_ctx *ctx = ask->private;
258 sock_kzfree_s(sk, ctx->result,
259 crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req)));
260 sock_kfree_s(sk, ctx, ctx->len);
261 af_alg_release_parent(sk);
264 static int hash_accept_parent(void *private, struct sock *sk)
266 struct hash_ctx *ctx;
267 struct alg_sock *ask = alg_sk(sk);
268 unsigned len = sizeof(*ctx) + crypto_ahash_reqsize(private);
269 unsigned ds = crypto_ahash_digestsize(private);
271 ctx = sock_kmalloc(sk, len, GFP_KERNEL);
275 ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
277 sock_kfree_s(sk, ctx, len);
281 memset(ctx->result, 0, ds);
285 af_alg_init_completion(&ctx->completion);
289 ahash_request_set_tfm(&ctx->req, private);
290 ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
291 af_alg_complete, &ctx->completion);
293 sk->sk_destruct = hash_sock_destruct;
298 static const struct af_alg_type algif_type_hash = {
300 .release = hash_release,
301 .setkey = hash_setkey,
302 .accept = hash_accept_parent,
303 .ops = &algif_hash_ops,
308 static int __init algif_hash_init(void)
310 return af_alg_register_type(&algif_type_hash);
313 static void __exit algif_hash_exit(void)
315 int err = af_alg_unregister_type(&algif_type_hash);
319 module_init(algif_hash_init);
320 module_exit(algif_hash_exit);
321 MODULE_LICENSE("GPL");