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);
256 pask = alg_sk(ask->parent);
278 static int hash_sendmsg_nokey(struct socket *sock, struct msghdr *msg,
283 err = hash_check_key(sock);
287 return hash_sendmsg(sock, msg, size);
290 static ssize_t hash_sendpage_nokey(struct socket *sock, struct page *page,
291 int offset, size_t size, int flags)
295 err = hash_check_key(sock);
299 return hash_sendpage(sock, page, offset, size, flags);
302 static int hash_recvmsg_nokey(struct socket *sock, struct msghdr *msg,
303 size_t ignored, int flags)
307 err = hash_check_key(sock);
311 return hash_recvmsg(sock, msg, ignored, flags);
314 static int hash_accept_nokey(struct socket *sock, struct socket *newsock,
319 err = hash_check_key(sock);
323 return hash_accept(sock, newsock, flags);
326 static struct proto_ops algif_hash_ops_nokey = {
329 .connect = sock_no_connect,
330 .socketpair = sock_no_socketpair,
331 .getname = sock_no_getname,
332 .ioctl = sock_no_ioctl,
333 .listen = sock_no_listen,
334 .shutdown = sock_no_shutdown,
335 .getsockopt = sock_no_getsockopt,
336 .mmap = sock_no_mmap,
337 .bind = sock_no_bind,
338 .setsockopt = sock_no_setsockopt,
339 .poll = sock_no_poll,
341 .release = af_alg_release,
342 .sendmsg = hash_sendmsg_nokey,
343 .sendpage = hash_sendpage_nokey,
344 .recvmsg = hash_recvmsg_nokey,
345 .accept = hash_accept_nokey,
348 static void *hash_bind(const char *name, u32 type, u32 mask)
350 struct algif_hash_tfm *tfm;
351 struct crypto_ahash *hash;
353 tfm = kzalloc(sizeof(*tfm), GFP_KERNEL);
355 return ERR_PTR(-ENOMEM);
357 hash = crypto_alloc_ahash(name, type, mask);
360 return ERR_CAST(hash);
368 static void hash_release(void *private)
370 struct algif_hash_tfm *tfm = private;
372 crypto_free_ahash(tfm->hash);
376 static int hash_setkey(void *private, const u8 *key, unsigned int keylen)
378 struct algif_hash_tfm *tfm = private;
381 err = crypto_ahash_setkey(tfm->hash, key, keylen);
387 static void hash_sock_destruct_common(struct sock *sk)
389 struct alg_sock *ask = alg_sk(sk);
390 struct hash_ctx *ctx = ask->private;
392 sock_kzfree_s(sk, ctx->result,
393 crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req)));
394 sock_kfree_s(sk, ctx, ctx->len);
397 static void hash_sock_destruct(struct sock *sk)
399 hash_sock_destruct_common(sk);
400 af_alg_release_parent(sk);
403 static void hash_release_parent_nokey(struct sock *sk)
405 struct alg_sock *ask = alg_sk(sk);
408 sock_put(ask->parent);
412 af_alg_release_parent(sk);
415 static void hash_sock_destruct_nokey(struct sock *sk)
417 hash_sock_destruct_common(sk);
418 hash_release_parent_nokey(sk);
421 static int hash_accept_parent_common(void *private, struct sock *sk)
423 struct hash_ctx *ctx;
424 struct alg_sock *ask = alg_sk(sk);
425 struct algif_hash_tfm *tfm = private;
426 struct crypto_ahash *hash = tfm->hash;
427 unsigned len = sizeof(*ctx) + crypto_ahash_reqsize(hash);
428 unsigned ds = crypto_ahash_digestsize(hash);
430 ctx = sock_kmalloc(sk, len, GFP_KERNEL);
434 ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
436 sock_kfree_s(sk, ctx, len);
440 memset(ctx->result, 0, ds);
444 af_alg_init_completion(&ctx->completion);
448 ahash_request_set_tfm(&ctx->req, hash);
449 ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
450 af_alg_complete, &ctx->completion);
452 sk->sk_destruct = hash_sock_destruct;
457 static int hash_accept_parent(void *private, struct sock *sk)
459 struct algif_hash_tfm *tfm = private;
461 if (!tfm->has_key && crypto_ahash_has_setkey(tfm->hash))
464 return hash_accept_parent_common(private, sk);
467 static int hash_accept_parent_nokey(void *private, struct sock *sk)
471 err = hash_accept_parent_common(private, sk);
475 sk->sk_destruct = hash_sock_destruct_nokey;
481 static const struct af_alg_type algif_type_hash = {
483 .release = hash_release,
484 .setkey = hash_setkey,
485 .accept = hash_accept_parent,
486 .accept_nokey = hash_accept_parent_nokey,
487 .ops = &algif_hash_ops,
488 .ops_nokey = &algif_hash_ops_nokey,
493 static int __init algif_hash_init(void)
495 return af_alg_register_type(&algif_type_hash);
498 static void __exit algif_hash_exit(void)
500 int err = af_alg_unregister_type(&algif_type_hash);
504 module_init(algif_hash_init);
505 module_exit(algif_hash_exit);
506 MODULE_LICENSE("GPL");