[linux-2.6-block.git] / crypto / algif_hash.c

/*
 * algif_hash: User-space interface for hash algorithms
 *
 * This file provides the user-space API for hash algorithms.
 *
 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 */

#include <crypto/hash.h>
#include <crypto/if_alg.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/net.h>
#include <net/sock.h>

struct hash_ctx {
	struct af_alg_sgl sgl;

	u8 *result;

	struct af_alg_completion completion;

	unsigned int len;
	bool more;

	struct ahash_request req;
};

struct algif_hash_tfm {
	struct crypto_ahash *hash;
	bool has_key;
};

static int hash_sendmsg(struct socket *sock, struct msghdr *msg,
			size_t ignored)
{
	int limit = ALG_MAX_PAGES * PAGE_SIZE;
	struct sock *sk = sock->sk;
	struct alg_sock *ask = alg_sk(sk);
	struct hash_ctx *ctx = ask->private;
	long copied = 0;
	int err;

	if (limit > sk->sk_sndbuf)
		limit = sk->sk_sndbuf;

	lock_sock(sk);
	if (!ctx->more) {
		err = af_alg_wait_for_completion(crypto_ahash_init(&ctx->req),
						&ctx->completion);
		if (err)
			goto unlock;
	}

	ctx->more = 0;

	while (msg_data_left(msg)) {
		int len = msg_data_left(msg);

		if (len > limit)
			len = limit;

		len = af_alg_make_sg(&ctx->sgl, &msg->msg_iter, len);
		if (len < 0) {
			err = copied ? 0 : len;
			goto unlock;
		}

		ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, len);

		err = af_alg_wait_for_completion(crypto_ahash_update(&ctx->req),
						 &ctx->completion);
		af_alg_free_sg(&ctx->sgl);
		if (err)
			goto unlock;

		copied += len;
		iov_iter_advance(&msg->msg_iter, len);
	}

	err = 0;

	ctx->more = msg->msg_flags & MSG_MORE;
	if (!ctx->more) {
		ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
		err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
						 &ctx->completion);
	}

unlock:
	release_sock(sk);

	return err ?: copied;
}

static ssize_t hash_sendpage(struct socket *sock, struct page *page,
			     int offset, size_t size, int flags)
{
	struct sock *sk = sock->sk;
	struct alg_sock *ask = alg_sk(sk);
	struct hash_ctx *ctx = ask->private;
	int err;

	if (flags & MSG_SENDPAGE_NOTLAST)
		flags |= MSG_MORE;

	lock_sock(sk);
	sg_init_table(ctx->sgl.sg, 1);
	sg_set_page(ctx->sgl.sg, page, size, offset);

	ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size);

	if (!(flags & MSG_MORE)) {
		if (ctx->more)
			err = crypto_ahash_finup(&ctx->req);
		else
			err = crypto_ahash_digest(&ctx->req);
	} else {
		if (!ctx->more) {
			err = crypto_ahash_init(&ctx->req);
			err = af_alg_wait_for_completion(err, &ctx->completion);
			if (err)
				goto unlock;
		}

		err = crypto_ahash_update(&ctx->req);
	}

	err = af_alg_wait_for_completion(err, &ctx->completion);
	if (err)
		goto unlock;

	ctx->more = flags & MSG_MORE;

unlock:
	release_sock(sk);

	return err ?: size;
}

static int hash_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
			int flags)
{
	struct sock *sk = sock->sk;
	struct alg_sock *ask = alg_sk(sk);
	struct hash_ctx *ctx = ask->private;
	unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
	int err;

	if (len > ds)
		len = ds;
	else if (len < ds)
		msg->msg_flags |= MSG_TRUNC;

	lock_sock(sk);
	if (ctx->more) {
		ctx->more = 0;
		ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
		err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
						 &ctx->completion);
		if (err)
			goto unlock;
	}

	err = memcpy_to_msg(msg, ctx->result, len);

unlock:
	release_sock(sk);

	return err ?: len;
}

static int hash_accept(struct socket *sock, struct socket *newsock, int flags)
{
	struct sock *sk = sock->sk;
	struct alg_sock *ask = alg_sk(sk);
	struct hash_ctx *ctx = ask->private;
	struct ahash_request *req = &ctx->req;
	char state[crypto_ahash_statesize(crypto_ahash_reqtfm(req))];
	struct sock *sk2;
	struct alg_sock *ask2;
	struct hash_ctx *ctx2;
	bool more;
	int err;

	lock_sock(sk);
	more = ctx->more;
	err = more ? crypto_ahash_export(req, state) : 0;
	release_sock(sk);

	if (err)
		return err;

	err = af_alg_accept(ask->parent, newsock);
	if (err)
		return err;

	sk2 = newsock->sk;
	ask2 = alg_sk(sk2);
	ctx2 = ask2->private;
	ctx2->more = more;

	if (!more)
		return err;

	err = crypto_ahash_import(&ctx2->req, state);
	if (err) {
		sock_orphan(sk2);
		sock_put(sk2);
	}

	return err;
}

static struct proto_ops algif_hash_ops = {
	.family		=	PF_ALG,

	.connect	=	sock_no_connect,
	.socketpair	=	sock_no_socketpair,
	.getname	=	sock_no_getname,
	.ioctl		=	sock_no_ioctl,
	.listen		=	sock_no_listen,
	.shutdown	=	sock_no_shutdown,
	.getsockopt	=	sock_no_getsockopt,
	.mmap		=	sock_no_mmap,
	.bind		=	sock_no_bind,
	.setsockopt	=	sock_no_setsockopt,
	.poll		=	sock_no_poll,

	.release	=	af_alg_release,
	.sendmsg	=	hash_sendmsg,
	.sendpage	=	hash_sendpage,
	.recvmsg	=	hash_recvmsg,
	.accept		=	hash_accept,
};

static int hash_check_key(struct socket *sock)
{
	int err = 0;
	struct sock *psk;
	struct alg_sock *pask;
	struct algif_hash_tfm *tfm;
	struct sock *sk = sock->sk;
	struct alg_sock *ask = alg_sk(sk);

	lock_sock(sk);
	if (ask->refcnt)
		goto unlock_child;

	psk = ask->parent;
	pask = alg_sk(ask->parent);
	tfm = pask->private;

	err = -ENOKEY;
	lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
	if (!tfm->has_key)
		goto unlock;

	if (!pask->refcnt++)
		sock_hold(psk);

	ask->refcnt = 1;
	sock_put(psk);

	err = 0;

unlock:
	release_sock(psk);
unlock_child:
	release_sock(sk);

	return err;
}

static int hash_sendmsg_nokey(struct socket *sock, struct msghdr *msg,
			      size_t size)
{
	int err;

	err = hash_check_key(sock);
	if (err)
		return err;

	return hash_sendmsg(sock, msg, size);
}

static ssize_t hash_sendpage_nokey(struct socket *sock, struct page *page,
				   int offset, size_t size, int flags)
{
	int err;

	err = hash_check_key(sock);
	if (err)
		return err;

	return hash_sendpage(sock, page, offset, size, flags);
}

static int hash_recvmsg_nokey(struct socket *sock, struct msghdr *msg,
			      size_t ignored, int flags)
{
	int err;

	err = hash_check_key(sock);
	if (err)
		return err;

	return hash_recvmsg(sock, msg, ignored, flags);
}

static int hash_accept_nokey(struct socket *sock, struct socket *newsock,
			     int flags)
{
	int err;

	err = hash_check_key(sock);
	if (err)
		return err;

	return hash_accept(sock, newsock, flags);
}

static struct proto_ops algif_hash_ops_nokey = {
	.family		=	PF_ALG,

	.connect	=	sock_no_connect,
	.socketpair	=	sock_no_socketpair,
	.getname	=	sock_no_getname,
	.ioctl		=	sock_no_ioctl,
	.listen		=	sock_no_listen,
	.shutdown	=	sock_no_shutdown,
	.getsockopt	=	sock_no_getsockopt,
	.mmap		=	sock_no_mmap,
	.bind		=	sock_no_bind,
	.setsockopt	=	sock_no_setsockopt,
	.poll		=	sock_no_poll,

	.release	=	af_alg_release,
	.sendmsg	=	hash_sendmsg_nokey,
	.sendpage	=	hash_sendpage_nokey,
	.recvmsg	=	hash_recvmsg_nokey,
	.accept		=	hash_accept_nokey,
};

static void *hash_bind(const char *name, u32 type, u32 mask)
{
	struct algif_hash_tfm *tfm;
	struct crypto_ahash *hash;

	tfm = kzalloc(sizeof(*tfm), GFP_KERNEL);
	if (!tfm)
		return ERR_PTR(-ENOMEM);

	hash = crypto_alloc_ahash(name, type, mask);
	if (IS_ERR(hash)) {
		kfree(tfm);
		return ERR_CAST(hash);
	}

	tfm->hash = hash;

	return tfm;
}

static void hash_release(void *private)
{
	struct algif_hash_tfm *tfm = private;

	crypto_free_ahash(tfm->hash);
	kfree(tfm);
}

static int hash_setkey(void *private, const u8 *key, unsigned int keylen)
{
	struct algif_hash_tfm *tfm = private;
	int err;

	err = crypto_ahash_setkey(tfm->hash, key, keylen);
	tfm->has_key = !err;

	return err;
}

static void hash_sock_destruct(struct sock *sk)
{
	struct alg_sock *ask = alg_sk(sk);
	struct hash_ctx *ctx = ask->private;

	sock_kzfree_s(sk, ctx->result,
		      crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req)));
	sock_kfree_s(sk, ctx, ctx->len);
	af_alg_release_parent(sk);
}

static int hash_accept_parent_nokey(void *private, struct sock *sk)
{
	struct hash_ctx *ctx;
	struct alg_sock *ask = alg_sk(sk);
	struct algif_hash_tfm *tfm = private;
	struct crypto_ahash *hash = tfm->hash;
	unsigned len = sizeof(*ctx) + crypto_ahash_reqsize(hash);
	unsigned ds = crypto_ahash_digestsize(hash);

	ctx = sock_kmalloc(sk, len, GFP_KERNEL);
	if (!ctx)
		return -ENOMEM;

	ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
	if (!ctx->result) {
		sock_kfree_s(sk, ctx, len);
		return -ENOMEM;
	}

	memset(ctx->result, 0, ds);

	ctx->len = len;
	ctx->more = 0;
	af_alg_init_completion(&ctx->completion);

	ask->private = ctx;

	ahash_request_set_tfm(&ctx->req, hash);
	ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
				   af_alg_complete, &ctx->completion);

	sk->sk_destruct = hash_sock_destruct;

	return 0;
}

static int hash_accept_parent(void *private, struct sock *sk)
{
	struct algif_hash_tfm *tfm = private;

	if (!tfm->has_key && crypto_ahash_has_setkey(tfm->hash))
		return -ENOKEY;

	return hash_accept_parent_nokey(private, sk);
}

static const struct af_alg_type algif_type_hash = {
	.bind		=	hash_bind,
	.release	=	hash_release,
	.setkey		=	hash_setkey,
	.accept		=	hash_accept_parent,
	.accept_nokey	=	hash_accept_parent_nokey,
	.ops		=	&algif_hash_ops,
	.ops_nokey	=	&algif_hash_ops_nokey,
	.name		=	"hash",
	.owner		=	THIS_MODULE
};

static int __init algif_hash_init(void)
{
	return af_alg_register_type(&algif_type_hash);
}

static void __exit algif_hash_exit(void)
{
	int err = af_alg_unregister_type(&algif_type_hash);
	BUG_ON(err);
}

module_init(algif_hash_init);
module_exit(algif_hash_exit);
MODULE_LICENSE("GPL");
Commit	Line	Data
fe869cdb HX	1	/*
	2	* algif_hash: User-space interface for hash algorithms
	3	*
	4	* This file provides the user-space API for hash algorithms.
	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/hash.h>
	16	#include <crypto/if_alg.h>
	17	#include <linux/init.h>
	18	#include <linux/kernel.h>
	19	#include <linux/mm.h>
	20	#include <linux/module.h>
	21	#include <linux/net.h>
	22	#include <net/sock.h>
	23
	24	struct hash_ctx {
	25	struct af_alg_sgl sgl;
	26
	27	u8 *result;
	28
	29	struct af_alg_completion completion;
	30
	31	unsigned int len;
	32	bool more;
	33
	34	struct ahash_request req;
	35	};
	36
6de62f15 HX	37	struct algif_hash_tfm {
	38	struct crypto_ahash *hash;
	39	bool has_key;
	40	};
	41
1b784140 YX	42	static int hash_sendmsg(struct socket sock, struct msghdr msg,
1b784140 YX	43	size_t ignored)
fe869cdb HX	44	{
	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;
fe869cdb HX	49	long copied = 0;
	50	int err;
	51
	52	if (limit > sk->sk_sndbuf)
	53	limit = sk->sk_sndbuf;
	54
	55	lock_sock(sk);
	56	if (!ctx->more) {
fe097861 WR	57	err = af_alg_wait_for_completion(crypto_ahash_init(&ctx->req),
fe097861 WR	58	&ctx->completion);
fe869cdb HX	59	if (err)
	60	goto unlock;
	61	}
	62
	63	ctx->more = 0;
	64
01e97e65 AV	65	while (msg_data_left(msg)) {
01e97e65 AV	66	int len = msg_data_left(msg);
fe869cdb	67
1d10eb2f AV	68	if (len > limit)
1d10eb2f AV	69	len = limit;
fe869cdb	70
1d10eb2f AV	71	len = af_alg_make_sg(&ctx->sgl, &msg->msg_iter, len);
	72	if (len < 0) {
	73	err = copied ? 0 : len;
	74	goto unlock;
	75	}
fe869cdb	76
1d10eb2f	77	ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, len);
fe869cdb	78
1d10eb2f AV	79	err = af_alg_wait_for_completion(crypto_ahash_update(&ctx->req),
	80	&ctx->completion);
	81	af_alg_free_sg(&ctx->sgl);
	82	if (err)
	83	goto unlock;
fe869cdb	84
1d10eb2f AV	85	copied += len;
1d10eb2f AV	86	iov_iter_advance(&msg->msg_iter, len);
fe869cdb HX	87	}
	88
	89	err = 0;
	90
	91	ctx->more = msg->msg_flags & MSG_MORE;
	92	if (!ctx->more) {
	93	ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
	94	err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
	95	&ctx->completion);
	96	}
	97
	98	unlock:
	99	release_sock(sk);
	100
	101	return err ?: copied;
	102	}
	103
	104	static ssize_t hash_sendpage(struct socket sock, struct page page,
	105	int offset, size_t size, int flags)
	106	{
	107	struct sock *sk = sock->sk;
	108	struct alg_sock *ask = alg_sk(sk);
	109	struct hash_ctx *ctx = ask->private;
	110	int err;
	111
d3f7d56a SL	112	if (flags & MSG_SENDPAGE_NOTLAST)
	113	flags \|= MSG_MORE;
	114
fe869cdb HX	115	lock_sock(sk);
	116	sg_init_table(ctx->sgl.sg, 1);
	117	sg_set_page(ctx->sgl.sg, page, size, offset);
	118
	119	ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size);
	120
	121	if (!(flags & MSG_MORE)) {
	122	if (ctx->more)
	123	err = crypto_ahash_finup(&ctx->req);
	124	else
	125	err = crypto_ahash_digest(&ctx->req);
	126	} else {
	127	if (!ctx->more) {
	128	err = crypto_ahash_init(&ctx->req);
fe097861	129	err = af_alg_wait_for_completion(err, &ctx->completion);
fe869cdb HX	130	if (err)
	131	goto unlock;
	132	}
	133
	134	err = crypto_ahash_update(&ctx->req);
	135	}
	136
	137	err = af_alg_wait_for_completion(err, &ctx->completion);
	138	if (err)
	139	goto unlock;
	140
	141	ctx->more = flags & MSG_MORE;
	142
	143	unlock:
	144	release_sock(sk);
	145
	146	return err ?: size;
	147	}
	148
1b784140 YX	149	static int hash_recvmsg(struct socket sock, struct msghdr msg, size_t len,
1b784140 YX	150	int flags)
fe869cdb HX	151	{
	152	struct sock *sk = sock->sk;
	153	struct alg_sock *ask = alg_sk(sk);
	154	struct hash_ctx *ctx = ask->private;
	155	unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
	156	int err;
	157
	158	if (len > ds)
	159	len = ds;
	160	else if (len < ds)
	161	msg->msg_flags \|= MSG_TRUNC;
	162
	163	lock_sock(sk);
	164	if (ctx->more) {
	165	ctx->more = 0;
	166	ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
	167	err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
	168	&ctx->completion);
	169	if (err)
	170	goto unlock;
	171	}
	172
7eab8d9e	173	err = memcpy_to_msg(msg, ctx->result, len);
fe869cdb HX	174
	175	unlock:
	176	release_sock(sk);
	177
	178	return err ?: len;
	179	}
	180
	181	static int hash_accept(struct socket sock, struct socket newsock, int flags)
	182	{
	183	struct sock *sk = sock->sk;
	184	struct alg_sock *ask = alg_sk(sk);
	185	struct hash_ctx *ctx = ask->private;
	186	struct ahash_request *req = &ctx->req;
	187	char state[crypto_ahash_statesize(crypto_ahash_reqtfm(req))];
	188	struct sock *sk2;
	189	struct alg_sock *ask2;
	190	struct hash_ctx *ctx2;
4afa5f96	191	bool more;
fe869cdb HX	192	int err;
fe869cdb HX	193
4afa5f96 HX	194	lock_sock(sk);
	195	more = ctx->more;
	196	err = more ? crypto_ahash_export(req, state) : 0;
	197	release_sock(sk);
	198
fe869cdb HX	199	if (err)
	200	return err;
	201
	202	err = af_alg_accept(ask->parent, newsock);
	203	if (err)
	204	return err;
	205
	206	sk2 = newsock->sk;
	207	ask2 = alg_sk(sk2);
	208	ctx2 = ask2->private;
4afa5f96 HX	209	ctx2->more = more;
	210
	211	if (!more)
	212	return err;
fe869cdb HX	213
	214	err = crypto_ahash_import(&ctx2->req, state);
	215	if (err) {
	216	sock_orphan(sk2);
	217	sock_put(sk2);
	218	}
	219
	220	return err;
	221	}
	222
	223	static struct proto_ops algif_hash_ops = {
	224	.family = PF_ALG,
	225
	226	.connect = sock_no_connect,
	227	.socketpair = sock_no_socketpair,
	228	.getname = sock_no_getname,
	229	.ioctl = sock_no_ioctl,
	230	.listen = sock_no_listen,
	231	.shutdown = sock_no_shutdown,
	232	.getsockopt = sock_no_getsockopt,
	233	.mmap = sock_no_mmap,
	234	.bind = sock_no_bind,
	235	.setsockopt = sock_no_setsockopt,
	236	.poll = sock_no_poll,
	237
	238	.release = af_alg_release,
	239	.sendmsg = hash_sendmsg,
	240	.sendpage = hash_sendpage,
	241	.recvmsg = hash_recvmsg,
	242	.accept = hash_accept,
	243	};
	244
6de62f15 HX	245	static int hash_check_key(struct socket *sock)
6de62f15 HX	246	{
ad46d7e3	247	int err = 0;
6de62f15 HX	248	struct sock *psk;
	249	struct alg_sock *pask;
	250	struct algif_hash_tfm *tfm;
	251	struct sock *sk = sock->sk;
	252	struct alg_sock *ask = alg_sk(sk);
	253
ad46d7e3	254	lock_sock(sk);
6de62f15	255	if (ask->refcnt)
ad46d7e3	256	goto unlock_child;
6de62f15 HX	257
	258	psk = ask->parent;
	259	pask = alg_sk(ask->parent);
	260	tfm = pask->private;
	261
	262	err = -ENOKEY;
ad46d7e3	263	lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
6de62f15 HX	264	if (!tfm->has_key)
	265	goto unlock;
	266
	267	if (!pask->refcnt++)
	268	sock_hold(psk);
	269
	270	ask->refcnt = 1;
	271	sock_put(psk);
	272
	273	err = 0;
	274
	275	unlock:
	276	release_sock(psk);
ad46d7e3 HX	277	unlock_child:
ad46d7e3 HX	278	release_sock(sk);
6de62f15 HX	279
	280	return err;
	281	}
	282
	283	static int hash_sendmsg_nokey(struct socket sock, struct msghdr msg,
	284	size_t size)
	285	{
	286	int err;
	287
	288	err = hash_check_key(sock);
	289	if (err)
	290	return err;
	291
	292	return hash_sendmsg(sock, msg, size);
	293	}
	294
	295	static ssize_t hash_sendpage_nokey(struct socket sock, struct page page,
	296	int offset, size_t size, int flags)
	297	{
	298	int err;
	299
	300	err = hash_check_key(sock);
	301	if (err)
	302	return err;
	303
	304	return hash_sendpage(sock, page, offset, size, flags);
	305	}
	306
	307	static int hash_recvmsg_nokey(struct socket sock, struct msghdr msg,
	308	size_t ignored, int flags)
	309	{
	310	int err;
	311
	312	err = hash_check_key(sock);
	313	if (err)
	314	return err;
	315
	316	return hash_recvmsg(sock, msg, ignored, flags);
	317	}
	318
	319	static int hash_accept_nokey(struct socket sock, struct socket newsock,
	320	int flags)
	321	{
	322	int err;
	323
	324	err = hash_check_key(sock);
	325	if (err)
	326	return err;
	327
	328	return hash_accept(sock, newsock, flags);
	329	}
	330
	331	static struct proto_ops algif_hash_ops_nokey = {
	332	.family = PF_ALG,
	333
	334	.connect = sock_no_connect,
	335	.socketpair = sock_no_socketpair,
	336	.getname = sock_no_getname,
	337	.ioctl = sock_no_ioctl,
	338	.listen = sock_no_listen,
	339	.shutdown = sock_no_shutdown,
	340	.getsockopt = sock_no_getsockopt,
	341	.mmap = sock_no_mmap,
	342	.bind = sock_no_bind,
343	.setsockopt = sock_no_setsockopt,
344	.poll = sock_no_poll,
345
346	.release = af_alg_release,
347	.sendmsg = hash_sendmsg_nokey,
348	.sendpage = hash_sendpage_nokey,
349	.recvmsg = hash_recvmsg_nokey,
350	.accept = hash_accept_nokey,
351	};
352
fe869cdb HX	353	static void hash_bind(const char name, u32 type, u32 mask)
fe869cdb HX	354	{
6de62f15 HX	355	struct algif_hash_tfm *tfm;
	356	struct crypto_ahash *hash;
	357
	358	tfm = kzalloc(sizeof(*tfm), GFP_KERNEL);
	359	if (!tfm)
	360	return ERR_PTR(-ENOMEM);
	361
	362	hash = crypto_alloc_ahash(name, type, mask);
	363	if (IS_ERR(hash)) {
	364	kfree(tfm);
	365	return ERR_CAST(hash);
	366	}
	367
	368	tfm->hash = hash;
	369
	370	return tfm;
fe869cdb HX	371	}
	372
	373	static void hash_release(void *private)
	374	{
6de62f15 HX	375	struct algif_hash_tfm *tfm = private;
	376
	377	crypto_free_ahash(tfm->hash);
	378	kfree(tfm);
fe869cdb HX	379	}
	380
	381	static int hash_setkey(void private, const u8 key, unsigned int keylen)
	382	{
6de62f15 HX	383	struct algif_hash_tfm *tfm = private;
	384	int err;
	385
	386	err = crypto_ahash_setkey(tfm->hash, key, keylen);
	387	tfm->has_key = !err;
	388
	389	return err;
fe869cdb HX	390	}
fe869cdb HX	391
f1d84af1	392	static void hash_sock_destruct(struct sock *sk)
fe869cdb HX	393	{
	394	struct alg_sock *ask = alg_sk(sk);
	395	struct hash_ctx *ctx = ask->private;
	396
79e88659 DB	397	sock_kzfree_s(sk, ctx->result,
79e88659 DB	398	crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req)));
fe869cdb	399	sock_kfree_s(sk, ctx, ctx->len);
6de62f15 HX	400	af_alg_release_parent(sk);
	401	}
	402
f1d84af1	403	static int hash_accept_parent_nokey(void private, struct sock sk)
fe869cdb HX	404	{
	405	struct hash_ctx *ctx;
	406	struct alg_sock *ask = alg_sk(sk);
6de62f15 HX	407	struct algif_hash_tfm *tfm = private;
	408	struct crypto_ahash *hash = tfm->hash;
	409	unsigned len = sizeof(*ctx) + crypto_ahash_reqsize(hash);
	410	unsigned ds = crypto_ahash_digestsize(hash);
fe869cdb HX	411
	412	ctx = sock_kmalloc(sk, len, GFP_KERNEL);
	413	if (!ctx)
	414	return -ENOMEM;
	415
	416	ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
	417	if (!ctx->result) {
	418	sock_kfree_s(sk, ctx, len);
	419	return -ENOMEM;
	420	}
	421
	422	memset(ctx->result, 0, ds);
	423
	424	ctx->len = len;
	425	ctx->more = 0;
	426	af_alg_init_completion(&ctx->completion);
	427
	428	ask->private = ctx;
	429
6de62f15	430	ahash_request_set_tfm(&ctx->req, hash);
fe869cdb HX	431	ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
	432	af_alg_complete, &ctx->completion);
	433
	434	sk->sk_destruct = hash_sock_destruct;
	435
	436	return 0;
	437	}
	438
6de62f15 HX	439	static int hash_accept_parent(void private, struct sock sk)
	440	{
	441	struct algif_hash_tfm *tfm = private;
	442
	443	if (!tfm->has_key && crypto_ahash_has_setkey(tfm->hash))
	444	return -ENOKEY;
	445
f1d84af1	446	return hash_accept_parent_nokey(private, sk);
6de62f15 HX	447	}
6de62f15 HX	448
fe869cdb HX	449	static const struct af_alg_type algif_type_hash = {
	450	.bind = hash_bind,
	451	.release = hash_release,
	452	.setkey = hash_setkey,
	453	.accept = hash_accept_parent,
6de62f15	454	.accept_nokey = hash_accept_parent_nokey,
fe869cdb	455	.ops = &algif_hash_ops,
6de62f15	456	.ops_nokey = &algif_hash_ops_nokey,
fe869cdb HX	457	.name = "hash",
	458	.owner = THIS_MODULE
	459	};
	460
	461	static int __init algif_hash_init(void)
	462	{
	463	return af_alg_register_type(&algif_type_hash);
	464	}
	465
	466	static void __exit algif_hash_exit(void)
	467	{
	468	int err = af_alg_unregister_type(&algif_type_hash);
	469	BUG_ON(err);
	470	}
	471
	472	module_init(algif_hash_init);
	473	module_exit(algif_hash_exit);
	474	MODULE_LICENSE("GPL");