[linux-block.git] / crypto / authenc.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Authenc: Simple AEAD wrapper for IPsec
 *
 * Copyright (c) 2007-2015 Herbert Xu <herbert@gondor.apana.org.au>
 */

#include <crypto/internal/aead.h>
#include <crypto/internal/hash.h>
#include <crypto/internal/skcipher.h>
#include <crypto/authenc.h>
#include <crypto/null.h>
#include <crypto/scatterwalk.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include <linux/spinlock.h>

struct authenc_instance_ctx {
	struct crypto_ahash_spawn auth;
	struct crypto_skcipher_spawn enc;
	unsigned int reqoff;
};

struct crypto_authenc_ctx {
	struct crypto_ahash *auth;
	struct crypto_skcipher *enc;
	struct crypto_sync_skcipher *null;
};

struct authenc_request_ctx {
	struct scatterlist src[2];
	struct scatterlist dst[2];
	char tail[];
};

static void authenc_request_complete(struct aead_request *req, int err)
{
	if (err != -EINPROGRESS)
		aead_request_complete(req, err);
}

int crypto_authenc_extractkeys(struct crypto_authenc_keys *keys, const u8 *key,
			       unsigned int keylen)
{
	struct rtattr *rta = (struct rtattr *)key;
	struct crypto_authenc_key_param *param;

	if (!RTA_OK(rta, keylen))
		return -EINVAL;
	if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM)
		return -EINVAL;

	/*
	 * RTA_OK() didn't align the rtattr's payload when validating that it
	 * fits in the buffer.  Yet, the keys should start on the next 4-byte
	 * aligned boundary.  To avoid confusion, require that the rtattr
	 * payload be exactly the param struct, which has a 4-byte aligned size.
	 */
	if (RTA_PAYLOAD(rta) != sizeof(*param))
		return -EINVAL;
	BUILD_BUG_ON(sizeof(*param) % RTA_ALIGNTO);

	param = RTA_DATA(rta);
	keys->enckeylen = be32_to_cpu(param->enckeylen);

	key += rta->rta_len;
	keylen -= rta->rta_len;

	if (keylen < keys->enckeylen)
		return -EINVAL;

	keys->authkeylen = keylen - keys->enckeylen;
	keys->authkey = key;
	keys->enckey = key + keys->authkeylen;

	return 0;
}
EXPORT_SYMBOL_GPL(crypto_authenc_extractkeys);

static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key,
				 unsigned int keylen)
{
	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	struct crypto_ahash *auth = ctx->auth;
	struct crypto_skcipher *enc = ctx->enc;
	struct crypto_authenc_keys keys;
	int err = -EINVAL;

	if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
		goto out;

	crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
	crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc) &
				    CRYPTO_TFM_REQ_MASK);
	err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen);
	if (err)
		goto out;

	crypto_skcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
	crypto_skcipher_set_flags(enc, crypto_aead_get_flags(authenc) &
				       CRYPTO_TFM_REQ_MASK);
	err = crypto_skcipher_setkey(enc, keys.enckey, keys.enckeylen);
out:
	memzero_explicit(&keys, sizeof(keys));
	return err;
}

static void authenc_geniv_ahash_done(void *data, int err)
{
	struct aead_request *req = data;
	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	struct aead_instance *inst = aead_alg_instance(authenc);
	struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
	struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
	struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff);

	if (err)
		goto out;

	scatterwalk_map_and_copy(ahreq->result, req->dst,
				 req->assoclen + req->cryptlen,
				 crypto_aead_authsize(authenc), 1);

out:
	aead_request_complete(req, err);
}

static int crypto_authenc_genicv(struct aead_request *req, unsigned int flags)
{
	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	struct aead_instance *inst = aead_alg_instance(authenc);
	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
	struct crypto_ahash *auth = ctx->auth;
	struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
	struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff);
	u8 *hash = areq_ctx->tail;
	int err;

	hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),
			   crypto_ahash_alignmask(auth) + 1);

	ahash_request_set_tfm(ahreq, auth);
	ahash_request_set_crypt(ahreq, req->dst, hash,
				req->assoclen + req->cryptlen);
	ahash_request_set_callback(ahreq, flags,
				   authenc_geniv_ahash_done, req);

	err = crypto_ahash_digest(ahreq);
	if (err)
		return err;

	scatterwalk_map_and_copy(hash, req->dst, req->assoclen + req->cryptlen,
				 crypto_aead_authsize(authenc), 1);

	return 0;
}

static void crypto_authenc_encrypt_done(void *data, int err)
{
	struct aead_request *areq = data;

	if (err)
		goto out;

	err = crypto_authenc_genicv(areq, 0);

out:
	authenc_request_complete(areq, err);
}

static int crypto_authenc_copy_assoc(struct aead_request *req)
{
	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	SYNC_SKCIPHER_REQUEST_ON_STACK(skreq, ctx->null);

	skcipher_request_set_sync_tfm(skreq, ctx->null);
	skcipher_request_set_callback(skreq, aead_request_flags(req),
				      NULL, NULL);
	skcipher_request_set_crypt(skreq, req->src, req->dst, req->assoclen,
				   NULL);

	return crypto_skcipher_encrypt(skreq);
}

static int crypto_authenc_encrypt(struct aead_request *req)
{
	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	struct aead_instance *inst = aead_alg_instance(authenc);
	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
	struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
	struct crypto_skcipher *enc = ctx->enc;
	unsigned int cryptlen = req->cryptlen;
	struct skcipher_request *skreq = (void *)(areq_ctx->tail +
						  ictx->reqoff);
	struct scatterlist *src, *dst;
	int err;

	src = scatterwalk_ffwd(areq_ctx->src, req->src, req->assoclen);
	dst = src;

	if (req->src != req->dst) {
		err = crypto_authenc_copy_assoc(req);
		if (err)
			return err;

		dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, req->assoclen);
	}

	skcipher_request_set_tfm(skreq, enc);
	skcipher_request_set_callback(skreq, aead_request_flags(req),
				      crypto_authenc_encrypt_done, req);
	skcipher_request_set_crypt(skreq, src, dst, cryptlen, req->iv);

	err = crypto_skcipher_encrypt(skreq);
	if (err)
		return err;

	return crypto_authenc_genicv(req, aead_request_flags(req));
}

static int crypto_authenc_decrypt_tail(struct aead_request *req,
				       unsigned int flags)
{
	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	struct aead_instance *inst = aead_alg_instance(authenc);
	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
	struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
	struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff);
	struct skcipher_request *skreq = (void *)(areq_ctx->tail +
						  ictx->reqoff);
	unsigned int authsize = crypto_aead_authsize(authenc);
	u8 *ihash = ahreq->result + authsize;
	struct scatterlist *src, *dst;

	scatterwalk_map_and_copy(ihash, req->src, ahreq->nbytes, authsize, 0);

	if (crypto_memneq(ihash, ahreq->result, authsize))
		return -EBADMSG;

	src = scatterwalk_ffwd(areq_ctx->src, req->src, req->assoclen);
	dst = src;

	if (req->src != req->dst)
		dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, req->assoclen);

	skcipher_request_set_tfm(skreq, ctx->enc);
	skcipher_request_set_callback(skreq, flags,
				      req->base.complete, req->base.data);
	skcipher_request_set_crypt(skreq, src, dst,
				   req->cryptlen - authsize, req->iv);

	return crypto_skcipher_decrypt(skreq);
}

static void authenc_verify_ahash_done(void *data, int err)
{
	struct aead_request *req = data;

	if (err)
		goto out;

	err = crypto_authenc_decrypt_tail(req, 0);

out:
	authenc_request_complete(req, err);
}

static int crypto_authenc_decrypt(struct aead_request *req)
{
	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	unsigned int authsize = crypto_aead_authsize(authenc);
	struct aead_instance *inst = aead_alg_instance(authenc);
	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
	struct crypto_ahash *auth = ctx->auth;
	struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
	struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff);
	u8 *hash = areq_ctx->tail;
	int err;

	hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),
			   crypto_ahash_alignmask(auth) + 1);

	ahash_request_set_tfm(ahreq, auth);
	ahash_request_set_crypt(ahreq, req->src, hash,
				req->assoclen + req->cryptlen - authsize);
	ahash_request_set_callback(ahreq, aead_request_flags(req),
				   authenc_verify_ahash_done, req);

	err = crypto_ahash_digest(ahreq);
	if (err)
		return err;

	return crypto_authenc_decrypt_tail(req, aead_request_flags(req));
}

static int crypto_authenc_init_tfm(struct crypto_aead *tfm)
{
	struct aead_instance *inst = aead_alg_instance(tfm);
	struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(tfm);
	struct crypto_ahash *auth;
	struct crypto_skcipher *enc;
	struct crypto_sync_skcipher *null;
	int err;

	auth = crypto_spawn_ahash(&ictx->auth);
	if (IS_ERR(auth))
		return PTR_ERR(auth);

	enc = crypto_spawn_skcipher(&ictx->enc);
	err = PTR_ERR(enc);
	if (IS_ERR(enc))
		goto err_free_ahash;

	null = crypto_get_default_null_skcipher();
	err = PTR_ERR(null);
	if (IS_ERR(null))
		goto err_free_skcipher;

	ctx->auth = auth;
	ctx->enc = enc;
	ctx->null = null;

	crypto_aead_set_reqsize(
		tfm,
		sizeof(struct authenc_request_ctx) +
		ictx->reqoff +
		max_t(unsigned int,
		      crypto_ahash_reqsize(auth) +
		      sizeof(struct ahash_request),
		      sizeof(struct skcipher_request) +
		      crypto_skcipher_reqsize(enc)));

	return 0;

err_free_skcipher:
	crypto_free_skcipher(enc);
err_free_ahash:
	crypto_free_ahash(auth);
	return err;
}

static void crypto_authenc_exit_tfm(struct crypto_aead *tfm)
{
	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(tfm);

	crypto_free_ahash(ctx->auth);
	crypto_free_skcipher(ctx->enc);
	crypto_put_default_null_skcipher();
}

static void crypto_authenc_free(struct aead_instance *inst)
{
	struct authenc_instance_ctx *ctx = aead_instance_ctx(inst);

	crypto_drop_skcipher(&ctx->enc);
	crypto_drop_ahash(&ctx->auth);
	kfree(inst);
}

static int crypto_authenc_create(struct crypto_template *tmpl,
				 struct rtattr **tb)
{
	u32 mask;
	struct aead_instance *inst;
	struct authenc_instance_ctx *ctx;
	struct hash_alg_common *auth;
	struct crypto_alg *auth_base;
	struct skcipher_alg *enc;
	int err;

	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
	if (err)
		return err;

	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
	if (!inst)
		return -ENOMEM;
	ctx = aead_instance_ctx(inst);

	err = crypto_grab_ahash(&ctx->auth, aead_crypto_instance(inst),
				crypto_attr_alg_name(tb[1]), 0, mask);
	if (err)
		goto err_free_inst;
	auth = crypto_spawn_ahash_alg(&ctx->auth);
	auth_base = &auth->base;

	err = crypto_grab_skcipher(&ctx->enc, aead_crypto_instance(inst),
				   crypto_attr_alg_name(tb[2]), 0, mask);
	if (err)
		goto err_free_inst;
	enc = crypto_spawn_skcipher_alg(&ctx->enc);

	ctx->reqoff = ALIGN(2 * auth->digestsize + auth_base->cra_alignmask,
			    auth_base->cra_alignmask + 1);

	err = -ENAMETOOLONG;
	if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
		     "authenc(%s,%s)", auth_base->cra_name,
		     enc->base.cra_name) >=
	    CRYPTO_MAX_ALG_NAME)
		goto err_free_inst;

	if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
		     "authenc(%s,%s)", auth_base->cra_driver_name,
		     enc->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
		goto err_free_inst;

	inst->alg.base.cra_priority = enc->base.cra_priority * 10 +
				      auth_base->cra_priority;
	inst->alg.base.cra_blocksize = enc->base.cra_blocksize;
	inst->alg.base.cra_alignmask = auth_base->cra_alignmask |
				       enc->base.cra_alignmask;
	inst->alg.base.cra_ctxsize = sizeof(struct crypto_authenc_ctx);

	inst->alg.ivsize = crypto_skcipher_alg_ivsize(enc);
	inst->alg.chunksize = crypto_skcipher_alg_chunksize(enc);
	inst->alg.maxauthsize = auth->digestsize;

	inst->alg.init = crypto_authenc_init_tfm;
	inst->alg.exit = crypto_authenc_exit_tfm;

	inst->alg.setkey = crypto_authenc_setkey;
	inst->alg.encrypt = crypto_authenc_encrypt;
	inst->alg.decrypt = crypto_authenc_decrypt;

	inst->free = crypto_authenc_free;

	err = aead_register_instance(tmpl, inst);
	if (err) {
err_free_inst:
		crypto_authenc_free(inst);
	}
	return err;
}

static struct crypto_template crypto_authenc_tmpl = {
	.name = "authenc",
	.create = crypto_authenc_create,
	.module = THIS_MODULE,
};

static int __init crypto_authenc_module_init(void)
{
	return crypto_register_template(&crypto_authenc_tmpl);
}

static void __exit crypto_authenc_module_exit(void)
{
	crypto_unregister_template(&crypto_authenc_tmpl);
}

subsys_initcall(crypto_authenc_module_init);
module_exit(crypto_authenc_module_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec");
MODULE_ALIAS_CRYPTO("authenc");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
3c09f17c HX	2	/*
	3	* Authenc: Simple AEAD wrapper for IPsec
	4	*
92d95ba9	5	* Copyright (c) 2007-2015 Herbert Xu <herbert@gondor.apana.org.au>
3c09f17c HX	6	*/
3c09f17c HX	7
68acbf84	8	#include <crypto/internal/aead.h>
5f7082ed	9	#include <crypto/internal/hash.h>
9ffde35a	10	#include <crypto/internal/skcipher.h>
e236d4a8	11	#include <crypto/authenc.h>
92d95ba9	12	#include <crypto/null.h>
42c271c6	13	#include <crypto/scatterwalk.h>
3c09f17c HX	14	#include <linux/err.h>
	15	#include <linux/init.h>
	16	#include <linux/kernel.h>
	17	#include <linux/module.h>
e236d4a8	18	#include <linux/rtnetlink.h>
3c09f17c HX	19	#include <linux/slab.h>
	20	#include <linux/spinlock.h>
	21
3c09f17c	22	struct authenc_instance_ctx {
cbdcf80d	23	struct crypto_ahash_spawn auth;
9ffde35a	24	struct crypto_skcipher_spawn enc;
92d95ba9	25	unsigned int reqoff;
3c09f17c HX	26	};
	27
	28	struct crypto_authenc_ctx {
cbdcf80d	29	struct crypto_ahash *auth;
7217d49f	30	struct crypto_skcipher *enc;
8d605398	31	struct crypto_sync_skcipher *null;
3c09f17c HX	32	};
3c09f17c HX	33
cbdcf80d	34	struct authenc_request_ctx {
92d95ba9 HX	35	struct scatterlist src[2];
92d95ba9 HX	36	struct scatterlist dst[2];
cbdcf80d SK	37	char tail[];
	38	};
	39
180ce7e8 HX	40	static void authenc_request_complete(struct aead_request *req, int err)
	41	{
	42	if (err != -EINPROGRESS)
	43	aead_request_complete(req, err);
	44	}
	45
bc6e2bdb MK	46	int crypto_authenc_extractkeys(struct crypto_authenc_keys keys, const u8 key,
bc6e2bdb MK	47	unsigned int keylen)
3c09f17c	48	{
bc6e2bdb	49	struct rtattr rta = (struct rtattr )key;
e236d4a8	50	struct crypto_authenc_key_param *param;
3c09f17c	51
12dc5e62	52	if (!RTA_OK(rta, keylen))
bc6e2bdb	53	return -EINVAL;
e236d4a8	54	if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM)
bc6e2bdb	55	return -EINVAL;
8f9c4693 EB	56
	57	/*
	58	* RTA_OK() didn't align the rtattr's payload when validating that it
	59	* fits in the buffer. Yet, the keys should start on the next 4-byte
	60	* aligned boundary. To avoid confusion, require that the rtattr
	61	* payload be exactly the param struct, which has a 4-byte aligned size.
	62	*/
	63	if (RTA_PAYLOAD(rta) != sizeof(*param))
bc6e2bdb	64	return -EINVAL;
8f9c4693	65	BUILD_BUG_ON(sizeof(*param) % RTA_ALIGNTO);
e236d4a8 HX	66
e236d4a8 HX	67	param = RTA_DATA(rta);
bc6e2bdb	68	keys->enckeylen = be32_to_cpu(param->enckeylen);
e236d4a8	69
8f9c4693 EB	70	key += rta->rta_len;
8f9c4693 EB	71	keylen -= rta->rta_len;
e236d4a8	72
bc6e2bdb MK	73	if (keylen < keys->enckeylen)
	74	return -EINVAL;
	75
	76	keys->authkeylen = keylen - keys->enckeylen;
	77	keys->authkey = key;
	78	keys->enckey = key + keys->authkeylen;
e236d4a8	79
bc6e2bdb MK	80	return 0;
	81	}
	82	EXPORT_SYMBOL_GPL(crypto_authenc_extractkeys);
	83
	84	static int crypto_authenc_setkey(struct crypto_aead authenc, const u8 key,
	85	unsigned int keylen)
	86	{
	87	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	88	struct crypto_ahash *auth = ctx->auth;
7217d49f	89	struct crypto_skcipher *enc = ctx->enc;
bc6e2bdb MK	90	struct crypto_authenc_keys keys;
	91	int err = -EINVAL;
	92
	93	if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
674f368a	94	goto out;
3c09f17c	95
cbdcf80d SK	96	crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
cbdcf80d SK	97	crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc) &
3c09f17c	98	CRYPTO_TFM_REQ_MASK);
bc6e2bdb	99	err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen);
3c09f17c HX	100	if (err)
	101	goto out;
	102
7217d49f HX	103	crypto_skcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
	104	crypto_skcipher_set_flags(enc, crypto_aead_get_flags(authenc) &
	105	CRYPTO_TFM_REQ_MASK);
	106	err = crypto_skcipher_setkey(enc, keys.enckey, keys.enckeylen);
3c09f17c	107	out:
ad2fdcdf	108	memzero_explicit(&keys, sizeof(keys));
3c09f17c HX	109	return err;
	110	}
	111
255e48eb	112	static void authenc_geniv_ahash_done(void *data, int err)
cbdcf80d	113	{
255e48eb	114	struct aead_request *req = data;
cbdcf80d	115	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
92d95ba9 HX	116	struct aead_instance *inst = aead_alg_instance(authenc);
92d95ba9 HX	117	struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
cbdcf80d	118	struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
92d95ba9	119	struct ahash_request ahreq = (void )(areq_ctx->tail + ictx->reqoff);
cbdcf80d SK	120
	121	if (err)
	122	goto out;
	123
92d95ba9 HX	124	scatterwalk_map_and_copy(ahreq->result, req->dst,
92d95ba9 HX	125	req->assoclen + req->cryptlen,
cbdcf80d SK	126	crypto_aead_authsize(authenc), 1);
	127
	128	out:
	129	aead_request_complete(req, err);
	130	}
	131
92d95ba9	132	static int crypto_authenc_genicv(struct aead_request *req, unsigned int flags)
cbdcf80d SK	133	{
cbdcf80d SK	134	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
92d95ba9	135	struct aead_instance *inst = aead_alg_instance(authenc);
cbdcf80d	136	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
92d95ba9	137	struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
cbdcf80d SK	138	struct crypto_ahash *auth = ctx->auth;
cbdcf80d SK	139	struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
92d95ba9	140	struct ahash_request ahreq = (void )(areq_ctx->tail + ictx->reqoff);
cbdcf80d SK	141	u8 *hash = areq_ctx->tail;
cbdcf80d SK	142	int err;
3c09f17c	143
cbdcf80d SK	144	hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),
	145	crypto_ahash_alignmask(auth) + 1);
	146
	147	ahash_request_set_tfm(ahreq, auth);
92d95ba9 HX	148	ahash_request_set_crypt(ahreq, req->dst, hash,
	149	req->assoclen + req->cryptlen);
	150	ahash_request_set_callback(ahreq, flags,
	151	authenc_geniv_ahash_done, req);
cbdcf80d SK	152
cbdcf80d SK	153	err = crypto_ahash_digest(ahreq);
3c09f17c	154	if (err)
92d95ba9	155	return err;
3c09f17c	156
92d95ba9	157	scatterwalk_map_and_copy(hash, req->dst, req->assoclen + req->cryptlen,
7ba683a6	158	crypto_aead_authsize(authenc), 1);
92d95ba9	159
3c09f17c HX	160	return 0;
	161	}
	162
255e48eb	163	static void crypto_authenc_encrypt_done(void *data, int err)
3c09f17c	164	{
255e48eb	165	struct aead_request *areq = data;
a697690b	166
92d95ba9 HX	167	if (err)
92d95ba9 HX	168	goto out;
e56dd564	169
92d95ba9	170	err = crypto_authenc_genicv(areq, 0);
3c09f17c	171
92d95ba9	172	out:
180ce7e8	173	authenc_request_complete(areq, err);
3c09f17c HX	174	}
3c09f17c HX	175
92d95ba9 HX	176	static int crypto_authenc_copy_assoc(struct aead_request *req)
	177	{
	178	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	179	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
8d605398	180	SYNC_SKCIPHER_REQUEST_ON_STACK(skreq, ctx->null);
92d95ba9	181
8d605398	182	skcipher_request_set_sync_tfm(skreq, ctx->null);
7217d49f HX	183	skcipher_request_set_callback(skreq, aead_request_flags(req),
	184	NULL, NULL);
	185	skcipher_request_set_crypt(skreq, req->src, req->dst, req->assoclen,
	186	NULL);
	187
	188	return crypto_skcipher_encrypt(skreq);
92d95ba9 HX	189	}
92d95ba9 HX	190
3c09f17c HX	191	static int crypto_authenc_encrypt(struct aead_request *req)
	192	{
	193	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
92d95ba9	194	struct aead_instance *inst = aead_alg_instance(authenc);
3c09f17c	195	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
92d95ba9	196	struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
50beceba	197	struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
7217d49f	198	struct crypto_skcipher *enc = ctx->enc;
e56dd564	199	unsigned int cryptlen = req->cryptlen;
7217d49f HX	200	struct skcipher_request skreq = (void )(areq_ctx->tail +
7217d49f HX	201	ictx->reqoff);
92d95ba9	202	struct scatterlist src, dst;
3c09f17c HX	203	int err;
3c09f17c HX	204
92d95ba9 HX	205	src = scatterwalk_ffwd(areq_ctx->src, req->src, req->assoclen);
	206	dst = src;
	207
	208	if (req->src != req->dst) {
	209	err = crypto_authenc_copy_assoc(req);
	210	if (err)
	211	return err;
	212
92d95ba9 HX	213	dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, req->assoclen);
	214	}
	215
7217d49f HX	216	skcipher_request_set_tfm(skreq, enc);
	217	skcipher_request_set_callback(skreq, aead_request_flags(req),
	218	crypto_authenc_encrypt_done, req);
	219	skcipher_request_set_crypt(skreq, src, dst, cryptlen, req->iv);
3c09f17c	220
7217d49f	221	err = crypto_skcipher_encrypt(skreq);
3c09f17c HX	222	if (err)
	223	return err;
	224
92d95ba9	225	return crypto_authenc_genicv(req, aead_request_flags(req));
e56dd564 HX	226	}
e56dd564 HX	227
92d95ba9 HX	228	static int crypto_authenc_decrypt_tail(struct aead_request *req,
92d95ba9 HX	229	unsigned int flags)
e56dd564	230	{
92d95ba9 HX	231	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	232	struct aead_instance *inst = aead_alg_instance(authenc);
	233	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	234	struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
	235	struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
	236	struct ahash_request ahreq = (void )(areq_ctx->tail + ictx->reqoff);
7217d49f HX	237	struct skcipher_request skreq = (void )(areq_ctx->tail +
7217d49f HX	238	ictx->reqoff);
92d95ba9 HX	239	unsigned int authsize = crypto_aead_authsize(authenc);
	240	u8 *ihash = ahreq->result + authsize;
	241	struct scatterlist src, dst;
e56dd564	242
92d95ba9	243	scatterwalk_map_and_copy(ihash, req->src, ahreq->nbytes, authsize, 0);
e56dd564	244
92d95ba9 HX	245	if (crypto_memneq(ihash, ahreq->result, authsize))
92d95ba9 HX	246	return -EBADMSG;
e56dd564	247
92d95ba9 HX	248	src = scatterwalk_ffwd(areq_ctx->src, req->src, req->assoclen);
92d95ba9 HX	249	dst = src;
e56dd564	250
c34252fd	251	if (req->src != req->dst)
92d95ba9	252	dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, req->assoclen);
e56dd564	253
7217d49f	254	skcipher_request_set_tfm(skreq, ctx->enc);
66eae850	255	skcipher_request_set_callback(skreq, flags,
7217d49f HX	256	req->base.complete, req->base.data);
	257	skcipher_request_set_crypt(skreq, src, dst,
	258	req->cryptlen - authsize, req->iv);
3c09f17c	259
7217d49f	260	return crypto_skcipher_decrypt(skreq);
3c09f17c HX	261	}
3c09f17c HX	262
255e48eb	263	static void authenc_verify_ahash_done(void *data, int err)
3c09f17c	264	{
255e48eb	265	struct aead_request *req = data;
cbdcf80d	266
92d95ba9 HX	267	if (err)
92d95ba9 HX	268	goto out;
e56dd564	269
92d95ba9	270	err = crypto_authenc_decrypt_tail(req, 0);
cbdcf80d	271
92d95ba9 HX	272	out:
92d95ba9 HX	273	authenc_request_complete(req, err);
3c09f17c HX	274	}
	275
	276	static int crypto_authenc_decrypt(struct aead_request *req)
	277	{
	278	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
481f34ae	279	unsigned int authsize = crypto_aead_authsize(authenc);
92d95ba9 HX	280	struct aead_instance *inst = aead_alg_instance(authenc);
	281	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	282	struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
	283	struct crypto_ahash *auth = ctx->auth;
	284	struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
	285	struct ahash_request ahreq = (void )(areq_ctx->tail + ictx->reqoff);
	286	u8 *hash = areq_ctx->tail;
3c09f17c HX	287	int err;
3c09f17c HX	288
92d95ba9 HX	289	hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),
92d95ba9 HX	290	crypto_ahash_alignmask(auth) + 1);
481f34ae	291
92d95ba9 HX	292	ahash_request_set_tfm(ahreq, auth);
	293	ahash_request_set_crypt(ahreq, req->src, hash,
	294	req->assoclen + req->cryptlen - authsize);
	295	ahash_request_set_callback(ahreq, aead_request_flags(req),
	296	authenc_verify_ahash_done, req);
	297
	298	err = crypto_ahash_digest(ahreq);
3c09f17c HX	299	if (err)
	300	return err;
	301
92d95ba9	302	return crypto_authenc_decrypt_tail(req, aead_request_flags(req));
3c09f17c HX	303	}
3c09f17c HX	304
92d95ba9	305	static int crypto_authenc_init_tfm(struct crypto_aead *tfm)
3c09f17c	306	{
92d95ba9 HX	307	struct aead_instance *inst = aead_alg_instance(tfm);
	308	struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
	309	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(tfm);
cbdcf80d	310	struct crypto_ahash *auth;
7217d49f	311	struct crypto_skcipher *enc;
8d605398	312	struct crypto_sync_skcipher *null;
3c09f17c HX	313	int err;
3c09f17c HX	314
cbdcf80d	315	auth = crypto_spawn_ahash(&ictx->auth);
3c09f17c HX	316	if (IS_ERR(auth))
	317	return PTR_ERR(auth);
	318
60425a8b	319	enc = crypto_spawn_skcipher(&ictx->enc);
3c09f17c HX	320	err = PTR_ERR(enc);
3c09f17c HX	321	if (IS_ERR(enc))
cbdcf80d	322	goto err_free_ahash;
3c09f17c	323
3a2d4fb5	324	null = crypto_get_default_null_skcipher();
92d95ba9 HX	325	err = PTR_ERR(null);
	326	if (IS_ERR(null))
	327	goto err_free_skcipher;
	328
3c09f17c HX	329	ctx->auth = auth;
3c09f17c HX	330	ctx->enc = enc;
92d95ba9	331	ctx->null = null;
f3542e6d	332
92d95ba9 HX	333	crypto_aead_set_reqsize(
92d95ba9 HX	334	tfm,
25df9194	335	sizeof(struct authenc_request_ctx) +
92d95ba9	336	ictx->reqoff +
25df9194	337	max_t(unsigned int,
92d95ba9 HX	338	crypto_ahash_reqsize(auth) +
92d95ba9 HX	339	sizeof(struct ahash_request),
7217d49f HX	340	sizeof(struct skcipher_request) +
7217d49f HX	341	crypto_skcipher_reqsize(enc)));
3c09f17c HX	342
	343	return 0;
	344
92d95ba9	345	err_free_skcipher:
7217d49f	346	crypto_free_skcipher(enc);
cbdcf80d SK	347	err_free_ahash:
cbdcf80d SK	348	crypto_free_ahash(auth);
3c09f17c HX	349	return err;
	350	}
	351
92d95ba9	352	static void crypto_authenc_exit_tfm(struct crypto_aead *tfm)
3c09f17c	353	{
92d95ba9	354	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(tfm);
3c09f17c	355
cbdcf80d	356	crypto_free_ahash(ctx->auth);
7217d49f	357	crypto_free_skcipher(ctx->enc);
3a2d4fb5	358	crypto_put_default_null_skcipher();
3c09f17c HX	359	}
3c09f17c HX	360
92d95ba9 HX	361	static void crypto_authenc_free(struct aead_instance *inst)
	362	{
	363	struct authenc_instance_ctx *ctx = aead_instance_ctx(inst);
	364
	365	crypto_drop_skcipher(&ctx->enc);
	366	crypto_drop_ahash(&ctx->auth);
	367	kfree(inst);
	368	}
	369
	370	static int crypto_authenc_create(struct crypto_template *tmpl,
	371	struct rtattr **tb)
3c09f17c	372	{
b9f76ddd	373	u32 mask;
92d95ba9	374	struct aead_instance *inst;
37a861ad	375	struct authenc_instance_ctx *ctx;
cbdcf80d SK	376	struct hash_alg_common *auth;
cbdcf80d SK	377	struct crypto_alg *auth_base;
7217d49f	378	struct skcipher_alg *enc;
3c09f17c HX	379	int err;
3c09f17c HX	380
7bcb2c99 EB	381	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
	382	if (err)
	383	return err;
b9f76ddd	384
3c09f17c	385	inst = kzalloc(sizeof(inst) + sizeof(ctx), GFP_KERNEL);
3c09f17c	386	if (!inst)
37a861ad	387	return -ENOMEM;
92d95ba9	388	ctx = aead_instance_ctx(inst);
3c09f17c	389
37a861ad EB	390	err = crypto_grab_ahash(&ctx->auth, aead_crypto_instance(inst),
37a861ad EB	391	crypto_attr_alg_name(tb[1]), 0, mask);
3c09f17c HX	392	if (err)
3c09f17c HX	393	goto err_free_inst;
37a861ad EB	394	auth = crypto_spawn_ahash_alg(&ctx->auth);
37a861ad EB	395	auth_base = &auth->base;
3c09f17c	396
b9f76ddd	397	err = crypto_grab_skcipher(&ctx->enc, aead_crypto_instance(inst),
37a861ad	398	crypto_attr_alg_name(tb[2]), 0, mask);
3c09f17c	399	if (err)
37a861ad	400	goto err_free_inst;
7217d49f	401	enc = crypto_spawn_skcipher_alg(&ctx->enc);
9ffde35a	402
92d95ba9 HX	403	ctx->reqoff = ALIGN(2 * auth->digestsize + auth_base->cra_alignmask,
	404	auth_base->cra_alignmask + 1);
	405
9ffde35a	406	err = -ENAMETOOLONG;
92d95ba9	407	if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
7217d49f HX	408	"authenc(%s,%s)", auth_base->cra_name,
7217d49f HX	409	enc->base.cra_name) >=
9ffde35a	410	CRYPTO_MAX_ALG_NAME)
37a861ad	411	goto err_free_inst;
9ffde35a	412
92d95ba9	413	if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
cbdcf80d	414	"authenc(%s,%s)", auth_base->cra_driver_name,
7217d49f	415	enc->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
37a861ad	416	goto err_free_inst;
9ffde35a	417
7217d49f	418	inst->alg.base.cra_priority = enc->base.cra_priority * 10 +
92d95ba9	419	auth_base->cra_priority;
7217d49f	420	inst->alg.base.cra_blocksize = enc->base.cra_blocksize;
92d95ba9	421	inst->alg.base.cra_alignmask = auth_base->cra_alignmask \|
7217d49f	422	enc->base.cra_alignmask;
92d95ba9 HX	423	inst->alg.base.cra_ctxsize = sizeof(struct crypto_authenc_ctx);
92d95ba9 HX	424
7217d49f HX	425	inst->alg.ivsize = crypto_skcipher_alg_ivsize(enc);
7217d49f HX	426	inst->alg.chunksize = crypto_skcipher_alg_chunksize(enc);
92d95ba9	427	inst->alg.maxauthsize = auth->digestsize;
3c09f17c	428
92d95ba9 HX	429	inst->alg.init = crypto_authenc_init_tfm;
92d95ba9 HX	430	inst->alg.exit = crypto_authenc_exit_tfm;
3c09f17c	431
92d95ba9 HX	432	inst->alg.setkey = crypto_authenc_setkey;
	433	inst->alg.encrypt = crypto_authenc_encrypt;
	434	inst->alg.decrypt = crypto_authenc_decrypt;
3c09f17c	435
92d95ba9	436	inst->free = crypto_authenc_free;
3c09f17c	437
92d95ba9	438	err = aead_register_instance(tmpl, inst);
37a861ad	439	if (err) {
3c09f17c	440	err_free_inst:
37a861ad EB	441	crypto_authenc_free(inst);
	442	}
	443	return err;
3c09f17c HX	444	}
3c09f17c HX	445
3c09f17c HX	446	static struct crypto_template crypto_authenc_tmpl = {
3c09f17c HX	447	.name = "authenc",
92d95ba9	448	.create = crypto_authenc_create,
3c09f17c HX	449	.module = THIS_MODULE,
	450	};
	451
	452	static int __init crypto_authenc_module_init(void)
	453	{
	454	return crypto_register_template(&crypto_authenc_tmpl);
	455	}
	456
	457	static void __exit crypto_authenc_module_exit(void)
	458	{
	459	crypto_unregister_template(&crypto_authenc_tmpl);
	460	}
	461
c4741b23	462	subsys_initcall(crypto_authenc_module_init);
3c09f17c HX	463	module_exit(crypto_authenc_module_exit);
	464
	465	MODULE_LICENSE("GPL");
	466	MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec");
4943ba16	467	MODULE_ALIAS_CRYPTO("authenc");