[mirror_ubuntu-bionic-kernel.git] / crypto / authenc.c

/*
 * Authenc: Simple AEAD wrapper for IPsec
 *
 * Copyright (c) 2007 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/internal/skcipher.h>
#include <crypto/authenc.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_spawn auth;
	struct crypto_skcipher_spawn enc;
};

struct crypto_authenc_ctx {
	spinlock_t auth_lock;
	struct crypto_hash *auth;
	struct crypto_ablkcipher *enc;
};

static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key,
				 unsigned int keylen)
{
	unsigned int authkeylen;
	unsigned int enckeylen;
	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	struct crypto_hash *auth = ctx->auth;
	struct crypto_ablkcipher *enc = ctx->enc;
	struct rtattr *rta = (void *)key;
	struct crypto_authenc_key_param *param;
	int err = -EINVAL;

	if (!RTA_OK(rta, keylen))
		goto badkey;
	if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM)
		goto badkey;
	if (RTA_PAYLOAD(rta) < sizeof(*param))
		goto badkey;

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

	key += RTA_ALIGN(rta->rta_len);
	keylen -= RTA_ALIGN(rta->rta_len);

	if (keylen < enckeylen)
		goto badkey;

	authkeylen = keylen - enckeylen;

	crypto_hash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
	crypto_hash_set_flags(auth, crypto_aead_get_flags(authenc) &
				    CRYPTO_TFM_REQ_MASK);
	err = crypto_hash_setkey(auth, key, authkeylen);
	crypto_aead_set_flags(authenc, crypto_hash_get_flags(auth) &
				       CRYPTO_TFM_RES_MASK);

	if (err)
		goto out;

	crypto_ablkcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
	crypto_ablkcipher_set_flags(enc, crypto_aead_get_flags(authenc) &
					 CRYPTO_TFM_REQ_MASK);
	err = crypto_ablkcipher_setkey(enc, key + authkeylen, enckeylen);
	crypto_aead_set_flags(authenc, crypto_ablkcipher_get_flags(enc) &
				       CRYPTO_TFM_RES_MASK);

out:
	return err;

badkey:
	crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN);
	goto out;
}

static u8 *crypto_authenc_hash(struct aead_request *req, unsigned int flags,
			       struct scatterlist *cipher,
			       unsigned int cryptlen)
{
	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	struct crypto_hash *auth = ctx->auth;
	struct hash_desc desc = {
		.tfm = auth,
		.flags = aead_request_flags(req) & flags,
	};
	u8 *hash = aead_request_ctx(req);
	int err;

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

	spin_lock_bh(&ctx->auth_lock);
	err = crypto_hash_init(&desc);
	if (err)
		goto auth_unlock;

	err = crypto_hash_update(&desc, req->assoc, req->assoclen);
	if (err)
		goto auth_unlock;

	err = crypto_hash_update(&desc, cipher, cryptlen);
	if (err)
		goto auth_unlock;

	err = crypto_hash_final(&desc, hash);
auth_unlock:
	spin_unlock_bh(&ctx->auth_lock);

	if (err)
		return ERR_PTR(err);

	return hash;
}

static int crypto_authenc_genicv(struct aead_request *req, unsigned int flags)
{
	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	struct scatterlist *dst = req->dst;
	unsigned int cryptlen = req->cryptlen;
	u8 *hash;

	hash = crypto_authenc_hash(req, flags, dst, cryptlen);
	if (IS_ERR(hash))
		return PTR_ERR(hash);

	scatterwalk_map_and_copy(hash, dst, cryptlen,
				 crypto_aead_authsize(authenc), 1);
	return 0;
}

static void crypto_authenc_encrypt_done(struct crypto_async_request *req,
					int err)
{
	if (!err)
		err = crypto_authenc_genicv(req->data, 0);

	aead_request_complete(req->data, err);
}

static int crypto_authenc_encrypt(struct aead_request *req)
{
	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	struct ablkcipher_request *abreq = aead_request_ctx(req);
	int err;

	ablkcipher_request_set_tfm(abreq, ctx->enc);
	ablkcipher_request_set_callback(abreq, aead_request_flags(req),
					crypto_authenc_encrypt_done, req);
	ablkcipher_request_set_crypt(abreq, req->src, req->dst, req->cryptlen,
				     req->iv);

	err = crypto_ablkcipher_encrypt(abreq);
	if (err)
		return err;

	return crypto_authenc_genicv(req, CRYPTO_TFM_REQ_MAY_SLEEP);
}

static int crypto_authenc_verify(struct aead_request *req,
				 unsigned int cryptlen)
{
	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	u8 *ohash;
	u8 *ihash;
	struct scatterlist *src = req->src;
	unsigned int authsize;

	ohash = crypto_authenc_hash(req, CRYPTO_TFM_REQ_MAY_SLEEP, src,
				    cryptlen);
	if (IS_ERR(ohash))
		return PTR_ERR(ohash);

	authsize = crypto_aead_authsize(authenc);
	ihash = ohash + authsize;
	scatterwalk_map_and_copy(ihash, src, cryptlen, authsize, 0);
	return memcmp(ihash, ohash, authsize) ? -EBADMSG: 0;
}

static void crypto_authenc_decrypt_done(struct crypto_async_request *req,
					int err)
{
	aead_request_complete(req->data, err);
}

static int crypto_authenc_decrypt(struct aead_request *req)
{
	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	struct ablkcipher_request *abreq = aead_request_ctx(req);
	unsigned int cryptlen = req->cryptlen;
	unsigned int authsize = crypto_aead_authsize(authenc);
	int err;

	if (cryptlen < authsize)
		return -EINVAL;
	cryptlen -= authsize;

	err = crypto_authenc_verify(req, cryptlen);
	if (err)
		return err;

	ablkcipher_request_set_tfm(abreq, ctx->enc);
	ablkcipher_request_set_callback(abreq, aead_request_flags(req),
					crypto_authenc_decrypt_done, req);
	ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen,
				     req->iv);

	return crypto_ablkcipher_decrypt(abreq);
}

static int crypto_authenc_init_tfm(struct crypto_tfm *tfm)
{
	struct crypto_instance *inst = (void *)tfm->__crt_alg;
	struct authenc_instance_ctx *ictx = crypto_instance_ctx(inst);
	struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
	struct crypto_hash *auth;
	struct crypto_ablkcipher *enc;
	int err;

	auth = crypto_spawn_hash(&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_hash;

	ctx->auth = auth;
	ctx->enc = enc;
	tfm->crt_aead.reqsize = max_t(unsigned int,
				      (crypto_hash_alignmask(auth) &
				       ~(crypto_tfm_ctx_alignment() - 1)) +
				      crypto_hash_digestsize(auth) * 2,
				      sizeof(struct ablkcipher_request) +
				      crypto_ablkcipher_reqsize(enc));

	spin_lock_init(&ctx->auth_lock);

	return 0;

err_free_hash:
	crypto_free_hash(auth);
	return err;
}

static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm)
{
	struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);

	crypto_free_hash(ctx->auth);
	crypto_free_ablkcipher(ctx->enc);
}

static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb)
{
	struct crypto_attr_type *algt;
	struct crypto_instance *inst;
	struct crypto_alg *auth;
	struct crypto_alg *enc;
	struct authenc_instance_ctx *ctx;
	const char *enc_name;
	int err;

	algt = crypto_get_attr_type(tb);
	err = PTR_ERR(algt);
	if (IS_ERR(algt))
		return ERR_PTR(err);

	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
		return ERR_PTR(-EINVAL);

	auth = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
			       CRYPTO_ALG_TYPE_HASH_MASK);
	if (IS_ERR(auth))
		return ERR_PTR(PTR_ERR(auth));

	enc_name = crypto_attr_alg_name(tb[2]);
	err = PTR_ERR(enc_name);
	if (IS_ERR(enc_name))
		goto out_put_auth;

	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
	err = -ENOMEM;
	if (!inst)
		goto out_put_auth;

	ctx = crypto_instance_ctx(inst);

	err = crypto_init_spawn(&ctx->auth, auth, inst, CRYPTO_ALG_TYPE_MASK);
	if (err)
		goto err_free_inst;

	crypto_set_skcipher_spawn(&ctx->enc, inst);
	err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
				   crypto_requires_sync(algt->type,
							algt->mask));
	if (err)
		goto err_drop_auth;

	enc = crypto_skcipher_spawn_alg(&ctx->enc);

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

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

	inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
	inst->alg.cra_flags |= enc->cra_flags & CRYPTO_ALG_ASYNC;
	inst->alg.cra_priority = enc->cra_priority * 10 + auth->cra_priority;
	inst->alg.cra_blocksize = enc->cra_blocksize;
	inst->alg.cra_alignmask = auth->cra_alignmask | enc->cra_alignmask;
	inst->alg.cra_type = &crypto_aead_type;

	inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize;
	inst->alg.cra_aead.maxauthsize = auth->cra_type == &crypto_hash_type ?
					 auth->cra_hash.digestsize :
					 auth->cra_digest.dia_digestsize;

	inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_ctx);

	inst->alg.cra_init = crypto_authenc_init_tfm;
	inst->alg.cra_exit = crypto_authenc_exit_tfm;

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

out:
	crypto_mod_put(auth);
	return inst;

err_drop_enc:
	crypto_drop_skcipher(&ctx->enc);
err_drop_auth:
	crypto_drop_spawn(&ctx->auth);
err_free_inst:
	kfree(inst);
out_put_auth:
	inst = ERR_PTR(err);
	goto out;
}

static void crypto_authenc_free(struct crypto_instance *inst)
{
	struct authenc_instance_ctx *ctx = crypto_instance_ctx(inst);

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

static struct crypto_template crypto_authenc_tmpl = {
	.name = "authenc",
	.alloc = crypto_authenc_alloc,
	.free = crypto_authenc_free,
	.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);
}

module_init(crypto_authenc_module_init);
module_exit(crypto_authenc_module_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec");
Commit	Line	Data
3c09f17c HX	1	/*
	2	* Authenc: Simple AEAD wrapper for IPsec
	3	*
	4	* Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License as published by the Free
	8	* Software Foundation; either version 2 of the License, or (at your option)
	9	* any later version.
	10	*
	11	*/
	12
9ffde35a	13	#include <crypto/internal/skcipher.h>
e236d4a8	14	#include <crypto/authenc.h>
42c271c6	15	#include <crypto/scatterwalk.h>
3c09f17c HX	16	#include <linux/err.h>
	17	#include <linux/init.h>
	18	#include <linux/kernel.h>
	19	#include <linux/module.h>
e236d4a8	20	#include <linux/rtnetlink.h>
3c09f17c HX	21	#include <linux/slab.h>
	22	#include <linux/spinlock.h>
	23
3c09f17c HX	24	struct authenc_instance_ctx {
3c09f17c HX	25	struct crypto_spawn auth;
9ffde35a	26	struct crypto_skcipher_spawn enc;
3c09f17c HX	27	};
	28
	29	struct crypto_authenc_ctx {
	30	spinlock_t auth_lock;
	31	struct crypto_hash *auth;
	32	struct crypto_ablkcipher *enc;
	33	};
	34
	35	static int crypto_authenc_setkey(struct crypto_aead authenc, const u8 key,
	36	unsigned int keylen)
	37	{
3c09f17c	38	unsigned int authkeylen;
e236d4a8	39	unsigned int enckeylen;
3c09f17c HX	40	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	41	struct crypto_hash *auth = ctx->auth;
	42	struct crypto_ablkcipher *enc = ctx->enc;
e236d4a8 HX	43	struct rtattr rta = (void )key;
e236d4a8 HX	44	struct crypto_authenc_key_param *param;
3c09f17c HX	45	int err = -EINVAL;
3c09f17c HX	46
12dc5e62	47	if (!RTA_OK(rta, keylen))
e236d4a8 HX	48	goto badkey;
	49	if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM)
	50	goto badkey;
	51	if (RTA_PAYLOAD(rta) < sizeof(*param))
	52	goto badkey;
	53
	54	param = RTA_DATA(rta);
	55	enckeylen = be32_to_cpu(param->enckeylen);
	56
	57	key += RTA_ALIGN(rta->rta_len);
	58	keylen -= RTA_ALIGN(rta->rta_len);
	59
	60	if (keylen < enckeylen)
	61	goto badkey;
	62
3c09f17c HX	63	authkeylen = keylen - enckeylen;
	64
	65	crypto_hash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
	66	crypto_hash_set_flags(auth, crypto_aead_get_flags(authenc) &
	67	CRYPTO_TFM_REQ_MASK);
	68	err = crypto_hash_setkey(auth, key, authkeylen);
	69	crypto_aead_set_flags(authenc, crypto_hash_get_flags(auth) &
	70	CRYPTO_TFM_RES_MASK);
	71
	72	if (err)
	73	goto out;
	74
	75	crypto_ablkcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
	76	crypto_ablkcipher_set_flags(enc, crypto_aead_get_flags(authenc) &
	77	CRYPTO_TFM_REQ_MASK);
	78	err = crypto_ablkcipher_setkey(enc, key + authkeylen, enckeylen);
	79	crypto_aead_set_flags(authenc, crypto_ablkcipher_get_flags(enc) &
	80	CRYPTO_TFM_RES_MASK);
	81
	82	out:
	83	return err;
e236d4a8 HX	84
	85	badkey:
	86	crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN);
	87	goto out;
3c09f17c HX	88	}
3c09f17c HX	89
7c3d703f HX	90	static u8 crypto_authenc_hash(struct aead_request req, unsigned int flags,
	91	struct scatterlist *cipher,
	92	unsigned int cryptlen)
3c09f17c HX	93	{
3c09f17c HX	94	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
3c09f17c HX	95	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	96	struct crypto_hash *auth = ctx->auth;
	97	struct hash_desc desc = {
	98	.tfm = auth,
7c3d703f	99	.flags = aead_request_flags(req) & flags,
3c09f17c HX	100	};
3c09f17c HX	101	u8 *hash = aead_request_ctx(req);
3c09f17c HX	102	int err;
	103
	104	hash = (u8 *)ALIGN((unsigned long)hash + crypto_hash_alignmask(auth),
	105	crypto_hash_alignmask(auth) + 1);
	106
	107	spin_lock_bh(&ctx->auth_lock);
	108	err = crypto_hash_init(&desc);
	109	if (err)
	110	goto auth_unlock;
	111
	112	err = crypto_hash_update(&desc, req->assoc, req->assoclen);
	113	if (err)
	114	goto auth_unlock;
	115
7c3d703f	116	err = crypto_hash_update(&desc, cipher, cryptlen);
3c09f17c HX	117	if (err)
	118	goto auth_unlock;
	119
	120	err = crypto_hash_final(&desc, hash);
	121	auth_unlock:
	122	spin_unlock_bh(&ctx->auth_lock);
	123
	124	if (err)
7c3d703f HX	125	return ERR_PTR(err);
	126
	127	return hash;
	128	}
	129
	130	static int crypto_authenc_genicv(struct aead_request *req, unsigned int flags)
	131	{
	132	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	133	struct scatterlist *dst = req->dst;
	134	unsigned int cryptlen = req->cryptlen;
	135	u8 *hash;
	136
	137	hash = crypto_authenc_hash(req, flags, dst, cryptlen);
	138	if (IS_ERR(hash))
	139	return PTR_ERR(hash);
3c09f17c	140
7ba683a6 HX	141	scatterwalk_map_and_copy(hash, dst, cryptlen,
7ba683a6 HX	142	crypto_aead_authsize(authenc), 1);
3c09f17c HX	143	return 0;
	144	}
	145
	146	static void crypto_authenc_encrypt_done(struct crypto_async_request *req,
	147	int err)
	148	{
	149	if (!err)
7c3d703f	150	err = crypto_authenc_genicv(req->data, 0);
3c09f17c HX	151
	152	aead_request_complete(req->data, err);
	153	}
	154
	155	static int crypto_authenc_encrypt(struct aead_request *req)
	156	{
	157	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	158	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	159	struct ablkcipher_request *abreq = aead_request_ctx(req);
	160	int err;
	161
	162	ablkcipher_request_set_tfm(abreq, ctx->enc);
	163	ablkcipher_request_set_callback(abreq, aead_request_flags(req),
	164	crypto_authenc_encrypt_done, req);
	165	ablkcipher_request_set_crypt(abreq, req->src, req->dst, req->cryptlen,
	166	req->iv);
	167
	168	err = crypto_ablkcipher_encrypt(abreq);
	169	if (err)
	170	return err;
	171
7c3d703f	172	return crypto_authenc_genicv(req, CRYPTO_TFM_REQ_MAY_SLEEP);
3c09f17c HX	173	}
3c09f17c HX	174
481f34ae HX	175	static int crypto_authenc_verify(struct aead_request *req,
481f34ae HX	176	unsigned int cryptlen)
3c09f17c HX	177	{
3c09f17c HX	178	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
7c3d703f	179	u8 *ohash;
3c09f17c	180	u8 *ihash;
f347c4fa	181	struct scatterlist *src = req->src;
3c09f17c	182	unsigned int authsize;
3c09f17c	183
7c3d703f HX	184	ohash = crypto_authenc_hash(req, CRYPTO_TFM_REQ_MAY_SLEEP, src,
	185	cryptlen);
	186	if (IS_ERR(ohash))
	187	return PTR_ERR(ohash);
3c09f17c	188
7ba683a6	189	authsize = crypto_aead_authsize(authenc);
7c3d703f	190	ihash = ohash + authsize;
3c09f17c	191	scatterwalk_map_and_copy(ihash, src, cryptlen, authsize, 0);
fe70f5df	192	return memcmp(ihash, ohash, authsize) ? -EBADMSG: 0;
3c09f17c HX	193	}
	194
	195	static void crypto_authenc_decrypt_done(struct crypto_async_request *req,
	196	int err)
	197	{
	198	aead_request_complete(req->data, err);
	199	}
	200
	201	static int crypto_authenc_decrypt(struct aead_request *req)
	202	{
	203	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	204	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	205	struct ablkcipher_request *abreq = aead_request_ctx(req);
481f34ae HX	206	unsigned int cryptlen = req->cryptlen;
481f34ae HX	207	unsigned int authsize = crypto_aead_authsize(authenc);
3c09f17c HX	208	int err;
3c09f17c HX	209
481f34ae HX	210	if (cryptlen < authsize)
	211	return -EINVAL;
	212	cryptlen -= authsize;
	213
	214	err = crypto_authenc_verify(req, cryptlen);
3c09f17c HX	215	if (err)
	216	return err;
	217
	218	ablkcipher_request_set_tfm(abreq, ctx->enc);
	219	ablkcipher_request_set_callback(abreq, aead_request_flags(req),
	220	crypto_authenc_decrypt_done, req);
481f34ae	221	ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen,
3c09f17c HX	222	req->iv);
	223
	224	return crypto_ablkcipher_decrypt(abreq);
	225	}
	226
	227	static int crypto_authenc_init_tfm(struct crypto_tfm *tfm)
	228	{
	229	struct crypto_instance inst = (void )tfm->__crt_alg;
	230	struct authenc_instance_ctx *ictx = crypto_instance_ctx(inst);
	231	struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
	232	struct crypto_hash *auth;
	233	struct crypto_ablkcipher *enc;
3c09f17c HX	234	int err;
	235
	236	auth = crypto_spawn_hash(&ictx->auth);
	237	if (IS_ERR(auth))
	238	return PTR_ERR(auth);
	239
9ffde35a	240	enc = crypto_spawn_skcipher(&ictx->enc);
3c09f17c HX	241	err = PTR_ERR(enc);
	242	if (IS_ERR(enc))
	243	goto err_free_hash;
	244
	245	ctx->auth = auth;
	246	ctx->enc = enc;
	247	tfm->crt_aead.reqsize = max_t(unsigned int,
	248	(crypto_hash_alignmask(auth) &
	249	~(crypto_tfm_ctx_alignment() - 1)) +
7ba683a6	250	crypto_hash_digestsize(auth) * 2,
3c09f17c HX	251	sizeof(struct ablkcipher_request) +
	252	crypto_ablkcipher_reqsize(enc));
	253
	254	spin_lock_init(&ctx->auth_lock);
	255
	256	return 0;
	257
	258	err_free_hash:
	259	crypto_free_hash(auth);
	260	return err;
	261	}
	262
	263	static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm)
	264	{
	265	struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
	266
	267	crypto_free_hash(ctx->auth);
	268	crypto_free_ablkcipher(ctx->enc);
	269	}
	270
	271	static struct crypto_instance crypto_authenc_alloc(struct rtattr *tb)
	272	{
9ffde35a	273	struct crypto_attr_type *algt;
3c09f17c HX	274	struct crypto_instance *inst;
	275	struct crypto_alg *auth;
	276	struct crypto_alg *enc;
	277	struct authenc_instance_ctx *ctx;
9ffde35a	278	const char *enc_name;
3c09f17c HX	279	int err;
3c09f17c HX	280
9ffde35a HX	281	algt = crypto_get_attr_type(tb);
	282	err = PTR_ERR(algt);
	283	if (IS_ERR(algt))
3c09f17c HX	284	return ERR_PTR(err);
3c09f17c HX	285
9ffde35a HX	286	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
	287	return ERR_PTR(-EINVAL);
	288
3c09f17c HX	289	auth = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
	290	CRYPTO_ALG_TYPE_HASH_MASK);
	291	if (IS_ERR(auth))
	292	return ERR_PTR(PTR_ERR(auth));
	293
9ffde35a HX	294	enc_name = crypto_attr_alg_name(tb[2]);
	295	err = PTR_ERR(enc_name);
	296	if (IS_ERR(enc_name))
3c09f17c HX	297	goto out_put_auth;
3c09f17c HX	298
3c09f17c HX	299	inst = kzalloc(sizeof(inst) + sizeof(ctx), GFP_KERNEL);
	300	err = -ENOMEM;
	301	if (!inst)
9ffde35a	302	goto out_put_auth;
3c09f17c HX	303
3c09f17c HX	304	ctx = crypto_instance_ctx(inst);
3c09f17c HX	305
	306	err = crypto_init_spawn(&ctx->auth, auth, inst, CRYPTO_ALG_TYPE_MASK);
	307	if (err)
	308	goto err_free_inst;
	309
9ffde35a HX	310	crypto_set_skcipher_spawn(&ctx->enc, inst);
	311	err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
	312	crypto_requires_sync(algt->type,
	313	algt->mask));
3c09f17c HX	314	if (err)
	315	goto err_drop_auth;
	316
9ffde35a HX	317	enc = crypto_skcipher_spawn_alg(&ctx->enc);
	318
	319	err = -ENAMETOOLONG;
	320	if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
	321	"authenc(%s,%s)", auth->cra_name, enc->cra_name) >=
	322	CRYPTO_MAX_ALG_NAME)
	323	goto err_drop_enc;
	324
	325	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
	326	"authenc(%s,%s)", auth->cra_driver_name,
	327	enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
	328	goto err_drop_enc;
	329
	330	inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
	331	inst->alg.cra_flags \|= enc->cra_flags & CRYPTO_ALG_ASYNC;
3c09f17c HX	332	inst->alg.cra_priority = enc->cra_priority * 10 + auth->cra_priority;
3c09f17c HX	333	inst->alg.cra_blocksize = enc->cra_blocksize;
e29bc6ad	334	inst->alg.cra_alignmask = auth->cra_alignmask \| enc->cra_alignmask;
3c09f17c HX	335	inst->alg.cra_type = &crypto_aead_type;
3c09f17c HX	336
c2c61f51	337	inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize;
7ba683a6 HX	338	inst->alg.cra_aead.maxauthsize = auth->cra_type == &crypto_hash_type ?
	339	auth->cra_hash.digestsize :
	340	auth->cra_digest.dia_digestsize;
3c09f17c HX	341
	342	inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_ctx);
	343
	344	inst->alg.cra_init = crypto_authenc_init_tfm;
	345	inst->alg.cra_exit = crypto_authenc_exit_tfm;
	346
	347	inst->alg.cra_aead.setkey = crypto_authenc_setkey;
	348	inst->alg.cra_aead.encrypt = crypto_authenc_encrypt;
	349	inst->alg.cra_aead.decrypt = crypto_authenc_decrypt;
	350
	351	out:
3c09f17c HX	352	crypto_mod_put(auth);
	353	return inst;
	354
9ffde35a HX	355	err_drop_enc:
9ffde35a HX	356	crypto_drop_skcipher(&ctx->enc);
3c09f17c HX	357	err_drop_auth:
	358	crypto_drop_spawn(&ctx->auth);
	359	err_free_inst:
	360	kfree(inst);
9ffde35a	361	out_put_auth:
3c09f17c HX	362	inst = ERR_PTR(err);
	363	goto out;
	364	}
	365
	366	static void crypto_authenc_free(struct crypto_instance *inst)
	367	{
	368	struct authenc_instance_ctx *ctx = crypto_instance_ctx(inst);
	369
9ffde35a	370	crypto_drop_skcipher(&ctx->enc);
3c09f17c HX	371	crypto_drop_spawn(&ctx->auth);
	372	kfree(inst);
	373	}
	374
	375	static struct crypto_template crypto_authenc_tmpl = {
	376	.name = "authenc",
	377	.alloc = crypto_authenc_alloc,
	378	.free = crypto_authenc_free,
	379	.module = THIS_MODULE,
	380	};
	381
	382	static int __init crypto_authenc_module_init(void)
	383	{
	384	return crypto_register_template(&crypto_authenc_tmpl);
	385	}
	386
	387	static void __exit crypto_authenc_module_exit(void)
	388	{
	389	crypto_unregister_template(&crypto_authenc_tmpl);
	390	}
	391
	392	module_init(crypto_authenc_module_init);
	393	module_exit(crypto_authenc_module_exit);
	394
	395	MODULE_LICENSE("GPL");
	396	MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec");