[GitHub/mt8127/android_kernel_alcatel_ttab.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/algapi.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_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 (keylen < sizeof(*rta))
		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 int crypto_authenc_hash(struct aead_request *req)
{
	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,
	};
	u8 *hash = aead_request_ctx(req);
	struct scatterlist *dst = req->dst;
	unsigned int cryptlen = req->cryptlen;
	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, dst, cryptlen);
	if (err)
		goto auth_unlock;

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

	if (err)
		return err;

	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_hash(req->data);

	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_hash(req);
}

static int crypto_authenc_verify(struct aead_request *req,
				 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),
	};
	u8 *ohash = aead_request_ctx(req);
	u8 *ihash;
	struct scatterlist *src = req->src;
	unsigned int authsize;
	int err;

	ohash = (u8 *)ALIGN((unsigned long)ohash + crypto_hash_alignmask(auth), 
			    crypto_hash_alignmask(auth) + 1);
	ihash = ohash + crypto_hash_digestsize(auth);

	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, src, cryptlen);
	if (err)
		goto auth_unlock;

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

	if (err)
		return err;

	authsize = crypto_aead_authsize(authenc);
	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_ablkcipher(&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_instance *inst;
	struct crypto_alg *auth;
	struct crypto_alg *enc;
	struct authenc_instance_ctx *ctx;
	int err;

	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD);
	if (err)
		return ERR_PTR(err);

	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 = crypto_attr_alg(tb[2], CRYPTO_ALG_TYPE_BLKCIPHER,
			      CRYPTO_ALG_TYPE_BLKCIPHER_MASK);
	inst = ERR_PTR(PTR_ERR(enc));
	if (IS_ERR(enc))
		goto out_put_auth;

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

	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_free_inst;

	ctx = crypto_instance_ctx(inst);

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

	err = crypto_init_spawn(&ctx->enc, enc, inst, CRYPTO_ALG_TYPE_MASK);
	if (err)
		goto err_drop_auth;

	inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | 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(enc);
out_put_auth:
	crypto_mod_put(auth);
	return inst;

err_drop_auth:
	crypto_drop_spawn(&ctx->auth);
err_free_inst:
	kfree(inst);
out_put_enc:
	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_spawn(&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
	13	#include <crypto/algapi.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 {
	25	struct crypto_spawn auth;
	26	struct crypto_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
e236d4a8 HX	47	if (keylen < sizeof(*rta))
	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	}
	89
	90	static int crypto_authenc_hash(struct aead_request *req)
	91	{
	92	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
3c09f17c HX	93	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	94	struct crypto_hash *auth = ctx->auth;
	95	struct hash_desc desc = {
	96	.tfm = auth,
	97	};
	98	u8 *hash = aead_request_ctx(req);
f347c4fa HX	99	struct scatterlist *dst = req->dst;
f347c4fa HX	100	unsigned int cryptlen = req->cryptlen;
3c09f17c HX	101	int err;
	102
	103	hash = (u8 *)ALIGN((unsigned long)hash + crypto_hash_alignmask(auth),
	104	crypto_hash_alignmask(auth) + 1);
	105
	106	spin_lock_bh(&ctx->auth_lock);
	107	err = crypto_hash_init(&desc);
	108	if (err)
	109	goto auth_unlock;
	110
	111	err = crypto_hash_update(&desc, req->assoc, req->assoclen);
	112	if (err)
	113	goto auth_unlock;
	114
3c09f17c HX	115	err = crypto_hash_update(&desc, dst, cryptlen);
	116	if (err)
	117	goto auth_unlock;
	118
	119	err = crypto_hash_final(&desc, hash);
	120	auth_unlock:
	121	spin_unlock_bh(&ctx->auth_lock);
	122
	123	if (err)
	124	return err;
	125
7ba683a6 HX	126	scatterwalk_map_and_copy(hash, dst, cryptlen,
7ba683a6 HX	127	crypto_aead_authsize(authenc), 1);
3c09f17c HX	128	return 0;
	129	}
	130
	131	static void crypto_authenc_encrypt_done(struct crypto_async_request *req,
	132	int err)
	133	{
	134	if (!err)
	135	err = crypto_authenc_hash(req->data);
	136
	137	aead_request_complete(req->data, err);
	138	}
	139
	140	static int crypto_authenc_encrypt(struct aead_request *req)
	141	{
	142	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	143	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	144	struct ablkcipher_request *abreq = aead_request_ctx(req);
	145	int err;
	146
	147	ablkcipher_request_set_tfm(abreq, ctx->enc);
	148	ablkcipher_request_set_callback(abreq, aead_request_flags(req),
	149	crypto_authenc_encrypt_done, req);
	150	ablkcipher_request_set_crypt(abreq, req->src, req->dst, req->cryptlen,
	151	req->iv);
	152
	153	err = crypto_ablkcipher_encrypt(abreq);
	154	if (err)
	155	return err;
	156
	157	return crypto_authenc_hash(req);
	158	}
	159
481f34ae HX	160	static int crypto_authenc_verify(struct aead_request *req,
481f34ae HX	161	unsigned int cryptlen)
3c09f17c HX	162	{
3c09f17c HX	163	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
3c09f17c HX	164	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	165	struct crypto_hash *auth = ctx->auth;
	166	struct hash_desc desc = {
	167	.tfm = auth,
	168	.flags = aead_request_flags(req),
	169	};
	170	u8 *ohash = aead_request_ctx(req);
	171	u8 *ihash;
f347c4fa	172	struct scatterlist *src = req->src;
3c09f17c HX	173	unsigned int authsize;
	174	int err;
	175
	176	ohash = (u8 *)ALIGN((unsigned long)ohash + crypto_hash_alignmask(auth),
	177	crypto_hash_alignmask(auth) + 1);
	178	ihash = ohash + crypto_hash_digestsize(auth);
	179
	180	spin_lock_bh(&ctx->auth_lock);
	181	err = crypto_hash_init(&desc);
	182	if (err)
	183	goto auth_unlock;
	184
	185	err = crypto_hash_update(&desc, req->assoc, req->assoclen);
	186	if (err)
	187	goto auth_unlock;
	188
3c09f17c HX	189	err = crypto_hash_update(&desc, src, cryptlen);
	190	if (err)
	191	goto auth_unlock;
	192
	193	err = crypto_hash_final(&desc, ohash);
	194	auth_unlock:
	195	spin_unlock_bh(&ctx->auth_lock);
	196
	197	if (err)
	198	return err;
	199
7ba683a6	200	authsize = crypto_aead_authsize(authenc);
3c09f17c	201	scatterwalk_map_and_copy(ihash, src, cryptlen, authsize, 0);
fe70f5df	202	return memcmp(ihash, ohash, authsize) ? -EBADMSG: 0;
3c09f17c HX	203	}
	204
	205	static void crypto_authenc_decrypt_done(struct crypto_async_request *req,
	206	int err)
	207	{
	208	aead_request_complete(req->data, err);
	209	}
	210
	211	static int crypto_authenc_decrypt(struct aead_request *req)
	212	{
	213	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	214	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	215	struct ablkcipher_request *abreq = aead_request_ctx(req);
481f34ae HX	216	unsigned int cryptlen = req->cryptlen;
481f34ae HX	217	unsigned int authsize = crypto_aead_authsize(authenc);
3c09f17c HX	218	int err;
3c09f17c HX	219
481f34ae HX	220	if (cryptlen < authsize)
	221	return -EINVAL;
	222	cryptlen -= authsize;
	223
	224	err = crypto_authenc_verify(req, cryptlen);
3c09f17c HX	225	if (err)
	226	return err;
	227
	228	ablkcipher_request_set_tfm(abreq, ctx->enc);
	229	ablkcipher_request_set_callback(abreq, aead_request_flags(req),
	230	crypto_authenc_decrypt_done, req);
481f34ae	231	ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen,
3c09f17c HX	232	req->iv);
	233
	234	return crypto_ablkcipher_decrypt(abreq);
	235	}
	236
	237	static int crypto_authenc_init_tfm(struct crypto_tfm *tfm)
	238	{
	239	struct crypto_instance inst = (void )tfm->__crt_alg;
	240	struct authenc_instance_ctx *ictx = crypto_instance_ctx(inst);
	241	struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
	242	struct crypto_hash *auth;
	243	struct crypto_ablkcipher *enc;
3c09f17c HX	244	int err;
	245
	246	auth = crypto_spawn_hash(&ictx->auth);
	247	if (IS_ERR(auth))
	248	return PTR_ERR(auth);
	249
3c09f17c HX	250	enc = crypto_spawn_ablkcipher(&ictx->enc);
	251	err = PTR_ERR(enc);
	252	if (IS_ERR(enc))
	253	goto err_free_hash;
	254
	255	ctx->auth = auth;
	256	ctx->enc = enc;
	257	tfm->crt_aead.reqsize = max_t(unsigned int,
	258	(crypto_hash_alignmask(auth) &
	259	~(crypto_tfm_ctx_alignment() - 1)) +
7ba683a6	260	crypto_hash_digestsize(auth) * 2,
3c09f17c HX	261	sizeof(struct ablkcipher_request) +
	262	crypto_ablkcipher_reqsize(enc));
	263
	264	spin_lock_init(&ctx->auth_lock);
	265
	266	return 0;
	267
	268	err_free_hash:
	269	crypto_free_hash(auth);
	270	return err;
	271	}
	272
	273	static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm)
	274	{
	275	struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
	276
	277	crypto_free_hash(ctx->auth);
	278	crypto_free_ablkcipher(ctx->enc);
	279	}
	280
	281	static struct crypto_instance crypto_authenc_alloc(struct rtattr *tb)
	282	{
	283	struct crypto_instance *inst;
	284	struct crypto_alg *auth;
	285	struct crypto_alg *enc;
	286	struct authenc_instance_ctx *ctx;
3c09f17c HX	287	int err;
	288
	289	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD);
	290	if (err)
	291	return ERR_PTR(err);
	292
	293	auth = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
	294	CRYPTO_ALG_TYPE_HASH_MASK);
	295	if (IS_ERR(auth))
	296	return ERR_PTR(PTR_ERR(auth));
	297
7ba683a6	298	enc = crypto_attr_alg(tb[2], CRYPTO_ALG_TYPE_BLKCIPHER,
332f8840	299	CRYPTO_ALG_TYPE_BLKCIPHER_MASK);
3c09f17c HX	300	inst = ERR_PTR(PTR_ERR(enc));
	301	if (IS_ERR(enc))
	302	goto out_put_auth;
	303
3c09f17c HX	304	inst = kzalloc(sizeof(inst) + sizeof(ctx), GFP_KERNEL);
	305	err = -ENOMEM;
	306	if (!inst)
	307	goto out_put_enc;
	308
	309	err = -ENAMETOOLONG;
	310	if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
e236d4a8 HX	311	"authenc(%s,%s)", auth->cra_name, enc->cra_name) >=
e236d4a8 HX	312	CRYPTO_MAX_ALG_NAME)
3c09f17c HX	313	goto err_free_inst;
	314
	315	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
e236d4a8 HX	316	"authenc(%s,%s)", auth->cra_driver_name,
e236d4a8 HX	317	enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
3c09f17c HX	318	goto err_free_inst;
	319
	320	ctx = crypto_instance_ctx(inst);
3c09f17c HX	321
	322	err = crypto_init_spawn(&ctx->auth, auth, inst, CRYPTO_ALG_TYPE_MASK);
	323	if (err)
	324	goto err_free_inst;
	325
	326	err = crypto_init_spawn(&ctx->enc, enc, inst, CRYPTO_ALG_TYPE_MASK);
	327	if (err)
	328	goto err_drop_auth;
	329
	330	inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD \| CRYPTO_ALG_ASYNC;
	331	inst->alg.cra_priority = enc->cra_priority * 10 + auth->cra_priority;
	332	inst->alg.cra_blocksize = enc->cra_blocksize;
e29bc6ad	333	inst->alg.cra_alignmask = auth->cra_alignmask \| enc->cra_alignmask;
3c09f17c HX	334	inst->alg.cra_type = &crypto_aead_type;
3c09f17c HX	335
c2c61f51	336	inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize;
7ba683a6 HX	337	inst->alg.cra_aead.maxauthsize = auth->cra_type == &crypto_hash_type ?
	338	auth->cra_hash.digestsize :
	339	auth->cra_digest.dia_digestsize;
3c09f17c HX	340
	341	inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_ctx);
	342
	343	inst->alg.cra_init = crypto_authenc_init_tfm;
	344	inst->alg.cra_exit = crypto_authenc_exit_tfm;
	345
	346	inst->alg.cra_aead.setkey = crypto_authenc_setkey;
	347	inst->alg.cra_aead.encrypt = crypto_authenc_encrypt;
	348	inst->alg.cra_aead.decrypt = crypto_authenc_decrypt;
	349
	350	out:
	351	crypto_mod_put(enc);
	352	out_put_auth:
	353	crypto_mod_put(auth);
	354	return inst;
	355
	356	err_drop_auth:
	357	crypto_drop_spawn(&ctx->auth);
	358	err_free_inst:
	359	kfree(inst);
	360	out_put_enc:
	361	inst = ERR_PTR(err);
	362	goto out;
	363	}
	364
	365	static void crypto_authenc_free(struct crypto_instance *inst)
	366	{
	367	struct authenc_instance_ctx *ctx = crypto_instance_ctx(inst);
	368
	369	crypto_drop_spawn(&ctx->enc);
	370	crypto_drop_spawn(&ctx->auth);
	371	kfree(inst);
	372	}
	373
	374	static struct crypto_template crypto_authenc_tmpl = {
	375	.name = "authenc",
	376	.alloc = crypto_authenc_alloc,
	377	.free = crypto_authenc_free,
	378	.module = THIS_MODULE,
	379	};
	380
	381	static int __init crypto_authenc_module_init(void)
	382	{
	383	return crypto_register_template(&crypto_authenc_tmpl);
	384	}
	385
	386	static void __exit crypto_authenc_module_exit(void)
	387	{
	388	crypto_unregister_template(&crypto_authenc_tmpl);
	389	}
	390
	391	module_init(crypto_authenc_module_init);
	392	module_exit(crypto_authenc_module_exit);
	393
	394	MODULE_LICENSE("GPL");
	395	MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec");