[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/algapi.h>
#include <crypto/authenc.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>

#include "scatterwalk.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_blkcipher.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>
3c09f17c HX	15	#include <linux/err.h>
	16	#include <linux/init.h>
	17	#include <linux/kernel.h>
	18	#include <linux/module.h>
e236d4a8	19	#include <linux/rtnetlink.h>
3c09f17c HX	20	#include <linux/slab.h>
	21	#include <linux/spinlock.h>
	22
	23	#include "scatterwalk.h"
	24
	25	struct authenc_instance_ctx {
	26	struct crypto_spawn auth;
	27	struct crypto_spawn enc;
3c09f17c HX	28	};
	29
	30	struct crypto_authenc_ctx {
	31	spinlock_t auth_lock;
	32	struct crypto_hash *auth;
	33	struct crypto_ablkcipher *enc;
	34	};
	35
	36	static int crypto_authenc_setkey(struct crypto_aead authenc, const u8 key,
	37	unsigned int keylen)
	38	{
3c09f17c	39	unsigned int authkeylen;
e236d4a8	40	unsigned int enckeylen;
3c09f17c HX	41	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	42	struct crypto_hash *auth = ctx->auth;
	43	struct crypto_ablkcipher *enc = ctx->enc;
e236d4a8 HX	44	struct rtattr rta = (void )key;
e236d4a8 HX	45	struct crypto_authenc_key_param *param;
3c09f17c HX	46	int err = -EINVAL;
3c09f17c HX	47
e236d4a8 HX	48	if (keylen < sizeof(*rta))
	49	goto badkey;
	50	if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM)
	51	goto badkey;
	52	if (RTA_PAYLOAD(rta) < sizeof(*param))
	53	goto badkey;
	54
	55	param = RTA_DATA(rta);
	56	enckeylen = be32_to_cpu(param->enckeylen);
	57
	58	key += RTA_ALIGN(rta->rta_len);
	59	keylen -= RTA_ALIGN(rta->rta_len);
	60
	61	if (keylen < enckeylen)
	62	goto badkey;
	63
3c09f17c HX	64	authkeylen = keylen - enckeylen;
	65
	66	crypto_hash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
	67	crypto_hash_set_flags(auth, crypto_aead_get_flags(authenc) &
	68	CRYPTO_TFM_REQ_MASK);
	69	err = crypto_hash_setkey(auth, key, authkeylen);
	70	crypto_aead_set_flags(authenc, crypto_hash_get_flags(auth) &
	71	CRYPTO_TFM_RES_MASK);
	72
	73	if (err)
	74	goto out;
	75
	76	crypto_ablkcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
	77	crypto_ablkcipher_set_flags(enc, crypto_aead_get_flags(authenc) &
	78	CRYPTO_TFM_REQ_MASK);
	79	err = crypto_ablkcipher_setkey(enc, key + authkeylen, enckeylen);
	80	crypto_aead_set_flags(authenc, crypto_ablkcipher_get_flags(enc) &
	81	CRYPTO_TFM_RES_MASK);
	82
	83	out:
	84	return err;
e236d4a8 HX	85
	86	badkey:
	87	crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN);
	88	goto out;
3c09f17c HX	89	}
	90
	91	static int crypto_authenc_hash(struct aead_request *req)
	92	{
	93	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
3c09f17c HX	94	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	95	struct crypto_hash *auth = ctx->auth;
	96	struct hash_desc desc = {
	97	.tfm = auth,
	98	};
	99	u8 *hash = aead_request_ctx(req);
f347c4fa HX	100	struct scatterlist *dst = req->dst;
f347c4fa HX	101	unsigned int cryptlen = req->cryptlen;
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
3c09f17c HX	116	err = crypto_hash_update(&desc, dst, cryptlen);
	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)
	125	return err;
	126
7ba683a6 HX	127	scatterwalk_map_and_copy(hash, dst, cryptlen,
7ba683a6 HX	128	crypto_aead_authsize(authenc), 1);
3c09f17c HX	129	return 0;
	130	}
	131
	132	static void crypto_authenc_encrypt_done(struct crypto_async_request *req,
	133	int err)
	134	{
	135	if (!err)
	136	err = crypto_authenc_hash(req->data);
	137
	138	aead_request_complete(req->data, err);
	139	}
	140
	141	static int crypto_authenc_encrypt(struct aead_request *req)
	142	{
	143	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	144	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	145	struct ablkcipher_request *abreq = aead_request_ctx(req);
	146	int err;
	147
	148	ablkcipher_request_set_tfm(abreq, ctx->enc);
	149	ablkcipher_request_set_callback(abreq, aead_request_flags(req),
	150	crypto_authenc_encrypt_done, req);
	151	ablkcipher_request_set_crypt(abreq, req->src, req->dst, req->cryptlen,
	152	req->iv);
	153
	154	err = crypto_ablkcipher_encrypt(abreq);
	155	if (err)
	156	return err;
	157
	158	return crypto_authenc_hash(req);
	159	}
	160
481f34ae HX	161	static int crypto_authenc_verify(struct aead_request *req,
481f34ae HX	162	unsigned int cryptlen)
3c09f17c HX	163	{
3c09f17c HX	164	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
3c09f17c HX	165	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	166	struct crypto_hash *auth = ctx->auth;
	167	struct hash_desc desc = {
	168	.tfm = auth,
	169	.flags = aead_request_flags(req),
	170	};
	171	u8 *ohash = aead_request_ctx(req);
	172	u8 *ihash;
f347c4fa	173	struct scatterlist *src = req->src;
3c09f17c HX	174	unsigned int authsize;
	175	int err;
	176
	177	ohash = (u8 *)ALIGN((unsigned long)ohash + crypto_hash_alignmask(auth),
	178	crypto_hash_alignmask(auth) + 1);
	179	ihash = ohash + crypto_hash_digestsize(auth);
	180
	181	spin_lock_bh(&ctx->auth_lock);
	182	err = crypto_hash_init(&desc);
	183	if (err)
	184	goto auth_unlock;
	185
	186	err = crypto_hash_update(&desc, req->assoc, req->assoclen);
	187	if (err)
	188	goto auth_unlock;
	189
3c09f17c HX	190	err = crypto_hash_update(&desc, src, cryptlen);
	191	if (err)
	192	goto auth_unlock;
	193
	194	err = crypto_hash_final(&desc, ohash);
	195	auth_unlock:
	196	spin_unlock_bh(&ctx->auth_lock);
	197
	198	if (err)
	199	return err;
	200
7ba683a6	201	authsize = crypto_aead_authsize(authenc);
3c09f17c	202	scatterwalk_map_and_copy(ihash, src, cryptlen, authsize, 0);
fe70f5df	203	return memcmp(ihash, ohash, authsize) ? -EBADMSG: 0;
3c09f17c HX	204	}
	205
	206	static void crypto_authenc_decrypt_done(struct crypto_async_request *req,
	207	int err)
	208	{
	209	aead_request_complete(req->data, err);
	210	}
	211
	212	static int crypto_authenc_decrypt(struct aead_request *req)
	213	{
	214	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	215	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	216	struct ablkcipher_request *abreq = aead_request_ctx(req);
481f34ae HX	217	unsigned int cryptlen = req->cryptlen;
481f34ae HX	218	unsigned int authsize = crypto_aead_authsize(authenc);
3c09f17c HX	219	int err;
3c09f17c HX	220
481f34ae HX	221	if (cryptlen < authsize)
	222	return -EINVAL;
	223	cryptlen -= authsize;
	224
	225	err = crypto_authenc_verify(req, cryptlen);
3c09f17c HX	226	if (err)
	227	return err;
	228
	229	ablkcipher_request_set_tfm(abreq, ctx->enc);
	230	ablkcipher_request_set_callback(abreq, aead_request_flags(req),
	231	crypto_authenc_decrypt_done, req);
481f34ae	232	ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen,
3c09f17c HX	233	req->iv);
	234
	235	return crypto_ablkcipher_decrypt(abreq);
	236	}
	237
	238	static int crypto_authenc_init_tfm(struct crypto_tfm *tfm)
	239	{
	240	struct crypto_instance inst = (void )tfm->__crt_alg;
	241	struct authenc_instance_ctx *ictx = crypto_instance_ctx(inst);
	242	struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
	243	struct crypto_hash *auth;
	244	struct crypto_ablkcipher *enc;
3c09f17c HX	245	int err;
	246
	247	auth = crypto_spawn_hash(&ictx->auth);
	248	if (IS_ERR(auth))
	249	return PTR_ERR(auth);
	250
3c09f17c HX	251	enc = crypto_spawn_ablkcipher(&ictx->enc);
	252	err = PTR_ERR(enc);
	253	if (IS_ERR(enc))
	254	goto err_free_hash;
	255
	256	ctx->auth = auth;
	257	ctx->enc = enc;
	258	tfm->crt_aead.reqsize = max_t(unsigned int,
	259	(crypto_hash_alignmask(auth) &
	260	~(crypto_tfm_ctx_alignment() - 1)) +
7ba683a6	261	crypto_hash_digestsize(auth) * 2,
3c09f17c HX	262	sizeof(struct ablkcipher_request) +
	263	crypto_ablkcipher_reqsize(enc));
	264
	265	spin_lock_init(&ctx->auth_lock);
	266
	267	return 0;
	268
	269	err_free_hash:
	270	crypto_free_hash(auth);
	271	return err;
	272	}
	273
	274	static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm)
	275	{
	276	struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
	277
	278	crypto_free_hash(ctx->auth);
	279	crypto_free_ablkcipher(ctx->enc);
	280	}
	281
	282	static struct crypto_instance crypto_authenc_alloc(struct rtattr *tb)
	283	{
	284	struct crypto_instance *inst;
	285	struct crypto_alg *auth;
	286	struct crypto_alg *enc;
	287	struct authenc_instance_ctx *ctx;
3c09f17c HX	288	int err;
	289
	290	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD);
	291	if (err)
	292	return ERR_PTR(err);
	293
	294	auth = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
	295	CRYPTO_ALG_TYPE_HASH_MASK);
	296	if (IS_ERR(auth))
	297	return ERR_PTR(PTR_ERR(auth));
	298
7ba683a6	299	enc = crypto_attr_alg(tb[2], CRYPTO_ALG_TYPE_BLKCIPHER,
332f8840	300	CRYPTO_ALG_TYPE_BLKCIPHER_MASK);
3c09f17c HX	301	inst = ERR_PTR(PTR_ERR(enc));
	302	if (IS_ERR(enc))
	303	goto out_put_auth;
	304
3c09f17c HX	305	inst = kzalloc(sizeof(inst) + sizeof(ctx), GFP_KERNEL);
	306	err = -ENOMEM;
	307	if (!inst)
	308	goto out_put_enc;
	309
	310	err = -ENAMETOOLONG;
	311	if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
e236d4a8 HX	312	"authenc(%s,%s)", auth->cra_name, enc->cra_name) >=
e236d4a8 HX	313	CRYPTO_MAX_ALG_NAME)
3c09f17c HX	314	goto err_free_inst;
	315
	316	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
e236d4a8 HX	317	"authenc(%s,%s)", auth->cra_driver_name,
e236d4a8 HX	318	enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
3c09f17c HX	319	goto err_free_inst;
	320
	321	ctx = crypto_instance_ctx(inst);
3c09f17c HX	322
	323	err = crypto_init_spawn(&ctx->auth, auth, inst, CRYPTO_ALG_TYPE_MASK);
	324	if (err)
	325	goto err_free_inst;
	326
	327	err = crypto_init_spawn(&ctx->enc, enc, inst, CRYPTO_ALG_TYPE_MASK);
	328	if (err)
	329	goto err_drop_auth;
	330
	331	inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD \| CRYPTO_ALG_ASYNC;
	332	inst->alg.cra_priority = enc->cra_priority * 10 + auth->cra_priority;
	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;
	336
	337	inst->alg.cra_aead.ivsize = enc->cra_blkcipher.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:
	352	crypto_mod_put(enc);
	353	out_put_auth:
	354	crypto_mod_put(auth);
	355	return inst;
	356
	357	err_drop_auth:
	358	crypto_drop_spawn(&ctx->auth);
	359	err_free_inst:
	360	kfree(inst);
	361	out_put_enc:
	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
	370	crypto_drop_spawn(&ctx->enc);
	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");