[linux-2.6-block.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 <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/spinlock.h>

#include "scatterwalk.h"

struct authenc_instance_ctx {
	struct crypto_spawn auth;
	struct crypto_spawn enc;

	unsigned int authsize;
	unsigned int enckeylen;
};

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)
{
	struct authenc_instance_ctx *ictx =
		crypto_instance_ctx(crypto_aead_alg_instance(authenc));
	unsigned int enckeylen = ictx->enckeylen;
	unsigned int authkeylen;
	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	struct crypto_hash *auth = ctx->auth;
	struct crypto_ablkcipher *enc = ctx->enc;
	int err = -EINVAL;

	if (keylen < enckeylen) {
		crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN);
		goto out;
	}
	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;
}

static int crypto_authenc_hash(struct aead_request *req)
{
	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	struct authenc_instance_ctx *ictx =
		crypto_instance_ctx(crypto_aead_alg_instance(authenc));
	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, ictx->authsize, 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)
{
	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	struct authenc_instance_ctx *ictx =
		crypto_instance_ctx(crypto_aead_alg_instance(authenc));
	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 cryptlen = req->cryptlen;
	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 = ictx->authsize;
	scatterwalk_map_and_copy(ihash, src, cryptlen, authsize, 0);
	return memcmp(ihash, ohash, authsize) ? -EINVAL : 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);
	int err;

	err = crypto_authenc_verify(req);
	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, req->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;
	unsigned int digestsize;
	int err;

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

	err = -EINVAL;
	digestsize = crypto_hash_digestsize(auth);
	if (ictx->authsize > digestsize)
		goto err_free_hash;

	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)) +
				      digestsize * 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;
	unsigned int authsize;
	unsigned int enckeylen;
	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));

	err = crypto_attr_u32(tb[2], &authsize);
	inst = ERR_PTR(err);
	if (err)
		goto out_put_auth;

	enc = crypto_attr_alg(tb[3], CRYPTO_ALG_TYPE_BLKCIPHER,
			      CRYPTO_ALG_TYPE_BLKCIPHER_MASK);
	inst = ERR_PTR(PTR_ERR(enc));
	if (IS_ERR(enc))
		goto out_put_auth;

	err = crypto_attr_u32(tb[4], &enckeylen);
	if (err)
		goto out_put_enc;

	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,%u,%s,%u)", auth->cra_name, authsize,
		     enc->cra_name, enckeylen) >= CRYPTO_MAX_ALG_NAME)
		goto err_free_inst;

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

	ctx = crypto_instance_ctx(inst);
	ctx->authsize = authsize;
	ctx->enckeylen = enckeylen;

	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.authsize = authsize;

	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>
	14	#include <linux/err.h>
	15	#include <linux/init.h>
	16	#include <linux/kernel.h>
	17	#include <linux/module.h>
	18	#include <linux/slab.h>
	19	#include <linux/spinlock.h>
	20
	21	#include "scatterwalk.h"
	22
	23	struct authenc_instance_ctx {
	24	struct crypto_spawn auth;
	25	struct crypto_spawn enc;
	26
	27	unsigned int authsize;
	28	unsigned int enckeylen;
	29	};
	30
	31	struct crypto_authenc_ctx {
	32	spinlock_t auth_lock;
	33	struct crypto_hash *auth;
	34	struct crypto_ablkcipher *enc;
	35	};
	36
	37	static int crypto_authenc_setkey(struct crypto_aead authenc, const u8 key,
	38	unsigned int keylen)
	39	{
	40	struct authenc_instance_ctx *ictx =
	41	crypto_instance_ctx(crypto_aead_alg_instance(authenc));
	42	unsigned int enckeylen = ictx->enckeylen;
	43	unsigned int authkeylen;
	44	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	45	struct crypto_hash *auth = ctx->auth;
	46	struct crypto_ablkcipher *enc = ctx->enc;
	47	int err = -EINVAL;
	48
	49	if (keylen < enckeylen) {
	50	crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN);
	51	goto out;
	52	}
	53	authkeylen = keylen - enckeylen;
	54
	55	crypto_hash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
	56	crypto_hash_set_flags(auth, crypto_aead_get_flags(authenc) &
	57	CRYPTO_TFM_REQ_MASK);
	58	err = crypto_hash_setkey(auth, key, authkeylen);
	59	crypto_aead_set_flags(authenc, crypto_hash_get_flags(auth) &
	60	CRYPTO_TFM_RES_MASK);
	61
	62	if (err)
	63	goto out;
	64
65	crypto_ablkcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
66	crypto_ablkcipher_set_flags(enc, crypto_aead_get_flags(authenc) &
67	CRYPTO_TFM_REQ_MASK);
68	err = crypto_ablkcipher_setkey(enc, key + authkeylen, enckeylen);
69	crypto_aead_set_flags(authenc, crypto_ablkcipher_get_flags(enc) &
70	CRYPTO_TFM_RES_MASK);
71
72	out:
73	return err;
74	}
75
76	static int crypto_authenc_hash(struct aead_request *req)
77	{
78	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
79	struct authenc_instance_ctx *ictx =
80	crypto_instance_ctx(crypto_aead_alg_instance(authenc));
81	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
82	struct crypto_hash *auth = ctx->auth;
83	struct hash_desc desc = {
84	.tfm = auth,
85	};
86	u8 *hash = aead_request_ctx(req);
f347c4fa HX	87	struct scatterlist *dst = req->dst;
f347c4fa HX	88	unsigned int cryptlen = req->cryptlen;
3c09f17c HX	89	int err;
	90
	91	hash = (u8 *)ALIGN((unsigned long)hash + crypto_hash_alignmask(auth),
	92	crypto_hash_alignmask(auth) + 1);
	93
	94	spin_lock_bh(&ctx->auth_lock);
	95	err = crypto_hash_init(&desc);
	96	if (err)
	97	goto auth_unlock;
	98
	99	err = crypto_hash_update(&desc, req->assoc, req->assoclen);
	100	if (err)
	101	goto auth_unlock;
	102
3c09f17c HX	103	err = crypto_hash_update(&desc, dst, cryptlen);
	104	if (err)
	105	goto auth_unlock;
	106
	107	err = crypto_hash_final(&desc, hash);
	108	auth_unlock:
	109	spin_unlock_bh(&ctx->auth_lock);
	110
	111	if (err)
	112	return err;
	113
	114	scatterwalk_map_and_copy(hash, dst, cryptlen, ictx->authsize, 1);
	115	return 0;
	116	}
	117
	118	static void crypto_authenc_encrypt_done(struct crypto_async_request *req,
	119	int err)
	120	{
	121	if (!err)
	122	err = crypto_authenc_hash(req->data);
	123
	124	aead_request_complete(req->data, err);
	125	}
	126
	127	static int crypto_authenc_encrypt(struct aead_request *req)
	128	{
	129	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	130	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	131	struct ablkcipher_request *abreq = aead_request_ctx(req);
	132	int err;
	133
	134	ablkcipher_request_set_tfm(abreq, ctx->enc);
	135	ablkcipher_request_set_callback(abreq, aead_request_flags(req),
	136	crypto_authenc_encrypt_done, req);
	137	ablkcipher_request_set_crypt(abreq, req->src, req->dst, req->cryptlen,
	138	req->iv);
	139
	140	err = crypto_ablkcipher_encrypt(abreq);
	141	if (err)
	142	return err;
	143
	144	return crypto_authenc_hash(req);
	145	}
	146
	147	static int crypto_authenc_verify(struct aead_request *req)
	148	{
	149	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	150	struct authenc_instance_ctx *ictx =
	151	crypto_instance_ctx(crypto_aead_alg_instance(authenc));
	152	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	153	struct crypto_hash *auth = ctx->auth;
	154	struct hash_desc desc = {
	155	.tfm = auth,
	156	.flags = aead_request_flags(req),
	157	};
	158	u8 *ohash = aead_request_ctx(req);
	159	u8 *ihash;
f347c4fa HX	160	struct scatterlist *src = req->src;
f347c4fa HX	161	unsigned int cryptlen = req->cryptlen;
3c09f17c HX	162	unsigned int authsize;
	163	int err;
	164
	165	ohash = (u8 *)ALIGN((unsigned long)ohash + crypto_hash_alignmask(auth),
	166	crypto_hash_alignmask(auth) + 1);
	167	ihash = ohash + crypto_hash_digestsize(auth);
	168
	169	spin_lock_bh(&ctx->auth_lock);
	170	err = crypto_hash_init(&desc);
	171	if (err)
	172	goto auth_unlock;
	173
	174	err = crypto_hash_update(&desc, req->assoc, req->assoclen);
	175	if (err)
	176	goto auth_unlock;
	177
3c09f17c HX	178	err = crypto_hash_update(&desc, src, cryptlen);
	179	if (err)
	180	goto auth_unlock;
	181
	182	err = crypto_hash_final(&desc, ohash);
	183	auth_unlock:
	184	spin_unlock_bh(&ctx->auth_lock);
	185
	186	if (err)
	187	return err;
	188
	189	authsize = ictx->authsize;
	190	scatterwalk_map_and_copy(ihash, src, cryptlen, authsize, 0);
	191	return memcmp(ihash, ohash, authsize) ? -EINVAL : 0;
	192	}
	193
	194	static void crypto_authenc_decrypt_done(struct crypto_async_request *req,
	195	int err)
	196	{
	197	aead_request_complete(req->data, err);
	198	}
	199
	200	static int crypto_authenc_decrypt(struct aead_request *req)
	201	{
	202	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	203	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	204	struct ablkcipher_request *abreq = aead_request_ctx(req);
	205	int err;
	206
	207	err = crypto_authenc_verify(req);
	208	if (err)
	209	return err;
	210
	211	ablkcipher_request_set_tfm(abreq, ctx->enc);
	212	ablkcipher_request_set_callback(abreq, aead_request_flags(req),
	213	crypto_authenc_decrypt_done, req);
	214	ablkcipher_request_set_crypt(abreq, req->src, req->dst, req->cryptlen,
	215	req->iv);
	216
	217	return crypto_ablkcipher_decrypt(abreq);
	218	}
	219
	220	static int crypto_authenc_init_tfm(struct crypto_tfm *tfm)
	221	{
	222	struct crypto_instance inst = (void )tfm->__crt_alg;
	223	struct authenc_instance_ctx *ictx = crypto_instance_ctx(inst);
	224	struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
	225	struct crypto_hash *auth;
	226	struct crypto_ablkcipher *enc;
	227	unsigned int digestsize;
	228	int err;
	229
	230	auth = crypto_spawn_hash(&ictx->auth);
	231	if (IS_ERR(auth))
	232	return PTR_ERR(auth);
	233
	234	err = -EINVAL;
	235	digestsize = crypto_hash_digestsize(auth);
	236	if (ictx->authsize > digestsize)
	237	goto err_free_hash;
	238
	239	enc = crypto_spawn_ablkcipher(&ictx->enc);
	240	err = PTR_ERR(enc);
	241	if (IS_ERR(enc))
242	goto err_free_hash;
243
244	ctx->auth = auth;
245	ctx->enc = enc;
246	tfm->crt_aead.reqsize = max_t(unsigned int,
247	(crypto_hash_alignmask(auth) &
248	~(crypto_tfm_ctx_alignment() - 1)) +
249	digestsize * 2,
250	sizeof(struct ablkcipher_request) +
251	crypto_ablkcipher_reqsize(enc));
252
253	spin_lock_init(&ctx->auth_lock);
254
255	return 0;
256
257	err_free_hash:
258	crypto_free_hash(auth);
259	return err;
260	}
261
262	static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm)
263	{
264	struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
265
266	crypto_free_hash(ctx->auth);
267	crypto_free_ablkcipher(ctx->enc);
268	}
269
270	static struct crypto_instance crypto_authenc_alloc(struct rtattr *tb)
271	{
272	struct crypto_instance *inst;
273	struct crypto_alg *auth;
274	struct crypto_alg *enc;
275	struct authenc_instance_ctx *ctx;
276	unsigned int authsize;
277	unsigned int enckeylen;
278	int err;
279
280	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD);
281	if (err)
282	return ERR_PTR(err);
283
284	auth = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
285	CRYPTO_ALG_TYPE_HASH_MASK);
286	if (IS_ERR(auth))
287	return ERR_PTR(PTR_ERR(auth));
288
289	err = crypto_attr_u32(tb[2], &authsize);
290	inst = ERR_PTR(err);
291	if (err)
292	goto out_put_auth;
293
294	enc = crypto_attr_alg(tb[3], CRYPTO_ALG_TYPE_BLKCIPHER,
332f8840	295	CRYPTO_ALG_TYPE_BLKCIPHER_MASK);
3c09f17c HX	296	inst = ERR_PTR(PTR_ERR(enc));
	297	if (IS_ERR(enc))
	298	goto out_put_auth;
	299
	300	err = crypto_attr_u32(tb[4], &enckeylen);
	301	if (err)
	302	goto out_put_enc;
	303
	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,
e4c5c6c9	311	"authenc(%s,%u,%s,%u)", auth->cra_name, authsize,
3c09f17c HX	312	enc->cra_name, enckeylen) >= CRYPTO_MAX_ALG_NAME)
	313	goto err_free_inst;
	314
	315	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
e4c5c6c9	316	"authenc(%s,%u,%s,%u)", auth->cra_driver_name,
3c09f17c HX	317	authsize, enc->cra_driver_name, enckeylen) >=
	318	CRYPTO_MAX_ALG_NAME)
	319	goto err_free_inst;
	320
	321	ctx = crypto_instance_ctx(inst);
	322	ctx->authsize = authsize;
	323	ctx->enckeylen = enckeylen;
	324
	325	err = crypto_init_spawn(&ctx->auth, auth, inst, CRYPTO_ALG_TYPE_MASK);
	326	if (err)
	327	goto err_free_inst;
	328
	329	err = crypto_init_spawn(&ctx->enc, enc, inst, CRYPTO_ALG_TYPE_MASK);
	330	if (err)
	331	goto err_drop_auth;
	332
	333	inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD \| CRYPTO_ALG_ASYNC;
	334	inst->alg.cra_priority = enc->cra_priority * 10 + auth->cra_priority;
	335	inst->alg.cra_blocksize = enc->cra_blocksize;
e29bc6ad	336	inst->alg.cra_alignmask = auth->cra_alignmask \| enc->cra_alignmask;
3c09f17c HX	337	inst->alg.cra_type = &crypto_aead_type;
	338
	339	inst->alg.cra_aead.ivsize = enc->cra_blkcipher.ivsize;
	340	inst->alg.cra_aead.authsize = authsize;
	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");