[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 <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 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 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)
{
	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 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 = crypto_aead_authsize(authenc);
	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;
	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;
	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));

	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;

	err = crypto_attr_u32(tb[3], &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,%s,%u)", auth->cra_name,
		     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,%s,%u)", auth->cra_driver_name,
		     enc->cra_driver_name, enckeylen) >=
	    CRYPTO_MAX_ALG_NAME)
		goto err_free_inst;

	ctx = crypto_instance_ctx(inst);
	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.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>
	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
3c09f17c HX	27	unsigned int enckeylen;
	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	{
	39	struct authenc_instance_ctx *ictx =
	40	crypto_instance_ctx(crypto_aead_alg_instance(authenc));
	41	unsigned int enckeylen = ictx->enckeylen;
	42	unsigned int authkeylen;
	43	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	44	struct crypto_hash *auth = ctx->auth;
	45	struct crypto_ablkcipher *enc = ctx->enc;
	46	int err = -EINVAL;
	47
	48	if (keylen < enckeylen) {
	49	crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN);
	50	goto out;
	51	}
	52	authkeylen = keylen - enckeylen;
	53
	54	crypto_hash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
	55	crypto_hash_set_flags(auth, crypto_aead_get_flags(authenc) &
	56	CRYPTO_TFM_REQ_MASK);
	57	err = crypto_hash_setkey(auth, key, authkeylen);
	58	crypto_aead_set_flags(authenc, crypto_hash_get_flags(auth) &
	59	CRYPTO_TFM_RES_MASK);
	60
	61	if (err)
	62	goto out;
	63
	64	crypto_ablkcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
	65	crypto_ablkcipher_set_flags(enc, crypto_aead_get_flags(authenc) &
	66	CRYPTO_TFM_REQ_MASK);
	67	err = crypto_ablkcipher_setkey(enc, key + authkeylen, enckeylen);
	68	crypto_aead_set_flags(authenc, crypto_ablkcipher_get_flags(enc) &
	69	CRYPTO_TFM_RES_MASK);
	70
	71	out:
	72	return err;
	73	}
	74
	75	static int crypto_authenc_hash(struct aead_request *req)
	76	{
	77	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
3c09f17c HX	78	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	79	struct crypto_hash *auth = ctx->auth;
	80	struct hash_desc desc = {
	81	.tfm = auth,
	82	};
	83	u8 *hash = aead_request_ctx(req);
f347c4fa HX	84	struct scatterlist *dst = req->dst;
f347c4fa HX	85	unsigned int cryptlen = req->cryptlen;
3c09f17c HX	86	int err;
	87
	88	hash = (u8 *)ALIGN((unsigned long)hash + crypto_hash_alignmask(auth),
	89	crypto_hash_alignmask(auth) + 1);
	90
	91	spin_lock_bh(&ctx->auth_lock);
	92	err = crypto_hash_init(&desc);
	93	if (err)
	94	goto auth_unlock;
	95
	96	err = crypto_hash_update(&desc, req->assoc, req->assoclen);
	97	if (err)
	98	goto auth_unlock;
	99
3c09f17c HX	100	err = crypto_hash_update(&desc, dst, cryptlen);
	101	if (err)
	102	goto auth_unlock;
	103
	104	err = crypto_hash_final(&desc, hash);
	105	auth_unlock:
	106	spin_unlock_bh(&ctx->auth_lock);
	107
	108	if (err)
	109	return err;
	110
7ba683a6 HX	111	scatterwalk_map_and_copy(hash, dst, cryptlen,
7ba683a6 HX	112	crypto_aead_authsize(authenc), 1);
3c09f17c HX	113	return 0;
	114	}
	115
	116	static void crypto_authenc_encrypt_done(struct crypto_async_request *req,
	117	int err)
	118	{
	119	if (!err)
	120	err = crypto_authenc_hash(req->data);
	121
	122	aead_request_complete(req->data, err);
	123	}
	124
	125	static int crypto_authenc_encrypt(struct aead_request *req)
	126	{
	127	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	128	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	129	struct ablkcipher_request *abreq = aead_request_ctx(req);
	130	int err;
	131
	132	ablkcipher_request_set_tfm(abreq, ctx->enc);
	133	ablkcipher_request_set_callback(abreq, aead_request_flags(req),
	134	crypto_authenc_encrypt_done, req);
	135	ablkcipher_request_set_crypt(abreq, req->src, req->dst, req->cryptlen,
	136	req->iv);
	137
	138	err = crypto_ablkcipher_encrypt(abreq);
	139	if (err)
	140	return err;
	141
	142	return crypto_authenc_hash(req);
	143	}
	144
	145	static int crypto_authenc_verify(struct aead_request *req)
	146	{
	147	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
3c09f17c HX	148	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	149	struct crypto_hash *auth = ctx->auth;
	150	struct hash_desc desc = {
	151	.tfm = auth,
	152	.flags = aead_request_flags(req),
	153	};
	154	u8 *ohash = aead_request_ctx(req);
	155	u8 *ihash;
f347c4fa HX	156	struct scatterlist *src = req->src;
f347c4fa HX	157	unsigned int cryptlen = req->cryptlen;
3c09f17c HX	158	unsigned int authsize;
	159	int err;
	160
	161	ohash = (u8 *)ALIGN((unsigned long)ohash + crypto_hash_alignmask(auth),
	162	crypto_hash_alignmask(auth) + 1);
	163	ihash = ohash + crypto_hash_digestsize(auth);
	164
	165	spin_lock_bh(&ctx->auth_lock);
	166	err = crypto_hash_init(&desc);
	167	if (err)
	168	goto auth_unlock;
	169
	170	err = crypto_hash_update(&desc, req->assoc, req->assoclen);
	171	if (err)
	172	goto auth_unlock;
	173
3c09f17c HX	174	err = crypto_hash_update(&desc, src, cryptlen);
	175	if (err)
	176	goto auth_unlock;
	177
	178	err = crypto_hash_final(&desc, ohash);
	179	auth_unlock:
	180	spin_unlock_bh(&ctx->auth_lock);
	181
	182	if (err)
	183	return err;
	184
7ba683a6	185	authsize = crypto_aead_authsize(authenc);
3c09f17c HX	186	scatterwalk_map_and_copy(ihash, src, cryptlen, authsize, 0);
	187	return memcmp(ihash, ohash, authsize) ? -EINVAL : 0;
	188	}
	189
	190	static void crypto_authenc_decrypt_done(struct crypto_async_request *req,
	191	int err)
	192	{
	193	aead_request_complete(req->data, err);
	194	}
	195
	196	static int crypto_authenc_decrypt(struct aead_request *req)
	197	{
	198	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	199	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	200	struct ablkcipher_request *abreq = aead_request_ctx(req);
	201	int err;
	202
	203	err = crypto_authenc_verify(req);
	204	if (err)
	205	return err;
	206
	207	ablkcipher_request_set_tfm(abreq, ctx->enc);
	208	ablkcipher_request_set_callback(abreq, aead_request_flags(req),
	209	crypto_authenc_decrypt_done, req);
	210	ablkcipher_request_set_crypt(abreq, req->src, req->dst, req->cryptlen,
	211	req->iv);
	212
	213	return crypto_ablkcipher_decrypt(abreq);
	214	}
	215
	216	static int crypto_authenc_init_tfm(struct crypto_tfm *tfm)
	217	{
	218	struct crypto_instance inst = (void )tfm->__crt_alg;
	219	struct authenc_instance_ctx *ictx = crypto_instance_ctx(inst);
	220	struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
	221	struct crypto_hash *auth;
	222	struct crypto_ablkcipher *enc;
3c09f17c HX	223	int err;
	224
	225	auth = crypto_spawn_hash(&ictx->auth);
	226	if (IS_ERR(auth))
	227	return PTR_ERR(auth);
	228
3c09f17c HX	229	enc = crypto_spawn_ablkcipher(&ictx->enc);
	230	err = PTR_ERR(enc);
	231	if (IS_ERR(enc))
	232	goto err_free_hash;
	233
	234	ctx->auth = auth;
	235	ctx->enc = enc;
	236	tfm->crt_aead.reqsize = max_t(unsigned int,
	237	(crypto_hash_alignmask(auth) &
	238	~(crypto_tfm_ctx_alignment() - 1)) +
7ba683a6	239	crypto_hash_digestsize(auth) * 2,
3c09f17c HX	240	sizeof(struct ablkcipher_request) +
	241	crypto_ablkcipher_reqsize(enc));
	242
	243	spin_lock_init(&ctx->auth_lock);
	244
	245	return 0;
	246
	247	err_free_hash:
	248	crypto_free_hash(auth);
	249	return err;
	250	}
	251
	252	static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm)
	253	{
	254	struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
	255
	256	crypto_free_hash(ctx->auth);
	257	crypto_free_ablkcipher(ctx->enc);
	258	}
	259
	260	static struct crypto_instance crypto_authenc_alloc(struct rtattr *tb)
	261	{
	262	struct crypto_instance *inst;
	263	struct crypto_alg *auth;
	264	struct crypto_alg *enc;
	265	struct authenc_instance_ctx *ctx;
3c09f17c HX	266	unsigned int enckeylen;
	267	int err;
	268
	269	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD);
	270	if (err)
	271	return ERR_PTR(err);
	272
	273	auth = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
	274	CRYPTO_ALG_TYPE_HASH_MASK);
	275	if (IS_ERR(auth))
	276	return ERR_PTR(PTR_ERR(auth));
	277
7ba683a6	278	enc = crypto_attr_alg(tb[2], CRYPTO_ALG_TYPE_BLKCIPHER,
332f8840	279	CRYPTO_ALG_TYPE_BLKCIPHER_MASK);
3c09f17c HX	280	inst = ERR_PTR(PTR_ERR(enc));
	281	if (IS_ERR(enc))
	282	goto out_put_auth;
	283
7ba683a6	284	err = crypto_attr_u32(tb[3], &enckeylen);
3c09f17c HX	285	if (err)
	286	goto out_put_enc;
	287
	288	inst = kzalloc(sizeof(inst) + sizeof(ctx), GFP_KERNEL);
	289	err = -ENOMEM;
	290	if (!inst)
	291	goto out_put_enc;
	292
	293	err = -ENAMETOOLONG;
	294	if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
7ba683a6	295	"authenc(%s,%s,%u)", auth->cra_name,
3c09f17c HX	296	enc->cra_name, enckeylen) >= CRYPTO_MAX_ALG_NAME)
	297	goto err_free_inst;
	298
	299	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
7ba683a6 HX	300	"authenc(%s,%s,%u)", auth->cra_driver_name,
7ba683a6 HX	301	enc->cra_driver_name, enckeylen) >=
3c09f17c HX	302	CRYPTO_MAX_ALG_NAME)
	303	goto err_free_inst;
	304
	305	ctx = crypto_instance_ctx(inst);
3c09f17c HX	306	ctx->enckeylen = enckeylen;
	307
	308	err = crypto_init_spawn(&ctx->auth, auth, inst, CRYPTO_ALG_TYPE_MASK);
	309	if (err)
	310	goto err_free_inst;
	311
	312	err = crypto_init_spawn(&ctx->enc, enc, inst, CRYPTO_ALG_TYPE_MASK);
	313	if (err)
	314	goto err_drop_auth;
	315
	316	inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD \| CRYPTO_ALG_ASYNC;
	317	inst->alg.cra_priority = enc->cra_priority * 10 + auth->cra_priority;
	318	inst->alg.cra_blocksize = enc->cra_blocksize;
e29bc6ad	319	inst->alg.cra_alignmask = auth->cra_alignmask \| enc->cra_alignmask;
3c09f17c HX	320	inst->alg.cra_type = &crypto_aead_type;
	321
	322	inst->alg.cra_aead.ivsize = enc->cra_blkcipher.ivsize;
7ba683a6 HX	323	inst->alg.cra_aead.maxauthsize = auth->cra_type == &crypto_hash_type ?
	324	auth->cra_hash.digestsize :
	325	auth->cra_digest.dia_digestsize;
3c09f17c HX	326
	327	inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_ctx);
	328
	329	inst->alg.cra_init = crypto_authenc_init_tfm;
	330	inst->alg.cra_exit = crypto_authenc_exit_tfm;
	331
	332	inst->alg.cra_aead.setkey = crypto_authenc_setkey;
	333	inst->alg.cra_aead.encrypt = crypto_authenc_encrypt;
	334	inst->alg.cra_aead.decrypt = crypto_authenc_decrypt;
	335
	336	out:
	337	crypto_mod_put(enc);
	338	out_put_auth:
	339	crypto_mod_put(auth);
	340	return inst;
	341
	342	err_drop_auth:
	343	crypto_drop_spawn(&ctx->auth);
	344	err_free_inst:
	345	kfree(inst);
	346	out_put_enc:
	347	inst = ERR_PTR(err);
	348	goto out;
	349	}
	350
	351	static void crypto_authenc_free(struct crypto_instance *inst)
	352	{
	353	struct authenc_instance_ctx *ctx = crypto_instance_ctx(inst);
	354
	355	crypto_drop_spawn(&ctx->enc);
	356	crypto_drop_spawn(&ctx->auth);
	357	kfree(inst);
	358	}
	359
	360	static struct crypto_template crypto_authenc_tmpl = {
	361	.name = "authenc",
	362	.alloc = crypto_authenc_alloc,
	363	.free = crypto_authenc_free,
	364	.module = THIS_MODULE,
	365	};
	366
	367	static int __init crypto_authenc_module_init(void)
	368	{
	369	return crypto_register_template(&crypto_authenc_tmpl);
	370	}
	371
	372	static void __exit crypto_authenc_module_exit(void)
	373	{
	374	crypto_unregister_template(&crypto_authenc_tmpl);
	375	}
	376
	377	module_init(crypto_authenc_module_init);
	378	module_exit(crypto_authenc_module_exit);
	379
	380	MODULE_LICENSE("GPL");
	381	MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec");