[mirror_ubuntu-zesty-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 <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;
	unsigned int 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;

	cryptlen = req->cryptlen;
	dst = req->dst;
	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;
	unsigned int 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;

	cryptlen = req->cryptlen;
	src = req->src;
	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_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 = max(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);
87	struct scatterlist *dst;
88	unsigned int cryptlen;
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
103	cryptlen = req->cryptlen;
104	dst = req->dst;
105	err = crypto_hash_update(&desc, dst, cryptlen);
106	if (err)
107	goto auth_unlock;
108
109	err = crypto_hash_final(&desc, hash);
110	auth_unlock:
111	spin_unlock_bh(&ctx->auth_lock);
112
113	if (err)
114	return err;
115
116	scatterwalk_map_and_copy(hash, dst, cryptlen, ictx->authsize, 1);
117	return 0;
118	}
119
120	static void crypto_authenc_encrypt_done(struct crypto_async_request *req,
121	int err)
122	{
123	if (!err)
124	err = crypto_authenc_hash(req->data);
125
126	aead_request_complete(req->data, err);
127	}
128
129	static int crypto_authenc_encrypt(struct aead_request *req)
130	{
131	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
132	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
133	struct ablkcipher_request *abreq = aead_request_ctx(req);
134	int err;
135
136	ablkcipher_request_set_tfm(abreq, ctx->enc);
137	ablkcipher_request_set_callback(abreq, aead_request_flags(req),
138	crypto_authenc_encrypt_done, req);
139	ablkcipher_request_set_crypt(abreq, req->src, req->dst, req->cryptlen,
140	req->iv);
141
142	err = crypto_ablkcipher_encrypt(abreq);
143	if (err)
144	return err;
145
146	return crypto_authenc_hash(req);
147	}
148
149	static int crypto_authenc_verify(struct aead_request *req)
150	{
151	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
152	struct authenc_instance_ctx *ictx =
153	crypto_instance_ctx(crypto_aead_alg_instance(authenc));
154	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
155	struct crypto_hash *auth = ctx->auth;
156	struct hash_desc desc = {
157	.tfm = auth,
158	.flags = aead_request_flags(req),
159	};
160	u8 *ohash = aead_request_ctx(req);
161	u8 *ihash;
162	struct scatterlist *src;
163	unsigned int cryptlen;
164	unsigned int authsize;
165	int err;
166
167	ohash = (u8 *)ALIGN((unsigned long)ohash + crypto_hash_alignmask(auth),
168	crypto_hash_alignmask(auth) + 1);
169	ihash = ohash + crypto_hash_digestsize(auth);
170
171	spin_lock_bh(&ctx->auth_lock);
172	err = crypto_hash_init(&desc);
173	if (err)
174	goto auth_unlock;
175
176	err = crypto_hash_update(&desc, req->assoc, req->assoclen);
177	if (err)
178	goto auth_unlock;
179
180	cryptlen = req->cryptlen;
181	src = req->src;
182	err = crypto_hash_update(&desc, src, cryptlen);
183	if (err)
184	goto auth_unlock;
185
186	err = crypto_hash_final(&desc, ohash);
187	auth_unlock:
188	spin_unlock_bh(&ctx->auth_lock);
189
190	if (err)
191	return err;
192
193	authsize = ictx->authsize;
194	scatterwalk_map_and_copy(ihash, src, cryptlen, authsize, 0);
195	return memcmp(ihash, ohash, authsize) ? -EINVAL : 0;
196	}
197
198	static void crypto_authenc_decrypt_done(struct crypto_async_request *req,
199	int err)
200	{
201	aead_request_complete(req->data, err);
202	}
203
204	static int crypto_authenc_decrypt(struct aead_request *req)
205	{
206	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
207	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
208	struct ablkcipher_request *abreq = aead_request_ctx(req);
209	int err;
210
211	err = crypto_authenc_verify(req);
212	if (err)
213	return err;
214
215	ablkcipher_request_set_tfm(abreq, ctx->enc);
216	ablkcipher_request_set_callback(abreq, aead_request_flags(req),
217	crypto_authenc_decrypt_done, req);
218	ablkcipher_request_set_crypt(abreq, req->src, req->dst, req->cryptlen,
219	req->iv);
220
221	return crypto_ablkcipher_decrypt(abreq);
222	}
223
224	static int crypto_authenc_init_tfm(struct crypto_tfm *tfm)
225	{
226	struct crypto_instance inst = (void )tfm->__crt_alg;
227	struct authenc_instance_ctx *ictx = crypto_instance_ctx(inst);
228	struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
229	struct crypto_hash *auth;
230	struct crypto_ablkcipher *enc;
231	unsigned int digestsize;
232	int err;
233
234	auth = crypto_spawn_hash(&ictx->auth);
235	if (IS_ERR(auth))
236	return PTR_ERR(auth);
237
238	err = -EINVAL;
239	digestsize = crypto_hash_digestsize(auth);
240	if (ictx->authsize > digestsize)
241	goto err_free_hash;
242
243	enc = crypto_spawn_ablkcipher(&ictx->enc);
244	err = PTR_ERR(enc);
245	if (IS_ERR(enc))
246	goto err_free_hash;
247
248	ctx->auth = auth;
249	ctx->enc = enc;
250	tfm->crt_aead.reqsize = max_t(unsigned int,
251	(crypto_hash_alignmask(auth) &
252	~(crypto_tfm_ctx_alignment() - 1)) +
253	digestsize * 2,
254	sizeof(struct ablkcipher_request) +
255	crypto_ablkcipher_reqsize(enc));
256
257	spin_lock_init(&ctx->auth_lock);
258
259	return 0;
260
261	err_free_hash:
262	crypto_free_hash(auth);
263	return err;
264	}
265
266	static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm)
267	{
268	struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
269
270	crypto_free_hash(ctx->auth);
271	crypto_free_ablkcipher(ctx->enc);
272	}
273
274	static struct crypto_instance crypto_authenc_alloc(struct rtattr *tb)
275	{
276	struct crypto_instance *inst;
277	struct crypto_alg *auth;
278	struct crypto_alg *enc;
279	struct authenc_instance_ctx *ctx;
280	unsigned int authsize;
281	unsigned int enckeylen;
282	int err;
283
284	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD);
285	if (err)
286	return ERR_PTR(err);
287
288	auth = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
289	CRYPTO_ALG_TYPE_HASH_MASK);
290	if (IS_ERR(auth))
291	return ERR_PTR(PTR_ERR(auth));
292
293	err = crypto_attr_u32(tb[2], &authsize);
294	inst = ERR_PTR(err);
295	if (err)
296	goto out_put_auth;
297
298	enc = crypto_attr_alg(tb[3], CRYPTO_ALG_TYPE_BLKCIPHER,
299	CRYPTO_ALG_TYPE_MASK);
300	inst = ERR_PTR(PTR_ERR(enc));
301	if (IS_ERR(enc))
302	goto out_put_auth;
303
304	err = crypto_attr_u32(tb[4], &enckeylen);
305	if (err)
306	goto out_put_enc;
307
308	inst = kzalloc(sizeof(inst) + sizeof(ctx), GFP_KERNEL);
309	err = -ENOMEM;
310	if (!inst)
311	goto out_put_enc;
312
313	err = -ENAMETOOLONG;
314	if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
315	"authenc(%s, %u, %s, %u)", auth->cra_name, authsize,
316	enc->cra_name, enckeylen) >= CRYPTO_MAX_ALG_NAME)
317	goto err_free_inst;
318
319	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
320	"authenc(%s, %u, %s, %u)", auth->cra_driver_name,
321	authsize, enc->cra_driver_name, enckeylen) >=
322	CRYPTO_MAX_ALG_NAME)
323	goto err_free_inst;
324
325	ctx = crypto_instance_ctx(inst);
326	ctx->authsize = authsize;
327	ctx->enckeylen = enckeylen;
328
329	err = crypto_init_spawn(&ctx->auth, auth, inst, CRYPTO_ALG_TYPE_MASK);
330	if (err)
331	goto err_free_inst;
332
333	err = crypto_init_spawn(&ctx->enc, enc, inst, CRYPTO_ALG_TYPE_MASK);
334	if (err)
335	goto err_drop_auth;
336
337	inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD \| CRYPTO_ALG_ASYNC;
338	inst->alg.cra_priority = enc->cra_priority * 10 + auth->cra_priority;
339	inst->alg.cra_blocksize = enc->cra_blocksize;
340	inst->alg.cra_alignmask = max(auth->cra_alignmask, enc->cra_alignmask);
341	inst->alg.cra_type = &crypto_aead_type;
342
343	inst->alg.cra_aead.ivsize = enc->cra_blkcipher.ivsize;
344	inst->alg.cra_aead.authsize = authsize;
345
346	inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_ctx);
347
348	inst->alg.cra_init = crypto_authenc_init_tfm;
349	inst->alg.cra_exit = crypto_authenc_exit_tfm;
350
351	inst->alg.cra_aead.setkey = crypto_authenc_setkey;
352	inst->alg.cra_aead.encrypt = crypto_authenc_encrypt;
353	inst->alg.cra_aead.decrypt = crypto_authenc_decrypt;
354
355	out:
356	crypto_mod_put(enc);
357	out_put_auth:
358	crypto_mod_put(auth);
359	return inst;
360
361	err_drop_auth:
362	crypto_drop_spawn(&ctx->auth);
363	err_free_inst:
364	kfree(inst);
365	out_put_enc:
366	inst = ERR_PTR(err);
367	goto out;
368	}
369
370	static void crypto_authenc_free(struct crypto_instance *inst)
371	{
372	struct authenc_instance_ctx *ctx = crypto_instance_ctx(inst);
373
374	crypto_drop_spawn(&ctx->enc);
375	crypto_drop_spawn(&ctx->auth);
376	kfree(inst);
377	}
378
379	static struct crypto_template crypto_authenc_tmpl = {
380	.name = "authenc",
381	.alloc = crypto_authenc_alloc,
382	.free = crypto_authenc_free,
383	.module = THIS_MODULE,
384	};
385
386	static int __init crypto_authenc_module_init(void)
387	{
388	return crypto_register_template(&crypto_authenc_tmpl);
389	}
390
391	static void __exit crypto_authenc_module_exit(void)
392	{
393	crypto_unregister_template(&crypto_authenc_tmpl);
394	}
395
396	module_init(crypto_authenc_module_init);
397	module_exit(crypto_authenc_module_exit);
398
399	MODULE_LICENSE("GPL");
400	MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec");