[linux.git] / crypto / authenc.c

/*
 * Authenc: Simple AEAD wrapper for IPsec
 *
 * Copyright (c) 2007 Herbert Xu <[email protected]>
 *
 * 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/aead.h>
#include <crypto/internal/skcipher.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_skcipher_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 (!RTA_OK(rta, keylen))
		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 void authenc_chain(struct scatterlist *head, struct scatterlist *sg,
			  int chain)
{
	if (chain) {
		head->length += sg->length;
		sg = scatterwalk_sg_next(sg);
	}

	if (sg)
		scatterwalk_sg_chain(head, 2, sg);
	else
		sg_mark_end(head);
}

static u8 *crypto_authenc_hash(struct aead_request *req, unsigned int flags,
			       struct scatterlist *cipher,
			       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) & flags,
	};
	u8 *hash = aead_request_ctx(req);
	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, cipher, cryptlen);
	if (err)
		goto auth_unlock;

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

	if (err)
		return ERR_PTR(err);

	return hash;
}

static int crypto_authenc_genicv(struct aead_request *req, u8 *iv,
				 unsigned int flags)
{
	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	struct scatterlist *dst = req->dst;
	struct scatterlist cipher[2];
	struct page *dstp;
	unsigned int ivsize = crypto_aead_ivsize(authenc);
	unsigned int cryptlen;
	u8 *vdst;
	u8 *hash;

	dstp = sg_page(dst);
	vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset;

	sg_init_table(cipher, 2);
	sg_set_buf(cipher, iv, ivsize);
	authenc_chain(cipher, dst, vdst == iv + ivsize);

	cryptlen = req->cryptlen + ivsize;
	hash = crypto_authenc_hash(req, flags, cipher, cryptlen);
	if (IS_ERR(hash))
		return PTR_ERR(hash);

	scatterwalk_map_and_copy(hash, cipher, cryptlen,
				 crypto_aead_authsize(authenc), 1);
	return 0;
}

static void crypto_authenc_encrypt_done(struct crypto_async_request *req,
					int err)
{
	if (!err) {
		struct aead_request *areq = req->data;
		struct crypto_aead *authenc = crypto_aead_reqtfm(areq);
		struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
		struct ablkcipher_request *abreq = aead_request_ctx(areq);
		u8 *iv = (u8 *)(abreq + 1) +
			 crypto_ablkcipher_reqsize(ctx->enc);

		err = crypto_authenc_genicv(areq, iv, 0);
	}

	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);
	struct crypto_ablkcipher *enc = ctx->enc;
	struct scatterlist *dst = req->dst;
	unsigned int cryptlen = req->cryptlen;
	u8 *iv = (u8 *)(abreq + 1) + crypto_ablkcipher_reqsize(enc);
	int err;

	ablkcipher_request_set_tfm(abreq, enc);
	ablkcipher_request_set_callback(abreq, aead_request_flags(req),
					crypto_authenc_encrypt_done, req);
	ablkcipher_request_set_crypt(abreq, req->src, dst, cryptlen, req->iv);

	memcpy(iv, req->iv, crypto_aead_ivsize(authenc));

	err = crypto_ablkcipher_encrypt(abreq);
	if (err)
		return err;

	return crypto_authenc_genicv(req, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
}

static void crypto_authenc_givencrypt_done(struct crypto_async_request *req,
					   int err)
{
	if (!err) {
		struct aead_givcrypt_request *greq = req->data;

		err = crypto_authenc_genicv(&greq->areq, greq->giv, 0);
	}

	aead_request_complete(req->data, err);
}

static int crypto_authenc_givencrypt(struct aead_givcrypt_request *req)
{
	struct crypto_aead *authenc = aead_givcrypt_reqtfm(req);
	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	struct aead_request *areq = &req->areq;
	struct skcipher_givcrypt_request *greq = aead_request_ctx(areq);
	u8 *iv = req->giv;
	int err;

	skcipher_givcrypt_set_tfm(greq, ctx->enc);
	skcipher_givcrypt_set_callback(greq, aead_request_flags(areq),
				       crypto_authenc_givencrypt_done, areq);
	skcipher_givcrypt_set_crypt(greq, areq->src, areq->dst, areq->cryptlen,
				    areq->iv);
	skcipher_givcrypt_set_giv(greq, iv, req->seq);

	err = crypto_skcipher_givencrypt(greq);
	if (err)
		return err;

	return crypto_authenc_genicv(areq, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
}

static int crypto_authenc_verify(struct aead_request *req,
				 struct scatterlist *cipher,
				 unsigned int cryptlen)
{
	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	u8 *ohash;
	u8 *ihash;
	unsigned int authsize;

	ohash = crypto_authenc_hash(req, CRYPTO_TFM_REQ_MAY_SLEEP, cipher,
				    cryptlen);
	if (IS_ERR(ohash))
		return PTR_ERR(ohash);

	authsize = crypto_aead_authsize(authenc);
	ihash = ohash + authsize;
	scatterwalk_map_and_copy(ihash, cipher, cryptlen, authsize, 0);
	return memcmp(ihash, ohash, authsize) ? -EBADMSG: 0;
}

static int crypto_authenc_iverify(struct aead_request *req, u8 *iv,
				  unsigned int cryptlen)
{
	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	struct scatterlist *src = req->src;
	struct scatterlist cipher[2];
	struct page *srcp;
	unsigned int ivsize = crypto_aead_ivsize(authenc);
	u8 *vsrc;

	srcp = sg_page(src);
	vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset;

	sg_init_table(cipher, 2);
	sg_set_buf(cipher, iv, ivsize);
	authenc_chain(cipher, src, vsrc == iv + ivsize);

	return crypto_authenc_verify(req, cipher, cryptlen + ivsize);
}

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);
	u8 *iv = req->iv;
	int err;

	if (cryptlen < authsize)
		return -EINVAL;
	cryptlen -= authsize;

	err = crypto_authenc_iverify(req, iv, cryptlen);
	if (err)
		return err;

	ablkcipher_request_set_tfm(abreq, ctx->enc);
	ablkcipher_request_set_callback(abreq, aead_request_flags(req),
					req->base.complete, req->base.data);
	ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, 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_skcipher(&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 skcipher_givcrypt_request) +
				      crypto_ablkcipher_reqsize(enc) +
				      crypto_ablkcipher_ivsize(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_attr_type *algt;
	struct crypto_instance *inst;
	struct crypto_alg *auth;
	struct crypto_alg *enc;
	struct authenc_instance_ctx *ctx;
	const char *enc_name;
	int err;

	algt = crypto_get_attr_type(tb);
	err = PTR_ERR(algt);
	if (IS_ERR(algt))
		return ERR_PTR(err);

	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
		return ERR_PTR(-EINVAL);

	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_name = crypto_attr_alg_name(tb[2]);
	err = PTR_ERR(enc_name);
	if (IS_ERR(enc_name))
		goto out_put_auth;

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

	ctx = crypto_instance_ctx(inst);

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

	crypto_set_skcipher_spawn(&ctx->enc, inst);
	err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
				   crypto_requires_sync(algt->type,
							algt->mask));
	if (err)
		goto err_drop_auth;

	enc = crypto_skcipher_spawn_alg(&ctx->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_drop_enc;

	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_drop_enc;

	inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
	inst->alg.cra_flags |= enc->cra_flags & 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;
	inst->alg.cra_aead.givencrypt = crypto_authenc_givencrypt;

out:
	crypto_mod_put(auth);
	return inst;

err_drop_enc:
	crypto_drop_skcipher(&ctx->enc);
err_drop_auth:
	crypto_drop_spawn(&ctx->auth);
err_free_inst:
	kfree(inst);
out_put_auth:
	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_skcipher(&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 <[email protected]>
	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
e56dd564	13	#include <crypto/aead.h>
9ffde35a	14	#include <crypto/internal/skcipher.h>
e236d4a8	15	#include <crypto/authenc.h>
42c271c6	16	#include <crypto/scatterwalk.h>
3c09f17c HX	17	#include <linux/err.h>
	18	#include <linux/init.h>
	19	#include <linux/kernel.h>
	20	#include <linux/module.h>
e236d4a8	21	#include <linux/rtnetlink.h>
3c09f17c HX	22	#include <linux/slab.h>
	23	#include <linux/spinlock.h>
	24
3c09f17c HX	25	struct authenc_instance_ctx {
3c09f17c HX	26	struct crypto_spawn auth;
9ffde35a	27	struct crypto_skcipher_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
12dc5e62	48	if (!RTA_OK(rta, keylen))
e236d4a8 HX	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	}
3c09f17c HX	90
e56dd564 HX	91	static void authenc_chain(struct scatterlist head, struct scatterlist sg,
	92	int chain)
	93	{
	94	if (chain) {
	95	head->length += sg->length;
	96	sg = scatterwalk_sg_next(sg);
	97	}
	98
	99	if (sg)
	100	scatterwalk_sg_chain(head, 2, sg);
	101	else
	102	sg_mark_end(head);
	103	}
	104
7c3d703f HX	105	static u8 crypto_authenc_hash(struct aead_request req, unsigned int flags,
	106	struct scatterlist *cipher,
	107	unsigned int cryptlen)
3c09f17c HX	108	{
3c09f17c HX	109	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
3c09f17c HX	110	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	111	struct crypto_hash *auth = ctx->auth;
	112	struct hash_desc desc = {
	113	.tfm = auth,
7c3d703f	114	.flags = aead_request_flags(req) & flags,
3c09f17c HX	115	};
3c09f17c HX	116	u8 *hash = aead_request_ctx(req);
3c09f17c HX	117	int err;
	118
	119	hash = (u8 *)ALIGN((unsigned long)hash + crypto_hash_alignmask(auth),
	120	crypto_hash_alignmask(auth) + 1);
	121
	122	spin_lock_bh(&ctx->auth_lock);
	123	err = crypto_hash_init(&desc);
	124	if (err)
	125	goto auth_unlock;
	126
	127	err = crypto_hash_update(&desc, req->assoc, req->assoclen);
	128	if (err)
	129	goto auth_unlock;
	130
7c3d703f	131	err = crypto_hash_update(&desc, cipher, cryptlen);
3c09f17c HX	132	if (err)
	133	goto auth_unlock;
	134
	135	err = crypto_hash_final(&desc, hash);
	136	auth_unlock:
	137	spin_unlock_bh(&ctx->auth_lock);
	138
	139	if (err)
7c3d703f HX	140	return ERR_PTR(err);
	141
	142	return hash;
	143	}
	144
e56dd564 HX	145	static int crypto_authenc_genicv(struct aead_request req, u8 iv,
e56dd564 HX	146	unsigned int flags)
7c3d703f HX	147	{
	148	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	149	struct scatterlist *dst = req->dst;
e56dd564 HX	150	struct scatterlist cipher[2];
	151	struct page *dstp;
	152	unsigned int ivsize = crypto_aead_ivsize(authenc);
	153	unsigned int cryptlen;
	154	u8 *vdst;
7c3d703f HX	155	u8 *hash;
7c3d703f HX	156
e56dd564 HX	157	dstp = sg_page(dst);
	158	vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset;
	159
	160	sg_init_table(cipher, 2);
	161	sg_set_buf(cipher, iv, ivsize);
	162	authenc_chain(cipher, dst, vdst == iv + ivsize);
	163
	164	cryptlen = req->cryptlen + ivsize;
	165	hash = crypto_authenc_hash(req, flags, cipher, cryptlen);
7c3d703f HX	166	if (IS_ERR(hash))
7c3d703f HX	167	return PTR_ERR(hash);
3c09f17c	168
e56dd564	169	scatterwalk_map_and_copy(hash, cipher, cryptlen,
7ba683a6	170	crypto_aead_authsize(authenc), 1);
3c09f17c HX	171	return 0;
	172	}
	173
	174	static void crypto_authenc_encrypt_done(struct crypto_async_request *req,
	175	int err)
	176	{
e56dd564 HX	177	if (!err) {
	178	struct aead_request *areq = req->data;
	179	struct crypto_aead *authenc = crypto_aead_reqtfm(areq);
	180	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	181	struct ablkcipher_request *abreq = aead_request_ctx(areq);
	182	u8 iv = (u8 )(abreq + 1) +
	183	crypto_ablkcipher_reqsize(ctx->enc);
	184
	185	err = crypto_authenc_genicv(areq, iv, 0);
	186	}
3c09f17c HX	187
	188	aead_request_complete(req->data, err);
	189	}
	190
	191	static int crypto_authenc_encrypt(struct aead_request *req)
	192	{
	193	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	194	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	195	struct ablkcipher_request *abreq = aead_request_ctx(req);
e56dd564 HX	196	struct crypto_ablkcipher *enc = ctx->enc;
	197	struct scatterlist *dst = req->dst;
	198	unsigned int cryptlen = req->cryptlen;
	199	u8 iv = (u8 )(abreq + 1) + crypto_ablkcipher_reqsize(enc);
3c09f17c HX	200	int err;
3c09f17c HX	201
e56dd564	202	ablkcipher_request_set_tfm(abreq, enc);
3c09f17c HX	203	ablkcipher_request_set_callback(abreq, aead_request_flags(req),
3c09f17c HX	204	crypto_authenc_encrypt_done, req);
e56dd564 HX	205	ablkcipher_request_set_crypt(abreq, req->src, dst, cryptlen, req->iv);
	206
	207	memcpy(iv, req->iv, crypto_aead_ivsize(authenc));
3c09f17c HX	208
	209	err = crypto_ablkcipher_encrypt(abreq);
	210	if (err)
	211	return err;
	212
e56dd564 HX	213	return crypto_authenc_genicv(req, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
	214	}
	215
	216	static void crypto_authenc_givencrypt_done(struct crypto_async_request *req,
	217	int err)
	218	{
	219	if (!err) {
	220	struct aead_givcrypt_request *greq = req->data;
	221
	222	err = crypto_authenc_genicv(&greq->areq, greq->giv, 0);
	223	}
	224
	225	aead_request_complete(req->data, err);
	226	}
	227
	228	static int crypto_authenc_givencrypt(struct aead_givcrypt_request *req)
	229	{
	230	struct crypto_aead *authenc = aead_givcrypt_reqtfm(req);
	231	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	232	struct aead_request *areq = &req->areq;
	233	struct skcipher_givcrypt_request *greq = aead_request_ctx(areq);
	234	u8 *iv = req->giv;
	235	int err;
	236
	237	skcipher_givcrypt_set_tfm(greq, ctx->enc);
	238	skcipher_givcrypt_set_callback(greq, aead_request_flags(areq),
	239	crypto_authenc_givencrypt_done, areq);
	240	skcipher_givcrypt_set_crypt(greq, areq->src, areq->dst, areq->cryptlen,
	241	areq->iv);
	242	skcipher_givcrypt_set_giv(greq, iv, req->seq);
	243
	244	err = crypto_skcipher_givencrypt(greq);
	245	if (err)
	246	return err;
	247
	248	return crypto_authenc_genicv(areq, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
3c09f17c HX	249	}
3c09f17c HX	250
481f34ae	251	static int crypto_authenc_verify(struct aead_request *req,
e56dd564	252	struct scatterlist *cipher,
481f34ae	253	unsigned int cryptlen)
3c09f17c HX	254	{
3c09f17c HX	255	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
7c3d703f	256	u8 *ohash;
3c09f17c	257	u8 *ihash;
3c09f17c	258	unsigned int authsize;
3c09f17c	259
e56dd564	260	ohash = crypto_authenc_hash(req, CRYPTO_TFM_REQ_MAY_SLEEP, cipher,
7c3d703f HX	261	cryptlen);
	262	if (IS_ERR(ohash))
	263	return PTR_ERR(ohash);
3c09f17c	264
7ba683a6	265	authsize = crypto_aead_authsize(authenc);
7c3d703f	266	ihash = ohash + authsize;
e56dd564	267	scatterwalk_map_and_copy(ihash, cipher, cryptlen, authsize, 0);
fe70f5df	268	return memcmp(ihash, ohash, authsize) ? -EBADMSG: 0;
3c09f17c HX	269	}
3c09f17c HX	270
e56dd564 HX	271	static int crypto_authenc_iverify(struct aead_request req, u8 iv,
e56dd564 HX	272	unsigned int cryptlen)
3c09f17c	273	{
e56dd564 HX	274	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	275	struct scatterlist *src = req->src;
	276	struct scatterlist cipher[2];
	277	struct page *srcp;
	278	unsigned int ivsize = crypto_aead_ivsize(authenc);
	279	u8 *vsrc;
	280
	281	srcp = sg_page(src);
	282	vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset;
	283
	284	sg_init_table(cipher, 2);
	285	sg_set_buf(cipher, iv, ivsize);
	286	authenc_chain(cipher, src, vsrc == iv + ivsize);
	287
	288	return crypto_authenc_verify(req, cipher, cryptlen + ivsize);
3c09f17c HX	289	}
	290
	291	static int crypto_authenc_decrypt(struct aead_request *req)
	292	{
	293	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	294	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	295	struct ablkcipher_request *abreq = aead_request_ctx(req);
481f34ae HX	296	unsigned int cryptlen = req->cryptlen;
481f34ae HX	297	unsigned int authsize = crypto_aead_authsize(authenc);
e56dd564	298	u8 *iv = req->iv;
3c09f17c HX	299	int err;
3c09f17c HX	300
481f34ae HX	301	if (cryptlen < authsize)
	302	return -EINVAL;
	303	cryptlen -= authsize;
	304
e56dd564	305	err = crypto_authenc_iverify(req, iv, cryptlen);
3c09f17c HX	306	if (err)
	307	return err;
	308
	309	ablkcipher_request_set_tfm(abreq, ctx->enc);
	310	ablkcipher_request_set_callback(abreq, aead_request_flags(req),
e56dd564 HX	311	req->base.complete, req->base.data);
e56dd564 HX	312	ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, iv);
3c09f17c HX	313
	314	return crypto_ablkcipher_decrypt(abreq);
	315	}
	316
	317	static int crypto_authenc_init_tfm(struct crypto_tfm *tfm)
	318	{
	319	struct crypto_instance inst = (void )tfm->__crt_alg;
	320	struct authenc_instance_ctx *ictx = crypto_instance_ctx(inst);
	321	struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
	322	struct crypto_hash *auth;
	323	struct crypto_ablkcipher *enc;
3c09f17c HX	324	int err;
	325
	326	auth = crypto_spawn_hash(&ictx->auth);
	327	if (IS_ERR(auth))
	328	return PTR_ERR(auth);
	329
9ffde35a	330	enc = crypto_spawn_skcipher(&ictx->enc);
3c09f17c HX	331	err = PTR_ERR(enc);
	332	if (IS_ERR(enc))
	333	goto err_free_hash;
	334
	335	ctx->auth = auth;
	336	ctx->enc = enc;
	337	tfm->crt_aead.reqsize = max_t(unsigned int,
	338	(crypto_hash_alignmask(auth) &
	339	~(crypto_tfm_ctx_alignment() - 1)) +
7ba683a6	340	crypto_hash_digestsize(auth) * 2,
e56dd564 HX	341	sizeof(struct skcipher_givcrypt_request) +
	342	crypto_ablkcipher_reqsize(enc) +
	343	crypto_ablkcipher_ivsize(enc));
3c09f17c HX	344
	345	spin_lock_init(&ctx->auth_lock);
	346
	347	return 0;
	348
	349	err_free_hash:
	350	crypto_free_hash(auth);
	351	return err;
	352	}
	353
	354	static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm)
	355	{
	356	struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
	357
	358	crypto_free_hash(ctx->auth);
	359	crypto_free_ablkcipher(ctx->enc);
	360	}
	361
	362	static struct crypto_instance crypto_authenc_alloc(struct rtattr *tb)
	363	{
9ffde35a	364	struct crypto_attr_type *algt;
3c09f17c HX	365	struct crypto_instance *inst;
	366	struct crypto_alg *auth;
	367	struct crypto_alg *enc;
	368	struct authenc_instance_ctx *ctx;
9ffde35a	369	const char *enc_name;
3c09f17c HX	370	int err;
3c09f17c HX	371
9ffde35a HX	372	algt = crypto_get_attr_type(tb);
	373	err = PTR_ERR(algt);
	374	if (IS_ERR(algt))
3c09f17c HX	375	return ERR_PTR(err);
3c09f17c HX	376
9ffde35a HX	377	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
	378	return ERR_PTR(-EINVAL);
	379
3c09f17c HX	380	auth = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
	381	CRYPTO_ALG_TYPE_HASH_MASK);
	382	if (IS_ERR(auth))
	383	return ERR_PTR(PTR_ERR(auth));
	384
9ffde35a HX	385	enc_name = crypto_attr_alg_name(tb[2]);
	386	err = PTR_ERR(enc_name);
	387	if (IS_ERR(enc_name))
3c09f17c HX	388	goto out_put_auth;
3c09f17c HX	389
3c09f17c HX	390	inst = kzalloc(sizeof(inst) + sizeof(ctx), GFP_KERNEL);
	391	err = -ENOMEM;
	392	if (!inst)
9ffde35a	393	goto out_put_auth;
3c09f17c HX	394
3c09f17c HX	395	ctx = crypto_instance_ctx(inst);
3c09f17c HX	396
	397	err = crypto_init_spawn(&ctx->auth, auth, inst, CRYPTO_ALG_TYPE_MASK);
	398	if (err)
	399	goto err_free_inst;
	400
9ffde35a HX	401	crypto_set_skcipher_spawn(&ctx->enc, inst);
	402	err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
	403	crypto_requires_sync(algt->type,
	404	algt->mask));
3c09f17c HX	405	if (err)
	406	goto err_drop_auth;
	407
9ffde35a HX	408	enc = crypto_skcipher_spawn_alg(&ctx->enc);
	409
	410	err = -ENAMETOOLONG;
	411	if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
	412	"authenc(%s,%s)", auth->cra_name, enc->cra_name) >=
	413	CRYPTO_MAX_ALG_NAME)
	414	goto err_drop_enc;
	415
	416	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
	417	"authenc(%s,%s)", auth->cra_driver_name,
	418	enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
	419	goto err_drop_enc;
	420
	421	inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
	422	inst->alg.cra_flags \|= enc->cra_flags & CRYPTO_ALG_ASYNC;
3c09f17c HX	423	inst->alg.cra_priority = enc->cra_priority * 10 + auth->cra_priority;
3c09f17c HX	424	inst->alg.cra_blocksize = enc->cra_blocksize;
e29bc6ad	425	inst->alg.cra_alignmask = auth->cra_alignmask \| enc->cra_alignmask;
3c09f17c HX	426	inst->alg.cra_type = &crypto_aead_type;
3c09f17c HX	427
c2c61f51	428	inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize;
7ba683a6 HX	429	inst->alg.cra_aead.maxauthsize = auth->cra_type == &crypto_hash_type ?
	430	auth->cra_hash.digestsize :
	431	auth->cra_digest.dia_digestsize;
3c09f17c HX	432
	433	inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_ctx);
	434
	435	inst->alg.cra_init = crypto_authenc_init_tfm;
	436	inst->alg.cra_exit = crypto_authenc_exit_tfm;
	437
	438	inst->alg.cra_aead.setkey = crypto_authenc_setkey;
	439	inst->alg.cra_aead.encrypt = crypto_authenc_encrypt;
	440	inst->alg.cra_aead.decrypt = crypto_authenc_decrypt;
e56dd564	441	inst->alg.cra_aead.givencrypt = crypto_authenc_givencrypt;
3c09f17c HX	442
3c09f17c HX	443	out:
3c09f17c HX	444	crypto_mod_put(auth);
	445	return inst;
	446
9ffde35a HX	447	err_drop_enc:
9ffde35a HX	448	crypto_drop_skcipher(&ctx->enc);
3c09f17c HX	449	err_drop_auth:
	450	crypto_drop_spawn(&ctx->auth);
	451	err_free_inst:
	452	kfree(inst);
9ffde35a	453	out_put_auth:
3c09f17c HX	454	inst = ERR_PTR(err);
	455	goto out;
	456	}
	457
	458	static void crypto_authenc_free(struct crypto_instance *inst)
	459	{
	460	struct authenc_instance_ctx *ctx = crypto_instance_ctx(inst);
	461
9ffde35a	462	crypto_drop_skcipher(&ctx->enc);
3c09f17c HX	463	crypto_drop_spawn(&ctx->auth);
	464	kfree(inst);
	465	}
	466
	467	static struct crypto_template crypto_authenc_tmpl = {
	468	.name = "authenc",
	469	.alloc = crypto_authenc_alloc,
	470	.free = crypto_authenc_free,
	471	.module = THIS_MODULE,
	472	};
	473
	474	static int __init crypto_authenc_module_init(void)
	475	{
	476	return crypto_register_template(&crypto_authenc_tmpl);
	477	}
	478
	479	static void __exit crypto_authenc_module_exit(void)
	480	{
	481	crypto_unregister_template(&crypto_authenc_tmpl);
	482	}
	483
	484	module_init(crypto_authenc_module_init);
	485	module_exit(crypto_authenc_module_exit);
	486
	487	MODULE_LICENSE("GPL");
	488	MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec");