[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/hash.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;

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

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

	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)
{
	struct aead_request *areq = req->data;

	if (!err) {
		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(areq, 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)
{
	struct aead_request *areq = req->data;

	if (!err) {
		struct skcipher_givcrypt_request *greq = aead_request_ctx(areq);

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

	aead_request_complete(areq, 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;

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

	return crypto_authenc_verify(req, src, 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_type ?
					 __crypto_shash_alg(auth)->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>
5f7082ed	14	#include <crypto/internal/hash.h>
9ffde35a	15	#include <crypto/internal/skcipher.h>
e236d4a8	16	#include <crypto/authenc.h>
42c271c6	17	#include <crypto/scatterwalk.h>
3c09f17c HX	18	#include <linux/err.h>
	19	#include <linux/init.h>
	20	#include <linux/kernel.h>
	21	#include <linux/module.h>
e236d4a8	22	#include <linux/rtnetlink.h>
3c09f17c HX	23	#include <linux/slab.h>
	24	#include <linux/spinlock.h>
	25
3c09f17c HX	26	struct authenc_instance_ctx {
3c09f17c HX	27	struct crypto_spawn auth;
9ffde35a	28	struct crypto_skcipher_spawn enc;
3c09f17c HX	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	{
3c09f17c	40	unsigned int authkeylen;
e236d4a8	41	unsigned int enckeylen;
3c09f17c HX	42	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	43	struct crypto_hash *auth = ctx->auth;
	44	struct crypto_ablkcipher *enc = ctx->enc;
e236d4a8 HX	45	struct rtattr rta = (void )key;
e236d4a8 HX	46	struct crypto_authenc_key_param *param;
3c09f17c HX	47	int err = -EINVAL;
3c09f17c HX	48
12dc5e62	49	if (!RTA_OK(rta, keylen))
e236d4a8 HX	50	goto badkey;
	51	if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM)
	52	goto badkey;
	53	if (RTA_PAYLOAD(rta) < sizeof(*param))
	54	goto badkey;
	55
	56	param = RTA_DATA(rta);
	57	enckeylen = be32_to_cpu(param->enckeylen);
	58
	59	key += RTA_ALIGN(rta->rta_len);
	60	keylen -= RTA_ALIGN(rta->rta_len);
	61
	62	if (keylen < enckeylen)
	63	goto badkey;
	64
3c09f17c HX	65	authkeylen = keylen - enckeylen;
	66
	67	crypto_hash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
	68	crypto_hash_set_flags(auth, crypto_aead_get_flags(authenc) &
	69	CRYPTO_TFM_REQ_MASK);
	70	err = crypto_hash_setkey(auth, key, authkeylen);
	71	crypto_aead_set_flags(authenc, crypto_hash_get_flags(auth) &
	72	CRYPTO_TFM_RES_MASK);
	73
	74	if (err)
	75	goto out;
	76
	77	crypto_ablkcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
	78	crypto_ablkcipher_set_flags(enc, crypto_aead_get_flags(authenc) &
	79	CRYPTO_TFM_REQ_MASK);
	80	err = crypto_ablkcipher_setkey(enc, key + authkeylen, enckeylen);
	81	crypto_aead_set_flags(authenc, crypto_ablkcipher_get_flags(enc) &
	82	CRYPTO_TFM_RES_MASK);
	83
	84	out:
	85	return err;
e236d4a8 HX	86
	87	badkey:
	88	crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN);
	89	goto out;
3c09f17c HX	90	}
3c09f17c HX	91
e56dd564 HX	92	static void authenc_chain(struct scatterlist head, struct scatterlist sg,
	93	int chain)
	94	{
	95	if (chain) {
	96	head->length += sg->length;
	97	sg = scatterwalk_sg_next(sg);
	98	}
	99
	100	if (sg)
	101	scatterwalk_sg_chain(head, 2, sg);
	102	else
	103	sg_mark_end(head);
	104	}
	105
7c3d703f HX	106	static u8 crypto_authenc_hash(struct aead_request req, unsigned int flags,
	107	struct scatterlist *cipher,
	108	unsigned int cryptlen)
3c09f17c HX	109	{
3c09f17c HX	110	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
3c09f17c HX	111	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	112	struct crypto_hash *auth = ctx->auth;
	113	struct hash_desc desc = {
	114	.tfm = auth,
7c3d703f	115	.flags = aead_request_flags(req) & flags,
3c09f17c HX	116	};
3c09f17c HX	117	u8 *hash = aead_request_ctx(req);
3c09f17c HX	118	int err;
	119
	120	hash = (u8 *)ALIGN((unsigned long)hash + crypto_hash_alignmask(auth),
	121	crypto_hash_alignmask(auth) + 1);
	122
	123	spin_lock_bh(&ctx->auth_lock);
	124	err = crypto_hash_init(&desc);
	125	if (err)
	126	goto auth_unlock;
	127
	128	err = crypto_hash_update(&desc, req->assoc, req->assoclen);
	129	if (err)
	130	goto auth_unlock;
	131
7c3d703f	132	err = crypto_hash_update(&desc, cipher, cryptlen);
3c09f17c HX	133	if (err)
	134	goto auth_unlock;
	135
	136	err = crypto_hash_final(&desc, hash);
	137	auth_unlock:
	138	spin_unlock_bh(&ctx->auth_lock);
	139
	140	if (err)
7c3d703f HX	141	return ERR_PTR(err);
	142
	143	return hash;
	144	}
	145
e56dd564 HX	146	static int crypto_authenc_genicv(struct aead_request req, u8 iv,
e56dd564 HX	147	unsigned int flags)
7c3d703f HX	148	{
	149	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	150	struct scatterlist *dst = req->dst;
e56dd564 HX	151	struct scatterlist cipher[2];
	152	struct page *dstp;
	153	unsigned int ivsize = crypto_aead_ivsize(authenc);
	154	unsigned int cryptlen;
	155	u8 *vdst;
7c3d703f HX	156	u8 *hash;
7c3d703f HX	157
e56dd564 HX	158	dstp = sg_page(dst);
	159	vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset;
	160
29b37f42 HX	161	if (ivsize) {
	162	sg_init_table(cipher, 2);
	163	sg_set_buf(cipher, iv, ivsize);
	164	authenc_chain(cipher, dst, vdst == iv + ivsize);
	165	dst = cipher;
	166	}
e56dd564 HX	167
e56dd564 HX	168	cryptlen = req->cryptlen + ivsize;
29b37f42	169	hash = crypto_authenc_hash(req, flags, dst, cryptlen);
7c3d703f HX	170	if (IS_ERR(hash))
7c3d703f HX	171	return PTR_ERR(hash);
3c09f17c	172
29b37f42	173	scatterwalk_map_and_copy(hash, dst, cryptlen,
7ba683a6	174	crypto_aead_authsize(authenc), 1);
3c09f17c HX	175	return 0;
	176	}
	177
	178	static void crypto_authenc_encrypt_done(struct crypto_async_request *req,
	179	int err)
	180	{
a697690b HX	181	struct aead_request *areq = req->data;
a697690b HX	182
e56dd564	183	if (!err) {
e56dd564 HX	184	struct crypto_aead *authenc = crypto_aead_reqtfm(areq);
	185	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	186	struct ablkcipher_request *abreq = aead_request_ctx(areq);
	187	u8 iv = (u8 )(abreq + 1) +
	188	crypto_ablkcipher_reqsize(ctx->enc);
	189
	190	err = crypto_authenc_genicv(areq, iv, 0);
	191	}
3c09f17c	192
a697690b	193	aead_request_complete(areq, err);
3c09f17c HX	194	}
	195
	196	static int crypto_authenc_encrypt(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);
e56dd564 HX	201	struct crypto_ablkcipher *enc = ctx->enc;
	202	struct scatterlist *dst = req->dst;
	203	unsigned int cryptlen = req->cryptlen;
	204	u8 iv = (u8 )(abreq + 1) + crypto_ablkcipher_reqsize(enc);
3c09f17c HX	205	int err;
3c09f17c HX	206
e56dd564	207	ablkcipher_request_set_tfm(abreq, enc);
3c09f17c HX	208	ablkcipher_request_set_callback(abreq, aead_request_flags(req),
3c09f17c HX	209	crypto_authenc_encrypt_done, req);
e56dd564 HX	210	ablkcipher_request_set_crypt(abreq, req->src, dst, cryptlen, req->iv);
	211
	212	memcpy(iv, req->iv, crypto_aead_ivsize(authenc));
3c09f17c HX	213
	214	err = crypto_ablkcipher_encrypt(abreq);
	215	if (err)
	216	return err;
	217
e56dd564 HX	218	return crypto_authenc_genicv(req, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
	219	}
	220
	221	static void crypto_authenc_givencrypt_done(struct crypto_async_request *req,
	222	int err)
	223	{
a697690b HX	224	struct aead_request *areq = req->data;
a697690b HX	225
e56dd564	226	if (!err) {
16161329	227	struct skcipher_givcrypt_request *greq = aead_request_ctx(areq);
e56dd564	228
16161329	229	err = crypto_authenc_genicv(areq, greq->giv, 0);
e56dd564 HX	230	}
e56dd564 HX	231
a697690b	232	aead_request_complete(areq, err);
e56dd564 HX	233	}
	234
	235	static int crypto_authenc_givencrypt(struct aead_givcrypt_request *req)
	236	{
	237	struct crypto_aead *authenc = aead_givcrypt_reqtfm(req);
	238	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	239	struct aead_request *areq = &req->areq;
	240	struct skcipher_givcrypt_request *greq = aead_request_ctx(areq);
	241	u8 *iv = req->giv;
	242	int err;
	243
	244	skcipher_givcrypt_set_tfm(greq, ctx->enc);
	245	skcipher_givcrypt_set_callback(greq, aead_request_flags(areq),
	246	crypto_authenc_givencrypt_done, areq);
	247	skcipher_givcrypt_set_crypt(greq, areq->src, areq->dst, areq->cryptlen,
	248	areq->iv);
	249	skcipher_givcrypt_set_giv(greq, iv, req->seq);
	250
	251	err = crypto_skcipher_givencrypt(greq);
	252	if (err)
	253	return err;
	254
	255	return crypto_authenc_genicv(areq, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
3c09f17c HX	256	}
3c09f17c HX	257
481f34ae	258	static int crypto_authenc_verify(struct aead_request *req,
e56dd564	259	struct scatterlist *cipher,
481f34ae	260	unsigned int cryptlen)
3c09f17c HX	261	{
3c09f17c HX	262	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
7c3d703f	263	u8 *ohash;
3c09f17c	264	u8 *ihash;
3c09f17c	265	unsigned int authsize;
3c09f17c	266
e56dd564	267	ohash = crypto_authenc_hash(req, CRYPTO_TFM_REQ_MAY_SLEEP, cipher,
7c3d703f HX	268	cryptlen);
	269	if (IS_ERR(ohash))
	270	return PTR_ERR(ohash);
3c09f17c	271
7ba683a6	272	authsize = crypto_aead_authsize(authenc);
7c3d703f	273	ihash = ohash + authsize;
e56dd564	274	scatterwalk_map_and_copy(ihash, cipher, cryptlen, authsize, 0);
fe70f5df	275	return memcmp(ihash, ohash, authsize) ? -EBADMSG: 0;
3c09f17c HX	276	}
3c09f17c HX	277
e56dd564 HX	278	static int crypto_authenc_iverify(struct aead_request req, u8 iv,
e56dd564 HX	279	unsigned int cryptlen)
3c09f17c	280	{
e56dd564 HX	281	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	282	struct scatterlist *src = req->src;
	283	struct scatterlist cipher[2];
	284	struct page *srcp;
	285	unsigned int ivsize = crypto_aead_ivsize(authenc);
	286	u8 *vsrc;
	287
	288	srcp = sg_page(src);
	289	vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset;
	290
29b37f42 HX	291	if (ivsize) {
	292	sg_init_table(cipher, 2);
	293	sg_set_buf(cipher, iv, ivsize);
	294	authenc_chain(cipher, src, vsrc == iv + ivsize);
	295	src = cipher;
	296	}
e56dd564	297
29b37f42	298	return crypto_authenc_verify(req, src, cryptlen + ivsize);
3c09f17c HX	299	}
	300
	301	static int crypto_authenc_decrypt(struct aead_request *req)
	302	{
	303	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
	304	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
	305	struct ablkcipher_request *abreq = aead_request_ctx(req);
481f34ae HX	306	unsigned int cryptlen = req->cryptlen;
481f34ae HX	307	unsigned int authsize = crypto_aead_authsize(authenc);
e56dd564	308	u8 *iv = req->iv;
3c09f17c HX	309	int err;
3c09f17c HX	310
481f34ae HX	311	if (cryptlen < authsize)
	312	return -EINVAL;
	313	cryptlen -= authsize;
	314
e56dd564	315	err = crypto_authenc_iverify(req, iv, cryptlen);
3c09f17c HX	316	if (err)
	317	return err;
	318
	319	ablkcipher_request_set_tfm(abreq, ctx->enc);
	320	ablkcipher_request_set_callback(abreq, aead_request_flags(req),
e56dd564 HX	321	req->base.complete, req->base.data);
e56dd564 HX	322	ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, iv);
3c09f17c HX	323
	324	return crypto_ablkcipher_decrypt(abreq);
	325	}
	326
	327	static int crypto_authenc_init_tfm(struct crypto_tfm *tfm)
	328	{
	329	struct crypto_instance inst = (void )tfm->__crt_alg;
	330	struct authenc_instance_ctx *ictx = crypto_instance_ctx(inst);
	331	struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
	332	struct crypto_hash *auth;
	333	struct crypto_ablkcipher *enc;
3c09f17c HX	334	int err;
	335
	336	auth = crypto_spawn_hash(&ictx->auth);
	337	if (IS_ERR(auth))
	338	return PTR_ERR(auth);
	339
9ffde35a	340	enc = crypto_spawn_skcipher(&ictx->enc);
3c09f17c HX	341	err = PTR_ERR(enc);
	342	if (IS_ERR(enc))
	343	goto err_free_hash;
	344
	345	ctx->auth = auth;
	346	ctx->enc = enc;
	347	tfm->crt_aead.reqsize = max_t(unsigned int,
	348	(crypto_hash_alignmask(auth) &
	349	~(crypto_tfm_ctx_alignment() - 1)) +
7ba683a6	350	crypto_hash_digestsize(auth) * 2,
e56dd564 HX	351	sizeof(struct skcipher_givcrypt_request) +
	352	crypto_ablkcipher_reqsize(enc) +
	353	crypto_ablkcipher_ivsize(enc));
3c09f17c HX	354
	355	spin_lock_init(&ctx->auth_lock);
	356
	357	return 0;
	358
	359	err_free_hash:
	360	crypto_free_hash(auth);
	361	return err;
	362	}
	363
	364	static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm)
	365	{
	366	struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
	367
	368	crypto_free_hash(ctx->auth);
	369	crypto_free_ablkcipher(ctx->enc);
	370	}
	371
	372	static struct crypto_instance crypto_authenc_alloc(struct rtattr *tb)
	373	{
9ffde35a	374	struct crypto_attr_type *algt;
3c09f17c HX	375	struct crypto_instance *inst;
	376	struct crypto_alg *auth;
	377	struct crypto_alg *enc;
	378	struct authenc_instance_ctx *ctx;
9ffde35a	379	const char *enc_name;
3c09f17c HX	380	int err;
3c09f17c HX	381
9ffde35a HX	382	algt = crypto_get_attr_type(tb);
	383	err = PTR_ERR(algt);
	384	if (IS_ERR(algt))
3c09f17c HX	385	return ERR_PTR(err);
3c09f17c HX	386
9ffde35a HX	387	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
	388	return ERR_PTR(-EINVAL);
	389
3c09f17c HX	390	auth = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
	391	CRYPTO_ALG_TYPE_HASH_MASK);
	392	if (IS_ERR(auth))
	393	return ERR_PTR(PTR_ERR(auth));
	394
9ffde35a HX	395	enc_name = crypto_attr_alg_name(tb[2]);
	396	err = PTR_ERR(enc_name);
	397	if (IS_ERR(enc_name))
3c09f17c HX	398	goto out_put_auth;
3c09f17c HX	399
3c09f17c HX	400	inst = kzalloc(sizeof(inst) + sizeof(ctx), GFP_KERNEL);
	401	err = -ENOMEM;
	402	if (!inst)
9ffde35a	403	goto out_put_auth;
3c09f17c HX	404
3c09f17c HX	405	ctx = crypto_instance_ctx(inst);
3c09f17c HX	406
	407	err = crypto_init_spawn(&ctx->auth, auth, inst, CRYPTO_ALG_TYPE_MASK);
	408	if (err)
	409	goto err_free_inst;
	410
9ffde35a HX	411	crypto_set_skcipher_spawn(&ctx->enc, inst);
	412	err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
	413	crypto_requires_sync(algt->type,
	414	algt->mask));
3c09f17c HX	415	if (err)
	416	goto err_drop_auth;
	417
9ffde35a HX	418	enc = crypto_skcipher_spawn_alg(&ctx->enc);
	419
	420	err = -ENAMETOOLONG;
	421	if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
	422	"authenc(%s,%s)", auth->cra_name, enc->cra_name) >=
	423	CRYPTO_MAX_ALG_NAME)
	424	goto err_drop_enc;
	425
	426	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
	427	"authenc(%s,%s)", auth->cra_driver_name,
	428	enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
	429	goto err_drop_enc;
	430
	431	inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
	432	inst->alg.cra_flags \|= enc->cra_flags & CRYPTO_ALG_ASYNC;
3c09f17c HX	433	inst->alg.cra_priority = enc->cra_priority * 10 + auth->cra_priority;
3c09f17c HX	434	inst->alg.cra_blocksize = enc->cra_blocksize;
e29bc6ad	435	inst->alg.cra_alignmask = auth->cra_alignmask \| enc->cra_alignmask;
3c09f17c HX	436	inst->alg.cra_type = &crypto_aead_type;
3c09f17c HX	437
c2c61f51	438	inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize;
7ba683a6 HX	439	inst->alg.cra_aead.maxauthsize = auth->cra_type == &crypto_hash_type ?
7ba683a6 HX	440	auth->cra_hash.digestsize :
5f7082ed HX	441	auth->cra_type ?
5f7082ed HX	442	__crypto_shash_alg(auth)->digestsize :
7ba683a6	443	auth->cra_digest.dia_digestsize;
3c09f17c HX	444
	445	inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_ctx);
	446
	447	inst->alg.cra_init = crypto_authenc_init_tfm;
	448	inst->alg.cra_exit = crypto_authenc_exit_tfm;
	449
	450	inst->alg.cra_aead.setkey = crypto_authenc_setkey;
	451	inst->alg.cra_aead.encrypt = crypto_authenc_encrypt;
	452	inst->alg.cra_aead.decrypt = crypto_authenc_decrypt;
e56dd564	453	inst->alg.cra_aead.givencrypt = crypto_authenc_givencrypt;
3c09f17c HX	454
3c09f17c HX	455	out:
3c09f17c HX	456	crypto_mod_put(auth);
	457	return inst;
	458
9ffde35a HX	459	err_drop_enc:
9ffde35a HX	460	crypto_drop_skcipher(&ctx->enc);
3c09f17c HX	461	err_drop_auth:
	462	crypto_drop_spawn(&ctx->auth);
	463	err_free_inst:
	464	kfree(inst);
9ffde35a	465	out_put_auth:
3c09f17c HX	466	inst = ERR_PTR(err);
	467	goto out;
	468	}
	469
	470	static void crypto_authenc_free(struct crypto_instance *inst)
	471	{
	472	struct authenc_instance_ctx *ctx = crypto_instance_ctx(inst);
	473
9ffde35a	474	crypto_drop_skcipher(&ctx->enc);
3c09f17c HX	475	crypto_drop_spawn(&ctx->auth);
	476	kfree(inst);
	477	}
	478
	479	static struct crypto_template crypto_authenc_tmpl = {
	480	.name = "authenc",
	481	.alloc = crypto_authenc_alloc,
	482	.free = crypto_authenc_free,
	483	.module = THIS_MODULE,
	484	};
	485
	486	static int __init crypto_authenc_module_init(void)
	487	{
	488	return crypto_register_template(&crypto_authenc_tmpl);
	489	}
	490
	491	static void __exit crypto_authenc_module_exit(void)
	492	{
	493	crypto_unregister_template(&crypto_authenc_tmpl);
	494	}
	495
	496	module_init(crypto_authenc_module_init);
	497	module_exit(crypto_authenc_module_exit);
	498
	499	MODULE_LICENSE("GPL");
	500	MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec");