[linux-block.git] / crypto / authencesn.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * authencesn.c - AEAD wrapper for IPsec with extended sequence numbers,
 *                 derived from authenc.c
 *
 * Copyright (C) 2010 secunet Security Networks AG
 * Copyright (C) 2010 Steffen Klassert <steffen.klassert@secunet.com>
 * Copyright (c) 2015 Herbert Xu <herbert@gondor.apana.org.au>
 */

#include <crypto/internal/aead.h>
#include <crypto/internal/hash.h>
#include <crypto/internal/skcipher.h>
#include <crypto/authenc.h>
#include <crypto/null.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_esn_instance_ctx {
	struct crypto_ahash_spawn auth;
	struct crypto_skcipher_spawn enc;
};

struct crypto_authenc_esn_ctx {
	unsigned int reqoff;
	struct crypto_ahash *auth;
	struct crypto_skcipher *enc;
	struct crypto_sync_skcipher *null;
};

struct authenc_esn_request_ctx {
	struct scatterlist src[2];
	struct scatterlist dst[2];
	char tail[];
};

static void authenc_esn_request_complete(struct aead_request *req, int err)
{
	if (err != -EINPROGRESS)
		aead_request_complete(req, err);
}

static int crypto_authenc_esn_setauthsize(struct crypto_aead *authenc_esn,
					  unsigned int authsize)
{
	if (authsize > 0 && authsize < 4)
		return -EINVAL;

	return 0;
}

static int crypto_authenc_esn_setkey(struct crypto_aead *authenc_esn, const u8 *key,
				     unsigned int keylen)
{
	struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
	struct crypto_ahash *auth = ctx->auth;
	struct crypto_skcipher *enc = ctx->enc;
	struct crypto_authenc_keys keys;
	int err = -EINVAL;

	if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
		goto out;

	crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
	crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc_esn) &
				     CRYPTO_TFM_REQ_MASK);
	err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen);
	if (err)
		goto out;

	crypto_skcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
	crypto_skcipher_set_flags(enc, crypto_aead_get_flags(authenc_esn) &
					 CRYPTO_TFM_REQ_MASK);
	err = crypto_skcipher_setkey(enc, keys.enckey, keys.enckeylen);
out:
	memzero_explicit(&keys, sizeof(keys));
	return err;
}

static int crypto_authenc_esn_genicv_tail(struct aead_request *req,
					  unsigned int flags)
{
	struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
	struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
	struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
	struct crypto_ahash *auth = ctx->auth;
	u8 *hash = PTR_ALIGN((u8 *)areq_ctx->tail,
			     crypto_ahash_alignmask(auth) + 1);
	unsigned int authsize = crypto_aead_authsize(authenc_esn);
	unsigned int assoclen = req->assoclen;
	unsigned int cryptlen = req->cryptlen;
	struct scatterlist *dst = req->dst;
	u32 tmp[2];

	/* Move high-order bits of sequence number back. */
	scatterwalk_map_and_copy(tmp, dst, 4, 4, 0);
	scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 0);
	scatterwalk_map_and_copy(tmp, dst, 0, 8, 1);

	scatterwalk_map_and_copy(hash, dst, assoclen + cryptlen, authsize, 1);
	return 0;
}

static void authenc_esn_geniv_ahash_done(void *data, int err)
{
	struct aead_request *req = data;

	err = err ?: crypto_authenc_esn_genicv_tail(req, 0);
	aead_request_complete(req, err);
}

static int crypto_authenc_esn_genicv(struct aead_request *req,
				     unsigned int flags)
{
	struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
	struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
	struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
	struct crypto_ahash *auth = ctx->auth;
	u8 *hash = PTR_ALIGN((u8 *)areq_ctx->tail,
			     crypto_ahash_alignmask(auth) + 1);
	struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
	unsigned int authsize = crypto_aead_authsize(authenc_esn);
	unsigned int assoclen = req->assoclen;
	unsigned int cryptlen = req->cryptlen;
	struct scatterlist *dst = req->dst;
	u32 tmp[2];

	if (!authsize)
		return 0;

	/* Move high-order bits of sequence number to the end. */
	scatterwalk_map_and_copy(tmp, dst, 0, 8, 0);
	scatterwalk_map_and_copy(tmp, dst, 4, 4, 1);
	scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 1);

	sg_init_table(areq_ctx->dst, 2);
	dst = scatterwalk_ffwd(areq_ctx->dst, dst, 4);

	ahash_request_set_tfm(ahreq, auth);
	ahash_request_set_crypt(ahreq, dst, hash, assoclen + cryptlen);
	ahash_request_set_callback(ahreq, flags,
				   authenc_esn_geniv_ahash_done, req);

	return crypto_ahash_digest(ahreq) ?:
	       crypto_authenc_esn_genicv_tail(req, aead_request_flags(req));
}


static void crypto_authenc_esn_encrypt_done(void *data, int err)
{
	struct aead_request *areq = data;

	if (!err)
		err = crypto_authenc_esn_genicv(areq, 0);

	authenc_esn_request_complete(areq, err);
}

static int crypto_authenc_esn_copy(struct aead_request *req, unsigned int len)
{
	struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
	struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
	SYNC_SKCIPHER_REQUEST_ON_STACK(skreq, ctx->null);

	skcipher_request_set_sync_tfm(skreq, ctx->null);
	skcipher_request_set_callback(skreq, aead_request_flags(req),
				      NULL, NULL);
	skcipher_request_set_crypt(skreq, req->src, req->dst, len, NULL);

	return crypto_skcipher_encrypt(skreq);
}

static int crypto_authenc_esn_encrypt(struct aead_request *req)
{
	struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
	struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
	struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
	struct skcipher_request *skreq = (void *)(areq_ctx->tail +
						  ctx->reqoff);
	struct crypto_skcipher *enc = ctx->enc;
	unsigned int assoclen = req->assoclen;
	unsigned int cryptlen = req->cryptlen;
	struct scatterlist *src, *dst;
	int err;

	sg_init_table(areq_ctx->src, 2);
	src = scatterwalk_ffwd(areq_ctx->src, req->src, assoclen);
	dst = src;

	if (req->src != req->dst) {
		err = crypto_authenc_esn_copy(req, assoclen);
		if (err)
			return err;

		sg_init_table(areq_ctx->dst, 2);
		dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, assoclen);
	}

	skcipher_request_set_tfm(skreq, enc);
	skcipher_request_set_callback(skreq, aead_request_flags(req),
				      crypto_authenc_esn_encrypt_done, req);
	skcipher_request_set_crypt(skreq, src, dst, cryptlen, req->iv);

	err = crypto_skcipher_encrypt(skreq);
	if (err)
		return err;

	return crypto_authenc_esn_genicv(req, aead_request_flags(req));
}

static int crypto_authenc_esn_decrypt_tail(struct aead_request *req,
					   unsigned int flags)
{
	struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
	unsigned int authsize = crypto_aead_authsize(authenc_esn);
	struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
	struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
	struct skcipher_request *skreq = (void *)(areq_ctx->tail +
						  ctx->reqoff);
	struct crypto_ahash *auth = ctx->auth;
	u8 *ohash = PTR_ALIGN((u8 *)areq_ctx->tail,
			      crypto_ahash_alignmask(auth) + 1);
	unsigned int cryptlen = req->cryptlen - authsize;
	unsigned int assoclen = req->assoclen;
	struct scatterlist *dst = req->dst;
	u8 *ihash = ohash + crypto_ahash_digestsize(auth);
	u32 tmp[2];

	if (!authsize)
		goto decrypt;

	/* Move high-order bits of sequence number back. */
	scatterwalk_map_and_copy(tmp, dst, 4, 4, 0);
	scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 0);
	scatterwalk_map_and_copy(tmp, dst, 0, 8, 1);

	if (crypto_memneq(ihash, ohash, authsize))
		return -EBADMSG;

decrypt:

	sg_init_table(areq_ctx->dst, 2);
	dst = scatterwalk_ffwd(areq_ctx->dst, dst, assoclen);

	skcipher_request_set_tfm(skreq, ctx->enc);
	skcipher_request_set_callback(skreq, flags,
				      req->base.complete, req->base.data);
	skcipher_request_set_crypt(skreq, dst, dst, cryptlen, req->iv);

	return crypto_skcipher_decrypt(skreq);
}

static void authenc_esn_verify_ahash_done(void *data, int err)
{
	struct aead_request *req = data;

	err = err ?: crypto_authenc_esn_decrypt_tail(req, 0);
	authenc_esn_request_complete(req, err);
}

static int crypto_authenc_esn_decrypt(struct aead_request *req)
{
	struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
	struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
	struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
	struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
	unsigned int authsize = crypto_aead_authsize(authenc_esn);
	struct crypto_ahash *auth = ctx->auth;
	u8 *ohash = PTR_ALIGN((u8 *)areq_ctx->tail,
			      crypto_ahash_alignmask(auth) + 1);
	unsigned int assoclen = req->assoclen;
	unsigned int cryptlen = req->cryptlen;
	u8 *ihash = ohash + crypto_ahash_digestsize(auth);
	struct scatterlist *dst = req->dst;
	u32 tmp[2];
	int err;

	cryptlen -= authsize;

	if (req->src != dst) {
		err = crypto_authenc_esn_copy(req, assoclen + cryptlen);
		if (err)
			return err;
	}

	scatterwalk_map_and_copy(ihash, req->src, assoclen + cryptlen,
				 authsize, 0);

	if (!authsize)
		goto tail;

	/* Move high-order bits of sequence number to the end. */
	scatterwalk_map_and_copy(tmp, dst, 0, 8, 0);
	scatterwalk_map_and_copy(tmp, dst, 4, 4, 1);
	scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 1);

	sg_init_table(areq_ctx->dst, 2);
	dst = scatterwalk_ffwd(areq_ctx->dst, dst, 4);

	ahash_request_set_tfm(ahreq, auth);
	ahash_request_set_crypt(ahreq, dst, ohash, assoclen + cryptlen);
	ahash_request_set_callback(ahreq, aead_request_flags(req),
				   authenc_esn_verify_ahash_done, req);

	err = crypto_ahash_digest(ahreq);
	if (err)
		return err;

tail:
	return crypto_authenc_esn_decrypt_tail(req, aead_request_flags(req));
}

static int crypto_authenc_esn_init_tfm(struct crypto_aead *tfm)
{
	struct aead_instance *inst = aead_alg_instance(tfm);
	struct authenc_esn_instance_ctx *ictx = aead_instance_ctx(inst);
	struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(tfm);
	struct crypto_ahash *auth;
	struct crypto_skcipher *enc;
	struct crypto_sync_skcipher *null;
	int err;

	auth = crypto_spawn_ahash(&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_ahash;

	null = crypto_get_default_null_skcipher();
	err = PTR_ERR(null);
	if (IS_ERR(null))
		goto err_free_skcipher;

	ctx->auth = auth;
	ctx->enc = enc;
	ctx->null = null;

	ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth),
			    crypto_ahash_alignmask(auth) + 1);

	crypto_aead_set_reqsize(
		tfm,
		sizeof(struct authenc_esn_request_ctx) +
		ctx->reqoff +
		max_t(unsigned int,
		      crypto_ahash_reqsize(auth) +
		      sizeof(struct ahash_request),
		      sizeof(struct skcipher_request) +
		      crypto_skcipher_reqsize(enc)));

	return 0;

err_free_skcipher:
	crypto_free_skcipher(enc);
err_free_ahash:
	crypto_free_ahash(auth);
	return err;
}

static void crypto_authenc_esn_exit_tfm(struct crypto_aead *tfm)
{
	struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(tfm);

	crypto_free_ahash(ctx->auth);
	crypto_free_skcipher(ctx->enc);
	crypto_put_default_null_skcipher();
}

static void crypto_authenc_esn_free(struct aead_instance *inst)
{
	struct authenc_esn_instance_ctx *ctx = aead_instance_ctx(inst);

	crypto_drop_skcipher(&ctx->enc);
	crypto_drop_ahash(&ctx->auth);
	kfree(inst);
}

static int crypto_authenc_esn_create(struct crypto_template *tmpl,
				     struct rtattr **tb)
{
	u32 mask;
	struct aead_instance *inst;
	struct authenc_esn_instance_ctx *ctx;
	struct hash_alg_common *auth;
	struct crypto_alg *auth_base;
	struct skcipher_alg *enc;
	int err;

	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
	if (err)
		return err;

	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
	if (!inst)
		return -ENOMEM;
	ctx = aead_instance_ctx(inst);

	err = crypto_grab_ahash(&ctx->auth, aead_crypto_instance(inst),
				crypto_attr_alg_name(tb[1]), 0, mask);
	if (err)
		goto err_free_inst;
	auth = crypto_spawn_ahash_alg(&ctx->auth);
	auth_base = &auth->base;

	err = crypto_grab_skcipher(&ctx->enc, aead_crypto_instance(inst),
				   crypto_attr_alg_name(tb[2]), 0, mask);
	if (err)
		goto err_free_inst;
	enc = crypto_spawn_skcipher_alg(&ctx->enc);

	err = -ENAMETOOLONG;
	if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
		     "authencesn(%s,%s)", auth_base->cra_name,
		     enc->base.cra_name) >= CRYPTO_MAX_ALG_NAME)
		goto err_free_inst;

	if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
		     "authencesn(%s,%s)", auth_base->cra_driver_name,
		     enc->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
		goto err_free_inst;

	inst->alg.base.cra_priority = enc->base.cra_priority * 10 +
				      auth_base->cra_priority;
	inst->alg.base.cra_blocksize = enc->base.cra_blocksize;
	inst->alg.base.cra_alignmask = auth_base->cra_alignmask |
				       enc->base.cra_alignmask;
	inst->alg.base.cra_ctxsize = sizeof(struct crypto_authenc_esn_ctx);

	inst->alg.ivsize = crypto_skcipher_alg_ivsize(enc);
	inst->alg.chunksize = crypto_skcipher_alg_chunksize(enc);
	inst->alg.maxauthsize = auth->digestsize;

	inst->alg.init = crypto_authenc_esn_init_tfm;
	inst->alg.exit = crypto_authenc_esn_exit_tfm;

	inst->alg.setkey = crypto_authenc_esn_setkey;
	inst->alg.setauthsize = crypto_authenc_esn_setauthsize;
	inst->alg.encrypt = crypto_authenc_esn_encrypt;
	inst->alg.decrypt = crypto_authenc_esn_decrypt;

	inst->free = crypto_authenc_esn_free;

	err = aead_register_instance(tmpl, inst);
	if (err) {
err_free_inst:
		crypto_authenc_esn_free(inst);
	}
	return err;
}

static struct crypto_template crypto_authenc_esn_tmpl = {
	.name = "authencesn",
	.create = crypto_authenc_esn_create,
	.module = THIS_MODULE,
};

static int __init crypto_authenc_esn_module_init(void)
{
	return crypto_register_template(&crypto_authenc_esn_tmpl);
}

static void __exit crypto_authenc_esn_module_exit(void)
{
	crypto_unregister_template(&crypto_authenc_esn_tmpl);
}

subsys_initcall(crypto_authenc_esn_module_init);
module_exit(crypto_authenc_esn_module_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
MODULE_DESCRIPTION("AEAD wrapper for IPsec with extended sequence numbers");
MODULE_ALIAS_CRYPTO("authencesn");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
a5079d08 SK	2	/*
	3	* authencesn.c - AEAD wrapper for IPsec with extended sequence numbers,
	4	* derived from authenc.c
	5	*
	6	* Copyright (C) 2010 secunet Security Networks AG
	7	* Copyright (C) 2010 Steffen Klassert <steffen.klassert@secunet.com>
104880a6	8	* Copyright (c) 2015 Herbert Xu <herbert@gondor.apana.org.au>
a5079d08 SK	9	*/
a5079d08 SK	10
7fb2a4bd	11	#include <crypto/internal/aead.h>
a5079d08 SK	12	#include <crypto/internal/hash.h>
	13	#include <crypto/internal/skcipher.h>
	14	#include <crypto/authenc.h>
104880a6	15	#include <crypto/null.h>
a5079d08 SK	16	#include <crypto/scatterwalk.h>
	17	#include <linux/err.h>
	18	#include <linux/init.h>
	19	#include <linux/kernel.h>
	20	#include <linux/module.h>
	21	#include <linux/rtnetlink.h>
	22	#include <linux/slab.h>
	23	#include <linux/spinlock.h>
	24
	25	struct authenc_esn_instance_ctx {
	26	struct crypto_ahash_spawn auth;
	27	struct crypto_skcipher_spawn enc;
	28	};
	29
	30	struct crypto_authenc_esn_ctx {
	31	unsigned int reqoff;
	32	struct crypto_ahash *auth;
e75445a8	33	struct crypto_skcipher *enc;
8d605398	34	struct crypto_sync_skcipher *null;
a5079d08 SK	35	};
	36
	37	struct authenc_esn_request_ctx {
104880a6 HX	38	struct scatterlist src[2];
104880a6 HX	39	struct scatterlist dst[2];
a5079d08 SK	40	char tail[];
	41	};
	42
	43	static void authenc_esn_request_complete(struct aead_request *req, int err)
	44	{
	45	if (err != -EINPROGRESS)
	46	aead_request_complete(req, err);
	47	}
	48
104880a6 HX	49	static int crypto_authenc_esn_setauthsize(struct crypto_aead *authenc_esn,
	50	unsigned int authsize)
	51	{
	52	if (authsize > 0 && authsize < 4)
	53	return -EINVAL;
	54
	55	return 0;
	56	}
	57
a5079d08 SK	58	static int crypto_authenc_esn_setkey(struct crypto_aead authenc_esn, const u8 key,
	59	unsigned int keylen)
	60	{
a5079d08 SK	61	struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
a5079d08 SK	62	struct crypto_ahash *auth = ctx->auth;
e75445a8	63	struct crypto_skcipher *enc = ctx->enc;
fddc2c43	64	struct crypto_authenc_keys keys;
a5079d08 SK	65	int err = -EINVAL;
a5079d08 SK	66
fddc2c43	67	if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
674f368a	68	goto out;
a5079d08 SK	69
	70	crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
	71	crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc_esn) &
	72	CRYPTO_TFM_REQ_MASK);
fddc2c43	73	err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen);
a5079d08 SK	74	if (err)
	75	goto out;
	76
e75445a8 HX	77	crypto_skcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
e75445a8 HX	78	crypto_skcipher_set_flags(enc, crypto_aead_get_flags(authenc_esn) &
a5079d08	79	CRYPTO_TFM_REQ_MASK);
e75445a8	80	err = crypto_skcipher_setkey(enc, keys.enckey, keys.enckeylen);
a5079d08	81	out:
31545df3	82	memzero_explicit(&keys, sizeof(keys));
a5079d08	83	return err;
a5079d08 SK	84	}
a5079d08 SK	85
104880a6 HX	86	static int crypto_authenc_esn_genicv_tail(struct aead_request *req,
104880a6 HX	87	unsigned int flags)
a5079d08	88	{
a5079d08 SK	89	struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
	90	struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
	91	struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
104880a6 HX	92	struct crypto_ahash *auth = ctx->auth;
	93	u8 hash = PTR_ALIGN((u8 )areq_ctx->tail,
	94	crypto_ahash_alignmask(auth) + 1);
	95	unsigned int authsize = crypto_aead_authsize(authenc_esn);
	96	unsigned int assoclen = req->assoclen;
	97	unsigned int cryptlen = req->cryptlen;
	98	struct scatterlist *dst = req->dst;
	99	u32 tmp[2];
a5079d08	100
104880a6 HX	101	/* Move high-order bits of sequence number back. */
	102	scatterwalk_map_and_copy(tmp, dst, 4, 4, 0);
	103	scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 0);
	104	scatterwalk_map_and_copy(tmp, dst, 0, 8, 1);
a5079d08	105
104880a6 HX	106	scatterwalk_map_and_copy(hash, dst, assoclen + cryptlen, authsize, 1);
104880a6 HX	107	return 0;
a5079d08 SK	108	}
a5079d08 SK	109
255e48eb	110	static void authenc_esn_geniv_ahash_done(void *data, int err)
a5079d08	111	{
255e48eb	112	struct aead_request *req = data;
a5079d08	113
104880a6	114	err = err ?: crypto_authenc_esn_genicv_tail(req, 0);
a5079d08 SK	115	aead_request_complete(req, err);
	116	}
	117
104880a6 HX	118	static int crypto_authenc_esn_genicv(struct aead_request *req,
104880a6 HX	119	unsigned int flags)
a5079d08	120	{
a5079d08	121	struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
a5079d08	122	struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
a5079d08	123	struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
104880a6 HX	124	struct crypto_ahash *auth = ctx->auth;
	125	u8 hash = PTR_ALIGN((u8 )areq_ctx->tail,
	126	crypto_ahash_alignmask(auth) + 1);
a5079d08	127	struct ahash_request ahreq = (void )(areq_ctx->tail + ctx->reqoff);
104880a6 HX	128	unsigned int authsize = crypto_aead_authsize(authenc_esn);
104880a6 HX	129	unsigned int assoclen = req->assoclen;
a5079d08	130	unsigned int cryptlen = req->cryptlen;
104880a6 HX	131	struct scatterlist *dst = req->dst;
104880a6 HX	132	u32 tmp[2];
a5079d08	133
104880a6 HX	134	if (!authsize)
104880a6 HX	135	return 0;
a5079d08	136
104880a6 HX	137	/* Move high-order bits of sequence number to the end. */
	138	scatterwalk_map_and_copy(tmp, dst, 0, 8, 0);
	139	scatterwalk_map_and_copy(tmp, dst, 4, 4, 1);
	140	scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 1);
a5079d08	141
104880a6 HX	142	sg_init_table(areq_ctx->dst, 2);
104880a6 HX	143	dst = scatterwalk_ffwd(areq_ctx->dst, dst, 4);
a5079d08	144
104880a6 HX	145	ahash_request_set_tfm(ahreq, auth);
	146	ahash_request_set_crypt(ahreq, dst, hash, assoclen + cryptlen);
	147	ahash_request_set_callback(ahreq, flags,
	148	authenc_esn_geniv_ahash_done, req);
a5079d08	149
104880a6 HX	150	return crypto_ahash_digest(ahreq) ?:
104880a6 HX	151	crypto_authenc_esn_genicv_tail(req, aead_request_flags(req));
a5079d08 SK	152	}
	153
	154
255e48eb	155	static void crypto_authenc_esn_encrypt_done(void *data, int err)
a5079d08	156	{
255e48eb	157	struct aead_request *areq = data;
a5079d08	158
104880a6 HX	159	if (!err)
104880a6 HX	160	err = crypto_authenc_esn_genicv(areq, 0);
a5079d08	161
104880a6	162	authenc_esn_request_complete(areq, err);
a5079d08 SK	163	}
a5079d08 SK	164
104880a6	165	static int crypto_authenc_esn_copy(struct aead_request *req, unsigned int len)
a5079d08 SK	166	{
	167	struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
	168	struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
8d605398	169	SYNC_SKCIPHER_REQUEST_ON_STACK(skreq, ctx->null);
a5079d08	170
8d605398	171	skcipher_request_set_sync_tfm(skreq, ctx->null);
e75445a8 HX	172	skcipher_request_set_callback(skreq, aead_request_flags(req),
	173	NULL, NULL);
	174	skcipher_request_set_crypt(skreq, req->src, req->dst, len, NULL);
	175
	176	return crypto_skcipher_encrypt(skreq);
a5079d08 SK	177	}
a5079d08 SK	178
104880a6	179	static int crypto_authenc_esn_encrypt(struct aead_request *req)
a5079d08 SK	180	{
	181	struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
	182	struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
104880a6	183	struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
e75445a8 HX	184	struct skcipher_request skreq = (void )(areq_ctx->tail +
	185	ctx->reqoff);
	186	struct crypto_skcipher *enc = ctx->enc;
104880a6	187	unsigned int assoclen = req->assoclen;
a5079d08	188	unsigned int cryptlen = req->cryptlen;
104880a6 HX	189	struct scatterlist src, dst;
104880a6 HX	190	int err;
a5079d08	191
104880a6 HX	192	sg_init_table(areq_ctx->src, 2);
	193	src = scatterwalk_ffwd(areq_ctx->src, req->src, assoclen);
	194	dst = src;
a5079d08	195
104880a6 HX	196	if (req->src != req->dst) {
	197	err = crypto_authenc_esn_copy(req, assoclen);
	198	if (err)
	199	return err;
a5079d08	200
104880a6 HX	201	sg_init_table(areq_ctx->dst, 2);
104880a6 HX	202	dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, assoclen);
a5079d08 SK	203	}
a5079d08 SK	204
e75445a8 HX	205	skcipher_request_set_tfm(skreq, enc);
	206	skcipher_request_set_callback(skreq, aead_request_flags(req),
	207	crypto_authenc_esn_encrypt_done, req);
	208	skcipher_request_set_crypt(skreq, src, dst, cryptlen, req->iv);
a5079d08	209
e75445a8	210	err = crypto_skcipher_encrypt(skreq);
a5079d08 SK	211	if (err)
	212	return err;
	213
104880a6	214	return crypto_authenc_esn_genicv(req, aead_request_flags(req));
a5079d08 SK	215	}
a5079d08 SK	216
104880a6 HX	217	static int crypto_authenc_esn_decrypt_tail(struct aead_request *req,
104880a6 HX	218	unsigned int flags)
a5079d08	219	{
104880a6 HX	220	struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
	221	unsigned int authsize = crypto_aead_authsize(authenc_esn);
	222	struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
	223	struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
e75445a8 HX	224	struct skcipher_request skreq = (void )(areq_ctx->tail +
e75445a8 HX	225	ctx->reqoff);
104880a6 HX	226	struct crypto_ahash *auth = ctx->auth;
	227	u8 ohash = PTR_ALIGN((u8 )areq_ctx->tail,
	228	crypto_ahash_alignmask(auth) + 1);
	229	unsigned int cryptlen = req->cryptlen - authsize;
	230	unsigned int assoclen = req->assoclen;
	231	struct scatterlist *dst = req->dst;
	232	u8 *ihash = ohash + crypto_ahash_digestsize(auth);
	233	u32 tmp[2];
a5079d08	234
41cdf7a4 HX	235	if (!authsize)
	236	goto decrypt;
	237
104880a6 HX	238	/* Move high-order bits of sequence number back. */
	239	scatterwalk_map_and_copy(tmp, dst, 4, 4, 0);
	240	scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 0);
	241	scatterwalk_map_and_copy(tmp, dst, 0, 8, 1);
a5079d08	242
104880a6 HX	243	if (crypto_memneq(ihash, ohash, authsize))
104880a6 HX	244	return -EBADMSG;
a5079d08	245
41cdf7a4 HX	246	decrypt:
41cdf7a4 HX	247
104880a6 HX	248	sg_init_table(areq_ctx->dst, 2);
104880a6 HX	249	dst = scatterwalk_ffwd(areq_ctx->dst, dst, assoclen);
a5079d08	250
e75445a8 HX	251	skcipher_request_set_tfm(skreq, ctx->enc);
	252	skcipher_request_set_callback(skreq, flags,
	253	req->base.complete, req->base.data);
	254	skcipher_request_set_crypt(skreq, dst, dst, cryptlen, req->iv);
a5079d08	255
e75445a8	256	return crypto_skcipher_decrypt(skreq);
a5079d08 SK	257	}
a5079d08 SK	258
255e48eb	259	static void authenc_esn_verify_ahash_done(void *data, int err)
a5079d08	260	{
255e48eb	261	struct aead_request *req = data;
a5079d08	262
104880a6	263	err = err ?: crypto_authenc_esn_decrypt_tail(req, 0);
a7773363	264	authenc_esn_request_complete(req, err);
a5079d08 SK	265	}
a5079d08 SK	266
104880a6	267	static int crypto_authenc_esn_decrypt(struct aead_request *req)
a5079d08 SK	268	{
	269	struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
	270	struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
104880a6 HX	271	struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
	272	struct ahash_request ahreq = (void )(areq_ctx->tail + ctx->reqoff);
	273	unsigned int authsize = crypto_aead_authsize(authenc_esn);
	274	struct crypto_ahash *auth = ctx->auth;
	275	u8 ohash = PTR_ALIGN((u8 )areq_ctx->tail,
	276	crypto_ahash_alignmask(auth) + 1);
	277	unsigned int assoclen = req->assoclen;
	278	unsigned int cryptlen = req->cryptlen;
	279	u8 *ihash = ohash + crypto_ahash_digestsize(auth);
	280	struct scatterlist *dst = req->dst;
	281	u32 tmp[2];
	282	int err;
a5079d08	283
104880a6	284	cryptlen -= authsize;
a5079d08	285
104880a6 HX	286	if (req->src != dst) {
	287	err = crypto_authenc_esn_copy(req, assoclen + cryptlen);
	288	if (err)
	289	return err;
	290	}
a5079d08	291
104880a6 HX	292	scatterwalk_map_and_copy(ihash, req->src, assoclen + cryptlen,
104880a6 HX	293	authsize, 0);
a5079d08	294
104880a6 HX	295	if (!authsize)
104880a6 HX	296	goto tail;
a5079d08	297
104880a6 HX	298	/* Move high-order bits of sequence number to the end. */
	299	scatterwalk_map_and_copy(tmp, dst, 0, 8, 0);
	300	scatterwalk_map_and_copy(tmp, dst, 4, 4, 1);
	301	scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 1);
a5079d08	302
104880a6 HX	303	sg_init_table(areq_ctx->dst, 2);
104880a6 HX	304	dst = scatterwalk_ffwd(areq_ctx->dst, dst, 4);
a5079d08	305
104880a6 HX	306	ahash_request_set_tfm(ahreq, auth);
	307	ahash_request_set_crypt(ahreq, dst, ohash, assoclen + cryptlen);
	308	ahash_request_set_callback(ahreq, aead_request_flags(req),
	309	authenc_esn_verify_ahash_done, req);
a5079d08	310
104880a6	311	err = crypto_ahash_digest(ahreq);
a5079d08 SK	312	if (err)
	313	return err;
	314
104880a6 HX	315	tail:
104880a6 HX	316	return crypto_authenc_esn_decrypt_tail(req, aead_request_flags(req));
a5079d08 SK	317	}
a5079d08 SK	318
104880a6	319	static int crypto_authenc_esn_init_tfm(struct crypto_aead *tfm)
a5079d08	320	{
104880a6 HX	321	struct aead_instance *inst = aead_alg_instance(tfm);
	322	struct authenc_esn_instance_ctx *ictx = aead_instance_ctx(inst);
	323	struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(tfm);
a5079d08	324	struct crypto_ahash *auth;
e75445a8	325	struct crypto_skcipher *enc;
8d605398	326	struct crypto_sync_skcipher *null;
a5079d08 SK	327	int err;
	328
	329	auth = crypto_spawn_ahash(&ictx->auth);
	330	if (IS_ERR(auth))
	331	return PTR_ERR(auth);
	332
60425a8b	333	enc = crypto_spawn_skcipher(&ictx->enc);
a5079d08 SK	334	err = PTR_ERR(enc);
	335	if (IS_ERR(enc))
	336	goto err_free_ahash;
	337
3a2d4fb5	338	null = crypto_get_default_null_skcipher();
104880a6 HX	339	err = PTR_ERR(null);
	340	if (IS_ERR(null))
	341	goto err_free_skcipher;
	342
a5079d08 SK	343	ctx->auth = auth;
a5079d08 SK	344	ctx->enc = enc;
104880a6	345	ctx->null = null;
a5079d08	346
104880a6 HX	347	ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth),
104880a6 HX	348	crypto_ahash_alignmask(auth) + 1);
a5079d08	349
104880a6 HX	350	crypto_aead_set_reqsize(
104880a6 HX	351	tfm,
6650d09b HX	352	sizeof(struct authenc_esn_request_ctx) +
	353	ctx->reqoff +
	354	max_t(unsigned int,
e75445a8 HX	355	crypto_ahash_reqsize(auth) +
	356	sizeof(struct ahash_request),
	357	sizeof(struct skcipher_request) +
	358	crypto_skcipher_reqsize(enc)));
a5079d08 SK	359
	360	return 0;
	361
104880a6	362	err_free_skcipher:
e75445a8	363	crypto_free_skcipher(enc);
a5079d08 SK	364	err_free_ahash:
	365	crypto_free_ahash(auth);
	366	return err;
	367	}
	368
104880a6	369	static void crypto_authenc_esn_exit_tfm(struct crypto_aead *tfm)
a5079d08	370	{
104880a6	371	struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(tfm);
a5079d08 SK	372
a5079d08 SK	373	crypto_free_ahash(ctx->auth);
e75445a8	374	crypto_free_skcipher(ctx->enc);
3a2d4fb5	375	crypto_put_default_null_skcipher();
104880a6 HX	376	}
	377
	378	static void crypto_authenc_esn_free(struct aead_instance *inst)
	379	{
	380	struct authenc_esn_instance_ctx *ctx = aead_instance_ctx(inst);
	381
	382	crypto_drop_skcipher(&ctx->enc);
	383	crypto_drop_ahash(&ctx->auth);
	384	kfree(inst);
a5079d08 SK	385	}
a5079d08 SK	386
104880a6 HX	387	static int crypto_authenc_esn_create(struct crypto_template *tmpl,
104880a6 HX	388	struct rtattr **tb)
a5079d08	389	{
b9f76ddd	390	u32 mask;
104880a6	391	struct aead_instance *inst;
37073882	392	struct authenc_esn_instance_ctx *ctx;
a5079d08 SK	393	struct hash_alg_common *auth;
a5079d08 SK	394	struct crypto_alg *auth_base;
e75445a8	395	struct skcipher_alg *enc;
a5079d08 SK	396	int err;
a5079d08 SK	397
7bcb2c99 EB	398	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
	399	if (err)
	400	return err;
b9f76ddd	401
a5079d08	402	inst = kzalloc(sizeof(inst) + sizeof(ctx), GFP_KERNEL);
a5079d08	403	if (!inst)
37073882	404	return -ENOMEM;
104880a6	405	ctx = aead_instance_ctx(inst);
a5079d08	406
37073882 EB	407	err = crypto_grab_ahash(&ctx->auth, aead_crypto_instance(inst),
37073882 EB	408	crypto_attr_alg_name(tb[1]), 0, mask);
a5079d08 SK	409	if (err)
a5079d08 SK	410	goto err_free_inst;
37073882 EB	411	auth = crypto_spawn_ahash_alg(&ctx->auth);
37073882 EB	412	auth_base = &auth->base;
a5079d08	413
b9f76ddd	414	err = crypto_grab_skcipher(&ctx->enc, aead_crypto_instance(inst),
37073882	415	crypto_attr_alg_name(tb[2]), 0, mask);
a5079d08	416	if (err)
37073882	417	goto err_free_inst;
e75445a8	418	enc = crypto_spawn_skcipher_alg(&ctx->enc);
a5079d08 SK	419
a5079d08 SK	420	err = -ENAMETOOLONG;
104880a6 HX	421	if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
104880a6 HX	422	"authencesn(%s,%s)", auth_base->cra_name,
e75445a8	423	enc->base.cra_name) >= CRYPTO_MAX_ALG_NAME)
37073882	424	goto err_free_inst;
a5079d08	425
104880a6	426	if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
a5079d08	427	"authencesn(%s,%s)", auth_base->cra_driver_name,
e75445a8	428	enc->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
37073882	429	goto err_free_inst;
a5079d08	430
e75445a8	431	inst->alg.base.cra_priority = enc->base.cra_priority * 10 +
104880a6	432	auth_base->cra_priority;
e75445a8	433	inst->alg.base.cra_blocksize = enc->base.cra_blocksize;
104880a6	434	inst->alg.base.cra_alignmask = auth_base->cra_alignmask \|
e75445a8	435	enc->base.cra_alignmask;
104880a6 HX	436	inst->alg.base.cra_ctxsize = sizeof(struct crypto_authenc_esn_ctx);
104880a6 HX	437
e75445a8 HX	438	inst->alg.ivsize = crypto_skcipher_alg_ivsize(enc);
e75445a8 HX	439	inst->alg.chunksize = crypto_skcipher_alg_chunksize(enc);
104880a6	440	inst->alg.maxauthsize = auth->digestsize;
a5079d08	441
104880a6 HX	442	inst->alg.init = crypto_authenc_esn_init_tfm;
104880a6 HX	443	inst->alg.exit = crypto_authenc_esn_exit_tfm;
a5079d08	444
104880a6 HX	445	inst->alg.setkey = crypto_authenc_esn_setkey;
	446	inst->alg.setauthsize = crypto_authenc_esn_setauthsize;
	447	inst->alg.encrypt = crypto_authenc_esn_encrypt;
	448	inst->alg.decrypt = crypto_authenc_esn_decrypt;
a5079d08	449
d1dc4df1	450	inst->free = crypto_authenc_esn_free;
a5079d08	451
104880a6	452	err = aead_register_instance(tmpl, inst);
37073882	453	if (err) {
a5079d08	454	err_free_inst:
37073882 EB	455	crypto_authenc_esn_free(inst);
	456	}
	457	return err;
a5079d08 SK	458	}
a5079d08 SK	459
a5079d08 SK	460	static struct crypto_template crypto_authenc_esn_tmpl = {
a5079d08 SK	461	.name = "authencesn",
104880a6	462	.create = crypto_authenc_esn_create,
a5079d08 SK	463	.module = THIS_MODULE,
	464	};
	465
	466	static int __init crypto_authenc_esn_module_init(void)
	467	{
	468	return crypto_register_template(&crypto_authenc_esn_tmpl);
	469	}
	470
	471	static void __exit crypto_authenc_esn_module_exit(void)
	472	{
	473	crypto_unregister_template(&crypto_authenc_esn_tmpl);
	474	}
	475
c4741b23	476	subsys_initcall(crypto_authenc_esn_module_init);
a5079d08 SK	477	module_exit(crypto_authenc_esn_module_exit);
	478
	479	MODULE_LICENSE("GPL");
	480	MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
	481	MODULE_DESCRIPTION("AEAD wrapper for IPsec with extended sequence numbers");
4943ba16	482	MODULE_ALIAS_CRYPTO("authencesn");