[mirror_ubuntu-bionic-kernel.git] / crypto / authencesn.c

/*
 * 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>
 *
 * 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/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_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 badkey;

	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);
	crypto_aead_set_flags(authenc_esn, crypto_ahash_get_flags(auth) &
					   CRYPTO_TFM_RES_MASK);

	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);
	crypto_aead_set_flags(authenc_esn, crypto_skcipher_get_flags(enc) &
					   CRYPTO_TFM_RES_MASK);

out:
	memzero_explicit(&keys, sizeof(keys));
	return err;

badkey:
	crypto_aead_set_flags(authenc_esn, CRYPTO_TFM_RES_BAD_KEY_LEN);
	goto out;
}

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(struct crypto_async_request *areq,
					 int err)
{
	struct aead_request *req = areq->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(struct crypto_async_request *req,
					    int err)
{
	struct aead_request *areq = req->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);
	SKCIPHER_REQUEST_ON_STACK(skreq, ctx->null);

	skcipher_request_set_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(struct crypto_async_request *areq,
					  int err)
{
	struct aead_request *req = areq->data;

	err = err ?: crypto_authenc_esn_decrypt_tail(req, 0);
	aead_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_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_skcipher2();
	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_skcipher2();
}

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)
{
	struct crypto_attr_type *algt;
	struct aead_instance *inst;
	struct hash_alg_common *auth;
	struct crypto_alg *auth_base;
	struct skcipher_alg *enc;
	struct authenc_esn_instance_ctx *ctx;
	const char *enc_name;
	int err;

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

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

	auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
			      CRYPTO_ALG_TYPE_AHASH_MASK |
			      crypto_requires_sync(algt->type, algt->mask));
	if (IS_ERR(auth))
		return PTR_ERR(auth);

	auth_base = &auth->base;

	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 = aead_instance_ctx(inst);

	err = crypto_init_ahash_spawn(&ctx->auth, auth,
				      aead_crypto_instance(inst));
	if (err)
		goto err_free_inst;

	crypto_set_skcipher_spawn(&ctx->enc, aead_crypto_instance(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_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_drop_enc;

	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_drop_enc;

	inst->alg.base.cra_flags = (auth_base->cra_flags |
				    enc->base.cra_flags) & CRYPTO_ALG_ASYNC;
	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)
		goto err_drop_enc;

out:
	crypto_mod_put(auth_base);
	return err;

err_drop_enc:
	crypto_drop_skcipher(&ctx->enc);
err_drop_auth:
	crypto_drop_ahash(&ctx->auth);
err_free_inst:
	kfree(inst);
out_put_auth:
	goto out;
}

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);
}

module_init(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
a5079d08 SK	1	/*
	2	* authencesn.c - AEAD wrapper for IPsec with extended sequence numbers,
	3	* derived from authenc.c
	4	*
	5	* Copyright (C) 2010 secunet Security Networks AG
	6	* Copyright (C) 2010 Steffen Klassert <steffen.klassert@secunet.com>
104880a6	7	* Copyright (c) 2015 Herbert Xu <herbert@gondor.apana.org.au>
a5079d08 SK	8	*
	9	* This program is free software; you can redistribute it and/or modify it
	10	* under the terms of the GNU General Public License as published by the Free
	11	* Software Foundation; either version 2 of the License, or (at your option)
	12	* any later version.
	13	*
	14	*/
	15
7fb2a4bd	16	#include <crypto/internal/aead.h>
a5079d08 SK	17	#include <crypto/internal/hash.h>
	18	#include <crypto/internal/skcipher.h>
	19	#include <crypto/authenc.h>
104880a6	20	#include <crypto/null.h>
a5079d08 SK	21	#include <crypto/scatterwalk.h>
	22	#include <linux/err.h>
	23	#include <linux/init.h>
	24	#include <linux/kernel.h>
	25	#include <linux/module.h>
	26	#include <linux/rtnetlink.h>
	27	#include <linux/slab.h>
	28	#include <linux/spinlock.h>
	29
	30	struct authenc_esn_instance_ctx {
	31	struct crypto_ahash_spawn auth;
	32	struct crypto_skcipher_spawn enc;
	33	};
	34
	35	struct crypto_authenc_esn_ctx {
	36	unsigned int reqoff;
	37	struct crypto_ahash *auth;
e75445a8 HX	38	struct crypto_skcipher *enc;
e75445a8 HX	39	struct crypto_skcipher *null;
a5079d08 SK	40	};
	41
	42	struct authenc_esn_request_ctx {
104880a6 HX	43	struct scatterlist src[2];
104880a6 HX	44	struct scatterlist dst[2];
a5079d08 SK	45	char tail[];
	46	};
	47
	48	static void authenc_esn_request_complete(struct aead_request *req, int err)
	49	{
	50	if (err != -EINPROGRESS)
	51	aead_request_complete(req, err);
	52	}
	53
104880a6 HX	54	static int crypto_authenc_esn_setauthsize(struct crypto_aead *authenc_esn,
	55	unsigned int authsize)
	56	{
	57	if (authsize > 0 && authsize < 4)
	58	return -EINVAL;
	59
	60	return 0;
	61	}
	62
a5079d08 SK	63	static int crypto_authenc_esn_setkey(struct crypto_aead authenc_esn, const u8 key,
	64	unsigned int keylen)
	65	{
a5079d08 SK	66	struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
a5079d08 SK	67	struct crypto_ahash *auth = ctx->auth;
e75445a8	68	struct crypto_skcipher *enc = ctx->enc;
fddc2c43	69	struct crypto_authenc_keys keys;
a5079d08 SK	70	int err = -EINVAL;
a5079d08 SK	71
fddc2c43	72	if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
a5079d08	73	goto badkey;
a5079d08 SK	74
	75	crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
	76	crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc_esn) &
	77	CRYPTO_TFM_REQ_MASK);
fddc2c43	78	err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen);
a5079d08 SK	79	crypto_aead_set_flags(authenc_esn, crypto_ahash_get_flags(auth) &
	80	CRYPTO_TFM_RES_MASK);
	81
	82	if (err)
	83	goto out;
	84
e75445a8 HX	85	crypto_skcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
e75445a8 HX	86	crypto_skcipher_set_flags(enc, crypto_aead_get_flags(authenc_esn) &
a5079d08	87	CRYPTO_TFM_REQ_MASK);
e75445a8 HX	88	err = crypto_skcipher_setkey(enc, keys.enckey, keys.enckeylen);
e75445a8 HX	89	crypto_aead_set_flags(authenc_esn, crypto_skcipher_get_flags(enc) &
a5079d08 SK	90	CRYPTO_TFM_RES_MASK);
	91
	92	out:
4bfb85b9	93	memzero_explicit(&keys, sizeof(keys));
a5079d08 SK	94	return err;
	95
	96	badkey:
	97	crypto_aead_set_flags(authenc_esn, CRYPTO_TFM_RES_BAD_KEY_LEN);
	98	goto out;
	99	}
	100
104880a6 HX	101	static int crypto_authenc_esn_genicv_tail(struct aead_request *req,
104880a6 HX	102	unsigned int flags)
a5079d08	103	{
a5079d08 SK	104	struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
	105	struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
	106	struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
104880a6 HX	107	struct crypto_ahash *auth = ctx->auth;
	108	u8 hash = PTR_ALIGN((u8 )areq_ctx->tail,
	109	crypto_ahash_alignmask(auth) + 1);
	110	unsigned int authsize = crypto_aead_authsize(authenc_esn);
	111	unsigned int assoclen = req->assoclen;
	112	unsigned int cryptlen = req->cryptlen;
	113	struct scatterlist *dst = req->dst;
	114	u32 tmp[2];
a5079d08	115
104880a6 HX	116	/* Move high-order bits of sequence number back. */
	117	scatterwalk_map_and_copy(tmp, dst, 4, 4, 0);
	118	scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 0);
	119	scatterwalk_map_and_copy(tmp, dst, 0, 8, 1);
a5079d08	120
104880a6 HX	121	scatterwalk_map_and_copy(hash, dst, assoclen + cryptlen, authsize, 1);
104880a6 HX	122	return 0;
a5079d08 SK	123	}
a5079d08 SK	124
a5079d08 SK	125	static void authenc_esn_geniv_ahash_done(struct crypto_async_request *areq,
	126	int err)
	127	{
	128	struct aead_request *req = areq->data;
a5079d08	129
104880a6	130	err = err ?: crypto_authenc_esn_genicv_tail(req, 0);
a5079d08 SK	131	aead_request_complete(req, err);
	132	}
	133
104880a6 HX	134	static int crypto_authenc_esn_genicv(struct aead_request *req,
104880a6 HX	135	unsigned int flags)
a5079d08	136	{
a5079d08	137	struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
a5079d08	138	struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
a5079d08	139	struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
104880a6 HX	140	struct crypto_ahash *auth = ctx->auth;
	141	u8 hash = PTR_ALIGN((u8 )areq_ctx->tail,
	142	crypto_ahash_alignmask(auth) + 1);
a5079d08	143	struct ahash_request ahreq = (void )(areq_ctx->tail + ctx->reqoff);
104880a6 HX	144	unsigned int authsize = crypto_aead_authsize(authenc_esn);
104880a6 HX	145	unsigned int assoclen = req->assoclen;
a5079d08	146	unsigned int cryptlen = req->cryptlen;
104880a6 HX	147	struct scatterlist *dst = req->dst;
104880a6 HX	148	u32 tmp[2];
a5079d08	149
104880a6 HX	150	if (!authsize)
104880a6 HX	151	return 0;
a5079d08	152
104880a6 HX	153	/* Move high-order bits of sequence number to the end. */
	154	scatterwalk_map_and_copy(tmp, dst, 0, 8, 0);
	155	scatterwalk_map_and_copy(tmp, dst, 4, 4, 1);
	156	scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 1);
a5079d08	157
104880a6 HX	158	sg_init_table(areq_ctx->dst, 2);
104880a6 HX	159	dst = scatterwalk_ffwd(areq_ctx->dst, dst, 4);
a5079d08	160
104880a6 HX	161	ahash_request_set_tfm(ahreq, auth);
	162	ahash_request_set_crypt(ahreq, dst, hash, assoclen + cryptlen);
	163	ahash_request_set_callback(ahreq, flags,
	164	authenc_esn_geniv_ahash_done, req);
a5079d08	165
104880a6 HX	166	return crypto_ahash_digest(ahreq) ?:
104880a6 HX	167	crypto_authenc_esn_genicv_tail(req, aead_request_flags(req));
a5079d08 SK	168	}
	169
	170
104880a6 HX	171	static void crypto_authenc_esn_encrypt_done(struct crypto_async_request *req,
104880a6 HX	172	int err)
a5079d08	173	{
104880a6	174	struct aead_request *areq = req->data;
a5079d08	175
104880a6 HX	176	if (!err)
104880a6 HX	177	err = crypto_authenc_esn_genicv(areq, 0);
a5079d08	178
104880a6	179	authenc_esn_request_complete(areq, err);
a5079d08 SK	180	}
a5079d08 SK	181
104880a6	182	static int crypto_authenc_esn_copy(struct aead_request *req, unsigned int len)
a5079d08 SK	183	{
	184	struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
	185	struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
e75445a8	186	SKCIPHER_REQUEST_ON_STACK(skreq, ctx->null);
a5079d08	187
e75445a8 HX	188	skcipher_request_set_tfm(skreq, ctx->null);
	189	skcipher_request_set_callback(skreq, aead_request_flags(req),
	190	NULL, NULL);
	191	skcipher_request_set_crypt(skreq, req->src, req->dst, len, NULL);
	192
	193	return crypto_skcipher_encrypt(skreq);
a5079d08 SK	194	}
a5079d08 SK	195
104880a6	196	static int crypto_authenc_esn_encrypt(struct aead_request *req)
a5079d08 SK	197	{
	198	struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
	199	struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
104880a6	200	struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
e75445a8 HX	201	struct skcipher_request skreq = (void )(areq_ctx->tail +
	202	ctx->reqoff);
	203	struct crypto_skcipher *enc = ctx->enc;
104880a6	204	unsigned int assoclen = req->assoclen;
a5079d08	205	unsigned int cryptlen = req->cryptlen;
104880a6 HX	206	struct scatterlist src, dst;
104880a6 HX	207	int err;
a5079d08	208
104880a6 HX	209	sg_init_table(areq_ctx->src, 2);
	210	src = scatterwalk_ffwd(areq_ctx->src, req->src, assoclen);
	211	dst = src;
a5079d08	212
104880a6 HX	213	if (req->src != req->dst) {
	214	err = crypto_authenc_esn_copy(req, assoclen);
	215	if (err)
	216	return err;
a5079d08	217
104880a6 HX	218	sg_init_table(areq_ctx->dst, 2);
104880a6 HX	219	dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, assoclen);
a5079d08 SK	220	}
a5079d08 SK	221
e75445a8 HX	222	skcipher_request_set_tfm(skreq, enc);
	223	skcipher_request_set_callback(skreq, aead_request_flags(req),
	224	crypto_authenc_esn_encrypt_done, req);
	225	skcipher_request_set_crypt(skreq, src, dst, cryptlen, req->iv);
a5079d08	226
e75445a8	227	err = crypto_skcipher_encrypt(skreq);
a5079d08 SK	228	if (err)
	229	return err;
	230
104880a6	231	return crypto_authenc_esn_genicv(req, aead_request_flags(req));
a5079d08 SK	232	}
a5079d08 SK	233
104880a6 HX	234	static int crypto_authenc_esn_decrypt_tail(struct aead_request *req,
104880a6 HX	235	unsigned int flags)
a5079d08	236	{
104880a6 HX	237	struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
	238	unsigned int authsize = crypto_aead_authsize(authenc_esn);
	239	struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
	240	struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
e75445a8 HX	241	struct skcipher_request skreq = (void )(areq_ctx->tail +
e75445a8 HX	242	ctx->reqoff);
104880a6 HX	243	struct crypto_ahash *auth = ctx->auth;
	244	u8 ohash = PTR_ALIGN((u8 )areq_ctx->tail,
	245	crypto_ahash_alignmask(auth) + 1);
	246	unsigned int cryptlen = req->cryptlen - authsize;
	247	unsigned int assoclen = req->assoclen;
	248	struct scatterlist *dst = req->dst;
	249	u8 *ihash = ohash + crypto_ahash_digestsize(auth);
	250	u32 tmp[2];
a5079d08	251
41cdf7a4 HX	252	if (!authsize)
	253	goto decrypt;
	254
104880a6 HX	255	/* Move high-order bits of sequence number back. */
	256	scatterwalk_map_and_copy(tmp, dst, 4, 4, 0);
	257	scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 0);
	258	scatterwalk_map_and_copy(tmp, dst, 0, 8, 1);
a5079d08	259
104880a6 HX	260	if (crypto_memneq(ihash, ohash, authsize))
104880a6 HX	261	return -EBADMSG;
a5079d08	262
41cdf7a4 HX	263	decrypt:
41cdf7a4 HX	264
104880a6 HX	265	sg_init_table(areq_ctx->dst, 2);
104880a6 HX	266	dst = scatterwalk_ffwd(areq_ctx->dst, dst, assoclen);
a5079d08	267
e75445a8 HX	268	skcipher_request_set_tfm(skreq, ctx->enc);
	269	skcipher_request_set_callback(skreq, flags,
	270	req->base.complete, req->base.data);
	271	skcipher_request_set_crypt(skreq, dst, dst, cryptlen, req->iv);
a5079d08	272
e75445a8	273	return crypto_skcipher_decrypt(skreq);
a5079d08 SK	274	}
a5079d08 SK	275
104880a6 HX	276	static void authenc_esn_verify_ahash_done(struct crypto_async_request *areq,
104880a6 HX	277	int err)
a5079d08	278	{
104880a6	279	struct aead_request *req = areq->data;
a5079d08	280
104880a6 HX	281	err = err ?: crypto_authenc_esn_decrypt_tail(req, 0);
104880a6 HX	282	aead_request_complete(req, err);
a5079d08 SK	283	}
a5079d08 SK	284
104880a6	285	static int crypto_authenc_esn_decrypt(struct aead_request *req)
a5079d08 SK	286	{
	287	struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
	288	struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
104880a6 HX	289	struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
	290	struct ahash_request ahreq = (void )(areq_ctx->tail + ctx->reqoff);
	291	unsigned int authsize = crypto_aead_authsize(authenc_esn);
	292	struct crypto_ahash *auth = ctx->auth;
	293	u8 ohash = PTR_ALIGN((u8 )areq_ctx->tail,
	294	crypto_ahash_alignmask(auth) + 1);
	295	unsigned int assoclen = req->assoclen;
	296	unsigned int cryptlen = req->cryptlen;
	297	u8 *ihash = ohash + crypto_ahash_digestsize(auth);
	298	struct scatterlist *dst = req->dst;
	299	u32 tmp[2];
	300	int err;
a5079d08	301
104880a6	302	cryptlen -= authsize;
a5079d08	303
104880a6 HX	304	if (req->src != dst) {
	305	err = crypto_authenc_esn_copy(req, assoclen + cryptlen);
	306	if (err)
	307	return err;
	308	}
a5079d08	309
104880a6 HX	310	scatterwalk_map_and_copy(ihash, req->src, assoclen + cryptlen,
104880a6 HX	311	authsize, 0);
a5079d08	312
104880a6 HX	313	if (!authsize)
104880a6 HX	314	goto tail;
a5079d08	315
104880a6 HX	316	/* Move high-order bits of sequence number to the end. */
	317	scatterwalk_map_and_copy(tmp, dst, 0, 8, 0);
	318	scatterwalk_map_and_copy(tmp, dst, 4, 4, 1);
	319	scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 1);
a5079d08	320
104880a6 HX	321	sg_init_table(areq_ctx->dst, 2);
104880a6 HX	322	dst = scatterwalk_ffwd(areq_ctx->dst, dst, 4);
a5079d08	323
104880a6 HX	324	ahash_request_set_tfm(ahreq, auth);
	325	ahash_request_set_crypt(ahreq, dst, ohash, assoclen + cryptlen);
	326	ahash_request_set_callback(ahreq, aead_request_flags(req),
	327	authenc_esn_verify_ahash_done, req);
a5079d08	328
104880a6	329	err = crypto_ahash_digest(ahreq);
a5079d08 SK	330	if (err)
	331	return err;
	332
104880a6 HX	333	tail:
104880a6 HX	334	return crypto_authenc_esn_decrypt_tail(req, aead_request_flags(req));
a5079d08 SK	335	}
a5079d08 SK	336
104880a6	337	static int crypto_authenc_esn_init_tfm(struct crypto_aead *tfm)
a5079d08	338	{
104880a6 HX	339	struct aead_instance *inst = aead_alg_instance(tfm);
	340	struct authenc_esn_instance_ctx *ictx = aead_instance_ctx(inst);
	341	struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(tfm);
a5079d08	342	struct crypto_ahash *auth;
e75445a8 HX	343	struct crypto_skcipher *enc;
e75445a8 HX	344	struct crypto_skcipher *null;
a5079d08 SK	345	int err;
	346
	347	auth = crypto_spawn_ahash(&ictx->auth);
	348	if (IS_ERR(auth))
	349	return PTR_ERR(auth);
	350
60425a8b	351	enc = crypto_spawn_skcipher(&ictx->enc);
a5079d08 SK	352	err = PTR_ERR(enc);
	353	if (IS_ERR(enc))
	354	goto err_free_ahash;
	355
e75445a8	356	null = crypto_get_default_null_skcipher2();
104880a6 HX	357	err = PTR_ERR(null);
	358	if (IS_ERR(null))
	359	goto err_free_skcipher;
	360
a5079d08 SK	361	ctx->auth = auth;
a5079d08 SK	362	ctx->enc = enc;
104880a6	363	ctx->null = null;
a5079d08	364
104880a6 HX	365	ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth),
104880a6 HX	366	crypto_ahash_alignmask(auth) + 1);
a5079d08	367
104880a6 HX	368	crypto_aead_set_reqsize(
104880a6 HX	369	tfm,
6650d09b HX	370	sizeof(struct authenc_esn_request_ctx) +
	371	ctx->reqoff +
	372	max_t(unsigned int,
e75445a8 HX	373	crypto_ahash_reqsize(auth) +
	374	sizeof(struct ahash_request),
	375	sizeof(struct skcipher_request) +
	376	crypto_skcipher_reqsize(enc)));
a5079d08 SK	377
	378	return 0;
	379
104880a6	380	err_free_skcipher:
e75445a8	381	crypto_free_skcipher(enc);
a5079d08 SK	382	err_free_ahash:
	383	crypto_free_ahash(auth);
	384	return err;
	385	}
	386
104880a6	387	static void crypto_authenc_esn_exit_tfm(struct crypto_aead *tfm)
a5079d08	388	{
104880a6	389	struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(tfm);
a5079d08 SK	390
a5079d08 SK	391	crypto_free_ahash(ctx->auth);
e75445a8 HX	392	crypto_free_skcipher(ctx->enc);
e75445a8 HX	393	crypto_put_default_null_skcipher2();
104880a6 HX	394	}
	395
	396	static void crypto_authenc_esn_free(struct aead_instance *inst)
	397	{
	398	struct authenc_esn_instance_ctx *ctx = aead_instance_ctx(inst);
	399
	400	crypto_drop_skcipher(&ctx->enc);
	401	crypto_drop_ahash(&ctx->auth);
	402	kfree(inst);
a5079d08 SK	403	}
a5079d08 SK	404
104880a6 HX	405	static int crypto_authenc_esn_create(struct crypto_template *tmpl,
104880a6 HX	406	struct rtattr **tb)
a5079d08 SK	407	{
a5079d08 SK	408	struct crypto_attr_type *algt;
104880a6	409	struct aead_instance *inst;
a5079d08 SK	410	struct hash_alg_common *auth;
a5079d08 SK	411	struct crypto_alg *auth_base;
e75445a8	412	struct skcipher_alg *enc;
a5079d08 SK	413	struct authenc_esn_instance_ctx *ctx;
	414	const char *enc_name;
	415	int err;
	416
	417	algt = crypto_get_attr_type(tb);
a5079d08	418	if (IS_ERR(algt))
104880a6	419	return PTR_ERR(algt);
a5079d08	420
5e4b8c1f	421	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
104880a6	422	return -EINVAL;
a5079d08 SK	423
a5079d08 SK	424	auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
927ef32d HX	425	CRYPTO_ALG_TYPE_AHASH_MASK \|
927ef32d HX	426	crypto_requires_sync(algt->type, algt->mask));
a5079d08	427	if (IS_ERR(auth))
104880a6	428	return PTR_ERR(auth);
a5079d08 SK	429
	430	auth_base = &auth->base;
	431
	432	enc_name = crypto_attr_alg_name(tb[2]);
	433	err = PTR_ERR(enc_name);
	434	if (IS_ERR(enc_name))
	435	goto out_put_auth;
	436
	437	inst = kzalloc(sizeof(inst) + sizeof(ctx), GFP_KERNEL);
	438	err = -ENOMEM;
	439	if (!inst)
	440	goto out_put_auth;
	441
104880a6	442	ctx = aead_instance_ctx(inst);
a5079d08	443
104880a6 HX	444	err = crypto_init_ahash_spawn(&ctx->auth, auth,
104880a6 HX	445	aead_crypto_instance(inst));
a5079d08 SK	446	if (err)
	447	goto err_free_inst;
	448
104880a6	449	crypto_set_skcipher_spawn(&ctx->enc, aead_crypto_instance(inst));
a35528ec EB	450	err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
	451	crypto_requires_sync(algt->type,
	452	algt->mask));
a5079d08 SK	453	if (err)
	454	goto err_drop_auth;
	455
e75445a8	456	enc = crypto_spawn_skcipher_alg(&ctx->enc);
a5079d08 SK	457
a5079d08 SK	458	err = -ENAMETOOLONG;
104880a6 HX	459	if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
104880a6 HX	460	"authencesn(%s,%s)", auth_base->cra_name,
e75445a8	461	enc->base.cra_name) >= CRYPTO_MAX_ALG_NAME)
a5079d08 SK	462	goto err_drop_enc;
a5079d08 SK	463
104880a6	464	if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
a5079d08	465	"authencesn(%s,%s)", auth_base->cra_driver_name,
e75445a8	466	enc->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
a5079d08 SK	467	goto err_drop_enc;
a5079d08 SK	468
e75445a8 HX	469	inst->alg.base.cra_flags = (auth_base->cra_flags \|
	470	enc->base.cra_flags) & CRYPTO_ALG_ASYNC;
	471	inst->alg.base.cra_priority = enc->base.cra_priority * 10 +
104880a6	472	auth_base->cra_priority;
e75445a8	473	inst->alg.base.cra_blocksize = enc->base.cra_blocksize;
104880a6	474	inst->alg.base.cra_alignmask = auth_base->cra_alignmask \|
e75445a8	475	enc->base.cra_alignmask;
104880a6 HX	476	inst->alg.base.cra_ctxsize = sizeof(struct crypto_authenc_esn_ctx);
104880a6 HX	477
e75445a8 HX	478	inst->alg.ivsize = crypto_skcipher_alg_ivsize(enc);
e75445a8 HX	479	inst->alg.chunksize = crypto_skcipher_alg_chunksize(enc);
104880a6	480	inst->alg.maxauthsize = auth->digestsize;
a5079d08	481
104880a6 HX	482	inst->alg.init = crypto_authenc_esn_init_tfm;
104880a6 HX	483	inst->alg.exit = crypto_authenc_esn_exit_tfm;
a5079d08	484
104880a6 HX	485	inst->alg.setkey = crypto_authenc_esn_setkey;
	486	inst->alg.setauthsize = crypto_authenc_esn_setauthsize;
	487	inst->alg.encrypt = crypto_authenc_esn_encrypt;
	488	inst->alg.decrypt = crypto_authenc_esn_decrypt;
a5079d08	489
104880a6	490	inst->free = crypto_authenc_esn_free,
a5079d08	491
104880a6 HX	492	err = aead_register_instance(tmpl, inst);
	493	if (err)
	494	goto err_drop_enc;
a5079d08 SK	495
	496	out:
	497	crypto_mod_put(auth_base);
104880a6	498	return err;
a5079d08 SK	499
	500	err_drop_enc:
	501	crypto_drop_skcipher(&ctx->enc);
	502	err_drop_auth:
	503	crypto_drop_ahash(&ctx->auth);
	504	err_free_inst:
	505	kfree(inst);
	506	out_put_auth:
a5079d08 SK	507	goto out;
	508	}
	509
a5079d08 SK	510	static struct crypto_template crypto_authenc_esn_tmpl = {
a5079d08 SK	511	.name = "authencesn",
104880a6	512	.create = crypto_authenc_esn_create,
a5079d08 SK	513	.module = THIS_MODULE,
	514	};
	515
	516	static int __init crypto_authenc_esn_module_init(void)
	517	{
	518	return crypto_register_template(&crypto_authenc_esn_tmpl);
	519	}
	520
	521	static void __exit crypto_authenc_esn_module_exit(void)
	522	{
	523	crypto_unregister_template(&crypto_authenc_esn_tmpl);
	524	}
	525
	526	module_init(crypto_authenc_esn_module_init);
	527	module_exit(crypto_authenc_esn_module_exit);
	528
	529	MODULE_LICENSE("GPL");
	530	MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
	531	MODULE_DESCRIPTION("AEAD wrapper for IPsec with extended sequence numbers");
4943ba16	532	MODULE_ALIAS_CRYPTO("authencesn");