[mirror_ubuntu-artful-kernel.git] / net / mac80211 / aes_ccm.c

/*
 * Copyright 2003-2004, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 *
 * Rewrite: Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/err.h>
#include <crypto/aead.h>

#include <net/mac80211.h>
#include "key.h"
#include "aes_ccm.h"

int ieee80211_aes_ccm_encrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
			      u8 *data, size_t data_len, u8 *mic,
			      size_t mic_len)
{
	struct scatterlist sg[3];
	struct aead_request *aead_req;
	int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm);
	u8 *__aad;

	aead_req = kzalloc(reqsize + CCM_AAD_LEN, GFP_ATOMIC);
	if (!aead_req)
		return -ENOMEM;

	__aad = (u8 *)aead_req + reqsize;
	memcpy(__aad, aad, CCM_AAD_LEN);

	sg_init_table(sg, 3);
	sg_set_buf(&sg[0], &__aad[2], be16_to_cpup((__be16 *)__aad));
	sg_set_buf(&sg[1], data, data_len);
	sg_set_buf(&sg[2], mic, mic_len);

	aead_request_set_tfm(aead_req, tfm);
	aead_request_set_crypt(aead_req, sg, sg, data_len, b_0);
	aead_request_set_ad(aead_req, sg[0].length);

	crypto_aead_encrypt(aead_req);
	kzfree(aead_req);

	return 0;
}

int ieee80211_aes_ccm_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
			      u8 *data, size_t data_len, u8 *mic,
			      size_t mic_len)
{
	struct scatterlist sg[3];
	struct aead_request *aead_req;
	int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm);
	u8 *__aad;
	int err;

	if (data_len == 0)
		return -EINVAL;

	aead_req = kzalloc(reqsize + CCM_AAD_LEN, GFP_ATOMIC);
	if (!aead_req)
		return -ENOMEM;

	__aad = (u8 *)aead_req + reqsize;
	memcpy(__aad, aad, CCM_AAD_LEN);

	sg_init_table(sg, 3);
	sg_set_buf(&sg[0], &__aad[2], be16_to_cpup((__be16 *)__aad));
	sg_set_buf(&sg[1], data, data_len);
	sg_set_buf(&sg[2], mic, mic_len);

	aead_request_set_tfm(aead_req, tfm);
	aead_request_set_crypt(aead_req, sg, sg, data_len + mic_len, b_0);
	aead_request_set_ad(aead_req, sg[0].length);

	err = crypto_aead_decrypt(aead_req);
	kzfree(aead_req);

	return err;
}

struct crypto_aead *ieee80211_aes_key_setup_encrypt(const u8 key[],
						    size_t key_len,
						    size_t mic_len)
{
	struct crypto_aead *tfm;
	int err;

	tfm = crypto_alloc_aead("ccm(aes)", 0, CRYPTO_ALG_ASYNC);
	if (IS_ERR(tfm))
		return tfm;

	err = crypto_aead_setkey(tfm, key, key_len);
	if (err)
		goto free_aead;
	err = crypto_aead_setauthsize(tfm, mic_len);
	if (err)
		goto free_aead;

	return tfm;

free_aead:
	crypto_free_aead(tfm);
	return ERR_PTR(err);
}

void ieee80211_aes_key_free(struct crypto_aead *tfm)
{
	crypto_free_aead(tfm);
}
Commit	Line	Data
f0706e82 JB	1	/*
	2	* Copyright 2003-2004, Instant802 Networks, Inc.
	3	* Copyright 2005-2006, Devicescape Software, Inc.
	4	*
7ec7c4a9 AB	5	* Rewrite: Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org>
7ec7c4a9 AB	6	*
f0706e82 JB	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11
172589cc	12	#include <linux/kernel.h>
f0706e82	13	#include <linux/types.h>
f0706e82	14	#include <linux/err.h>
d8fe0ddd	15	#include <crypto/aead.h>
f0706e82 JB	16
f0706e82 JB	17	#include <net/mac80211.h>
2c8dccc7	18	#include "key.h"
f0706e82 JB	19	#include "aes_ccm.h"
f0706e82 JB	20
f4a067f9 AB	21	int ieee80211_aes_ccm_encrypt(struct crypto_aead tfm, u8 b_0, u8 *aad,
	22	u8 data, size_t data_len, u8 mic,
	23	size_t mic_len)
f0706e82	24	{
957e0fe6	25	struct scatterlist sg[3];
f4a067f9 AB	26	struct aead_request *aead_req;
	27	int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm);
	28	u8 *__aad;
f0706e82	29
f4a067f9 AB	30	aead_req = kzalloc(reqsize + CCM_AAD_LEN, GFP_ATOMIC);
	31	if (!aead_req)
	32	return -ENOMEM;
6e1ee5d2	33
f4a067f9 AB	34	__aad = (u8 *)aead_req + reqsize;
f4a067f9 AB	35	memcpy(__aad, aad, CCM_AAD_LEN);
f0706e82	36
957e0fe6	37	sg_init_table(sg, 3);
f4a067f9	38	sg_set_buf(&sg[0], &__aad[2], be16_to_cpup((__be16 *)__aad));
957e0fe6 HX	39	sg_set_buf(&sg[1], data, data_len);
957e0fe6 HX	40	sg_set_buf(&sg[2], mic, mic_len);
f0706e82	41
6e1ee5d2	42	aead_request_set_tfm(aead_req, tfm);
957e0fe6 HX	43	aead_request_set_crypt(aead_req, sg, sg, data_len, b_0);
957e0fe6 HX	44	aead_request_set_ad(aead_req, sg[0].length);
f0706e82	45
6e1ee5d2	46	crypto_aead_encrypt(aead_req);
f4a067f9 AB	47	kzfree(aead_req);
	48
	49	return 0;
f0706e82 JB	50	}
f0706e82 JB	51
7ec7c4a9	52	int ieee80211_aes_ccm_decrypt(struct crypto_aead tfm, u8 b_0, u8 *aad,
2b2ba0db JM	53	u8 data, size_t data_len, u8 mic,
2b2ba0db JM	54	size_t mic_len)
f0706e82	55	{
957e0fe6	56	struct scatterlist sg[3];
f4a067f9 AB	57	struct aead_request *aead_req;
	58	int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm);
	59	u8 *__aad;
	60	int err;
7ec7c4a9	61
4f031fa9 RW	62	if (data_len == 0)
	63	return -EINVAL;
	64
f4a067f9 AB	65	aead_req = kzalloc(reqsize + CCM_AAD_LEN, GFP_ATOMIC);
	66	if (!aead_req)
	67	return -ENOMEM;
	68
	69	__aad = (u8 *)aead_req + reqsize;
	70	memcpy(__aad, aad, CCM_AAD_LEN);
7ec7c4a9	71
957e0fe6	72	sg_init_table(sg, 3);
f4a067f9	73	sg_set_buf(&sg[0], &__aad[2], be16_to_cpup((__be16 *)__aad));
957e0fe6 HX	74	sg_set_buf(&sg[1], data, data_len);
957e0fe6 HX	75	sg_set_buf(&sg[2], mic, mic_len);
7ec7c4a9	76
6e1ee5d2	77	aead_request_set_tfm(aead_req, tfm);
957e0fe6 HX	78	aead_request_set_crypt(aead_req, sg, sg, data_len + mic_len, b_0);
957e0fe6 HX	79	aead_request_set_ad(aead_req, sg[0].length);
7ec7c4a9	80
f4a067f9 AB	81	err = crypto_aead_decrypt(aead_req);
	82	kzfree(aead_req);
	83
	84	return err;
f0706e82 JB	85	}
f0706e82 JB	86
2b2ba0db JM	87	struct crypto_aead *ieee80211_aes_key_setup_encrypt(const u8 key[],
	88	size_t key_len,
	89	size_t mic_len)
f0706e82	90	{
7ec7c4a9 AB	91	struct crypto_aead *tfm;
7ec7c4a9 AB	92	int err;
f0706e82	93
7ec7c4a9 AB	94	tfm = crypto_alloc_aead("ccm(aes)", 0, CRYPTO_ALG_ASYNC);
	95	if (IS_ERR(tfm))
	96	return tfm;
f0706e82	97
2b2ba0db	98	err = crypto_aead_setkey(tfm, key, key_len);
45fd6329 DC	99	if (err)
	100	goto free_aead;
	101	err = crypto_aead_setauthsize(tfm, mic_len);
	102	if (err)
	103	goto free_aead;
	104
	105	return tfm;
f0706e82	106
45fd6329	107	free_aead:
7ec7c4a9 AB	108	crypto_free_aead(tfm);
7ec7c4a9 AB	109	return ERR_PTR(err);
f0706e82 JB	110	}
f0706e82 JB	111
7ec7c4a9	112	void ieee80211_aes_key_free(struct crypto_aead *tfm)
f0706e82	113	{
7ec7c4a9	114	crypto_free_aead(tfm);
f0706e82	115	}