[linux-2.6-block.git] / net / mac80211 / aes_gcm.c

/*
 * Copyright 2014-2015, Qualcomm Atheros, Inc.
 *
 * 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_gcm.h"

void ieee80211_aes_gcm_encrypt(struct crypto_aead *tfm, u8 *j_0, u8 *aad,
			       u8 *data, size_t data_len, u8 *mic)
{
	struct scatterlist sg[3];

	char aead_req_data[sizeof(struct aead_request) +
			   crypto_aead_reqsize(tfm)]
		__aligned(__alignof__(struct aead_request));
	struct aead_request *aead_req = (void *)aead_req_data;

	memset(aead_req, 0, sizeof(aead_req_data));

	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, IEEE80211_GCMP_MIC_LEN);

	aead_request_set_tfm(aead_req, tfm);
	aead_request_set_crypt(aead_req, sg, sg, data_len, j_0);
	aead_request_set_ad(aead_req, sg[0].length);

	crypto_aead_encrypt(aead_req);
}

int ieee80211_aes_gcm_decrypt(struct crypto_aead *tfm, u8 *j_0, u8 *aad,
			      u8 *data, size_t data_len, u8 *mic)
{
	struct scatterlist sg[3];
	char aead_req_data[sizeof(struct aead_request) +
			   crypto_aead_reqsize(tfm)]
		__aligned(__alignof__(struct aead_request));
	struct aead_request *aead_req = (void *)aead_req_data;

	if (data_len == 0)
		return -EINVAL;

	memset(aead_req, 0, sizeof(aead_req_data));

	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, IEEE80211_GCMP_MIC_LEN);

	aead_request_set_tfm(aead_req, tfm);
	aead_request_set_crypt(aead_req, sg, sg,
			       data_len + IEEE80211_GCMP_MIC_LEN, j_0);
	aead_request_set_ad(aead_req, sg[0].length);

	return crypto_aead_decrypt(aead_req);
}

struct crypto_aead *ieee80211_aes_gcm_key_setup_encrypt(const u8 key[],
							size_t key_len)
{
	struct crypto_aead *tfm;
	int err;

	tfm = crypto_alloc_aead("gcm(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, IEEE80211_GCMP_MIC_LEN);
	if (err)
		goto free_aead;

	return tfm;

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

void ieee80211_aes_gcm_key_free(struct crypto_aead *tfm)
{
	crypto_free_aead(tfm);
}
Commit	Line	Data
00b9cfa3 JM	1	/*
	2	* Copyright 2014-2015, Qualcomm Atheros, Inc.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*/
	8
	9	#include <linux/kernel.h>
	10	#include <linux/types.h>
00b9cfa3	11	#include <linux/err.h>
d8fe0ddd	12	#include <crypto/aead.h>
00b9cfa3 JM	13
	14	#include <net/mac80211.h>
	15	#include "key.h"
	16	#include "aes_gcm.h"
	17
	18	void ieee80211_aes_gcm_encrypt(struct crypto_aead tfm, u8 j_0, u8 *aad,
	19	u8 data, size_t data_len, u8 mic)
	20	{
957e0fe6	21	struct scatterlist sg[3];
00b9cfa3 JM	22
	23	char aead_req_data[sizeof(struct aead_request) +
	24	crypto_aead_reqsize(tfm)]
	25	__aligned(__alignof__(struct aead_request));
	26	struct aead_request aead_req = (void )aead_req_data;
	27
	28	memset(aead_req, 0, sizeof(aead_req_data));
	29
957e0fe6 HX	30	sg_init_table(sg, 3);
	31	sg_set_buf(&sg[0], &aad[2], be16_to_cpup((__be16 *)aad));
	32	sg_set_buf(&sg[1], data, data_len);
	33	sg_set_buf(&sg[2], mic, IEEE80211_GCMP_MIC_LEN);
00b9cfa3 JM	34
00b9cfa3 JM	35	aead_request_set_tfm(aead_req, tfm);
957e0fe6 HX	36	aead_request_set_crypt(aead_req, sg, sg, data_len, j_0);
957e0fe6 HX	37	aead_request_set_ad(aead_req, sg[0].length);
00b9cfa3 JM	38
	39	crypto_aead_encrypt(aead_req);
	40	}
	41
	42	int ieee80211_aes_gcm_decrypt(struct crypto_aead tfm, u8 j_0, u8 *aad,
	43	u8 data, size_t data_len, u8 mic)
	44	{
957e0fe6	45	struct scatterlist sg[3];
00b9cfa3 JM	46	char aead_req_data[sizeof(struct aead_request) +
	47	crypto_aead_reqsize(tfm)]
	48	__aligned(__alignof__(struct aead_request));
	49	struct aead_request aead_req = (void )aead_req_data;
	50
	51	if (data_len == 0)
	52	return -EINVAL;
	53
	54	memset(aead_req, 0, sizeof(aead_req_data));
	55
957e0fe6 HX	56	sg_init_table(sg, 3);
	57	sg_set_buf(&sg[0], &aad[2], be16_to_cpup((__be16 *)aad));
	58	sg_set_buf(&sg[1], data, data_len);
	59	sg_set_buf(&sg[2], mic, IEEE80211_GCMP_MIC_LEN);
00b9cfa3 JM	60
00b9cfa3 JM	61	aead_request_set_tfm(aead_req, tfm);
957e0fe6	62	aead_request_set_crypt(aead_req, sg, sg,
00b9cfa3	63	data_len + IEEE80211_GCMP_MIC_LEN, j_0);
957e0fe6	64	aead_request_set_ad(aead_req, sg[0].length);
00b9cfa3 JM	65
	66	return crypto_aead_decrypt(aead_req);
	67	}
	68
	69	struct crypto_aead *ieee80211_aes_gcm_key_setup_encrypt(const u8 key[],
	70	size_t key_len)
	71	{
	72	struct crypto_aead *tfm;
	73	int err;
	74
	75	tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC);
	76	if (IS_ERR(tfm))
	77	return tfm;
	78
	79	err = crypto_aead_setkey(tfm, key, key_len);
07862e13 JB	80	if (err)
	81	goto free_aead;
	82	err = crypto_aead_setauthsize(tfm, IEEE80211_GCMP_MIC_LEN);
	83	if (err)
	84	goto free_aead;
	85
	86	return tfm;
00b9cfa3	87
07862e13	88	free_aead:
00b9cfa3 JM	89	crypto_free_aead(tfm);
	90	return ERR_PTR(err);
	91	}
	92
	93	void ieee80211_aes_gcm_key_free(struct crypto_aead *tfm)
	94	{
	95	crypto_free_aead(tfm);
	96	}