97 lines
2.4 KiB
C
97 lines
2.4 KiB
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);
|
|
}
|