Contributors: 8
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Jouni Malinen |
168 |
50.00% |
3 |
21.43% |
| Chien Wong |
70 |
20.83% |
3 |
21.43% |
| Ard Biesheuvel |
55 |
16.37% |
1 |
7.14% |
| Johannes Berg |
23 |
6.85% |
3 |
21.43% |
| Jiri Benc |
15 |
4.46% |
1 |
7.14% |
| Emmanuel Grumbach |
3 |
0.89% |
1 |
7.14% |
| Thomas Gleixner |
1 |
0.30% |
1 |
7.14% |
| Ben Hutchings |
1 |
0.30% |
1 |
7.14% |
| Total |
336 |
|
14 |
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* AES-128-CMAC with TLen 16 for IEEE 802.11w BIP
* Copyright 2008, Jouni Malinen <j@w1.fi>
* Copyright (C) 2020 Intel Corporation
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/crypto.h>
#include <linux/export.h>
#include <linux/err.h>
#include <crypto/aes.h>
#include <net/mac80211.h>
#include "key.h"
#include "aes_cmac.h"
#define AAD_LEN 20
static const u8 zero[IEEE80211_CMAC_256_MIC_LEN];
int ieee80211_aes_cmac(struct crypto_shash *tfm, const u8 *aad,
const u8 *data, size_t data_len, u8 *mic,
unsigned int mic_len)
{
int err;
SHASH_DESC_ON_STACK(desc, tfm);
u8 out[AES_BLOCK_SIZE];
const __le16 *fc;
desc->tfm = tfm;
err = crypto_shash_init(desc);
if (err)
return err;
err = crypto_shash_update(desc, aad, AAD_LEN);
if (err)
return err;
fc = (const __le16 *)aad;
if (ieee80211_is_beacon(*fc)) {
/* mask Timestamp field to zero */
err = crypto_shash_update(desc, zero, 8);
if (err)
return err;
err = crypto_shash_update(desc, data + 8,
data_len - 8 - mic_len);
if (err)
return err;
} else {
err = crypto_shash_update(desc, data, data_len - mic_len);
if (err)
return err;
}
err = crypto_shash_finup(desc, zero, mic_len, out);
if (err)
return err;
memcpy(mic, out, mic_len);
return 0;
}
struct crypto_shash *ieee80211_aes_cmac_key_setup(const u8 key[],
size_t key_len)
{
struct crypto_shash *tfm;
tfm = crypto_alloc_shash("cmac(aes)", 0, 0);
if (!IS_ERR(tfm)) {
int err = crypto_shash_setkey(tfm, key, key_len);
if (err) {
crypto_free_shash(tfm);
return ERR_PTR(err);
}
}
return tfm;
}
void ieee80211_aes_cmac_key_free(struct crypto_shash *tfm)
{
crypto_free_shash(tfm);
}