Release 4.14 net/mac80211/aes_cmac.c

/*
 * AES-128-CMAC with TLen 16 for IEEE 802.11w BIP
 * Copyright 2008, Jouni Malinen <j@w1.fi>
 *
 * 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/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 CMAC_TLEN 8 
/* CMAC TLen = 64 bits (8 octets) */

#define CMAC_TLEN_256 16 
/* CMAC TLen = 128 bits (16 octets) */

#define AAD_LEN 20


static const u8 zero[CMAC_TLEN_256];



void ieee80211_aes_cmac(struct crypto_shash *tfm, const u8 *aad,
			const u8 *data, size_t data_len, u8 *mic)
{
	SHASH_DESC_ON_STACK(desc, tfm);
	u8 out[AES_BLOCK_SIZE];

	desc->tfm = tfm;

	crypto_shash_init(desc);
	crypto_shash_update(desc, aad, AAD_LEN);
	crypto_shash_update(desc, data, data_len - CMAC_TLEN);
	crypto_shash_finup(desc, zero, CMAC_TLEN, out);

	memcpy(mic, out, CMAC_TLEN);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jouni Malinen
51
56.04%
2
66.67%
Ard Biesheuvel
40
43.96%
1
33.33%
Total
91
100.00%
3
100.00%



void ieee80211_aes_cmac_256(struct crypto_shash *tfm, const u8 *aad,
			    const u8 *data, size_t data_len, u8 *mic)
{
	SHASH_DESC_ON_STACK(desc, tfm);

	desc->tfm = tfm;

	crypto_shash_init(desc);
	crypto_shash_update(desc, aad, AAD_LEN);
	crypto_shash_update(desc, data, data_len - CMAC_TLEN_256);
	crypto_shash_finup(desc, zero, CMAC_TLEN_256, mic);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jouni Malinen
51
67.11%
2
66.67%
Ard Biesheuvel
25
32.89%
1
33.33%
Total
76
100.00%
3
100.00%



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))
		crypto_shash_setkey(tfm, key, key_len);

	return tfm;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jouni Malinen
44
86.27%
2
50.00%
Ard Biesheuvel
6
11.76%
1
25.00%
Ben Hutchings
1
1.96%
1
25.00%
Total
51
100.00%
4
100.00%



void ieee80211_aes_cmac_key_free(struct crypto_shash *tfm)
{
	crypto_free_shash(tfm);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jouni Malinen
13
86.67%
1
50.00%
Ard Biesheuvel
2
13.33%
1
50.00%
Total
15
100.00%
2
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Jouni Malinen
198
69.96%
2
33.33%
Ard Biesheuvel
78
27.56%
1
16.67%
Johannes Berg
3
1.06%
1
16.67%
Emmanuel Grumbach
3
1.06%
1
16.67%
Ben Hutchings
1
0.35%
1
16.67%
Total
283
100.00%
6
100.00%
Directory: net/mac80211

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