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mac80211: expose AES-CMAC subkey calculation 

Expose a function for the AES-CMAC subkey calculation
to drivers. This is the first step of the AES-CMAC
cipher key setup and may be required for CMAC hardware
offloading.

Signed-off-by: Assaf Krauss <assaf.krauss@intel.com>
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Assaf Krauss 2012-08-01 15:12:48 +03:00 committed by Johannes Berg
parent 9a90bc8191
commit 5d0d04e477
2 changed files with 30 additions and 0 deletions
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13
include/net/mac80211.h
View File

@ -3222,6 +3222,19 @@ void ieee80211_get_tkip_rx_p1k(struct ieee80211_key_conf *keyconf,
void ieee80211_get_tkip_p2k(struct ieee80211_key_conf *keyconf,
struct sk_buff *skb, u8 *p2k);
/**
* ieee80211_aes_cmac_calculate_k1_k2 - calculate the AES-CMAC sub keys
*
* This function computes the two AES-CMAC sub-keys, based on the
* previously installed master key.
*
* @keyconf: the parameter passed with the set key
* @k1: a buffer to be filled with the 1st sub-key
* @k2: a buffer to be filled with the 2nd sub-key
*/
void ieee80211_aes_cmac_calculate_k1_k2(struct ieee80211_key_conf *keyconf,
u8 *k1, u8 *k2);
/**
* struct ieee80211_key_seq - key sequence counter
*

17
net/mac80211/aes_cmac.c
View File

@ -126,3 +126,20 @@ void ieee80211_aes_cmac_key_free(struct crypto_cipher *tfm)
{
crypto_free_cipher(tfm);
}
void ieee80211_aes_cmac_calculate_k1_k2(struct ieee80211_key_conf *keyconf,
u8 *k1, u8 *k2)
{
u8 l[AES_BLOCK_SIZE] = {};
struct ieee80211_key *key =
container_of(keyconf, struct ieee80211_key, conf);
crypto_cipher_encrypt_one(key->u.aes_cmac.tfm, l, l);
memcpy(k1, l, AES_BLOCK_SIZE);
gf_mulx(k1);
memcpy(k2, k1, AES_BLOCK_SIZE);
gf_mulx(k2);
}
EXPORT_SYMBOL(ieee80211_aes_cmac_calculate_k1_k2);