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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>
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2 changed files with 30 additions and 0 deletions
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@ -3222,6 +3222,19 @@ void ieee80211_get_tkip_rx_p1k(struct ieee80211_key_conf *keyconf,
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void ieee80211_get_tkip_p2k(struct ieee80211_key_conf *keyconf,
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struct sk_buff *skb, u8 *p2k);
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/**
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* ieee80211_aes_cmac_calculate_k1_k2 - calculate the AES-CMAC sub keys
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*
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* This function computes the two AES-CMAC sub-keys, based on the
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* previously installed master key.
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*
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* @keyconf: the parameter passed with the set key
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* @k1: a buffer to be filled with the 1st sub-key
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* @k2: a buffer to be filled with the 2nd sub-key
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*/
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void ieee80211_aes_cmac_calculate_k1_k2(struct ieee80211_key_conf *keyconf,
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u8 *k1, u8 *k2);
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/**
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* struct ieee80211_key_seq - key sequence counter
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*
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@ -126,3 +126,20 @@ void ieee80211_aes_cmac_key_free(struct crypto_cipher *tfm)
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{
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crypto_free_cipher(tfm);
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}
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void ieee80211_aes_cmac_calculate_k1_k2(struct ieee80211_key_conf *keyconf,
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u8 *k1, u8 *k2)
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{
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u8 l[AES_BLOCK_SIZE] = {};
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struct ieee80211_key *key =
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container_of(keyconf, struct ieee80211_key, conf);
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crypto_cipher_encrypt_one(key->u.aes_cmac.tfm, l, l);
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memcpy(k1, l, AES_BLOCK_SIZE);
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gf_mulx(k1);
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memcpy(k2, k1, AES_BLOCK_SIZE);
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gf_mulx(k2);
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}
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EXPORT_SYMBOL(ieee80211_aes_cmac_calculate_k1_k2);
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