From: Assaf Krauss <assaf.krauss@xxxxxxxxx>
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@xxxxxxxxx>
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
include/net/mac80211.h | 13 +++++++++++++
net/mac80211/aes_cmac.c | 17 +++++++++++++++++
2 files changed, 30 insertions(+)
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 71c2f9c..00b7204 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -3223,6 +3223,19 @@ 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
*
* @tkip: TKIP data, containing IV32 and IV16 in host byte order
diff --git a/net/mac80211/aes_cmac.c b/net/mac80211/aes_cmac.c
index a04752e..4933535 100644
--- a/net/mac80211/aes_cmac.c
+++ b/net/mac80211/aes_cmac.c
@@ -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);
--
1.7.10.4
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