mac80111: Add BIP-CMAC-256 cipher
This allows mac80211 to configure BIP-CMAC-256 to the driver and also
use software-implementation within mac80211 when the driver does not
support this with hardware accelaration.
Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/mac80211/aes_cmac.c b/net/mac80211/aes_cmac.c
index 9b9009f..4192806 100644
--- a/net/mac80211/aes_cmac.c
+++ b/net/mac80211/aes_cmac.c
@@ -18,8 +18,8 @@
#include "key.h"
#include "aes_cmac.h"
-#define AES_CMAC_KEY_LEN 16
#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
@@ -35,9 +35,9 @@
pad[AES_BLOCK_SIZE - 1] ^= 0x87;
}
-
-static void aes_128_cmac_vector(struct crypto_cipher *tfm, size_t num_elem,
- const u8 *addr[], const size_t *len, u8 *mac)
+static void aes_cmac_vector(struct crypto_cipher *tfm, size_t num_elem,
+ const u8 *addr[], const size_t *len, u8 *mac,
+ size_t mac_len)
{
u8 cbc[AES_BLOCK_SIZE], pad[AES_BLOCK_SIZE];
const u8 *pos, *end;
@@ -88,7 +88,7 @@
for (i = 0; i < AES_BLOCK_SIZE; i++)
pad[i] ^= cbc[i];
crypto_cipher_encrypt_one(tfm, pad, pad);
- memcpy(mac, pad, CMAC_TLEN);
+ memcpy(mac, pad, mac_len);
}
@@ -107,17 +107,35 @@
addr[2] = zero;
len[2] = CMAC_TLEN;
- aes_128_cmac_vector(tfm, 3, addr, len, mic);
+ aes_cmac_vector(tfm, 3, addr, len, mic, CMAC_TLEN);
}
+void ieee80211_aes_cmac_256(struct crypto_cipher *tfm, const u8 *aad,
+ const u8 *data, size_t data_len, u8 *mic)
+{
+ const u8 *addr[3];
+ size_t len[3];
+ u8 zero[CMAC_TLEN_256];
-struct crypto_cipher *ieee80211_aes_cmac_key_setup(const u8 key[])
+ memset(zero, 0, CMAC_TLEN_256);
+ addr[0] = aad;
+ len[0] = AAD_LEN;
+ addr[1] = data;
+ len[1] = data_len - CMAC_TLEN_256;
+ addr[2] = zero;
+ len[2] = CMAC_TLEN_256;
+
+ aes_cmac_vector(tfm, 3, addr, len, mic, CMAC_TLEN_256);
+}
+
+struct crypto_cipher *ieee80211_aes_cmac_key_setup(const u8 key[],
+ size_t key_len)
{
struct crypto_cipher *tfm;
tfm = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC);
if (!IS_ERR(tfm))
- crypto_cipher_setkey(tfm, key, AES_CMAC_KEY_LEN);
+ crypto_cipher_setkey(tfm, key, key_len);
return tfm;
}