Bluetooth: Add basic support for AES-CMAC
Most of the LE Secure Connections SMP crypto functions build on top of
the AES-CMAC function. This patch adds access to AES-CMAC in the kernel
crypto subsystem by allocating a crypto_hash handle for it in a similar
way that we have one for AES-CBC.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index d993d7d..4fed367 100644
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -72,6 +72,7 @@
unsigned long flags;
struct crypto_blkcipher *tfm_aes;
+ struct crypto_hash *tfm_cmac;
};
static inline void swap_buf(const u8 *src, u8 *dst, size_t len)
@@ -396,6 +397,7 @@
kfree(smp->slave_csrk);
crypto_free_blkcipher(smp->tfm_aes);
+ crypto_free_hash(smp->tfm_cmac);
/* If pairing failed clean up any keys we might have */
if (!complete) {
@@ -861,6 +863,14 @@
return NULL;
}
+ smp->tfm_cmac = crypto_alloc_hash("cmac(aes)", 0, CRYPTO_ALG_ASYNC);
+ if (IS_ERR(smp->tfm_cmac)) {
+ BT_ERR("Unable to create CMAC crypto context");
+ crypto_free_blkcipher(smp->tfm_aes);
+ kfree(smp);
+ return NULL;
+ }
+
smp->conn = conn;
chan->data = smp;