From: Johan Hedberg <johan.hedberg@xxxxxxxxx>
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@xxxxxxxxx>
---
net/bluetooth/Kconfig | 1 +
net/bluetooth/smp.c | 10 ++++++++++
2 files changed, 11 insertions(+)
diff --git a/net/bluetooth/Kconfig b/net/bluetooth/Kconfig
index 5e97a8ff850b..29bcafc41adf 100644
--- a/net/bluetooth/Kconfig
+++ b/net/bluetooth/Kconfig
@@ -10,6 +10,7 @@ menuconfig BT
select CRYPTO
select CRYPTO_BLKCIPHER
select CRYPTO_AES
+ select CRYPTO_CMAC
select CRYPTO_ECB
select CRYPTO_SHA256
help
diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index d993d7d4fcc8..4fed367da380 100644
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -72,6 +72,7 @@ struct smp_chan {
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 @@ static void smp_chan_destroy(struct l2cap_conn *conn)
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 @@ static struct smp_chan *smp_chan_create(struct l2cap_conn *conn)
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;
--
2.1.0
--
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