Commit 407cecf6 authored by Johan Hedberg's avatar Johan Hedberg Committed by Marcel Holtmann
Browse files

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: default avatarJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent df8e1a4c

net/bluetooth/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ menuconfig BT 
	select CRYPTO

	select CRYPTO_BLKCIPHER

	select CRYPTO_AES

	select CRYPTO_CMAC

	select CRYPTO_ECB

	select CRYPTO_SHA256

	help

net/bluetooth/smp.c

+10 −0
Original line number Diff line number Diff line
@@ -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;

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