Commit b1e2b3ae authored by Johan Hedberg's avatar Johan Hedberg Committed by Marcel Holtmann
Browse files

Bluetooth: Add SMP function for generating RPAs 



We need a function in smp.c to generate Resolvable Random Addresses in
order to support privacy. The local RPA will need to be generated before
advertising, scanning or connecting and regenerated at periodic
intervals. This patch adds the necessary function for RPA generation.

Signed-off-by: default avatarJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent 82d4b359

net/bluetooth/smp.c

+18 −0
Original line number Diff line number Diff line
@@ -124,6 +124,24 @@ bool smp_irk_matches(struct crypto_blkcipher *tfm, u8 irk[16], 
	return !memcmp(bdaddr->b, hash, 3);

}



int smp_generate_rpa(struct crypto_blkcipher *tfm, u8 irk[16], bdaddr_t *rpa)

{

	int err;



	get_random_bytes(&rpa->b[3], 3);



	rpa->b[5] &= 0x3f;	/* Clear two most significant bits */

	rpa->b[5] |= 0x40;	/* Set second most significant bit */



	err = smp_ah(tfm, irk, &rpa->b[3], rpa->b);

	if (err < 0)

		return err;



	BT_DBG("RPA %pMR", rpa);



	return 0;

}



static int smp_c1(struct crypto_blkcipher *tfm, u8 k[16], u8 r[16],

		  u8 preq[7], u8 pres[7], u8 _iat, bdaddr_t *ia,

		  u8 _rat, bdaddr_t *ra, u8 res[16])

net/bluetooth/smp.h

+1 −0
Original line number Diff line number Diff line
@@ -152,5 +152,6 @@ void smp_chan_destroy(struct l2cap_conn *conn); 


bool smp_irk_matches(struct crypto_blkcipher *tfm, u8 irk[16],

		     bdaddr_t *bdaddr);

int smp_generate_rpa(struct crypto_blkcipher *tfm, u8 irk[16], bdaddr_t *rpa);



#endif /* __SMP_H */

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