From b1e2b3ae97620752905e58a9682fad7222796566 Mon Sep 17 00:00:00 2001 From: Johan Hedberg Date: Sun, 23 Feb 2014 19:42:19 +0200 Subject: [PATCH] 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: Johan Hedberg Signed-off-by: Marcel Holtmann --- net/bluetooth/smp.c | 18 ++++++++++++++++++ net/bluetooth/smp.h | 1 + 2 files changed, 19 insertions(+) diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c index b9eef494fc0a..79a80f44c832 100644 --- a/net/bluetooth/smp.c +++ b/net/bluetooth/smp.c @@ -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]) diff --git a/net/bluetooth/smp.h b/net/bluetooth/smp.h index d8cc543f523c..f32f1212f650 100644 --- a/net/bluetooth/smp.h +++ b/net/bluetooth/smp.h @@ -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 */ -- 2.20.1