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Bluetooth: Add function for generating LE SC out-of-band data

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This patch adds a smp_generate_oob function that allows to create
local out-of-band data that can be used for pairing and also provides
the confirmation and random value.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
This commit is contained in:
Marcel Holtmann 2015-03-16 01:10:22 -07:00 committed by Johan Hedberg
parent 6e2dc6d113
commit 60a27d653d
2 changed files with 54 additions and 0 deletions
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53
net/bluetooth/smp.c
View File

@ -74,6 +74,12 @@ enum {
};
struct smp_dev {
/* Secure Connections OOB data */
u8 local_pk[64];
u8 local_sk[32];
u8 local_rr[16];
bool debug_key;
struct crypto_blkcipher *tfm_aes;
struct crypto_hash *tfm_cmac;
};
@ -526,6 +532,53 @@ int smp_generate_rpa(struct hci_dev *hdev, const u8 irk[16], bdaddr_t *rpa)
return 0;
}
int smp_generate_oob(struct hci_dev *hdev, u8 hash[16], u8 rand[16])
{
struct l2cap_chan *chan = hdev->smp_data;
struct smp_dev *smp;
int err;
if (!chan || !chan->data)
return -EOPNOTSUPP;
smp = chan->data;
if (hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS)) {
BT_DBG("Using debug keys");
memcpy(smp->local_pk, debug_pk, 64);
memcpy(smp->local_sk, debug_sk, 32);
smp->debug_key = true;
} else {
while (true) {
/* Generate local key pair for Secure Connections */
if (!ecc_make_key(smp->local_pk, smp->local_sk))
return -EIO;
/* This is unlikely, but we need to check that
* we didn't accidentially generate a debug key.
*/
if (memcmp(smp->local_sk, debug_sk, 32))
break;
}
smp->debug_key = false;
}
SMP_DBG("OOB Public Key X: %32phN", smp->local_pk);
SMP_DBG("OOB Public Key Y: %32phN", smp->local_pk + 32);
SMP_DBG("OOB Private Key: %32phN", smp->local_sk);
get_random_bytes(smp->local_rr, 16);
err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->local_pk,
smp->local_rr, 0, hash);
if (err < 0)
return err;
memcpy(rand, smp->local_rr, 16);
return 0;
}
static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data)
{
struct l2cap_chan *chan = conn->smp;

1
net/bluetooth/smp.h
View File

@ -188,6 +188,7 @@ int smp_user_confirm_reply(struct hci_conn *conn, u16 mgmt_op, __le32 passkey);
bool smp_irk_matches(struct hci_dev *hdev, const u8 irk[16],
const bdaddr_t *bdaddr);
int smp_generate_rpa(struct hci_dev *hdev, const u8 irk[16], bdaddr_t *rpa);
int smp_generate_oob(struct hci_dev *hdev, u8 hash[16], u8 rand[16]);
int smp_register(struct hci_dev *hdev);
void smp_unregister(struct hci_dev *hdev);