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Bluetooth: AMP: Add AMP key calculation 

Function calculates AMP keys using hmac_sha256 helper. Calculated keys
are Generic AMP Link Key (gamp) and Dedicated AMP Link Key with
keyID "802b" for 802.11 PAL.

Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
This commit is contained in:
Andrei Emeltchenko 2012-09-27 17:26:18 +03:00 committed by Gustavo Padovan
parent ba221bbaba
commit 5a34918669
3 changed files with 48 additions and 0 deletions
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2
include/net/bluetooth/amp.h
View File

@ -32,6 +32,8 @@ void amp_ctrl_list_flush(struct amp_mgr *mgr);
struct hci_conn *phylink_add(struct hci_dev *hdev, struct amp_mgr *mgr, struct hci_conn *phylink_add(struct hci_dev *hdev, struct amp_mgr *mgr,
u8 remote_id); u8 remote_id);
int phylink_gen_key(struct hci_conn *hcon, u8 *data, u8 *len, u8 *type);
void amp_read_loc_info(struct hci_dev *hdev, struct amp_mgr *mgr); void amp_read_loc_info(struct hci_dev *hdev, struct amp_mgr *mgr);
void amp_read_loc_assoc_frag(struct hci_dev *hdev, u8 phy_handle); void amp_read_loc_assoc_frag(struct hci_dev *hdev, u8 phy_handle);
void amp_read_loc_assoc(struct hci_dev *hdev, struct amp_mgr *mgr); void amp_read_loc_assoc(struct hci_dev *hdev, struct amp_mgr *mgr);

1
net/bluetooth/Kconfig
View File

@ -11,6 +11,7 @@ menuconfig BT
select CRYPTO_BLKCIPHER select CRYPTO_BLKCIPHER
select CRYPTO_AES select CRYPTO_AES
select CRYPTO_ECB select CRYPTO_ECB
select CRYPTO_SHA256
help help
Bluetooth is low-cost, low-power, short-range wireless technology. Bluetooth is low-cost, low-power, short-range wireless technology.
It was designed as a replacement for cables and other short-range It was designed as a replacement for cables and other short-range

45
net/bluetooth/amp.c
View File

@ -161,6 +161,51 @@ static int hmac_sha256(u8 *key, u8 ksize, char *plaintext, u8 psize, u8 *output)
return ret; return ret;
} }
int phylink_gen_key(struct hci_conn *conn, u8 *data, u8 *len, u8 *type)
{
struct hci_dev *hdev = conn->hdev;
struct link_key *key;
u8 keybuf[HCI_AMP_LINK_KEY_SIZE];
u8 gamp_key[HCI_AMP_LINK_KEY_SIZE];
int err;
if (!hci_conn_check_link_mode(conn))
return -EACCES;
BT_DBG("conn %p key_type %d", conn, conn->key_type);
/* Legacy key */
if (conn->key_type < 3) {
BT_ERR("Legacy key type %d", conn->key_type);
return -EACCES;
}
*type = conn->key_type;
*len = HCI_AMP_LINK_KEY_SIZE;
key = hci_find_link_key(hdev, &conn->dst);
/* BR/EDR Link Key concatenated together with itself */
memcpy(&keybuf[0], key->val, HCI_LINK_KEY_SIZE);
memcpy(&keybuf[HCI_LINK_KEY_SIZE], key->val, HCI_LINK_KEY_SIZE);
/* Derive Generic AMP Link Key (gamp) */
err = hmac_sha256(keybuf, HCI_AMP_LINK_KEY_SIZE, "gamp", 4, gamp_key);
if (err) {
BT_ERR("Could not derive Generic AMP Key: err %d", err);
return err;
}
if (conn->key_type == HCI_LK_DEBUG_COMBINATION) {
BT_DBG("Use Generic AMP Key (gamp)");
memcpy(data, gamp_key, HCI_AMP_LINK_KEY_SIZE);
return err;
}
/* Derive Dedicated AMP Link Key: "802b" is 802.11 PAL keyID */
return hmac_sha256(gamp_key, HCI_AMP_LINK_KEY_SIZE, "802b", 4, data);
}
void amp_read_loc_assoc_frag(struct hci_dev *hdev, u8 phy_handle) void amp_read_loc_assoc_frag(struct hci_dev *hdev, u8 phy_handle)
{ {
struct hci_cp_read_local_amp_assoc cp; struct hci_cp_read_local_amp_assoc cp;