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Bluetooth: BR: improve br_sufficient_key_size

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Currently, the minimum value of encryption key size is
`BT_HCI_ENCRYPTION_KEY_SIZE_MIN`.

Add a new Kconfig `BT_BR_MIN_ENC_KEY_SIZE`. It is used to set the
specific minimum encryption key size.
The default value is `BT_SMP_MIN_ENC_KEY_SIZE`. And it can be
configured if `BT_SMP_SC_ONLY` is not enabled.

Use `CONFIG_BT_BR_MIN_ENC_KEY_SIZE` as minimum encryption key size in
`br_sufficient_key_size`.

Signed-off-by: Lyle Zhu <lyle.zhu@nxp.com>
This commit is contained in:
Lyle Zhu 2024-06-07 17:49:54 +08:00 • committed by Benjamin Cabé
commit 2424bfd869
2 changed files with 10 additions and 1 deletions
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9
subsys/bluetooth/host/classic/Kconfig
View file

@ -18,6 +18,15 @@ config BT_CLASSIC
This option enables Bluetooth BR/EDR support This option enables Bluetooth BR/EDR support
if BT_CLASSIC if BT_CLASSIC
config BT_BR_MIN_ENC_KEY_SIZE
int
prompt "Minimum encryption key size accepted in octets" if !BT_SMP_SC_ONLY
default BT_SMP_MIN_ENC_KEY_SIZE
range 7 16
help
This option sets the minimum encryption key size accepted during pairing
for classic.
config BT_MAX_SCO_CONN config BT_MAX_SCO_CONN
int "Maximum number of simultaneous SCO connections" int "Maximum number of simultaneous SCO connections"
default 1 default 1

2
subsys/bluetooth/host/classic/br.c
View file

@ -141,7 +141,7 @@ static bool br_sufficient_key_size(struct bt_conn *conn)
return key_size == BT_HCI_ENCRYPTION_KEY_SIZE_MAX; return key_size == BT_HCI_ENCRYPTION_KEY_SIZE_MAX;
} }
return key_size >= BT_HCI_ENCRYPTION_KEY_SIZE_MIN; return key_size >= CONFIG_BT_BR_MIN_ENC_KEY_SIZE;
} }
bool bt_br_update_sec_level(struct bt_conn *conn) bool bt_br_update_sec_level(struct bt_conn *conn)