Bluetooth: Use actual encryption key size for SMP over BR/EDR

When pairing over SMP over BR/EDR the generated LTK has by default the
same key size as the BR/EDR Link Key. Make sure we don't set our
Pairing Request/Response max value to anything higher than that.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index d9ed5e8..3d0f7d2 100644 (file)
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -1705,7 +1705,7 @@ static void build_bredr_pairing_cmd(struct smp_chan *smp,
 
                req->init_key_dist   = local_dist;
                req->resp_key_dist   = remote_dist;
-               req->max_key_size    = SMP_MAX_ENC_KEY_SIZE;
+               req->max_key_size    = conn->hcon->enc_key_size;
 
                smp->remote_key_dist = remote_dist;
 
@@ -1714,7 +1714,7 @@ static void build_bredr_pairing_cmd(struct smp_chan *smp,
 
        memset(rsp, 0, sizeof(*rsp));
 
-       rsp->max_key_size    = SMP_MAX_ENC_KEY_SIZE;
+       rsp->max_key_size    = conn->hcon->enc_key_size;
        rsp->init_key_dist   = req->init_key_dist & remote_dist;
        rsp->resp_key_dist   = req->resp_key_dist & local_dist;