Fix packing sub_cmd.

sub_cmd is an unsigned char, since VENDOR_PROTOTYPE is 0xff. If not, it cannot be encoded. Signed-off-by: Pol Henarejos <[email protected]>
Yubico · Nov 2, 2023 · 4abb4a5 · 4abb4a5
1 parent 032dd8b
commit 4abb4a5
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/fido2/ctap2/config.py b/fido2/ctap2/config.py
@@ -86,7 +86,7 @@ def _call(self, sub_cmd, params=None):
             msg = (
                 b"\xff" * 32
                 + b"\x0d"
-                + struct.pack("<b", sub_cmd)
+                + struct.pack("<B", sub_cmd)
                 + (cbor.encode(params) if params else b"")
             )
             pin_uv_protocol = self.pin_uv.protocol.VERSION