Add Bose manufacturer data implementation (issue #18)

bose_manufacturer_data.py

@@ -0,0 +1,31 @@
+import hashlib
+
+
+def unextract_manufacturer_id(manufacturer_id: int, manufacturer_data: bytes) -> bytes:
+    manufacturer_id_bytes = bytes([manufacturer_id & 0xFF, (manufacturer_id >> 8) & 0xFF])
+    return manufacturer_id_bytes + manufacturer_data
+
+
+def mac_hash(mac: bytes, data: bytes) -> bytes:
+    new_data = data[:4] + mac + data[9:]
+    hash_data = new_data.hex().upper().encode("utf-8")
+    return hashlib.sha256(hash_data).digest()
+
+
+def is_bose_device(mac: bytes, data: bytes) -> bool:
+    partial_mac_hash = data[4:9]
+    return partial_mac_hash in mac_hash(mac, data) # possibly ok implementation?
+    # return partial_mac_hash.hex() in mac_hash(mac, data).hex() # official implementation via .hex()
+
+
+# from bluez dbus
+mac = bytes([0x4C, 0x87, 0x5D, 0x53, 0xF2, 0xCF])
+manufacturer_id = 2305
+manufacturer_data = bytes([113, 18, 177, 27, 65, 149, 232, 52, 213, 174, 45, 195, 82])
+
+# reconstruct full manufacturer data
+# bose doesn't use manufacturer id correctly
+# data = bytes([1, 9, 113, 18, 177, 27, 65, 149, 232, 52, 213, 174, 45, 195, 82])
+data = unextract_manufacturer_id(manufacturer_id, manufacturer_data)
+
+print(is_bose_device(mac, data))