SHA1 HMAC is a keyed 160bit CRC anyway. Use that

hblink.py

@@ -245,7 +245,7 @@ class OPENBRIDGE(DatagramProtocol):
                         return
 
                 # Userland actions -- typically this is the function you subclass for an application
-                self.dmrd_received(_peer_id, _rf_src, _dst_id, _seq, _slot, _call_type, _frame_type, _dtype_vseq, _stream_id, _data)
+                self.dmrd_received(_peer_id, _rf_src, _dst_id, _seq, _slot, _call_type, _frame_type, _dtype_vseq, _stream_id, _data,_hash)
                 #Silently treat a DMRD packet like a keepalive - this is because it's traffic and the 
                 #Other end may not have enabled ENAHNCED_OBP
                 self._config['_bcka'] = time()