def __init__ (self, eid, mask, ts, ack, otp):
self.msg_type = MSG_OTP_ACK
self.eid = IPAddr(eid) #EID to register
#self.mask = struct.pack('>I', mask)#EID mask
self.mask = mask
gammaplain = Gamma(eid, mask, ts, ack, otp)
self.gamma = gammaplain.encrypt()
return
