code: def process(self, senderKeyName, senderKeyDistributionMessage):
          
          senderKeyRecord = self.senderKeyStore.loadSenderKey(senderKeyName)
          senderKeyRecord.addSenderKeyState(senderKeyDistributionMessage.getId(),
                                            senderKeyDistributionMessage.getIteration(),
                                            senderKeyDistributionMessage.getChainKey(),
                                            senderKeyDistributionMessage.getSignatureKey())
          self.senderKeyStore.storeSenderKey(senderKeyName, senderKeyRecord)
docs: :type senderKeyName: SenderKeyName
          :type senderKeyDistributionMessage: SenderKeyDistributionMessage