encryption + helpers + contact card compression + server routing start

client/server.go

@@ -102,3 +102,11 @@ func (ints *InternalServer) PackServerMessage(payload []byte, signature []byte)
 	}
 	return out, nil
 }
+
+func (ints *InternalServer) UnPackServerMessage(protoPackedMessage []byte) (payload []byte, signature []byte, err error) {
+	msg := &meowlib.PackedServerMessage{}
+	if err := proto.Unmarshal(protoPackedMessage, msg); err != nil {
+		return nil, nil, err
+	}
+	return msg.Payload, msg.Signature, nil
+}