diff --git a/src/bin/constants.rs b/src/bin/constants.rs
new file mode 100644
index 0000000..d4b20e8
--- /dev/null
+++ b/src/bin/constants.rs
@@ -0,0 +1,2 @@
+pub const KEYBYTE: u8 = 0b1;
+pub const MSGBYTE: u8 = 0b01;