cryptographic signature, put registration and messages structure

client-network/src/messages_structure.rs

@@ -0,0 +1,50 @@
+struct UDPMessage {
+    id: [u8; 4],
+    msg_type: u8,
+    length: [u8; 2],
+    body: [u8; 985],
+    signature: [u8; 32],
+}
+
+struct HandshakeMessage {
+    id: [u8; 4],
+    msg_type: u8,
+    length: [u8; 2],
+    extensions: [u8; 4],
+    name: [u8; 981],
+    signature: [u8; 32],
+}
+
+impl UDPMessage {
+    pub fn ping(id: i32) -> UDPMessage {
+        UDPMessage { id: id.to_ne_bytes(), msg_type: 0, length: [0; 2], body: [0; 985], signature: [0; 32]}
+    }
+
+    pub fn error(id: i32) -> UDPMessage {
+        
+        UDPMessage { id: id.to_ne_bytes(), msg_type: 129, length: [0; 2], body: [0; 985], signature: [0; 32]}
+    }
+    
+    pub fn hello(id: i32, length: i16, username: String) -> HandshakeMessage {
+        let username_bytes = username.as_bytes();
+    
+        let mut body: [u8; 981] = [0; 981];
+    
+        let length_to_copy = username_bytes.len().min(981);
+        body[..length_to_copy].copy_from_slice(&username_bytes[..length_to_copy]);
+        HandshakeMessage {id: id.to_ne_bytes(), msg_type: 1, length: length.to_ne_bytes(), extensions: [0;4], name: body, signature: [0;32]}
+
+    }
+
+    pub fn helloReply(id: i32, length: i16, username: String) -> HandshakeMessage {
+        let username_bytes = username.as_bytes();
+    
+        let mut body: [u8; 981] = [0; 981];
+    
+        let length_to_copy = username_bytes.len().min(981);
+        body[..length_to_copy].copy_from_slice(&username_bytes[..length_to_copy]);
+        HandshakeMessage {id: id.to_ne_bytes(), msg_type: 130, length: length.to_ne_bytes(), extensions: [0;4], name: body, signature: [0;32]}
+
+    }
+}
+