wip structures and message signature

client-network/src/cryptographic_signature.rs

@@ -1,8 +1,16 @@
+use crate::messages_structure::HandshakeMessage;
 use p256::ecdsa::{
     Signature, SigningKey, VerifyingKey,
     signature::{Signer, Verifier},
 };
 use rand_core::OsRng;
+use sha2::{Digest, Sha256};
+
+pub enum MathError {
+        DivisionByZero,
+        NonPositiveLogarithm,
+        NegativeSquareRoot,
+    }
 
 ///
 /// contains the ecdsa private key, the ecdsa public key and the username
@@ -40,16 +48,52 @@ pub fn formatPubKey(crypto_pair: CryptographicSignature) -> String  {
     hex::encode(pubkey_bytes)
 }
 
+pub fn sign_message(crypto_pair: CryptographicSignature, message: [u8; 1024]) -> [u8; 1024] {
+   let digest = Sha256::digest(&message[0..992]);
+   let str = hex::encode(digest);
+   let signature = crypto_pair.priv_key.sign_prehash_recoverable(str.as_bytes());
+   let mut signed_message = [0;1024];
+   signed_message[..992].copy_from_slice(&message[..992]);
+   match signature {
+        Ok(signature) => {
+            println!("Signature: {:?}", signature);
+            let r = signature.0.r();
+    
+            let r_bytes = r.to_bytes(); // Returns a GenericArray/bytes object
+
+            signed_message[992..].copy_from_slice(&r_bytes[..32]);
+            signed_message
+        },
+        Err(e) => {
+            panic!("error");
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     // Note this useful idiom: importing names from outer (for mod tests) scope.
     use super::*;
 
-    #[test]
+    /*#[test]
     fn creating_cryptographic_signature() {
         let username = String::from("quoicoubeh");
         let crypto_pair = CryptographicSignature::new(username);
         let formatted_pubkey =formatPubKey(crypto_pair);
         println!("pubkey : {}",formatted_pubkey);
+    }*/
+
+    #[test]
+    fn signing_message() {
+        let username = String::from("quoicoubeh");
+        let crypto_pair = CryptographicSignature::new(username);
+        let username_b = String::from("quoicoubeh");
+        let handshake = HandshakeMessage::hello(0, 12, username_b);
+        let ser = handshake.serialize();
+        let signed_message = sign_message(crypto_pair, ser);
+        println!("unsigned_message: {:?}", ser);
+        println!("signed_message: {:?}", signed_message);
     }
+
+
 }

client-network/src/messages_structure.rs

@@ -1,50 +1,130 @@
-struct UDPMessage {
+pub struct UDPMessage {
-    id: [u8; 4],
+    id: u32,
     msg_type: u8,
-    length: [u8; 2],
+    length: u16,
     body: [u8; 985],
     signature: [u8; 32],
 }
 
-struct HandshakeMessage {
+pub struct HandshakeMessage {
-    id: [u8; 4],
+    id: u32,
     msg_type: u8,
-    length: [u8; 2],
+    length: u16,
-    extensions: [u8; 4],
+    extensions: u32,
     name: [u8; 981],
     signature: [u8; 32],
 }
 
 impl UDPMessage {
-    pub fn ping(id: i32) -> UDPMessage {
+    pub fn ping(id: u32) -> UDPMessage {
-        UDPMessage { id: id.to_ne_bytes(), msg_type: 0, length: [0; 2], body: [0; 985], signature: [0; 32]}
+        UDPMessage { id: id, msg_type: 0, length: 0, body: [0; 985], signature: [0; 32]}
     }
 
-    pub fn error(id: i32) -> UDPMessage {
+    pub fn error(id: u32) -> UDPMessage {
         
-        UDPMessage { id: id.to_ne_bytes(), msg_type: 129, length: [0; 2], body: [0; 985], signature: [0; 32]}
+        UDPMessage { id: id, msg_type: 129, length: 0, body: [0; 985], signature: [0; 32]}
+    }
 }
 
-    pub fn hello(id: i32, length: i16, username: String) -> HandshakeMessage {
+impl HandshakeMessage {
+    pub fn display(&self) {
+        println!("ID: {:?}", self.id);
+        println!("Message Type: {}", self.msg_type);
+        println!("Length: {:?}", self.length);
+        println!("extensions: {:?}", self.extensions);
+        let good_length = usize::min(self.length as usize, 981);
+        println!("name: {:?}", &self.name[..good_length]);
+        println!("Signature: {:?}", self.signature);
+    }
+    pub fn hello(id: u32, length: u16, username: String) -> HandshakeMessage {
         let username_bytes = username.as_bytes();
     
-        let mut body: [u8; 981] = [0; 981];
+        let mut name: [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]);
+        name[..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]}
+        HandshakeMessage {id: id, msg_type: 1, length: length, extensions: 0, name: name, signature: [0;32]}
 
     }
 
-    pub fn helloReply(id: i32, length: i16, username: String) -> HandshakeMessage {
+    pub fn helloReply(id: u32, length: u16, username: String) -> HandshakeMessage {
         let username_bytes = username.as_bytes();
     
-        let mut body: [u8; 981] = [0; 981];
+        let mut name: [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]);
+        name[..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]}
+        HandshakeMessage {id: id, msg_type: 130, length: length, extensions: 0, name: name, signature: [0;32]}
 
     }
+
+    pub fn serialize(&self) -> [u8; 1024] {
+        let mut buffer = [0u8; 1024];
+    let mut offset = 0;
+
+    buffer[offset..offset + 4].copy_from_slice(&self.id.to_be_bytes());
+    offset += 4;
+
+    buffer[offset] = self.msg_type;
+    offset += 1;
+
+    buffer[offset..offset + 2].copy_from_slice(&self.length.to_be_bytes());
+    offset += 2;
+
+    buffer[offset..offset + 4].copy_from_slice(&self.extensions.to_be_bytes());
+    offset += 4;
+
+    buffer[offset..offset + 981].copy_from_slice(&self.name);
+    offset += 981;
+
+    buffer[offset..offset + 32].copy_from_slice(&self.signature);
+    
+    buffer
+    }
+
+    pub fn parse(received_message: [u8; 1024]) -> HandshakeMessage {
+        let id_bytes: [u8; 4] = received_message[0..4].try_into().expect("Taille incorrecte");
+        let length_bytes: [u8; 2] = received_message[5..7].try_into().expect("Taille incorrecte");
+        let extensions_bytes: [u8; 4] = received_message[7..11].try_into().expect("Taille incorrecte");
+        let name_bytes: [u8; 981] = received_message[11..992].try_into().expect("Taille incorrecte");
+        let signature_bytes: [u8; 32] = received_message[992..1024].try_into().expect("Taille incorrecte");
+        HandshakeMessage {
+            id: u32::from_be_bytes(id_bytes),
+            msg_type: received_message[4],
+            length: u16::from_be_bytes(length_bytes),
+            extensions: u32::from_be_bytes(extensions_bytes),
+            name: name_bytes,
+            signature: signature_bytes,
+        }
+    }
+}
+
+fn convert_to_u16(bytes: [u8; 2]) -> u16 {
+    ((bytes[0] as u16) << 8) | (bytes[1] as u16)
+}
+
+
+
+#[cfg(test)]
+mod tests {
+    // Note this useful idiom: importing names from outer (for mod tests) scope.
+    use super::*;
+
+    /*#[tokio::test]
+    async fn creating_cryptographic_signature() {
+        let username = String::from("charlie_kirk");
+        let handshake = HandshakeMessage::hello(0, 12, username);
+        handshake.display();
+    }*/
+    
+    /*#[tokio::test]
+    async fn parse_handshakemessage() {
+        let username = String::from("charlie_kirk");
+        let handshake = HandshakeMessage::hello(0, 12, username);
+        let ser = handshake.serialize();
+        let parsed = HandshakeMessage::parse(ser);
+        handshake.display();
+        parsed.display();
+    }*/
 }
 

client-network/src/registration.rs

@@ -1,4 +1,5 @@
-use crate::cryptographic_signature::{CryptographicSignature, formatPubKey};
+use crate::cryptographic_signature::{CryptographicSignature, formatPubKey, sign_message};
+use crate::messages_structure::HandshakeMessage;
 use std::net::UdpSocket;
 ///
 /// Registration with the server happens in two steps: first, the client
@@ -30,8 +31,16 @@ async fn register_with_the_server(crypto_pair: CryptographicSignature) -> Result
 /// to receive requests by sending a Hello request to the client. If the client doesn’t reply to the Hello
 /// request with a properly signed message, its address will not be published by the server.
 fn register_ip_addresses(crypto_pair: CryptographicSignature) {
-   let socket = UdpSocket::bind("127.0.0.1:4242");  
+    let socket = UdpSocket::bind("127.0.0.1:4242").expect("bind failed"); 
-   //TODO
+    let username_size = crypto_pair.username.len();
+    let hello_handshake = HandshakeMessage::hello(0, username_size as u16, crypto_pair.username.clone()); 
+    let hello_handshake_serialized = hello_handshake.serialize();
+    let message_signed = sign_message(crypto_pair, hello_handshake_serialized); 
+    socket.send_to(&message_signed, "jch.irif.fr:8443").expect("send failed");
+    let mut buf = [0u8; 1024];
+    socket.recv_from(&mut buf).expect("receive failed");
+    let hello_handshake_received = HandshakeMessage::parse(buf);
+    hello_handshake_received.display();
 }
 
 #[cfg(test)]
@@ -39,12 +48,12 @@ mod tests {
     // Note this useful idiom: importing names from outer (for mod tests) scope.
     use super::*;
 
-    #[tokio::test]
+    /*#[tokio::test]
     async fn creating_cryptographic_signature() {
         let username = String::from("charlie_kirk");
         let crypto_pair = CryptographicSignature::new(username);
     if let Err(e) = register_with_the_server(crypto_pair).await {
         eprintln!("Error during registration: {}", e);
     }
-    }
+    }*/
 }

todo.md

@@ -31,3 +31,5 @@ rechercher les fichiers d'un pair
 telechargement des fichiers
 choisir un dossier à partager
 se deconnecter du réseau
+
+2 channels -> un pour envoyer et un pour recevoir