recvice implementiert.

src/bin/client.rs

@@ -1,12 +1,12 @@
-use std::io::Write;
-use std::net::TcpStream;
 use crypto_box::{
     aead::{Aead, AeadCore, OsRng},
-    SalsaBox, PublicKey, SecretKey
+    PublicKey, SalsaBox, SecretKey,
 };
+use std::io::Write;
+use std::net::TcpStream;
 
 fn main() {
-    let port: u32 = 7878;
+    let port: u32 = 7878; // Port Server
                           //let stream = TcpStream::connect("172.30.16.1:8080");
                           //let stream = TcpStream::connect("27.0.0.1:8080");
     match TcpStream::connect(format!("localhost:{}", port)) {
@@ -14,12 +14,21 @@ fn main() {
             println!("Successfully connected to server");
 
             let bob_init_pub_key = PublicKey::from([
-                0xe8, 0x98, 0xc, 0x86, 0xe0, 0x32, 0xf1, 0xeb,
-                0x29, 0x75, 0x5, 0x2e, 0x8d, 0x65, 0xbd, 0xdd,
-                0x15, 0xc3, 0xb5, 0x96, 0x41, 0x17, 0x4e, 0xc9,
-                0x67, 0x8a, 0x53, 0x78, 0x9d, 0x92, 0xc7, 0x54,
+                0xe8, 0x98, 0xc, 0x86, 0xe0, 0x32, 0xf1, 0xeb, 0x29, 0x75, 0x5, 0x2e, 0x8d, 0x65,
+                0xbd, 0xdd, 0x15, 0xc3, 0xb5, 0x96, 0x41, 0x17, 0x4e, 0xc9, 0x67, 0x8a, 0x53, 0x78,
+                0x9d, 0x92, 0xc7, 0x54,
             ]);
-            let (salsa_box, pub_key) = generate_box(bob_init_pub_key.clone());
+
+            // Generate a random secret key.
+            // NOTE: The secret key bytes can be accessed by calling `secret_key.as_bytes()`
+            let own_secret_key = SecretKey::generate(&mut OsRng);
+
+            // Get the public key for the secret key we just generated
+            let own_public_key = own_secret_key.public_key().clone();
+
+            // Create a `SalsaBox` by performing Diffie-Hellman key agreement between
+            // the two keys.
+            let salsa_box = SalsaBox::new(&bob_init_pub_key, &own_secret_key);
 
             loop {
                 let mut buffer = String::new();
@@ -49,11 +58,16 @@ fn main() {
                         //
 
                         // Decrypt the message, using the same randomly generated nonce
-                        let decrypted_plaintext = salsa_box.decrypt(&nonce, &ciphertext[..]).expect("Fehler");
-                        let dec_plain_plaintext = std::str::from_utf8(&*decrypted_plaintext).expect("Nö");
+                        let decrypted_plaintext =
+                            salsa_box.decrypt(&nonce, &ciphertext[..]).expect("Fehler");
+                        let dec_plain_plaintext =
+                            std::str::from_utf8(&*decrypted_plaintext).expect("Nö");
                         assert_eq!(&plaintext[..], &decrypted_plaintext[..]);
 
-                        println!("Sent {0:?} as cypher: {1:?}, decrypted: {2:?}, {3}", plaintext, ciphertext, decrypted_plaintext, dec_plain_plaintext);
+                        println!(
+                            "Sent {0:?} as cypher: {1:?}, decrypted: {2:?}, {3}",
+                            plaintext, ciphertext, decrypted_plaintext, dec_plain_plaintext
+                        );
                     }
                     Err(error) => {
                         println!("error: {error}");
@@ -82,4 +96,3 @@ fn generate_box(partner_public_key: PublicKey) -> (SalsaBox, PublicKey) {
     let salsa_box = SalsaBox::new(&partner_public_key, &own_secret_key);
     (salsa_box, own_public_key)
 }
-

src/bin/constants.rs

@@ -0,0 +1,2 @@
+pub const KEYBYTE: u8 = 0b1;
+pub const MSGBYTE: u8 = 0b01;

src/bin/message.rs

@@ -0,0 +1,75 @@
+const KEYLENGTH: u8 = 32;
+
+pub enum PayloadType {
+    //0-31 system messages (plaintext)
+    Ping = 1,
+    Pong = 2,
+    Error = 3,
+    //32 - 63 Serverside messages (currently plaintext)
+    Init = 32,
+    Join = 33,
+    Exit = 34,
+    //64 -95 initial setup messages(plaintext)
+    DhSetup = 64,
+    DhReturn = 65,
+    //96 - 127 client-client setup messages(DH or old KEY encrypted)
+    AUTHORIZE = 96,
+    KeyCurrent = 97,
+    KeyNew = 98,
+    //128-159 main messages (shared KEY encrypted)
+    Msg = 128,
+    //160-255 reserved
+}
+
+struct Message {
+    // Eigenschaften der Klasse
+    src_id: u32,
+    dest_id: u32,
+    size: u16,
+    payload: Vec<u8>,
+}
+
+impl Message {
+    fn new(src_id: u32, dest_id: u32, size: u16, msg_type: PayloadType) -> Message {
+        let mut msg = Message {
+            src_id: src_id,
+            dest_id: dest_id,
+            size: size,
+            payload: Vec::with_capacity(size.into()),
+        };
+        msg.payload[0] = msg_type as u8;
+        msg
+    }
+
+    fn recive(input: Vec<u8>) -> Message {
+        let byte1 = input.get(0).expect("Fail to Read Byte 1");
+        let byte2 = input.get(1).expect("Fail to Read Byte 2");
+        let byte3 = input.get(2).expect("Fail to Read Byte 3");
+        let byte4 = input.get(3).expect("Fail to Read Byte 4");
+
+        let src_id: u32 =
+            (byte1 << 24) as u32 | (byte2 << 16) as u32 | (byte3 << 8) as u32 | (byte4 << 0) as u32;
+
+        let byte5 = input.get(5).expect("Fail to Read Byte 5");
+        let byte6 = input.get(6).expect("Fail to Read Byte 6");
+        let byte7 = input.get(7).expect("Fail to Read Byte 7");
+        let byte8 = input.get(8).expect("Fail to Read Byte 8");
+
+        let dest_id: u32 =
+            (byte5 << 24) as u32 | (byte6 << 16) as u32 | (byte7 << 8) as u32 | (byte8 << 0) as u32;
+
+        let byte9 = input.get(9).expect("Fail to Read byte 9");
+        let byte10 = input.get(10).expect("Fail to Read byte 10");
+
+        let size = (byte9 << 8) as u16 | (byte10 << 0) as u16;
+        assert!(size > 0, "Ungültige size größe size = {}", size);
+
+        Message {
+            src_id: src_id,
+            dest_id: dest_id,
+            size: size,
+            payload: (&input[11..]).to_vec(),
+        }
+    }
+    // Methoden der Klasse
+}