respond to data packets immediately even if they are out of order

prudpv1/src/prudp/socket.rs

@@ -558,6 +558,14 @@ impl<T: CryptoHandler> InternalSocket<T> {
 
         let mut conn = conn.lock().await;
 
+        let mut response = packet.base_acknowledgement_packet();
+        response.header.types_and_flags.set_flag(HAS_SIZE | ACK);
+        response.header.session_id = conn.session_id;
+
+        conn.crypto_handler_instance.sign_packet(&mut response);
+
+        self.send_packet_unbuffered(address, &response).await;
+
         conn.packet_queue.insert(packet.header.sequence_id, packet);
 
         let mut counter = conn.reliable_client_counter;
@@ -566,14 +574,6 @@ impl<T: CryptoHandler> InternalSocket<T> {
             conn.crypto_handler_instance
                 .decrypt_incoming(packet.header.substream_id, &mut packet.payload[..]);
 
-            let mut response = packet.base_acknowledgement_packet();
-            response.header.types_and_flags.set_flag(HAS_SIZE | ACK);
-            response.header.session_id = conn.session_id;
-
-            conn.crypto_handler_instance.sign_packet(&mut response);
-
-            self.send_packet_unbuffered(address, &response).await;
-
             conn.data_sender.send(packet.payload).await.ok();
 
             conn.reliable_client_counter = conn.reliable_client_counter.overflowing_add(1).0;

rnex-core/src/kerberos/mod.rs

@@ -232,3 +232,31 @@ mod test {
         assert_eq!(KerberosDateTime::PRACTICALLY_NEVER, time)
     }
 }
+
+#[test]
+fn test() {
+    let key = *b"my password";
+    let nkey = hex::decode("c3ef03044c6937d30e6b179f610ea190").unwrap();
+
+    let mut key: [u8; 16] = {
+        let mut md5 = Md5::new();
+        md5.update(key);
+        md5.finalize().try_into().unwrap()
+    };
+
+    loop {
+        if &nkey[..] == &key[..] {
+            println!("success");
+            return;
+        }
+        let mut md5 = Md5::new();
+        md5.update(key);
+        key = md5.finalize().try_into().unwrap();
+    }
+}
+
+struct NexToken {
+    pub pid: u32,
+    pub time: u64,
+    pub pw_hash: [u8; 4],
+}