sha3 -> crc32

serve missing packet requests in rust server

rust/client/src/big_array.rs

@@ -63,6 +63,6 @@ macro_rules! big_array {
 }
 
 big_array! {
-    40, 48, 50, 56, 64, 72, 96, 100, 128, 160, 192, 200, 224, 256, 384, 488, 512,
+    40, 48, 50, 56, 64, 72, 96, 100, 128, 160, 192, 200, 224, 256, 384, 488, 500, 512,
     768, 1024, 2048, 4096, 8192, 16384, 32768, 65536,
 }

rust/client/src/main.rs

@@ -1,16 +1,16 @@
 use bincode::{self, Error, options, Options};
 use std::{net::{UdpSocket, SocketAddr}, io::Write};
 use serde::{Serialize, Deserialize};
-use sha3::{Digest, Sha3_512};
-use sha2::Sha512;
+use sha2::{Digest, Sha512};
 use std::io::{self, BufRead};
+use crc32fast;
 
 mod big_array;
 use big_array::BigArray;
 
 const MAX_FRAME_PAYLOAD:u16=508;
 const MAX_FRAME_PAYLOAD_U:usize=MAX_FRAME_PAYLOAD as usize;
-const HEADER_SIZE:u16 = 20;
+const HEADER_SIZE:u16 = 8;
 const MAX_PAYLOAD:u16 = MAX_FRAME_PAYLOAD - HEADER_SIZE;
 const MAX_PAYLOAD_U:usize = MAX_PAYLOAD as usize;
 
@@ -24,10 +24,10 @@ struct PacketInformation {
 #[derive(Serialize, Deserialize)]
 struct Packet {
     packet_number: u32, //4 bytes
-    payload_hash: [u8; 16], //16 bytes
+    payload_hash: [u8; 4], //4 bytes
     #[serde(with = "BigArray")]
-    payload: [u8; MAX_PAYLOAD_U], //488 bytes
-} //512 bytes
+    payload: [u8; MAX_PAYLOAD_U],
+} //508 bytes
 
 fn read_stdin(message: String) -> String {
     print!("{}", message);
@@ -150,11 +150,9 @@ fn main() {
                     //println!("Packet {}", p.packet_number);
                     //check checksum with sum
                     if p.packet_number != packet_info.packet_numbers - 1 {
-                        let mut hasher = Sha3_512::new();
-                        hasher.update(&p.payload);
-                        let hash = hasher.finalize();
+                        let hash = crc32fast::hash(&p.payload);
 
-                        if p.payload_hash != hash[..16] {
+                        if p.payload_hash != hash.to_be_bytes() {
                             continue;
                         }