sha3 -> crc32

serve missing packet requests in rust server

rust/client/Cargo.lock

@@ -41,6 +41,15 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "crc32fast"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b540bd8bc810d3885c6ea91e2018302f68baba2129ab3e88f32389ee9370880d"
+dependencies = [
+ "cfg-if",
+]
+
 [[package]]
 name = "crypto-common"
 version = "0.1.6"
@@ -77,18 +86,9 @@ version = "0.1.0"
 dependencies = [
  "bincode",
  "byteorder",
+ "crc32fast",
  "serde",
  "sha2",
- "sha3",
-]
-
-[[package]]
-name = "keccak"
-version = "0.1.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8f6d5ed8676d904364de097082f4e7d240b571b67989ced0240f08b7f966f940"
-dependencies = [
- "cpufeatures",
 ]
 
 [[package]]
@@ -146,16 +146,6 @@ dependencies = [
  "digest",
 ]
 
-[[package]]
-name = "sha3"
-version = "0.10.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "75872d278a8f37ef87fa0ddbda7802605cb18344497949862c0d4dcb291eba60"
-dependencies = [
- "digest",
- "keccak",
-]
-
 [[package]]
 name = "syn"
 version = "2.0.16"

rust/client/Cargo.toml

@@ -9,8 +9,8 @@ edition = "2021"
 bincode = "1.3.3"
 serde = { version = "1.0.163", features = ["serde_derive"], default-features = false }
 byteorder = { default-features = false, version = "1.4.3" }
-sha3 = { default-features = false, version = "0.10.8" }
 sha2 = { default-features = false, version = "0.10.6" }
+crc32fast = { default-features = false, version = "1.3.2" }
 
 [profile.release]
 lto = true          # Enable link-time optimization

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;
                         }