Starting work on brand new patcher (Wooo)

Oh god my sanity is fading again. Please help. oh god. oh god. oh god. Please help me.

src-tauri/src/main.rs

@@ -19,6 +19,7 @@ mod downloader;
 mod lang;
 mod proxy;
 mod web;
+mod metadata;
 
 lazy_static! {
   static ref WATCH_GAME_PROCESS: Mutex<String> = {
@@ -62,7 +63,8 @@ fn main() {
       downloader::stop_download,
       lang::get_lang,
       lang::get_languages,
-      web::valid_url
+      web::valid_url,
+      metadata::patch_metadata
     ])
     .run(tauri::generate_context!())
     .expect("error while running tauri application");

src-tauri/src/metadata.rs

@@ -0,0 +1,129 @@
+use core::ffi::c_void;
+use std::fs::File;
+use std::io::Read;
+use std::io::Write;
+use libloading::os::windows::Library;
+use libloading::os::windows::Symbol;
+use regex::Regex;
+
+fn dll_decrypt_global_metadata(data : *mut u8, size : u64) -> Result<*const c_void, Box<dyn std::error::Error>> {
+  unsafe {
+    // Load DLL
+    let lib = Library::new("mhycrypto.dll")?;
+
+    // Load function and call it
+    let func : Symbol<unsafe extern fn(*mut u8, u64) -> *const c_void> = lib.get_ordinal(0x1)?;
+    let decrypted_data = func(data, size);
+
+    // Close DLL and return result
+    lib.close()?;
+    Ok(decrypted_data)
+  }
+}
+
+fn dll_encrypt_global_metadata(data : *mut u8, size : u64) -> Result<*const c_void, Box<dyn std::error::Error>> {
+  unsafe {
+    // Load DLL
+    let lib = Library::new("mhycrypto.dll")?;
+
+    // Load function and call it
+    let func : Symbol<unsafe extern fn(*mut u8, u64) -> *const c_void> = lib.get_ordinal(0x2)?;
+    let encrypted_data = func(data, size);
+
+    // Close DLL and return result
+    lib.close()?;
+    Ok(encrypted_data)
+  }
+}
+
+#[tauri::command]
+pub fn patch_metadata(metadata_folder: &str) {
+  let metadata_file = &(metadata_folder.to_owned() + "\\global-metadata.dat");
+  println!("Patching metadata file: {}", metadata_file);
+  let decrypted : Vec<u8> = decrypt_metadata(metadata_file);
+
+  //write decrypted to file
+  let mut file = File::create(&(metadata_folder.to_owned() + "\\decrypted-metadata.dat")).unwrap();
+  file.write_all(&decrypted).unwrap();
+
+  replace_rsa_key(&decrypted);
+
+  /*if decrypted != Vec::new() {
+    
+  } else {
+    // error
+  }*/
+}
+
+fn decrypt_metadata(file_path: &str) -> Vec<u8>{
+  let mut file = match File::open(file_path) {
+    Ok(file) => file,
+    Err(e) => {
+      println!("Failed to open global-metadata: {}", e);
+      return Vec::new();
+    }
+  };
+  let mut data = Vec::new();
+  match file.read_to_end(&mut data) {
+    Ok(_) => {
+      match dll_decrypt_global_metadata(data.as_mut_ptr(), data.len().try_into().unwrap()) {
+        Ok(_) => {
+          println!("Successfully decrypted global-metadata");
+          return data;
+        }
+        Err(e) => {
+          println!("Failed to decrypt global-metadata: {}", e);
+          return Vec::new();
+        }
+      };
+    }
+    Err(e) => {
+      println!("Failed to read global-metadata: {}", e);
+      return Vec::new();
+    }
+  }
+}
+
+fn replace_rsa_key(data: &Vec<u8>) {
+  unsafe {
+    let data_str = String::from_utf8_unchecked(data.to_vec());
+
+    let re = Regex::new(r"<RSAKeyValue>((.|\n|\r)*?)</RSAKeyValue>").unwrap();
+    let matches = re.find_iter(&data_str);
+
+    // dispatch key is index 3
+    // password key is index 2
+
+    //println!("Found {} RSA Key(s)", matches.count());
+    for (i, rmatch) in matches.enumerate() {
+      let key = rmatch.as_str();
+
+      println!("{} - RSA Key {}", i, key);
+      println!("\n");
+    }
+  }
+
+  
+
+  /*if matches.count() < 1 {
+    println!("No RSA keys found");
+    return Vec::new();
+  }*/
+}
+
+/*let mut file = match OpenOptions::new().write(true).create(true).open(&(file_location.to_owned() + "\\decrypted_metadata.dat")) {
+        Ok(file) => file,
+        Err(e) => {
+          println!("Failed to open file: {}", e);
+          return;
+        }
+      };
+      match file.write_all(&data) {
+        Ok(_) => {
+          println!("Successfully decrypted metadata");
+        }
+        Err(e) => {
+          println!("Failed to write to file: {}", e);
+          return;
+        }
+      }*/