From bf24fae0f8b800e3802b8dfae875c5c1668ef2a1 Mon Sep 17 00:00:00 2001
From: Dohyeon An <gomsoup@gmail.com>
Date: Thu, 17 Mar 2022 09:00:17 +0900
Subject: [PATCH] Unencrypted save file support

---
 BinderTool.Core/Sl2/Sl2UserData.cs | 18 ++++++++++++++----
 BinderTool/Program.cs              |  2 +-
 2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/BinderTool.Core/Sl2/Sl2UserData.cs b/BinderTool.Core/Sl2/Sl2UserData.cs
index 167bf11..678cc45 100644
--- a/BinderTool.Core/Sl2/Sl2UserData.cs
+++ b/BinderTool.Core/Sl2/Sl2UserData.cs
@@ -1,4 +1,5 @@
-using System.IO;
+using System;
+using System.IO;
 using System.Text;
 
 namespace BinderTool.Core.Sl2
@@ -6,24 +7,33 @@ namespace BinderTool.Core.Sl2
     public class Sl2UserData
     {
         private const int UserDataIvSize = 16;
-        
+
         private readonly byte[] _key;
 
         private readonly byte[] _iv;
 
+        private readonly bool _encrypted;
+
         public Sl2UserData(byte[] key)
         {
             _key = key;
             _iv = new byte[UserDataIvSize];
+            _encrypted = Equals(key, new byte[key.Length]) ? true : false;
         }
 
         public string Name { get; set; }
 
         public byte[] EncryptedUserData { get; private set; }
 
-        //public byte[] DecryptedUserData => CryptographyUtility.DecryptAesCbc(new MemoryStream(EncryptedUserData), _key, _iv).ToArray();
-        public byte[] DecryptedUserData => null;
+        public byte[] DecryptedUserData()
+        {
+            if (!_encrypted)
+                return EncryptedUserData;
 
+            MemoryStream ms = new MemoryStream();
+            CryptographyUtility.DecryptAesCbc(new MemoryStream(EncryptedUserData), _key, _iv).CopyTo(ms);
+            return ms.ToArray();
+        }
 
         public static Sl2UserData ReadSl2UserData(Stream inputStream, byte[] key, int size, string name)
         {
diff --git a/BinderTool/Program.cs b/BinderTool/Program.cs
index e26e9f0..b27c190 100644
--- a/BinderTool/Program.cs
+++ b/BinderTool/Program.cs
@@ -596,7 +596,7 @@ private static void UnpackSl2File(Options options)
                 foreach (var userData in sl2File.UserData)
                 {
                     string outputFilePath = Path.Combine(options.OutputPath, userData.Name);
-                    File.WriteAllBytes(outputFilePath, userData.DecryptedUserData);
+                    File.WriteAllBytes(outputFilePath, userData.DecryptedUserData());
                 }
             }
         }