New game entries.

2023-01-15 17:11:32 +04:00
parent 217965745c
commit d768e85916
5 changed files with 141 additions and 11 deletions
--- a/AssetStudio/Crypto/OPFPUtils.cs
+++ b/AssetStudio/Crypto/OPFPUtils.cs
@@ -0,0 +1,40 @@
+using System;
+
+namespace AssetStudio
+{
+    public static class OPFPUtils
+    {
+        public static readonly string[] EncrytpedFolders = { "UI/", "Atlas/", "UITexture/", "DynamicAtlas/" };
+
+        public static void Decrypt(Span<byte> data, string path)
+        {
+            if (IsEncryptionBundle(path, out var key))
+            {
+                data[0] ^= key;
+                for (int i = 1; i < data.Length; i++)
+                {
+                    data[i] ^= data[i - 1];
+                }
+            }
+        }
+        private static bool IsEncryptionBundle(string path, out byte key) 
+        {
+            path = path.Replace("\\", "/");
+            foreach(var encryptedFolder in EncrytpedFolders)
+            {
+                var index = path.IndexOf(encryptedFolder, 0, path.Length, StringComparison.OrdinalIgnoreCase);
+                if (index != -1)
+                {
+                    var assetPath = path[index..];
+                    if (assetPath.StartsWith(encryptedFolder, StringComparison.OrdinalIgnoreCase))
+                    {
+                        key = (byte)assetPath.Length;
+                        return true;
+                    }
+                }
+            }
+            key = 0x00;
+            return false;
+        }
+    }
+}