From f1ea41a2c7c724609edee398437fb46093ecbdc7 Mon Sep 17 00:00:00 2001
From: Razmoth <32140579+Razmoth@users.noreply.github.com>
Date: Tue, 26 Sep 2023 10:29:17 +0400
Subject: [PATCH] - [Core] Added new entry (#23)

---
 AssetStudio/FileReader.cs   |  3 +++
 AssetStudio/GameManager.cs  |  4 +++-
 AssetStudio/ImportHelper.cs | 33 +++++++++++++++++++++++++++++++++
 3 files changed, 39 insertions(+), 1 deletion(-)

diff --git a/AssetStudio/FileReader.cs b/AssetStudio/FileReader.cs
index 1c71473..d566aed 100644
--- a/AssetStudio/FileReader.cs
+++ b/AssetStudio/FileReader.cs
@@ -203,6 +203,9 @@ namespace AssetStudio
                     case GameType.ProjectSekai:
                         reader = DecryptProjectSekai(reader);
                         break;
+                    case GameType.CodenameJump:
+                        reader = DecryptCodenameJump(reader);
+                        break;
                 }
             }
             if (reader.FileType == FileType.BundleFile && game.Type.IsBlockFile() || reader.FileType == FileType.ENCRFile || reader.FileType == FileType.BlbFile)
diff --git a/AssetStudio/GameManager.cs b/AssetStudio/GameManager.cs
index a5866e2..8eebba1 100644
--- a/AssetStudio/GameManager.cs
+++ b/AssetStudio/GameManager.cs
@@ -38,6 +38,7 @@ namespace AssetStudio
             Games.Add(index++, new Game(GameType.ImaginaryFest));
             Games.Add(index++, new Game(GameType.AliceGearAegis));
             Games.Add(index++, new Game(GameType.ProjectSekai));
+            Games.Add(index++, new Game(GameType.CodenameJump));
         }
         public static Game GetGame(GameType gameType) => GetGame((int)gameType);
         public static Game GetGame(int index)
@@ -146,7 +147,8 @@ namespace AssetStudio
         DreamscapeAlbireo,
         ImaginaryFest,
         AliceGearAegis,
-        ProjectSekai
+        ProjectSekai,
+        CodenameJump
     }
 
     public static class GameTypes
diff --git a/AssetStudio/ImportHelper.cs b/AssetStudio/ImportHelper.cs
index 740d7ad..6b8f2cc 100644
--- a/AssetStudio/ImportHelper.cs
+++ b/AssetStudio/ImportHelper.cs
@@ -836,5 +836,38 @@ namespace AssetStudio
             ms.Position = 0;
             return new FileReader(reader.FullPath, ms);
         }
+        
+        public static FileReader DecryptCodenameJump(FileReader reader)
+        {
+            Logger.Verbose($"Attempting to decrypt file {reader.FileName} with Codename Jump encryption");
+
+            var key = new byte[] { 0x6B, 0xC9, 0xAC, 0x0E, 0xE7, 0xD2, 0xB1, 0x99, 0x39, 0x59, 0x26, 0x56, 0x1B, 0x6C, 0xBB, 0xA4, 0x83, 0xC8, 0x79, 0x2E, 0x4B, 0xB2, 0x9D, 0x69, 0x35, 0xB8, 0x9A, 0xD6, 0xD5, 0x63, 0x95, 0x20, 0x14, 0x82, 0x1C, 0x7C, 0xD4, 0xA9, 0x15, 0x56, 0xC3, 0xC5, 0xD7, 0x21, 0x03, 0x4E, 0x4A, 0x34, 0x6B, 0x05, 0x2D, 0x0B, 0xE2, 0x7D, 0x7D, 0xD7, 0xB2, 0xAE, 0x9E, 0x56, 0x91, 0xBA, 0x81, 0x81, 0x0E, 0x08, 0x4D, 0xA0, 0x09, 0xB5, 0x60, 0x74, 0x58, 0x36, 0x89, 0x09, 0x19, 0x2C, 0x10, 0xB1, 0xD0, 0xA3, 0x4C, 0x36, 0xAA, 0x95, 0xBC, 0x10, 0x39, 0x30, 0x93, 0xE8, 0xAD, 0x38, 0x51, 0xAA, 0xCA, 0x08, 0x67, 0x03, 0x08, 0xD1, 0x20, 0x05, 0x27, 0x0B, 0x9D, 0xB1, 0x4B, 0x42, 0x98, 0x03, 0x5A, 0x49, 0x97, 0xB0, 0x2A, 0xB6, 0x3A, 0x2C, 0x33, 0xA3, 0x65, 0xC7, 0x7D, 0xB9, 0x41, 0xAD, 0xE7, 0x70, 0x59, 0x61, 0x82, 0x59, 0xC9, 0x5A, 0x0B, 0x13, 0x6D, 0x95, 0x31, 0x31, 0x23, 0x22, 0xD0, 0x51, 0x45, 0x59, 0x09, 0x57, 0xA2, 0x60, 0x3B, 0xCE, 0x9B, 0x6E, 0x22, 0x9E, 0x87, 0xBD, 0x83, 0x88, 0x73, 0xD0, 0x79, 0xD0, 0xAC, 0xDC, 0xE1, 0x6C, 0xB3, 0xA4, 0xCC, 0x98, 0x04, 0xE8, 0xB6, 0xBB, 0xAC, 0x21, 0xB9, 0x2A, 0x6E, 0x78, 0x01, 0xED, 0xC1, 0xA6, 0x79, 0xE0, 0x9B, 0x68, 0x7B, 0x8A, 0x25, 0xE4, 0x47, 0xBB, 0x5D, 0x2A, 0xC0, 0x5A, 0xDE, 0x31, 0xEC, 0x5C, 0xCE, 0x6D, 0xBE, 0x68, 0x1E, 0x93, 0x44, 0x89, 0x56, 0x68, 0x4C, 0x6E, 0xD0, 0x46, 0xB0, 0x97, 0xE4, 0x72, 0x23, 0xB5, 0x87, 0x18, 0xD5, 0x2D, 0xA9, 0x0E, 0x63, 0xAE, 0xCE, 0x4A, 0x69, 0xD0, 0xD1, 0x6B, 0xB0, 0x0C, 0x1A, 0xBD, 0xE3, 0x01, 0x45, 0x8B, 0x93, 0xD5, 0x83, 0x9C, 0xB7, 0x12, 0x6C, 0xD5 };
+
+            var signatureBytes = reader.ReadBytes(8);
+            reader.Position = 0;
+
+            for (int i = 0; i < signatureBytes.Length; i++)
+            {
+                signatureBytes[i] ^= key[i % key.Length];
+            }
+            var signature = Encoding.UTF8.GetString(signatureBytes[..7]);
+            if (signature != "UnityFS")
+            {
+                Logger.Verbose($"Unknown signature, exepcted UnityFS but got {signature} instead !!");
+                return reader;
+            }
+
+            var data = reader.ReadBytes((int)reader.Remaining);
+            for (int i = 0; i < data.Length; i++)
+            {
+                data[i] ^= key[i % key.Length];
+            }
+
+            Logger.Verbose("Decrypted Codename Jump file successfully !!");
+            MemoryStream ms = new();
+            ms.Write(data);
+            ms.Position = 0;
+            return new FileReader(reader.FullPath, ms);
+        }
     }
 }