chenx221/Light.vnTools
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Update new encryption scheme & drop support for .NET 6.0

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Signed-off-by: Bayu Satiyo <itsyuukunz@gmail.com>
This commit is contained in:
Bayu Satiyo 2024-07-14 06:08:40 +07:00
parent ea9a31d407
commit deb757922c
No known key found for this signature in database
GPG Key ID: 3C98876626C85FE3
4 changed files with 112 additions and 66 deletions
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4
.vscode/launch.json vendored
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@ -10,7 +10,7 @@
"request": "launch",
"preLaunchTask": "build",
// If you have changed target frameworks, make sure to update the program path.
"program": "${workspaceFolder}/bin/Debug/net6.0/LightvnTools.dll",
"program": "${workspaceFolder}/bin/Debug/net8.0/LightvnTools.dll",
"args": [],
"cwd": "${workspaceFolder}",
// For more information about the 'console' field, see https://aka.ms/VSCode-CS-LaunchJson-Console
@ -23,4 +23,4 @@
"request": "attach"
}
]
}
}

150
Program.cs → LightvnTools.cs
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@ -3,14 +3,14 @@ using ICSharpCode.SharpZipLib.Zip;
namespace LightvnTools
{
public class Program
public class LightvnTools
{
static readonly string VERSION = "1.1.0";
static readonly string VERSION = "1.2.0";
// PKZip signature
static readonly byte[] PKZIP = { 0x50, 0x4B, 0x03, 0x04 };
// Key used to decrypt the file header and footer (reverse)
// Key used to XOR the file header and footer (reverse)
// Text: `d6c5fKI3GgBWpZF3Tz6ia3kF0`
// Source: https://github.com/morkt/GARbro/issues/440
static readonly byte[] KEY = { 0x64, 0x36, 0x63, 0x35, 0x66, 0x4B, 0x49, 0x33, 0x47, 0x67, 0x42, 0x57, 0x70, 0x5A, 0x46, 0x33, 0x54, 0x7A, 0x36, 0x69, 0x61, 0x33, 0x6B, 0x46, 0x30 };
@ -23,26 +23,65 @@ namespace LightvnTools
Console.WriteLine($"Light.vnTools v{VERSION}");
Console.WriteLine();
Console.WriteLine(
"Light.vnTools is an unpack and repacking tool for Light.vn game engine (lightvn.net)."
"Light.vnTools is an unpack and repacking tool for game made with Light.vn game engine (lightvn.net)."
);
Console.WriteLine();
Console.WriteLine("Usage:");
Console.WriteLine(" Unpack: Drag and drop '.vndat' file to 'LightvnTools.exe'");
Console.WriteLine(" Unpack: Drag and drop '.vndat' / '.mcdat' file(s) to 'LightvnTools.exe'");
Console.WriteLine(" Repack: Drag and drop unpacked folder to 'LightvnTools.exe'");
Console.ReadLine();
Console.ReadKey();
return;
}
string input = args[0];
string zipPassword = Encoding.UTF8.GetString(KEY);
if (File.Exists(input))
Unpack(input, Path.GetFileNameWithoutExtension(input), zipPassword);
for (int i = 0; i < args.Length; i++)
{
if (File.Exists(args[i]))
{
if (IsVndat(args[i]))
{
UnpackVndat(args[i], Path.GetFileNameWithoutExtension(args[i]), zipPassword);
}
else if (Path.GetExtension(args[i]).Contains("mcdat"))
{
Console.WriteLine($"Decrypting {args[i]}...");
XOR(args[i], $"{args[i]}.dec");
}
else if (Path.GetExtension(args[i]).Contains("dec"))
{
Console.WriteLine($"Encrypting {args[i]}...");
XOR(args[i], args[i].Replace("dec", "enc"));
}
else
{
Console.WriteLine($"Unsupported file! {args[i]}");
break;
}
}
if (Directory.Exists(input))
Repack(input, zipPassword);
if (Directory.Exists(args[i]))
{
RepackVndat(args[i], zipPassword);
GetFilesRecursive(args[i]).ToList().ForEach(path =>
{
if (path.Contains("mcdat"))
{
Console.WriteLine($"Decrypting {path}...");
XOR(path, $"{path}.dec");
}
else if (path.Contains("dec"))
{
Console.WriteLine($"Encrypting {path}...");
XOR(path, path.Replace("dec", "enc"));
}
});
}
}
Console.ReadLine();
Console.WriteLine("\nDone.");
Console.ReadKey();
return;
}
/// <summary>
@ -51,14 +90,8 @@ namespace LightvnTools
/// <param name="vndatFile"></param>
/// <param name="outputFolder"></param>
/// <param name="password"></param>
static void Unpack(string vndatFile, string outputFolder, string? password = "")
static void UnpackVndat(string vndatFile, string outputFolder, string? password = "")
{
if (!IsVndat(vndatFile))
{
Console.WriteLine($"{Path.GetFileName(vndatFile)} isn\'t a `.vndat` (zip) file!");
return;
}
bool usePassword = IsPasswordProtectedZip(vndatFile);
using ZipFile zipFile = new(vndatFile);
@ -100,7 +133,7 @@ namespace LightvnTools
Console.WriteLine("Done.");
}
// Only XOR `.vndat` contents that's not password protected.
// Only XOR the `.vndat` contents if the archive is not password protected.
if (!usePassword)
{
string[] files = GetFilesRecursive(outputFolder);
@ -109,8 +142,8 @@ namespace LightvnTools
{
foreach (string file in files)
{
Console.WriteLine($"Decrypting {file}...");
XorVndatContent(file);
Console.WriteLine($"XORing {file}...");
XOR(file);
}
Console.WriteLine("Done.");
@ -123,7 +156,7 @@ namespace LightvnTools
/// </summary>
/// <param name="sourceFolder"></param>
/// <param name="password"></param>
static void Repack(string sourceFolder, string? password = "")
static void RepackVndat(string sourceFolder, string? password = "")
{
string outputFile = $"{Path.GetFileName(sourceFolder)}.vndat";
string[] files = GetFilesRecursive(sourceFolder);
@ -158,7 +191,7 @@ namespace LightvnTools
foreach (string file in files)
{
Console.WriteLine($"Encrypting {Path.GetRelativePath(sourceFolder, file)}...");
XorVndatContent(file);
XOR(file);
}
}
@ -251,48 +284,53 @@ namespace LightvnTools
}
/// <summary>
/// Encrypt (XOR) `.vndat` file content.
/// XOR <paramref name="buffer"/> data.
/// </summary>
/// <param name="buffer"></param>
/// <returns></returns>
static byte[] XOR(byte[] buffer)
{
if (buffer.Length < 100)
{
if (buffer.Length <= 0)
return buffer;
// XOR entire bytes
for (int i = 0; i < buffer.Length; i++)
buffer[i] ^= REVERSED_KEY[i % KEY.Length];
}
else
{
// XOR the first 100 bytes
for (int i = 0; i < 100; i++)
buffer[i] ^= KEY[i % KEY.Length];
// XOR the last 100 bytes
for (int i = 0; i < 99; i++)
buffer[buffer.Length - 99 + i] ^= REVERSED_KEY[i % KEY.Length];
}
return buffer;
}
/// <summary>
/// Do XOR operation on the <paramref name="filePath"/>.
/// </summary>
/// <param name="filePath"></param>
static void XorVndatContent(string filePath)
static void XOR(string filePath, string? outputFilePath = null)
{
try
{
byte[] buffer;
int bufferLength;
using (FileStream inputStream = File.OpenRead(filePath))
{
buffer = new byte[bufferLength = (int)inputStream.Length];
inputStream.Read(buffer, 0, bufferLength);
}
using FileStream inputStream = File.OpenRead(filePath);
buffer = new byte[bufferLength = (int)inputStream.Length];
inputStream.Read(buffer, 0, bufferLength);
if (bufferLength < 100)
{
if (bufferLength == 0)
{
Console.WriteLine($"Skipping {filePath}. File is empty.");
return;
}
buffer = XOR(buffer);
Console.WriteLine($"File size is smaller than 100 bytes: {filePath}");
// XOR entire bytes
for (int i = 0; i < bufferLength; i++)
buffer[i] ^= REVERSED_KEY[i % KEY.Length];
}
else
{
// XOR the first 100 bytes
for (int i = 0; i < 100; i++)
buffer[i] ^= KEY[i % KEY.Length];
// XOR the last 100 bytes
for (int i = 0; i < 99; i++)
buffer[bufferLength - 99 + i] ^= REVERSED_KEY[i % KEY.Length];
}
using FileStream outputStream = File.OpenWrite(filePath);
using FileStream outputStream = File.OpenWrite(outputFilePath ?? filePath);
outputStream.Write(buffer, 0, bufferLength);
}
catch (Exception ex)

2
LightvnTools.csproj
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@ -2,7 +2,7 @@
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFrameworks>net6.0;net7.0</TargetFrameworks>
<TargetFrameworks>net7.0;net8.0</TargetFrameworks>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>

22
README.md
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@ -2,19 +2,27 @@
## Overview
Light.vnTools is an unpack and repacking tool for game created with [Light.vn](https://lightvn.net "Light.vn") game engine.
Light.vnTools is an unpack/decrypt and repack/encrypt tool for game made with [Light.vn](https://lightvn.net "Light.vn") (Visual Novel) game engine.
## Requirements
- [.NET 6.0 SDK](https://dotnet.microsoft.com/download/dotnet/6.0 "Download .NET 6.0 SDK") or [.NET 7.0 SDK](https://dotnet.microsoft.com/download/dotnet/7.0 "Download .NET 7.0 SDK")
- [.NET 7.0 SDK](https://dotnet.microsoft.com/download/dotnet/7.0 "Download .NET 7.0 SDK") / [.NET 8.0 SDK](https://dotnet.microsoft.com/download/dotnet/8.0 "Download .NET 8.0 SDK")
## Usage
> [!IMPORTANT]
> The "new" encryption scheme that works on the newer Light.vn version is stripping the original file name,
> so I can't recover it.
>
> We're missing the original file extension, but we can guess it by reading the file header and set the extension based on that,
>
> For the time being you need to do it yourself by grabbing a hex editor program like [ImHex](https://github.com/WerWolv/ImHex "Visit ImHex GitHub repository"), find the **magic header**, do some Googling then rename the file.
- Download Light.vnTools at [Releases](https://github.com/kiraio-moe/Light.vnTools/releases "Light.vnTools Releases").
- Unpack:
Drag and drop `.vndat` file to `LightvnTools.exe`.
- Repack:
Drag and drop **unpacked folder** to `LightvnTools.exe`.
- Unpack/Decrypt:
Drag and drop `.vndat` / `.mcdat` file(s) to the `LightvnTools.exe`.
- Repack/Encrypt:
Drag and drop **unpacked folder/file(s)** to the `LightvnTools.exe`.
## Credits
@ -28,4 +36,4 @@ For more information about the GNU General Public License version 3.0 (GNU GPL 3
## Disclaimer
This tool is intentionally created as a modding tool to translate the visual novel game created with Light.vn game engine. I didn't condone any piracy in any forms such as taking the game visual and sell it illegally which harm the game developer. Use the tool at your own risk (DWYOR - Do What You Own Risk).
This tool is intentionally created as a modding tool to translate the visual novel game created with Light.vn game engine. I didn't condone any piracy in any forms such as taking the game visual and sell it illegally which harm the developer. Use the tool at your own risk (DWYOR - Do What You Own Risk).