lovepluseveryDec

xor.cs

using System;
using System.IO;

class Program
{
    static void Main(string[] args)
    {
        if (args.Length == 0)
        {
            return;
        }

        string inputPath = args[0];

        if (Directory.Exists(inputPath))
        {
            string[] files = Directory.GetFiles(inputPath, "*.unity3d", SearchOption.AllDirectories);
            foreach (string file in files)
            {
                DecryptFile(file);
            }
        }
        else if (File.Exists(inputPath))
        {
            DecryptFile(inputPath);
        }
        else
        {
            Console.WriteLine(String.Format("Path {0} Not Found", inputPath));
        }
    }

    static void DecryptFile(string inputFilePath)
    {
        string key = "20160915xx";
        string outputFilePath = Path.ChangeExtension(inputFilePath, "dec.unity3d");

        try
        {
            byte[] inputBytes = File.ReadAllBytes(inputFilePath);
            byte[] outputBytes = new byte[inputBytes.Length];

            for (int i = 0; i < inputBytes.Length; i++)
            {
                outputBytes[i] = (byte)(inputBytes[i] ^ key[i % key.Length]);
            }

            string header = System.Text.Encoding.UTF8.GetString(outputBytes, 0, Math.Min(7, outputBytes.Length));
            if (header == "UnityFS")
            {
                File.WriteAllBytes(outputFilePath, outputBytes);
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine(String.Format("File {0} Error: {1}", inputFilePath, ex.Message));
        }
    }
}

decrypt ラブプラス EVERY 2.0.0 encryptfile
encrypt Magic 0x675E5842