baseline: OpenMU upstream b5a0961 (fresh source)

src/ClientErrorLogDecryptor/MUnique.OpenMU.ClientErrorLogDecryptor.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+	<PropertyGroup>
+		<OutputType>Exe</OutputType>
+		<TargetFramework>net10.0</TargetFramework>
+		<Nullable>enable</Nullable>
+		<WarningsAsErrors>nullable;CS4014;VSTHRD110;VSTHRD100</WarningsAsErrors>
+		<GenerateAssemblyInfo>false</GenerateAssemblyInfo>
+		<AppendTargetFrameworkToOutputPath>false</AppendTargetFrameworkToOutputPath>
+		<PlatformTarget>AnyCPU</PlatformTarget>
+	</PropertyGroup>
+
+	<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
+		<OutputPath>bin\Debug\</OutputPath>
+		<DocumentationFile>bin\Debug\MUnique.OpenMU.ClientErrorLogDecryptor.xml</DocumentationFile>
+	</PropertyGroup>
+
+	<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">
+		<OutputPath>bin\Release\</OutputPath>
+		<DocumentationFile>bin\Release\MUnique.OpenMU.ClientErrorLogDecryptor.xml</DocumentationFile>
+	</PropertyGroup>
+</Project>

src/ClientErrorLogDecryptor/Program.cs

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+// <copyright file="Program.cs" company="MUnique">
+// Licensed under the MIT License. See LICENSE file in the project root for full license information.
+// </copyright>
+
+using System.IO;
+
+var logPath = args.FirstOrDefault();
+if (string.IsNullOrWhiteSpace(logPath))
+{
+    Console.WriteLine("No path to the error log specified as first parameter. Press any key to exit...");
+    Console.ReadKey();
+    return;
+}
+
+var decryptionKey = new byte[] { 0x7C, 0xBD, 0x81, 0x9F, 0x3D, 0x93, 0xE2, 0x56, 0x2A, 0x73, 0xD2, 0x3E, 0xF2, 0x83, 0x95, 0xBF };
+try
+{
+    var fileBytes = await File.ReadAllBytesAsync(logPath).ConfigureAwait(false);
+
+    var resultBuilder = new StringBuilder();
+    var i = 0;
+    foreach (var character in fileBytes)
+    {
+        var result = (char)(character ^ decryptionKey[i % decryptionKey.Length]);
+        resultBuilder.Append(result);
+        i++;
+    }
+
+    var resultPath = logPath + ".decrypted.txt";
+    File.WriteAllText(resultPath, resultBuilder.ToString());
+    Console.WriteLine($"Decrypted file has been written to {resultPath}. Press any key to exit...");
+}
+catch (Exception ex)
+{
+    Console.WriteLine($"Unexpected error during decrypting the file '{logPath}':");
+    Console.WriteLine(ex);
+
+    Console.WriteLine($"Press any key to exit...");
+}
+
+Console.ReadKey();

src/ClientErrorLogDecryptor/Readme.md

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+# Client Error Log Decryptor
+
+This tool can be used to decrypt the MuError.log files which are created by the
+game client on every start.
+
+It might help to find/analyse errors which occured on the client side.
+
+## Usage
+
+This is a command line tool. The file name is given as first parameter. If it
+contains spaces, wrap it by quotes.
+Example: ```MUnique.OpenMU.ClientErrorLogDecryptor.exe "C:\MU-Season 6E3\MuError.log"```
+
+On windows you can also just simply drag & drop your MuError.log file on the exe.
+
+The resulting file is written out into a new file, where the file name is extended
+by ".decrypted.txt".