Obfy 1.0.0

Obfy

Professional .NET obfuscation tool for protecting C# assemblies and source code.

Installation

# Install as a global tool
dotnet tool install --global Obfy

# Or install locally in a project
dotnet new tool-manifest
dotnet tool install Obfy

Usage

# Basic obfuscation
obfy input.dll -o output/

# With specific protection level
obfy input.dll -l aggressive -o output/

# With configuration file
obfy input.dll -c obfy.json -o output/

# Multiple files
obfy file1.dll file2.dll -o output/

Protection Levels

Features

Assembly Obfuscation (dnlib)

• String Encryption - Encrypts string literals with AES-256 or XOR
• Control Flow - Flattens control flow with switch dispatchers
• Symbol Renaming - Renames types, methods, fields, properties
• Anti-Debug - Injects debugger detection checks
• Metadata Removal - Strips debug info and custom attributes

Source Code Obfuscation (Roslyn)

• String Encryption - Encrypts string literals in source code
• Symbol Renaming - Renames identifiers using semantic analysis
• Control Flow - Transforms control flow with opaque predicates

CLI Options

obfy <input> [options]

Arguments:
  <input>  Input file(s) to obfuscate

Options:
  -o, --output <dir>       Output directory
  -l, --level <level>      Protection level (minimal|standard|aggressive|custom)
  -c, --config <file>      Configuration file path
  --string-encrypt         Enable string encryption
  --control-flow           Enable control flow obfuscation
  --rename                 Enable symbol renaming
  --anti-debug             Enable anti-debugging
  --strip-metadata         Remove debug metadata
  --preserve-public        Preserve public API names
  -v, --verbose            Enable verbose output
  --version                Show version
  -?, -h, --help           Show help

Configuration File

Create obfy.json:

{
  "level": "aggressive",
  "stringEncryption": {
    "enabled": true,
    "algorithm": "Aes256"
  },
  "controlFlow": {
    "enabled": true,
    "mode": "SwitchDispatcher",
    "intensity": 75
  },
  "symbolRenaming": {
    "enabled": true,
    "mode": "Unreadable",
    "preservePublicApi": true
  },
  "antiDebug": {
    "enabled": true
  },
  "metadataRemoval": {
    "enabled": true,
    "removeDebugInfo": true
  }
}

License

MIT License - see LICENSE for details.