PyCTools

Note

There are multiple ways to install the pyCTools library!

• Manual installation:

  1. Clone the repository and build the DLLs yourself.
  2. Run python ./tools/setup.py bdist_wheel to create the wheel file.
  3. The setup script will show you how to install the package locally with pip and how to create a virtual environment for testing.

• Automatic installation: Go to the releases page and select the version you wish to install, and click on it, then copy the top pip command that will allow you to install it [Auto installation support from v0.2.0-beta and above]

This project provides a cross-language toolkit for Windows process inspection and hardware random number generation, with both Python and C components. It includes:

• Python library (pyCTools): Easy-to-use wrappers for native DLLs to access process metrics and hardware RNG.
• C source files: Implement the DLLs for process inspection and hardware RNG.
• Example Python scripts: Demonstrate usage of the library.
• PowerShell build helper: Automates DLL compilation for x86/x64.

Important

To get the dist binary folder, choose one of the following options:

Method	Description	Requirements
Manual Build	Compile the binaries yourself using cl.exe or similar toolchains	Microsoft Visual Studio with MSVC installed
Auto Build Script	Run the tool/compilerHelper.ps1 PowerShell script	Visual Studio Build Tools + PowerShell
Prebuilt Release Archive	Download precompiled binaries from the releases page	None, make sure to use the latest available version

No matter what you decide, do still read the important notice about the dist from the release OR check the Wiki page about the DLL discovery explanation.

Directory Structure

📁 Project Structure (click to expand)

root/
├── bin/                               # Auto-generated folder containing compiled DLL binaries
│   ├── x86/                           # 32-bit DLL builds
│   └── x64/                           # 64-bit DLL builds
│
├── dist/                              # Release artifacts for distribution
│   ├── bin.zip                        # Zipped prebuilt binaries
│   └── bin.zip.sha256                 # SHA256 checksum for `bin.zip`
│
├── examples/                          # Example Python scripts demonstrating usage
│   ├── hwrng_example.py               # Example: Hardware RNG usage
│   ├── process_inspect_example.py     # Example: Process inspection usage
│   └── rng_tests/                     # RNG test scripts and outputs
│       ├── rng_output.bin              # 10M bytes of RNG data (complexity 1, threaded)
│       ├── rng_entropy_output.png      # PNG entropy visualization of RNG output
│       ├── Results.txt                 # Test results from `rng_test.py`
│       ├── rng_test.py                 # Script to test hardware RNG
│       └── generate_bin.py             # Generates binary file from RNG
│
├── pyCTools/                          # Python package (library code)
│   ├── __init__.py                    # Package initializer
│   ├── hwrng.py                       # Hardware RNG DLL wrapper
│   ├── processInspect.py               # Process inspection DLL wrapper
│   └── _loadDLL.py                     # DLL loading logic used by wrappers
│
├── tool/                              # Build and distribution tools
│   ├── compilerHelper.ps1              # Compiles C code into DLLs
│   └── distributionHelper.ps1          # Creates `bin.zip` and SHA256 checksum
│
├── src/                               # C source code for DLLs
│   ├── hRng.c                          # Hardware RNG implementation
│   └── processInspect.c                # Process inspection implementation
│
└── CMakeLists.txt                     # CMake build configuration (currently unused)

Building the DLLs

1. Open PowerShell and run:

   cd ./tool/
   compilerHelper.ps1

2. Choose the .c source files you want to compile.

3. The script will compile for both x86 and x64 architectures, placing the output in:

   • bin/x86 (32-bit builds)
   • bin/x64 (64-bit builds)

Important

The build process uses cl.exe from the MSVC toolchain in Visual Studio, so make sure it’s installed and available in your PATH.

Note

• Each compiled source produces four files per architecture: .dll, .exp, .lib, and .obj.

• Only the .dll is needed by the Python library.

• DLL filenames include an architecture suffix:

  • Example: hRng_x86.dll, hRng_x64.dll.

Using the Python Library

• Place the dist/ folder inside the pyCTools package directory, or at max two levels up the library.
• Import and use hwrng or processInspect from pyCTools.
• The library will automatically load the correct DLL based on your Python interpreter architecture (x86 or x64).

Tip

Example usages for both modules in detail:

Hardware RNG

Either check out the example script or the Wiki page

Process Inspection

Either check out the example script or the Wiki page

DLL Discovery

The Python wrappers automatically search for the correct DLL in:

• ./dist/{arch}/<dll>
• ../dist/{arch}/<dll>
• ../../dist/{arch}/<dll>

where {arch} is x64 or x86 depending on your Python interpreter.

More details on how the DLL discovery works can be found in the Wiki page

Extra resources

Tip

Want to dive deeper into how everything works? Head over to the PyCTools Wiki for detailed breakdowns of the key parts:

• DLL explanations: learn how the DLLs are structured, discovered, and loaded • Python examples, wrappers, and usage: practical code snippets and usage patterns in Python • C code explanation: understand the underlying native implementation