Wireguard FPGA

Wireguard FPGA offers a groundbreaking open-source hardware implementation of the Wireguard VPN protocol, tailored for low-cost Artix7 FPGAs. This project stands out by addressing the limitations of existing VPN solutions, leveraging affordable hardware while ensuring no compromise on privacy and security. This project invites community involvement for code review across all aspects from RTL design to build processes and beyond.

Overview

Virtual Private Networks (VPNs) are integral to Internet security. They connect diverse networks through encrypted tunnels, creating a cohesive private network over public infrastructures. With traditional solutions like OpenVPN and IPSec becoming less effective, Wireguard has emerged as a preferred choice due to its modern and streamlined approach to data tunneling and encryption.

Existing hardware implementations of Wireguard often fall short of desired performance levels, being either too expensive or reliant on proprietary, closed-source technologies. This project's goal is to fill that gap by delivering a comprehensive, open-source FPGA implementation using SystemVerilog HDL.

Historical Context

The project team previously contributed to the Blackwire initiative, a high-end 100Gbps hardware Wireguard implementation utilizing proprietary technology, which limited accessibility for many educational institutions. While Blackwire was eventually released as open-source, its original proprietary nature and controversies surrounding its ownership posed significant issues.

The Accessibility Vision

This project aspires to democratize access to hardware Wireguard implementations through:

• An inexpensive hardware platform featuring four 1000Base-T ports.
• An independent deployment approach, enabling operation without a PC host.
• An emphasis on using a commodity Artix7 FPGA, supported by open-source tools.
• Gateware created with Verilog/SystemVerilog, promoting wider accessibility and usability.

Challenges Ahead

Several challenges must be addressed to realize the project’s full potential, including:

1. Hardware and software interactions and partitioning.
2. Integration and debugging complexities in a multi-disciplinary development environment.
3. Real-life testing under operational conditions.
4. Utilizing open-source tools to ensure effective support for SystemVerilog.
5. Achieving efficient quality of results while navigating budget constraints.

Project Plan

The project is structured in multiple phases:

1. Proof of Concept: Establish foundational functionality.
2. Implementation of Wireguard link: Create a basic hardware datapath.
3. Software Development: Integrate management software and control planes.
4. VPN Tunnel Management: Oversee session lifecycle management.
5. Testing and Profiling: Ensure performance aligns with wire-speed benchmarks.
6. Flow Control Module: Optimize data management for stability and efficiency.

Technical Architecture

The Wireguard node operates on a two-layer architecture, where:

• Control Plane: Manages routing processes and Wireguard protocols, running on a soft RISC-V CPU.
• Data Plane: Handles routing and encryption tasks at wire speed, implemented entirely in RTL on FPGA.

Simulation and Testing Framework

The project includes a flexible simulation test bench that supports both HDL implementations and co-simulation environments to enhance testing speed and reliability.

Community and Future Directions

This initiative remains a work in progress, with ongoing community engagement encouraged. Feedback will guide enhancements, such as increasing channel capacity or providing graphical user interfaces for management.

Conclusion

Wireguard FPGA illustrates a commitment to open-source development in cybersecurity, allowing broader access to hardware-based VPN solutions without reliance on expensive and proprietary technologies.

Emphasis on collaboration, transparency, and innovation underpins every aspect of the project, and contributions from various stakeholders will drive it forward.