DropShare

Secure P2P File Sharing with End-to-End Encryption

DropShare is a secure, private, and easy-to-use peer-to-peer file sharing application that works entirely in your browser. No servers, no sign-ups, just direct connections for fast and secure file transfers.

✨ Features

• Peer-to-Peer: Files are transferred directly between devices without going through a central server.
• End-to-End Encrypted: All files are encrypted using ECDH key exchange with HKDF key derivation and AES-GCM encryption via audited cryptographic libraries (@noble/*). See SECURITY.md for details.
• QR Code Connections: Generate QR codes for easy sharing or scan QR codes to connect to other devices.
• Cross-Platform: Works on any modern browser on any device (desktop, tablet, mobile).
• No Installation: Just open a web page and start sharing.
• Multiple File Support: Share multiple files at once with drag-and-drop support.
• Multiple Recipients: Share files with multiple people simultaneously.
• Connection Verification: Cryptographic challenge-response system ensures secure peer verification.
• Dark/Light Theme: Built-in theme toggle for comfortable use.

🚀 Getting Started

To run DropShare locally, follow these steps:

1. Clone the repository:

   git clone https://github.com/daenax/dropshare.git
   cd dropshare

2. Install dependencies: This project uses bun as the package manager.

   bun install

3. Run the development server:

   bun run dev

4. Open your browser and navigate to the local URL provided (usually http://localhost:5173). To test P2P functionality:

   • On the first device, click "Start Sharing" to generate a QR code
   • On the second device, click "Start Scanning" to scan the QR code and connect
   • Alternatively, you can copy the connection URL and open it directly on the second device

📱 How to Use

1. For Sharing Files:

   • Click "Start Sharing Files" on the landing page
   • Drag and drop files or click to select files you want to share
   • Show the generated QR code to others or share the connection URL
   • Connected devices will appear in the "Connected Receivers" section

2. For Receiving Files:

   • Click "Scan QR Code" on the landing page
   • Point your camera at the sender's QR code
   • Once connected, available files will appear in your list
   • Click the download button on any file to save it to your device

🛠️ Tech Stack

• Framework: React 19 with Vite 7
• Language: TypeScript
• Package Manager: Bun
• P2P Communication: PeerJS (WebRTC)
• Cryptography: @noble/curves, @noble/ciphers, @noble/hashes
• UI: Tailwind CSS v4 with shadcn/ui components
• State Management: Zustand
• QR Codes: react-qr-code (generation) and jsqr (scanning)
• File Handling: react-dropzone
• Code Quality: Biome for linting and formatting

🔒 Security

Security is a core feature of DropShare. All transfers are end-to-end encrypted and authenticated. For a detailed breakdown of the security model, algorithms, and cryptographic libraries used, please read the SECURITY.md file.

🤝 Contributing

Contributions are welcome! Please feel free to open an issue or submit a pull request.

📄 License

This project is licensed under the MIT License.