FileSigner

A high-performance .NET 10 console application designed to ingest files, convert them to binary representation, store them in memory, and generate cryptographically valid digital signatures (SHA-256 hash + ECDSA P-256).

🚀 Features

• File Validation: Strict file extension whitelist (.txt, .md, .json, .xml, .csv, .pdf, .bin) and file size limits (default 5 MB).
• In-Memory Storage: Thread-safe storage holding raw byte payloads, metadata, hashes, and cryptographic signatures.
• File Retrieval: Lookup and export stored files by unique ID or file name.
• Cryptographic Signing: Digitally signs file data using SHA-256 and ECDSA (Elliptic Curve Digital Signature Algorithm).
• Cryptographic Verification: Verifies signatures against file contents and public keys to detect tampering.

📋 Prerequisites

• .NET 10 SDK (version 10.0.100 or later)
• Operating System: Windows, macOS, or Linux

🛠️ Getting Started

Installation

Clone the repository:

git clone https://github.com/laborges94/text-editor.git
cd text-editor

Build the project

dotnet build

Run the application

dotnet run --project src/FileSigner

Run tests

dotnet test

📂 Project Structure

├── .github/
│   ├── workflows/              # GitHub Actions CI/CD pipelines
│   ├── CONTRIBUTING.md         # Contribution guidelines
│   ├── copilot-instructions.md # Coding styles and prompt configurations
│   └── pull_request_template.md
├── src/
│   └── FileSigner/             # .NET 10 Console Application
│       ├── Models/             # Domain records and options
│       ├── Services/           # Storage, validator, and crypto services
│       └── Program.cs          # Console entry point & interactive CLI
├── tests/
│   └── FileSigner.Tests/       # Unit & Integration tests (xUnit)
├── .editorconfig               # Formatting and style rules
├── .gitattributes              # Line endings configuration
├── .gitignore                  # Git ignore patterns
├── AGENTS.md                   # Instructions for AI coding assistants
├── LICENSE                     # Open source license (MIT)
├── README.md                   # Project documentation
└── FileSigner.slnx             # Solution file

🤝 Contributing

Contributions, issues, and feature requests are welcome! Feel free to check the Contributing Guidelines.

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.