ASN1Viewer

A lightweight and fast ASN.1 data viewer, built in C# for Windows. Parses ASN.1 data or files(*.pfx, .p7b, *.pem, *.cer, *.der, etc) and displays it in a tree view.

Features

• 🧬 Parses DER-encoded, PEM-encoded, HEX-encoded ASN.1
• 🌳 Tree-view UI
• 🪟 Built with WinForms
• 📦 Simple executable, no install needed

Screenshots

Getting Started

1. Clone repo
2. Open in Visual Studio
3. Build and run
4. Open sample(Test) files
5. There are 3 ways to open ASN.1 data(file)
   • By menue (File->Open)
   • Drag the file into the Form
   • Input PEM text or HEX text in the “Input Text” tab

Use cases

• Inspect X.509 certificates
• Analyze PKCS structures
• Debug ASN.1-based protocols

License

MIT

This site is open source. Improve this page.