A desktop application built with egui/eframe that provides a graphical interface for generating OpenSSL certificate signing requests (CSRs). The application simplifies the process of creating certificate configurations, executing OpenSSL commands, and packaging certificate files.

• User-friendly GUI for certificate request generation
• Automatic OpenSSL configuration file generation
• Support for Subject Alternative Names (SANs) with auto-detection of DNS names and IP addresses
• Wildcard certificate support
• German umlaut handling (ä, ü, ö)
• Automatic zip packaging of certificate files (.cnf, .key, .csr)
• Auto-save to downloads folder
• Includes recreate command for reference
• Debug mode with test data generation (German locale)

• Rust (latest stable version)
• OpenSSL installed and available in system PATH

1. Clone the repository:

git clone <repository-url>
cd openssl-cert-dioxius

2. Build the project:

cargo build --release

Run the application in development mode:

cargo run

Or run the release build:

cargo run --release

1. Fill in the certificate details:

   • Country: 2-character country code (required)
   • State/Province: Full state or province name
   • Locality: City name
   • Organization: Company or organization name
   • Common Name: Domain name or service identifier
   • SANs: Subject Alternative Names (DNS names or IP addresses)

2. Click Generate Configuration to validate input and create the OpenSSL config

3. Click Execute OpenSSL Command to:

   • Generate the private key and CSR
   • Save all files as a zip package to your downloads folder
   • Display the OpenSSL output

4. Optional: Use Save Certificate Files to manually re-save if needed

• Wildcard Certificates: CN starting with *. is automatically converted for filenames (e.g., *.example.com becomes wildcard.example.com.key)
• Debug Mode: In debug builds, a "Fake input" button generates test data using German locale

cargo build --release

The compiled binary will be available in target/release/openssl-certificate-request-generator (or .exe on Windows)

openssl-cert-dioxius/
├── src/
│   ├── main.rs                    # Entry point and egui App implementation
│   └── openssl_cert_tools.rs      # Core certificate logic and OpenSSL integration
├── Cargo.toml                     # Rust dependencies
└── README.md

• main.rs: Entry point containing egui UI implementation, form state management, and event handlers
• openssl_cert_tools.rs: Certificate logic including:
  • CertConfig: Certificate metadata and config file generation
  • generate_config(): Creates OpenSSL .cnf files with SAN support
  • execute_openssl_command(): Executes OpenSSL CLI commands
  • sanitize(): Handles German umlauts

• egui 0.33.0: Immediate mode GUI framework
• eframe 0.33.0: egui framework for native applications
• zip 6.0.0: Certificate file bundling
• dirs 6.0.0: Downloads directory location
• fake 4.0.0: Test data generation (debug mode only)
• log 0.4.28 & env_logger 0.11.8: Logging infrastructure
• time 0.3.44: Time handling and formatting

1. User fills in certificate details through the egui form interface
2. "Generate Configuration" validates input (especially 2-char country code) and creates OpenSSL config string
3. "Execute OpenSSL Command" writes temp config file, executes openssl req -new, captures output, saves zip to downloads folder, and cleans up temp files
4. Output is displayed in the application's output area

The project is dual licensed under the Unlicense and under GNU GENERAL PUBLIC LICENSE version 3