CSR Generator

A web-based Certificate Signing Request (CSR) generator written in Go, featuring an intuitive interface for creating CSRs with advanced cryptographic options.

Features

• Generate CSRs with RSA or ECDSA keys
• Support for multiple key sizes (RSA: 2048-4096, ECDSA: P-256/384/521)
• Various signature algorithms (SHA256/384/512 with RSA/ECDSA)
• Various key usage options
• Multi-language support (English, Dutch)
• Dark/Light theme
• Basic and Advanced modes
• Support for SAN (Subject Alternative Names)
  • Multiple DNS names
  • Multiple IP addresses
• Copy-to-clipboard functionality
• Download-to-file functionality
• Mobile-responsive design

Requirements

• Go 1.22 or higher

Installation

git clone https://github.com/WatskeBart/csrgen.git
cd csrgen
go mod download

Quick Start

1. Start the server:

go run csrgen.go

1. Open your browser and navigate to http://localhost:8080

Build binary

❗A Go binary by default is only built for the OS and architecture of the machine doing the compilation

go build -o csrgen csrgen.go

Build container image

Pick a image builder you like. docker build or podman build work as well.

buildah build -f Containerfile -t csrgen:mybuild .

Usage

1. Fill in the required certificate information:

   • Common Name (domain name)
   • Organization details
   • Location information
   • Contact email

2. Optional: Toggle Advanced mode for additional settings:

   • Key type selection (RSA/ECDSA)
   • Key size configuration
   • Signature algorithm choice
   • Additional DNS names
   • IP addresses
   • Key usage or extended key usage

3. Click "Generate CSR" to create your Certificate Signing Request

4. Copy the generated CSR and private key

Security Notes

• Private keys are generated locally in your browser
• No data is stored on the server
• Always keep your private key secure and confidential

License

BSD 3-Clause License

Screenshots

See screenshots directory for interface previews showing advanced mode and theme switching.