cert

cert — a certificate and X.509 swiss‑army knife

cert is a small command‑line tool for inspecting and working with X.509/TLS certificates and connections. It consolidates several utilities from goutils into a single, ergonomic CLI.

AI notes:

• None of the code has been written with AI.
• The docs are currently largely AI-generated while I work on the tool itself.

Overview

cert is a tool that combines a lot of the small programs I've written over the last decade in building PKI systems. It's intended to help test systems, diagnose errors, and generally assist with validating PKI systems.

Most of the subcommands have documentation.

Requirements

• Go toolchain installed. The module currently declares:
  • go 1.25 in go.mod (use a compatible or newer Go version).

Installation

• Build a local binary:

  git clone https://github.com/kisom/cert && cd cert
  go build -o cert .

• Or install into your $GOBIN/$GOPATH/bin:

  go install github.com/kisom/cert@latest

• The releases page has binaries available.

• There is a homebrew tap available:

  brew tap kisom/homebrew-tap
  brew install cert

This will also install the man pages and shell completions.