# square/certigo

A utility to examine and validate certificates in a variety of formats

Repository: https://github.com/square/certigo
Canonical: https://ross.abutalabs.com/products/certigo
Language: Go
License: Apache-2.0
License Family: permissive
Topics: tls, certificate, ssl, command-line-app, crypto, keystore, pem, x509, pkcs12, jceks, pkcs7, cli
Last push: 2026-04-10T20:19:54+00:00

## Health v2 (maintenance only)
Score: 73/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 76, release rhythm 54, longevity 100
- inputs: {"age_days": 3750, "days_push": 145, "days_rel": 145, "gap_med": 122.5, "n_releases_24m": 3}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1031, forks 77 (observed 2026-08-28T04:03:18.116290+00:00)

## What it is
Certigo is a Go command-line utility for examining, dumping, and validating TLS/SSL certificates in formats like X.509 (DER/PEM), PKCS7, PKCS12, and JCEKS. It can connect to remote servers (including via STARTTLS protocols) to inspect and verify certificate chains, with JSON output for scripting.

## Use cases
- inspect a certificate file from the command line
- debug ssl/tls handshake issues with a remote server
- convert certificates between pem, der, pkcs12 and other formats
- validate a certificate chain and find common certificate errors
- check for expired certificates on a database or mail server via starttls
- script certificate analysis with  output and jq
- examine a java keystore or pkcs12 bundle

## When to choose
- you need a quick CLI to dump or validate certificates in many formats
- you are debugging TLS connections to servers using STARTTLS like MySQL, SMTP, or LDAP
- you want scriptable JSON output for certificate auditing

## When to avoid
- you need a full PKI or certificate authority management solution
- you want a GUI certificate inspector
- you need continuous certificate lifecycle management or automated renewal

## Facets
- artifact type: cli-tool
- maturity: stable
- function: security, cryptography, developer-tools, cli
- domain: security, developer-tools, networking
- platform: windows, cross-platform, cli, go
- tags: tls, ssl, x509, certificates, pem, pkcs12, jceks, pkcs7, keystore, starttls, certificate-validation, debugging, command-line, linux, macos

## Member repositories
- square/certigo (main) score 73

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:18.116290+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T07:07:29.814666+00:00, confidence not recorded.
  - readme: https://github.com/square/certigo (fetched 2026-08-28T04:03:18.116290+00:00, sha 1b4507778459)
- Data as of 2026-08-30T08:39:29.467469+00:00.