Cfssl

Jul 20, 2023

Cloudflare’s PKI and TLS toolkit

CFSSL is Cloudflare’s PKI/TLS swiss army knife. It is both a command line tool and an HTTP API server for signing, verifying, and bundling TLS certificates.

CFSSL consists of

  • a set of packages useful for building custom TLS PKI tools
  • the cfssl program, which is the canonical command line utility using the CFSSL packages
  • the multirootca program, which is a certificate authority server that can use multiple signing keys
  • the mkbundle program is used to build certificate pool bundles
  • the cfssljson program, which takes the JSON output from the cfssl and multirootca programs and writes certificates, keys, CSRs, and bundles to disk


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