Crypt::LE provides the functionality necessary to use Let's Encrypt API and generate free SSL certificates for your domains. It can also be used to generate RSA keys and Certificate Signing Requests or to revoke previously issued certificates. Crypt::LE is shipped with a self-sufficient client for obtaining SSL certificates - le.pl. The client supports 'http' and 'dns' domain verification out of the box. WWW: https://metacpan.org/release/Crypt-LE