encode with aes
openssl aes-256-cfb -pass file:pwfile
decode with aes
openssl aes-256-cfb -d -pass file:pwfile
check website certificate
echo | openssl s_client -connect example.com:443 2>/dev/null | openssl x509 -noout -dates
check local cert
openssl x509 -in cert.pem -text -noout