OpenSSL

openssl s_client -connect example.com:443 >foo.pem

openssl x509 -outform der -in foo.pem -out foo.der

openssl ciphers -v 'HIGH:MEDIUM:!ADH:!aNULL:!RC4:!MD5'

• OpenSSL Command-Line HOWTO
• https://www.sslshopper.com/ssl-converter.html