Generate self-signed ssl:

openssl req -new -nodes -x509 -out localhost.crt -newkey rsa:4096 -keyout localhost.key -days 3650

SSL certificate match key and cert:

openssl rsa -noout -modulus -in private.key | openssl md5
openssl x509 -noout -modulus -in certificate.cert | openssl md5

• https://www.sslshopper.com/ssl-checker.html
• https://www.ssllabs.com/ssltest/