openssl x509 -in cert.pem -outform DER -out cert.der
openssl s_client -starttls smtp -connect mail.example.com:587 4.5.1 Compute SHA-256 Hash openssl for windows 11
openssl req -new -key private.key -out request.csr Interactive prompts for distinguished name. Use -subj for non-interactive scripting: openssl x509 -in cert