Test specific TLS protocol openssl
Force a version to confirm support; use -tls1_3 / -no_tls1_2 to test policy
openssl s_client -connect <host>:443 -tls1_2 </dev/null 2>&1 | grep -E 'Protocol|Cipher'
more openssl
all 27 commands →
Generate RSA private key
openssl genrsa -out private.key 4096
Generate Ed25519 key pair
openssl genpkey -algorithm ed25519 -out private.key && openssl pkey -in private.key -pubout -out public.key
Create CSR
openssl req -new -key private.key -out request.csr -subj '/CN=example.com/O=MyOrg/C=RU'
Self-signed certificate
openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -days 365 -nodes -subj '/CN=localhost'
View certificate details
openssl x509 -in cert.pem -noout -text | grep -E 'Subject:|Issuer:|Not (Before|After)|DNS:'