Generate RSA private key openssl
Generate a 4096-bit RSA private key
openssl genrsa -out private.key 4096
more openssl
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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:'
Check cert expiry
openssl x509 -in cert.pem -noout -dates