Generate Ed25519 key pair openssl
Modern Ed25519 key (smaller, faster than RSA)
openssl genpkey -algorithm ed25519 -out private.key && openssl pkey -in private.key -pubout -out public.key
more openssl
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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
Verify cert against CA
openssl verify -CAfile ca.pem cert.pem