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Now I have these files:

CA Keypair (RSA 4096):

ca.pem, ca-key.pem

Certificate Keypair (ECC 384):

server.csr, server-key.pem

How can I issue the server certificate "server.pem"?

The certificate chain should look like this:

Example CA

example.com

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openssl x509 will sign the certificate for you:

openssl x509 -req -set_serial 1234 -in server.csr -CA ca.pem -CAkey ca-key.pem -out server.pem

However, it's very unlikely that it will produce exactly what you're expecting. Have a read of the man page for all the details. For example, you may want to add specific extensions to the certificate, such as a SAN. In such cases, you need to create a file containing the extension, as follows:

[ san_ext ]

subjectAltName = @alt_names

[alt_names]
DNS.1 = www.example.com
DNS.2 = example.com

The save it (e.g. as san.cnf). Finally, tell OpenSSL about it with the -extfile and the -extensions options:

openssl x509 -req -set_serial 1234 -ext file san.cnf -extensions san_ext -in server.csr -CA ca.pem -CAkey ca-key.pem -out server.pem
  • Yes, the certificate is now issued, but missing SAN. How to add it, then? – Elepover Hedop Dec 6 '18 at 8:48

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