ssl certificate- get private key from csr

Question

Is it possible to export private key from CERTIFICATE SIGNING REQUEST?

I have a CSR file and some CRT files. Now I have to install this certificate. How do I do it or do I need some other files in order to install this certificate?

Answer 1

No you cannot export the private key from CSR because the CSR does not contain any private key.

You need another file that has a private key and if you have that you won't need the CSR to extract the private key.

Answer 2

You create CSR from a private key not other way around.

In general the process goes like

1. You create private key
2. You create CSR Hand CSR to Certificate Authority aka CA
3. CA will give you a Certificate
4. you are good to go with you private key and with certificate depending upon client e.g. PHP Curl is fine with it
5. You may also combine your private key and Certificate using PKCS12 format depending upon your client requirements.