How to change only topic (CN) in existing csr

Question

I have csr (Request Signing Request).

I just need to change the CN from this csr, leaving the other fields intact. This is similar to updating existing csr.

This should be done automatically. Is there a way to do this in c / c ++ / openssl?

Answer 1

You cannot change anything in the request file because it is a digitally signed message. If you change at least one bit, you cancel the signature. The CA server will reject it.

What can you do:

• create a new CSR
• instruct the CA to ignore the subject field and indicate something else when issuing the certificate (this procedure depends on the CA software).