Create csr with SAN and old private key

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Dears,

There is an existing internal/local certificate that is used for encryption purposes on the windows server for the .NET applications. The request is to renew the certificate with the old private key.

I have tried the below OpenSSL cmd to generate the CSR with the old private key and it was successful but without SAN(subject Alternate name).

Can anyone please help to generate the CSR with SAN and use the old private key by using OpenSSL?

Thanks in advance.

What I have tried:

openssl x509 -x509toreq -in C:\existing.crt -signkey C:\existing.key -out C:\Cert-new.csr

Posted 13-Feb-23 23:14pm

Abdulsubhan 029

Updated 14-Feb-23 0:12am

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Andre Oosthuizen · Answer 1 · 2023-02-14T00:12:00

Solution 1

Not my field of expertise but I think the following might help, we had a similar issue a while back.

Navigate to the directory where your current key file is located -

openssl req -new -key your_existing_key.key -out your_new_san_file_name.csr -config your_config_file_name.cnf

Set all your information in pop-ups that follows.
Open your config file and add the SAN's for your certificate under the alt_names section.
Submit the CSR to obtain your SAN.

Posted 14-Feb-23 0:12am

Andre Oosthuizen

Updated 14-Feb-23 0:13am

v2

Comments

Abdulsubhan 029 15-Feb-23 2:48am

I'm trying to import the old private key to the csr but no luck. Seek your help.

openssl x509 -x509toreq -in C:\existing.crt -signkey C:\existing.key -out C:\Cert-new.csr -config your_config_file_name.cnf
with SAN but I'm getting the error: "x509: Use -help for summary".

Andre Oosthuizen 15-Feb-23 3:17am

Did you rename this - your_config_file_name.cnf?

Abdulsubhan 029 24-Feb-23 2:42am

Yes