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I have been sent two txt files from somebody who used to maintain a website for a client.

One contains the certificate from Thawte with:

---BEGIN CERTIFICATE---
xxxxxxxx
---END CERTIFICATE---

The other contains the RSA Private Key

-----BEGIN RSA PRIVATE KEY-----
xxxxxxxx
-----END RSA PRIVATE KEY-----

I've got the Certificate imported to Windows Server 2008, using the MMC snap-in, but it doesn't have the matching Private Key.

Is there anyway to create and install the private key from the second text file? Or do I need to create a new CSR request, and get a new certificate?

I'd rather create it from what has been sent if possible, just because I don't have access to the Thawte site to login, and the previous developer lives in the US and can be slow to respond. My client is in a rush to have the SSL up and running again.

I've not found an answer online, so guessing I have to generate a new request?

Any help greatly appreciated.

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2 Answers 2

up vote 4 down vote accepted

OpenSSL can convert the certificate/key to PKCS#12 format, which Windows should be able to import.

openssl pkcs12 -export -in foo.crt -inkey foo.key -out foo.p12
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This worked great. I downloaded a Windows version from slproweb.com/products/Win32OpenSSL.html –  Dan Harris Aug 16 '11 at 15:52

I believe this will describe the process needed to import the private key and pair it with the certificate: http://blogs.iis.net/lprete/archive/2007/11/25/assign-a-private-key-to-a-new-certificate-after-you-use-the-certificates-snap-in-to-delete-the-original-certificate-in-internet-information-services.aspx

Also, I'd consider this more of a Serverfault question.

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Using the method above, I believe it would only work if you already have the private key on the machine, but deleted the public certificate. You would use the above when you want to re-connect the two after re-adding the public certificate –  Dan Harris Aug 16 '11 at 15:53

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