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openssl

Creating Selfsigned Certificate with an Existing Key

Most OpenSSL documentation out there only shows you how to create a new key and signs it with in single command.  I wanted to use a self-signed in the interm while waiting for my third-party CA approve my certificate. I already had an existing key.   Here is the command to create a self-signed certificate from an existing RSA key.

#> openssl req -x509 -new -key {KEYFILE} -out {SELFSIGNEDCERT}

 

Importing an OpenSSL CSR into Windows CA server

To import a CSR in to a Windows Certificate Authority Server, you must define a certificate template.  OpenSSL does not do this because this is a Microsoft only concept.  With the use of the 'certreq' command, you can apply a template type during the request import process.  This command should be available on your Microsoft CA server. 

certreq -submit -attrib "CertificateTemplate:WebServer" request.csr

 

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