Verifying Certificates Against a CA
If the CA that issued a particular certificate is running Microsoft's Certificate Server, Windows 2000 Server (also NT4 Server with the Option Pack installed) provides you with a COM object you can use to check the status of a particular certificate. You also can use this COM object to administer the certificate services of the CA, assuming that you have the appropriate permissions to do so.
Extracting a Certificate Serial Number
Before you can verify a certificate's validity, you need to be able to get the certificate's serial number. This piece of information is available through the CERT_INFO type structure. The definition for this type structure is as follows:
Type CERT_INFO dwVersion As Long ...
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