Retriving the SID from a Relative Distinguished Name (RDN)

I have a RDN (like "DC=local, DC=smart, CN=Users, CN=User One") that is returned from a certificate
(CertGetNameString( pCertContext, CERT_NAME_RDN_TYPE,  0, &dwStrType, szNameString, 128))

I would like to have the SID for this RDN name. I guess there must be some kind of Active Directory (ADSI) function for this (preferably that doesn't require binding to a certain domain or server), but my knowledge to ADSI is limited?
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You'll have to use LDAP to connect to the domain to retrieve the user object.   Yes, that means you'll have to bind to any one of the domain controllers (usually by just using the domain name, not a server name).   Yes, that also means that you'll have to provide credentials to do so (unless you're domain is setup as a WinNT compatible domain which allows anonomous enumerations)

Once you've got the user object, you can obtain the the LoginName property.   Using the DomainName and LoginName you then use the LookupAccountName API to return the SID

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