How can you get a certificate in code on Windows Azure

I'm trying to create our own WIF Identity Provider and run it on Azure but I'm struggling when trying to automatically generate the Federation Metadata.

This line does not appear to work on Azure:

CertificateUtil.GetCertificate(StoreName.My, StoreLocation.LocalMachine, signingCertificateName);

The certificate is uploaded to Azure, how can I get hold of it?

Thanks