Creating a self-signed certificate from the keypair on the smartcard

Question

I generated a keypair on the smartcard using pkcs11-tool from OpenSC and the custom PKCS#11 library. This PKCS#11 library is my test object.

Now I want to create a certificate out of this keypair. So far I found the way to create certificate when I have keypair in PEM format (file), but I want to use keypair on the card.

I am working on Windows 7.