How to import external RSA keys

[Carolin Latze]

Hello everybody,

I'm looking for a possibility to import extern RSA keys into a program 
which is written using gcrypt.h. I want to encrypt and decrypt data 
using this program but I want to use RSA keys which are stored on a 
Cryptoflex Smartcard by Schlumberger. These keys should be stored an 
ASCII format (or something similar). Has anybody an idea how to import 
these keys into a program written with the gcrypt.h? Till now, I didn't 
find any.. :(

Bye
Carolin