Use External DLL in Crystal XI OR pass parameter on Per Record basis?

I have a SQL Server Database that contains the Username, FirstName, LastName and Password for an internal application for our users. The Password has been encrypted in the SQL Server using an internally developed encryption algorithm. The decryption is available to us in a DLL. I need to either import this into Crystal or use it in a VB.NET app that then puts the decrypted password on a CR Report for print out to our users (this is their first-time use passwords; hence the reason we're printing them out). Is there a way to either import the DLL into CR XI or decrypt the field in VB and then display it per record on a CR report? I've passed parameter fields from VB to CR before, but never on a per record basis; it's always been for the whole report.