Peter, so the core of the problem is that you want to reuse the Delphi crypto functions in a newly written WCF service?
Can you wrap the Delphi stuff as a COM server? We've been using COM for exposing .NET to scripts and VB6, and VB6 to .NET and it (eventually) works tolerably well so long as you keep all of the interfaces reasonably vanilla and don't create your own pain. As an aside: If the Delphi crypto code is not compatible with the equivalent Framework classes, then the Delphi code must be implemented incorrectly. Manually coding complete crypto algorithms is a delicate process and you have to be sure they pass all the standard test vector inputs correctly. Did the Delphi authors do that?! Cheers, Greg
