I'm looking for some kind of encryption/decryption package (preferrably free) for VDF. I've been looking at gnuPG, but I don't want to use CLI and would rather have a DLL or ActiveX I could hook with VDF.

I need something to generate my key pair and then methods to perform string encryption and decryption using the keys within my VDF program.

Any help would greatly be appreciated. I've googled for several Open Source solutions but haven't found any DLLs or ActiveX that are free. If I need to pay thats okay too I guess, but the ones that I did find have very complex licensing schemes and I'd like to stay away from that if I could.