If you're up to a challenging conversion, the complete VisualBASIC 
code for TEA can be found here:

http://www.a1vbcode.com/snippet.asp?ID=468

TEA - Tiny Encryption Algorithm - is relatively secure Feistel cipher 
developed by David Wheeler & Roger Needham. The VB code conforms to 
inventor's C reference. The code is in the public domain.

Ken