XTEA Encryption/Decryption

This goodie provides a sample implementation of the XTEA Encryption/Decryption algorithm
(see http://en.wikipedia.org/wiki/XTEA). It runs in ECB mode with 32 iterations. Its output
has been validated using the Tools4noobs Online Encryption and Decryption Tools
(see http://www.tools4noobs.com/online_tools/encrypt).

This version is NOT compatible with the previous version - if you have data encrypted with
the previous version (from the Instantiations Goodies page) you will need to decrypt you data
with that version and then re-encrypt with this new version.

MIT