This doesn't really address your question, but it may be useful...

I needed encryption in a project once...I looked at blowfish, and ended up
using TEA instead.  They are similar in that they are free, secret key
block ciphers.  TEA (tiny encryption algorithm) was created specifically
to have a small code/memory footprint, and it doesn't put a whole lot of
requirements on the micro...so it works well for a PIC.  I can't really
speak of runtime efficiency, etc.

A notable difference is that TEA has a fixed size key, I believe.

-Steve

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu