Building a reference implementation of a cipher can be an invaluable
aid to writing code. Building a cipher in a spreadsheet, while some
may suggest is strange, is a valid way to effectively describe a
cipher in a visual sense. This has been done before with The
Illustrated DES Spreadsheet, it has been done again. With the help of
a Chinese document and an english translation by Whitfield Diffie and
George Ledin, I was able to create a spreadsheet that demonstrates the
SMS4 algorithm.
This algorithm is rather infamous for being proposed as a WiFi
standard. It is has raised it’s head again as being implemented
inside a derivative of the TCG standard TPM module for China under the
name TCM module.
The SMS4 spreadsheet is available in Mac OS X numbers format and .xls
format at
http://tinyurl.com/cfp6w2
Enjoy.
Jim
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