On Monday, June 23, 2003, at 12:19 PM, Mark Brownell wrote:
the -1 is in regards to the bitAnd part of the f function's S-boxes.
f = S1[a] + S2[b] f = bitXor( f , S3[c] ) f = bitAnd( f + S4[d], -1 )
Yeah, replace that last bitAnd with a mod 2^32.
I'm tempted to get that highly recommended book that you referenced.
You will see that my final one line for above turns out to read just like the line in the book.
If you have a reference you prefer, I'm willing to let you buy me a copy of that! But if you don't do that and you can afford it, get Schneier. It will help in clarifying your thoughts and in communicating with people like me. It covers Blowfish, block ciphers in general, and Freistel networks in general. It even has C code for Blowfish.
Dar Scott
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