Best array population & access optimization
Mark Brownell
gizmotron at earthlink.net
Sat Jun 21 06:17:00 EDT 2003
On Friday, June 20, 2003, at 07:21 PM, Dar Scott wrote:
> However, since Blowfish primitives are xor and addition and since most
> signed numbers are 2-complement it might not matter.
>
> Even so, in Revolution once you bitAnd or bitXor, I would have
> expected unsigned values. I have only seen signed values come up in
> some uses of baseCovert().
It took a while and I was curious to see for myself, You were correct
about expecting unsigned values. I ran a comparison version with the
P-array from the C source code for encrypt and the P-array from the VB
source code on decrypt and it worked. They were different in respect to
signed numbers only. Only the unsigned numbers in the different source
P-boxes were identical.
I changed out the (C sourced S-box-1) for the (VB sourced S-box-1) in
both the encrypt and decrypt handlers. It worked. The complimentary
signed numbers mattered in the S1-boxes as long as the same version
S-box was used for encrypt and decrypt. It showed that S-box-1-VB works
with S-box-2-C, S-box-3-C, and S-box-4-C where only the unsigned
numbers in the two S-box-1 versions were identical.
Mark
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: text/enriched
Size: 1168 bytes
Desc: not available
URL: <http://lists.runrev.com/pipermail/use-livecode/attachments/20030621/b99c8e4a/attachment.bin>
More information about the use-livecode
mailing list