Re: A few questions about C programming.
From: DEMAINE Benoit-Pierre (nntp_pipex_at_demaine.info)
Date: 10/06/04
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Date: Wed, 06 Oct 2004 04:50:49 +0100
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| a = (a << 3) | ((a >> 29) & 0x03);
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| That looks awful but the compiler should figure out good code for it.
|
| In asm, depending on the machine, there may be a hardware instructionn.
No, I was asking about single instruction operation . About ASM, I use
intel 686.
|>where can I find alternative substitution tables and compressing and
|>expanding tables for DES ? I need as many different tables as possible.
|
|
| You should not mess with the DES tables. They are carefully designed
| and if you change them, you don't have DES any more.
I am aware of that ... that is why I asked about the rules to build
them. I am pretty sure there are alternative tables. Some tables which
keep the same proprieties, but doing stuff an other way. I dont care if
the resulting algorithme is not compatible with original algorithme, as
long as I can write myself the decoder part.
- --
DEMAINE Benoît-Pierre http:/www.demaine.info/
\_o< apt-get remove ispell >o_/
There're 10 types of people: those who can count in binary and those who
can't
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