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From: "Martin Dowie" <martin.dowie@btopenworld.com>
Subject: Re: Bitmanipulation in Ada
Date: Thu, 19 Aug 2004 18:09:23 +0000 (UTC)
Date: 2004-08-19T18:09:23+00:00	[thread overview]
Message-ID: <cg2qcj$de0$1@titan.btinternet.com> (raw)
In-Reply-To: Xns954AC8912E35DBerndSpechgmxcom@151.189.20.10

Bernd Specht wrote:
> Always? What do you think about bitscrambling software which has to
> treat data alternating as bitvector and as integer value in a loop
> like this (not exeactly this for securitity reasons):
>
> ...
> loop
>   declare
>     x : boolean;
>   begin
>      x := b(k);
>      b(k) := b(32 - k);
>      b (32 - k) := x;
>      I := I * prime1 mod prime2;
>   end;
> end loop;
>
>
> Can you find an equivalent algorithm where you can separate the
> bit-ops and the integer-ops?

Sorry, I'm missing something... Are "I" and "b" different views of the same
address space?






  reply	other threads:[~2004-08-19 18:09 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-08-18 20:37 Bitmanipulation in Ada Bernd Specht
2004-08-18 20:51 ` Ludovic Brenta
2004-08-18 21:10   ` Bernd Specht
2004-08-18 21:16     ` Ludovic Brenta
2004-08-18 21:18     ` Ed Falis
2004-08-19 17:30       ` Bernd Specht
2004-08-19 17:44         ` Ed Falis
2004-08-19  0:53     ` Jeffrey Carter
2004-08-19 17:44       ` Bernd Specht
2004-08-19 18:09         ` Martin Dowie [this message]
2004-08-19 18:28           ` Bernd Specht
2004-08-19 19:31             ` Martin Dowie
2004-08-19 20:29             ` Martin Dowie
2004-08-20 21:31               ` Bernd Specht
2004-08-19 19:17         ` Jeffrey Carter
2004-08-19 19:57           ` Björn Persson
2004-08-20  0:52             ` Jeffrey Carter
2004-08-19 21:24         ` Francois G. Dorais
2004-08-20  8:55           ` Pascal Obry
2004-08-20  7:26         ` Jean-Pierre Rosen
2004-08-20 21:20           ` Bernd Specht
2004-08-20 21:39             ` Ed Falis
2004-08-18 21:14 ` (see below)
2004-08-18 21:56   ` Martin Dowie
2004-08-19 15:25     ` (see below)
2004-08-19 15:50       ` Martin Dowie
2004-08-18 21:53 ` Martin Dowie
2004-08-18 22:59   ` Björn Persson
2004-08-19  8:08   ` Egil H. H�vik
2004-08-19 17:46   ` Bernd Specht
2004-08-20 20:57 ` Bitordering? was " Alfred Hilscher
2004-08-21 11:34   ` Nick Roberts
2004-08-21 14:00     ` Jim Rogers
2004-08-21 16:54       ` Simon Wright
2004-08-21 16:55     ` Georg Bauhaus
2004-08-23 18:36       ` Alfred Hilscher
2004-08-23 18:47     ` Alfred Hilscher
2004-08-23 22:39       ` Nick Roberts
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