From kde-devel  Fri Feb 25 23:33:28 2005
From: Brad Hards <bradh () frogmouth ! net>
Date: Fri, 25 Feb 2005 23:33:28 +0000
To: kde-devel
Subject: Re: Big numbers
Message-Id: <200502261033.35041.bradh () frogmouth ! net>
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On Thu, 24 Feb 2005 04:53 am, John Tapsell wrote:
>  Is there any bignum library that i can rely on existing? =A0I know it's
> kinda bad to have external dependancies, so if not could one be imported?=
 I
> was thinking perhaps even import an existing library and make a nice KDE
> wrapper for it, so we have an official kde bignum library.
In kdesupport/qca, there is a library (called QCA, for the Qt Cryptographic=
=20
Architecture) that has bignum support. The library is still being worked, b=
ut=20
the bignum support should be OK - I've documented the API, I've done some=20
unit tests, and it looks mostly like you'd expect Qt to work, if it had=20
bignum support. Note that it is integer only, which may not be what you wan=
t,=20
so then you'd have to decide whether to extend QCA, or to write your own.
See http://www.frogmouth.net/qca/classQBigInteger.html

The underlying implementation is from Botan - http://botan.randombit.net/

The question of whether you can rely on it existing is a bit harder. Certai=
nly=20
my goal is to have it as for KDE4 (for a lot of reasons, and kcalc wasn't o=
ne=20
I thought of), so you may need to extract part of the library for kcalc, if=
=20
it all turns bad.

Brad

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