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From: Rene Rivera (grafik.list_at_[hidden])
Date: 2006-05-10 00:03:02

Beman Dawes wrote:
> "Mateusz Rukowicz" <mateusz.rukowicz_at_[hidden]> wrote in message
>> Hi,
>> I would like to participate in summer of code 2006. I was very surprised
>> that boost doesn't have multi precision arithmetic, and since I'm quite
>> algorithm/C++ concerned, I wish to propose/make it as a SoC project.
>> I'll appreciate any response about that idea, what do you feel about
>> that etc.
> At the Berlin C++ committee meeting earlier this month the LWG decided
> expressed interest in getting a further proposal for infinite precision
> arithmetic for TR2 based on

One aspect that isn't address by that paper, and non of the others I've
seen references to, is use of infinite precision integer in the
cryptography domain. There are a few aspects in that domain that make
the proposals I've seen useless. There are two aspects which must be

1. Security of memory allocation.
2. Access to normalized representation.

Aspect #2 is needed for extraction and injection (IO but not iostream).
In crypto there are a variety of ways to represent such numbers as
required by certificates, keys, protocols, etc. So a documented access
to the representation is essential for implementing such translation

Aspect #1; Crypto needs to make specific guarantees for the memory it
uses for computation. For C++ this usually means that all the code needs
to work with some for a special secure allocator. The way that Botan
<> (this is the lib I use for the crypto uses
I have) is to implement secure versions of some containers, and use
those in its BigInt implementation.

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