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From: Matt Whitlock <bip@mattwhitlock.name>
To: Gregory Maxwell <gmaxwell@gmail.com>
Date: Mon, 07 Apr 2014 21:46:21 -0400
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Cc: bitcoin-development <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] Presenting a BIP for Shamir's Secret
	Sharing of Bitcoin private keys
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On Monday, 7 April 2014, at 5:38 pm, Gregory Maxwell wrote:
> On Mon, Apr 7, 2014 at 5:33 PM, Nikita Schmidt
> <nikita@megiontechnologies.com> wrote:
> > Regarding the choice of fields, any implementation of this BIP will
> > need big integer arithmetic to do base-58 anyway.
> 
> Nah, it doesn't. E.g.
> https://gitorious.org/bitcoin/libblkmaker/source/eb33f9c8e441ffef457a79d76ceed1ea20ab3059:base58.c

That only *decodes* Base58Check. It has no encode function, which would require biginteger division.