From: Peter Todd <pete@petertodd.org>
To: Mike Hearn <mike@plan99.net>
Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] Multisign payment protocol?
Date: Wed, 12 Mar 2014 12:24:58 -0400 [thread overview]
Message-ID: <20140312162458.GA2337@savin> (raw)
In-Reply-To: <CANEZrP1rfHzSrkWGeuNB07Gy9OBj9a+AfY7deQgJzg4TX_QMMg@mail.gmail.com>
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On Wed, Mar 12, 2014 at 05:14:25PM +0100, Mike Hearn wrote:
> >
> > Can this be calculated in advance knowing the initial transaction size and
> > the number of signatures required?
> >
>
> Sure of course. You assume each signature to be placed in the tx is 73
> bytes. Not very hard, but if the tx you get back from the API doesn't
> contain such a 73-byte sentinel value then it's harder to be sure that this
> part was done correctly.
Multisig signing is an example of untrusted input from an adversary;
this is a good example where you'd be better off just handling it
correctly rather than trying to "make it easier". (although handling it
correctly may include internally converting every not-yet-signed dummy
signature into a 73 bytes pushdata prior to calculating the size)
--
'peter'[:-1]@petertodd.org
0000000000000000e18643801741dc70db6fda175230012b0f697024218cd9ef
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next prev parent reply other threads:[~2014-03-12 16:25 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-10 17:39 [Bitcoin-development] Multisign payment protocol? Drak
2014-03-10 17:49 ` Gavin Andresen
2014-03-10 18:01 ` Alan Reiner
2014-03-11 0:04 ` kjj
2014-03-11 0:09 ` Alan Reiner
2014-03-11 0:14 ` Jeff Garzik
2014-03-11 1:15 ` Gavin Andresen
2014-03-11 11:43 ` Drak
2014-03-11 12:38 ` Jeff Garzik
2014-03-11 13:51 ` Gavin Andresen
2014-03-11 14:13 ` Jeff Garzik
2014-03-11 14:23 ` Gavin Andresen
2014-03-11 14:34 ` Jeff Garzik
2014-03-11 14:44 ` Jeff Garzik
2014-03-11 14:53 ` Gary Rowe
2014-03-11 15:18 ` Mike Hearn
2014-03-11 17:11 ` Miron
2014-03-11 15:37 ` Thomas Voegtlin
2014-03-11 21:12 ` Peter Todd
2014-03-11 17:41 ` Odinn Cyberguerrilla
2014-03-12 0:29 ` Jean-Pierre Rupp
2014-03-12 2:35 ` Alan Reiner
2014-03-12 2:48 ` Eric Lombrozo
2014-03-12 9:48 ` Mike Hearn
2014-03-12 15:35 ` Jeff Garzik
2014-03-12 16:02 ` Mike Hearn
2014-03-12 16:09 ` Drak
2014-03-12 16:14 ` Mike Hearn
2014-03-12 16:24 ` Peter Todd [this message]
2014-03-12 16:33 ` Jeff Garzik
2014-03-12 16:41 ` Mike Hearn
2014-03-12 16:47 ` Peter Todd
2014-03-12 16:57 ` Jeff Garzik
2014-03-10 17:50 ` Mike Hearn
2014-03-10 18:12 ` Jeff Garzik
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