From: "Russell O'Connor" <roconnor@blockstream•io>
To: Johnson Lau <jl2012@xbt•hk>,
Bitcoin Protocol Discussion
<bitcoin-dev@lists•linuxfoundation.org>
Subject: Re: [bitcoin-dev] SIGHASH2 for version 1 witness programme
Date: Fri, 1 Jun 2018 11:03:46 -0400 [thread overview]
Message-ID: <CAMZUoKms85DhtS1mN70nq4LSY7QtXym6E4_yvQk5Q0tizkVwEQ@mail.gmail.com> (raw)
In-Reply-To: <9CCCE945-9432-41B9-8559-AFE7CF233603@xbt.hk>
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On Thu, May 31, 2018 at 2:35 PM, Johnson Lau via bitcoin-dev <
bitcoin-dev@lists•linuxfoundation.org> wrote:
>
> Double SHA256 of the serialization of:
>
Should we replace the Double SHA256 with a Single SHA256? There is no
possible length extension attack here. Or are we speculating that there is
a robustness of Double SHA256 in the presence of SHA256 breaking?
I suggest putting `sigversion` at the beginning instead of the end of the
format. Because its value is constant, the beginning of the SHA-256
computation could be pre-computed in advance. Furthermore, if we make the
`sigversion` exactly 64-bytes long then the entire first block of the
SHA-256 compression function could be pre-computed.
Can we add CHECKSIGFROMSTACK or do you think that would go into a separate
BIP?
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next prev parent reply other threads:[~2018-06-01 15:04 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-31 18:35 Johnson Lau
2018-06-01 15:03 ` Russell O'Connor [this message]
2018-06-01 17:03 ` Johnson Lau
2018-06-01 18:15 ` Russell O'Connor
2018-06-01 18:45 ` Johnson Lau
2018-07-02 18:23 ` Gregory Maxwell
2018-08-30 20:38 ` Johnson Lau
2018-08-30 20:51 ` Christian Decker
2018-08-31 7:42 ` Johnson Lau
2018-09-03 13:53 ` Christian Decker
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