From: Douglas Roark <doug@bitcoinarmory•com>
To: Bitcoin Dev <bitcoin-development@lists•sourceforge.net>
Subject: Re: [Bitcoin-development] [softfork proposal] Strict DER signatures
Date: Wed, 21 Jan 2015 14:29:52 -0500 [thread overview]
Message-ID: <54BFFE30.8010105@bitcoinarmory.com> (raw)
In-Reply-To: <CAPg+sBhk7F2OHT64i2LNSjv8DR5tD3RJkLJGzPGZW8OPQTCjQw@mail.gmail.com>
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On 2015/1/20 19:35, Pieter Wuille wrote:> Hello everyone,
> Comments/criticisms are very welcome, but I'd prefer keeping the
> discussion here on the mailinglist (which is more accessible than
> on the gist).
Nice paper, Pieter. I do have a bit of feedback.
1)The first sentence of "Deployment" has a typo. "We reuse the
double-threshold switchover mechanism from BIP 34, with the same
*thresholds*, [....]"
2)I think the handling of the sighash byte in the comments of
IsDERSignature() could use a little tweaking. If you look at
CheckSignatureEncoding() in the actual code (src/script/interpreter.cpp
in master), it's clear that the sighash byte is included as part of the
signature struct, even though it's not part of the actual DER encoding
being checked by IsDERSignature(). This is fine. I just think that the
code comments in the paper ought to make this point clearer, either in
the sighash description, or as a comment when checking the sig size
(i.e., size-3 is valid because sighash is included), or both.
3)The paper says a sig with size=0 is correctly coded but is neither
valid nor DER. Perhaps this code should be elsewhere in the Bitcoin
code? It seems to me that letting a sig pass in IsDERSignature() when
it's not actually DER-encoded is incorrect.
Thanks.
- ---
Douglas Roark
Senior Developer
Armory Technologies, Inc.
doug@bitcoinarmory•com
PGP key ID: 92ADC0D7
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next prev parent reply other threads:[~2015-01-21 20:03 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-21 0:35 Pieter Wuille
2015-01-21 4:45 ` Rusty Russell
2015-01-21 16:49 ` Pieter Wuille
2015-01-21 19:10 ` Peter Todd
2015-01-21 19:29 ` Douglas Roark [this message]
2015-01-21 20:30 ` Pieter Wuille
2015-01-21 20:39 ` Douglas Roark
2015-01-21 20:37 ` Gavin Andresen
2015-01-21 20:52 ` Douglas Roark
2015-01-21 21:22 ` Pieter Wuille
2015-01-21 20:27 ` Andrew Poelstra
2015-01-21 22:57 ` Dave Collins
2015-01-22 0:32 ` Rusty Russell
2015-01-22 3:12 ` David Vorick
2015-01-22 4:18 ` Matt Whitlock
2015-01-22 4:20 ` Pieter Wuille
2015-01-25 14:34 ` Pieter Wuille
2015-01-25 14:48 ` Gregory Maxwell
2015-02-03 0:44 ` Pieter Wuille
2015-02-03 2:21 ` Gregory Maxwell
2015-02-03 12:00 ` Wladimir
2015-02-03 14:30 ` Alex Morcos
2015-02-03 18:15 ` Pieter Wuille
2015-02-03 18:19 ` Gavin Andresen
2015-02-03 19:22 ` Jeff Garzik
2015-02-03 23:38 ` Pieter Wuille
2015-01-22 22:41 ` Zooko Wilcox-OHearn
2015-01-25 16:57 ` Pieter Wuille
2015-01-26 5:14 ` Pieter Wuille
2015-01-26 18:35 ` Gregory Maxwell
2015-01-28 6:24 ` Wladimir
2015-02-06 21:38 ` Pieter Wuille
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