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authorJohnson Lau <jl2012@xbt.hk>2018-12-13 04:00:50 +0800
committerbitcoindev <bitcoindev@gnusha.org>2018-12-12 20:01:07 +0000
commit97589cff2cf4496431f4bf51f285a1a32a42dbf2 (patch)
treeecd91632f018f1fda26e70aa4ecadddc5c050e0d /5c
parente426d91b7cac04ca17a803651698f4a412488cd8 (diff)
downloadpi-bitcoindev-97589cff2cf4496431f4bf51f285a1a32a42dbf2.tar.gz
pi-bitcoindev-97589cff2cf4496431f4bf51f285a1a32a42dbf2.zip
Re: [bitcoin-dev] Safer sighashes and more granular SIGHASH_NOINPUT
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+From: Johnson Lau <jl2012@xbt.hk>
+In-Reply-To: <87ftv3xerx.fsf@rustcorp.com.au>
+Date: Thu, 13 Dec 2018 04:00:50 +0800
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+Message-Id: <DAAB7568-A004-4897-B5B3-0FBBC6895246@xbt.hk>
+References: <CAPg+sBhuPG-2GXc+Bp0yv5ywry2fk56LPLT4AY0Kcs+YEoz4FA@mail.gmail.com>
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+To: Rusty Russell <rusty@rustcorp.com.au>,
+ bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org>
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+Subject: Re: [bitcoin-dev] Safer sighashes and more granular SIGHASH_NOINPUT
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+
+
+> On 12 Dec 2018, at 5:42 PM, Rusty Russell via bitcoin-dev =
+<bitcoin-dev@lists.linuxfoundation.org> wrote:
+>=20
+> Pieter Wuille via bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org> =
+writes:
+>> Here is a combined proposal:
+>> * Three new sighash flags are added: SIGHASH_NOINPUT, SIGHASH_NOFEE,
+>> and SIGHASH_SCRIPTMASK.
+>> * A new opcode OP_MASK is added, which acts as a NOP during =
+execution.
+>> * The sighash is computed like in BIP143, but:
+>> * If SIGHASH_SCRIPTMASK is present, for every OP_MASK in scriptCode
+>> the subsequent opcode/push is removed.
+>=20
+> I'm asking on-list because I'm sure I'm not the only confused one.
+>=20
+> Having the SIGHASH_SCRIPTMASK flag is redundant AFAICT: why not always
+> perform mask-removal for signing?
+
+Because a hardware wallet may want to know what exact script it is =
+signing?
+
+Masked script has reduced security, but this is a tradeoff with =
+functionality (e.g. eltoo can=E2=80=99t work without masking part of the =
+script). So when you don=E2=80=99t need that extra functionality, you go =
+back to better security
+
+However, I=E2=80=99m not sure if there is any useful NOINPUT case with =
+unmasked script.
+
+>=20
+> If you're signing arbitrary scripts, you're surely in trouble already?
+>=20
+> And I am struggling to understand the role of scriptmask in a taproot
+> world, where the alternate script is both hidden and general?
+
+It makes sure that your signature is applicable to a specific script =
+branch, not others (assuming you use the same pubkey in many branches, =
+which is avoidable)
+
+>=20
+> I look forward to learning what I missed!
+> Rusty.
+> _______________________________________________
+> bitcoin-dev mailing list
+> bitcoin-dev@lists.linuxfoundation.org
+> https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
+
+
+