lib: Add Taproot support to libconsensus #21158

jrawsthorne · 2021-02-11T22:59:06Z

This change exposes a new function in libconsensus that allows passing spent outputs for Taproot verification. It also adds a VERIFY_TAPROOT flag.

If spent outputs are not provided when the VERIFY_TAPROOT flag is enabled, there is a new error returned SPENT_OUTPUTS_REQUIRED. If the VERIFY_TAPROOT flag is enabled when verify or verify_with_amount then the same error is returned.

I also included testing the consensus lib in the qa asset test.

Closes #21133

ariard

Thanks for adding this. If the API is bumped, take care to notify library users through mentioning the change in 0.22 release note (doc/release-noted.md)

src/script/bitcoinconsensus.cpp

jrawsthorne · 2021-02-14T01:46:03Z

Thanks for adding this. If the API is bumped, take care to notify library users through mentioning the change in 0.22 release note (doc/release-noted.md)

@ariard Thanks for the review. Do you have a suggestion about which section the change should be mentioned in?

ariard · 2021-02-14T22:06:25Z

@jrawsthorne "Tools and Utilities" sounds good to me.

doc/shared-libraries.md

ariard

Code Review ACK 28245a8, thanks for the changes

Up to you to take the nit.

doc/shared-libraries.md

DrahtBot · 2021-03-02T11:39:28Z

The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

Conflicts

Reviewers, this pull request conflicts with the following ones:

Eliminate Signature Checker/Creator Ambiguity w/ LIFETIMEBOUND References #22440 by JeremyRubin

If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.

DrahtBot · 2021-03-15T16:50:05Z

🕵️ @harding has been requested to review this pull request as specified in the REVIEWERS file.

ariard · 2021-04-16T16:50:55Z

Code Review ACK 7c85ec9. Changes from last ACK is complying VerifyScript call to new MissingDataBehavior introduced by b77b0cc and mention of rust-bitcoin lib.

ariard · 2021-04-26T17:33:19Z

@jrawsthorne I think this needs rebase, but that would be cool to land this for downstream projects.

jrawsthorne · 2021-04-26T17:44:14Z

Thanks @ariard, rebased

ariard · 2021-04-30T13:59:49Z

Code Review ACK 096ab5c.

Diff since last ack is swallowing release-note changes.

ariard · 2021-04-30T14:00:53Z

@SomberNight I guess you're also interested to for downstream support, if you have time to review again, that would be cool :)

sipa

utACK 6983919

src/test/script_tests.cpp

src/script/bitcoinconsensus.h

jrawsthorne · 2021-06-13T13:29:22Z

Thanks for your review @sipa, I've addressed your comments. Also pinging @ariard

luke-jr · 2021-06-23T01:56:04Z

src/script/bitcoinconsensus.cpp

+        std::vector<CTxOut> spent_outputs;
+        if (spentOutputs != nullptr) {
+            TxInputStream spent_outputs_stream(PROTOCOL_VERSION, spentOutputs, spentOutputsLen);
+            spent_outputs_stream >> spent_outputs;


Might be nicer to let the caller pass in an array rather than have to serialise the vector?

Correct me if I'm wrong but I thought it would have to be a vector and that can't be exposed as part of the C API

It could take in a pointer to an array of {pointer to utxo, length} structs or so, as well as the number of inputs. That's not particularly convenient to use, but neither is the current interface (as it probably requires serialization code on the caller side).

luke-jr · 2021-06-23T01:56:52Z

doc/shared-libraries.md

+- `int64_t amount` - The amount spent in the input
+- `const unsigned char *txTo` - The transaction with the input that is spending the previous output.
+- `unsigned int txToLen` - The number of bytes for the `txTo`.
+- `const unsigned char *spentOutputs` - Previous outputs spent in the transaction


This leaves me guessing how to call this function.

Do you want to add something like "serialized as a vector of TxOut" or something more substantial?

DrahtBot · 2021-07-21T10:00:55Z

🐙 This pull request conflicts with the target branch and needs rebase.

_{Want to unsubscribe from rebase notifications on this pull request? Just convert this pull request to a "draft".}

DrahtBot · 2021-12-22T12:28:55Z

There hasn't been much activity lately and the patch still needs rebase. What is the status here?

Is it still relevant? ➡️ Please solve the conflicts to make it ready for review and to ensure the CI passes.
Is it no longer relevant? ➡️ Please close.
Did the author lose interest or time to work on this? ➡️ Please close it and mark it 'Up for grabs' with the label, so that it can be picked up in the future.

maflcko · 2022-04-29T14:17:52Z

Marked "up for grabs"

DrahtBot added the Consensus label Feb 11, 2021

jrawsthorne force-pushed the libconsensus_taproot branch 3 times, most recently from 512c9ca to 883cac2 Compare February 12, 2021 23:38

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DrahtBot mentioned this pull request Mar 2, 2021

Deal with missing data in signature hashes more consistently #21330

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Basic Taproot signing support for descriptor wallets #21365

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cli: create -addrinfo #21595

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jrawsthorne mentioned this pull request May 16, 2021

libbitcoinconsensus.dylib in MacOS releases is broken #21794

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cli: Improve -getinfo return format #21832

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doc: update tor.md, release notes with removal of tor v2 support #22172

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refactor: Rename variables in preparation for generic deserialization

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lib: Add Taproot support to libconsensus

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Eliminate Signature Checker/Creator Ambiguity w/ LIFETIMEBOUND References #22440

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Consider Removing Message Signing #27515

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lib: Add Taproot support to libconsensus #21158

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lib: Add Taproot support to libconsensus #21158

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