There are a few layers of bullshit to this PR.
First, there is the fact that it adds a functional test gated on a new
config flag which is disabled by default, so it actually adds broken
code with no tests, waiting to ruin your day 520 PRs later when #21935
enables the broken test.
Second, the test appears to be superficially nonsensical because it
generates two transactions from different wallets and tries to compare
them for byte-for-byte equality, which doesn't make sense (at least)
because change outputs are randomly located...so something fishy is
going on.
Of course, in Elements the transactions are *not* equal half the time
because the outputs are permuted, which may have let me quickly figure
out the issue, except...
Third, there is a red herring of a bug where the two transactions have
slightly different feerates. This turns out to be caused by
CWallet::CalculateMaximumSignedTxSize using differently sized dummy
transactions depending on whether watchonly outputs are included (this
fact is conveniently disguised by #17211 slightly changing this logic;
this is an unmerged PR in Core that Elements has a backport of an old
version of). And the two wallets have different watchonly settings.
A sub-red-herring is the fact that this bug results in a discrepancy
of 0.25 vbytes, so it does not appear in Core but does appear in
Elements (there is a 3/16 probability that we should be so unlucky...
we are).
But this is all irrelevant, because...
Fourth, this test is actually super bullshit. The way it works is by
constructing a PSBT legitimately, saving this to disk, then re-"signs"
using the external signer interface by using a mock signer that
COMPLETELY REPLACES THE TRANSACTION UNDER CONSTRUCTION. So it doesn't
matter what the fee output looks like and it doesn't matter what the
order of the outputs. Core does not detect this malfeasance and
neither does Elements. For some reason, Core has a functional test
that explicitly checks that you can do this even though it is insane
and it is hard to think of non-malicious reasons to do it.
Fifth, while Elements fails to detect that its external signer is
actually changing the transaction out from under it, it DOES assume
that this won't happen. In CWallet::SignPSBT it blithely un-replaces
the transaction, which undermines the functional test.
Sixth, the original PR where this test was introduced has comments
locked, so anyone who spent six hours reverse-engineering this idiotic
broken test, and is still feeling charitable enough to discuss it with
the Core developors, can go pound sand.
Anyway, just disabled the broken test and move on with our lives.
Instead of having a large blob of cache merging code in TopUp, refactor
this into DescriptorCache so that it can merge and provide a diff
(another DescriptorCache containing just the items that were added).
Then TopUp can just write everything that was in the diff.
Adds an error output parameter to all GetReservedDestination functions
so that callers can get the actual reason that a change address could
not be fetched. This more closely matches GetNewDestination. This allows
for more granular error messages, such as one that indicates that
bech32m addresses cannot be generated yet.
We don't want the legacy wallet to ever have bech32m addresses so don't
allow importing them. This includes addmultisigaddress as that is a
legacy wallet only RPC
Additionally, bech32m multisigs are not available yet, so disallow them
in createmultisig.
Bech32m addresses need their own OutputType
We are not ready to create DescriptorScriptPubKeyMans which produce
bech32m addresses. So don't allow generating them.
458a345b05 Add support for SIGHASH_DEFAULT in RPCs, and make it default (Pieter Wuille)
c0f0c8eccb tests: check spending of P2TR (Pieter Wuille)
a2380127e9 Basic Taproot signing logic in script/sign.cpp (Pieter Wuille)
49487bc3b6 Make GetInputUTXO safer: verify non-witness UTXO match (Pieter Wuille)
fd3f6890f3 Construct and use PrecomputedTransactionData in PSBT signing (Pieter Wuille)
5cb6502ac5 Construct and use PrecomputedTransactionData in SignTransaction (Pieter Wuille)
5d2e22437b Don't nuke witness data when signing fails (Pieter Wuille)
ce9353164b Permit full precomputation in PrecomputedTransactionData (Pieter Wuille)
e841fb503d Add precomputed txdata support to MutableTransactionSignatureCreator (Pieter Wuille)
a91d532338 Add CKey::SignSchnorr function for BIP 340/341 signing (Pieter Wuille)
e77a2839b5 Use HandleMissingData also in CheckSchnorrSignature (Pieter Wuille)
dbb0ce9fbf Add TaprootSpendData data structure, equivalent to script map for P2[W]SH (Pieter Wuille)
Pull request description:
Builds on top of #22051, adding signing support after derivation support.
Nothing is changed in descriptor features. Signing works for key path and script path spending, through the normal sending functions, and PSBT-based RPCs. However, PSBT usability is rather low as no extensions have been defined to convey Taproot-specific information, so all script information must be known to the signing wallet.
ACKs for top commit:
achow101:
re-ACK 458a345b05
fjahr:
Code review ACK 458a345b05
Sjors:
ACK 458a345b05
Tree-SHA512: 30ed212cf7754763a4a81624ebc084c51727b8322711ac0b390369213c1a891d367ed8b123882ac08c99595320c11ec57ee42304ff22a69afdc3d1a0d55cc711
This commit moves the ExternalSigner class and RPC methods out of the wallet module.
The enumeratesigners RPC can be used without a wallet since #21417.
With additional modifications external signers could be used without a wallet in general, e.g. via signrawtransaction.
The signerdisplayaddress RPC is ranamed to walletdisplayaddress because it requires wallet context.
A future displayaddress RPC call without wallet context could take a descriptor argument.
This commit fixes a rpc_help.py failure when configured with --disable-wallet.
de6b389d5d tests: Test getaddressinfo parent_desc (Andrew Chow)
e4ac869a0a rpc: Add parent descriptor to getaddressinfo output (Andrew Chow)
bbe4a36152 wallet: Add GetDescriptorString to DescriptorScriptPubKeyMan (Andrew Chow)
9be1437c49 descriptors: Add ToNormalizedString and tests (Andrew Chow)
Pull request description:
Adds `parent_desc` field to the `getaddressinfo` RPC to export a public descriptor. Using the given address, `getaddressinfo` will look up which `DescriptorScriptPubKeyMan` can be used to produce that address. It will then return the descriptor for that `DescriptorScriptPubKeyMan` in the `parent_desc` field. The descriptor will be in a normalized form where the xpub at the last hardened step is derived so that the descriptor can be imported to other wallets. Tests are added to check that the correct descriptor is being returned for the wallet's addresses and that these descriptors can be imported and used in other wallets.
As part of this PR, a `ToNormalizedString` function is added to the descriptor classes. This really only has an effect on `BIP32PubkeyProvider`s that have hardened derivation steps. Tests are added to check that normalized descriptors are returned.
ACKs for top commit:
Sjors:
utACK de6b389d5d
S3RK:
Tested ACK de6b389
jonatack:
Tested ACK de6b389d5d modulo a few minor comments
fjahr:
Code review ACK de6b389d5d
meshcollider:
Tested ACK de6b389d5d
Tree-SHA512: a633e4a39f2abbd95afd7488484cfa66fdd2651dac59fe59f2b80a0940a2a4a13acf889c534a6948903d701484a2ba1218e3081feafe0b9a720dccfa9e43ca2b
fa650ca7f1 Use -Wswitch for TxoutType where possible (MarcoFalke)
fa59e0b5bd test: Add missing script_standard_Solver_success cases (MarcoFalke)
Pull request description:
This removes unused `default:` cases for all `switch` statements on `TxoutType` and adds the cases (`MULTISIG`, `NULL_DATA`, `NONSTANDARD`) to `ExtractDestination` for clarity.
Also, the compiler is now able to use `-Wswitch`.
ACKs for top commit:
practicalswift:
cr ACK fa650ca7f1: patch looks correct and `assert(false);` is better than UB :)
hebasto:
ACK fa650ca7f1, I have reviewed the code and it looks OK, I agree it can be merged.
Tree-SHA512: 282458b6523bd8923a0c0f5c423d1db2dce2a2d1b1d1dae455415c6fc995bb41ce82c1f9b0a1c0dcc6d874d171e04c30eca585f147582f52c7048c140358630a
Also re-`static`'d a method in src/script/standard.cpp which we had made globally
visible for some historical reason, but which I noticed diffing that file against
upstream.
