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Add TaprootSpendData data structure, equivalent to script map for P2[W]SH

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This data structures stores all information necessary for spending a taproot
output (the internal key, the Merkle root, and the control blocks for every
script leaf).

It is added to signing providers, and populated by the tr() descriptor.
This commit is contained in:
Pieter Wuille 2021-03-03 15:02:56 -08:00
parent b0e5fbf6fa
commit dbb0ce9fbf
6 changed files with 109 additions and 7 deletions
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13
src/script/signingprovider.cpp
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@ -44,6 +44,11 @@ bool HidingSigningProvider::GetKeyOrigin(const CKeyID& keyid, KeyOriginInfo& inf
return m_provider->GetKeyOrigin(keyid, info);
}
bool HidingSigningProvider::GetTaprootSpendData(const XOnlyPubKey& output_key, TaprootSpendData& spenddata) const
{
return m_provider->GetTaprootSpendData(output_key, spenddata);
}
bool FlatSigningProvider::GetCScript(const CScriptID& scriptid, CScript& script) const { return LookupHelper(scripts, scriptid, script); }
bool FlatSigningProvider::GetPubKey(const CKeyID& keyid, CPubKey& pubkey) const { return LookupHelper(pubkeys, keyid, pubkey); }
bool FlatSigningProvider::GetKeyOrigin(const CKeyID& keyid, KeyOriginInfo& info) const
@ -54,6 +59,10 @@ bool FlatSigningProvider::GetKeyOrigin(const CKeyID& keyid, KeyOriginInfo& info)
return ret;
}
bool FlatSigningProvider::GetKey(const CKeyID& keyid, CKey& key) const { return LookupHelper(keys, keyid, key); }
bool FlatSigningProvider::GetTaprootSpendData(const XOnlyPubKey& output_key, TaprootSpendData& spenddata) const
{
return LookupHelper(tr_spenddata, output_key, spenddata);
}
FlatSigningProvider Merge(const FlatSigningProvider& a, const FlatSigningProvider& b)
{
@ -66,6 +75,10 @@ FlatSigningProvider Merge(const FlatSigningProvider& a, const FlatSigningProvide
ret.keys.insert(b.keys.begin(), b.keys.end());
ret.origins = a.origins;
ret.origins.insert(b.origins.begin(), b.origins.end());
ret.tr_spenddata = a.tr_spenddata;
for (const auto& [output_key, spenddata] : b.tr_spenddata) {
ret.tr_spenddata[output_key].Merge(spenddata);
}
return ret;
}