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musig: Move synthetic xpub construction to its own function

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This commit is contained in:
Ava Chow 2025-09-16 16:09:31 -07:00
parent fb8720f1e0
commit f14876213a
3 changed files with 15 additions and 7 deletions
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11
src/musig.cpp
View File

@ -51,3 +51,14 @@ std::optional<CPubKey> MuSig2AggregatePubkeys(const std::vector<CPubKey>& pubkey
}
return GetCPubKeyFromMuSig2KeyAggCache(keyagg_cache);
}
CExtPubKey CreateMuSig2SyntheticXpub(const CPubKey& pubkey)
{
CExtPubKey extpub;
extpub.nDepth = 0;
std::memset(extpub.vchFingerprint, 0, 4);
extpub.nChild = 0;
extpub.chaincode = MUSIG_CHAINCODE;
extpub.pubkey = pubkey;
return extpub;
}

3
src/musig.h
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@ -23,4 +23,7 @@ std::optional<CPubKey> GetCPubKeyFromMuSig2KeyAggCache(secp256k1_musig_keyagg_ca
//! Compute the full aggregate pubkey from the given participant pubkeys in their current order
std::optional<CPubKey> MuSig2AggregatePubkeys(const std::vector<CPubKey>& pubkeys);
//! Construct the BIP 328 synthetic xpub for a pubkey
CExtPubKey CreateMuSig2SyntheticXpub(const CPubKey& pubkey);
#endif // BITCOIN_MUSIG_H

8
src/script/descriptor.cpp
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@ -641,13 +641,7 @@ public:
// Make our pubkey provider
if (IsRangedDerivation() || !m_path.empty()) {
// Make the synthetic xpub and construct the BIP32PubkeyProvider
CExtPubKey extpub;
extpub.nDepth = 0;
std::memset(extpub.vchFingerprint, 0, 4);
extpub.nChild = 0;
extpub.chaincode = MUSIG_CHAINCODE;
extpub.pubkey = m_aggregate_pubkey.value();
CExtPubKey extpub = CreateMuSig2SyntheticXpub(m_aggregate_pubkey.value());
m_aggregate_provider = std::make_unique<BIP32PubkeyProvider>(m_expr_index, extpub, m_path, m_derive, /*apostrophe=*/false);
} else {
m_aggregate_provider = std::make_unique<ConstPubkeyProvider>(m_expr_index, m_aggregate_pubkey.value(), /*xonly=*/false);