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sign: Add CreateMuSig2PartialSig

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This commit is contained in:
Ava Chow
2024-02-05 16:44:03 -05:00
parent 512b17fc56
commit bf69442b3f
4 changed files with 141 additions and 0 deletions
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49
src/script/sign.cpp
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@@ -130,6 +130,50 @@ std::vector<uint8_t> MutableTransactionSignatureCreator::CreateMuSig2Nonce(const
return out;
}
bool MutableTransactionSignatureCreator::CreateMuSig2PartialSig(const SigningProvider& provider, uint256& partial_sig, const CPubKey& aggregate_pubkey, const CPubKey& script_pubkey, const CPubKey& part_pubkey, const uint256* leaf_hash, const std::vector<std::pair<uint256, bool>>& tweaks, SigVersion sigversion, const SignatureData& sigdata) const
{
assert(sigversion == SigVersion::TAPROOT || sigversion == SigVersion::TAPSCRIPT);
// Retrieve private key
CKey key;
if (!provider.GetKey(part_pubkey.GetID(), key)) return false;
// Retrieve participant pubkeys
auto it = sigdata.musig2_pubkeys.find(aggregate_pubkey);
if (it == sigdata.musig2_pubkeys.end()) return false;
const std::vector<CPubKey>& pubkeys = it->second;
if (std::find(pubkeys.begin(), pubkeys.end(), part_pubkey) == pubkeys.end()) return {};
// Retrieve pubnonces
auto this_leaf_aggkey = std::make_pair(script_pubkey, leaf_hash ? *leaf_hash : uint256());
auto pubnonce_it = sigdata.musig2_pubnonces.find(this_leaf_aggkey);
if (pubnonce_it == sigdata.musig2_pubnonces.end()) return false;
const std::map<CPubKey, std::vector<uint8_t>>& pubnonces = pubnonce_it->second;
// Check if enough pubnonces
if (pubnonces.size() != pubkeys.size()) return false;
// Compute sighash
std::optional<uint256> sighash = ComputeSchnorrSignatureHash(leaf_hash, sigversion);
if (!sighash.has_value()) return false;
// Retrieve the secnonce
uint256 session_id = MuSig2SessionID(script_pubkey, part_pubkey, *sighash);
std::optional<std::reference_wrapper<MuSig2SecNonce>> secnonce = provider.GetMuSig2SecNonce(session_id);
if (!secnonce || !secnonce->get().IsValid()) return false;
// Compute the sig
std::optional<uint256> sig = key.CreateMuSig2PartialSig(*sighash, aggregate_pubkey, pubkeys, pubnonces, *secnonce, tweaks);
if (!sig) return false;
partial_sig = std::move(*sig);
// Delete the secnonce now that we're done with it
assert(!secnonce->get().IsValid());
provider.DeleteMuSig2Session(session_id);
return true;
}
static bool GetCScript(const SigningProvider& provider, const SignatureData& sigdata, const CScriptID& scriptid, CScript& script)
{
if (provider.GetCScript(scriptid, script)) {
@@ -791,6 +835,11 @@ public:
out.assign(MUSIG2_PUBNONCE_SIZE, '\000');
return out;
}
bool CreateMuSig2PartialSig(const SigningProvider& provider, uint256& partial_sig, const CPubKey& aggregate_pubkey, const CPubKey& script_pubkey, const CPubKey& part_pubkey, const uint256* leaf_hash, const std::vector<std::pair<uint256, bool>>& tweaks, SigVersion sigversion, const SignatureData& sigdata) const override
{
partial_sig = uint256::ONE;
return true;
}
};
}