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sign: Add CreateMuSig2AggregateSig

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This commit is contained in:
Ava Chow
2024-01-29 17:32:49 -05:00
parent bf69442b3f
commit 258db93889
4 changed files with 125 additions and 0 deletions
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35
src/script/sign.cpp
View File

@@ -174,6 +174,36 @@ bool MutableTransactionSignatureCreator::CreateMuSig2PartialSig(const SigningPro
return true;
}
bool MutableTransactionSignatureCreator::CreateMuSig2AggregateSig(const std::vector<CPubKey>& participants, std::vector<uint8_t>& sig, const CPubKey& aggregate_pubkey, const CPubKey& script_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);
if (!participants.size()) return false;
// Retrieve pubnonces and partial sigs
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;
auto partial_sigs_it = sigdata.musig2_partial_sigs.find(this_leaf_aggkey);
if (partial_sigs_it == sigdata.musig2_partial_sigs.end()) return false;
const std::map<CPubKey, uint256>& partial_sigs = partial_sigs_it->second;
// Check if enough pubnonces and partial sigs
if (pubnonces.size() != participants.size()) return false;
if (partial_sigs.size() != participants.size()) return false;
// Compute sighash
std::optional<uint256> sighash = ComputeSchnorrSignatureHash(leaf_hash, sigversion);
if (!sighash.has_value()) return false;
std::optional<std::vector<uint8_t>> res = ::CreateMuSig2AggregateSig(participants, aggregate_pubkey, tweaks, *sighash, pubnonces, partial_sigs);
if (!res) return false;
sig = res.value();
if (nHashType) sig.push_back(nHashType);
return true;
}
static bool GetCScript(const SigningProvider& provider, const SignatureData& sigdata, const CScriptID& scriptid, CScript& script)
{
if (provider.GetCScript(scriptid, script)) {
@@ -840,6 +870,11 @@ public:
partial_sig = uint256::ONE;
return true;
}
bool CreateMuSig2AggregateSig(const std::vector<CPubKey>& participants, std::vector<uint8_t>& sig, const CPubKey& aggregate_pubkey, const CPubKey& script_pubkey, const uint256* leaf_hash, const std::vector<std::pair<uint256, bool>>& tweaks, SigVersion sigversion, const SignatureData& sigdata) const override
{
sig.assign(64, '\000');
return true;
}
};
}

2
src/script/sign.h
View File

@@ -36,6 +36,7 @@ public:
virtual bool CreateSchnorrSig(const SigningProvider& provider, std::vector<unsigned char>& sig, const XOnlyPubKey& pubkey, const uint256* leaf_hash, const uint256* merkle_root, SigVersion sigversion) const =0;
virtual std::vector<uint8_t> CreateMuSig2Nonce(const SigningProvider& provider, const CPubKey& aggregate_pubkey, const CPubKey& script_pubkey, const CPubKey& part_pubkey, const uint256* leaf_hash, const uint256* merkle_root, SigVersion sigversion, const SignatureData& sigdata) const =0;
virtual 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 =0;
virtual bool CreateMuSig2AggregateSig(const std::vector<CPubKey>& participants, std::vector<uint8_t>& sig, const CPubKey& aggregate_pubkey, const CPubKey& script_pubkey, const uint256* leaf_hash, const std::vector<std::pair<uint256, bool>>& tweaks, SigVersion sigversion, const SignatureData& sigdata) const =0;
};
/** A signature creator for transactions. */
@@ -58,6 +59,7 @@ public:
bool CreateSchnorrSig(const SigningProvider& provider, std::vector<unsigned char>& sig, const XOnlyPubKey& pubkey, const uint256* leaf_hash, const uint256* merkle_root, SigVersion sigversion) const override;
std::vector<uint8_t> CreateMuSig2Nonce(const SigningProvider& provider, const CPubKey& aggregate_pubkey, const CPubKey& script_pubkey, const CPubKey& part_pubkey, const uint256* leaf_hash, const uint256* merkle_root, SigVersion sigversion, const SignatureData& sigdata) const override;
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;
bool CreateMuSig2AggregateSig(const std::vector<CPubKey>& participants, std::vector<uint8_t>& sig, const CPubKey& aggregate_pubkey, const CPubKey& script_pubkey, const uint256* leaf_hash, const std::vector<std::pair<uint256, bool>>& tweaks, SigVersion sigversion, const SignatureData& sigdata) const override;
};
/** A signature checker that accepts all signatures */