musig.h

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// Copyright (c) 2024-present The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or https://www.opensource.org/licenses/mit-license.php.
 
#ifndef BITCOIN_MUSIG_H
#define BITCOIN_MUSIG_H
 
#include <pubkey.h>
 
#include <optional>
#include <vector>
 
struct secp256k1_musig_keyagg_cache;
class MuSig2SecNonceImpl;
struct secp256k1_musig_secnonce;
 
using namespace util::hex_literals;
constexpr uint256 MUSIG_CHAINCODE{
    // Use immediate lambda to work around GCC-14 bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117966
    []() consteval { return uint256{"868087ca02a6f974c4598924c36b57762d32cb45717167e300622c7167e38965"_hex_u8}; }(),
};
 
 
 
constexpr size_t MUSIG2_PUBNONCE_SIZE{66};
 
std::optional<CPubKey> MuSig2AggregatePubkeys(const std::vector<CPubKey>& pubkeys, secp256k1_musig_keyagg_cache& keyagg_cache, const std::optional<CPubKey>& expected_aggregate);
std::optional<CPubKey> MuSig2AggregatePubkeys(const std::vector<CPubKey>& pubkeys);
 
CExtPubKey CreateMuSig2SyntheticXpub(const CPubKey& pubkey);
 
class MuSig2SecNonce
{
private:
    std::unique_ptr<MuSig2SecNonceImpl> m_impl;
 
public:
    MuSig2SecNonce();
    MuSig2SecNonce(MuSig2SecNonce&&) noexcept;
    MuSig2SecNonce& operator=(MuSig2SecNonce&&) noexcept;
    ~MuSig2SecNonce();
 
    // Delete copy constructors
    MuSig2SecNonce(const MuSig2SecNonce&) = delete;
    MuSig2SecNonce& operator=(const MuSig2SecNonce&) = delete;
 
    secp256k1_musig_secnonce* Get() const;
    void Invalidate();
    bool IsValid();
};
 
uint256 MuSig2SessionID(const CPubKey& script_pubkey, const CPubKey& part_pubkey, const uint256& sighash);
 
std::optional<std::vector<uint8_t>> CreateMuSig2AggregateSig(const std::vector<CPubKey>& participants, const CPubKey& aggregate_pubkey, const std::vector<std::pair<uint256, bool>>& tweaks, const uint256& sighash, const std::map<CPubKey, std::vector<uint8_t>>& pubnonces, const std::map<CPubKey, uint256>& partial_sigs);
 
#endif // BITCOIN_MUSIG_H