// Copyright (c) 2021, The Monero Project
//
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// permitted provided that the following conditions are met:
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
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#pragma once
#include "ringct/rctTypes.h"
#include <set>
#include <vector>
namespace cryptonote {
class transaction;
struct tx_source_entry;
struct tx_destination_entry;
struct account_keys;
}
namespace multisig {
namespace signing {
class CLSAG_context_t;
// number of parallel signing nonces to use per signer (2 nonces as in musig2 and FROST)
constexpr std::size_t kAlphaComponents = 2;
class tx_builder_ringct_t final {
private:
// the tx builder has been initialized
bool initialized;
// the tx builder is 'reconstructing' a tx that has already been created using this object
bool reconstruction;
// cached: mu_P*(local keys and sender-receiver secret and subaddress material) + mu_C*(commitment-to-zero secret)
// - these are only used for the initial building of a tx (not reconstructions)
rct::keyV cached_w;
// contexts for making CLSAG challenges with multisig nonces
std::vector<CLSAG_context_t> CLSAG_contexts;
public:
tx_builder_ringct_t();
~tx_builder_ringct_t();
// prepare an unsigned transaction (and get tx privkeys for outputs)
bool init(
const cryptonote::account_keys& account_keys,
const std::vector<std::uint8_t>& extra,
const std::uint64_t unlock_time,
const std::uint32_t subaddr_account,
const std::set<std::uint32_t>& subaddr_minor_indices,
std::vector<cryptonote::tx_source_entry>& sources,
std::vector<cryptonote::tx_destination_entry>& destinations,
const cryptonote::tx_destination_entry& change,
const rct::RCTConfig& rct_config,
const bool use_rct,
const bool reconstruction,
crypto::secret_key& tx_secret_key,
std::vector<crypto::secret_key>& tx_aux_secret_keys,
crypto::secret_key& tx_secret_key_entropy,
cryptonote::transaction& unsigned_tx
);
// get the first partial signature for the specified input ('source')
bool first_partial_sign(
const std::size_t source,
const rct::keyV& total_alpha_G,
const rct::keyV& total_alpha_H,
const rct::keyV& alpha,
rct::key& c_0,
rct::key& s
);
// get intermediate partial signatures for all the inputs
bool next_partial_sign(
const rct::keyM& total_alpha_G,
const rct::keyM& total_alpha_H,
const rct::keyM& alpha,
const rct::key& x,
rct::keyV& c_0,
rct::keyV& s
);
// finalize an unsigned transaction (add challenges and real responses to incomplete CLSAG signatures)
static bool finalize_tx(
const std::vector<cryptonote::tx_source_entry>& sources,
const rct::keyV& c_0,
const rct::keyV& s,
cryptonote::transaction& unsigned_tx
);
};
} //namespace signing
} //namespace multisig
