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// Copyright (c) 2021, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 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
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#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
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