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121 lines
4.2 KiB
121 lines
4.2 KiB
// Copyright (c) 2021, The Monero Project
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#pragma once
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#include "ringct/rctTypes.h"
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#include <set>
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#include <vector>
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namespace cryptonote {
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class transaction;
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struct tx_source_entry;
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struct tx_destination_entry;
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struct account_keys;
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}
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namespace multisig {
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namespace signing {
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class CLSAG_context_t;
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// number of parallel signing nonces to use per signer (2 nonces as in musig2 and FROST)
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constexpr std::size_t kAlphaComponents = 2;
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class tx_builder_ringct_t final {
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private:
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// the tx builder has been initialized
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bool initialized;
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// the tx builder is 'reconstructing' a tx that has already been created using this object
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bool reconstruction;
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// cached: mu_P*(local keys and sender-receiver secret and subaddress material) + mu_C*(commitment-to-zero secret)
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// - these are only used for the initial building of a tx (not reconstructions)
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rct::keyV cached_w;
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// contexts for making CLSAG challenges with multisig nonces
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std::vector<CLSAG_context_t> CLSAG_contexts;
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public:
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tx_builder_ringct_t();
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~tx_builder_ringct_t();
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// prepare an unsigned transaction (and get tx privkeys for outputs)
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bool init(
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const cryptonote::account_keys& account_keys,
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const std::vector<std::uint8_t>& extra,
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const std::uint64_t unlock_time,
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const std::uint32_t subaddr_account,
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const std::set<std::uint32_t>& subaddr_minor_indices,
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std::vector<cryptonote::tx_source_entry>& sources,
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std::vector<cryptonote::tx_destination_entry>& destinations,
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const cryptonote::tx_destination_entry& change,
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const rct::RCTConfig& rct_config,
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const bool use_rct,
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const bool reconstruction,
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crypto::secret_key& tx_secret_key,
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std::vector<crypto::secret_key>& tx_aux_secret_keys,
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crypto::secret_key& tx_secret_key_entropy,
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cryptonote::transaction& unsigned_tx
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);
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// get the first partial signature for the specified input ('source')
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bool first_partial_sign(
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const std::size_t source,
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const rct::keyV& total_alpha_G,
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const rct::keyV& total_alpha_H,
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const rct::keyV& alpha,
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rct::key& c_0,
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rct::key& s
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);
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// get intermediate partial signatures for all the inputs
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bool next_partial_sign(
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const rct::keyM& total_alpha_G,
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const rct::keyM& total_alpha_H,
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const rct::keyM& alpha,
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const rct::key& x,
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rct::keyV& c_0,
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rct::keyV& s
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);
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// finalize an unsigned transaction (add challenges and real responses to incomplete CLSAG signatures)
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static bool finalize_tx(
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const std::vector<cryptonote::tx_source_entry>& sources,
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const rct::keyV& c_0,
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const rct::keyV& s,
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cryptonote::transaction& unsigned_tx
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);
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};
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} //namespace signing
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} //namespace multisig
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