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79 lines
3.8 KiB
79 lines
3.8 KiB
// Copyright (c) 2023, 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 "common/data_cache.h"
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#include "cryptonote_basic/cryptonote_basic.h"
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namespace cryptonote
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{
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// Modifying this value should not affect consensus. You can adjust it for performance needs
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static constexpr const size_t RCT_VER_CACHE_SIZE = 8192;
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using rct_ver_cache_t = ::tools::data_cache<::crypto::hash, RCT_VER_CACHE_SIZE>;
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/**
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* @brief Cached version of rct::verRctNonSemanticsSimple
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*
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* This function will not affect how the transaction is serialized and it will never modify the
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* transaction prefix.
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*
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* The reference to tx is mutable since the transaction's ring signatures may be expanded by
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* Blockchain::expand_transaction_2. However, on cache hits, the transaction will not be
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* expanded. This means that the caller does not need to call expand_transaction_2 on this
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* transaction before passing it; the transaction will not successfully verify with "old" RCT data
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* if the transaction has been otherwise modified since the last verification.
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*
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* But, if cryptonote::get_transaction_hash(tx) returns a "stale" hash, this function is not
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* guaranteed to work. So make sure that the cryptonote::transaction passed has not had
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* modifications to it since the last time its hash was fetched without properly invalidating the
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* hashes.
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*
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* rct_type_to_cache can be any RCT version value as long as rct::verRctNonSemanticsSimple works for
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* this RCT version, but for most applications, it doesn't make sense to not make this version
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* the "current" RCT version (i.e. the version that transactions in the mempool are).
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*
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* @param tx transaction which contains RCT signature to verify
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* @param mix_ring mixring referenced by this tx. THIS DATA MUST BE PREVIOUSLY VALIDATED
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* @param cache saves tx+mixring hashes used to cache calls
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* @param rct_type_to_cache Only RCT sigs with version (e.g. RCTTypeBulletproofPlus) will be cached
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* @return true when verRctNonSemanticsSimple() w/ expanded tx.rct_signatures would return true
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* @return false when verRctNonSemanticsSimple() w/ expanded tx.rct_signatures would return false
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*/
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bool ver_rct_non_semantics_simple_cached
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(
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transaction& tx,
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const rct::ctkeyM& mix_ring,
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rct_ver_cache_t& cache,
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std::uint8_t rct_type_to_cache
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);
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} // namespace cryptonote
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