git / moonbite-core / src/script/sigcache.h · raw

// Copyright (c) 2009-2010 Satoshi Nakamoto// Copyright (c) 2009-2018 The Bitcoin Core developers// Distributed under the MIT software license, see the accompanying// file COPYING or http://www.opensource.org/licenses/mit-license.php.#ifndef BITCOIN_SCRIPT_SIGCACHE_H#define BITCOIN_SCRIPT_SIGCACHE_H#include <script/interpreter.h>#include <span.h>#include <vector>// DoS prevention: limit cache size to 32MB (over 1000000 entries on 64-bit// systems). Due to how we count cache size, actual memory usage is slightly// more (~32.25 MB)static const unsigned int DEFAULT_MAX_SIG_CACHE_SIZE = 32;// Maximum sig cache size allowedstatic const int64_t MAX_MAX_SIG_CACHE_SIZE = 16384;class CPubKey;/** * We're hashing a nonce into the entries themselves, so we don't need extra * blinding in the set hash computation. * * This may exhibit platform endian dependent behavior but because these are * nonced hashes (random) and this state is only ever used locally it is safe. * All that matters is local consistency. */class SignatureCacheHasher{public:    template <uint8_t hash_select>    uint32_t operator()(const uint256& key) const    {        static_assert(hash_select <8, "SignatureCacheHasher only has 8 hashes available.");        uint32_t u;        std::memcpy(&u, key.begin()+4*hash_select, 4);        return u;    }};class CachingTransactionSignatureChecker : public TransactionSignatureChecker{private:    bool store;public:    CachingTransactionSignatureChecker(const CTransaction* txToIn, unsigned int nInIn, const CAmount& amountIn, bool storeIn, PrecomputedTransactionData& txdataIn) : TransactionSignatureChecker(txToIn, nInIn, amountIn, txdataIn), store(storeIn) {}    bool VerifyECDSASignature(const std::vector<unsigned char>& vchSig, const CPubKey& vchPubKey, const uint256& sighash) const override;    bool VerifySchnorrSignature(Span<const unsigned char> sig, const XOnlyPubKey& pubkey, const uint256& sighash) const override;};void InitSignatureCache();#endif // BITCOIN_SCRIPT_SIGCACHE_H