// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2021 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 <util/hasher.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 allowed
static const int64_t MAX_MAX_SIG_CACHE_SIZE = 16384;

class CPubKey;

class CachingTransactionSignatureChecker : public TransactionSignatureChecker
{
private:
    bool store;

public:
    CachingTransactionSignatureChecker(const CTransaction* txToIn, unsigned int nInIn, const CAmount& amount, PrecomputedTransactionData& txdataIn, bool storeIn=true) : TransactionSignatureChecker(txToIn, nInIn, amount, txdataIn, MissingDataBehavior::ASSERT_FAIL), store(storeIn) {}

    bool VerifySignature(const std::vector<unsigned char>& vchSig, const CPubKey& vchPubKey, const uint256& sighash) const override;
};

void InitSignatureCache();

#endif // BITCOIN_SCRIPT_SIGCACHE_H
