57 lines
1.9 KiB
C++
57 lines
1.9 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2016 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_SCRIPT_SIGCACHE_H
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#define BITCOIN_SCRIPT_SIGCACHE_H
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#include "script/interpreter.h"
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#include <vector>
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// DoS prevention: limit cache size to 32MB (over 1000000 entries on 64-bit
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// systems). Due to how we count cache size, actual memory usage is slightly
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// more (~32.25 MB)
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static const unsigned int DEFAULT_MAX_SIG_CACHE_SIZE = 32;
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// Maximum sig cache size allowed
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static const int64_t MAX_MAX_SIG_CACHE_SIZE = 16384;
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class CPubKey;
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/**
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* We're hashing a nonce into the entries themselves, so we don't need extra
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* blinding in the set hash computation.
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*
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* This may exhibit platform endian dependent behavior but because these are
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* nonced hashes (random) and this state is only ever used locally it is safe.
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* All that matters is local consistency.
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*/
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class SignatureCacheHasher
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{
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public:
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template <uint8_t hash_select>
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uint32_t operator()(const uint256& key) const
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{
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static_assert(hash_select <8, "SignatureCacheHasher only has 8 hashes available.");
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uint32_t u;
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std::memcpy(&u, key.begin()+4*hash_select, 4);
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return u;
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}
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};
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class CachingTransactionSignatureChecker : public TransactionSignatureChecker
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{
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private:
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bool store;
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public:
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CachingTransactionSignatureChecker(const CTransaction* txToIn, unsigned int nInIn, const CAmount& amountIn, bool storeIn, PrecomputedTransactionData& txdataIn) : TransactionSignatureChecker(txToIn, nInIn, amountIn, txdataIn), store(storeIn) {}
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bool VerifySignature(const std::vector<unsigned char>& vchSig, const CPubKey& vchPubKey, const uint256& sighash) const;
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};
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void InitSignatureCache();
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#endif // BITCOIN_SCRIPT_SIGCACHE_H
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