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56 lines
1.9 KiB
56 lines
1.9 KiB
// Copyright (c) 2009-2010 Satoshi Nakamoto |
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// Copyright (c) 2009-2017 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 override; |
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}; |
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void InitSignatureCache(); |
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#endif // BITCOIN_SCRIPT_SIGCACHE_H
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