1 files changed, 30 insertions, 0 deletions
diff --git a/src/script/sigcache.h b/src/script/sigcache.h
new file mode 100644
index 000000000..226997256
--- /dev/null
+++ b/src/script/sigcache.h
@@ -0,0 +1,30 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2014 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 <vector>
+
+// DoS prevention: limit cache size to less than 40MB (over 500000
+// entries on 64-bit systems).
+static const unsigned int DEFAULT_MAX_SIG_CACHE_SIZE = 40;
+
+class CPubKey;
+
+class CachingTransactionSignatureChecker : public TransactionSignatureChecker
+{
+private:
+    bool store;
+
+public:
+    CachingTransactionSignatureChecker(const CTransaction* txToIn, unsigned int nInIn, bool storeIn=true) : TransactionSignatureChecker(txToIn, nInIn), store(storeIn) {}
+
+    bool VerifySignature(const std::vector<unsigned char>& vchSig, const CPubKey& vchPubKey, const uint256& sighash) const;
+};
+
+#endif // BITCOIN_SCRIPT_SIGCACHE_H