From b8c79a057c48c871a5e48bdcdf600fbfe68f656b Mon Sep 17 00:00:00 2001
From: Pieter Wuille <pieter.wuille@gmail.com>
Date: Tue, 16 Aug 2016 15:35:45 +0200
Subject: Precompute sighashes

Original version by Nicolas Dorier. Precomputing version by Pieter Wuille.
---
 src/script/interpreter.h | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

(limited to 'src/script/interpreter.h')

diff --git a/src/script/interpreter.h b/src/script/interpreter.h
index bd2f211663..e5d7865cd3 100644
--- a/src/script/interpreter.h
+++ b/src/script/interpreter.h
@@ -98,13 +98,20 @@ enum
 
 bool CheckSignatureEncoding(const std::vector<unsigned char> &vchSig, unsigned int flags, ScriptError* serror);
 
+struct PrecomputedTransactionData
+{
+    uint256 hashPrevouts, hashSequence, hashOutputs;
+
+    PrecomputedTransactionData(const CTransaction& tx);
+};
+
 enum SigVersion
 {
     SIGVERSION_BASE = 0,
     SIGVERSION_WITNESS_V0 = 1,
 };
 
-uint256 SignatureHash(const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType, const CAmount& amount, SigVersion sigversion);
+uint256 SignatureHash(const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType, const CAmount& amount, SigVersion sigversion, const PrecomputedTransactionData* cache = NULL);
 
 class BaseSignatureChecker
 {
@@ -133,12 +140,14 @@ private:
     const CTransaction* txTo;
     unsigned int nIn;
     const CAmount amount;
+    const PrecomputedTransactionData* txdata;
 
 protected:
     virtual bool VerifySignature(const std::vector<unsigned char>& vchSig, const CPubKey& vchPubKey, const uint256& sighash) const;
 
 public:
-    TransactionSignatureChecker(const CTransaction* txToIn, unsigned int nInIn, const CAmount& amountIn) : txTo(txToIn), nIn(nInIn), amount(amountIn) {}
+    TransactionSignatureChecker(const CTransaction* txToIn, unsigned int nInIn, const CAmount& amountIn) : txTo(txToIn), nIn(nInIn), amount(amountIn), txdata(NULL) {}
+    TransactionSignatureChecker(const CTransaction* txToIn, unsigned int nInIn, const CAmount& amountIn, const PrecomputedTransactionData& txdataIn) : txTo(txToIn), nIn(nInIn), amount(amountIn), txdata(&txdataIn) {}
     bool CheckSig(const std::vector<unsigned char>& scriptSig, const std::vector<unsigned char>& vchPubKey, const CScript& scriptCode, SigVersion sigversion) const;
     bool CheckLockTime(const CScriptNum& nLockTime) const;
     bool CheckSequence(const CScriptNum& nSequence) const;
-- 
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