From 3dd410294d42f251e4808ef1dfcfcd64817edbac Mon Sep 17 00:00:00 2001
From: Pieter Wuille <pieter.wuille@gmail.com>
Date: Sun, 27 Dec 2015 19:49:08 +0100
Subject: BIP143: Verification logic

Includes simplifications by Eric Lombrozo.
---
 src/script/interpreter.h | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

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

diff --git a/src/script/interpreter.h b/src/script/interpreter.h
index 6f13e75d7..864372942 100644
--- a/src/script/interpreter.h
+++ b/src/script/interpreter.h
@@ -98,12 +98,18 @@ enum
 
 bool CheckSignatureEncoding(const std::vector<unsigned char> &vchSig, unsigned int flags, ScriptError* serror);
 
-uint256 SignatureHash(const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType);
+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);
 
 class BaseSignatureChecker
 {
 public:
-    virtual bool CheckSig(const std::vector<unsigned char>& scriptSig, const std::vector<unsigned char>& vchPubKey, const CScript& scriptCode) const
+    virtual bool CheckSig(const std::vector<unsigned char>& scriptSig, const std::vector<unsigned char>& vchPubKey, const CScript& scriptCode, SigVersion sigversion) const
     {
         return false;
     }
@@ -126,13 +132,14 @@ class TransactionSignatureChecker : public BaseSignatureChecker
 private:
     const CTransaction* txTo;
     unsigned int nIn;
+    const CAmount amount;
 
 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& amount) : txTo(txToIn), nIn(nInIn) {}
-    bool CheckSig(const std::vector<unsigned char>& scriptSig, const std::vector<unsigned char>& vchPubKey, const CScript& scriptCode) const;
+    TransactionSignatureChecker(const CTransaction* txToIn, unsigned int nInIn, const CAmount& amountIn) : txTo(txToIn), nIn(nInIn), amount(amountIn) {}
+    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;
 };
@@ -146,7 +153,7 @@ public:
     MutableTransactionSignatureChecker(const CMutableTransaction* txToIn, unsigned int nInIn, const CAmount& amount) : TransactionSignatureChecker(&txTo, nInIn, amount), txTo(*txToIn) {}
 };
 
-bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, unsigned int flags, const BaseSignatureChecker& checker, ScriptError* error = NULL);
+bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, unsigned int flags, const BaseSignatureChecker& checker, SigVersion sigversion, ScriptError* error = NULL);
 bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CScriptWitness* witness, unsigned int flags, const BaseSignatureChecker& checker, ScriptError* serror = NULL);
 
 #endif // BITCOIN_SCRIPT_INTERPRETER_H
-- 
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