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Abstract out SignatureChecker

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This commit is contained in:
Pieter Wuille 2014-09-10 14:42:22 +02:00
parent 6faee79426
commit c7829ea797
4 changed files with 37 additions and 14 deletions
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17
src/script/interpreter.cpp
View file

@ -132,7 +132,7 @@ bool IsCanonicalSignature(const valtype &vchSig, unsigned int flags) {
return true; return true;
} }
bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, const CTransaction& txTo, unsigned int nIn, unsigned int flags) bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, unsigned int flags, const SignatureChecker& checker)
{ {
CScript::const_iterator pc = script.begin(); CScript::const_iterator pc = script.begin();
CScript::const_iterator pend = script.end(); CScript::const_iterator pend = script.end();
@ -675,7 +675,7 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
scriptCode.FindAndDelete(CScript(vchSig)); scriptCode.FindAndDelete(CScript(vchSig));
bool fSuccess = IsCanonicalSignature(vchSig, flags) && IsCanonicalPubKey(vchPubKey, flags) && bool fSuccess = IsCanonicalSignature(vchSig, flags) && IsCanonicalPubKey(vchPubKey, flags) &&
CheckSig(vchSig, vchPubKey, scriptCode, txTo, nIn, flags); checker.CheckSig(vchSig, vchPubKey, scriptCode, flags);
popstack(stack); popstack(stack);
popstack(stack); popstack(stack);
@ -736,7 +736,7 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
// Check signature // Check signature
bool fOk = IsCanonicalSignature(vchSig, flags) && IsCanonicalPubKey(vchPubKey, flags) && bool fOk = IsCanonicalSignature(vchSig, flags) && IsCanonicalPubKey(vchPubKey, flags) &&
CheckSig(vchSig, vchPubKey, scriptCode, txTo, nIn, flags); checker.CheckSig(vchSig, vchPubKey, scriptCode, flags);
if (fOk) { if (fOk) {
isig++; isig++;
@ -976,7 +976,7 @@ public:
} }
}; };
bool CheckSig(vector<unsigned char> vchSig, const vector<unsigned char>& vchPubKey, const CScript& scriptCode, const CTransaction& txTo, unsigned int nIn, int flags) bool SignatureChecker::CheckSig(const vector<unsigned char>& vchSigIn, const vector<unsigned char>& vchPubKey, const CScript& scriptCode, int flags) const
{ {
static CSignatureCache signatureCache; static CSignatureCache signatureCache;
@ -985,6 +985,7 @@ bool CheckSig(vector<unsigned char> vchSig, const vector<unsigned char>& vchPubK
return false; return false;
// Hash type is one byte tacked on to the end of the signature // Hash type is one byte tacked on to the end of the signature
vector<unsigned char> vchSig(vchSigIn);
if (vchSig.empty()) if (vchSig.empty())
return false; return false;
int nHashType = vchSig.back(); int nHashType = vchSig.back();
@ -1004,14 +1005,14 @@ bool CheckSig(vector<unsigned char> vchSig, const vector<unsigned char>& vchPubK
return true; return true;
} }
bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CTransaction& txTo, unsigned int nIn, unsigned int flags) bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, unsigned int flags, const SignatureChecker& checker)
{ {
vector<vector<unsigned char> > stack, stackCopy; vector<vector<unsigned char> > stack, stackCopy;
if (!EvalScript(stack, scriptSig, txTo, nIn, flags)) if (!EvalScript(stack, scriptSig, flags, checker))
return false; return false;
if (flags & SCRIPT_VERIFY_P2SH) if (flags & SCRIPT_VERIFY_P2SH)
stackCopy = stack; stackCopy = stack;
if (!EvalScript(stack, scriptPubKey, txTo, nIn, flags)) if (!EvalScript(stack, scriptPubKey, flags, checker))
return false; return false;
if (stack.empty()) if (stack.empty())
return false; return false;
@ -1034,7 +1035,7 @@ bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const C
CScript pubKey2(pubKeySerialized.begin(), pubKeySerialized.end()); CScript pubKey2(pubKeySerialized.begin(), pubKeySerialized.end());
popstack(stackCopy); popstack(stackCopy);
if (!EvalScript(stackCopy, pubKey2, txTo, nIn, flags)) if (!EvalScript(stackCopy, pubKey2, flags, checker))
return false; return false;
if (stackCopy.empty()) if (stackCopy.empty())
return false; return false;

28
src/script/interpreter.h
View file

@ -38,8 +38,30 @@ bool IsCanonicalPubKey(const std::vector<unsigned char> &vchPubKey, unsigned int
bool IsCanonicalSignature(const std::vector<unsigned char> &vchSig, unsigned int flags); bool IsCanonicalSignature(const std::vector<unsigned char> &vchSig, unsigned int flags);
uint256 SignatureHash(const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType); uint256 SignatureHash(const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType);
bool CheckSig(std::vector<unsigned char> vchSig, const std::vector<unsigned char> &vchPubKey, const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int flags);
bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, const CTransaction& txTo, unsigned int nIn, unsigned int flags); class SignatureChecker
bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CTransaction& txTo, unsigned int nIn, unsigned int flags); {
private:
const CTransaction& txTo;
unsigned int nIn;
public:
SignatureChecker(const CTransaction& txToIn, unsigned int nInIn) : txTo(txToIn), nIn(nInIn) {}
bool CheckSig(const std::vector<unsigned char>& scriptSig, const std::vector<unsigned char>& vchPubKey, const CScript& scriptCode, int nFlags) const;
};
bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, unsigned int flags, const SignatureChecker& checker);
bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, unsigned int flags, const SignatureChecker& checker);
// Wrappers using a default SignatureChecker.
bool inline EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, const CTransaction& txTo, unsigned int nIn, unsigned int flags)
{
return EvalScript(stack, script, flags, SignatureChecker(txTo, nIn));
}
bool inline VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CTransaction& txTo, unsigned int nIn, unsigned int flags)
{
return VerifyScript(scriptSig, scriptPubKey, flags, SignatureChecker(txTo, nIn));
}
#endif // H_BITCOIN_SCRIPT_INTERPRETER #endif // H_BITCOIN_SCRIPT_INTERPRETER

2
src/script/sign.cpp
View file

@ -174,7 +174,7 @@ static CScript CombineMultisig(CScript scriptPubKey, const CMutableTransaction&
if (sigs.count(pubkey)) if (sigs.count(pubkey))
continue; // Already got a sig for this pubkey continue; // Already got a sig for this pubkey
if (CheckSig(sig, pubkey, scriptPubKey, txTo, nIn, 0)) if (SignatureChecker(txTo, nIn).CheckSig(sig, pubkey, scriptPubKey, 0))
{ {
sigs[pubkey] = sig; sigs[pubkey] = sig;
break; break;

2
src/test/script_tests.cpp
View file

@ -89,7 +89,7 @@ CMutableTransaction BuildSpendingTransaction(const CScript& scriptSig, const CTr
void DoTest(const CScript& scriptPubKey, const CScript& scriptSig, int flags, bool expect, const std::string& message) void DoTest(const CScript& scriptPubKey, const CScript& scriptSig, int flags, bool expect, const std::string& message)
{ {
BOOST_CHECK_MESSAGE(VerifyScript(scriptSig, scriptPubKey, BuildSpendingTransaction(scriptSig, BuildCreditingTransaction(scriptPubKey)), 0, flags) == expect, message); BOOST_CHECK_MESSAGE(VerifyScript(scriptSig, scriptPubKey, flags, SignatureChecker(BuildSpendingTransaction(scriptSig, BuildCreditingTransaction(scriptPubKey)), 0)) == expect, message);
} }
namespace namespace