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Don't pass nHashType to EvalScript nor CheckSig
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@jtimon @sipa
jtimon authored and sipa committed Sep 12, 2014
1 parent 2b23a87 commit 6dcfda2
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Showing 5 changed files with 18 additions and 21 deletions.
2 changes: 1 addition & 1 deletion src/main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -697,7 +697,7 @@ bool AreInputsStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs)
// IsStandard() will have already returned false
// and this method isn't called.
vector<vector<unsigned char> > stack;
if (!EvalScript(stack, tx.vin[i].scriptSig, tx, i, false, 0))
if (!EvalScript(stack, tx.vin[i].scriptSig, tx, i, false))
return false;

if (whichType == TX_SCRIPTHASH)
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19 changes: 8 additions & 11 deletions src/script/interpreter.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -132,7 +132,7 @@ bool IsCanonicalSignature(const valtype &vchSig, unsigned int flags) {
return true;
}

bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, const CTransaction& txTo, unsigned int nIn, unsigned int flags, int nHashType)
bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, const CTransaction& txTo, unsigned int nIn, unsigned int flags)
{
CScript::const_iterator pc = script.begin();
CScript::const_iterator pend = script.end();
Expand Down Expand Up @@ -675,7 +675,7 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
scriptCode.FindAndDelete(CScript(vchSig));

bool fSuccess = IsCanonicalSignature(vchSig, flags) && IsCanonicalPubKey(vchPubKey, flags) &&
CheckSig(vchSig, vchPubKey, scriptCode, txTo, nIn, nHashType, flags);
CheckSig(vchSig, vchPubKey, scriptCode, txTo, nIn, flags);

popstack(stack);
popstack(stack);
Expand Down Expand Up @@ -736,7 +736,7 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co

// Check signature
bool fOk = IsCanonicalSignature(vchSig, flags) && IsCanonicalPubKey(vchPubKey, flags) &&
CheckSig(vchSig, vchPubKey, scriptCode, txTo, nIn, nHashType, flags);
CheckSig(vchSig, vchPubKey, scriptCode, txTo, nIn, flags);

if (fOk) {
isig++;
Expand Down Expand Up @@ -975,7 +975,7 @@ class CSignatureCache
}
};

bool CheckSig(vector<unsigned char> vchSig, const vector<unsigned char> &vchPubKey, const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType, int flags)
bool CheckSig(vector<unsigned char> vchSig, const vector<unsigned char>& vchPubKey, const CScript& scriptCode, const CTransaction& txTo, unsigned int nIn, int flags)
{
static CSignatureCache signatureCache;

Expand All @@ -986,10 +986,7 @@ bool CheckSig(vector<unsigned char> vchSig, const vector<unsigned char> &vchPubK
// Hash type is one byte tacked on to the end of the signature
if (vchSig.empty())
return false;
if (nHashType == 0)
nHashType = vchSig.back();
else if (nHashType != vchSig.back())
return false;
int nHashType = vchSig.back();
vchSig.pop_back();

uint256 sighash = SignatureHash(scriptCode, txTo, nIn, nHashType);
Expand All @@ -1009,11 +1006,11 @@ bool CheckSig(vector<unsigned char> vchSig, const vector<unsigned char> &vchPubK
bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CTransaction& txTo, unsigned int nIn, unsigned int flags)
{
vector<vector<unsigned char> > stack, stackCopy;
if (!EvalScript(stack, scriptSig, txTo, nIn, flags, 0))
if (!EvalScript(stack, scriptSig, txTo, nIn, flags))
return false;
if (flags & SCRIPT_VERIFY_P2SH)
stackCopy = stack;
if (!EvalScript(stack, scriptPubKey, txTo, nIn, flags, 0))
if (!EvalScript(stack, scriptPubKey, txTo, nIn, flags))
return false;
if (stack.empty())
return false;
Expand All @@ -1036,7 +1033,7 @@ bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const C
CScript pubKey2(pubKeySerialized.begin(), pubKeySerialized.end());
popstack(stackCopy);

if (!EvalScript(stackCopy, pubKey2, txTo, nIn, flags, 0))
if (!EvalScript(stackCopy, pubKey2, txTo, nIn, flags))
return false;
if (stackCopy.empty())
return false;
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4 changes: 2 additions & 2 deletions src/script/interpreter.h
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Original file line number Diff line number Diff line change
Expand Up @@ -38,8 +38,8 @@ bool IsCanonicalPubKey(const std::vector<unsigned char> &vchPubKey, unsigned int
bool IsCanonicalSignature(const std::vector<unsigned char> &vchSig, unsigned int flags);

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 nHashType, int flags);
bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, const CTransaction& txTo, unsigned int nIn, unsigned int flags, 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);
bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CTransaction& txTo, unsigned int nIn, unsigned int flags);

#endif
6 changes: 3 additions & 3 deletions src/script/sign.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -174,7 +174,7 @@ static CScript CombineMultisig(CScript scriptPubKey, const CMutableTransaction&
if (sigs.count(pubkey))
continue; // Already got a sig for this pubkey

if (CheckSig(sig, pubkey, scriptPubKey, txTo, nIn, 0, 0))
if (CheckSig(sig, pubkey, scriptPubKey, txTo, nIn, 0))
{
sigs[pubkey] = sig;
break;
Expand Down Expand Up @@ -252,9 +252,9 @@ CScript CombineSignatures(CScript scriptPubKey, const CTransaction& txTo, unsign
Solver(scriptPubKey, txType, vSolutions);

vector<valtype> stack1;
EvalScript(stack1, scriptSig1, CTransaction(), 0, SCRIPT_VERIFY_STRICTENC, 0);
EvalScript(stack1, scriptSig1, CTransaction(), 0, SCRIPT_VERIFY_STRICTENC);
vector<valtype> stack2;
EvalScript(stack2, scriptSig2, CTransaction(), 0, SCRIPT_VERIFY_STRICTENC, 0);
EvalScript(stack2, scriptSig2, CTransaction(), 0, SCRIPT_VERIFY_STRICTENC);

return CombineSignatures(scriptPubKey, txTo, nIn, txType, vSolutions, stack1, stack2);
}
8 changes: 4 additions & 4 deletions src/test/script_tests.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -116,18 +116,18 @@ BOOST_AUTO_TEST_CASE(script_PushData)
static const unsigned char pushdata4[] = { OP_PUSHDATA4, 1, 0, 0, 0, 0x5a };

vector<vector<unsigned char> > directStack;
BOOST_CHECK(EvalScript(directStack, CScript(&direct[0], &direct[sizeof(direct)]), CTransaction(), 0, true, 0));
BOOST_CHECK(EvalScript(directStack, CScript(&direct[0], &direct[sizeof(direct)]), CTransaction(), 0, true));

vector<vector<unsigned char> > pushdata1Stack;
BOOST_CHECK(EvalScript(pushdata1Stack, CScript(&pushdata1[0], &pushdata1[sizeof(pushdata1)]), CTransaction(), 0, true, 0));
BOOST_CHECK(EvalScript(pushdata1Stack, CScript(&pushdata1[0], &pushdata1[sizeof(pushdata1)]), CTransaction(), 0, true));
BOOST_CHECK(pushdata1Stack == directStack);

vector<vector<unsigned char> > pushdata2Stack;
BOOST_CHECK(EvalScript(pushdata2Stack, CScript(&pushdata2[0], &pushdata2[sizeof(pushdata2)]), CTransaction(), 0, true, 0));
BOOST_CHECK(EvalScript(pushdata2Stack, CScript(&pushdata2[0], &pushdata2[sizeof(pushdata2)]), CTransaction(), 0, true));
BOOST_CHECK(pushdata2Stack == directStack);

vector<vector<unsigned char> > pushdata4Stack;
BOOST_CHECK(EvalScript(pushdata4Stack, CScript(&pushdata4[0], &pushdata4[sizeof(pushdata4)]), CTransaction(), 0, true, 0));
BOOST_CHECK(EvalScript(pushdata4Stack, CScript(&pushdata4[0], &pushdata4[sizeof(pushdata4)]), CTransaction(), 0, true));
BOOST_CHECK(pushdata4Stack == directStack);
}

Expand Down

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