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fixed segfault in bignum.h,

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additional security limits,
refactoring
-- version 0.3.7

git-svn-id: https://bitcoin.svn.sourceforge.net/svnroot/bitcoin/trunk@121 1a98c847-1fd6-4fd8-948a-caf3550aa51b
This commit is contained in:
s_nakamoto
2010-07-31 19:15:48 +00:00
parent 01bed1828b
commit 6ff5f718b6
6 changed files with 39 additions and 24 deletions
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32
script.cpp
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@@ -42,20 +42,17 @@ void MakeSameSize(valtype& vch1, valtype& vch2)
#define stacktop(i) (stack.at(stack.size()+(i)))
#define altstacktop(i) (altstack.at(altstack.size()+(i)))
bool EvalScript(const CScript& script, const CTransaction& txTo, unsigned int nIn, int nHashType,
vector<vector<unsigned char> >* pvStackRet)
bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, const CTransaction& txTo, unsigned int nIn, int nHashType)
{
CAutoBN_CTX pctx;
CScript::const_iterator pc = script.begin();
CScript::const_iterator pend = script.end();
CScript::const_iterator pbegincodehash = script.begin();
vector<bool> vfExec;
vector<valtype> stack;
vector<valtype> altstack;
if (pvStackRet)
pvStackRet->clear();
if (script.size() > 20000)
if (script.size() > 10000)
return false;
int nOpCount = 0;
try
@@ -73,6 +70,8 @@ bool EvalScript(const CScript& script, const CTransaction& txTo, unsigned int nI
return false;
if (vchPushValue.size() > 5000)
return false;
if (opcode > OP_16 && nOpCount++ > 200)
return false;
if (fExec && opcode <= OP_PUSHDATA4)
stack.push_back(vchPushValue);
@@ -828,9 +827,7 @@ bool EvalScript(const CScript& script, const CTransaction& txTo, unsigned int nI
if (!vfExec.empty())
return false;
if (pvStackRet)
*pvStackRet = stack;
return (stack.empty() ? false : CastToBool(stack.back()));
return true;
}
#undef top
@@ -1114,6 +1111,19 @@ bool ExtractHash160(const CScript& scriptPubKey, uint160& hash160Ret)
}
bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CTransaction& txTo, unsigned int nIn, int nHashType)
{
vector<vector<unsigned char> > stack;
if (!EvalScript(stack, scriptSig, txTo, nIn, nHashType))
return false;
if (!EvalScript(stack, scriptPubKey, txTo, nIn, nHashType))
return false;
if (stack.empty())
return false;
return CastToBool(stack.back());
}
bool SignSignature(const CTransaction& txFrom, CTransaction& txTo, unsigned int nIn, int nHashType, CScript scriptPrereq)
{
assert(nIn < txTo.vin.size());
@@ -1132,7 +1142,7 @@ bool SignSignature(const CTransaction& txFrom, CTransaction& txTo, unsigned int
// Test solution
if (scriptPrereq.empty())
if (!EvalScript(txin.scriptSig + CScript(OP_CODESEPARATOR) + txout.scriptPubKey, txTo, nIn))
if (!VerifyScript(txin.scriptSig, txout.scriptPubKey, txTo, nIn, 0))
return false;
return true;
@@ -1150,7 +1160,7 @@ bool VerifySignature(const CTransaction& txFrom, const CTransaction& txTo, unsig
if (txin.prevout.hash != txFrom.GetHash())
return false;
if (!EvalScript(txin.scriptSig + CScript(OP_CODESEPARATOR) + txout.scriptPubKey, txTo, nIn, nHashType))
if (!VerifyScript(txin.scriptSig, txout.scriptPubKey, txTo, nIn, nHashType))
return false;
// Anytime a signature is successfully verified, it's proof the outpoint is spent,