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script: switch to CScriptNum usage for scripts

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This commit is contained in:
Cory Fields
2014-03-26 15:55:35 -04:00
parent 48d8eb1847
commit 27bff74e39
2 changed files with 28 additions and 67 deletions
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44
src/script.cpp
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@@ -25,22 +25,13 @@ typedef vector<unsigned char> valtype;
static const valtype vchFalse(0);
static const valtype vchZero(0);
static const valtype vchTrue(1, 1);
static const CBigNum bnZero(0);
static const CBigNum bnOne(1);
static const CBigNum bnFalse(0);
static const CBigNum bnTrue(1);
static const size_t nMaxNumSize = 4;
static const CScriptNum bnZero(0);
static const CScriptNum bnOne(1);
static const CScriptNum bnFalse(0);
static const CScriptNum bnTrue(1);
bool CheckSig(vector<unsigned char> vchSig, const vector<unsigned char> &vchPubKey, const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType, int flags);
CBigNum CastToBigNum(const valtype& vch)
{
if (vch.size() > nMaxNumSize)
throw runtime_error("CastToBigNum() : overflow");
// Get rid of extra leading zeros
return CBigNum(CBigNum(vch).getvch());
}
bool CastToBool(const valtype& vch)
{
for (unsigned int i = 0; i < vch.size(); i++)
@@ -306,7 +297,6 @@ bool IsCanonicalSignature(const valtype &vchSig, unsigned int flags) {
bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, const CTransaction& txTo, unsigned int nIn, unsigned int flags, int nHashType)
{
CAutoBN_CTX pctx;
CScript::const_iterator pc = script.begin();
CScript::const_iterator pend = script.end();
CScript::const_iterator pbegincodehash = script.begin();
@@ -380,7 +370,7 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
case OP_16:
{
// ( -- value)
CBigNum bn((int)opcode - (int)(OP_1 - 1));
CScriptNum bn((int)opcode - (int)(OP_1 - 1));
stack.push_back(bn.getvch());
}
break;
@@ -556,7 +546,7 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
case OP_DEPTH:
{
// -- stacksize
CBigNum bn(stack.size());
CScriptNum bn(stack.size());
stack.push_back(bn.getvch());
}
break;
@@ -606,7 +596,7 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
// (xn ... x2 x1 x0 n - ... x2 x1 x0 xn)
if (stack.size() < 2)
return false;
int n = CastToBigNum(stacktop(-1)).getint();
int n = CScriptNum(stacktop(-1)).getint();
popstack(stack);
if (n < 0 || n >= (int)stack.size())
return false;
@@ -654,7 +644,7 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
// (in -- in size)
if (stack.size() < 1)
return false;
CBigNum bn(stacktop(-1).size());
CScriptNum bn(stacktop(-1).size());
stack.push_back(bn.getvch());
}
break;
@@ -705,7 +695,7 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
// (in -- out)
if (stack.size() < 1)
return false;
CBigNum bn = CastToBigNum(stacktop(-1));
CScriptNum bn(stacktop(-1));
switch (opcode)
{
case OP_1ADD: bn += bnOne; break;
@@ -738,9 +728,9 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
// (x1 x2 -- out)
if (stack.size() < 2)
return false;
CBigNum bn1 = CastToBigNum(stacktop(-2));
CBigNum bn2 = CastToBigNum(stacktop(-1));
CBigNum bn;
CScriptNum bn1(stacktop(-2));
CScriptNum bn2(stacktop(-1));
CScriptNum bn(0);
switch (opcode)
{
case OP_ADD:
@@ -783,9 +773,9 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
// (x min max -- out)
if (stack.size() < 3)
return false;
CBigNum bn1 = CastToBigNum(stacktop(-3));
CBigNum bn2 = CastToBigNum(stacktop(-2));
CBigNum bn3 = CastToBigNum(stacktop(-1));
CScriptNum bn1(stacktop(-3));
CScriptNum bn2(stacktop(-2));
CScriptNum bn3(stacktop(-1));
bool fValue = (bn2 <= bn1 && bn1 < bn3);
popstack(stack);
popstack(stack);
@@ -882,7 +872,7 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
if ((int)stack.size() < i)
return false;
int nKeysCount = CastToBigNum(stacktop(-i)).getint();
int nKeysCount = CScriptNum(stacktop(-i)).getint();
if (nKeysCount < 0 || nKeysCount > 20)
return false;
nOpCount += nKeysCount;
@@ -893,7 +883,7 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, co
if ((int)stack.size() < i)
return false;
int nSigsCount = CastToBigNum(stacktop(-i)).getint();
int nSigsCount = CScriptNum(stacktop(-i)).getint();
if (nSigsCount < 0 || nSigsCount > nKeysCount)
return false;
int isig = ++i;