1173 lines
38 KiB
C++
1173 lines
38 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Distributed under the MIT/X11 software license, see the accompanying
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// file license.txt or http://www.opensource.org/licenses/mit-license.php.
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#include "headers.h"
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bool CheckSig(vector<unsigned char> vchSig, vector<unsigned char> vchPubKey, CScript scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType);
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typedef vector<unsigned char> valtype;
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static const valtype vchFalse(0);
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static const valtype vchZero(0);
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static const valtype vchTrue(1, 1);
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static const CBigNum bnZero(0);
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static const CBigNum bnOne(1);
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static const CBigNum bnFalse(0);
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static const CBigNum bnTrue(1);
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static const size_t nMaxNumSize = 258;
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bool CastToBool(const valtype& vch)
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{
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return (CBigNum(vch) != bnZero);
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}
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void MakeSameSize(valtype& vch1, valtype& vch2)
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{
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// Lengthen the shorter one
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if (vch1.size() < vch2.size())
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vch1.resize(vch2.size(), 0);
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if (vch2.size() < vch1.size())
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vch2.resize(vch1.size(), 0);
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}
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//
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// Script is a stack machine (like Forth) that evaluates a predicate
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// returning a bool indicating valid or not. There are no loops.
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//
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#define stacktop(i) (stack.at(stack.size()+(i)))
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#define altstacktop(i) (altstack.at(altstack.size()+(i)))
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bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, const CTransaction& txTo, unsigned int nIn, int nHashType)
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{
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CAutoBN_CTX pctx;
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CScript::const_iterator pc = script.begin();
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CScript::const_iterator pend = script.end();
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CScript::const_iterator pbegincodehash = script.begin();
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vector<bool> vfExec;
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vector<valtype> altstack;
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if (script.size() > 10000)
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return false;
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int nOpCount = 0;
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try
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{
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while (pc < pend)
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{
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bool fExec = !count(vfExec.begin(), vfExec.end(), false);
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//
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// Read instruction
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//
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opcodetype opcode;
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valtype vchPushValue;
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if (!script.GetOp(pc, opcode, vchPushValue))
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return false;
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if (vchPushValue.size() > 5000)
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return false;
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if (opcode > OP_16 && nOpCount++ > 200)
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return false;
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if (fExec && opcode <= OP_PUSHDATA4)
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stack.push_back(vchPushValue);
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else if (fExec || (OP_IF <= opcode && opcode <= OP_ENDIF))
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switch (opcode)
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{
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//
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// Push value
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//
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case OP_1NEGATE:
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case OP_1:
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case OP_2:
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case OP_3:
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case OP_4:
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case OP_5:
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case OP_6:
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case OP_7:
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case OP_8:
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case OP_9:
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case OP_10:
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case OP_11:
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case OP_12:
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case OP_13:
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case OP_14:
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case OP_15:
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case OP_16:
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{
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// ( -- value)
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CBigNum bn((int)opcode - (int)(OP_1 - 1));
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stack.push_back(bn.getvch());
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}
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break;
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//
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// Control
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//
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case OP_NOP:
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case OP_NOP1: case OP_NOP2: case OP_NOP3: case OP_NOP4: case OP_NOP5:
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case OP_NOP6: case OP_NOP7: case OP_NOP8: case OP_NOP9: case OP_NOP10:
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break;
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case OP_VER:
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case OP_VERIF:
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case OP_VERNOTIF:
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{
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return false;
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}
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break;
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case OP_IF:
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case OP_NOTIF:
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{
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// <expression> if [statements] [else [statements]] endif
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bool fValue = false;
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if (fExec)
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{
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if (stack.size() < 1)
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return false;
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valtype& vch = stacktop(-1);
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fValue = CastToBool(vch);
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if (opcode == OP_NOTIF)
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fValue = !fValue;
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stack.pop_back();
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}
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vfExec.push_back(fValue);
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}
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break;
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case OP_ELSE:
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{
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if (vfExec.empty())
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return false;
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vfExec.back() = !vfExec.back();
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}
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break;
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case OP_ENDIF:
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{
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if (vfExec.empty())
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return false;
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vfExec.pop_back();
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}
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break;
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case OP_VERIFY:
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{
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// (true -- ) or
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// (false -- false) and return
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if (stack.size() < 1)
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return false;
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bool fValue = CastToBool(stacktop(-1));
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if (fValue)
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stack.pop_back();
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else
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return false;
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}
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break;
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case OP_RETURN:
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{
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return false;
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}
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break;
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//
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// Stack ops
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//
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case OP_TOALTSTACK:
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{
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if (stack.size() < 1)
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return false;
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altstack.push_back(stacktop(-1));
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stack.pop_back();
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}
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break;
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case OP_FROMALTSTACK:
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{
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if (altstack.size() < 1)
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return false;
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stack.push_back(altstacktop(-1));
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altstack.pop_back();
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}
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break;
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case OP_2DROP:
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{
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// (x1 x2 -- )
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stack.pop_back();
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stack.pop_back();
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}
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break;
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case OP_2DUP:
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{
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// (x1 x2 -- x1 x2 x1 x2)
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if (stack.size() < 2)
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return false;
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valtype vch1 = stacktop(-2);
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valtype vch2 = stacktop(-1);
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stack.push_back(vch1);
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stack.push_back(vch2);
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}
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break;
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case OP_3DUP:
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{
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// (x1 x2 x3 -- x1 x2 x3 x1 x2 x3)
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if (stack.size() < 3)
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return false;
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valtype vch1 = stacktop(-3);
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valtype vch2 = stacktop(-2);
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valtype vch3 = stacktop(-1);
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stack.push_back(vch1);
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stack.push_back(vch2);
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stack.push_back(vch3);
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}
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break;
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case OP_2OVER:
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{
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// (x1 x2 x3 x4 -- x1 x2 x3 x4 x1 x2)
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if (stack.size() < 4)
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return false;
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valtype vch1 = stacktop(-4);
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valtype vch2 = stacktop(-3);
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stack.push_back(vch1);
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stack.push_back(vch2);
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}
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break;
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case OP_2ROT:
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{
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// (x1 x2 x3 x4 x5 x6 -- x3 x4 x5 x6 x1 x2)
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if (stack.size() < 6)
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return false;
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valtype vch1 = stacktop(-6);
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valtype vch2 = stacktop(-5);
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stack.erase(stack.end()-6, stack.end()-4);
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stack.push_back(vch1);
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stack.push_back(vch2);
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}
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break;
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case OP_2SWAP:
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{
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// (x1 x2 x3 x4 -- x3 x4 x1 x2)
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if (stack.size() < 4)
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return false;
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swap(stacktop(-4), stacktop(-2));
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swap(stacktop(-3), stacktop(-1));
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}
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break;
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case OP_IFDUP:
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{
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// (x - 0 | x x)
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if (stack.size() < 1)
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return false;
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valtype vch = stacktop(-1);
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if (CastToBool(vch))
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stack.push_back(vch);
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}
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break;
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case OP_DEPTH:
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{
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// -- stacksize
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CBigNum bn(stack.size());
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stack.push_back(bn.getvch());
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}
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break;
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case OP_DROP:
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{
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// (x -- )
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if (stack.size() < 1)
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return false;
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stack.pop_back();
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}
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break;
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case OP_DUP:
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{
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// (x -- x x)
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if (stack.size() < 1)
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return false;
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valtype vch = stacktop(-1);
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stack.push_back(vch);
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}
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break;
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case OP_NIP:
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{
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// (x1 x2 -- x2)
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if (stack.size() < 2)
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return false;
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stack.erase(stack.end() - 2);
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}
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break;
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case OP_OVER:
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{
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// (x1 x2 -- x1 x2 x1)
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if (stack.size() < 2)
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return false;
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valtype vch = stacktop(-2);
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stack.push_back(vch);
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}
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break;
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case OP_PICK:
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case OP_ROLL:
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{
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// (xn ... x2 x1 x0 n - xn ... x2 x1 x0 xn)
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// (xn ... x2 x1 x0 n - ... x2 x1 x0 xn)
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if (stack.size() < 2)
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return false;
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int n = CBigNum(stacktop(-1)).getint();
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stack.pop_back();
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if (n < 0 || n >= stack.size())
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return false;
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valtype vch = stacktop(-n-1);
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if (opcode == OP_ROLL)
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stack.erase(stack.end()-n-1);
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stack.push_back(vch);
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}
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break;
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case OP_ROT:
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{
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// (x1 x2 x3 -- x2 x3 x1)
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// x2 x1 x3 after first swap
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// x2 x3 x1 after second swap
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if (stack.size() < 3)
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return false;
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swap(stacktop(-3), stacktop(-2));
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swap(stacktop(-2), stacktop(-1));
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}
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break;
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case OP_SWAP:
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{
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// (x1 x2 -- x2 x1)
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if (stack.size() < 2)
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return false;
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swap(stacktop(-2), stacktop(-1));
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}
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break;
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case OP_TUCK:
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{
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// (x1 x2 -- x2 x1 x2)
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if (stack.size() < 2)
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return false;
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valtype vch = stacktop(-1);
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stack.insert(stack.end()-2, vch);
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}
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break;
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//
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// Splice ops
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//
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case OP_CAT:
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{
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// (x1 x2 -- out)
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if (stack.size() < 2)
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return false;
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valtype& vch1 = stacktop(-2);
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valtype& vch2 = stacktop(-1);
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vch1.insert(vch1.end(), vch2.begin(), vch2.end());
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stack.pop_back();
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if (stacktop(-1).size() > 5000)
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return false;
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}
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break;
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case OP_SUBSTR:
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{
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// (in begin size -- out)
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if (stack.size() < 3)
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return false;
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valtype& vch = stacktop(-3);
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int nBegin = CBigNum(stacktop(-2)).getint();
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int nEnd = nBegin + CBigNum(stacktop(-1)).getint();
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if (nBegin < 0 || nEnd < nBegin)
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return false;
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if (nBegin > vch.size())
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nBegin = vch.size();
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if (nEnd > vch.size())
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nEnd = vch.size();
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vch.erase(vch.begin() + nEnd, vch.end());
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vch.erase(vch.begin(), vch.begin() + nBegin);
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stack.pop_back();
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stack.pop_back();
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}
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break;
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case OP_LEFT:
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case OP_RIGHT:
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{
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// (in size -- out)
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if (stack.size() < 2)
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return false;
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valtype& vch = stacktop(-2);
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int nSize = CBigNum(stacktop(-1)).getint();
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if (nSize < 0)
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return false;
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if (nSize > vch.size())
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nSize = vch.size();
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if (opcode == OP_LEFT)
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vch.erase(vch.begin() + nSize, vch.end());
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else
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vch.erase(vch.begin(), vch.end() - nSize);
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stack.pop_back();
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}
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break;
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case OP_SIZE:
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{
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// (in -- in size)
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if (stack.size() < 1)
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return false;
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CBigNum bn(stacktop(-1).size());
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stack.push_back(bn.getvch());
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}
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break;
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//
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// Bitwise logic
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//
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case OP_INVERT:
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{
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// (in - out)
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if (stack.size() < 1)
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return false;
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valtype& vch = stacktop(-1);
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for (int i = 0; i < vch.size(); i++)
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vch[i] = ~vch[i];
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}
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break;
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case OP_AND:
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case OP_OR:
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case OP_XOR:
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{
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// (x1 x2 - out)
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if (stack.size() < 2)
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return false;
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valtype& vch1 = stacktop(-2);
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valtype& vch2 = stacktop(-1);
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MakeSameSize(vch1, vch2);
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if (opcode == OP_AND)
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{
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for (int i = 0; i < vch1.size(); i++)
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vch1[i] &= vch2[i];
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}
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else if (opcode == OP_OR)
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{
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for (int i = 0; i < vch1.size(); i++)
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vch1[i] |= vch2[i];
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}
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else if (opcode == OP_XOR)
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{
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for (int i = 0; i < vch1.size(); i++)
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vch1[i] ^= vch2[i];
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}
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stack.pop_back();
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}
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break;
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case OP_EQUAL:
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case OP_EQUALVERIFY:
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//case OP_NOTEQUAL: // use OP_NUMNOTEQUAL
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{
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// (x1 x2 - bool)
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if (stack.size() < 2)
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return false;
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valtype& vch1 = stacktop(-2);
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valtype& vch2 = stacktop(-1);
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bool fEqual = (vch1 == vch2);
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// OP_NOTEQUAL is disabled because it would be too easy to say
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// something like n != 1 and have some wiseguy pass in 1 with extra
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// zero bytes after it (numerically, 0x01 == 0x0001 == 0x000001)
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//if (opcode == OP_NOTEQUAL)
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// fEqual = !fEqual;
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stack.pop_back();
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stack.pop_back();
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stack.push_back(fEqual ? vchTrue : vchFalse);
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if (opcode == OP_EQUALVERIFY)
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{
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if (fEqual)
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stack.pop_back();
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else
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return false;
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}
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}
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break;
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//
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// Numeric
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//
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case OP_1ADD:
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case OP_1SUB:
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case OP_2MUL:
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case OP_2DIV:
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case OP_NEGATE:
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case OP_ABS:
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case OP_NOT:
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case OP_0NOTEQUAL:
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{
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// (in -- out)
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if (stack.size() < 1)
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return false;
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if (stacktop(-1).size() > nMaxNumSize)
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return false;
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CBigNum bn(stacktop(-1));
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switch (opcode)
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{
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case OP_1ADD: bn += bnOne; break;
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case OP_1SUB: bn -= bnOne; break;
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case OP_2MUL: bn <<= 1; break;
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case OP_2DIV: bn >>= 1; break;
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case OP_NEGATE: bn = -bn; break;
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case OP_ABS: if (bn < bnZero) bn = -bn; break;
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case OP_NOT: bn = (bn == bnZero); break;
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case OP_0NOTEQUAL: bn = (bn != bnZero); break;
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}
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stack.pop_back();
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stack.push_back(bn.getvch());
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}
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break;
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case OP_ADD:
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case OP_SUB:
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case OP_MUL:
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case OP_DIV:
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case OP_MOD:
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case OP_LSHIFT:
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case OP_RSHIFT:
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case OP_BOOLAND:
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case OP_BOOLOR:
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case OP_NUMEQUAL:
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case OP_NUMEQUALVERIFY:
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case OP_NUMNOTEQUAL:
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case OP_LESSTHAN:
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case OP_GREATERTHAN:
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case OP_LESSTHANOREQUAL:
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case OP_GREATERTHANOREQUAL:
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case OP_MIN:
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case OP_MAX:
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|
{
|
|
// (x1 x2 -- out)
|
|
if (stack.size() < 2)
|
|
return false;
|
|
if (stacktop(-2).size() > nMaxNumSize ||
|
|
stacktop(-1).size() > nMaxNumSize)
|
|
return false;
|
|
CBigNum bn1(stacktop(-2));
|
|
CBigNum bn2(stacktop(-1));
|
|
CBigNum bn;
|
|
switch (opcode)
|
|
{
|
|
case OP_ADD:
|
|
bn = bn1 + bn2;
|
|
break;
|
|
|
|
case OP_SUB:
|
|
bn = bn1 - bn2;
|
|
break;
|
|
|
|
case OP_MUL:
|
|
if (!BN_mul(&bn, &bn1, &bn2, pctx))
|
|
return false;
|
|
break;
|
|
|
|
case OP_DIV:
|
|
if (!BN_div(&bn, NULL, &bn1, &bn2, pctx))
|
|
return false;
|
|
break;
|
|
|
|
case OP_MOD:
|
|
if (!BN_mod(&bn, &bn1, &bn2, pctx))
|
|
return false;
|
|
break;
|
|
|
|
case OP_LSHIFT:
|
|
if (bn2 < bnZero || bn2 > CBigNum(2048))
|
|
return false;
|
|
bn = bn1 << bn2.getulong();
|
|
break;
|
|
|
|
case OP_RSHIFT:
|
|
if (bn2 < bnZero || bn2 > CBigNum(2048))
|
|
return false;
|
|
bn = bn1 >> bn2.getulong();
|
|
break;
|
|
|
|
case OP_BOOLAND: bn = (bn1 != bnZero && bn2 != bnZero); break;
|
|
case OP_BOOLOR: bn = (bn1 != bnZero || bn2 != bnZero); break;
|
|
case OP_NUMEQUAL: bn = (bn1 == bn2); break;
|
|
case OP_NUMEQUALVERIFY: bn = (bn1 == bn2); break;
|
|
case OP_NUMNOTEQUAL: bn = (bn1 != bn2); break;
|
|
case OP_LESSTHAN: bn = (bn1 < bn2); break;
|
|
case OP_GREATERTHAN: bn = (bn1 > bn2); break;
|
|
case OP_LESSTHANOREQUAL: bn = (bn1 <= bn2); break;
|
|
case OP_GREATERTHANOREQUAL: bn = (bn1 >= bn2); break;
|
|
case OP_MIN: bn = (bn1 < bn2 ? bn1 : bn2); break;
|
|
case OP_MAX: bn = (bn1 > bn2 ? bn1 : bn2); break;
|
|
}
|
|
stack.pop_back();
|
|
stack.pop_back();
|
|
stack.push_back(bn.getvch());
|
|
|
|
if (opcode == OP_NUMEQUALVERIFY)
|
|
{
|
|
if (CastToBool(stacktop(-1)))
|
|
stack.pop_back();
|
|
else
|
|
return false;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case OP_WITHIN:
|
|
{
|
|
// (x min max -- out)
|
|
if (stack.size() < 3)
|
|
return false;
|
|
if (stacktop(-3).size() > nMaxNumSize ||
|
|
stacktop(-2).size() > nMaxNumSize ||
|
|
stacktop(-1).size() > nMaxNumSize)
|
|
return false;
|
|
CBigNum bn1(stacktop(-3));
|
|
CBigNum bn2(stacktop(-2));
|
|
CBigNum bn3(stacktop(-1));
|
|
bool fValue = (bn2 <= bn1 && bn1 < bn3);
|
|
stack.pop_back();
|
|
stack.pop_back();
|
|
stack.pop_back();
|
|
stack.push_back(fValue ? vchTrue : vchFalse);
|
|
}
|
|
break;
|
|
|
|
|
|
//
|
|
// Crypto
|
|
//
|
|
case OP_RIPEMD160:
|
|
case OP_SHA1:
|
|
case OP_SHA256:
|
|
case OP_HASH160:
|
|
case OP_HASH256:
|
|
{
|
|
// (in -- hash)
|
|
if (stack.size() < 1)
|
|
return false;
|
|
valtype& vch = stacktop(-1);
|
|
valtype vchHash((opcode == OP_RIPEMD160 || opcode == OP_SHA1 || opcode == OP_HASH160) ? 20 : 32);
|
|
if (opcode == OP_RIPEMD160)
|
|
RIPEMD160(&vch[0], vch.size(), &vchHash[0]);
|
|
else if (opcode == OP_SHA1)
|
|
SHA1(&vch[0], vch.size(), &vchHash[0]);
|
|
else if (opcode == OP_SHA256)
|
|
SHA256(&vch[0], vch.size(), &vchHash[0]);
|
|
else if (opcode == OP_HASH160)
|
|
{
|
|
uint160 hash160 = Hash160(vch);
|
|
memcpy(&vchHash[0], &hash160, sizeof(hash160));
|
|
}
|
|
else if (opcode == OP_HASH256)
|
|
{
|
|
uint256 hash = Hash(vch.begin(), vch.end());
|
|
memcpy(&vchHash[0], &hash, sizeof(hash));
|
|
}
|
|
stack.pop_back();
|
|
stack.push_back(vchHash);
|
|
}
|
|
break;
|
|
|
|
case OP_CODESEPARATOR:
|
|
{
|
|
// Hash starts after the code separator
|
|
pbegincodehash = pc;
|
|
}
|
|
break;
|
|
|
|
case OP_CHECKSIG:
|
|
case OP_CHECKSIGVERIFY:
|
|
{
|
|
// (sig pubkey -- bool)
|
|
if (stack.size() < 2)
|
|
return false;
|
|
|
|
valtype& vchSig = stacktop(-2);
|
|
valtype& vchPubKey = stacktop(-1);
|
|
|
|
////// debug print
|
|
//PrintHex(vchSig.begin(), vchSig.end(), "sig: %s\n");
|
|
//PrintHex(vchPubKey.begin(), vchPubKey.end(), "pubkey: %s\n");
|
|
|
|
// Subset of script starting at the most recent codeseparator
|
|
CScript scriptCode(pbegincodehash, pend);
|
|
|
|
// Drop the signature, since there's no way for a signature to sign itself
|
|
scriptCode.FindAndDelete(CScript(vchSig));
|
|
|
|
bool fSuccess = CheckSig(vchSig, vchPubKey, scriptCode, txTo, nIn, nHashType);
|
|
|
|
stack.pop_back();
|
|
stack.pop_back();
|
|
stack.push_back(fSuccess ? vchTrue : vchFalse);
|
|
if (opcode == OP_CHECKSIGVERIFY)
|
|
{
|
|
if (fSuccess)
|
|
stack.pop_back();
|
|
else
|
|
return false;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case OP_CHECKMULTISIG:
|
|
case OP_CHECKMULTISIGVERIFY:
|
|
{
|
|
// ([sig ...] num_of_signatures [pubkey ...] num_of_pubkeys -- bool)
|
|
|
|
int i = 1;
|
|
if (stack.size() < i)
|
|
return false;
|
|
|
|
int nKeysCount = CBigNum(stacktop(-i)).getint();
|
|
if (nKeysCount < 0)
|
|
return false;
|
|
int ikey = ++i;
|
|
i += nKeysCount;
|
|
if (stack.size() < i)
|
|
return false;
|
|
|
|
int nSigsCount = CBigNum(stacktop(-i)).getint();
|
|
if (nSigsCount < 0 || nSigsCount > nKeysCount)
|
|
return false;
|
|
int isig = ++i;
|
|
i += nSigsCount;
|
|
if (stack.size() < i)
|
|
return false;
|
|
|
|
// Subset of script starting at the most recent codeseparator
|
|
CScript scriptCode(pbegincodehash, pend);
|
|
|
|
// Drop the signatures, since there's no way for a signature to sign itself
|
|
for (int k = 0; k < nSigsCount; k++)
|
|
{
|
|
valtype& vchSig = stacktop(-isig-k);
|
|
scriptCode.FindAndDelete(CScript(vchSig));
|
|
}
|
|
|
|
bool fSuccess = true;
|
|
while (fSuccess && nSigsCount > 0)
|
|
{
|
|
valtype& vchSig = stacktop(-isig);
|
|
valtype& vchPubKey = stacktop(-ikey);
|
|
|
|
// Check signature
|
|
if (CheckSig(vchSig, vchPubKey, scriptCode, txTo, nIn, nHashType))
|
|
{
|
|
isig++;
|
|
nSigsCount--;
|
|
}
|
|
ikey++;
|
|
nKeysCount--;
|
|
|
|
// If there are more signatures left than keys left,
|
|
// then too many signatures have failed
|
|
if (nSigsCount > nKeysCount)
|
|
fSuccess = false;
|
|
}
|
|
|
|
while (i-- > 0)
|
|
stack.pop_back();
|
|
stack.push_back(fSuccess ? vchTrue : vchFalse);
|
|
|
|
if (opcode == OP_CHECKMULTISIGVERIFY)
|
|
{
|
|
if (fSuccess)
|
|
stack.pop_back();
|
|
else
|
|
return false;
|
|
}
|
|
}
|
|
break;
|
|
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
// Size limits
|
|
if (stack.size() + altstack.size() > 1000)
|
|
return false;
|
|
}
|
|
}
|
|
catch (...)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
|
|
if (!vfExec.empty())
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
#undef top
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
uint256 SignatureHash(CScript scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType)
|
|
{
|
|
if (nIn >= txTo.vin.size())
|
|
{
|
|
printf("ERROR: SignatureHash() : nIn=%d out of range\n", nIn);
|
|
return 1;
|
|
}
|
|
CTransaction txTmp(txTo);
|
|
|
|
// In case concatenating two scripts ends up with two codeseparators,
|
|
// or an extra one at the end, this prevents all those possible incompatibilities.
|
|
scriptCode.FindAndDelete(CScript(OP_CODESEPARATOR));
|
|
|
|
// Blank out other inputs' signatures
|
|
for (int i = 0; i < txTmp.vin.size(); i++)
|
|
txTmp.vin[i].scriptSig = CScript();
|
|
txTmp.vin[nIn].scriptSig = scriptCode;
|
|
|
|
// Blank out some of the outputs
|
|
if ((nHashType & 0x1f) == SIGHASH_NONE)
|
|
{
|
|
// Wildcard payee
|
|
txTmp.vout.clear();
|
|
|
|
// Let the others update at will
|
|
for (int i = 0; i < txTmp.vin.size(); i++)
|
|
if (i != nIn)
|
|
txTmp.vin[i].nSequence = 0;
|
|
}
|
|
else if ((nHashType & 0x1f) == SIGHASH_SINGLE)
|
|
{
|
|
// Only lockin the txout payee at same index as txin
|
|
unsigned int nOut = nIn;
|
|
if (nOut >= txTmp.vout.size())
|
|
{
|
|
printf("ERROR: SignatureHash() : nOut=%d out of range\n", nOut);
|
|
return 1;
|
|
}
|
|
txTmp.vout.resize(nOut+1);
|
|
for (int i = 0; i < nOut; i++)
|
|
txTmp.vout[i].SetNull();
|
|
|
|
// Let the others update at will
|
|
for (int i = 0; i < txTmp.vin.size(); i++)
|
|
if (i != nIn)
|
|
txTmp.vin[i].nSequence = 0;
|
|
}
|
|
|
|
// Blank out other inputs completely, not recommended for open transactions
|
|
if (nHashType & SIGHASH_ANYONECANPAY)
|
|
{
|
|
txTmp.vin[0] = txTmp.vin[nIn];
|
|
txTmp.vin.resize(1);
|
|
}
|
|
|
|
// Serialize and hash
|
|
CDataStream ss(SER_GETHASH);
|
|
ss.reserve(10000);
|
|
ss << txTmp << nHashType;
|
|
return Hash(ss.begin(), ss.end());
|
|
}
|
|
|
|
|
|
bool CheckSig(vector<unsigned char> vchSig, vector<unsigned char> vchPubKey, CScript scriptCode,
|
|
const CTransaction& txTo, unsigned int nIn, int nHashType)
|
|
{
|
|
CKey key;
|
|
if (!key.SetPubKey(vchPubKey))
|
|
return false;
|
|
|
|
// 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;
|
|
vchSig.pop_back();
|
|
|
|
if (key.Verify(SignatureHash(scriptCode, txTo, nIn, nHashType), vchSig))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
bool Solver(const CScript& scriptPubKey, vector<pair<opcodetype, valtype> >& vSolutionRet)
|
|
{
|
|
// Templates
|
|
static vector<CScript> vTemplates;
|
|
if (vTemplates.empty())
|
|
{
|
|
// Standard tx, sender provides pubkey, receiver adds signature
|
|
vTemplates.push_back(CScript() << OP_PUBKEY << OP_CHECKSIG);
|
|
|
|
// Bitcoin address tx, sender provides hash of pubkey, receiver provides signature and pubkey
|
|
vTemplates.push_back(CScript() << OP_DUP << OP_HASH160 << OP_PUBKEYHASH << OP_EQUALVERIFY << OP_CHECKSIG);
|
|
}
|
|
|
|
// Scan templates
|
|
const CScript& script1 = scriptPubKey;
|
|
foreach(const CScript& script2, vTemplates)
|
|
{
|
|
vSolutionRet.clear();
|
|
opcodetype opcode1, opcode2;
|
|
vector<unsigned char> vch1, vch2;
|
|
|
|
// Compare
|
|
CScript::const_iterator pc1 = script1.begin();
|
|
CScript::const_iterator pc2 = script2.begin();
|
|
loop
|
|
{
|
|
bool f1 = script1.GetOp(pc1, opcode1, vch1);
|
|
bool f2 = script2.GetOp(pc2, opcode2, vch2);
|
|
if (!f1 && !f2)
|
|
{
|
|
// Success
|
|
reverse(vSolutionRet.begin(), vSolutionRet.end());
|
|
return true;
|
|
}
|
|
else if (f1 != f2)
|
|
{
|
|
break;
|
|
}
|
|
else if (opcode2 == OP_PUBKEY)
|
|
{
|
|
if (vch1.size() <= sizeof(uint256))
|
|
break;
|
|
vSolutionRet.push_back(make_pair(opcode2, vch1));
|
|
}
|
|
else if (opcode2 == OP_PUBKEYHASH)
|
|
{
|
|
if (vch1.size() != sizeof(uint160))
|
|
break;
|
|
vSolutionRet.push_back(make_pair(opcode2, vch1));
|
|
}
|
|
else if (opcode1 != opcode2)
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
vSolutionRet.clear();
|
|
return false;
|
|
}
|
|
|
|
|
|
bool Solver(const CScript& scriptPubKey, uint256 hash, int nHashType, CScript& scriptSigRet)
|
|
{
|
|
scriptSigRet.clear();
|
|
|
|
vector<pair<opcodetype, valtype> > vSolution;
|
|
if (!Solver(scriptPubKey, vSolution))
|
|
return false;
|
|
|
|
// Compile solution
|
|
CRITICAL_BLOCK(cs_mapKeys)
|
|
{
|
|
foreach(PAIRTYPE(opcodetype, valtype)& item, vSolution)
|
|
{
|
|
if (item.first == OP_PUBKEY)
|
|
{
|
|
// Sign
|
|
const valtype& vchPubKey = item.second;
|
|
if (!mapKeys.count(vchPubKey))
|
|
return false;
|
|
if (hash != 0)
|
|
{
|
|
vector<unsigned char> vchSig;
|
|
if (!CKey::Sign(mapKeys[vchPubKey], hash, vchSig))
|
|
return false;
|
|
vchSig.push_back((unsigned char)nHashType);
|
|
scriptSigRet << vchSig;
|
|
}
|
|
}
|
|
else if (item.first == OP_PUBKEYHASH)
|
|
{
|
|
// Sign and give pubkey
|
|
map<uint160, valtype>::iterator mi = mapPubKeys.find(uint160(item.second));
|
|
if (mi == mapPubKeys.end())
|
|
return false;
|
|
const vector<unsigned char>& vchPubKey = (*mi).second;
|
|
if (!mapKeys.count(vchPubKey))
|
|
return false;
|
|
if (hash != 0)
|
|
{
|
|
vector<unsigned char> vchSig;
|
|
if (!CKey::Sign(mapKeys[vchPubKey], hash, vchSig))
|
|
return false;
|
|
vchSig.push_back((unsigned char)nHashType);
|
|
scriptSigRet << vchSig << vchPubKey;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
bool IsMine(const CScript& scriptPubKey)
|
|
{
|
|
CScript scriptSig;
|
|
return Solver(scriptPubKey, 0, 0, scriptSig);
|
|
}
|
|
|
|
|
|
bool ExtractPubKey(const CScript& scriptPubKey, bool fMineOnly, vector<unsigned char>& vchPubKeyRet)
|
|
{
|
|
vchPubKeyRet.clear();
|
|
|
|
vector<pair<opcodetype, valtype> > vSolution;
|
|
if (!Solver(scriptPubKey, vSolution))
|
|
return false;
|
|
|
|
CRITICAL_BLOCK(cs_mapKeys)
|
|
{
|
|
foreach(PAIRTYPE(opcodetype, valtype)& item, vSolution)
|
|
{
|
|
valtype vchPubKey;
|
|
if (item.first == OP_PUBKEY)
|
|
{
|
|
vchPubKey = item.second;
|
|
}
|
|
else if (item.first == OP_PUBKEYHASH)
|
|
{
|
|
map<uint160, valtype>::iterator mi = mapPubKeys.find(uint160(item.second));
|
|
if (mi == mapPubKeys.end())
|
|
continue;
|
|
vchPubKey = (*mi).second;
|
|
}
|
|
if (!fMineOnly || mapKeys.count(vchPubKey))
|
|
{
|
|
vchPubKeyRet = vchPubKey;
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
bool ExtractHash160(const CScript& scriptPubKey, uint160& hash160Ret)
|
|
{
|
|
hash160Ret = 0;
|
|
|
|
vector<pair<opcodetype, valtype> > vSolution;
|
|
if (!Solver(scriptPubKey, vSolution))
|
|
return false;
|
|
|
|
foreach(PAIRTYPE(opcodetype, valtype)& item, vSolution)
|
|
{
|
|
if (item.first == OP_PUBKEYHASH)
|
|
{
|
|
hash160Ret = uint160(item.second);
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
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());
|
|
CTxIn& txin = txTo.vin[nIn];
|
|
assert(txin.prevout.n < txFrom.vout.size());
|
|
const CTxOut& txout = txFrom.vout[txin.prevout.n];
|
|
|
|
// Leave out the signature from the hash, since a signature can't sign itself.
|
|
// The checksig op will also drop the signatures from its hash.
|
|
uint256 hash = SignatureHash(scriptPrereq + txout.scriptPubKey, txTo, nIn, nHashType);
|
|
|
|
if (!Solver(txout.scriptPubKey, hash, nHashType, txin.scriptSig))
|
|
return false;
|
|
|
|
txin.scriptSig = scriptPrereq + txin.scriptSig;
|
|
|
|
// Test solution
|
|
if (scriptPrereq.empty())
|
|
if (!VerifyScript(txin.scriptSig, txout.scriptPubKey, txTo, nIn, 0))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
bool VerifySignature(const CTransaction& txFrom, const CTransaction& txTo, unsigned int nIn, int nHashType)
|
|
{
|
|
assert(nIn < txTo.vin.size());
|
|
const CTxIn& txin = txTo.vin[nIn];
|
|
if (txin.prevout.n >= txFrom.vout.size())
|
|
return false;
|
|
const CTxOut& txout = txFrom.vout[txin.prevout.n];
|
|
|
|
if (txin.prevout.hash != txFrom.GetHash())
|
|
return false;
|
|
|
|
if (!VerifyScript(txin.scriptSig, txout.scriptPubKey, txTo, nIn, nHashType))
|
|
return false;
|
|
|
|
// Anytime a signature is successfully verified, it's proof the outpoint is spent,
|
|
// so lets update the wallet spent flag if it doesn't know due to wallet.dat being
|
|
// restored from backup or the user making copies of wallet.dat.
|
|
WalletUpdateSpent(txin.prevout);
|
|
|
|
return true;
|
|
}
|