325 lines
9.9 KiB
C++
325 lines
9.9 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2016 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include "script/standard.h"
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#include "pubkey.h"
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#include "script/script.h"
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#include "util.h"
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#include "utilstrencodings.h"
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#include <boost/foreach.hpp>
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using namespace std;
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typedef vector<unsigned char> valtype;
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bool fAcceptDatacarrier = DEFAULT_ACCEPT_DATACARRIER;
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unsigned nMaxDatacarrierBytes = MAX_OP_RETURN_RELAY;
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CScriptID::CScriptID(const CScript& in) : uint160(Hash160(in.begin(), in.end())) {}
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const char* GetTxnOutputType(txnouttype t)
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{
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switch (t)
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{
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case TX_NONSTANDARD: return "nonstandard";
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case TX_PUBKEY: return "pubkey";
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case TX_PUBKEYHASH: return "pubkeyhash";
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case TX_SCRIPTHASH: return "scripthash";
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case TX_MULTISIG: return "multisig";
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case TX_NULL_DATA: return "nulldata";
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case TX_WITNESS_V0_KEYHASH: return "witness_v0_keyhash";
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case TX_WITNESS_V0_SCRIPTHASH: return "witness_v0_scripthash";
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}
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return NULL;
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}
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/**
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* Return public keys or hashes from scriptPubKey, for 'standard' transaction types.
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*/
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bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, vector<vector<unsigned char> >& vSolutionsRet)
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{
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// Templates
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static multimap<txnouttype, CScript> mTemplates;
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if (mTemplates.empty())
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{
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// Standard tx, sender provides pubkey, receiver adds signature
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mTemplates.insert(make_pair(TX_PUBKEY, CScript() << OP_PUBKEY << OP_CHECKSIG));
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// Bitcoin address tx, sender provides hash of pubkey, receiver provides signature and pubkey
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mTemplates.insert(make_pair(TX_PUBKEYHASH, CScript() << OP_DUP << OP_HASH160 << OP_PUBKEYHASH << OP_EQUALVERIFY << OP_CHECKSIG));
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// Sender provides N pubkeys, receivers provides M signatures
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mTemplates.insert(make_pair(TX_MULTISIG, CScript() << OP_SMALLINTEGER << OP_PUBKEYS << OP_SMALLINTEGER << OP_CHECKMULTISIG));
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}
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vSolutionsRet.clear();
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// Shortcut for pay-to-script-hash, which are more constrained than the other types:
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// it is always OP_HASH160 20 [20 byte hash] OP_EQUAL
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if (scriptPubKey.IsPayToScriptHash())
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{
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typeRet = TX_SCRIPTHASH;
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vector<unsigned char> hashBytes(scriptPubKey.begin()+2, scriptPubKey.begin()+22);
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vSolutionsRet.push_back(hashBytes);
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return true;
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}
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int witnessversion;
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std::vector<unsigned char> witnessprogram;
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if (scriptPubKey.IsWitnessProgram(witnessversion, witnessprogram)) {
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if (witnessversion == 0 && witnessprogram.size() == 20) {
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typeRet = TX_WITNESS_V0_KEYHASH;
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vSolutionsRet.push_back(witnessprogram);
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return true;
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}
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if (witnessversion == 0 && witnessprogram.size() == 32) {
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typeRet = TX_WITNESS_V0_SCRIPTHASH;
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vSolutionsRet.push_back(witnessprogram);
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return true;
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}
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return false;
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}
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// Provably prunable, data-carrying output
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//
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// So long as script passes the IsUnspendable() test and all but the first
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// byte passes the IsPushOnly() test we don't care what exactly is in the
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// script.
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if (scriptPubKey.size() >= 1 && scriptPubKey[0] == OP_RETURN && scriptPubKey.IsPushOnly(scriptPubKey.begin()+1)) {
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typeRet = TX_NULL_DATA;
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return true;
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}
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// Scan templates
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const CScript& script1 = scriptPubKey;
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BOOST_FOREACH(const PAIRTYPE(txnouttype, CScript)& tplate, mTemplates)
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{
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const CScript& script2 = tplate.second;
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vSolutionsRet.clear();
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opcodetype opcode1, opcode2;
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vector<unsigned char> vch1, vch2;
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// Compare
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CScript::const_iterator pc1 = script1.begin();
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CScript::const_iterator pc2 = script2.begin();
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while (true)
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{
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if (pc1 == script1.end() && pc2 == script2.end())
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{
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// Found a match
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typeRet = tplate.first;
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if (typeRet == TX_MULTISIG)
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{
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// Additional checks for TX_MULTISIG:
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unsigned char m = vSolutionsRet.front()[0];
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unsigned char n = vSolutionsRet.back()[0];
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if (m < 1 || n < 1 || m > n || vSolutionsRet.size()-2 != n)
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return false;
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}
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return true;
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}
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if (!script1.GetOp(pc1, opcode1, vch1))
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break;
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if (!script2.GetOp(pc2, opcode2, vch2))
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break;
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// Template matching opcodes:
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if (opcode2 == OP_PUBKEYS)
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{
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while (vch1.size() >= 33 && vch1.size() <= 65)
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{
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vSolutionsRet.push_back(vch1);
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if (!script1.GetOp(pc1, opcode1, vch1))
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break;
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}
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if (!script2.GetOp(pc2, opcode2, vch2))
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break;
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// Normal situation is to fall through
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// to other if/else statements
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}
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if (opcode2 == OP_PUBKEY)
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{
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if (vch1.size() < 33 || vch1.size() > 65)
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break;
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vSolutionsRet.push_back(vch1);
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}
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else if (opcode2 == OP_PUBKEYHASH)
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{
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if (vch1.size() != sizeof(uint160))
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break;
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vSolutionsRet.push_back(vch1);
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}
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else if (opcode2 == OP_SMALLINTEGER)
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{ // Single-byte small integer pushed onto vSolutions
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if (opcode1 == OP_0 ||
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(opcode1 >= OP_1 && opcode1 <= OP_16))
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{
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char n = (char)CScript::DecodeOP_N(opcode1);
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vSolutionsRet.push_back(valtype(1, n));
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}
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else
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break;
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}
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else if (opcode1 != opcode2 || vch1 != vch2)
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{
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// Others must match exactly
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break;
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}
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}
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}
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vSolutionsRet.clear();
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typeRet = TX_NONSTANDARD;
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return false;
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}
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bool ExtractDestination(const CScript& scriptPubKey, CTxDestination& addressRet)
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{
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vector<valtype> vSolutions;
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txnouttype whichType;
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if (!Solver(scriptPubKey, whichType, vSolutions))
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return false;
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if (whichType == TX_PUBKEY)
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{
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CPubKey pubKey(vSolutions[0]);
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if (!pubKey.IsValid())
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return false;
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addressRet = pubKey.GetID();
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return true;
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}
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else if (whichType == TX_PUBKEYHASH)
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{
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addressRet = CKeyID(uint160(vSolutions[0]));
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return true;
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}
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else if (whichType == TX_SCRIPTHASH)
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{
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addressRet = CScriptID(uint160(vSolutions[0]));
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return true;
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}
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// Multisig txns have more than one address...
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return false;
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}
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bool ExtractDestinations(const CScript& scriptPubKey, txnouttype& typeRet, vector<CTxDestination>& addressRet, int& nRequiredRet)
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{
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addressRet.clear();
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typeRet = TX_NONSTANDARD;
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vector<valtype> vSolutions;
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if (!Solver(scriptPubKey, typeRet, vSolutions))
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return false;
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if (typeRet == TX_NULL_DATA){
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// This is data, not addresses
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return false;
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}
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if (typeRet == TX_MULTISIG)
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{
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nRequiredRet = vSolutions.front()[0];
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for (unsigned int i = 1; i < vSolutions.size()-1; i++)
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{
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CPubKey pubKey(vSolutions[i]);
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if (!pubKey.IsValid())
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continue;
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CTxDestination address = pubKey.GetID();
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addressRet.push_back(address);
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}
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if (addressRet.empty())
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return false;
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}
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else
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{
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nRequiredRet = 1;
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CTxDestination address;
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if (!ExtractDestination(scriptPubKey, address))
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return false;
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addressRet.push_back(address);
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}
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return true;
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}
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namespace
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{
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class CScriptVisitor : public boost::static_visitor<bool>
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{
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private:
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CScript *script;
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public:
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CScriptVisitor(CScript *scriptin) { script = scriptin; }
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bool operator()(const CNoDestination &dest) const {
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script->clear();
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return false;
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}
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bool operator()(const CKeyID &keyID) const {
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script->clear();
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*script << OP_DUP << OP_HASH160 << ToByteVector(keyID) << OP_EQUALVERIFY << OP_CHECKSIG;
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return true;
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}
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bool operator()(const CScriptID &scriptID) const {
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script->clear();
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*script << OP_HASH160 << ToByteVector(scriptID) << OP_EQUAL;
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return true;
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}
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};
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}
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CScript GetScriptForDestination(const CTxDestination& dest)
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{
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CScript script;
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boost::apply_visitor(CScriptVisitor(&script), dest);
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return script;
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}
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CScript GetScriptForRawPubKey(const CPubKey& pubKey)
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{
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return CScript() << std::vector<unsigned char>(pubKey.begin(), pubKey.end()) << OP_CHECKSIG;
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}
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CScript GetScriptForMultisig(int nRequired, const std::vector<CPubKey>& keys)
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{
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CScript script;
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script << CScript::EncodeOP_N(nRequired);
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BOOST_FOREACH(const CPubKey& key, keys)
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script << ToByteVector(key);
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script << CScript::EncodeOP_N(keys.size()) << OP_CHECKMULTISIG;
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return script;
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}
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CScript GetScriptForWitness(const CScript& redeemscript)
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{
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CScript ret;
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txnouttype typ;
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std::vector<std::vector<unsigned char> > vSolutions;
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if (Solver(redeemscript, typ, vSolutions)) {
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if (typ == TX_PUBKEY) {
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unsigned char h160[20];
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CHash160().Write(&vSolutions[0][0], vSolutions[0].size()).Finalize(h160);
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ret << OP_0 << std::vector<unsigned char>(&h160[0], &h160[20]);
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return ret;
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} else if (typ == TX_PUBKEYHASH) {
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ret << OP_0 << vSolutions[0];
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return ret;
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}
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}
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uint256 hash;
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CSHA256().Write(&redeemscript[0], redeemscript.size()).Finalize(hash.begin());
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ret << OP_0 << ToByteVector(hash);
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return ret;
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}
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