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// Copyright (c) 2013-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <common/system.h>
#include <consensus/tx_check.h>
#include <consensus/validation.h>
#include <hash.h>
#include <script/interpreter.h>
#include <script/script.h>
#include <serialize.h>
#include <streams.h>
#include <test/data/sighash.json.h>
#include <test/util/json.h>
#include <test/util/random.h>
#include <test/util/setup_common.h>
#include <util/strencodings.h>
#include <iostream>
#include <boost/test/unit_test.hpp>
#include <univalue.h>
// Old script.cpp SignatureHash function
uint256 static SignatureHashOld(CScript scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType)
{
if (nIn >= txTo.vin.size())
{
return uint256::ONE;
}
CMutableTransaction 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.
FindAndDelete(scriptCode, CScript(OP_CODESEPARATOR));
// Blank out other inputs' signatures
for (unsigned 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 (unsigned int i = 0; i < txTmp.vin.size(); i++)
if (i != nIn)
txTmp.vin[i].nSequence = 0;
}
else if ((nHashType & 0x1f) == SIGHASH_SINGLE)
{
// Only lock-in the txout payee at same index as txin
unsigned int nOut = nIn;
if (nOut >= txTmp.vout.size())
{
return uint256::ONE;
}
txTmp.vout.resize(nOut+1);
for (unsigned int i = 0; i < nOut; i++)
txTmp.vout[i].SetNull();
// Let the others update at will
for (unsigned 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
HashWriter ss{};
ss << TX_NO_WITNESS(txTmp) << nHashType;
return ss.GetHash();
}
struct SigHashTest : BasicTestingSetup {
void RandomScript(CScript &script) {
static const opcodetype oplist[] = {OP_FALSE, OP_1, OP_2, OP_3, OP_CHECKSIG, OP_IF, OP_VERIF, OP_RETURN, OP_CODESEPARATOR};
script = CScript();
int ops = (m_rng.randrange(10));
for (int i=0; i<ops; i++)
script << oplist[m_rng.randrange(std::size(oplist))];
}
void RandomTransaction(CMutableTransaction& tx, bool fSingle)
{
tx.version = m_rng.rand32();
tx.vin.clear();
tx.vout.clear();
tx.nLockTime = (m_rng.randbool()) ? m_rng.rand32() : 0;
int ins = (m_rng.randbits(2)) + 1;
int outs = fSingle ? ins : (m_rng.randbits(2)) + 1;
for (int in = 0; in < ins; in++) {
tx.vin.emplace_back();
CTxIn &txin = tx.vin.back();
txin.prevout.hash = Txid::FromUint256(m_rng.rand256());
txin.prevout.n = m_rng.randbits(2);
RandomScript(txin.scriptSig);
txin.nSequence = (m_rng.randbool()) ? m_rng.rand32() : std::numeric_limits<uint32_t>::max();
}
for (int out = 0; out < outs; out++) {
tx.vout.emplace_back();
CTxOut &txout = tx.vout.back();
txout.nValue = RandMoney(m_rng);
RandomScript(txout.scriptPubKey);
}
}
}; // struct SigHashTest
BOOST_FIXTURE_TEST_SUITE(sighash_tests, SigHashTest)
BOOST_AUTO_TEST_CASE(sighash_test)
{
#if defined(PRINT_SIGHASH_JSON)
std::cout << "[\n";
std::cout << "\t[\"raw_transaction, script, input_index, hashType, signature_hash (result)\"],\n";
int nRandomTests = 500;
#else
int nRandomTests = 50000;
#endif
for (int i=0; i<nRandomTests; i++) {
int nHashType{int(m_rng.rand32())};
CMutableTransaction txTo;
RandomTransaction(txTo, (nHashType & 0x1f) == SIGHASH_SINGLE);
CScript scriptCode;
RandomScript(scriptCode);
int nIn = m_rng.randrange(txTo.vin.size());
uint256 sh, sho;
sho = SignatureHashOld(scriptCode, CTransaction(txTo), nIn, nHashType);
sh = SignatureHash(scriptCode, txTo, nIn, nHashType, 0, SigVersion::BASE);
#if defined(PRINT_SIGHASH_JSON)
DataStream ss;
ss << TX_WITH_WITNESS(txTo);
std::cout << "\t[\"" ;
std::cout << HexStr(ss) << "\", \"";
std::cout << HexStr(scriptCode) << "\", ";
std::cout << nIn << ", ";
std::cout << nHashType << ", \"";
std::cout << sho.GetHex() << "\"]";
if (i+1 != nRandomTests) {
std::cout << ",";
}
std::cout << "\n";
#endif
BOOST_CHECK(sh == sho);
}
#if defined(PRINT_SIGHASH_JSON)
std::cout << "]\n";
#endif
}
// Goal: check that SignatureHash generates correct hash
BOOST_AUTO_TEST_CASE(sighash_from_data)
{
UniValue tests = read_json(json_tests::sighash);
for (unsigned int idx = 0; idx < tests.size(); idx++) {
const UniValue& test = tests[idx];
std::string strTest = test.write();
if (test.size() < 1) // Allow for extra stuff (useful for comments)
{
BOOST_ERROR("Bad test: " << strTest);
continue;
}
if (test.size() == 1) continue; // comment
std::string raw_tx, raw_script, sigHashHex;
int nIn, nHashType;
uint256 sh;
CTransactionRef tx;
CScript scriptCode = CScript();
try {
// deserialize test data
raw_tx = test[0].get_str();
raw_script = test[1].get_str();
nIn = test[2].getInt<int>();
nHashType = test[3].getInt<int>();
sigHashHex = test[4].get_str();
DataStream stream(ParseHex(raw_tx));
stream >> TX_WITH_WITNESS(tx);
TxValidationState state;
BOOST_CHECK_MESSAGE(CheckTransaction(*tx, state), strTest);
BOOST_CHECK(state.IsValid());
std::vector<unsigned char> raw = ParseHex(raw_script);
scriptCode.insert(scriptCode.end(), raw.begin(), raw.end());
} catch (...) {
BOOST_ERROR("Bad test, couldn't deserialize data: " << strTest);
continue;
}
sh = SignatureHash(scriptCode, *tx, nIn, nHashType, 0, SigVersion::BASE);
BOOST_CHECK_MESSAGE(sh.GetHex() == sigHashHex, strTest);
}
}
BOOST_AUTO_TEST_SUITE_END()
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