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// Copyright (c) 2013 The Bitcoin Core developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <boost/test/unit_test.hpp>
#include <iostream>
#include "main.h"
#include "util.h"
#include "serialize.h"
#include "version.h"
#include "data/sighash.json.h"
#include "json/json_spirit_reader_template.h"
#include "json/json_spirit_utils.h"
#include "json/json_spirit_writer_template.h"
using namespace json_spirit;
extern Array read_json(const std::string& jsondata);
extern uint256 SignatureHash(const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType);
// Old script.cpp SignatureHash function
uint256 static SignatureHashOld(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 (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())
{
printf("ERROR: SignatureHash() : nOut=%d out of range\n", nOut);
return 1;
}
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
CHashWriter ss(SER_GETHASH, 0);
ss << txTmp << nHashType;
return ss.GetHash();
}
void static 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 = (insecure_rand() % 10);
for (int i=0; i<ops; i++)
script << oplist[insecure_rand() % (sizeof(oplist)/sizeof(oplist[0]))];
}
void static RandomTransaction(CTransaction &tx, bool fSingle) {
tx.nVersion = insecure_rand();
tx.vin.clear();
tx.vout.clear();
tx.nLockTime = (insecure_rand() % 2) ? insecure_rand() : 0;
int ins = (insecure_rand() % 4) + 1;
int outs = fSingle ? ins : (insecure_rand() % 4) + 1;
for (int in = 0; in < ins; in++) {
tx.vin.push_back(CTxIn());
CTxIn &txin = tx.vin.back();
txin.prevout.hash = GetRandHash();
txin.prevout.n = insecure_rand() % 4;
RandomScript(txin.scriptSig);
txin.nSequence = (insecure_rand() % 2) ? insecure_rand() : (unsigned int)-1;
}
for (int out = 0; out < outs; out++) {
tx.vout.push_back(CTxOut());
CTxOut &txout = tx.vout.back();
txout.nValue = insecure_rand() % 100000000;
RandomScript(txout.scriptPubKey);
}
}
BOOST_AUTO_TEST_SUITE(sighash_tests)
BOOST_AUTO_TEST_CASE(sighash_test)
{
seed_insecure_rand(false);
for (int i=0; i<50000; i++) {
int nHashType = insecure_rand();
CTransaction txTo;
RandomTransaction(txTo, (nHashType & 0x1f) == SIGHASH_SINGLE);
CScript scriptCode;
RandomScript(scriptCode);
int nIn = insecure_rand() % txTo.vin.size();
uint256 sh, sho;
sho = SignatureHashOld(scriptCode, txTo, nIn, nHashType);
sh = SignatureHash(scriptCode, txTo, nIn, nHashType);
BOOST_CHECK(sh == sho);
}
}
// Goal: check that SignatureHash generates correct hash
BOOST_AUTO_TEST_CASE(sighash_from_data)
{
Array tests = read_json(std::string(json_tests::sighash, json_tests::sighash + sizeof(json_tests::sighash)));
BOOST_FOREACH(Value& tv, tests)
{
Array test = tv.get_array();
std::string strTest = write_string(tv, false);
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 = test[0].get_str();
std::string raw_script = test[1].get_str();
int nIn = test[2].get_int();
int nHashType = test[3].get_int();
std::string sigHashHex = test[4].get_str();
uint256 sh;
CDataStream stream(ParseHex(raw_tx), SER_NETWORK, PROTOCOL_VERSION);
CTransaction tx;
stream >> tx;
CValidationState state;
BOOST_CHECK_MESSAGE(CheckTransaction(tx, state), strTest);
BOOST_CHECK(state.IsValid());
CScript scriptCode = CScript();
std::vector<unsigned char> raw = ParseHex(raw_script);
scriptCode.insert(scriptCode.end(), raw.begin(), raw.end());
sh = SignatureHash(scriptCode, tx, nIn, nHashType);
BOOST_CHECK_MESSAGE(sh.GetHex() == sigHashHex, strTest);
}
}
BOOST_AUTO_TEST_SUITE_END()
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