src/test/sighash_tests.cpp

   1 // Copyright (c) 2013-2017 The Bitcoin Core developers
   2 // Distributed under the MIT software license, see the accompanying
   3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   4
   5 #include <consensus/tx_verify.h>
   6 #include <consensus/validation.h>
   7 #include <test/data/sighash.json.h>
   8 #include <hash.h>
   9 #include <script/interpreter.h>
  10 #include <script/script.h>
  11 #include <serialize.h>
  12 #include <streams.h>
  13 #include <test/test_bitcoin.h>
  14 #include <util.h>
  15 #include <utilstrencodings.h>
  16 #include <version.h>
  17
  18 #include <iostream>
  19
  20 #include <boost/test/unit_test.hpp>
  21
  22 #include <univalue.h>
  23
  24 extern UniValue read_json(const std::string& jsondata);
  25
  26 // Old script.cpp SignatureHash function
  27 uint256 static SignatureHashOld(CScript scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType)
  28 {
  29     static const uint256 one(uint256S("0000000000000000000000000000000000000000000000000000000000000001"));
  30     if (nIn >= txTo.vin.size())
  31     {
  32         return one;
  33     }
  34     CMutableTransaction txTmp(txTo);
  35
  36     // In case concatenating two scripts ends up with two codeseparators,
  37     // or an extra one at the end, this prevents all those possible incompatibilities.
  38     scriptCode.FindAndDelete(CScript(OP_CODESEPARATOR));
  39
  40     // Blank out other inputs' signatures
  41     for (unsigned int i = 0; i < txTmp.vin.size(); i++)
  42         txTmp.vin[i].scriptSig = CScript();
  43     txTmp.vin[nIn].scriptSig = scriptCode;
  44
  45     // Blank out some of the outputs
  46     if ((nHashType & 0x1f) == SIGHASH_NONE)
  47     {
  48         // Wildcard payee
  49         txTmp.vout.clear();
  50
  51         // Let the others update at will
  52         for (unsigned int i = 0; i < txTmp.vin.size(); i++)
  53             if (i != nIn)
  54                 txTmp.vin[i].nSequence = 0;
  55     }
  56     else if ((nHashType & 0x1f) == SIGHASH_SINGLE)
  57     {
  58         // Only lock-in the txout payee at same index as txin
  59         unsigned int nOut = nIn;
  60         if (nOut >= txTmp.vout.size())
  61         {
  62             return one;
  63         }
  64         txTmp.vout.resize(nOut+1);
  65         for (unsigned int i = 0; i < nOut; i++)
  66             txTmp.vout[i].SetNull();
  67
  68         // Let the others update at will
  69         for (unsigned int i = 0; i < txTmp.vin.size(); i++)
  70             if (i != nIn)
  71                 txTmp.vin[i].nSequence = 0;
  72     }
  73
  74     // Blank out other inputs completely, not recommended for open transactions
  75     if (nHashType & SIGHASH_ANYONECANPAY)
  76     {
  77         txTmp.vin[0] = txTmp.vin[nIn];
  78         txTmp.vin.resize(1);
  79     }
  80
  81     // Serialize and hash
  82     CHashWriter ss(SER_GETHASH, SERIALIZE_TRANSACTION_NO_WITNESS);
  83     ss << txTmp << nHashType;
  84     return ss.GetHash();
  85 }
  86
  87 void static RandomScript(CScript &script) {
  88     static const opcodetype oplist[] = {OP_FALSE, OP_1, OP_2, OP_3, OP_CHECKSIG, OP_IF, OP_VERIF, OP_RETURN, OP_CODESEPARATOR};
  89     script = CScript();
  90     int ops = (InsecureRandRange(10));
  91     for (int i=0; i<ops; i++)
  92         script << oplist[InsecureRandRange(sizeof(oplist)/sizeof(oplist[0]))];
  93 }
  94
  95 void static RandomTransaction(CMutableTransaction &tx, bool fSingle) {
  96     tx.nVersion = InsecureRand32();
  97     tx.vin.clear();
  98     tx.vout.clear();
  99     tx.nLockTime = (InsecureRandBool()) ? InsecureRand32() : 0;
 100     int ins = (InsecureRandBits(2)) + 1;
 101     int outs = fSingle ? ins : (InsecureRandBits(2)) + 1;
 102     for (int in = 0; in < ins; in++) {
 103         tx.vin.push_back(CTxIn());
 104         CTxIn &txin = tx.vin.back();
 105         txin.prevout.hash = InsecureRand256();
 106         txin.prevout.n = InsecureRandBits(2);
 107         RandomScript(txin.scriptSig);
 108         txin.nSequence = (InsecureRandBool()) ? InsecureRand32() : (unsigned int)-1;
 109     }
 110     for (int out = 0; out < outs; out++) {
 111         tx.vout.push_back(CTxOut());
 112         CTxOut &txout = tx.vout.back();
 113         txout.nValue = InsecureRandRange(100000000);
 114         RandomScript(txout.scriptPubKey);
 115     }
 116 }
 117
 118 BOOST_FIXTURE_TEST_SUITE(sighash_tests, BasicTestingSetup)
 119
 120 BOOST_AUTO_TEST_CASE(sighash_test)
 121 {
 122     SeedInsecureRand(false);
 123
 124     #if defined(PRINT_SIGHASH_JSON)
 125     std::cout << "[\n";
 126     std::cout << "\t[\"raw_transaction, script, input_index, hashType, signature_hash (result)\"],\n";
 127     int nRandomTests = 500;
 128     #else
 129     int nRandomTests = 50000;
 130     #endif
 131     for (int i=0; i<nRandomTests; i++) {
 132         int nHashType = InsecureRand32();
 133         CMutableTransaction txTo;
 134         RandomTransaction(txTo, (nHashType & 0x1f) == SIGHASH_SINGLE);
 135         CScript scriptCode;
 136         RandomScript(scriptCode);
 137         int nIn = InsecureRandRange(txTo.vin.size());
 138
 139         uint256 sh, sho;
 140         sho = SignatureHashOld(scriptCode, txTo, nIn, nHashType);
 141         sh = SignatureHash(scriptCode, txTo, nIn, nHashType, 0, SIGVERSION_BASE);
 142         #if defined(PRINT_SIGHASH_JSON)
 143         CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
 144         ss << txTo;
 145
 146         std::cout << "\t[\"" ;
 147         std::cout << HexStr(ss.begin(), ss.end()) << "\", \"";
 148         std::cout << HexStr(scriptCode) << "\", ";
 149         std::cout << nIn << ", ";
 150         std::cout << nHashType << ", \"";
 151         std::cout << sho.GetHex() << "\"]";
 152         if (i+1 != nRandomTests) {
 153           std::cout << ",";
 154         }
 155         std::cout << "\n";
 156         #endif
 157         BOOST_CHECK(sh == sho);
 158     }
 159     #if defined(PRINT_SIGHASH_JSON)
 160     std::cout << "]\n";
 161     #endif
 162 }
 163
 164 // Goal: check that SignatureHash generates correct hash
 165 BOOST_AUTO_TEST_CASE(sighash_from_data)
 166 {
 167     UniValue tests = read_json(std::string(json_tests::sighash, json_tests::sighash + sizeof(json_tests::sighash)));
 168
 169     for (unsigned int idx = 0; idx < tests.size(); idx++) {
 170         UniValue test = tests[idx];
 171         std::string strTest = test.write();
 172         if (test.size() < 1) // Allow for extra stuff (useful for comments)
 173         {
 174             BOOST_ERROR("Bad test: " << strTest);
 175             continue;
 176         }
 177         if (test.size() == 1) continue; // comment
 178
 179         std::string raw_tx, raw_script, sigHashHex;
 180         int nIn, nHashType;
 181         uint256 sh;
 182         CTransactionRef tx;
 183         CScript scriptCode = CScript();
 184
 185         try {
 186           // deserialize test data
 187           raw_tx = test[0].get_str();
 188           raw_script = test[1].get_str();
 189           nIn = test[2].get_int();
 190           nHashType = test[3].get_int();
 191           sigHashHex = test[4].get_str();
 192
 193           CDataStream stream(ParseHex(raw_tx), SER_NETWORK, PROTOCOL_VERSION);
 194           stream >> tx;
 195
 196           CValidationState state;
 197           BOOST_CHECK_MESSAGE(CheckTransaction(*tx, state), strTest);
 198           BOOST_CHECK(state.IsValid());
 199
 200           std::vector<unsigned char> raw = ParseHex(raw_script);
 201           scriptCode.insert(scriptCode.end(), raw.begin(), raw.end());
 202         } catch (...) {
 203           BOOST_ERROR("Bad test, couldn't deserialize data: " << strTest);
 204           continue;
 205         }
 206
 207         sh = SignatureHash(scriptCode, *tx, nIn, nHashType, 0, SIGVERSION_BASE);
 208         BOOST_CHECK_MESSAGE(sh.GetHex() == sigHashHex, strTest);
 209     }
 210 }
 211 BOOST_AUTO_TEST_SUITE_END()