src/test/sigopcount_tests.cpp

   1 // Copyright (c) 2012-2016 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 "pubkey.h"
   7 #include "key.h"
   8 #include "script/script.h"
   9 #include "script/standard.h"
  10 #include "uint256.h"
  11 #include "test/test_bitcoin.h"
  12
  13 #include <vector>
  14
  15 #include <boost/test/unit_test.hpp>
  16
  17 // Helpers:
  18 static std::vector<unsigned char>
  19 Serialize(const CScript& s)
  20 {
  21     std::vector<unsigned char> sSerialized(s.begin(), s.end());
  22     return sSerialized;
  23 }
  24
  25 BOOST_FIXTURE_TEST_SUITE(sigopcount_tests, BasicTestingSetup)
  26
  27 BOOST_AUTO_TEST_CASE(GetSigOpCount)
  28 {
  29     // Test CScript::GetSigOpCount()
  30     CScript s1;
  31     BOOST_CHECK_EQUAL(s1.GetSigOpCount(false), 0U);
  32     BOOST_CHECK_EQUAL(s1.GetSigOpCount(true), 0U);
  33
  34     uint160 dummy;
  35     s1 << OP_1 << ToByteVector(dummy) << ToByteVector(dummy) << OP_2 << OP_CHECKMULTISIG;
  36     BOOST_CHECK_EQUAL(s1.GetSigOpCount(true), 2U);
  37     s1 << OP_IF << OP_CHECKSIG << OP_ENDIF;
  38     BOOST_CHECK_EQUAL(s1.GetSigOpCount(true), 3U);
  39     BOOST_CHECK_EQUAL(s1.GetSigOpCount(false), 21U);
  40
  41     CScript p2sh = GetScriptForDestination(CScriptID(s1));
  42     CScript scriptSig;
  43     scriptSig << OP_0 << Serialize(s1);
  44     BOOST_CHECK_EQUAL(p2sh.GetSigOpCount(scriptSig), 3U);
  45
  46     std::vector<CPubKey> keys;
  47     for (int i = 0; i < 3; i++)
  48     {
  49         CKey k;
  50         k.MakeNewKey(true);
  51         keys.push_back(k.GetPubKey());
  52     }
  53     CScript s2 = GetScriptForMultisig(1, keys);
  54     BOOST_CHECK_EQUAL(s2.GetSigOpCount(true), 3U);
  55     BOOST_CHECK_EQUAL(s2.GetSigOpCount(false), 20U);
  56
  57     p2sh = GetScriptForDestination(CScriptID(s2));
  58     BOOST_CHECK_EQUAL(p2sh.GetSigOpCount(true), 0U);
  59     BOOST_CHECK_EQUAL(p2sh.GetSigOpCount(false), 0U);
  60     CScript scriptSig2;
  61     scriptSig2 << OP_1 << ToByteVector(dummy) << ToByteVector(dummy) << Serialize(s2);
  62     BOOST_CHECK_EQUAL(p2sh.GetSigOpCount(scriptSig2), 3U);
  63 }
  64
  65 /**
  66  * Verifies script execution of the zeroth scriptPubKey of tx output and
  67  * zeroth scriptSig and witness of tx input.
  68  */
  69 ScriptError VerifyWithFlag(const CTransaction& output, const CMutableTransaction& input, int flags)
  70 {
  71     ScriptError error;
  72     CTransaction inputi(input);
  73     bool ret = VerifyScript(inputi.vin[0].scriptSig, output.vout[0].scriptPubKey, &inputi.vin[0].scriptWitness, flags, TransactionSignatureChecker(&inputi, 0, output.vout[0].nValue), &error);
  74     BOOST_CHECK((ret == true) == (error == SCRIPT_ERR_OK));
  75
  76     return error;
  77 }
  78
  79 /**
  80  * Builds a creationTx from scriptPubKey and a spendingTx from scriptSig
  81  * and witness such that spendingTx spends output zero of creationTx.
  82  * Also inserts creationTx's output into the coins view.
  83  */
  84 void BuildTxs(CMutableTransaction& spendingTx, CCoinsViewCache& coins, CMutableTransaction& creationTx, const CScript& scriptPubKey, const CScript& scriptSig, const CScriptWitness& witness)
  85 {
  86     creationTx.nVersion = 1;
  87     creationTx.vin.resize(1);
  88     creationTx.vin[0].prevout.SetNull();
  89     creationTx.vin[0].scriptSig = CScript();
  90     creationTx.vout.resize(1);
  91     creationTx.vout[0].nValue = 1;
  92     creationTx.vout[0].scriptPubKey = scriptPubKey;
  93
  94     spendingTx.nVersion = 1;
  95     spendingTx.vin.resize(1);
  96     spendingTx.vin[0].prevout.hash = creationTx.GetHash();
  97     spendingTx.vin[0].prevout.n = 0;
  98     spendingTx.vin[0].scriptSig = scriptSig;
  99     spendingTx.vin[0].scriptWitness = witness;
 100     spendingTx.vout.resize(1);
 101     spendingTx.vout[0].nValue = 1;
 102     spendingTx.vout[0].scriptPubKey = CScript();
 103
 104     AddCoins(coins, creationTx, 0);
 105 }
 106
 107 BOOST_AUTO_TEST_CASE(GetTxSigOpCost)
 108 {
 109     // Transaction creates outputs
 110     CMutableTransaction creationTx;
 111     // Transaction that spends outputs and whose
 112     // sig op cost is going to be tested
 113     CMutableTransaction spendingTx;
 114
 115     // Create utxo set
 116     CCoinsView coinsDummy;
 117     CCoinsViewCache coins(&coinsDummy);
 118     // Create key
 119     CKey key;
 120     key.MakeNewKey(true);
 121     CPubKey pubkey = key.GetPubKey();
 122     // Default flags
 123     int flags = SCRIPT_VERIFY_WITNESS | SCRIPT_VERIFY_P2SH;
 124
 125     // Multisig script (legacy counting)
 126     {
 127         CScript scriptPubKey = CScript() << 1 << ToByteVector(pubkey) << ToByteVector(pubkey) << 2 << OP_CHECKMULTISIGVERIFY;
 128         // Do not use a valid signature to avoid using wallet operations.
 129         CScript scriptSig = CScript() << OP_0 << OP_0;
 130
 131         BuildTxs(spendingTx, coins, creationTx, scriptPubKey, scriptSig, CScriptWitness());
 132         // Legacy counting only includes signature operations in scriptSigs and scriptPubKeys
 133         // of a transaction and does not take the actual executed sig operations into account.
 134         // spendingTx in itself does not contain a signature operation.
 135         assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags) == 0);
 136         // creationTx contains two signature operations in its scriptPubKey, but legacy counting
 137         // is not accurate.
 138         assert(GetTransactionSigOpCost(CTransaction(creationTx), coins, flags) == MAX_PUBKEYS_PER_MULTISIG * WITNESS_SCALE_FACTOR);
 139         // Sanity check: script verification fails because of an invalid signature.
 140         assert(VerifyWithFlag(creationTx, spendingTx, flags) == SCRIPT_ERR_CHECKMULTISIGVERIFY);
 141     }
 142
 143     // Multisig nested in P2SH
 144     {
 145         CScript redeemScript = CScript() << 1 << ToByteVector(pubkey) << ToByteVector(pubkey) << 2 << OP_CHECKMULTISIGVERIFY;
 146         CScript scriptPubKey = GetScriptForDestination(CScriptID(redeemScript));
 147         CScript scriptSig = CScript() << OP_0 << OP_0 << ToByteVector(redeemScript);
 148
 149         BuildTxs(spendingTx, coins, creationTx, scriptPubKey, scriptSig, CScriptWitness());
 150         assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags) == 2 * WITNESS_SCALE_FACTOR);
 151         assert(VerifyWithFlag(creationTx, spendingTx, flags) == SCRIPT_ERR_CHECKMULTISIGVERIFY);
 152     }
 153
 154     // P2WPKH witness program
 155     {
 156         CScript p2pk = CScript() << ToByteVector(pubkey) << OP_CHECKSIG;
 157         CScript scriptPubKey = GetScriptForWitness(p2pk);
 158         CScript scriptSig = CScript();
 159         CScriptWitness scriptWitness;
 160         scriptWitness.stack.push_back(std::vector<unsigned char>(0));
 161         scriptWitness.stack.push_back(std::vector<unsigned char>(0));
 162
 163
 164         BuildTxs(spendingTx, coins, creationTx, scriptPubKey, scriptSig, scriptWitness);
 165         assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags) == 1);
 166         // No signature operations if we don't verify the witness.
 167         assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags & ~SCRIPT_VERIFY_WITNESS) == 0);
 168         assert(VerifyWithFlag(creationTx, spendingTx, flags) == SCRIPT_ERR_EQUALVERIFY);
 169
 170         // The sig op cost for witness version != 0 is zero.
 171         assert(scriptPubKey[0] == 0x00);
 172         scriptPubKey[0] = 0x51;
 173         BuildTxs(spendingTx, coins, creationTx, scriptPubKey, scriptSig, scriptWitness);
 174         assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags) == 0);
 175         scriptPubKey[0] = 0x00;
 176         BuildTxs(spendingTx, coins, creationTx, scriptPubKey, scriptSig, scriptWitness);
 177
 178         // The witness of a coinbase transaction is not taken into account.
 179         spendingTx.vin[0].prevout.SetNull();
 180         assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags) == 0);
 181     }
 182
 183     // P2WPKH nested in P2SH
 184     {
 185         CScript p2pk = CScript() << ToByteVector(pubkey) << OP_CHECKSIG;
 186         CScript scriptSig = GetScriptForWitness(p2pk);
 187         CScript scriptPubKey = GetScriptForDestination(CScriptID(scriptSig));
 188         scriptSig = CScript() << ToByteVector(scriptSig);
 189         CScriptWitness scriptWitness;
 190         scriptWitness.stack.push_back(std::vector<unsigned char>(0));
 191         scriptWitness.stack.push_back(std::vector<unsigned char>(0));
 192
 193         BuildTxs(spendingTx, coins, creationTx, scriptPubKey, scriptSig, scriptWitness);
 194         assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags) == 1);
 195         assert(VerifyWithFlag(creationTx, spendingTx, flags) == SCRIPT_ERR_EQUALVERIFY);
 196     }
 197
 198     // P2WSH witness program
 199     {
 200         CScript witnessScript = CScript() << 1 << ToByteVector(pubkey) << ToByteVector(pubkey) << 2 << OP_CHECKMULTISIGVERIFY;
 201         CScript scriptPubKey = GetScriptForWitness(witnessScript);
 202         CScript scriptSig = CScript();
 203         CScriptWitness scriptWitness;
 204         scriptWitness.stack.push_back(std::vector<unsigned char>(0));
 205         scriptWitness.stack.push_back(std::vector<unsigned char>(0));
 206         scriptWitness.stack.push_back(std::vector<unsigned char>(witnessScript.begin(), witnessScript.end()));
 207
 208         BuildTxs(spendingTx, coins, creationTx, scriptPubKey, scriptSig, scriptWitness);
 209         assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags) == 2);
 210         assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags & ~SCRIPT_VERIFY_WITNESS) == 0);
 211         assert(VerifyWithFlag(creationTx, spendingTx, flags) == SCRIPT_ERR_CHECKMULTISIGVERIFY);
 212     }
 213
 214     // P2WSH nested in P2SH
 215     {
 216         CScript witnessScript = CScript() << 1 << ToByteVector(pubkey) << ToByteVector(pubkey) << 2 << OP_CHECKMULTISIGVERIFY;
 217         CScript redeemScript = GetScriptForWitness(witnessScript);
 218         CScript scriptPubKey = GetScriptForDestination(CScriptID(redeemScript));
 219         CScript scriptSig = CScript() << ToByteVector(redeemScript);
 220         CScriptWitness scriptWitness;
 221         scriptWitness.stack.push_back(std::vector<unsigned char>(0));
 222         scriptWitness.stack.push_back(std::vector<unsigned char>(0));
 223         scriptWitness.stack.push_back(std::vector<unsigned char>(witnessScript.begin(), witnessScript.end()));
 224
 225         BuildTxs(spendingTx, coins, creationTx, scriptPubKey, scriptSig, scriptWitness);
 226         assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags) == 2);
 227         assert(VerifyWithFlag(creationTx, spendingTx, flags) == SCRIPT_ERR_CHECKMULTISIGVERIFY);
 228     }
 229 }
 230
 231 BOOST_AUTO_TEST_SUITE_END()