src/bench/verify_script.cpp

   1 // Copyright (c) 2016-2017 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 <bench/bench.h>
   6 #include <key.h>
   7 #if defined(HAVE_CONSENSUS_LIB)
   8 #include <script/bitcoinconsensus.h>
   9 #endif
  10 #include <script/script.h>
  11 #include <script/sign.h>
  12 #include <streams.h>
  13
  14 #include <array>
  15
  16 // FIXME: Dedup with BuildCreditingTransaction in test/script_tests.cpp.
  17 static CMutableTransaction BuildCreditingTransaction(const CScript& scriptPubKey)
  18 {
  19     CMutableTransaction txCredit;
  20     txCredit.nVersion = 1;
  21     txCredit.nLockTime = 0;
  22     txCredit.vin.resize(1);
  23     txCredit.vout.resize(1);
  24     txCredit.vin[0].prevout.SetNull();
  25     txCredit.vin[0].scriptSig = CScript() << CScriptNum(0) << CScriptNum(0);
  26     txCredit.vin[0].nSequence = CTxIn::SEQUENCE_FINAL;
  27     txCredit.vout[0].scriptPubKey = scriptPubKey;
  28     txCredit.vout[0].nValue = 1;
  29
  30     return txCredit;
  31 }
  32
  33 // FIXME: Dedup with BuildSpendingTransaction in test/script_tests.cpp.
  34 static CMutableTransaction BuildSpendingTransaction(const CScript& scriptSig, const CMutableTransaction& txCredit)
  35 {
  36     CMutableTransaction txSpend;
  37     txSpend.nVersion = 1;
  38     txSpend.nLockTime = 0;
  39     txSpend.vin.resize(1);
  40     txSpend.vout.resize(1);
  41     txSpend.vin[0].prevout.hash = txCredit.GetHash();
  42     txSpend.vin[0].prevout.n = 0;
  43     txSpend.vin[0].scriptSig = scriptSig;
  44     txSpend.vin[0].nSequence = CTxIn::SEQUENCE_FINAL;
  45     txSpend.vout[0].scriptPubKey = CScript();
  46     txSpend.vout[0].nValue = txCredit.vout[0].nValue;
  47
  48     return txSpend;
  49 }
  50
  51 // Microbenchmark for verification of a basic P2WPKH script. Can be easily
  52 // modified to measure performance of other types of scripts.
  53 static void VerifyScriptBench(benchmark::State& state)
  54 {
  55     const int flags = SCRIPT_VERIFY_WITNESS | SCRIPT_VERIFY_P2SH;
  56     const int witnessversion = 0;
  57
  58     // Keypair.
  59     CKey key;
  60     static const std::array<unsigned char, 32> vchKey = {
  61         {
  62             0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
  63         }
  64     };
  65     key.Set(vchKey.begin(), vchKey.end(), false);
  66     CPubKey pubkey = key.GetPubKey();
  67     uint160 pubkeyHash;
  68     CHash160().Write(pubkey.begin(), pubkey.size()).Finalize(pubkeyHash.begin());
  69
  70     // Script.
  71     CScript scriptPubKey = CScript() << witnessversion << ToByteVector(pubkeyHash);
  72     CScript scriptSig;
  73     CScript witScriptPubkey = CScript() << OP_DUP << OP_HASH160 << ToByteVector(pubkeyHash) << OP_EQUALVERIFY << OP_CHECKSIG;
  74     CTransaction txCredit = BuildCreditingTransaction(scriptPubKey);
  75     CMutableTransaction txSpend = BuildSpendingTransaction(scriptSig, txCredit);
  76     CScriptWitness& witness = txSpend.vin[0].scriptWitness;
  77     witness.stack.emplace_back();
  78     key.Sign(SignatureHash(witScriptPubkey, txSpend, 0, SIGHASH_ALL, txCredit.vout[0].nValue, SIGVERSION_WITNESS_V0), witness.stack.back(), 0);
  79     witness.stack.back().push_back(static_cast<unsigned char>(SIGHASH_ALL));
  80     witness.stack.push_back(ToByteVector(pubkey));
  81
  82     // Benchmark.
  83     while (state.KeepRunning()) {
  84         ScriptError err;
  85         bool success = VerifyScript(
  86             txSpend.vin[0].scriptSig,
  87             txCredit.vout[0].scriptPubKey,
  88             &txSpend.vin[0].scriptWitness,
  89             flags,
  90             MutableTransactionSignatureChecker(&txSpend, 0, txCredit.vout[0].nValue),
  91             &err);
  92         assert(err == SCRIPT_ERR_OK);
  93         assert(success);
  94
  95 #if defined(HAVE_CONSENSUS_LIB)
  96         CDataStream stream(SER_NETWORK, PROTOCOL_VERSION);
  97         stream << txSpend;
  98         int csuccess = bitcoinconsensus_verify_script_with_amount(
  99             txCredit.vout[0].scriptPubKey.data(),
 100             txCredit.vout[0].scriptPubKey.size(),
 101             txCredit.vout[0].nValue,
 102             (const unsigned char*)stream.data(), stream.size(), 0, flags, nullptr);
 103         assert(csuccess == 1);
 104 #endif
 105     }
 106 }
 107
 108 BENCHMARK(VerifyScriptBench, 6300);