src/bench/verify_script.cpp

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