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// Copyright (c) 2016 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include "bench.h"
#include "key.h"
#if defined(HAVE_CONSENSUS_LIB)
#include "script/bitcoinconsensus.h"
#endif
#include "script/script.h"
#include "script/sign.h"
#include "streams.h"
// FIXME: Dedup with BuildCreditingTransaction in test/script_tests.cpp.
static CMutableTransaction BuildCreditingTransaction(const CScript& scriptPubKey)
{
CMutableTransaction txCredit;
txCredit.nVersion = 1;
txCredit.nLockTime = 0;
txCredit.vin.resize(1);
txCredit.vout.resize(1);
txCredit.vin[0].prevout.SetNull();
txCredit.vin[0].scriptSig = CScript() << CScriptNum(0) << CScriptNum(0);
txCredit.vin[0].nSequence = CTxIn::SEQUENCE_FINAL;
txCredit.vout[0].scriptPubKey = scriptPubKey;
txCredit.vout[0].nValue = 1;
return txCredit;
}
// FIXME: Dedup with BuildSpendingTransaction in test/script_tests.cpp.
static CMutableTransaction BuildSpendingTransaction(const CScript& scriptSig, const CMutableTransaction& txCredit)
{
CMutableTransaction txSpend;
txSpend.nVersion = 1;
txSpend.nLockTime = 0;
txSpend.vin.resize(1);
txSpend.vout.resize(1);
txSpend.vin[0].prevout.hash = txCredit.GetHash();
txSpend.vin[0].prevout.n = 0;
txSpend.vin[0].scriptSig = scriptSig;
txSpend.vin[0].nSequence = CTxIn::SEQUENCE_FINAL;
txSpend.vout[0].scriptPubKey = CScript();
txSpend.vout[0].nValue = txCredit.vout[0].nValue;
return txSpend;
}
// Microbenchmark for verification of a basic P2WPKH script. Can be easily
// modified to measure performance of other types of scripts.
static void VerifyScriptBench(benchmark::State& state)
{
const int flags = SCRIPT_VERIFY_WITNESS | SCRIPT_VERIFY_P2SH;
const int witnessversion = 0;
// Keypair.
CKey key;
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};
key.Set(vchKey, vchKey + 32, false);
CPubKey pubkey = key.GetPubKey();
uint160 pubkeyHash;
CHash160().Write(pubkey.begin(), pubkey.size()).Finalize(pubkeyHash.begin());
// Script.
CScript scriptPubKey = CScript() << witnessversion << ToByteVector(pubkeyHash);
CScript scriptSig;
CScript witScriptPubkey = CScript() << OP_DUP << OP_HASH160 << ToByteVector(pubkeyHash) << OP_EQUALVERIFY << OP_CHECKSIG;
CTransaction txCredit = BuildCreditingTransaction(scriptPubKey);
CMutableTransaction txSpend = BuildSpendingTransaction(scriptSig, txCredit);
CScriptWitness& witness = txSpend.vin[0].scriptWitness;
witness.stack.emplace_back();
key.Sign(SignatureHash(witScriptPubkey, txSpend, 0, SIGHASH_ALL, txCredit.vout[0].nValue, SIGVERSION_WITNESS_V0), witness.stack.back(), 0);
witness.stack.back().push_back(static_cast<unsigned char>(SIGHASH_ALL));
witness.stack.push_back(ToByteVector(pubkey));
// Benchmark.
while (state.KeepRunning()) {
ScriptError err;
bool success = VerifyScript(
txSpend.vin[0].scriptSig,
txCredit.vout[0].scriptPubKey,
&txSpend.vin[0].scriptWitness,
flags,
MutableTransactionSignatureChecker(&txSpend, 0, txCredit.vout[0].nValue),
&err);
assert(err == SCRIPT_ERR_OK);
assert(success);
#if defined(HAVE_CONSENSUS_LIB)
CDataStream stream(SER_NETWORK, PROTOCOL_VERSION);
stream << txSpend;
int csuccess = bitcoinconsensus_verify_script_with_amount(
txCredit.vout[0].scriptPubKey.data(),
txCredit.vout[0].scriptPubKey.size(),
txCredit.vout[0].nValue,
(const unsigned char*)stream.data(), stream.size(), 0, flags, nullptr);
assert(csuccess == 1);
#endif
}
}
BENCHMARK(VerifyScriptBench);
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