245 lines
10 KiB
C++
245 lines
10 KiB
C++
// Copyright (c) 2012-2015 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include "validation.h"
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#include "pubkey.h"
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#include "key.h"
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#include "script/script.h"
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#include "script/standard.h"
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#include "uint256.h"
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#include "test/test_bitcoin.h"
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#include <vector>
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#include <boost/foreach.hpp>
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#include <boost/test/unit_test.hpp>
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using namespace std;
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// Helpers:
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static std::vector<unsigned char>
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Serialize(const CScript& s)
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{
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std::vector<unsigned char> sSerialized(s.begin(), s.end());
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return sSerialized;
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}
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BOOST_FIXTURE_TEST_SUITE(sigopcount_tests, BasicTestingSetup)
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BOOST_AUTO_TEST_CASE(GetSigOpCount)
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{
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// Test CScript::GetSigOpCount()
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CScript s1;
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BOOST_CHECK_EQUAL(s1.GetSigOpCount(false), 0U);
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BOOST_CHECK_EQUAL(s1.GetSigOpCount(true), 0U);
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uint160 dummy;
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s1 << OP_1 << ToByteVector(dummy) << ToByteVector(dummy) << OP_2 << OP_CHECKMULTISIG;
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BOOST_CHECK_EQUAL(s1.GetSigOpCount(true), 2U);
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s1 << OP_IF << OP_CHECKSIG << OP_ENDIF;
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BOOST_CHECK_EQUAL(s1.GetSigOpCount(true), 3U);
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BOOST_CHECK_EQUAL(s1.GetSigOpCount(false), 21U);
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CScript p2sh = GetScriptForDestination(CScriptID(s1));
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CScript scriptSig;
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scriptSig << OP_0 << Serialize(s1);
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BOOST_CHECK_EQUAL(p2sh.GetSigOpCount(scriptSig), 3U);
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std::vector<CPubKey> keys;
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for (int i = 0; i < 3; i++)
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{
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CKey k;
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k.MakeNewKey(true);
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keys.push_back(k.GetPubKey());
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}
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CScript s2 = GetScriptForMultisig(1, keys);
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BOOST_CHECK_EQUAL(s2.GetSigOpCount(true), 3U);
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BOOST_CHECK_EQUAL(s2.GetSigOpCount(false), 20U);
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p2sh = GetScriptForDestination(CScriptID(s2));
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BOOST_CHECK_EQUAL(p2sh.GetSigOpCount(true), 0U);
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BOOST_CHECK_EQUAL(p2sh.GetSigOpCount(false), 0U);
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CScript scriptSig2;
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scriptSig2 << OP_1 << ToByteVector(dummy) << ToByteVector(dummy) << Serialize(s2);
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BOOST_CHECK_EQUAL(p2sh.GetSigOpCount(scriptSig2), 3U);
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}
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/**
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* Verifies script execution of the zeroth scriptPubKey of tx output and
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* zeroth scriptSig and witness of tx input.
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*/
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ScriptError VerifyWithFlag(const CTransaction& output, const CMutableTransaction& input, int flags)
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{
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ScriptError error;
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CTransaction inputi(input);
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bool ret = VerifyScript(inputi.vin[0].scriptSig, output.vout[0].scriptPubKey, inputi.wit.vtxinwit.size() > 0 ? &inputi.wit.vtxinwit[0].scriptWitness : NULL, flags, TransactionSignatureChecker(&inputi, 0, output.vout[0].nValue), &error);
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BOOST_CHECK((ret == true) == (error == SCRIPT_ERR_OK));
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return error;
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}
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/**
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* Builds a creationTx from scriptPubKey and a spendingTx from scriptSig
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* and witness such that spendingTx spends output zero of creationTx.
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* Also inserts creationTx's output into the coins view.
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*/
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void BuildTxs(CMutableTransaction& spendingTx, CCoinsViewCache& coins, CMutableTransaction& creationTx, const CScript& scriptPubKey, const CScript& scriptSig, const CTxInWitness& witness)
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{
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creationTx.nVersion = 1;
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creationTx.vin.resize(1);
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creationTx.vin[0].prevout.SetNull();
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creationTx.vin[0].scriptSig = CScript();
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creationTx.wit.vtxinwit.resize(1);
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creationTx.vout.resize(1);
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creationTx.vout[0].nValue = 1;
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creationTx.vout[0].scriptPubKey = scriptPubKey;
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spendingTx.nVersion = 1;
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spendingTx.vin.resize(1);
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spendingTx.vin[0].prevout.hash = creationTx.GetHash();
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spendingTx.vin[0].prevout.n = 0;
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spendingTx.vin[0].scriptSig = scriptSig;
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spendingTx.wit.vtxinwit.resize(1);
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spendingTx.wit.vtxinwit[0] = witness;
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spendingTx.vout.resize(1);
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spendingTx.vout[0].nValue = 1;
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spendingTx.vout[0].scriptPubKey = CScript();
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coins.ModifyCoins(creationTx.GetHash())->FromTx(creationTx, 0);
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}
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BOOST_AUTO_TEST_CASE(GetTxSigOpCost)
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{
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// Transaction creates outputs
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CMutableTransaction creationTx;
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// Transaction that spends outputs and whose
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// sig op cost is going to be tested
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CMutableTransaction spendingTx;
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// Create utxo set
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CCoinsView coinsDummy;
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CCoinsViewCache coins(&coinsDummy);
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// Create key
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CKey key;
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key.MakeNewKey(true);
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CPubKey pubkey = key.GetPubKey();
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// Default flags
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int flags = SCRIPT_VERIFY_WITNESS | SCRIPT_VERIFY_P2SH;
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// Multisig script (legacy counting)
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{
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CScript scriptPubKey = CScript() << 1 << ToByteVector(pubkey) << ToByteVector(pubkey) << 2 << OP_CHECKMULTISIGVERIFY;
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// Do not use a valid signature to avoid using wallet operations.
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CScript scriptSig = CScript() << OP_0 << OP_0;
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BuildTxs(spendingTx, coins, creationTx, scriptPubKey, scriptSig, CTxInWitness());
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// Legacy counting only includes signature operations in scriptSigs and scriptPubKeys
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// of a transaction and does not take the actual executed sig operations into account.
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// spendingTx in itself does not contain a signature operation.
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assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags) == 0);
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// creationTx contains two signature operations in its scriptPubKey, but legacy counting
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// is not accurate.
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assert(GetTransactionSigOpCost(CTransaction(creationTx), coins, flags) == MAX_PUBKEYS_PER_MULTISIG * WITNESS_SCALE_FACTOR);
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// Sanity check: script verification fails because of an invalid signature.
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assert(VerifyWithFlag(creationTx, spendingTx, flags) == SCRIPT_ERR_CHECKMULTISIGVERIFY);
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}
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// Multisig nested in P2SH
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{
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CScript redeemScript = CScript() << 1 << ToByteVector(pubkey) << ToByteVector(pubkey) << 2 << OP_CHECKMULTISIGVERIFY;
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CScript scriptPubKey = GetScriptForDestination(CScriptID(redeemScript));
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CScript scriptSig = CScript() << OP_0 << OP_0 << ToByteVector(redeemScript);
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BuildTxs(spendingTx, coins, creationTx, scriptPubKey, scriptSig, CTxInWitness());
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assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags) == 2 * WITNESS_SCALE_FACTOR);
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assert(VerifyWithFlag(creationTx, spendingTx, flags) == SCRIPT_ERR_CHECKMULTISIGVERIFY);
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}
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// P2WPKH witness program
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{
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CScript p2pk = CScript() << ToByteVector(pubkey) << OP_CHECKSIG;
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CScript scriptPubKey = GetScriptForWitness(p2pk);
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CScript scriptSig = CScript();
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CTxInWitness witness;
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CScriptWitness scriptWitness;
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scriptWitness.stack.push_back(vector<unsigned char>(0));
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scriptWitness.stack.push_back(vector<unsigned char>(0));
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witness.scriptWitness = scriptWitness;
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BuildTxs(spendingTx, coins, creationTx, scriptPubKey, scriptSig, witness);
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assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags) == 1);
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// No signature operations if we don't verify the witness.
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assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags & ~SCRIPT_VERIFY_WITNESS) == 0);
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assert(VerifyWithFlag(creationTx, spendingTx, flags) == SCRIPT_ERR_EQUALVERIFY);
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// The sig op cost for witness version != 0 is zero.
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assert(scriptPubKey[0] == 0x00);
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scriptPubKey[0] = 0x51;
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BuildTxs(spendingTx, coins, creationTx, scriptPubKey, scriptSig, witness);
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assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags) == 0);
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scriptPubKey[0] = 0x00;
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BuildTxs(spendingTx, coins, creationTx, scriptPubKey, scriptSig, witness);
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// The witness of a coinbase transaction is not taken into account.
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spendingTx.vin[0].prevout.SetNull();
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assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags) == 0);
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}
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// P2WPKH nested in P2SH
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{
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CScript p2pk = CScript() << ToByteVector(pubkey) << OP_CHECKSIG;
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CScript scriptSig = GetScriptForWitness(p2pk);
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CScript scriptPubKey = GetScriptForDestination(CScriptID(scriptSig));
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scriptSig = CScript() << ToByteVector(scriptSig);
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CTxInWitness witness;
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CScriptWitness scriptWitness;
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scriptWitness.stack.push_back(vector<unsigned char>(0));
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scriptWitness.stack.push_back(vector<unsigned char>(0));
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witness.scriptWitness = scriptWitness;
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BuildTxs(spendingTx, coins, creationTx, scriptPubKey, scriptSig, witness);
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assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags) == 1);
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assert(VerifyWithFlag(creationTx, spendingTx, flags) == SCRIPT_ERR_EQUALVERIFY);
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}
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// P2WSH witness program
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{
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CScript witnessScript = CScript() << 1 << ToByteVector(pubkey) << ToByteVector(pubkey) << 2 << OP_CHECKMULTISIGVERIFY;
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CScript scriptPubKey = GetScriptForWitness(witnessScript);
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CScript scriptSig = CScript();
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CTxInWitness witness;
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CScriptWitness scriptWitness;
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scriptWitness.stack.push_back(vector<unsigned char>(0));
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scriptWitness.stack.push_back(vector<unsigned char>(0));
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scriptWitness.stack.push_back(vector<unsigned char>(witnessScript.begin(), witnessScript.end()));
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witness.scriptWitness = scriptWitness;
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BuildTxs(spendingTx, coins, creationTx, scriptPubKey, scriptSig, witness);
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assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags) == 2);
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assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags & ~SCRIPT_VERIFY_WITNESS) == 0);
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assert(VerifyWithFlag(creationTx, spendingTx, flags) == SCRIPT_ERR_CHECKMULTISIGVERIFY);
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}
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// P2WSH nested in P2SH
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{
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CScript witnessScript = CScript() << 1 << ToByteVector(pubkey) << ToByteVector(pubkey) << 2 << OP_CHECKMULTISIGVERIFY;
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CScript redeemScript = GetScriptForWitness(witnessScript);
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CScript scriptPubKey = GetScriptForDestination(CScriptID(redeemScript));
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CScript scriptSig = CScript() << ToByteVector(redeemScript);
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CTxInWitness witness;
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CScriptWitness scriptWitness;
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scriptWitness.stack.push_back(vector<unsigned char>(0));
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scriptWitness.stack.push_back(vector<unsigned char>(0));
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scriptWitness.stack.push_back(vector<unsigned char>(witnessScript.begin(), witnessScript.end()));
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witness.scriptWitness = scriptWitness;
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BuildTxs(spendingTx, coins, creationTx, scriptPubKey, scriptSig, witness);
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assert(GetTransactionSigOpCost(CTransaction(spendingTx), coins, flags) == 2);
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assert(VerifyWithFlag(creationTx, spendingTx, flags) == SCRIPT_ERR_CHECKMULTISIGVERIFY);
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}
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}
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BOOST_AUTO_TEST_SUITE_END()
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