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// Copyright (c) 2011-2022 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 <key.h>
#include <policy/policy.h>
#include <script/interpreter.h>
#include <script/script.h>
#include <script/script_error.h>
#include <script/sign.h>
#include <script/signingprovider.h>
#include <test/util/setup_common.h>
#include <test/util/transaction_utils.h>
#include <tinyformat.h>
#include <uint256.h>
#include <boost/test/unit_test.hpp>
BOOST_FIXTURE_TEST_SUITE(multisig_tests, BasicTestingSetup)
static CScript
sign_multisig(const CScript& scriptPubKey, const std::vector<CKey>& keys, const CTransaction& transaction, int whichIn)
{
uint256 hash = SignatureHash(scriptPubKey, transaction, whichIn, SIGHASH_ALL, 0, SigVersion::BASE);
CScript result;
result << OP_0; // CHECKMULTISIG bug workaround
for (const CKey &key : keys)
{
std::vector<unsigned char> vchSig;
BOOST_CHECK(key.Sign(hash, vchSig));
vchSig.push_back((unsigned char)SIGHASH_ALL);
result << vchSig;
}
return result;
}
BOOST_AUTO_TEST_CASE(multisig_verify)
{
unsigned int flags = SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_STRICTENC;
ScriptError err;
CKey key[4];
CAmount amount = 0;
for (int i = 0; i < 4; i++)
key[i].MakeNewKey(true);
CScript a_and_b;
a_and_b << OP_2 << ToByteVector(key[0].GetPubKey()) << ToByteVector(key[1].GetPubKey()) << OP_2 << OP_CHECKMULTISIG;
CScript a_or_b;
a_or_b << OP_1 << ToByteVector(key[0].GetPubKey()) << ToByteVector(key[1].GetPubKey()) << OP_2 << OP_CHECKMULTISIG;
CScript escrow;
escrow << OP_2 << ToByteVector(key[0].GetPubKey()) << ToByteVector(key[1].GetPubKey()) << ToByteVector(key[2].GetPubKey()) << OP_3 << OP_CHECKMULTISIG;
CMutableTransaction txFrom; // Funding transaction
txFrom.vout.resize(3);
txFrom.vout[0].scriptPubKey = a_and_b;
txFrom.vout[1].scriptPubKey = a_or_b;
txFrom.vout[2].scriptPubKey = escrow;
CMutableTransaction txTo[3]; // Spending transaction
for (int i = 0; i < 3; i++)
{
txTo[i].vin.resize(1);
txTo[i].vout.resize(1);
txTo[i].vin[0].prevout.n = i;
txTo[i].vin[0].prevout.hash = txFrom.GetHash();
txTo[i].vout[0].nValue = 1;
}
std::vector<CKey> keys;
CScript s;
// Test a AND b:
keys.assign(1,key[0]);
keys.push_back(key[1]);
s = sign_multisig(a_and_b, keys, CTransaction(txTo[0]), 0);
BOOST_CHECK(VerifyScript(s, a_and_b, nullptr, flags, MutableTransactionSignatureChecker(&txTo[0], 0, amount, MissingDataBehavior::ASSERT_FAIL), &err));
BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_OK, ScriptErrorString(err));
for (int i = 0; i < 4; i++)
{
keys.assign(1,key[i]);
s = sign_multisig(a_and_b, keys, CTransaction(txTo[0]), 0);
BOOST_CHECK_MESSAGE(!VerifyScript(s, a_and_b, nullptr, flags, MutableTransactionSignatureChecker(&txTo[0], 0, amount, MissingDataBehavior::ASSERT_FAIL), &err), strprintf("a&b 1: %d", i));
BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_INVALID_STACK_OPERATION, ScriptErrorString(err));
keys.assign(1,key[1]);
keys.push_back(key[i]);
s = sign_multisig(a_and_b, keys, CTransaction(txTo[0]), 0);
BOOST_CHECK_MESSAGE(!VerifyScript(s, a_and_b, nullptr, flags, MutableTransactionSignatureChecker(&txTo[0], 0, amount, MissingDataBehavior::ASSERT_FAIL), &err), strprintf("a&b 2: %d", i));
BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_EVAL_FALSE, ScriptErrorString(err));
}
// Test a OR b:
for (int i = 0; i < 4; i++)
{
keys.assign(1,key[i]);
s = sign_multisig(a_or_b, keys, CTransaction(txTo[1]), 0);
if (i == 0 || i == 1)
{
BOOST_CHECK_MESSAGE(VerifyScript(s, a_or_b, nullptr, flags, MutableTransactionSignatureChecker(&txTo[1], 0, amount, MissingDataBehavior::ASSERT_FAIL), &err), strprintf("a|b: %d", i));
BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_OK, ScriptErrorString(err));
}
else
{
BOOST_CHECK_MESSAGE(!VerifyScript(s, a_or_b, nullptr, flags, MutableTransactionSignatureChecker(&txTo[1], 0, amount, MissingDataBehavior::ASSERT_FAIL), &err), strprintf("a|b: %d", i));
BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_EVAL_FALSE, ScriptErrorString(err));
}
}
s.clear();
s << OP_0 << OP_1;
BOOST_CHECK(!VerifyScript(s, a_or_b, nullptr, flags, MutableTransactionSignatureChecker(&txTo[1], 0, amount, MissingDataBehavior::ASSERT_FAIL), &err));
BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_SIG_DER, ScriptErrorString(err));
for (int i = 0; i < 4; i++)
for (int j = 0; j < 4; j++)
{
keys.assign(1,key[i]);
keys.push_back(key[j]);
s = sign_multisig(escrow, keys, CTransaction(txTo[2]), 0);
if (i < j && i < 3 && j < 3)
{
BOOST_CHECK_MESSAGE(VerifyScript(s, escrow, nullptr, flags, MutableTransactionSignatureChecker(&txTo[2], 0, amount, MissingDataBehavior::ASSERT_FAIL), &err), strprintf("escrow 1: %d %d", i, j));
BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_OK, ScriptErrorString(err));
}
else
{
BOOST_CHECK_MESSAGE(!VerifyScript(s, escrow, nullptr, flags, MutableTransactionSignatureChecker(&txTo[2], 0, amount, MissingDataBehavior::ASSERT_FAIL), &err), strprintf("escrow 2: %d %d", i, j));
BOOST_CHECK_MESSAGE(err == SCRIPT_ERR_EVAL_FALSE, ScriptErrorString(err));
}
}
}
BOOST_AUTO_TEST_CASE(multisig_IsStandard)
{
CKey key[4];
for (int i = 0; i < 4; i++)
key[i].MakeNewKey(true);
const auto is_standard{[](const CScript& spk) {
TxoutType type;
bool res{::IsStandard(spk, std::nullopt, type)};
if (res) {
BOOST_CHECK_EQUAL(type, TxoutType::MULTISIG);
}
return res;
}};
CScript a_and_b;
a_and_b << OP_2 << ToByteVector(key[0].GetPubKey()) << ToByteVector(key[1].GetPubKey()) << OP_2 << OP_CHECKMULTISIG;
BOOST_CHECK(is_standard(a_and_b));
CScript a_or_b;
a_or_b << OP_1 << ToByteVector(key[0].GetPubKey()) << ToByteVector(key[1].GetPubKey()) << OP_2 << OP_CHECKMULTISIG;
BOOST_CHECK(is_standard(a_or_b));
CScript escrow;
escrow << OP_2 << ToByteVector(key[0].GetPubKey()) << ToByteVector(key[1].GetPubKey()) << ToByteVector(key[2].GetPubKey()) << OP_3 << OP_CHECKMULTISIG;
BOOST_CHECK(is_standard(escrow));
CScript one_of_four;
one_of_four << OP_1 << ToByteVector(key[0].GetPubKey()) << ToByteVector(key[1].GetPubKey()) << ToByteVector(key[2].GetPubKey()) << ToByteVector(key[3].GetPubKey()) << OP_4 << OP_CHECKMULTISIG;
BOOST_CHECK(!is_standard(one_of_four));
CScript malformed[6];
malformed[0] << OP_3 << ToByteVector(key[0].GetPubKey()) << ToByteVector(key[1].GetPubKey()) << OP_2 << OP_CHECKMULTISIG;
malformed[1] << OP_2 << ToByteVector(key[0].GetPubKey()) << ToByteVector(key[1].GetPubKey()) << OP_3 << OP_CHECKMULTISIG;
malformed[2] << OP_0 << ToByteVector(key[0].GetPubKey()) << ToByteVector(key[1].GetPubKey()) << OP_2 << OP_CHECKMULTISIG;
malformed[3] << OP_1 << ToByteVector(key[0].GetPubKey()) << ToByteVector(key[1].GetPubKey()) << OP_0 << OP_CHECKMULTISIG;
malformed[4] << OP_1 << ToByteVector(key[0].GetPubKey()) << ToByteVector(key[1].GetPubKey()) << OP_CHECKMULTISIG;
malformed[5] << OP_1 << ToByteVector(key[0].GetPubKey()) << ToByteVector(key[1].GetPubKey());
for (int i = 0; i < 6; i++) {
BOOST_CHECK(!is_standard(malformed[i]));
}
}
BOOST_AUTO_TEST_CASE(multisig_Sign)
{
// Test SignSignature() (and therefore the version of Solver() that signs transactions)
FillableSigningProvider keystore;
CKey key[4];
for (int i = 0; i < 4; i++)
{
key[i].MakeNewKey(true);
BOOST_CHECK(keystore.AddKey(key[i]));
}
CScript a_and_b;
a_and_b << OP_2 << ToByteVector(key[0].GetPubKey()) << ToByteVector(key[1].GetPubKey()) << OP_2 << OP_CHECKMULTISIG;
CScript a_or_b;
a_or_b << OP_1 << ToByteVector(key[0].GetPubKey()) << ToByteVector(key[1].GetPubKey()) << OP_2 << OP_CHECKMULTISIG;
CScript escrow;
escrow << OP_2 << ToByteVector(key[0].GetPubKey()) << ToByteVector(key[1].GetPubKey()) << ToByteVector(key[2].GetPubKey()) << OP_3 << OP_CHECKMULTISIG;
CMutableTransaction txFrom; // Funding transaction
txFrom.vout.resize(3);
txFrom.vout[0].scriptPubKey = a_and_b;
txFrom.vout[1].scriptPubKey = a_or_b;
txFrom.vout[2].scriptPubKey = escrow;
CMutableTransaction txTo[3]; // Spending transaction
for (int i = 0; i < 3; i++)
{
txTo[i].vin.resize(1);
txTo[i].vout.resize(1);
txTo[i].vin[0].prevout.n = i;
txTo[i].vin[0].prevout.hash = txFrom.GetHash();
txTo[i].vout[0].nValue = 1;
}
for (int i = 0; i < 3; i++)
{
SignatureData empty;
BOOST_CHECK_MESSAGE(SignSignature(keystore, CTransaction(txFrom), txTo[i], 0, SIGHASH_ALL, empty), strprintf("SignSignature %d", i));
}
}
BOOST_AUTO_TEST_SUITE_END()
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