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blind_tests.cpp
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// Copyright (c) 2011-2014 The Bitcoin Core developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include "arith_uint256.h"
#include "blind.h"
#include "coins.h"
#include "uint256.h"
#include "wallet/wallet.h"
#include "main.h"
#include "test/test_bitcoin.h"
#include <boost/test/unit_test.hpp>
BOOST_FIXTURE_TEST_SUITE(blind_tests, TestingSetup)
#ifdef ENABLE_WALLET
static CWallet wallet;
#endif
BOOST_AUTO_TEST_CASE(naive_blinding_test)
{
CCoinsView viewBase;
CCoinsViewCache cache(&viewBase);
CKey key1;
CKey key2;
CKey keyDummy;
// Any asset id will do
CAsset bitcoinID(GetRandHash());
CAsset otherID(GetRandHash());
CAsset unblinded_id;
uint256 asset_blind;
CScript scriptCommit(OP_TRUE);
std::vector<CKey> vDummy;
unsigned char k1[32] = {1,2,3};
unsigned char k2[32] = {22,33,44};
unsigned char kDummy[32] = {133,144,155};
key1.Set(&k1[0], &k1[32], true);
key2.Set(&k2[0], &k2[32], true);
keyDummy.Set(&kDummy[0], &kDummy[32], true);
CPubKey pubkey1 = key1.GetPubKey();
CPubKey pubkey2 = key2.GetPubKey();
CPubKey pubkeyDummy = keyDummy.GetPubKey();
uint256 blind3, blind4, blindDummy;
{
CCoinsModifier tx1 = cache.ModifyCoins(ArithToUint256(1));
tx1->vout.resize(1);
tx1->vout[0].nValue = 11;
tx1->vout[0].nAsset = bitcoinID;
}
{
CCoinsModifier tx2 = cache.ModifyCoins(ArithToUint256(2));
tx2->vout.resize(2);
tx2->vout[0].nValue = 111;
tx2->vout[0].nAsset = bitcoinID;
}
{
CCoinsModifier tx2_2 = cache.ModifyCoins(ArithToUint256(5));
tx2_2->vout.resize(1);
tx2_2->vout[0].nValue = 500;
tx2_2->vout[0].nAsset = otherID;
}
{
// Build a transaction that spends 2 unblinded coins (11, 111), and produces a single blinded one (100) and fee (22).
CMutableTransaction tx3;
tx3.vin.resize(2);
tx3.vin[0].prevout.hash = ArithToUint256(1);
tx3.vin[0].prevout.n = 0;
tx3.vin[1].prevout.hash = ArithToUint256(2);
tx3.vin[1].prevout.n = 0;
tx3.vout.resize(0);
tx3.vout.push_back(CTxOut(bitcoinID, 100, CScript() << OP_TRUE));
// Fee outputs are blank scriptpubkeys, and unblinded value/asset
tx3.vout.push_back(CTxOut(bitcoinID, 22, CScript()));
BOOST_CHECK(VerifyAmounts(cache, tx3));
// Fees must have non-negative value
tx3.vout.push_back(CTxOut(bitcoinID, 0, CScript()));
BOOST_CHECK(VerifyAmounts(cache, tx3));
tx3.vout.push_back(CTxOut(bitcoinID, -1, CScript()));
BOOST_CHECK(!VerifyAmounts(cache, tx3));
tx3.vout.pop_back();
tx3.vout.pop_back();
BOOST_CHECK(VerifyAmounts(cache, tx3));
// Try to blind with a single non-fee output, which fails as its blinding factor ends up being zero.
std::vector<uint256> input_blinds;
std::vector<uint256> input_asset_blinds;
std::vector<CAsset> input_assets;
std::vector<CAmount> input_amounts;
std::vector<uint256> output_blinds;
std::vector<uint256> output_asset_blinds;
std::vector<CPubKey> output_pubkeys;
input_blinds.push_back(uint256());
input_blinds.push_back(uint256());
input_asset_blinds.push_back(uint256());
input_asset_blinds.push_back(uint256());
input_assets.push_back(bitcoinID);
input_assets.push_back(bitcoinID);
input_amounts.push_back(11);
input_amounts.push_back(111);
output_pubkeys.push_back(pubkey1);
output_pubkeys.push_back(CPubKey());
BOOST_CHECK(BlindTransaction(input_blinds, input_asset_blinds, input_assets, input_amounts, output_blinds, output_asset_blinds, output_pubkeys, vDummy, vDummy, tx3) == 0);
// Add a dummy output. Must be unspendable since it's 0-valued.
tx3.vout.push_back(CTxOut(bitcoinID, 0, CScript() << OP_RETURN));
output_pubkeys.push_back(pubkeyDummy);
BOOST_CHECK(BlindTransaction(input_blinds, input_asset_blinds, input_assets, input_amounts, output_blinds, output_asset_blinds, output_pubkeys, vDummy, vDummy, tx3) == 2);
BOOST_CHECK(!tx3.vout[0].nValue.IsExplicit());
BOOST_CHECK(!tx3.vout[2].nValue.IsExplicit());
BOOST_CHECK(VerifyAmounts(cache, tx3));
CAmount unblinded_amount;
BOOST_CHECK(UnblindConfidentialPair(key2, tx3.vout[0].nValue, tx3.vout[0].nAsset, tx3.vout[0].nNonce, scriptCommit, tx3.wit.vtxoutwit[0].vchRangeproof, unblinded_amount, blind3, unblinded_id, asset_blind) == 0);
// Saving unblinded_id and asset_blind for later since we need for input
BOOST_CHECK(UnblindConfidentialPair(key1, tx3.vout[0].nValue, tx3.vout[0].nAsset, tx3.vout[0].nNonce, scriptCommit, tx3.wit.vtxoutwit[0].vchRangeproof, unblinded_amount, blind3, unblinded_id, asset_blind) == 1);
BOOST_CHECK(unblinded_amount == 100);
BOOST_CHECK(unblinded_id == bitcoinID);
CAsset temp_asset;
uint256 temp_asset_blinder;
BOOST_CHECK(UnblindConfidentialPair(keyDummy, tx3.vout[2].nValue, tx3.vout[2].nAsset, tx3.vout[2].nNonce, CScript() << OP_RETURN, tx3.wit.vtxoutwit[2].vchRangeproof, unblinded_amount, blindDummy, temp_asset, temp_asset_blinder) == 1);
BOOST_CHECK(unblinded_amount == 0);
CCoinsModifier in3 = cache.ModifyCoins(ArithToUint256(3));
in3->vout.resize(3);
in3->vout[0] = tx3.vout[0];
in3->vout[1] = tx3.vout[1];
in3->vout[2] = tx3.vout[2];
tx3.vout[1].nValue = CConfidentialValue(tx3.vout[1].nValue.GetAmount() - 1);
BOOST_CHECK(!VerifyAmounts(cache, tx3));
}
{
// Build a transactions that spends an unblinded (111) and blinded (100) coin, and produces only unblinded coins (impossible)
CMutableTransaction tx4;
tx4.vin.resize(2);
tx4.vin[0].prevout.hash = ArithToUint256(2);
tx4.vin[0].prevout.n = 0;
tx4.vin[1].prevout.hash = ArithToUint256(3);
tx4.vin[1].prevout.n = 0;
tx4.vout.push_back(CTxOut(bitcoinID, 30, CScript() << OP_TRUE));
tx4.vout.push_back(CTxOut(bitcoinID, 40, CScript() << OP_TRUE));
tx4.vout.push_back(CTxOut(bitcoinID, 111+100-30-40, CScript()));
BOOST_CHECK(!VerifyAmounts(cache, tx4)); // Spends a blinded coin with no blinded outputs to compensate.
std::vector<uint256> input_blinds;
std::vector<uint256> input_asset_blinds;
std::vector<CAsset> input_assets;
std::vector<CAmount> input_amounts;
std::vector<uint256> output_blinds;
std::vector<uint256> output_asset_blinds;
std::vector<CPubKey> output_pubkeys;
input_blinds.push_back(uint256());
input_blinds.push_back(blind3);
input_asset_blinds.push_back(uint256());
input_asset_blinds.push_back(asset_blind);
input_amounts.push_back(111);
input_amounts.push_back(100);
input_assets.push_back(unblinded_id);
input_assets.push_back(unblinded_id);
output_pubkeys.push_back(CPubKey());
output_pubkeys.push_back(CPubKey());
output_pubkeys.push_back(CPubKey());
BOOST_CHECK(BlindTransaction(input_blinds, input_asset_blinds, input_assets, input_amounts, output_blinds, output_asset_blinds, output_pubkeys, vDummy, vDummy, tx4) == 0); // Blinds nothing
}
{
// Build a transactions that spends an unblinded (111) and blinded (100) coin, and produces a blinded (30), unblinded (40), and blinded (50) coin and fee (91)
CMutableTransaction tx4;
tx4.vin.resize(2);
tx4.vin[0].prevout.hash = ArithToUint256(2);
tx4.vin[0].prevout.n = 0;
tx4.vin[1].prevout.hash = ArithToUint256(3);
tx4.vin[1].prevout.n = 0;
tx4.vout.push_back(CTxOut(bitcoinID, 30, CScript() << OP_TRUE));
tx4.vout.push_back(CTxOut(bitcoinID, 40, CScript() << OP_TRUE));
tx4.vout.push_back(CTxOut(bitcoinID, 50, CScript() << OP_TRUE));
// Fee
tx4.vout.push_back(CTxOut(bitcoinID, 111+100-30-40-50, CScript()));
BOOST_CHECK(!VerifyAmounts(cache, tx4)); // Spends a blinded coin with no blinded outputs to compensate.
std::vector<uint256> input_blinds;
std::vector<uint256> input_asset_blinds;
std::vector<CAsset> input_assets;
std::vector<CAmount> input_amounts;
std::vector<uint256> output_blinds;
std::vector<uint256> output_asset_blinds;
std::vector<CPubKey> output_pubkeys;
input_blinds.push_back(uint256());
input_blinds.push_back(blind3);
input_asset_blinds.push_back(uint256());
input_asset_blinds.push_back(asset_blind);
input_amounts.push_back(111);
input_amounts.push_back(100);
input_assets.push_back(unblinded_id);
input_assets.push_back(unblinded_id);
output_pubkeys.push_back(pubkey2);
output_pubkeys.push_back(CPubKey());
output_pubkeys.push_back(pubkey2);
output_pubkeys.push_back(CPubKey());
BOOST_CHECK(BlindTransaction(input_blinds, input_asset_blinds, input_assets, input_amounts, output_blinds, output_asset_blinds, output_pubkeys, vDummy, vDummy, tx4) == 2);
BOOST_CHECK(!tx4.vout[0].nValue.IsExplicit());
BOOST_CHECK(tx4.vout[1].nValue.IsExplicit());
BOOST_CHECK(!tx4.vout[2].nValue.IsExplicit());
BOOST_CHECK(VerifyAmounts(cache, tx4));
#ifdef ENABLE_WALLET
//This tests the wallet blinding caching functionality
CWalletTx wtx(&wallet, tx4);
uint256 factor = wtx.GetOutputBlindingFactor(0);
uint256 asset_factor = wtx.GetOutputAssetBlindingFactor(0);
CAsset asset = wtx.GetOutputAsset(0);
CPubKey pubkey = wtx.GetOutputBlindingPubKey(0);
CAmount amount = wtx.GetOutputValueOut(0);
BOOST_CHECK(factor == uint256());
BOOST_CHECK(asset_factor == uint256());
BOOST_CHECK(asset.IsNull());
BOOST_CHECK(pubkey == CPubKey());
BOOST_CHECK(amount == -1);
wtx.SetBlindingData(0, 42, output_pubkeys[0], output_blinds[0], unblinded_id, output_asset_blinds[0]);
factor = wtx.GetOutputBlindingFactor(0);
asset_factor = wtx.GetOutputAssetBlindingFactor(0);
asset = wtx.GetOutputAsset(0);
pubkey = wtx.GetOutputBlindingPubKey(0);
amount = wtx.GetOutputValueOut(0);
BOOST_CHECK(factor == output_blinds[0]);
BOOST_CHECK(asset_factor == output_asset_blinds[0]);
BOOST_CHECK(asset == unblinded_id);
BOOST_CHECK(pubkey == output_pubkeys[0]);
BOOST_CHECK(amount == 42);
wtx.SetBlindingData(1, 11, output_pubkeys[1], output_blinds[1], otherID, output_asset_blinds[1]);
factor = wtx.GetOutputBlindingFactor(0);
asset_factor = wtx.GetOutputAssetBlindingFactor(0);
asset = wtx.GetOutputAsset(0);
pubkey = wtx.GetOutputBlindingPubKey(0);
amount = wtx.GetOutputValueOut(0);
BOOST_CHECK(factor == output_blinds[0]);
BOOST_CHECK(pubkey == output_pubkeys[0]);
BOOST_CHECK(amount == 42);
factor = wtx.GetOutputBlindingFactor(1);
asset_factor = wtx.GetOutputAssetBlindingFactor(1);
asset = wtx.GetOutputAsset(1);
pubkey = wtx.GetOutputBlindingPubKey(1);
amount = wtx.GetOutputValueOut(1);
BOOST_CHECK(factor == output_blinds[1]);
BOOST_CHECK(asset_factor == output_asset_blinds[1]);
BOOST_CHECK(asset == otherID);
BOOST_CHECK(pubkey == output_pubkeys[1]);
BOOST_CHECK(amount == 11);
#endif
CAmount unblinded_amount;
CAsset asset_out;
uint256 asset_blinder_out;
BOOST_CHECK(UnblindConfidentialPair(key1, tx4.vout[0].nValue, tx4.vout[0].nAsset, tx4.vout[0].nNonce, scriptCommit, tx4.wit.vtxoutwit[0].vchRangeproof, unblinded_amount, blind4, asset_out, asset_blinder_out) == 0);
BOOST_CHECK(UnblindConfidentialPair(key2, tx4.vout[0].nValue, tx4.vout[0].nAsset, tx4.vout[0].nNonce, scriptCommit, tx4.wit.vtxoutwit[0].vchRangeproof, unblinded_amount, blind4, asset_out, asset_blinder_out) == 1);
BOOST_CHECK(unblinded_amount == 30);
BOOST_CHECK(asset_out == unblinded_id);
BOOST_CHECK(UnblindConfidentialPair(key2, tx4.vout[2].nValue, tx4.vout[2].nAsset, tx4.vout[2].nNonce, scriptCommit, tx4.wit.vtxoutwit[2].vchRangeproof, unblinded_amount, blind4, asset_out, asset_blinder_out) == 1);
BOOST_CHECK(asset_out == unblinded_id);
BOOST_CHECK(unblinded_amount == 50);
CCoinsModifier in4 = cache.ModifyCoins(ArithToUint256(4));
in4->vout.resize(4);
in4->vout[0] = tx4.vout[0];
in4->vout[1] = tx4.vout[1];
in4->vout[2] = tx4.vout[2];
in4->vout[3] = tx4.vout[3];
tx4.vout[3].nValue = CConfidentialValue(tx4.vout[3].nValue.GetAmount() - 1);
BOOST_CHECK(!VerifyAmounts(cache, tx4));
}
{
// Spends 100 blinded bitcoin, 500 of unblinded "other"
CMutableTransaction tx5;
tx5.vin.resize(0);
tx5.vout.resize(0);
tx5.vin.push_back(CTxIn(COutPoint(ArithToUint256(3), 0)));
tx5.vin.push_back(CTxIn(COutPoint(ArithToUint256(5), 0)));
tx5.vout.push_back(CTxOut(bitcoinID, 29, CScript() << OP_TRUE));
tx5.vout.push_back(CTxOut(bitcoinID, 70, CScript() << OP_TRUE));
tx5.vout.push_back(CTxOut(otherID, 250, CScript() << OP_TRUE));
tx5.vout.push_back(CTxOut(otherID, 249, CScript() << OP_TRUE));
// Fees
tx5.vout.push_back(CTxOut(bitcoinID, 1, CScript()));
tx5.vout.push_back(CTxOut(otherID, 1, CScript()));
// Blinds don't balance
BOOST_CHECK(!VerifyAmounts(cache, tx5));
// Blinding setup stuff
std::vector<uint256> input_blinds;
std::vector<uint256> input_asset_blinds;
std::vector<CAsset> input_assets;
std::vector<CAmount> input_amounts;
std::vector<uint256> output_blinds;
std::vector<uint256> output_asset_blinds;
std::vector<CPubKey> output_pubkeys;
input_blinds.push_back(blind3);
input_blinds.push_back(uint256()); //
input_asset_blinds.push_back(asset_blind);
input_asset_blinds.push_back(uint256());
input_amounts.push_back(100);
input_amounts.push_back(500);
input_assets.push_back(bitcoinID);
input_assets.push_back(otherID);
for (unsigned int i = 0; i < 6; i++) {
output_pubkeys.push_back(pubkey2);
}
CMutableTransaction txtemp(tx5);
// No blinding keys for fees, bails out blinding nothing, still valid due to imbalance
BOOST_CHECK(BlindTransaction(input_blinds, input_asset_blinds, input_assets, input_amounts, output_blinds, output_asset_blinds, output_pubkeys, vDummy, vDummy, txtemp) == -1);
BOOST_CHECK(!VerifyAmounts(cache, txtemp));
// Last will be implied blank keys
output_pubkeys.resize(4);
// Blind transaction, verify amounts
txtemp = tx5;
BOOST_CHECK(BlindTransaction(input_blinds, input_asset_blinds, input_assets, input_amounts, output_blinds, output_asset_blinds, output_pubkeys, vDummy, vDummy, txtemp) == 4);
BOOST_CHECK(VerifyAmounts(cache, txtemp));
// Transaction may not have spendable 0-value output
txtemp.vout.push_back(CTxOut(CAsset(), 0, CScript() << OP_TRUE));
BOOST_CHECK(!VerifyAmounts(cache, txtemp));
// Create imbalance by removing fees, should still be able to blind
txtemp = tx5;
txtemp.vout.resize(5);
BOOST_CHECK(!VerifyAmounts(cache, txtemp));
txtemp.vout.resize(4);
BOOST_CHECK(!VerifyAmounts(cache, txtemp));
BOOST_CHECK(BlindTransaction(input_blinds, input_asset_blinds, input_assets, input_amounts, output_blinds, output_asset_blinds, output_pubkeys, vDummy, vDummy, txtemp) == 4);
BOOST_CHECK(!VerifyAmounts(cache, txtemp));
txtemp = tx5;
// Remove other input, make surjection proof impossible for 2 "otherID" outputs
std::vector<uint256> t_input_blinds;
std::vector<uint256> t_input_asset_blinds;
std::vector<CAsset> t_input_assets;
std::vector<CAmount> t_input_amounts;
t_input_blinds = input_blinds;
t_input_asset_blinds = input_asset_blinds;
t_input_assets = input_assets;
t_input_amounts = input_amounts;
txtemp.vin.resize(1);
t_input_blinds.resize(1);
t_input_asset_blinds.resize(1);
t_input_assets.resize(1);
t_input_amounts.resize(1);
BOOST_CHECK(!VerifyAmounts(cache, txtemp));
BOOST_CHECK(BlindTransaction(t_input_blinds, t_input_asset_blinds, t_input_assets, t_input_amounts, output_blinds, output_asset_blinds, output_pubkeys, vDummy, vDummy, txtemp) == 2);
BOOST_CHECK(!VerifyAmounts(cache, txtemp));
}
}
BOOST_AUTO_TEST_SUITE_END()