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Transaction.cpp
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// Copyright (c) 2012-2017, The CryptoNote developers, The Bytecoin developers
//
// This file is part of Bytecoin.
//
// Bytecoin is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Bytecoin is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with Bytecoin. If not, see <http://www.gnu.org/licenses/>.
#include "ITransaction.h"
#include "TransactionApiExtra.h"
#include "TransactionUtils.h"
#include "Account.h"
#include "CryptoNoteCore/CryptoNoteTools.h"
#include "CryptoNoteConfig.h"
#include <boost/optional.hpp>
#include <numeric>
#include <unordered_set>
using namespace Crypto;
namespace {
using namespace CryptoNote;
void derivePublicKey(const AccountPublicAddress& to, const SecretKey& txKey, size_t outputIndex, PublicKey& ephemeralKey) {
KeyDerivation derivation;
generate_key_derivation(to.viewPublicKey, txKey, derivation);
derive_public_key(derivation, outputIndex, to.spendPublicKey, ephemeralKey);
}
}
namespace CryptoNote {
using namespace Crypto;
////////////////////////////////////////////////////////////////////////
// class Transaction declaration
////////////////////////////////////////////////////////////////////////
class TransactionImpl : public ITransaction {
public:
TransactionImpl();
TransactionImpl(const BinaryArray& txblob);
TransactionImpl(const CryptoNote::Transaction& tx);
// ITransactionReader
virtual Hash getTransactionHash() const override;
virtual Hash getTransactionPrefixHash() const override;
virtual PublicKey getTransactionPublicKey() const override;
virtual uint64_t getUnlockTime() const override;
virtual bool getPaymentId(Hash& hash) const override;
virtual bool getExtraNonce(BinaryArray& nonce) const override;
virtual BinaryArray getExtra() const override;
// inputs
virtual size_t getInputCount() const override;
virtual uint64_t getInputTotalAmount() const override;
virtual TransactionTypes::InputType getInputType(size_t index) const override;
virtual void getInput(size_t index, KeyInput& input) const override;
// outputs
virtual size_t getOutputCount() const override;
virtual uint64_t getOutputTotalAmount() const override;
virtual TransactionTypes::OutputType getOutputType(size_t index) const override;
virtual void getOutput(size_t index, KeyOutput& output, uint64_t& amount) const override;
virtual size_t getRequiredSignaturesCount(size_t index) const override;
virtual bool findOutputsToAccount(const AccountPublicAddress& addr, const SecretKey& viewSecretKey, std::vector<uint32_t>& outs, uint64_t& outputAmount) const override;
// various checks
virtual bool validateInputs() const override;
virtual bool validateOutputs() const override;
virtual bool validateSignatures() const override;
// get serialized transaction
virtual BinaryArray getTransactionData() const override;
// ITransactionWriter
virtual void setUnlockTime(uint64_t unlockTime) override;
virtual void setPaymentId(const Hash& hash) override;
virtual void setExtraNonce(const BinaryArray& nonce) override;
virtual void appendExtra(const BinaryArray& extraData) override;
// Inputs/Outputs
virtual size_t addInput(const KeyInput& input) override;
virtual size_t addInput(const AccountKeys& senderKeys, const TransactionTypes::InputKeyInfo& info, KeyPair& ephKeys) override;
virtual size_t addOutput(uint64_t amount, const AccountPublicAddress& to) override;
virtual size_t addOutput(uint64_t amount, const KeyOutput& out) override;
virtual void signInputKey(size_t input, const TransactionTypes::InputKeyInfo& info, const KeyPair& ephKeys) override;
// secret key
virtual bool getTransactionSecretKey(SecretKey& key) const override;
virtual void setTransactionSecretKey(const SecretKey& key) override;
private:
void invalidateHash();
std::vector<Signature>& getSignatures(size_t input);
const SecretKey& txSecretKey() const {
if (!secretKey) {
throw std::runtime_error("Operation requires transaction secret key");
}
return *secretKey;
}
void checkIfSigning() const {
if (!transaction.signatures.empty()) {
throw std::runtime_error("Cannot perform requested operation, since it will invalidate transaction signatures");
}
}
CryptoNote::Transaction transaction;
boost::optional<SecretKey> secretKey;
mutable boost::optional<Hash> transactionHash;
TransactionExtra extra;
};
////////////////////////////////////////////////////////////////////////
// class Transaction implementation
////////////////////////////////////////////////////////////////////////
std::unique_ptr<ITransaction> createTransaction() {
return std::unique_ptr<ITransaction>(new TransactionImpl());
}
std::unique_ptr<ITransaction> createTransaction(const BinaryArray& transactionBlob) {
return std::unique_ptr<ITransaction>(new TransactionImpl(transactionBlob));
}
std::unique_ptr<ITransaction> createTransaction(const CryptoNote::Transaction& tx) {
return std::unique_ptr<ITransaction>(new TransactionImpl(tx));
}
TransactionImpl::TransactionImpl() {
CryptoNote::KeyPair txKeys(CryptoNote::generateKeyPair());
TransactionExtraPublicKey pk = { txKeys.publicKey };
extra.set(pk);
transaction.version = CURRENT_TRANSACTION_VERSION;
transaction.unlockTime = 0;
transaction.extra = extra.serialize();
secretKey = txKeys.secretKey;
}
TransactionImpl::TransactionImpl(const BinaryArray& ba) {
if (!fromBinaryArray(transaction, ba)) {
throw std::runtime_error("Invalid transaction data");
}
extra.parse(transaction.extra);
transactionHash = getBinaryArrayHash(ba); // avoid serialization if we already have blob
}
TransactionImpl::TransactionImpl(const CryptoNote::Transaction& tx) : transaction(tx) {
extra.parse(transaction.extra);
}
void TransactionImpl::invalidateHash() {
if (transactionHash.is_initialized()) {
transactionHash = decltype(transactionHash)();
}
}
Hash TransactionImpl::getTransactionHash() const {
if (!transactionHash.is_initialized()) {
transactionHash = getObjectHash(transaction);
}
return transactionHash.get();
}
Hash TransactionImpl::getTransactionPrefixHash() const {
return getObjectHash(*static_cast<const TransactionPrefix*>(&transaction));
}
PublicKey TransactionImpl::getTransactionPublicKey() const {
PublicKey pk(NULL_PUBLIC_KEY);
extra.getPublicKey(pk);
return pk;
}
uint64_t TransactionImpl::getUnlockTime() const {
return transaction.unlockTime;
}
void TransactionImpl::setUnlockTime(uint64_t unlockTime) {
checkIfSigning();
transaction.unlockTime = unlockTime;
invalidateHash();
}
bool TransactionImpl::getTransactionSecretKey(SecretKey& key) const {
if (!secretKey) {
return false;
}
key = reinterpret_cast<const SecretKey&>(secretKey.get());
return true;
}
void TransactionImpl::setTransactionSecretKey(const SecretKey& key) {
const auto& sk = reinterpret_cast<const SecretKey&>(key);
PublicKey pk;
PublicKey txPubKey;
secret_key_to_public_key(sk, pk);
extra.getPublicKey(txPubKey);
if (txPubKey != pk) {
throw std::runtime_error("Secret transaction key does not match public key");
}
secretKey = key;
}
size_t TransactionImpl::addInput(const KeyInput& input) {
checkIfSigning();
transaction.inputs.emplace_back(input);
invalidateHash();
return transaction.inputs.size() - 1;
}
size_t TransactionImpl::addInput(const AccountKeys& senderKeys, const TransactionTypes::InputKeyInfo& info, KeyPair& ephKeys) {
checkIfSigning();
KeyInput input;
input.amount = info.amount;
generate_key_image_helper(
senderKeys,
info.realOutput.transactionPublicKey,
info.realOutput.outputInTransaction,
ephKeys,
input.keyImage);
// fill outputs array and use relative offsets
for (const auto& out : info.outputs) {
input.outputIndexes.push_back(out.outputIndex);
}
input.outputIndexes = absolute_output_offsets_to_relative(input.outputIndexes);
return addInput(input);
}
size_t TransactionImpl::addOutput(uint64_t amount, const AccountPublicAddress& to) {
checkIfSigning();
KeyOutput outKey;
derivePublicKey(to, txSecretKey(), transaction.outputs.size(), outKey.key);
TransactionOutput out = { amount, outKey };
transaction.outputs.emplace_back(out);
invalidateHash();
return transaction.outputs.size() - 1;
}
size_t TransactionImpl::addOutput(uint64_t amount, const KeyOutput& out) {
checkIfSigning();
size_t outputIndex = transaction.outputs.size();
TransactionOutput realOut = { amount, out };
transaction.outputs.emplace_back(realOut);
invalidateHash();
return outputIndex;
}
void TransactionImpl::signInputKey(size_t index, const TransactionTypes::InputKeyInfo& info, const KeyPair& ephKeys) {
const auto& input = boost::get<KeyInput>(getInputChecked(transaction, index, TransactionTypes::InputType::Key));
Hash prefixHash = getTransactionPrefixHash();
std::vector<Signature> signatures;
std::vector<const PublicKey*> keysPtrs;
for (const auto& o : info.outputs) {
keysPtrs.push_back(reinterpret_cast<const PublicKey*>(&o.targetKey));
}
signatures.resize(keysPtrs.size());
generate_ring_signature(
reinterpret_cast<const Hash&>(prefixHash),
reinterpret_cast<const KeyImage&>(input.keyImage),
keysPtrs,
reinterpret_cast<const SecretKey&>(ephKeys.secretKey),
info.realOutput.transactionIndex,
signatures.data());
getSignatures(index) = signatures;
invalidateHash();
}
std::vector<Signature>& TransactionImpl::getSignatures(size_t input) {
// update signatures container size if needed
if (transaction.signatures.size() < transaction.inputs.size()) {
transaction.signatures.resize(transaction.inputs.size());
}
// check range
if (input >= transaction.signatures.size()) {
throw std::runtime_error("Invalid input index");
}
return transaction.signatures[input];
}
BinaryArray TransactionImpl::getTransactionData() const {
return toBinaryArray(transaction);
}
void TransactionImpl::setPaymentId(const Hash& hash) {
checkIfSigning();
BinaryArray paymentIdBlob;
setPaymentIdToTransactionExtraNonce(paymentIdBlob, reinterpret_cast<const Hash&>(hash));
setExtraNonce(paymentIdBlob);
}
bool TransactionImpl::getPaymentId(Hash& hash) const {
BinaryArray nonce;
if (getExtraNonce(nonce)) {
Hash paymentId;
if (getPaymentIdFromTransactionExtraNonce(nonce, paymentId)) {
hash = reinterpret_cast<const Hash&>(paymentId);
return true;
}
}
return false;
}
void TransactionImpl::setExtraNonce(const BinaryArray& nonce) {
checkIfSigning();
TransactionExtraNonce extraNonce = { nonce };
extra.set(extraNonce);
transaction.extra = extra.serialize();
invalidateHash();
}
void TransactionImpl::appendExtra(const BinaryArray& extraData) {
checkIfSigning();
transaction.extra.insert(
transaction.extra.end(), extraData.begin(), extraData.end());
}
bool TransactionImpl::getExtraNonce(BinaryArray& nonce) const {
TransactionExtraNonce extraNonce;
if (extra.get(extraNonce)) {
nonce = extraNonce.nonce;
return true;
}
return false;
}
BinaryArray TransactionImpl::getExtra() const {
return transaction.extra;
}
size_t TransactionImpl::getInputCount() const {
return transaction.inputs.size();
}
uint64_t TransactionImpl::getInputTotalAmount() const {
return std::accumulate(transaction.inputs.begin(), transaction.inputs.end(), 0ULL, [](uint64_t val, const TransactionInput& in) {
return val + getTransactionInputAmount(in); });
}
TransactionTypes::InputType TransactionImpl::getInputType(size_t index) const {
return getTransactionInputType(getInputChecked(transaction, index));
}
void TransactionImpl::getInput(size_t index, KeyInput& input) const {
input = boost::get<KeyInput>(getInputChecked(transaction, index, TransactionTypes::InputType::Key));
}
size_t TransactionImpl::getOutputCount() const {
return transaction.outputs.size();
}
uint64_t TransactionImpl::getOutputTotalAmount() const {
return std::accumulate(transaction.outputs.begin(), transaction.outputs.end(), 0ULL, [](uint64_t val, const TransactionOutput& out) {
return val + out.amount; });
}
TransactionTypes::OutputType TransactionImpl::getOutputType(size_t index) const {
return getTransactionOutputType(getOutputChecked(transaction, index).target);
}
void TransactionImpl::getOutput(size_t index, KeyOutput& output, uint64_t& amount) const {
const auto& out = getOutputChecked(transaction, index, TransactionTypes::OutputType::Key);
output = boost::get<KeyOutput>(out.target);
amount = out.amount;
}
bool TransactionImpl::findOutputsToAccount(const AccountPublicAddress& addr, const SecretKey& viewSecretKey, std::vector<uint32_t>& out, uint64_t& amount) const {
return ::CryptoNote::findOutputsToAccount(transaction, addr, viewSecretKey, out, amount);
}
size_t TransactionImpl::getRequiredSignaturesCount(size_t index) const {
return ::getRequiredSignaturesCount(getInputChecked(transaction, index));
}
bool TransactionImpl::validateInputs() const {
return
checkInputTypesSupported(transaction) &&
checkInputsOverflow(transaction) &&
checkInputsKeyimagesDiff(transaction);
}
bool TransactionImpl::validateOutputs() const {
return
checkOutsValid(transaction) &&
checkOutsOverflow(transaction);
}
bool TransactionImpl::validateSignatures() const {
if (transaction.signatures.size() < transaction.inputs.size()) {
return false;
}
for (size_t i = 0; i < transaction.inputs.size(); ++i) {
if (getRequiredSignaturesCount(i) > transaction.signatures[i].size()) {
return false;
}
}
return true;
}
}