493 lines
No EOL
17 KiB
Java
493 lines
No EOL
17 KiB
Java
package com.tangem.wallet.ltc;
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import android.net.Uri;
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import android.text.InputFilter;
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import com.tangem.wallet.BTCUtils;
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import com.tangem.wallet.BalanceValidator;
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import com.tangem.wallet.Base58;
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import com.tangem.wallet.CoinData;
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import com.tangem.wallet.TangemContext;
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import com.tangem.wallet.Transaction;
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import com.tangem.wallet.UnspentOutputInfo;
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import com.tangem.wallet.btc.BtcData;
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import com.tangem.wallet.btc.BtcEngine;
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import com.tangem.card_common.data.TangemCard;
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import com.tangem.card_common.reader.CardProtocol;
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import com.tangem.card_common.tasks.SignTask;
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import com.tangem.card_common.util.Util;
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import com.tangem.util.CryptoUtil;
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import com.tangem.util.DecimalDigitsInputFilter;
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import com.tangem.util.DerEncodingUtil;
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import com.tangem.wallet.R;
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import java.io.ByteArrayOutputStream;
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import java.math.BigDecimal;
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import java.math.BigInteger;
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import java.math.RoundingMode;
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import java.nio.ByteBuffer;
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import java.security.NoSuchAlgorithmException;
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import java.security.NoSuchProviderException;
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import java.util.ArrayList;
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import java.util.Arrays;
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public class LtcEngine extends BtcEngine {
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private static final String TAG = LtcEngine.class.getSimpleName();
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public BtcData coinData = null;
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public LtcEngine(TangemContext context) throws Exception {
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super(context);
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if (context.getCoinData() == null) {
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coinData = new BtcData();
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context.setCoinData(coinData);
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} else if (context.getCoinData() instanceof BtcData) {
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coinData = (BtcData) context.getCoinData();
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} else {
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throw new Exception("Invalid type of Blockchain data for LtcEngine");
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}
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}
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public LtcEngine() {
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super();
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}
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private static int getDecimals() {
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return 8;
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}
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private void checkBlockchainDataExists() throws Exception {
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if (coinData == null) throw new Exception("No blockchain data");
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}
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@Override
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public boolean awaitingConfirmation() {
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if (coinData == null) return false;
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return coinData.getBalanceUnconfirmed() != 0;
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}
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@Override
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public String getBalanceHTML() {
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Amount balance = getBalance();
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if (balance != null) {
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return balance.toDescriptionString(getDecimals());
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} else {
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return "";
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}
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}
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@Override
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public String getBalanceCurrency() {
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return "LTC";
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}
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@Override
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public boolean isBalanceNotZero() {
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if (coinData == null) return false;
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if (coinData.getBalanceInInternalUnits() == null) return false;
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return coinData.getBalanceInInternalUnits().notZero();
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}
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@Override
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public boolean hasBalanceInfo() {
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if (coinData == null) return false;
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return coinData.hasBalanceInfo();
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}
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@Override
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public boolean isExtractPossible() {
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if (!hasBalanceInfo()) {
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ctx.setMessage(R.string.cannot_obtain_data_from_blockchain);
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} else if (!isBalanceNotZero()) {
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ctx.setMessage(R.string.wallet_empty);
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} else if (awaitingConfirmation()) {
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ctx.setMessage(R.string.please_wait_while_previous);
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} else if (coinData.getUnspentTransactions().size() == 0) {
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ctx.setMessage(R.string.please_wait_for_confirmation);
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} else {
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return true;
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}
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return false;
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}
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@Override
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public String getFeeCurrency() {
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return "LTC";
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}
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@Override
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public boolean validateAddress(String address) {
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if (address == null || address.isEmpty()) {
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return false;
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}
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if (address.length() < 25) {
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return false;
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}
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if (address.length() > 35) {
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return false;
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}
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if (!address.startsWith("L") && !address.startsWith("M")) {
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return false;
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}
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byte[] decAddress = Base58.decodeBase58(address);
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if (decAddress == null || decAddress.length == 0) {
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return false;
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}
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byte[] rip = new byte[21];
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for (int i = 0; i < 21; ++i) {
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rip[i] = decAddress[i];
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}
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byte[] kcv = CryptoUtil.doubleSha256(rip);
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for (int i = 0; i < 4; ++i) {
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if (kcv[i] != decAddress[21 + i])
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return false;
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}
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return true;
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}
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@Override
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public boolean isNeedCheckNode() {
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return true;
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}
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@Override
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public Uri getWalletExplorerUri() {
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return Uri.parse("https://live.blockcypher.com/ltc/address/" + ctx.getCoinData().getWallet());
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}
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@Override
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public Uri getShareWalletUri() {
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if (ctx.getCard().getDenomination() != null) {
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return Uri.parse("litecoin:" + ctx.getCoinData().getWallet() + "?amount=" + convertToAmount(convertToInternalAmount(ctx.getCard().getDenomination())).toValueString(8));
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} else {
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return Uri.parse("litecoin:" + ctx.getCoinData().getWallet());
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}
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}
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@Override
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public InputFilter[] getAmountInputFilters() {
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return new InputFilter[]{new DecimalDigitsInputFilter(getDecimals())};
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}
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@Override
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public boolean checkNewTransactionAmount(Amount amount) {
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if (coinData == null) return false;
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if (amount.compareTo(convertToAmount(coinData.getBalanceInInternalUnits())) > 0) {
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return false;
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}
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return true;
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}
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@Override
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public boolean checkNewTransactionAmountAndFee(Amount amountValue, Amount feeValue, Boolean isIncludeFee) {
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InternalAmount fee;
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InternalAmount amount;
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try {
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checkBlockchainDataExists();
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amount = convertToInternalAmount(amountValue);
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fee = convertToInternalAmount(feeValue);
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} catch (Exception e) {
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e.printStackTrace();
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return false;
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}
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if (fee == null || amount == null)
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return false;
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if (fee.isZero() || amount.isZero())
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return false;
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if (isIncludeFee && (amount.compareTo(coinData.getBalanceInInternalUnits()) > 0 || amount.compareTo(fee) < 0))
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return false;
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if (!isIncludeFee && amount.add(fee).compareTo(coinData.getBalanceInInternalUnits()) > 0)
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return false;
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return true;
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}
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@Override
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public boolean validateBalance(BalanceValidator balanceValidator) {
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if (((ctx.getCard().getOfflineBalance() == null) && !ctx.getCoinData().isBalanceReceived()) || (!ctx.getCoinData().isBalanceReceived() && (ctx.getCard().getRemainingSignatures() != ctx.getCard().getMaxSignatures()))) {
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balanceValidator.setScore(0);
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balanceValidator.setFirstLine("Unknown balance");
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balanceValidator.setSecondLine("Balance cannot be verified. Swipe down to refresh.");
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return false;
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}
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// Workaround before new back-end
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// if (card.getRemainingSignatures() == card.getMaxSignatures()) {
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// firstLine = "Verified balance";
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// secondLine = "Balance confirmed in blockchain. ";
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// secondLine += "Verified note identity. ";
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// return;
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// }
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if (coinData.getBalanceUnconfirmed() != 0) {
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balanceValidator.setScore(0);
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balanceValidator.setFirstLine("Transaction in progress");
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balanceValidator.setSecondLine("Wait for confirmation in blockchain");
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return false;
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}
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if (coinData.isBalanceReceived() && coinData.isBalanceEqual()) {
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balanceValidator.setScore(100);
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balanceValidator.setFirstLine("Verified balance");
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balanceValidator.setSecondLine("Balance confirmed in blockchain");
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if (coinData.getBalanceInInternalUnits().isZero()) {
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balanceValidator.setFirstLine("Empty wallet");
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balanceValidator.setSecondLine("");
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}
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}
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// rule 4 TODO: need to check SignedHashed against number of outputs in blockchain
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// if((card.getRemainingSignatures() != card.getMaxSignatures()) && card.getBalance() != 0)
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// {
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// score = 80;
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// firstLine = "Unguaranteed balance";
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// secondLine = "Potential unsent transaction. Redeem immediately if accept. ";
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// return;
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// }
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if ((ctx.getCard().getOfflineBalance() != null) && !coinData.isBalanceReceived() && (ctx.getCard().getRemainingSignatures() == ctx.getCard().getMaxSignatures()) && coinData.getBalanceInInternalUnits().notZero()) {
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balanceValidator.setScore(80);
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balanceValidator.setFirstLine("Verified offline balance");
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balanceValidator.setSecondLine("Can't obtain balance from blockchain. Restore internet connection to be more confident. ");
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}
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// if(card.getFailedBalanceRequestCounter()!=0) {
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// score -= 5 * card.getFailedBalanceRequestCounter();
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// secondLine += "Not all nodes have returned balance. Swipe down or tap again. ";
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// if(score <= 0)
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// return;
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// }
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//
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// if(card.isBalanceReceived() && !card.isBalanceEqual()) {
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// score = 0;
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// firstLine = "Disputed balance";
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// secondLine += " Cannot obtain trusted balance at the moment. Try to tap and check this banknote later.";
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// return;
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// }
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return true;
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}
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@Override
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public Amount getBalance() {
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if (!hasBalanceInfo()) return null;
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return convertToAmount(coinData.getBalanceInInternalUnits());
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}
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@Override
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public String evaluateFeeEquivalent(String fee) {
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if (!coinData.getAmountEquivalentDescriptionAvailable()) return "";
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try {
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Amount feeAmount = new Amount(fee, getFeeCurrency());
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return feeAmount.toEquivalentString(coinData.getRate());
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} catch (Exception e) {
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return "";
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}
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}
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@Override
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public String getBalanceEquivalent() {
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if (coinData == null || !coinData.getAmountEquivalentDescriptionAvailable()) return "";
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Amount balance = getBalance();
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if (balance == null) return "";
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return balance.toEquivalentString(coinData.getRate());
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}
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@Override
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public String calculateAddress(byte[] pkUncompressed) throws NoSuchProviderException, NoSuchAlgorithmException {
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byte netSelectionByte = (byte) 0x30;
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byte hash1[] = Util.calculateSHA256(pkUncompressed);
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byte hash2[] = Util.calculateRIPEMD160(hash1);
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ByteBuffer BB = ByteBuffer.allocate(hash2.length + 1);
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BB.put(netSelectionByte);
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BB.put(hash2);
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byte hash3[] = Util.calculateSHA256(BB.array());
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byte hash4[] = Util.calculateSHA256(hash3);
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BB = ByteBuffer.allocate(hash2.length + 5);
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BB.put(netSelectionByte); //BB.put((byte) 0x6f);
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BB.put(hash2);
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BB.put(hash4[0]);
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BB.put(hash4[1]);
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BB.put(hash4[2]);
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BB.put(hash4[3]);
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return org.bitcoinj.core.Base58.encode(BB.array());
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}
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@Override
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public Amount convertToAmount(InternalAmount internalAmount) {
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BigDecimal d = internalAmount.divide(new BigDecimal("100000000"));
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return new Amount(d, getBalanceCurrency());
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}
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@Override
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public Amount convertToAmount(String strAmount, String currency) {
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return new Amount(strAmount, currency);
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}
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@Override
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public InternalAmount convertToInternalAmount(Amount amount) {
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BigDecimal d = amount.multiply(new BigDecimal("100000000"));
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return new InternalAmount(d, "Satoshi");
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}
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@Override
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public InternalAmount convertToInternalAmount(byte[] bytes) {
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if (bytes == null) return null;
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byte[] reversed = new byte[bytes.length];
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for (int i = 0; i < bytes.length; i++) reversed[i] = bytes[bytes.length - i - 1];
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return new InternalAmount(Util.byteArrayToLong(reversed), "Satoshi");
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}
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@Override
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public byte[] convertToByteArray(InternalAmount internalAmount) {
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byte[] bytes = Util.longToByteArray(internalAmount.longValueExact());
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byte[] reversed = new byte[bytes.length];
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for (int i = 0; i < bytes.length; i++) reversed[i] = bytes[bytes.length - i - 1];
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return reversed;
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}
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@Override
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public CoinData createCoinData() {
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return new BtcData();
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}
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@Override
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public String getUnspentInputsDescription() {
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return coinData.getUnspentInputsDescription();
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}
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@Override
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public SignTask.TransactionToSign constructTransaction(Amount amountValue, Amount feeValue, boolean IncFee, String targetAddress) throws Exception {
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ArrayList<UnspentOutputInfo> unspentOutputs = new ArrayList<>();
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checkBlockchainDataExists();
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String myAddress = ctx.getCoinData().getWallet();
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byte[] pbKey = ctx.getCard().getWalletPublicKey();
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for (BtcData.UnspentTransaction utxo : coinData.getUnspentTransactions()) {
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unspentOutputs.add(new UnspentOutputInfo(BTCUtils.fromHex(utxo.txID), new Transaction.Script(BTCUtils.fromHex(utxo.script)), utxo.amount, utxo.outputN, -1, utxo.txID, null));
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}
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long fullAmount = 0;
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for (int i = 0; i < unspentOutputs.size(); ++i) {
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fullAmount += unspentOutputs.get(i).value;
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}
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long fees = convertToInternalAmount(feeValue).longValueExact();
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long amount = convertToInternalAmount(amountValue).longValueExact();
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long change = fullAmount - amount;
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if (IncFee) {
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amount = amount - fees;
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} else {
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change = change - fees;
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}
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final long amountFinal=amount;
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final long changeFinal=change;
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if (amount + fees > fullAmount) {
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throw new CardProtocol.TangemException_WrongAmount(String.format("Balance (%d) < change (%d) + amount (%d)", fullAmount, change, amount));
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}
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final byte[][] txForSign = new byte[unspentOutputs.size()][];
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final byte[][] bodyDoubleHash = new byte[unspentOutputs.size()][];
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final byte[][] bodyHash= new byte[unspentOutputs.size()][];
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for (int i = 0; i < unspentOutputs.size(); ++i) {
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txForSign[i] = BTCUtils.buildTXForSign(myAddress, targetAddress, myAddress, unspentOutputs, i, amount, change);
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bodyHash[i] = Util.calculateSHA256(txForSign[i]);
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bodyDoubleHash[i] = Util.calculateSHA256(bodyHash[i]);
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}
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return new SignTask.TransactionToSign() {
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@Override
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public boolean isSigningMethodSupported(TangemCard.SigningMethod signingMethod) {
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return signingMethod==TangemCard.SigningMethod.Sign_Hash || signingMethod==TangemCard.SigningMethod.Sign_Raw;
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}
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@Override
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public byte[][] getHashesToSign() throws Exception {
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byte[][] dataForSign=new byte[unspentOutputs.size()][];
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if (txForSign.length > 10) throw new Exception("To much hashes in one transaction!");
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for (int i = 0; i < unspentOutputs.size(); ++i) {
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dataForSign[i] = bodyDoubleHash[i];
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}
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return dataForSign;
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}
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@Override
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public byte[] getRawDataToSign() throws Exception {
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ByteArrayOutputStream bs = new ByteArrayOutputStream();
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for (int i = 0; i < txForSign.length; i++) {
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if (i != 0 && txForSign[0].length != txForSign[i].length)
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throw new Exception("Hashes length must be identical!");
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bs.write(txForSign[i]);
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}
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return bs.toByteArray();
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}
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@Override
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public String getHashAlgToSign() {
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return "sha-256x2";
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}
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@Override
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public byte[] getIssuerTransactionSignature(byte[] dataToSignByIssuer) throws Exception {
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throw new Exception("Issuer validation not supported!");
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}
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@Override
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public byte[] onSignCompleted(byte[] signFromCard) throws Exception {
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for (int i = 0; i < unspentOutputs.size(); ++i) {
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BigInteger r = new BigInteger(1, Arrays.copyOfRange(signFromCard, i * 64, 32 + i * 64));
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BigInteger s = new BigInteger(1, Arrays.copyOfRange(signFromCard, 32 + i * 64, 64 + i * 64));
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s = CryptoUtil.toCanonicalised(s);
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unspentOutputs.get(i).scriptForBuild = DerEncodingUtil.packSignDer(r, s, pbKey);
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}
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byte[] txForSend=BTCUtils.buildTXForSend(targetAddress, myAddress, unspentOutputs, amountFinal, changeFinal);
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notifyOnNeedSendTransaction(txForSend);
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return txForSend;
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}
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};
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}
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private final static BigDecimal relayFee = new BigDecimal(0.00001).setScale(8, RoundingMode.DOWN);
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@Override
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public void requestFee(BlockchainRequestsCallbacks blockchainRequestsCallbacks, String targetAddress, Amount amount) throws Exception {
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coinData.minFee = coinData.normalFee = coinData.maxFee = new Amount(relayFee, "LTC");
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blockchainRequestsCallbacks.onComplete(true);
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}
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@Override
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public boolean allowSelectFeeLevel() {
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return false;
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}
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} |