Updated on 2026-08-14
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Tangem
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commit
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86 changed files with 9207 additions and 9295 deletions
389
app/src/main/java/com/tangem/domain/wallet/BtcCashEngine.java
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389
app/src/main/java/com/tangem/domain/wallet/BtcCashEngine.java
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package com.tangem.domain.wallet;
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import android.net.Uri;
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import com.tangem.domain.cardReader.CardProtocol;
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import com.tangem.domain.cardReader.TLV;
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import com.tangem.util.Util;
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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.nio.ByteBuffer;
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import java.security.NoSuchAlgorithmException;
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import java.security.NoSuchProviderException;
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import java.text.DecimalFormat;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Date;
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import java.util.List;
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import static com.tangem.domain.wallet.FormatUtil.GetDecimalFormat;
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/**
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* Created by Ilia on 15.02.2018.
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*/
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public class BtcCashEngine extends CoinEngine {
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public String GetNextNode(TangemCard mCard) {
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return "35.157.238.5";
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}
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public int GetNextNodePort(TangemCard mCard) {
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return 51001;
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}
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public String GetNode(TangemCard mCard) {
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return "35.157.238.5";
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}
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public int GetNodePort(TangemCard mCard) {
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return 51001;
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}
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public void SwitchNode(TangemCard mCard) {
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}
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public boolean InOutPutVisible() {
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return true;
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}
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public boolean AwaitingConfirmation(TangemCard card) {
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return card.getBalanceUnconfirmed() != 0;
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}
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public String GetBalanceWithAlter(TangemCard mCard) {
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return GetBalance(mCard);
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}
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public boolean IsBalanceAlterNotZero(TangemCard card) {
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return true;
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}
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public Long GetBalanceLong(TangemCard mCard) {
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return mCard.getBalance();
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}
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public boolean IsBalanceNotZero(TangemCard card) {
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return card.getBalance() > 0;
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}
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public boolean CheckAmount(TangemCard card, String amount) throws Exception {
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DecimalFormat decimalFormat = GetDecimalFormat();
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BigDecimal amountValue = (BigDecimal) decimalFormat.parse(amount);
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// Convert Balance to BigDecimal
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BigDecimal maxValue = new BigDecimal(GetBalanceValue(card));
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maxValue = maxValue.divide(new BigDecimal(1000));
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//if (use_mCurrency) {
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amountValue = amountValue.divide(new BigDecimal(1000));
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//}
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if (amountValue.compareTo(maxValue) > 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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public boolean HasBalanceInfo(TangemCard card) {
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return card.hasBalanceInfo();
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}
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public String GetBalanceCurrency(TangemCard card) {
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return "mBCH";
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}
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public boolean CheckUnspentTransaction(TangemCard mCard) {
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return mCard.getUnspentTransactions().size() != 0;
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}
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public String GetFeeCurrency() {
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return "mBCH";
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}
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public boolean ValdateAddress(String address, TangemCard card) {
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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("1") && !address.startsWith("2") && !address.startsWith("3") && !address.startsWith("n") && !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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if (card.getBlockchain() != Blockchain.BitcoinCashTestNet && card.getBlockchain() != Blockchain.BitcoinCash) {
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return false;
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}
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if (card.getBlockchain() == Blockchain.BitcoinCashTestNet && (address.startsWith("1") || address.startsWith("3"))) {
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return false;
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}
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return true;
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}
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public int GetTokenDecimals(TangemCard card) {
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return 0;
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}
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public String GetContractAddress(TangemCard card) {
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return "";
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}
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public boolean IsNeedCheckNode() {
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return true;
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}
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public Uri getShareWalletURIExplorer(TangemCard mCard) {
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return Uri.parse((mCard.getBlockchain() == Blockchain.BitcoinCash ? "https://bitcoincash.blockexplorer.com/address/" : "https://testnet.blockexplorer.com/address/") + mCard.getWallet());
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}
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public Uri getShareWalletURI(TangemCard mCard) {
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return Uri.parse("bitcoincash:" + mCard.getWallet());
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}
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public boolean CheckAmountValie(TangemCard mCard, String amountValue, String feeValue, Long minFeeInInternalUnits) {
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Long fee = null;
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Long amount = null;
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try {
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amount = mCard.InternalUnitsFromString(amountValue);
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fee = mCard.InternalUnitsFromString(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 == 0 || amount == 0)
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return false;
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if (fee > amount)
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return false;
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if (fee < minFeeInInternalUnits)
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return false;
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return true;
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}
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public String EvaluteFeeEquivalent(TangemCard mCard, String fee) {
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return GetAmountEqualentDescriptor(mCard, fee);
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}
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@Override
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public String GetBalanceEquivalent(TangemCard mCard) {
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Double balance = Double.NaN;
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try {
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Long val = mCard.getBalance();
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balance = mCard.AmountFromInternalUnits(val);
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} catch (Exception ex) {
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mCard.setRate(0);
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}
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return mCard.getAmountEquivalentDescription(balance);
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}
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public String GetBalance(TangemCard mCard) {
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if (mCard.hasBalanceInfo()) {
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Double balance = mCard.AmountFromInternalUnits(mCard.getBalance());
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return mCard.getAmountDescription(balance);
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} else {
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return "-- -- -- " + mCard.getBlockchain().getCurrency();
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}
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}
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public String GetBalanceValue(TangemCard mCard) {
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if (mCard.hasBalanceInfo()) {
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Double balance = mCard.getBalance() / (mCard.getBlockchain().getMultiplier() / 1000.0);
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String output = FormatUtil.DoubleToString(balance);
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//String pattern = "#0.000"; // If you like 4 zeros
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//DecimalFormat myFormatter = new DecimalFormat(pattern);
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//String output = myFormatter.format(balance);
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return output;
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//return Double.toString(balance);
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} else {
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return "0";
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}
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}
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public String calculateAddress(TangemCard mCard, byte[] pkUncompressed) throws NoSuchProviderException, NoSuchAlgorithmException {
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byte netSelectionByte;
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switch (mCard.getBlockchain()) {
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case BitcoinCash:
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netSelectionByte = (byte) 0x00; //0 - MainNet 0x6f - TestNet
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break;
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default:
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netSelectionByte = (byte) 0x6f; //0 - MainNet 0x6f - TestNet
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break;
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}
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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 String ConvertByteArrayToAmount(TangemCard mCard, byte[] bytes) throws Exception {
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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 FormatUtil.DoubleToString(1000.0 * mCard.AmountFromInternalUnits(Util.byteArrayToLong(reversed)));
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}
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@Override
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public byte[] ConvertAmountToByteArray(TangemCard mCard, String amount) throws Exception {
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byte[] bytes = Util.longToByteArray(mCard.InternalUnitsFromString(amount));
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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 String GetAmountDescription(TangemCard mCard, String amount) throws Exception {
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return mCard.getAmountDescription(Double.parseDouble(amount) / 1000.0);
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}
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public static String getAmountEquivalentDescriptionBTC(Double amount, float rate) {
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if (rate > 0) {
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return String.format("≈ USD %.2f", amount * rate);
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} else {
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return "≈ USD ---";
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}
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}
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public String GetAmountEqualentDescriptor(TangemCard mCard, String value) {
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return getAmountEquivalentDescriptionBTC(Double.parseDouble(value) / 1000.0, mCard.getRate());
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}
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public byte[] Sign(String feeValue, String amountValue, String toValue, TangemCard mCard, CardProtocol protocol) throws Exception {
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String myAddress = mCard.getWallet();
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byte[] pbKey = mCard.getWalletPublicKeyRar(); //ALWAYS USING COMPRESS KEY
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String outputAddress = toValue;
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String changeAddress = myAddress;
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// Build script for our address
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List<TangemCard.UnspentTransaction> rawTxList = mCard.getUnspentTransactions();
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byte[] outputScriptWeAreAbleToSpend = Transaction.Script.buildOutput(myAddress).bytes;
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// Collect unspent
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ArrayList<UnspentOutputInfo> unspentOutputs = BTCUtils.getOutputs(rawTxList, outputScriptWeAreAbleToSpend);
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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 = FormatUtil.ConvertStringToLong(feeValue);
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long amount = FormatUtil.ConvertStringToLong(amountValue);
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amount = amount - fees;
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long change = fullAmount - fees - amount;
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if (amount + fees > fullAmount) {
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throw new Exception(String.format("Balance (%d) < amount (%d) + (%d)", fullAmount, change, amount));
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}
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byte[][] dataForSign = new byte[unspentOutputs.size()][];
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for (int i = 0; i < unspentOutputs.size(); ++i) {
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byte[] newTX = BTCUtils.buildTXForSign(myAddress, outputAddress, changeAddress, unspentOutputs, i, amount, change);
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byte[] hashData = Util.calculateSHA256(newTX);
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byte[] doubleHashData = Util.calculateSHA256(hashData);
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unspentOutputs.get(i).bodyDoubleHash = doubleHashData;
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unspentOutputs.get(i).bodyHash = hashData;
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if (mCard.getSigningMethod() == TangemCard.SigningMethod.Sign_Raw || mCard.getSigningMethod() == TangemCard.SigningMethod.Sign_Raw_Validated_By_Issuer) {
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dataForSign[i] = newTX;
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} else {
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dataForSign[i] = doubleHashData;
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}
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}
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byte[] signFromCard = null;
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if (mCard.getSigningMethod() == TangemCard.SigningMethod.Sign_Raw || mCard.getSigningMethod() == TangemCard.SigningMethod.Sign_Raw_Validated_By_Issuer) {
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ByteArrayOutputStream bs = new ByteArrayOutputStream();
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if (dataForSign.length > 10) throw new Exception("To much hashes in one transaction!");
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for (int i = 0; i < dataForSign.length; i++) {
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if (i != 0 && dataForSign[0].length != dataForSign[i].length)
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throw new Exception("Hashes length must be identical!");
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bs.write(dataForSign[i]);
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}
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signFromCard = protocol.run_SignRaw(PINStorage.getPIN2(), bs.toByteArray()).getTLV(TLV.Tag.TAG_Signature).Value;
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} else {
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signFromCard = protocol.run_SignHashes(PINStorage.getPIN2(), dataForSign, mCard.getSigningMethod() == TangemCard.SigningMethod.Sign_Hash_Validated_By_Issuer, null, mCard.getIssuer()).getTLV(TLV.Tag.TAG_Signature).Value;
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// TODO slice signFromCard to hashes.length parts
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}
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LastSignStorage.setLastSignDate(mCard.getWallet(), new Date());
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for (int i = 0; i < unspentOutputs.size(); ++i) {
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BigInteger r = new BigInteger(1, Arrays.copyOfRange(signFromCard, 0 + 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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byte[] encodingSign = DerEncodingUtil.packSignDerBitcoinCash(r, s, pbKey);
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unspentOutputs.get(i).scriptForBuild = encodingSign;
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}
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byte[] realTX = BTCUtils.buildTXForSend(outputAddress, changeAddress, unspentOutputs, amount, change);
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return realTX;
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}
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}
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