Updated on 2026-08-14
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Tangem
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78 changed files with 229 additions and 247 deletions
268
app/src/main/java/com/tangem/wallet/BTCUtils.java
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268
app/src/main/java/com/tangem/wallet/BTCUtils.java
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package com.tangem.wallet;
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/**
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* Created by Ilia on 29.09.2017.
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*/
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import android.util.Log;
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import com.tangem.wallet.btc.BitcoinException;
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import com.tangem.wallet.btc.BitcoinOutputStream;
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import com.tangem.wallet.btc.BtcData;
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import com.tangem.util.CryptoUtil;
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import com.tangem.util.FormatUtil;
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import com.tangem.card_common.util.Util;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.math.BigInteger;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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@SuppressWarnings({"WeakerAccess", "TryWithIdenticalCatches", "unused"})
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public final class BTCUtils {
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static final BigInteger LARGEST_PRIVATE_KEY = new BigInteger("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141", 16);//SECP256K1_N
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public static final long MIN_FEE_PER_KB = 10000;
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public static final long MAX_ALLOWED_FEE = FormatUtil.parseValue("0.1");
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public static final long MIN_PRIORITY_FOR_NO_FEE = 57600000;
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public static final long MIN_MIN_OUTPUT_VALUE_FOR_NO_FEE = 10000000L;
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public static final int MAX_TX_LEN_FOR_NO_FEE = 10000;
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public static final float EXPECTED_BLOCKS_PER_DAY = 144.0f;//(expected confirmations per day)
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public static String toHex(byte[] bytes) {
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if (bytes == null) {
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return "";
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}
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final char[] hexArray = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
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char[] hexChars = new char[bytes.length * 2];
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int v;
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for (int j = 0; j < bytes.length; j++) {
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v = bytes[j] & 0xFF;
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hexChars[j * 2] = hexArray[v >>> 4];
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hexChars[j * 2 + 1] = hexArray[v & 0x0F];
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}
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return new String(hexChars);
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}
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public static byte[] buildTXForSign(String myAddress, String outputAddress, String changeAddress, ArrayList<UnspentOutputInfo> unspentOutputs, int currentInputPos, long amount, long change) throws BitcoinException, IOException {
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byte[] myScript = Transaction.Script.buildOutput(myAddress).bytes;
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unspentOutputs.get(currentInputPos).scriptForBuild = myScript;
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int inputPos = currentInputPos;
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byte[] body = buildBodyTX(outputAddress, changeAddress, unspentOutputs, inputPos, amount, change);
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ByteArrayOutputStream os = new ByteArrayOutputStream();
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os.write(body);
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os.write(new byte[]{0x01, 0x00, 0x00, 0x00});
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byte[] tx = os.toByteArray();
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return tx;
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}
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public static byte[] buildTXForSend(String outputAddress, String changeAddress, ArrayList<UnspentOutputInfo> unspentOutputs, long amount, long change) throws BitcoinException, IOException {
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int inputPos = -1;
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byte[] body = buildBodyTX(outputAddress, changeAddress, unspentOutputs, inputPos, amount, change);
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ByteArrayOutputStream os = new ByteArrayOutputStream();
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os.write(body);
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byte[] tx = os.toByteArray();
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return tx;
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}
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public static byte[] buildBodyTX(String outputAddress, String changeAddress, ArrayList<UnspentOutputInfo> unspentOutputs, int inputPos, long amount, long change) throws BitcoinException, IOException {
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//0200000000
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BitcoinOutputStream forSign = new BitcoinOutputStream();
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forSign.writeInt32(0x01);//write(new byte[]{0x02, 0x00, 0x00, 0x00}); // version
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//01
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byte inputCount = (byte) unspentOutputs.size();
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forSign.write(inputCount); // input count
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//hex str hash prev btc
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for (int i = 0; i < inputCount; ++i) {
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UnspentOutputInfo outPut = unspentOutputs.get(i);
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int outputIndex = outPut.outputIndex;
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byte[] txHash = BTCUtils.reverse(Util.hexToBytes(outPut.txHashForBuild));//Sha256Hash.hash(rawTxByte);
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forSign.write(txHash);
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forSign.writeInt32(outputIndex); //output index in prev tx
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if (inputPos == -1 || i == inputPos) {
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// hex str 1976a914....88ac
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forSign.write((byte) outPut.scriptForBuild.length);
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forSign.write(outPut.scriptForBuild);
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} else {
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forSign.write(0x00);
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}
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//ffffffff
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forSign.write(new byte[]{(byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff}); // sequence
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}
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//02
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byte outputCount = (byte) ((change == 0) ? 1 : 2); // outputCount
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forSign.write(outputCount);
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//8 bytes
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forSign.writeInt64(amount); //amount
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byte[] sendScript = Transaction.Script.buildOutput(outputAddress).bytes; // build out
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//hex str 1976a914....88ac
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forSign.write((byte) sendScript.length);
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forSign.write(sendScript);
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if (change != 0) {
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//8 bytes
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forSign.writeInt64(change); // change
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//hex str 1976a914....88ac
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byte[] chancheScript = Transaction.Script.buildOutput(changeAddress).bytes; //build out
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forSign.write((byte) chancheScript.length);
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forSign.write(chancheScript);
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}
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//00000000
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forSign.write(new byte[]{0x00, 0x00, 0x00, 0x00});
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//forSign.write(new byte[]{0x01, 0x00, 0x00, 0x00});
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byte[] rawData = forSign.toByteArray();
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Log.e("Sign_TX_Body", BTCUtils.toHex(rawData));
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return rawData;
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}
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public static byte[] buildBodyTX(String outputAddress, String changeAddress, int outputIndex, String prevID, long amount, long change, byte[] script) throws BitcoinException, IOException {
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//0200000000
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BitcoinOutputStream forSign = new BitcoinOutputStream();
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forSign.writeInt32(0x01);//write(new byte[]{0x02, 0x00, 0x00, 0x00}); // version
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//01
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byte inputCount = 1;
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forSign.write(inputCount); // input count
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//hex str hash prev btc
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byte[] txHash = BTCUtils.reverse(Util.hexToBytes(prevID));//Sha256Hash.hash(rawTxByte);
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forSign.write(txHash); //previos tx hash
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//00000000
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//byte indexOutput = outputIndex;
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forSign.writeInt32(outputIndex/*indexOutput*/); //output index in prev tx
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//forSign.write(0x00);
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// hex str 1976a914....88ac
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forSign.write((byte) script.length);
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forSign.write(script);
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//ffffffff
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forSign.write(new byte[]{(byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff}); // sequence
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//02
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byte outputCount = (byte) ((change == 0) ? 1 : 2); // outputCount
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forSign.write(outputCount);
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//8 bytes
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forSign.writeInt64(amount); //amount
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byte[] sendScript = Transaction.Script.buildOutput(outputAddress).bytes; // build out
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//hex str 1976a914....88ac
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forSign.write((byte) sendScript.length);
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forSign.write(sendScript);
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if (change != 0) {
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//8 bytes
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forSign.writeInt64(change); // change
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//hex str 1976a914....88ac
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byte[] chancheScript = Transaction.Script.buildOutput(changeAddress).bytes; //build out
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forSign.write((byte) chancheScript.length);
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forSign.write(chancheScript);
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}
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//00000000
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forSign.write(new byte[]{0x00, 0x00, 0x00, 0x00});
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byte[] rawData = forSign.toByteArray();
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//Log.e("Sign_TX_Body", BTCUtils.toHex(rawData));
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return rawData;
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}
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public static ArrayList<UnspentOutputInfo> getOutputs(List<BtcData.UnspentTransaction> rawTxList, byte[] outputScriptWeAreAbleToSpend) throws BitcoinException {
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ArrayList<UnspentOutputInfo> unspentOutputs = new ArrayList<>();
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for (BtcData.UnspentTransaction current : rawTxList) {
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byte[] rawTxByte = BTCUtils.fromHex(current.Raw);
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if (rawTxByte == null || current.Raw.isEmpty()) {
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continue;
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}
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Transaction baseTx = new Transaction(rawTxByte);
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if (baseTx.inputs.length == 0 || baseTx.outputs.length == 0)
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throw new IllegalArgumentException("Unable to decode given transaction");
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byte[] txHash = BTCUtils.reverse(CryptoUtil.doubleSha256(rawTxByte));
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String txHashForBuild = current.txID;
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byte[] sign = null;
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for (int outputIndex = 0; outputIndex < baseTx.outputs.length; outputIndex++) {
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Transaction.Output output = baseTx.outputs[outputIndex];
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// find outputs
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if (Arrays.equals(outputScriptWeAreAbleToSpend, output.script.bytes)) {
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unspentOutputs.add(new UnspentOutputInfo(txHash, output.script, output.value, outputIndex, -1, txHashForBuild, sign));
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}
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}
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}
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return unspentOutputs;
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}
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public static byte[] fromHex(String s) {
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if (s != null) {
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try {
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StringBuilder sb = new StringBuilder(s.length());
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for (int i = 0; i < s.length(); i++) {
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char ch = s.charAt(i);
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if (!Character.isWhitespace(ch)) {
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sb.append(ch);
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}
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}
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s = sb.toString();
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int len = s.length();
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byte[] data = new byte[len / 2];
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for (int i = 0; i < len; i += 2) {
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int hi = (Character.digit(s.charAt(i), 16) << 4);
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int low = Character.digit(s.charAt(i + 1), 16);
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if (hi >= 256 || low < 0 || low >= 16) {
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return null;
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}
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data[i / 2] = (byte) (hi | low);
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}
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return data;
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} catch (Exception ignored) {
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}
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}
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return null;
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}
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public static byte[] reverse(byte[] bytes) {
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byte[] result = new byte[bytes.length];
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for (int i = 0; i < bytes.length; i++) {
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result[i] = bytes[bytes.length - i - 1];
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}
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return result;
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}
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public static byte[] reverseInPlace(byte[] bytes) {
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int len = bytes.length / 2;
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for (int i = 0; i < len; i++) {
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byte t = bytes[i];
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bytes[i] = bytes[bytes.length - i - 1];
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bytes[bytes.length - i - 1] = t;
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}
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return bytes;
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}
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}
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