org.bitcoinj.core.Utils类的使用及代码示例

x33g5p2x  于2022-02-01 转载在 其他  
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本文整理了Java中org.bitcoinj.core.Utils类的一些代码示例，展示了Utils类的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Utils类的具体详情如下：
包路径：org.bitcoinj.core.Utils
类名称：Utils

Utils介绍

[英]A collection of various utility methods that are helpful for working with the Bitcoin protocol. To enable debug logging from the library, run with -Dbitcoinj.logging=true on your command line.
[中]有助于使用比特币协议的各种实用方法的集合。要从库中启用调试日志记录，请使用-Dbitcoinj运行。在命令行上记录=true。

代码示例

代码示例来源：origin: cash.bitcoinj/bitcoinj-core

/**
 * Generates a new key chain with entropy selected randomly from the given {@link java.security.SecureRandom}
 * object and of the requested size in bits.
 */
public DeterministicKeyChain(SecureRandom random, int bits) {
  this(random, bits, DEFAULT_PASSPHRASE_FOR_MNEMONIC, Utils.currentTimeSeconds());
}

代码示例来源：origin: fr.acinq/bitcoinj-core

private void checkTimestamp() throws VerificationException {
  final long allowedTime = Utils.currentTimeSeconds() + ALLOWED_TIME_DRIFT;
  if (time > allowedTime)
    throw new VerificationException(String.format(Locale.US,
        "Block too far in future: %s (%d) vs allowed %s (%d)", Utils.dateTimeFormat(time * 1000), time,
        Utils.dateTimeFormat(allowedTime * 1000), allowedTime));
}

代码示例来源：origin: dogecoin/libdohj

public AbstractLitecoinParams() {
  super();
  interval = LITE_INTERVAL;
  targetTimespan = LITE_TARGET_TIMESPAN;
  maxTarget = Utils.decodeCompactBits(0x1e0fffffL);
  packetMagic = 0xfbc0b6db;
  bip32HeaderPub = 0x0488C42E; //The 4 byte header that serializes in base58 to "xpub". (?)
  bip32HeaderPriv = 0x0488E1F4; //The 4 byte header that serializes in base58 to "xprv" (?)
}

代码示例来源：origin: dogecoin/libdohj

@Override
protected void bitcoinSerializeToStream(OutputStream stream) throws IOException {
  stream.write(new VarInt(hashes.size()).encode());
  for (Sha256Hash hash: hashes) {
      stream.write(Utils.reverseBytes(hash.getBytes()));
  }
  Utils.uint32ToByteStreamLE(index, stream);
}

代码示例来源：origin: cash.bitcoinj/bitcoinj-core

stack.add(Utils.reverseBytes(Utils.encodeMPI(BigInteger.ONE.negate(), false)));
  break;
case OP_1:
case OP_15:
case OP_16:
  stack.add(Utils.reverseBytes(Utils.encodeMPI(BigInteger.valueOf(decodeFromOpN(opcode)), false)));
  break;
case OP_NOP:
  break;
case OP_DEPTH:
  stack.add(Utils.reverseBytes(Utils.encodeMPI(BigInteger.valueOf(stack.size()), false)));
  break;
case OP_DROP:
  if (stack.size() < 1)
    throw new ScriptException("Attempted OP_SIZE on an empty stack");
  stack.add(Utils.reverseBytes(Utils.encodeMPI(BigInteger.valueOf(stack.getLast().length), false)));
  break;
case OP_INVERT:
  stack.add(Utils.reverseBytes(Utils.encodeMPI(numericOPnum, false)));
  break;
case OP_2MUL:
  stack.add(Utils.reverseBytes(Utils.encodeMPI(numericOPresult, false)));
  break;
case OP_MUL:

代码示例来源：origin: dogecoin/libdohj

BigInteger newTarget = Utils.decodeCompactBits(lastDifficultyTarget);
newTarget = newTarget.multiply(BigInteger.valueOf(actualTime));
newTarget = newTarget.divide(BigInteger.valueOf(retargetTimespan));
return Utils.encodeCompactBits(newTarget);

代码示例来源：origin: fr.acinq/bitcoinj-core

public static Script createCLTVPaymentChannelOutput(BigInteger time, ECKey from, ECKey to) {
  byte[] timeBytes = Utils.reverseBytes(Utils.encodeMPI(time, false));
  if (timeBytes.length > 5) {
    throw new RuntimeException("Time too large to encode as 5-byte int");
  }
  return new ScriptBuilder().op(OP_IF)
      .data(to.getPubKey()).op(OP_CHECKSIGVERIFY)
      .op(OP_ELSE)
      .data(timeBytes).op(OP_CHECKLOCKTIMEVERIFY).op(OP_DROP)
      .op(OP_ENDIF)
      .data(from.getPubKey()).op(OP_CHECKSIG).build();
}

代码示例来源：origin: fr.acinq/bitcoinj-core

/** Gets the hash160 form of the public key (as seen in addresses). */
public byte[] getPubKeyHash() {
  if (pubKeyHash == null)
    pubKeyHash = Utils.sha256hash160(this.pub.getEncoded());
  return pubKeyHash;
}

代码示例来源：origin: cash.bitcoinj/bitcoinj-core

/**
 * Called when download progress is made.
 *
 * @param pct  the percentage of chain downloaded, estimated
 * @param date the date of the last block downloaded
 */
protected void progress(double pct, int blocksSoFar, Date date) {
  log.info(String.format(Locale.US, "Chain download %d%% done with %d blocks to go, block date %s", (int) pct, blocksSoFar,
      Utils.dateTimeFormat(date)));
}

代码示例来源：origin: cash.bitcoinj/bitcoinj-core

/**
 * Signs a text message using the standard Bitcoin messaging signing format and returns the signature as a base64
 * encoded string.
 *
 * @throws IllegalStateException if this ECKey does not have the private part.
 * @throws KeyCrypterException if this ECKey is encrypted and no AESKey is provided or it does not decrypt the ECKey.
 */
public String signMessage(String message, @Nullable KeyParameter aesKey) throws KeyCrypterException {
  byte[] data = Utils.formatMessageForSigning(message);
  Sha256Hash hash = Sha256Hash.twiceOf(data);
  ECDSASignature sig = sign(hash, aesKey);
  // Now we have to work backwards to figure out the recId needed to recover the signature.
  int recId = -1;
  for (int i = 0; i < 4; i++) {
    ECKey k = ECKey.recoverFromSignature(i, sig, hash, isCompressed());
    if (k != null && k.pub.equals(pub)) {
      recId = i;
      break;
    }
  }
  if (recId == -1)
    throw new RuntimeException("Could not construct a recoverable key. This should never happen.");
  int headerByte = recId + 27 + (isCompressed() ? 4 : 0);
  byte[] sigData = new byte[65];  // 1 header + 32 bytes for R + 32 bytes for S
  sigData[0] = (byte)headerByte;
  System.arraycopy(Utils.bigIntegerToBytes(sig.r, 32), 0, sigData, 1, 32);
  System.arraycopy(Utils.bigIntegerToBytes(sig.s, 32), 0, sigData, 33, 32);
  return new String(Base64.encode(sigData), Charset.forName("UTF-8"));
}

代码示例来源：origin: cash.bitcoinj/bitcoinj-core

/**
 * Called by a {@link Peer} when a transaction is pending and announced by a peer. The more peers announce the
 * transaction, the more peers have validated it (assuming your internet connection is not being intercepted).
 * If confidence is currently unknown, sets it to {@link ConfidenceType#PENDING}. Does not run listeners.
 *
 * @param address IP address of the peer, used as a proxy for identity.
 * @return true if marked, false if this address was already seen
 */
public boolean markBroadcastBy(PeerAddress address) {
  lastBroadcastedAt = Utils.now();
  if (!broadcastBy.addIfAbsent(address))
    return false;  // Duplicate.
  synchronized (this) {
    if (getConfidenceType() == ConfidenceType.UNKNOWN) {
      this.confidenceType = ConfidenceType.PENDING;
    }
  }
  return true;
}

代码示例来源：origin: greenaddress/GreenBits

/**
 * Returns a reversed copy of the internal byte array.
 */
public byte[] getReversedBytes() {
  return Utils.reverseBytes(bytes);
}

代码示例来源：origin: cash.bitcoinj/bitcoinj-core

/** Track a success - reset back off interval to the initial value */
public final void trackSuccess() {
  backoff = params.initial;
  retryTime = Utils.currentTimeMillis();
}

代码示例来源：origin: greenaddress/GreenBits

@Test
public void keyRotationRandom() throws Exception {
  Utils.setMockClock();
  key1.setCreationTimeSeconds(Utils.currentTimeSeconds() - (86400 * 2));
  ECKey key2 = new ECKey();
  key2.setCreationTimeSeconds(Utils.currentTimeSeconds() - 86400);
  wallet.importKey(key1);
  wallet.importKey(key2);
  sendMoneyToWallet(wallet, AbstractBlockChain.NewBlockType.BEST_CHAIN, CENT, key2.toAddress(PARAMS));
  sendMoneyToWallet(wallet, AbstractBlockChain.NewBlockType.BEST_CHAIN, CENT, key2.toAddress(PARAMS));
  Date compromiseTime = Utils.now();
  assertEquals(0, broadcaster.size());
  assertFalse(wallet.isKeyRotating(key1));
  Utils.rollMockClock(1);
  wallet.setKeyRotationTime(compromiseTime);
  assertTrue(wallet.isKeyRotating(key1));

代码示例来源：origin: cash.bitcoinj/bitcoinj-core

void verifyDifficulty(BigInteger newTarget, Block nextBlock)
{
  if (newTarget.compareTo(this.getMaxTarget()) > 0) {
    log.info("Difficulty hit proof of work limit: {}", newTarget.toString(16));
    newTarget = this.getMaxTarget();
  }
  int accuracyBytes = (int) (nextBlock.getDifficultyTarget() >>> 24) - 3;
  long receivedTargetCompact = nextBlock.getDifficultyTarget();
  // The calculated difficulty is to a higher precision than received, so reduce here.
  BigInteger mask = BigInteger.valueOf(0xFFFFFFL).shiftLeft(accuracyBytes * 8);
  newTarget = newTarget.and(mask);
  long newTargetCompact = Utils.encodeCompactBits(newTarget);
  if (newTargetCompact != receivedTargetCompact)
    throw new VerificationException("Network provided difficulty bits do not match what was calculated: " +
        Long.toHexString(newTargetCompact) + " vs " + Long.toHexString(receivedTargetCompact));
}

代码示例来源：origin: greenaddress/GreenBits

@Test
public void serializationUnencrypted() throws UnreadableWalletException {
  Utils.setMockClock();
  Date now = Utils.now();
  final ECKey key1 = new ECKey();
  Utils.rollMockClock(5000);
  final ECKey key2 = new ECKey();
  chain.importKeys(ImmutableList.of(key1, key2));
  List<Protos.Key> keys = chain.serializeToProtobuf();
  assertEquals(2, keys.size());
  assertArrayEquals(key1.getPubKey(), keys.get(0).getPublicKey().toByteArray());
  assertArrayEquals(key2.getPubKey(), keys.get(1).getPublicKey().toByteArray());
  assertArrayEquals(key1.getPrivKeyBytes(), keys.get(0).getSecretBytes().toByteArray());
  assertArrayEquals(key2.getPrivKeyBytes(), keys.get(1).getSecretBytes().toByteArray());
  long normTime = (long) (Math.floor(now.getTime() / 1000) * 1000);
  assertEquals(normTime, keys.get(0).getCreationTimestamp());
  assertEquals(normTime + 5000 * 1000, keys.get(1).getCreationTimestamp());
  chain = BasicKeyChain.fromProtobufUnencrypted(keys);
  assertEquals(2, chain.getKeys().size());
  assertEquals(key1, chain.getKeys().get(0));
  assertEquals(key2, chain.getKeys().get(1));
}

代码示例来源：origin: HashEngineering/dashj

public static boolean verifyMessage(byte [] pubkeyId, MasternodeSignature vchSig, String message,
                    StringBuilder errorMessage) {
    byte [] dataToHash = Utils.formatMessageForSigning(message);
    return HashSigner.verifyHash(Sha256Hash.twiceOf(dataToHash), pubkeyId, vchSig, errorMessage);
  }
}

代码示例来源：origin: HashEngineering/dashj

public static boolean verifyMessage1(PublicKey pubkey, MasternodeSignature vchSig, byte[] message, StringBuilder errorMessage)
{
  //int length = Utils.BITCOIN_SIGNED_MESSAGE_HEADER.length()+strMessage.length();
  byte dataToHash []; // = (Utils.BITCOIN_SIGNED_MESSAGE_HEADER_BYTES+strMessage).getBytes();
  //ByteOutputStream bos = new ByteOutputStream(message.length + Utils.BITCOIN_SIGNED_MESSAGE_HEADER_BYTES.length);
  //bos.write(Utils.BITCOIN_SIGNED_MESSAGE_HEADER_BYTES);
  //bos.write(message);
  dataToHash = Utils.formatMessageForSigning(message);//bos.getBytes();
  //PublicKey pubkey2;
  ECKey pubkey2 = null;
  try {
    // pubkey2 = PublicKey.recoverCompact(Sha256Hash.twiceOf(dataToHash), vchSig);
    //ECKey.verify()
    //if(DarkCoinSystem.fDebug && !pubkey.getId().equals(pubkey2.getId()));
    //    log.info("DarkSendSigner.verifyMessage -- keys don't match: " + pubkey2.getId().toString()+ " " + pubkey.getId().toString());
    //return pubkey.getId().equals(pubkey2.getId());
    //return true;
    pubkey2 = ECKey.fromPublicOnly(pubkey.getBytes());
    pubkey2.verifyMessage(message, vchSig.getBytes());
    return true;
  }
  catch(SignatureException x)
  {
    errorMessage.append("keys don't match - input: "+Utils.HEX.encode(pubkey.getId()));
    errorMessage.append(", recovered: " + (pubkey2 != null ? Utils.HEX.encode(pubkey2.getPubKeyHash()) : "null"));
    errorMessage.append(", message: "+ Utils.sanitizeString(new String(message)));
    errorMessage.append(", sig:  not impl!\n" + x.getMessage());
    return false;
  }
}

代码示例来源：origin: fr.acinq/bitcoinj-core

stack.add(Utils.reverseBytes(Utils.encodeMPI(BigInteger.ONE.negate(), false)));
  break;
case OP_1:
case OP_15:
case OP_16:
  stack.add(Utils.reverseBytes(Utils.encodeMPI(BigInteger.valueOf(decodeFromOpN(opcode)), false)));
  break;
case OP_NOP:
  break;
case OP_DEPTH:
  stack.add(Utils.reverseBytes(Utils.encodeMPI(BigInteger.valueOf(stack.size()), false)));
  break;
case OP_DROP:
  if (stack.size() < 1)
    throw new ScriptException(ScriptError.SCRIPT_ERR_INVALID_STACK_OPERATION, "Attempted OP_SIZE on an empty stack");
  stack.add(Utils.reverseBytes(Utils.encodeMPI(BigInteger.valueOf(stack.getLast().length), false)));
  break;
case OP_EQUAL:
  stack.add(Utils.reverseBytes(Utils.encodeMPI(numericOPnum, false)));
  break;
case OP_ADD:
  stack.add(Utils.reverseBytes(Utils.encodeMPI(numericOPresult, false)));
  break;
case OP_NUMEQUALVERIFY:

代码示例来源：origin: greenaddress/GreenBits

@Test
public void compactEncoding() throws Exception {
  assertEquals(new BigInteger("1234560000", 16), Utils.decodeCompactBits(0x05123456L));
  assertEquals(new BigInteger("c0de000000", 16), Utils.decodeCompactBits(0x0600c0de));
  assertEquals(0x05123456L, Utils.encodeCompactBits(new BigInteger("1234560000", 16)));
  assertEquals(0x0600c0deL, Utils.encodeCompactBits(new BigInteger("c0de000000", 16)));
}

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