Esempio n. 1
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  public byte[] getProofHash() {
    if (this.version < 3) {
      return Crypto.getInstance().digest(this.generatorSignature);
    } else {
      // newSig = sha256(prevSig || pubKey)
      byte[] data = Bytes.concat(this.reference, generator.getPublicKey());

      return Crypto.getInstance().digest(data);
    }
  }
Esempio n. 2
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  public boolean isSignatureValid() {
    // VALIDATE BLOCK SIGNATURE
    byte[] data = new byte[0];

    // WRITE PARENT GENERATOR SIGNATURE
    byte[] generatorSignature = Arrays.copyOfRange(this.reference, 0, GENERATOR_SIGNATURE_LENGTH);
    data = Bytes.concat(data, generatorSignature);

    // WRITE GENERATING BALANCE
    byte[] baseTargetBytes = Longs.toByteArray(this.generatingBalance);
    data = Bytes.concat(data, baseTargetBytes);

    // WRITE GENERATOR
    byte[] generatorBytes =
        Bytes.ensureCapacity(this.generator.getPublicKey(), GENERATOR_LENGTH, 0);
    data = Bytes.concat(data, generatorBytes);

    if (!Crypto.getInstance()
        .verify(this.generator.getPublicKey(), this.generatorSignature, data)) {
      return false;
    }

    // VALIDATE TRANSACTIONS SIGNATURE
    data = this.generatorSignature;
    for (Transaction transaction : this.getTransactions()) {
      // CHECK IF TRANSACTION SIGNATURE IS VALID
      if (!transaction.isSignatureValid()) {
        return false;
      }

      // ADD SIGNATURE TO DATA
      data = Bytes.concat(data, transaction.getSignature());
    }

    if (!Crypto.getInstance()
        .verify(this.generator.getPublicKey(), this.transactionsSignature, data)) {
      return false;
    }

    return true;
  }
Esempio n. 3
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  @Test
  public void orphanBlock() {
    // CREATE EMPTY MEMORY DATABASE
    DBSet databaseSet = DBSet.createEmptyDatabaseSet();

    // PROCESS GENESISBLOCK
    GenesisBlock genesisBlock = new GenesisBlock();
    genesisBlock.process(databaseSet);

    // CREATE KNOWN ACCOUNT
    byte[] seed = Crypto.getInstance().digest("test".getBytes());
    byte[] privateKey = Crypto.getInstance().createKeyPair(seed).getA();
    PrivateKeyAccount generator = new PrivateKeyAccount(privateKey);

    // PROCESS GENESIS TRANSACTION TO MAKE SURE GENERATOR HAS FUNDS
    Transaction transaction =
        new GenesisTransaction(generator, BigDecimal.valueOf(1000).setScale(8), NTP.getTime());
    transaction.process(databaseSet);

    // GENERATE NEXT BLOCK
    BlockGenerator blockGenerator = new BlockGenerator();
    Block block = blockGenerator.generateNextBlock(databaseSet, generator, genesisBlock);

    // FORK
    DBSet fork = databaseSet.fork();

    // GENERATE PAYMENT 1
    Account recipient = new Account("XUi2oga2pnGNcZ9es6pBqxydtRZKWdkL2g");
    long timestamp = block.getTimestamp();
    byte[] signature =
        PaymentTransaction.generateSignature(
            databaseSet,
            generator,
            recipient,
            BigDecimal.valueOf(100).setScale(8),
            BigDecimal.valueOf(1).setScale(8),
            timestamp);
    Transaction payment1 =
        new PaymentTransaction(
            generator,
            recipient,
            BigDecimal.valueOf(100).setScale(8),
            BigDecimal.valueOf(1).setScale(8),
            timestamp,
            generator.getLastReference(databaseSet),
            signature);
    payment1.process(fork);
    block.addTransaction(payment1);

    // GENERATE PAYMENT 2
    Account recipient2 = new Account("XLPYYfxKEiDcybCkFA7jXcxSdePMMoyZLt");
    signature =
        PaymentTransaction.generateSignature(
            fork,
            generator,
            recipient2,
            BigDecimal.valueOf(100).setScale(8),
            BigDecimal.valueOf(1).setScale(8),
            timestamp);
    Transaction payment2 =
        new PaymentTransaction(
            generator,
            recipient2,
            BigDecimal.valueOf(100).setScale(8),
            BigDecimal.valueOf(1).setScale(8),
            timestamp,
            generator.getLastReference(fork),
            signature);
    block.addTransaction(payment2);

    // ADD TRANSACTION SIGNATURE
    byte[] transactionsSignature = blockGenerator.calculateTransactionsSignature(block, generator);
    block.setTransactionsSignature(transactionsSignature);

    // CHECK VALID
    assertEquals(true, block.isSignatureValid());
    assertEquals(true, block.isValid(databaseSet));

    // PROCESS BLOCK
    block.process(databaseSet);

    // ORPHAN BLOCK
    block.orphan(databaseSet);

    // CHECK BALANCE GENERATOR
    assertEquals(
        true, generator.getConfirmedBalance(databaseSet).compareTo(BigDecimal.valueOf(1000)) == 0);

    // CHECK LAST REFERENCE GENERATOR
    assertEquals(
        true, Arrays.equals(generator.getLastReference(databaseSet), transaction.getSignature()));

    // CHECK BALANCE RECIPIENT
    assertEquals(
        true, recipient.getConfirmedBalance(databaseSet).compareTo(BigDecimal.valueOf(1000)) == 0);

    // CHECK LAST REFERENCE RECIPIENT
    assertEquals(
        false, Arrays.equals(recipient.getLastReference(databaseSet), payment1.getSignature()));

    // CHECK BALANCE RECIPIENT2
    assertEquals(
        true, recipient2.getConfirmedBalance(databaseSet).compareTo(BigDecimal.valueOf(0)) == 0);

    // CHECK LAST REFERENCE RECIPIENT
    assertEquals(true, Arrays.equals(recipient2.getLastReference(databaseSet), new byte[0]));

    // CHECK LAST BLOCK
    assertEquals(
        true,
        Arrays.equals(
            genesisBlock.getSignature(), databaseSet.getBlockMap().getLastBlock().getSignature()));
  }
Esempio n. 4
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  @Test
  public void parseBlock() {
    // CREATE EMPTY MEMORY DATABASE
    DBSet databaseSet = DBSet.createEmptyDatabaseSet();

    // PROCESS GENESISBLOCK
    GenesisBlock genesisBlock = new GenesisBlock();
    genesisBlock.process(databaseSet);

    // CREATE KNOWN ACCOUNT
    byte[] seed = Crypto.getInstance().digest("test".getBytes());
    byte[] privateKey = Crypto.getInstance().createKeyPair(seed).getA();
    PrivateKeyAccount generator = new PrivateKeyAccount(privateKey);

    // PROCESS GENESIS TRANSACTION TO MAKE SURE GENERATOR HAS FUNDS
    Transaction transaction =
        new GenesisTransaction(generator, BigDecimal.valueOf(1000).setScale(8), NTP.getTime());
    transaction.process(databaseSet);

    // GENERATE NEXT BLOCK
    BlockGenerator blockGenerator = new BlockGenerator();
    Block block = blockGenerator.generateNextBlock(databaseSet, generator, genesisBlock);

    // FORK
    DBSet fork = databaseSet.fork();

    // GENERATE PAYMENT 1
    Account recipient = new Account("XUi2oga2pnGNcZ9es6pBqxydtRZKWdkL2g");
    long timestamp = block.getTimestamp();
    byte[] signature =
        PaymentTransaction.generateSignature(
            databaseSet,
            generator,
            recipient,
            BigDecimal.valueOf(100).setScale(8),
            BigDecimal.valueOf(1).setScale(8),
            timestamp);
    Transaction payment1 =
        new PaymentTransaction(
            generator,
            recipient,
            BigDecimal.valueOf(100).setScale(8),
            BigDecimal.valueOf(1).setScale(8),
            timestamp,
            generator.getLastReference(databaseSet),
            signature);
    payment1.process(fork);
    block.addTransaction(payment1);

    // GENERATE PAYMENT 2
    Account recipient2 = new Account("XLPYYfxKEiDcybCkFA7jXcxSdePMMoyZLt");
    signature =
        PaymentTransaction.generateSignature(
            fork,
            generator,
            recipient2,
            BigDecimal.valueOf(100).setScale(8),
            BigDecimal.valueOf(1).setScale(8),
            timestamp);
    Transaction payment2 =
        new PaymentTransaction(
            generator,
            recipient2,
            BigDecimal.valueOf(100).setScale(8),
            BigDecimal.valueOf(1).setScale(8),
            timestamp,
            generator.getLastReference(fork),
            signature);
    block.addTransaction(payment2);

    // ADD TRANSACTION SIGNATURE
    byte[] transactionsSignature =
        Crypto.getInstance().sign(generator, block.getGeneratorSignature());
    block.setTransactionsSignature(transactionsSignature);

    // CONVERT TO BYTES
    byte[] rawBlock = block.toBytes();

    try {
      // PARSE FROM BYTES
      Block parsedBlock = BlockFactory.getInstance().parse(rawBlock);

      // CHECK INSTANCE
      assertEquals(false, parsedBlock instanceof GenesisBlock);

      // CHECK SIGNATURE
      assertEquals(true, Arrays.equals(block.getSignature(), parsedBlock.getSignature()));

      // CHECK GENERATOR
      assertEquals(block.getGenerator().getAddress(), parsedBlock.getGenerator().getAddress());

      // CHECK BASE TARGET
      assertEquals(block.getGeneratingBalance(), parsedBlock.getGeneratingBalance());

      // CHECK FEE
      assertEquals(block.getTotalFee(), parsedBlock.getTotalFee());

      // CHECK REFERENCE
      assertEquals(true, Arrays.equals(block.getReference(), parsedBlock.getReference()));

      // CHECK TIMESTAMP
      assertEquals(block.getTimestamp(), parsedBlock.getTimestamp());

      // CHECK TRANSACTIONS COUNT
      assertEquals(block.getTransactionCount(), parsedBlock.getTransactionCount());
    } catch (Exception e) {
      fail("Exception while parsing transaction.");
    }

    // PARSE TRANSACTION FROM WRONG BYTES
    rawBlock = new byte[50];

    try {
      // PARSE FROM BYTES
      BlockFactory.getInstance().parse(rawBlock);

      // FAIL
      fail("this should throw an exception");
    } catch (Exception e) {
      // EXCEPTION IS THROWN OKE
    }
  }
Esempio n. 5
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  @Test
  public void validateBlock() {
    // CREATE EMPTY MEMORY DATABASE
    DBSet databaseSet = DBSet.createEmptyDatabaseSet();

    // PROCESS GENESISBLOCK
    GenesisBlock genesisBlock = new GenesisBlock();
    genesisBlock.process(databaseSet);

    // CREATE KNOWN ACCOUNT
    byte[] seed = Crypto.getInstance().digest("test".getBytes());
    byte[] privateKey = Crypto.getInstance().createKeyPair(seed).getA();
    PrivateKeyAccount generator = new PrivateKeyAccount(privateKey);

    // PROCESS GENESIS TRANSACTION TO MAKE SURE GENERATOR HAS FUNDS
    Transaction transaction =
        new GenesisTransaction(generator, BigDecimal.valueOf(1000).setScale(8), NTP.getTime());
    transaction.process(databaseSet);

    // GENERATE NEXT BLOCK
    BlockGenerator blockGenerator = new BlockGenerator();
    Block newBlock = blockGenerator.generateNextBlock(databaseSet, generator, genesisBlock);

    // ADD TRANSACTION SIGNATURE
    byte[] transactionsSignature =
        Crypto.getInstance().sign(generator, newBlock.getGeneratorSignature());
    newBlock.setTransactionsSignature(transactionsSignature);

    // CHECK IF VALID
    assertEquals(true, newBlock.isValid(databaseSet));

    // CHANGE REFERENCE
    Block invalidBlock =
        BlockFactory.getInstance()
            .create(
                newBlock.getVersion(),
                new byte[128],
                newBlock.getTimestamp(),
                newBlock.getGeneratingBalance(),
                newBlock.getGenerator(),
                newBlock.getGeneratorSignature());

    // CHECK IF INVALID
    assertEquals(false, invalidBlock.isValid(databaseSet));

    // CHANGE TIMESTAMP
    invalidBlock =
        BlockFactory.getInstance()
            .create(
                newBlock.getVersion(),
                newBlock.getReference(),
                1L,
                newBlock.getGeneratingBalance(),
                newBlock.getGenerator(),
                newBlock.getGeneratorSignature());

    // CHECK IF INVALID
    assertEquals(false, invalidBlock.isValid(databaseSet));

    // CHANGE BASETARGET
    invalidBlock =
        BlockFactory.getInstance()
            .create(
                newBlock.getVersion(),
                newBlock.getReference(),
                newBlock.getTimestamp(),
                1L,
                newBlock.getGenerator(),
                newBlock.getGeneratorSignature());

    // CHECK IF INVALID
    assertEquals(false, invalidBlock.isValid(databaseSet));

    // ADD INVALID TRANSACTION
    invalidBlock = blockGenerator.generateNextBlock(databaseSet, generator, genesisBlock);
    Account recipient = new Account("XUi2oga2pnGNcZ9es6pBqxydtRZKWdkL2g");
    long timestamp = newBlock.getTimestamp();
    byte[] signature =
        PaymentTransaction.generateSignature(
            databaseSet,
            generator,
            recipient,
            BigDecimal.valueOf(-100).setScale(8),
            BigDecimal.valueOf(1).setScale(8),
            timestamp);
    Transaction payment =
        new PaymentTransaction(
            generator,
            recipient,
            BigDecimal.valueOf(-100).setScale(8),
            BigDecimal.valueOf(1).setScale(8),
            timestamp,
            generator.getLastReference(databaseSet),
            signature);
    invalidBlock.addTransaction(payment);

    // CHECK IF INVALID
    assertEquals(false, invalidBlock.isValid(databaseSet));

    // ADD GENESIS TRANSACTION
    invalidBlock = blockGenerator.generateNextBlock(databaseSet, generator, genesisBlock);
    transaction =
        new GenesisTransaction(
            generator, BigDecimal.valueOf(1000).setScale(8), newBlock.getTimestamp());
    invalidBlock.addTransaction(transaction);

    // CHECK IF INVALID
    assertEquals(false, invalidBlock.isValid(databaseSet));
  }