Sawtooth Invalid Batch or Signature

Question

I have started playing atound with Hyperledger Sawtooth recently, and having trouble to submit transactions on java, while python code seems okay.

I have prepared t

Answer 1

I've just have the same issue. In my case the problem was in setting payload data.

Be sure that:

• You made a sha512 hash of your PayloadByteArray and pass it to TransactionHeader creation
• You pass PayloadByteArray to transaction creation.

So:

• PayloadByteArray -> Transaction creation
• sha512 Hash of PayloadByteArray -> TransactionHeader creation

Answer 2

The Sawtooth Java SDK comes with a Signing class that can be helpful in generating private/public key pairs and signing messages.

I have modified your code to use the specified class and included the changes from Boyd Johnson's answer for a working example (this is using Sawtooth Java SDK version 1.0):

import com.google.protobuf.ByteString;
import com.mashape.unirest.http.Unirest;
import com.mashape.unirest.http.exceptions.UnirestException;
import org.bitcoinj.core.ECKey;
import sawtooth.sdk.client.Signing;
import sawtooth.sdk.processor.Utils;
import sawtooth.sdk.protobuf.Batch;
import sawtooth.sdk.protobuf.BatchHeader;
import sawtooth.sdk.protobuf.BatchList;
import sawtooth.sdk.protobuf.Transaction;
import sawtooth.sdk.protobuf.TransactionHeader;

import java.security.SecureRandom;

public class BatchSender {

  public static void main(String []args) throws UnirestException {
    ECKey privateKey = Signing.generatePrivateKey(new SecureRandom());
    String publicKey = Signing.getPublicKey(privateKey);

    ByteString publicKeyByteString = ByteString.copyFromUtf8(publicKey);

    String payload = "{'key':1, 'value':'value comes here'}";
    String payloadBytes = Utils.hash512(payload.getBytes());
    ByteString payloadByteString  = ByteString.copyFrom(payload.getBytes());

    TransactionHeader txnHeader = TransactionHeader.newBuilder()
            .setBatcherPublicKeyBytes(publicKeyByteString)
            .setSignerPublicKeyBytes(publicKeyByteString)
            .setFamilyName("plain_info")
            .setFamilyVersion("1.0")
            .addInputs("1cf1266e282c41be5e4254d8820772c5518a2c5a8c0c7f7eda19594a7eb539453e1ed7")
            .setNonce("1")
            .addOutputs("1cf1266e282c41be5e4254d8820772c5518a2c5a8c0c7f7eda19594a7eb539453e1ed7")
            .setPayloadSha512(payloadBytes)
            .setSignerPublicKey(publicKey)
            .build();
    ByteString txnHeaderBytes = txnHeader.toByteString();
    String txnHeaderSignature = Signing.sign(privateKey, txnHeaderBytes.toByteArray());

    Transaction txn = Transaction.newBuilder()
            .setHeader(txnHeaderBytes)
            .setPayload(payloadByteString)
            .setHeaderSignature(txnHeaderSignature)
            .build();

    BatchHeader batchHeader = BatchHeader.newBuilder()
            .setSignerPublicKey(publicKey)
            .addTransactionIds(txn.getHeaderSignature())
            .build();
    ByteString batchHeaderBytes = batchHeader.toByteString();
    String batchHeaderSignature = Signing.sign(privateKey, batchHeaderBytes.toByteArray());

    Batch batch = Batch.newBuilder()
            .setHeader(batchHeaderBytes)
            .setHeaderSignature(batchHeaderSignature)
            .addTransactions(txn)
            .build();

    BatchList batchList = BatchList.newBuilder()
            .addBatches(batch)
            .build();
    ByteString batchBytes = batchList.toByteString();

    String serverResponse =  Unirest.post("http://localhost:8008/batches")
            .header("Content-Type","application/octet-stream")
            .body(batchBytes.toByteArray())
            .asString()
            .getBody();

    System.out.println(serverResponse);
  }
}

Answer 3

The problem is in setting the batch header signature and the transaction header signature. Those should not have the sha-512 hash taken of them. Those bytes should be encoded as hex strings.

Using the apache-commons-codec library that can be done as:

import org.apache.commons.codec.binary.Hex;

Transaction txn = Transaction.newBuilder()
                      .setHeader(txnHeaderBytes)
                      .setPayload(payloadByteString)
                      .setHeaderSignature(Hex.encodeHexString(txnHeaderSignature))
                    .build();

The Utils.sha512 should only be used on the payload bytes.