Sawtooth Invalid Batch or Signature

0 votes

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 the python code based on the api docs here and then tried to write one in java as well. Below is the code in java

import com.mashape.unirest.http.Unirest;
import sawtooth.sdk.processor.Utils;
import sawtooth.sdk.protobuf.*;


public class BatchSender {

    public static void main(String[] args) throws Exception{

        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("EC");
        ECGenParameterSpec parameterSpec = new ECGenParameterSpec("secp256k1");


        KeyPair keyPair = keyPairGenerator.generateKeyPair();
        Signature ecdsaSign = Signature.getInstance("SHA256withECDSA");


        byte[] publicKeyBytes = keyPair.getPublic().getEncoded();
        String publicKeyHex = Utils.hash512(publicKeyBytes);

        ByteString publicKeyByteString = ByteString.copyFrom(new String(publicKeyBytes),"UTF-8");

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

        ByteString payloadByteString  = ByteString.copyFrom(payload.getBytes());

        TransactionHeader txnHeader = TransactionHeader.newBuilder().

        ByteString txnHeaderBytes = txnHeader.toByteString();
        byte[] txnHeaderSignature = ecdsaSign.sign();

        Transaction txn = Transaction.newBuilder().setHeader(txnHeaderBytes).setPayload(payloadByteString).setHeaderSignature(Utils.hash512(txnHeaderSignature)).build();

        BatchHeader batchHeader = BatchHeader.newBuilder().setSignerPubkey(publicKeyHex).addTransactionIds(txn.getHeaderSignature()).build();

        ByteString batchHeaderBytes = batchHeader.toByteString();


        byte[] batchHeaderSignature = ecdsaSign.sign();

        Batch batch = Batch.newBuilder().setHeader(batchHeaderBytes).setHeaderSignature(Utils.hash512(batchHeaderSignature)).addTransactions(txn).build();

        BatchList batchList = BatchList.newBuilder().addBatches( batch).build();

        ByteString batchBytes = batchList.toByteString();

        String serverResponse ="http://rest-api:8080/batches").header("Content-Type","application/octet-stream").body(batchBytes.toByteArray()).asString().getBody();



Once I run it, I am getting

  "error": {
    "code": 30,
    "message": "The submitted BatchList was rejected by the validator. It was poorly formed, or has an invalid signature.",
    "title": "Submitted Batches Invalid"

On the dockers logs, I can see

sawtooth-validator-default | [2017-11-21 08:20:09.842 DEBUG    interconnect] ServerThread receiving CLIENT_BATCH_SUBMIT_REQUEST message: 1242 bytes
sawtooth-validator-default | [2017-11-21 08:20:09.844 DEBUG    signature_verifier] batch failed signature validation: 30a2f4a24be3e624f5a35b17cb505b65cb8dd41600545c6dcfac7534205091552e171082922d4eb71f1bb186fe49163f349c604b631f64fa8f1cfea1c8bb2818
sawtooth-validator-default | [2017-11-21 08:20:09.844 DEBUG    interconnect] ServerThread sending CLIENT_BATCH_SUBMIT_RESPONSE to b'50b094689ac14b39'

I have checked the key sizes and verify the signature, and it seems all ok, however, i couldnt find why the batch is rejected...

Anyone had similar error response from sawtooth before? is it the batch format or still signature issue for the code above?

Jun 16, 2018 in Blockchain by ariaholic
• 7,320 points

1 answer to this question.

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0 votes

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()

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

answered Jun 16, 2018 by charlie_brown
• 7,710 points

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