java – Sawtooth无效的批处理或签名
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我最近开始使用Hyperledger Sawtooth进行播放,并且无法在java上提交事务,而python代码似乎没问题.
我已经准备了基于api docs here的python代码,然后尝试在java中编写一个.下面是java中的代码
import com.google.protobuf.ByteString;
import com.mashape.unirest.http.Unirest;
import sawtooth.sdk.processor.Utils;
import sawtooth.sdk.protobuf.*;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.Signature;
import java.security.spec.ECGenParameterSpec;
public class BatchSender {
public static void main(String[] args) throws Exception{
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("EC");
ECGenParameterSpec parameterSpec = new ECGenParameterSpec("secp256k1");
keyPairGenerator.initialize(parameterSpec);
KeyPair keyPair = keyPairGenerator.generateKeyPair();
Signature ecdsaSign = Signature.getInstance("SHA256withECDSA");
ecdsaSign.initSign(keyPair.getPrivate());
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().
setBatcherPubkeyBytes(publicKeyByteString).
setFamilyName("plain_info").
setFamilyVersion("1.0").
addInputs("1cf1266e282c41be5e4254d8820772c5518a2c5a8c0c7f7eda19594a7eb539453e1ed7").
setNonce("1").
addOutputs("1cf1266e282c41be5e4254d8820772c5518a2c5a8c0c7f7eda19594a7eb539453e1ed7").
setPayloadEncoding("application/json").
setPayloadSha512(payloadBytes).
setSignerPubkey(publicKeyHex).build();
ByteString txnHeaderBytes = txnHeader.toByteString();
ecdsaSign.update(txnHeaderBytes.toByteArray());
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();
ecdsaSign.update(batchHeaderBytes.toByteArray());
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 = Unirest.post("http://rest-api:8080/batches").header("Content-Type","application/octet-stream").body(batchBytes.toByteArray()).asString().getBody();
System.out.println(serverResponse);
}
}
一旦我运行它,我得到了
{
"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"
}
}
在码头工日志上,我可以看到
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'
我检查了密钥大小并验证了签名,看起来一切都好,但是,我无法找到为什么批次被拒绝…
以前任何人都有类似的锯齿错误响应？是上面代码的批处理格式还是签名问题？
解决方法:
问题在于设置批头标题和事务标题签名.那些不应该使用sha-512哈希值.这些字节应编码为十六进制字符串.
使用apache-commons-codec库可以完成：
import org.apache.commons.codec.binary.Hex;
Transaction txn = Transaction.newBuilder()
.setHeader(txnHeaderBytes)
.setPayload(payloadByteString)
.setHeaderSignature(Hex.encodeHexString(txnHeaderSignature))
.build();
Utils.sha512应仅用于有效负载字节.
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