怎么实现JAVA离线签名

本篇内容介绍了"怎么实现JAVA离线签名"的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！

源码

import com.alibaba.fastjson.JSON;import com.google.protobuf.Any;import com.google.protobuf.ByteString;import com.google.protobuf.InvalidProtocolBufferException;import java.util.Map;import org.bouncycastle.util.encoders.Hex;import org.tron.common.crypto.ECKey;import org.tron.common.crypto.Sha256Hash;import org.tron.common.utils.ByteArray;import org.tron.core.exception.CancelException;import org.tron.protos.Contract;import org.tron.protos.Protocol.Block;import org.tron.protos.Protocol.Transaction;import org.tron.walletserver.WalletApi;public class TransactionSignDemo {        public static Transaction createTransaction(byte[] from, byte[] to, long amount,long blockTimestamp,long blockHeight,byte[] blockHash) {                Transaction.Builder transactionBuilder = Transaction.newBuilder();                //Block newestBlock = WalletApi.getBlock(-1);                                Transaction.Contract.Builder contractBuilder = Transaction.Contract.newBuilder();                Contract.TransferContract.Builder transferContractBuilder = Contract.TransferContract.newBuilder();                transferContractBuilder.setAmount(amount);                ByteString bsTo = ByteString.copyFrom(to);                ByteString bsOwner = ByteString.copyFrom(from);                transferContractBuilder.setToAddress(bsTo);                transferContractBuilder.setOwnerAddress(bsOwner);                try {                        Any any = Any.pack(transferContractBuilder.build());                        contractBuilder.setParameter(any);                } catch (Exception e) {                        return null;                }                contractBuilder.setType(Transaction.Contract.ContractType.TransferContract);                transactionBuilder.getRawDataBuilder().addContract(contractBuilder).setTimestamp(System.currentTimeMillis())                                .setExpiration(blockTimestamp + 10 * 60 * 60 * 1000);                Transaction transaction = transactionBuilder.build();                Transaction refTransaction = setReference(transaction, blockHeight,blockHash);                return refTransaction;        }                public static Transaction setReference(Transaction transaction, long blockHeight,byte[] blockHash) {                //long blockHeight = newestBlock.getBlockHeader().getRawData().getNumber();                //byte[] blockHash = getBlockHash(newestBlock).getBytes();                byte[] refBlockNum = ByteArray.fromLong(blockHeight);                Transaction.raw rawData = transaction.getRawData().toBuilder()                                .setRefBlockHash(ByteString.copyFrom(ByteArray.subArray(blockHash, 8, 16)))                                .setRefBlockBytes(ByteString.copyFrom(ByteArray.subArray(refBlockNum, 6, 8))).build();                return transaction.toBuilder().setRawData(rawData).build();        }                public static Sha256Hash getBlockHash(Block block) {                return Sha256Hash.of(block.getBlockHeader().getRawData().toByteArray());        }        public static String getTransactionHash(Transaction transaction) {                String txid = ByteArray.toHexString(Sha256Hash.hash(transaction.getRawData().toByteArray()));                return txid;        }        private static byte[] signTransaction2Byte(byte[] transaction, byte[] privateKey)                        throws InvalidProtocolBufferException {                ECKey ecKey = ECKey.fromPrivate(privateKey);                Transaction transaction1 = Transaction.parseFrom(transaction);                byte[] rawdata = transaction1.getRawData().toByteArray();                byte[] hash = Sha256Hash.hash(rawdata);                byte[] sign = ecKey.sign(hash).toByteArray();                return transaction1.toBuilder().addSignature(ByteString.copyFrom(sign)).build().toByteArray();        }        public static void main(String[] args) throws InvalidProtocolBufferException, CancelException {                String privateStr = "你的私钥";                byte[] privateBytes = ByteArray.fromHexString(privateStr);                ECKey ecKey = ECKey.fromPrivate(privateBytes);                byte[] from = ecKey.getAddress();                byte[] to = WalletApi.decodeFromBase58Check("地址");                long amount = 100_000_000L;                                 String blockStr = HttpUtil.get("https://apilist.tronscan.org/api/block/latest");                Map blockInfo=JSON.parseObject(blockStr);                System.out.println(blockInfo.toString());                Long blockTimestamp = Long.parseLong(blockInfo.get("timestamp").toString());                Long blockHeight = Long.parseLong(blockInfo.get("number").toString());                                byte[] blockHash = Hex.decode(blockInfo.get("hash").toString());                //开始看官方demo改写的blockHashd，但是错的，签名没的问题，但是广播就报错TAPOS_ERROR，说块不在链上。                    byte[] blockHash3=Sha256Hash.of(blockInfo.get("hash").toString().getBytes()).getBytes();                System.out.println("===blockHash:"+ByteArray.toHexString(blockHash));                System.out.println("===blockHash3:"+ByteArray.toHexString(blockHash3));                                Transaction transaction = createTransaction(from, to, amount, blockTimestamp, blockHeight, blockHash);                byte[] transactionBytes = transaction.toByteArray();                byte[] transaction4 = signTransaction2Byte(transactionBytes, privateBytes);                System.out.println("transaction4 ::::: " + ByteArray.toHexString(transaction4));                                //广播的URL:https://apilist.tronscan.org/api/broadcast        }}

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