签名TRON交易

dependencies:
  crypto: ^3.0.0
  pointycastle: ^3.4.0

import 'dart:convert';
import 'package:crypto/crypto.dart';
import 'package:pointycastle/export.dart';
import 'package:pointycastle/api.dart' show PrivateKeyParameter;
import 'dart:typed_data';

Uint8List generateHash(String message) {
  // 将消息字符串转换为字节数据
  var bytes = utf8.encode(message);
  // 生成SHA-256哈希
  var digest = sha256.convert(bytes);
  return Uint8List.fromList(digest.bytes);
}

Uint8List signTransaction(Uint8List messageHash, Uint8List privateKeyBytes) {
  // 创建ECDSA签名对象，使用SECP256k1曲线
  var signer = Signer("SHA-256/ECDSA");
  var keyParams = PrivateKeyParameter<ECPrivateKey>(ECPrivateKey(
    BigInt.parse(privateKeyBytes.toList().map((byte) => byte.toRadixString(16)).join(), radix: 16),
    ECDomainParameters("secp256k1"),
  ));
  // 初始化签名对象
  signer.init(true, keyParams);
  // 执行签名操作
  ECSignature signature = signer.generateSignature(messageHash) as ECSignature;
  // 将签名转换为Uint8List格式
  var r = signature.r.toRadixString(16).padLeft(64, '0');
  var s = signature.s.toRadixString(16).padLeft(64, '0');
  return Uint8List.fromList((r + s).codeUnits);
}

void main() {
  String message = '{"from":"address1","to":"address2","amount":100}';
  // 示例私钥：假设为32字节的十六进制字符串
  String privateKeyHex = "your_private_key_in_hex";
  var privateKeyBytes = Uint8List.fromList(hex.decode(privateKeyHex));

  // 1. 生成消息的哈希
  Uint8List messageHash = generateHash(message);

  // 2. 使用私钥对哈希进行签名
  Uint8List signature = signTransaction(messageHash, privateKeyBytes);

  // 输出签名
  print("Signature: ${signature.map((e) => e.toRadixString(16).padLeft(2, '0')).join()}");
}