Ethereum Util for Dart 👋 #

A collection of utility functions for Ethereum and other blockchains, ported from JavaScript to Dart. This library is a work in progress and aims to provide a comprehensive set of tools for Dart developers working with Ethereum.

Features ✨ #

• Sign EIP-1559 and legacy transactions
• RLP encoding and decoding
• Ethereum address and public key utilities
• Hashing functions (keccak256, sha256)
• Signature utilities (ecrecover, toRpcSig)
• Typed data signing (EIP-712)
• Support for other coins like Polkadot (DOT), Sui (SUI), and Ripple (XRP)

Installation 📦 #

Add this to your pubspec.yaml:

dependencies:
  ethereum_util: ^1.5.1

Then run pub get or flutter pub get.

Usage 🚀 #

Sign an EIP-1559 Transaction #

import 'dart:typed_data';
import 'package:convert/convert.dart';
import 'package:ethereum_util/src/eip1559Transaction.dart';

void main() {
  final txData = TxData(
    nonce: 1,
    maxPriorityFeePerGas: 10000,
    maxFeePerGas: 1000000,
    gasLimit: 21000,
    to: '0xfd79200d598a5a875ea30f0b4172aa525caaba53',
    value: 1000000000,
  );

  // Match the network. e.g. Mainnet: 1, Ropsten: 3.
  final txNetwork = TxNetwork(chainId: 3);

  final tx = Eip1559Transaction(txData, txNetwork);

  // Sign with your private key.
  // final privateKey = ...;
  // final result = tx.sign(privateKey);
  // print(hex.encode(result));
}

Sign a Legacy Transaction #

import 'dart:typed_data';
import 'package:ethereum_util/src/legacyTransaction.dart';

void main() {
  final txData = TxData(
    nonce: 46,
    gasPrice: 5000000000,
    gasLimit: 21000,
    to: '0x7fD1aA2b64d8ACfC85be1eA2DaF535f8821D0B6a',
    value: 1000000000000000,
  );

  // Match the network. e.g. Mainnet: 1, Ropsten: 3, BSC: 56.
  final txNetwork = TxNetwork(chainId: 56);

  final tx = LegacyTransaction(txData, txNetwork);

  // Sign with your private key.
  // final privateKey = ...;
  // final result = tx.sign(Uint8List.fromList(privateKey));
}

For more examples, please check the test directory.

Testing 🧪 #

To run the tests for this package, use the following command:

dart test

Contributing 🤝 #

Contributions are welcome! Please feel free to open an issue or submit a pull request on our GitHub repository.

License 📝 #

This project is licensed under the MIT License - see the LICENSE file for details.