nova 0.0.1+2

A library to generate eth wallets, sign transaction, and send them. It also implements part of the Ethereum JSON-RPC API specification.

Nova

Nova can be used to generate eth wallets, sign transaction, and send them. It also implements some cryptographic functions, convenient types conversion extensions, and part of the Ethereum JSON-RPC API specification.

Account

The library has built-in support for managing ethereum private keys, and signatures. It provides functionality for generating, signing, and sending transactions.

Generate a Account

Generate a new account with a seed phrase

import "package:nova/nova.dart";

void main() {
  // Generate a seed phrase
  final seedPhrase = Cryptography.generateMnemonic();

  // Derive a private key from the seed phrase
  final privateKey = Cryptography.derivePrivateKey(seedPhrase);
  
  // Instantiate an Account object to sign and send transactions
  final account = Account(privateKey, "ws://your-websocket.com");
}

Use your own seed phrase or private key

Load an Account with a seed phrase

import "package:nova/nova.dart";

void main() {
  // Your seed phrase
  final seedPhrase = "seed sock milk update focus rotate barely fade car face mechanic mercy"

  // The seed phrase private key
  final privateKey = Cryptography.derivePrivateKey(seedPhrase);
  
  // Instantiate an Account object to sign and send transactions
  final account = Account(privateKey, "ws://your-websocket.com");
}

Sign a Transaction

Generate a signed transaction

import 'dart:math';
import "package:nova/nova.dart";

void main() async {
  final account = Account(
    "0x4646464646464646464646464646464646464646464646464646464646464646",
    "ws://xyz.com",
  );

  final signedTransaction = await account.sign(
    nonce: BigInt.from(9),
    to: "0x3535353535353535353535353535353535353535",
    gasLimit: BigInt.from(21000),
    gasPrice: BigInt.from(20 * pow(10, 9)),
    value: BigInt.from(pow(10, 18)),
    chainId: 1,
  );
}

Send a Transaction

Sign and send a transaction.

import 'dart:math';
import "package:nova/nova.dart";

void main() async {
   final account = Account(
    "0x4646464646464646464646464646464646464646464646464646464646464646",
    "ws://xyz.com",
  );

  final signedTransaction = await account.send(
    nonce: BigInt.from(9),
    to: "0x3535353535353535353535353535353535353535",
    gasLimit: BigInt.from(21000),
    gasPrice: BigInt.from(20 * pow(10, 9)),
    value: BigInt.from(pow(10, 18)),
    chainId: 1,
  );
}

Cryptography

Convenient wrapper around pointycastle to make it easier to use.

Get the keccak256 of any data

Get the keccak256 of any bytes data

import "package:nova/nova.dart";

void main() {
  final data = "your-data";
  Cryptography.keccak(data.bytes());
}

Sign any data

Sign any string data with a private key

import "package:nova/nova.dart";

void main() {
  final privateKey = "0x4646464646464646464646464646464646464646464646464646464646464646";
  final data = "your-data";
  Cryptography.sign(privateKey, data);
}

Extensions

Convenient dart extensions to make life easier

Quickly convert between different types

import "package:nova/nova.dart";

void main() {
    final privateKey = "0x4646464646464646464646464646464646464646464646464646464646464646";
    print(privateKey.bigInt());
    // 31786063712204445802548897845522170783250584025862115618674630904133015979590
    print(privateKey.bytes());
    // [52, 54, 52, 54, 52, 54, ..., 54]

    final privateKeyBigInt = BigInt.from(42);
    print(privateKeyBigInt.bytes());
    // [16, 146]

    final privateKeyBytes = Uint8List.fromList([16, 146]);
    print(privateKeyBytes.bigInt());
    // 4242
}

Validate a hex string

import "package:nova/nova.dart";

void main() {
    final privateKeyA = "0x4646464646464646464646464646464646464646464646464646464646464646";
    print(privateKeyA.isValidHex());
    // true

   final privateKeyB = "902MIsam)pp";
    print(privateKeyB.isValidHex());
    // false
}

Communicate with an Ethereum Node with Json RPC

The library facilitates communication with an Ethereum node, such as Geth or Parity, using the JSON-RPC protocol. Currently only part of the specification is implemented.

Function
eth_protocolVersion	✅
eth_syncing
eth_coinbase
eth_mining
eth_hashrate
eth_gasPrice	✅
eth_accounts
eth_blockNumber	✅
eth_getBalance	✅
eth_getStorageAt
eth_getTransactionCount	✅
eth_getBlockTransactionCountByHash
eth_getBlockTransactionCountByNumber
eth_getUncleCountByBlockHash
eth_getUncleCountByBlockNumber
eth_getCode
eth_sign	✅
eth_signTransaction
eth_sendTransaction	✅
eth_sendRawTransaction	✅
eth_call	✅
eth_estimateGas	✅
eth_getBlockByHash	✅
eth_getBlockByNumber	✅
eth_getTransactionByHash
eth_getTransactionByBlockHashAndIndex
eth_getTransactionByBlockNumberAndIndex
eth_getTransactionReceipt
eth_getUncleByBlockHashAndIndex
eth_getUncleByBlockNumberAndIndex
eth_getCompilers
eth_newFilter
eth_newBlockFilter
eth_newPendingTransactionFilter
eth_uninstallFilter
eth_getFilterChanges
eth_getFilterLogs
eth_getLogs
eth_getWork
eth_submitWork
eth_submitHashrate