rlp

The purpose of RLP (Recursive Length Prefix) is to encode arbitrarily nested arrays of binary data, and RLP is the main encoding method used to serialize objects in Ethereum

rlp takes a String, int, BigInt or List and returns an RLP encoded Uint8List. The repository also provies an additional functionality of decoder which decodes the given rlp Uint8List.

Usage

A simple usage example:

import 'package:rlp/rlp.dart';

main() {
  var encoded = Rlp.encode(["dog", "cat"]);
  print(encoded); // Uint8List [200, 131, 100, 111, 103, 131, 99, 97, 116]
  
  var decoded = Rlp.decode(Uint8List.fromList([131, 100, 111, 103]));
  print(ascii.decode(decodedStr.cast())) // dog
}

A more complex usage example:

import 'package:convert/convert.dart';
import 'package:pointycastle/digests/keccak.dart';
import 'package:rlp/rlp.dart';

main() {

  var sender = Address('0xba52c75764d6f594735dc735be7f1830cdf58ddf');
  var nonce = 3515;

  var encoded = Rlp.encode([sender, nonce]);

  var out = KeccakDigest(256).process(encoded);
  var contractAddress = hex.encode(out.sublist(12));

  print('Cryptokitties contract address is 0x$contractAddress'); // 0x06012c8cf97bead5deae237070f9587f8e7a266d

}

Features and bugs

Please file feature requests and bugs at the issue tracker.