hypi-universe/merkletree

Merkle Tree Dart

Updated copy of https://github.com/ethereumdart/merkletree that was itself originally Ported from https://github.com/miguelmota/merkletreejs

Construct a Merkle Tree.

All nodes and leaves are stored as Uint8List. Lonely leaf nodes are promoted to the next level up without being hashed again.

leaves is a list of hashed leaves. Each leaf must be a Uint8List. hashAlgo is a HashAlgo function used for hashing leaves and nodes defined. isBitcoinTree decides whether to construct the MerkleTree using the Bitcoin Merkle Tree implementation. Enable it when you need to replicate Bitcoin constructed Merkle Trees. In Bitcoin Merkle Trees, single nodes are combined with themselves, and each output hash is hashed again.

import 'dart:typed_data';

import 'package:merkletree/hypi_merkletree.dart';
import 'package:pointycastle/pointycastle.dart';

  Uint8List sha256(Uint8List data) {
    var sha256 = Digest('SHA-256');
    return sha256.process(data);
  }
  
  Uint8List sha3(Uint8List data) {
    var sha3 = Digest('SHA-3/256');
    return sha3.process(data);
  }

  var leaves = ['a', 'b', 'c'].map((x) => Uint8List.fromList(x.codeUnits)).map((x) => sha3(x)).toList();
  var tree = MerkleTree(leaves: leaves, hashAlgo: sha256);