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Library implementing Bitcoins BIP32 (Hierarchical Deterministic key derivation) specification in a Flutter friendly fashion.

BIP32-BIP44 #

pub package

An implementation of the BIP32 spec for Hierarchical Deterministic Bitcoin addresses. No superimposing wallet structure has been defined. Also supports BIP44 paths such as m/44'/60'/0'/0/0 for Ethereum/Smart Chain

Forked from abandoned repo and updated to work with latest dependencies and null-safety because I need this library for a project

Examples #

You can use this library in two ways; one with a serialized public or private HD key or with a hex encoded seed.

Look at the tests to see more elaborate uses.

With a seed - BIP44 Ethereum web3dart example #

  Chain chain = Chain.seed(hex.encode(utf8.encode("some seed")));
  ExtendedPrivateKey key = chain.forPath("m/44'/60'/0'/0/0");
  Credentials credentials = EthPrivateKey.fromHex(privateKey.privateKeyHex()); //web3dart
  var address = await credentials.extractAddress(); //web3dart

The key has a field called key which contains a BigInt. This is the actual key. For your convenience, you can get it in hex format by calling privateKeyHex(). You can get a seed from a recovery phrase/mnemonic using bip39.

String seed = bip39.mnemonicToSeedHex("word word word word word word word word word word word word");
Chain chain = Chain.seed(seed);  

Importing a HD private key #

  Chain chain = Chain.import("xprv9s21ZrQH143K3QTDL4LXw2F7HEK3wJUD2nW2nRk4stbPy6cq3jPPqjiChkVvvNKmPGJxWUtg6LnF5kejMRNNU3TGtRBeJgk33yuGBxrMPHi");
  ExtendedPrivateKey childKey = chain.forPath("m/0/100");

Importing a HD public key #

  Chain chain = Chain.import("xpub661MyMwAqRbcFtXgS5sYJABqqG9YLmC4Q1Rdap9gSE8NqtwybGhePY2gZ29ESFjqJoCu1Rupje8YtGqsefD265TMg7usUDFdp6W1EGMcet8");
  ExtendedPublic childKey = chain.forPath("M/0/100");

The key has a field called q which contains a ECPoint. This is the actual key.

Please note that trying to generate a private key from a public key will throw an exception.

Exceptions #

There is a tiny chance a child key derivation fails. Please catch the appropriate exceptions in your code.

These exceptions are:

  • KeyZero
  • KeyBiggerThanOrder
  • KeyInfinite

Installing #

Add it to your pubspec.yaml:

  dart_bip32_bip44: ^0.2.0

Licence overview #

All files in this repository fall under the license specified in COPYING. The project is licensed as AGPL with a lesser clause. It may be used within a proprietary project, but the core library and any changes to it must be published online. Source code for this library must always remain free for everybody to access.

Thanks #

Without the guiding code of go-bip32 and money-tree projects this library would have been a significantly bigger struggle.

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Library implementing Bitcoins BIP32 (Hierarchical Deterministic key derivation) specification in a Flutter friendly fashion.

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base58check, convert, flutter, pointycastle


Packages that depend on dart_bip32_bip44