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Description:

dart bip32 bip44

BIP32-BIP44 #

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
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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);
...
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Importing a HD private key #
Chain chain = Chain.import("xprv9s21ZrQH143K3QTDL4LXw2F7HEK3wJUD2nW2nRk4stbPy6cq3jPPqjiChkVvvNKmPGJxWUtg6LnF5kejMRNNU3TGtRBeJgk33yuGBxrMPHi");
ExtendedPrivateKey childKey = chain.forPath("m/0/100");
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Importing a HD public key #
Chain chain = Chain.import("xpub661MyMwAqRbcFtXgS5sYJABqqG9YLmC4Q1Rdap9gSE8NqtwybGhePY2gZ29ESFjqJoCu1Rupje8YtGqsefD265TMg7usUDFdp6W1EGMcet8");
ExtendedPublic childKey = chain.forPath("M/0/100");
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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:
dependencies:
dart_bip32_bip44: ^0.2.0
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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.