hd-key

Bitcoin BIP32 hierarchical deterministic keys Typescript implemention.

Installing / Getting started

npm install --save hd-key

Basic Usage

HDKey.fromMasterSeed(seedBuffer[, masterSecret, versions])

const seed =
  'a0c42a9c3ac6abf2ba6a9946ae83af18f51bf1c9fa7dacc4c92513cc4dd015834341c775dcd4c0fac73547c5662d81a9e9361a0aac604a73a321bd9103bce8af'
const hdkey = HDKey.fromMasterSeed(Buffer.from(seed, 'hex'))

HDKey.fromExtendedKey(extendedKey[, versions])

const key =
  'xprvA2nrNbFZABcdryreWet9Ea4LvTJcGsqrMzxHx98MMrotbir7yrKCEXw7nadnHM8Dq38EGfSh6dqA9QWTyefMLEcBYJUuekgW4BYPJcr9E7j'
const hdkey = HDKey.fromExtendedKey(key)

or

const key =
  'xpub6FnCn6nSzZAw5Tw7cgR9bi15UV96gLZhjDstkXXxvCLsUXBGXPdSnLFbdpq8p9HmGsApME5hQTZ3emM2rnY5agb9rXpVGyy3bdW6EEgAtqt'
const hdkey = HDKey.fromExtendedKey(key)

HDKey.fromJSON(obj)

Creates an hdkey object from an object created via hdkey.toJSON().

hdkey.derive(path)

Derives the hdkey at path from the current hdkey.

const seed = 'fffcf9f6f3f0edeae7e4e1dedbd8d5d2cfccc9c6c3c0bdbab7b4b1aeaba8a5a29f9c999693908d8a8784817e7b7875726f6c696663605d5a5754514e4b484542'
const hdkey = HDKey.fromMasterSeed(Buffer.from(seed, 'hex'))
const childkey = hdkey.derive("m/0/2147483647'/1")

console.log(childkey.privateExtendedKey)
// -> "xprv9zFnWC6h2cLgpmSA46vutJzBcfJ8yaJGg8cX1e5StJh45BBciYTRXSd25UEPVuesF9yog62tGAQtHjXajPPdbRCHuWS6T8XA2ECKADdw4Ef"
console.log(childkey.publicExtendedKey)
// -> "xpub6DF8uhdarytz3FWdA8TvFSvvAh8dP3283MY7p2V4SeE2wyWmG5mg5EwVvmdMVCQcoNJxGoWaU9DCWh89LojfZ537wTfunKau47EL2dhHKon"

hdkey.sign(hash)

Signs the buffer hash with the private key using secp256k1 and returns the signature as a buffer.

hdkey.verify(hash, signature)

Verifies that the signature is valid for hash and the hdkey's public key using secp256k1. Returns true for valid, false for invalid. Throws if the hash or signature is the wrong length.

hdkey.wipePrivateData()

Wipes all record of the private key from the hdkey instance. After calling this method, the instance will behave as if it was created via HDKey.fromExtendedKey(xpub).

hdkey.toJSON()

Serializes the hdkey to an object that can be JSON.stringify()ed.

const seed = 'fffcf9f6f3f0edeae7e4e1dedbd8d5d2cfccc9c6c3c0bdbab7b4b1aeaba8a5a29f9c999693908d8a8784817e7b7875726f6c696663605d5a5754514e4b484542'
const hdkey = HDKey.fromMasterSeed(Buffer.from(seed, 'hex'))

console.log(hdkey.toJSON())
// -> {
//      xpriv: 'xprv9s21ZrQH143K31xYSDQpPDxsXRTUcvj2iNHm5NUtrGiGG5e2DtALGdso3pGz6ssrdK4PFmM8NSpSBHNqPqm55Qn3LqFtT2emdEXVYsCzC2U',
//      xpub: 'xpub661MyMwAqRbcFW31YEwpkMuc5THy2PSt5bDMsktWQcFF8syAmRUapSCGu8ED9W6oDMSgv6Zz8idoc4a6mr8BDzTJY47LJhkJ8UB7WEGuduB'
//    }

hdkey.privateKey

Getter/Setter of the hdkey's private key, stored as a buffer.

hdkey.publicKey

Getter/Setter of the hdkey's public key, stored as a buffer.

hdkey.privateExtendedKey

Getter/Setter of the hdkey's xprv, stored as a string.

hdkey.publicExtendedKey

Getter/Setter of the hdkey's xpub, stored as a string.

Developing

Dev

yarn watch

Test

yarn test

Cov

yarn cov

Versioning

We can maybe use SemVer for versioning. For the versions available, see the link to tags on this repository.

References

• https://github.com/cryptocoinjs/hdkey

Licensing

State what the license is and how to find the text version of the license.