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  • License MIT

Bitcoin BIP32 hierarchical deterministic keys

Package Exports

  • hdkey
  • hdkey/lib/hdkey.js

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (hdkey) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

hdkey

NPM Package build status js-standard-style

A JavaScript component for BIP32(hierarchical deterministic keys).

Installation

npm i --save hdkey

Usage

example:

var HDKey = require('hdkey')
var seed = 'a0c42a9c3ac6abf2ba6a9946ae83af18f51bf1c9fa7dacc4c92513cc4dd015834341c775dcd4c0fac73547c5662d81a9e9361a0aac604a73a321bd9103bce8af'
var hdkey = HDKey.fromMasterSeed(Buffer.from(seed, 'hex'))
console.log(hdkey.privateExtendedKey)
// => 'xprv9s21ZrQH143K2SKJK9EYRW3Vsg8tWVHRS54hAJasj1eGsQXeWDHLeuu5hpLHRbeKedDJM4Wj9wHHMmuhPF8dQ3bzyup6R7qmMQ1i1FtzNEW'
console.log(hdkey.publicExtendedKey)
// => 'xpub661MyMwAqRbcEvPmRAmYndzERhyNux1GoHzHxgzVHMBFkCro3kbbCiDZZ5XabZDyXPj5mH3hktvkjhhUdCQxie5e1g4t2GuAWNbPmsSfDp2'

HDKey.fromMasterSeed(seedBuffer[, versions])

Creates an hdkey object from a master seed buffer. Accepts an optional versions object.

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

HDKey.fromExtendedKey(extendedKey[, versions, skipVerification])

Creates an hdkey object from a xprv or xpub extended key string. Accepts an optional versions object & an optional skipVerification boolean. If skipVerification is set to true, then the provided public key's x (and y if uncompressed) coordinate will not will be verified to be on the curve.

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

or

var key = 'xpub6FnCn6nSzZAw5Tw7cgR9bi15UV96gLZhjDstkXXxvCLsUXBGXPdSnLFbdpq8p9HmGsApME5hQTZ3emM2rnY5agb9rXpVGyy3bdW6EEgAtqt'
var 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.

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

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

Newer, "hardened" derivation paths look like this:

// as defined by BIP-44
var childkey = hdkey.derive("m/44'/0'/0'/0/0");

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.

var seed = 'fffcf9f6f3f0edeae7e4e1dedbd8d5d2cfccc9c6c3c0bdbab7b4b1aeaba8a5a29f9c999693908d8a8784817e7b7875726f6c696663605d5a5754514e4b484542'
var 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.

References

License

MIT