@ont-dev/hdkey-secp256r1

hdkey - secp256r1 version
=====


A JavaScript component for BIP32(hierarchical deterministic keys).

Installation
------------

npm i --save @ont-dev/hdkey-secp256r1

Usage
-----

example:

``js
var HDKey = require('@ont-dev/hdkey-secp256r1')
var seed = 'a0c42a9c3ac6abf2ba6a9946ae83af18f51bf1c9fa7dacc4c92513cc4dd015834341c775dcd4c0fac73547c5662d81a9e9361a0aac604a73a321bd9103bce8af'
var hdkey = HDKey.fromMasterSeed(new Buffer(seed, 'hex'))
console.log(hdkey.privateExtendedKey)
// => 'xprv9s21ZrQH143K2SKJK9EYRW3Vsg8tWVHRS54hAJasj1eGsQXeWDHLeuu5hpLHRbeKedDJM4Wj9wHHMmuhPF8dQ3bzyup6R7qmMQ1i1FtzNEW'
console.log(hdkey.publicExtendedKey)
// => 'xpub661MyMwAqRbcEvPmRAmYndzERhyNux1GoHzHxgzVHMBFkCro3kbbCiDZZ5XabZDyXPj5mH3hktvkjhhUdCQxie5e1g4t2GuAWNbPmsSfDp2'
`

$3

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

`js
var seed = 'a0c42a9c3ac6abf2ba6a9946ae83af18f51bf1c9fa7dacc4c92513cc4dd015834341c775dcd4c0fac73547c5662d81a9e9361a0aac604a73a321bd9103bce8af'
var hdkey = HDKey.fromMasterSeed(new Buffer(seed, 'hex'))
`

$3

Creates an hdkey object from a xprv or xpub extended key string. Accepts an optional versions object.

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

or

`js
var key = 'xpub6FnCn6nSzZAw5Tw7cgR9bi15UV96gLZhjDstkXXxvCLsUXBGXPdSnLFbdpq8p9HmGsApME5hQTZ3emM2rnY5agb9rXpVGyy3bdW6EEgAtqt'
var hdkey = HDKey.fromExtendedKey(key)
`

$3

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

---

$3

Derives the hdkey at path from the current hdkey.

`js
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"
`

$3

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

$3

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.

$3

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

`js
var seed = 'fffcf9f6f3f0edeae7e4e1dedbd8d5d2cfccc9c6c3c0bdbab7b4b1aeaba8a5a29f9c999693908d8a8784817e7b7875726f6c696663605d5a5754514e4b484542'
var hdkey = HDKey.fromMasterSeed(Buffer.from(seed, 'hex'))

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

$3

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

$3

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

$3

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

$3

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

References
----------
- https://github.com/bitcoinjs/bitcoinjs-lib/blob/master/src/hdnode.js
- http://bip32.org/
- http://blog.richardkiss.com/?p=313
- https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki
- http://bitcoinmagazine.com/8396/deterministic-wallets-advantages-flaw/

License
-------

MIT