hdkey

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JavaScript component for Bitcoin hierarchical deterministic keys (BIP32)

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hdkey
=====

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A JavaScript component for [BIP32](https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki)(hierarchical deterministic keys).

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

```bash
npm i --save hdkey
```

Usage
-----

**example:**

```js
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.

```js
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.

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

**or**

```js
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`.

```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"
```

Newer, "hardened" derivation paths look like this:

```js
// 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.

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
----------
- 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

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