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coinkey

JavaScript component for private keys, public keys, and addresses for crypto currencies such as Bitcoin, Litecoin, and Dogecoin. Works in both Node.js and the browser.

Package Info

github: https://github.com/cryptocoinjs/coinkey
tests: https://github.com/cryptocoinjs/coinkey/tree/master/test
issues: https://github.com/cryptocoinjs/coinkey/issues
license: MIT
versioning: SemVer

Installation

npm i --save coinkey

Usage

Common Use Cases

Generate a Bunch of Bitcoin Keys/Addresses

var CoinKey = require('coinkey')

var bitcoinKeys = []
for (var i = 0; i < 10; ++i) {
  // bitcoin supported by default
  bitcoinKeys.push(CoinKey.createRandom())
}

Generate a Bunch of Namecoin Keys/Addresses

var CoinKey = require('coinkey')
// npm install --save coininfo
var ci = require('coininfo')

var namecoins = []
for (var i = 0; i < 10; ++i) {
  namecoins.push(CoinKey.createRandom(ci('NMC')))
}

Parse a Wallet Import Key and Determine Crypto Currency

var CoinKey = require('coinkey')
var ci = require('coininfo')

var ck = CoinKey.fromWif('QVD3x1RPiWPvyxbTsfxVwaYLyeBZrQvjhZ2aZJUsbuRgsEAGpNQ2')

console.log(ck.privateKey.toString('hex')) // => c4bbcb1fbec99d65bf59d85c8cb62ee2db963f0fe106f483d9afa73bd4e39a8a
console.log(ck.publicAddress) // => DGG6AicS4Qg8Y3UFtcuwJqbuRZ3Q7WtYXv
console.log(ck.compressed) // => true
console.log(ck.versions.public === ci('DOGE').versions.public) // => true

Change to Testnet Later

var CoinKey = require('coinkey')
var ci = require('coininfo')

var ck = new CoinKey(new Buffer('1184cd2cdd640ca42cfc3a091c51d549b2f016d454b2774019c2b2d2e08529fd', 'hex'))
console.log(ck.publicAddress) // => 16UjcYNBG9GTK4uq2f7yYEbuifqCzoLMGS

//change to Testnet
ck.versions = ci('BTC-TEST')

console.log(ck.publicAddress) // => mkzgubTA5Ahi6BPSkE6MN9pEafRutznkMe

API

CoinKey(privateKey, [versions])

Constructor function.

privateKey: The private key bytes. Must be 32 bytes in length. Should be an Array, Uint8Array, or a Buffer.
versions: An object that specifies the public and private key versions for addresses and wifs. Defaults to Bitcoin mainnet.

Keys are default set to compressed is true.

var CoinKey = require('coinkey')
//npm install --save secure-random@1.x
var secureRandom = require('secure-random')

var bytes = secureRandom.randomBuffer(32)
var key1 = new CoinKey(bytes)
console.log(key1.compressed) // => true

Properties

privateWif

Get the private WIF (Wallet Import Format).

var CoinKey = require('coinkey')

var privateKeyHex = "1184cd2cdd640ca42cfc3a091c51d549b2f016d454b2774019c2b2d2e08529fd"

//Bitcoin WIF
var key = new CoinKey(new Buffer(privateKeyHex, 'hex'))
key.compressed = false
console.log(key.privateWif) // => 5Hx15HFGyep2CfPxsJKe2fXJsCVn5DEiyoeGGF6JZjGbTRnqfiD

//Litecoin WIF
var key = new CoinKey(new Buffer(privateKeyHex, 'hex'), {private: 0xB0, public: 0x30})
key.compressed = false
console.log(key.privateWif) // => 6uFjYQnot5Gtg3HpP87bp4JUpg4FH1gkkV3RyS7LHBbD9Hpt1na

publicKey

Inherited from ECKey. eckey.publicKey

publicAddress

Get the public address.

var CoinKey = require('coinkey')

var privateKeyHex = "1184cd2cdd640ca42cfc3a091c51d549b2f016d454b2774019c2b2d2e08529fd"

// Bitcoin Address
var key = new CoinKey(new Buffer(privatKeyHex, 'hex'))
console.log(key.publicAddress) // => 16UjcYNBG9GTK4uq2f7yYEbuifqCzoLMGS

// Litecoin Address
var key = new CoinKey(new Buffer(privateKeyHex, 'hex'), {private: 0xB0, public: 0x30})
console.log(key.publicAddress) // => 'LZyGd5dCPVkVUjA5QbpuUfMNgcmNDLjswH'

publicHash

Alias: pubKeyHash

Inherited from ECKey. eckey.publicHash

publicPoint

Inherited from ECKey. eckey.publicPoint

toString()

Returns the string representation.

var CoinKey = require('coinkey')

var privateKeyHex = "1184cd2cdd640ca42cfc3a091c51d549b2f016d454b2774019c2b2d2e08529fd"

//Litecoin Address
var key = new CoinKey(new Buffer(privateKeyHex, 'hex'), {private: 0xB0, public: 0x30})
console.log(key.toString())
// => T3e2me1BvRs95K7E8eQ8eha9oRPL1g2U6vmjE5px6RjzbUTvKZsf: LZyGd5dCPVkVUjA5QbpuUfMNgcmNDLjswH

Methods

fromWif(wif, [versions])

Class method to create a CoinKey from a wif.

var ck = CoinKey.fromWif('KwomKti1X3tYJUUMb1TGSM2mrZk1wb1aHisUNHCQXTZq5auC2qc3');
console.log(ck.compressed) // => true
console.log(ck.privateKey.toString('hex')) // => 1184cd2cdd640ca42cfc3a091c51d549b2f016d454b2774019c2b2d2e08529fd
console.log(ck.publicAddress) // => 1FkKMsKNJqWSDvTvETqcCeHcUQQ64kSC6s

Browser Support

Clone the repo:

git clone https://github.com/cryptocoinjs/coinkey

Install Browserify

npm install -g browserify

Nav to repo:

cd coinkey

Install dependencies:

npm install

Run browserify:

browserify --standalone coinkey lib/coinkey.js > lib/coinkey.bundle.js

You can now drop coinkey.bundle.js in a <script> tag.