@coolwallets/sdk-core v0.0.3

SDK-Core

This package handles the apdu request for a CoolWalletS, also export a couple of classes to easily get started with CoolWalletS.

Use CWSDevice to register your current device, reset wallet or tune other settings.

Use CWSWallet to create or recover wallet in CoolWalletS.

Install

npm i @coolwallets/sdk-core

Quick Start

1. Keypair generation

For every APDU command, CoolWalletS will verify the identity of the requesting device (the App) by a digital signature, so we need to generate a key pair first for a new App.

import { generateKeyPair } from '@coolwallets/sdk-core'
const { publicKey: appPublicKey, privateKey: appPrivateKey } = generateKeyPair()

// store it locally on web storage
localStorage.setItem('appPublicKey', appPublicKey)
localStorage.setItem('appPrivateKey', appPrivateKey)

2. Device (App) Registration

After we have our keys ready, we need to register our device (app) so the wallet can recognize us.

This can be done by the CWSDevice instance. In the constructor, we need to put in a Transport object for bluetooth transport, and the appPrivateKey we just generated to sign all the commands. Here's a example how to use web-ble-transport with CWSDevice

const transport = new WebBleTransport();
const device =  new CWSDevice(transport, appPrivateKey)

You may notice that there's one more optional field called appId in the constructor, we don't have it yet so we will ignore it, and we will put the value in later with setAppId after we get our own appId from register.

device.register(appPublicKey, '123456', 'myFirstApp')
    .then( appId =>{
        localStorage.setItem("appId", appId)
        device.setAppId(appId)
        console.log(`Store AppId complete! ${appId}`)
    })

Congrats! Now your App can communicate with the hardware wallet, If you need to pair another App with the wallet, use a registered App to call device.getPairingPassword() and use it as the second parameter in register()

3. Wallet Creation

You can use createWallet to securely generate a new master seed with the card, or use setSeed to recover one from a hex seed.

import { CWSWallet } from '@coolwallets/sdk-core'
const wallet = new CWSWallet(transport, appPrivateKey, appId)

wallet.createWallet(12).then(_ => {
    // Sum all the seeds shown on CoolWalletS
    wallet.sendCheckSum(873209).then( _ => {
        console.log(`Successfully create a new wallet!`)
    })
})

4. Your turn

Build your own App with our sdk!