truffle-hdwallet-provider-privkey

truffle-hdwallet-provider-privkey

HD Wallet-enabled Web3 provider. Use it to sign transactions for addresses derived from a raw private key string.

If you are using Web3 1.0.0, you do not need this package! There is a function to get an account object from a private key. The reason I made this package was because this function doesn't exist in the legacy Web3 library.

Install

$ npm install truffle-hdwallet-provider-privkey

General Usage

You can use this provider wherever a Web3 provider is needed, not just in Truffle. For Truffle-specific usage, see next section.

const HDWalletProvider = require("truffle-hdwallet-provider-privkey");
const privKeys = ["ce2eab51c7c428...", "46c36f1970dcf37ec..."]; // private keys
const provider = new HDWalletProvider(privKeys, "http://localhost:8545");

By default, the HDWalletProvider will use the address of the first address that's generated from the private key. Currently, the HDWalletProvider manages only one address at a time, but it can be easily upgraded to manage (i.e., "unlock") multiple addresses.

Parameters:

• privateKeys: string. Array of private keys for multiple accounts (DO NOT SHARE THEM EVER).
• provider_uri: string. URI of Ethereum client to send all other non-transaction-related Web3 requests.

Truffle Usage

You can easily use this within a Truffle configuration. For instance:

truffle.js

const HDWalletProvider = require("truffle-hdwallet-provider-privkey");

const privateKeys = ["ce2eab51c7c428...", "46c36f1970dcf37ec..."]; // private keys

module.exports = {
  networks: {
    development: {
      host: "localhost",
      port: 8545,
      network_id: "*" // Match any network id
    },
    ropsten: {
      provider: () => {
        return new HDWalletProvider(privateKeys, "https://ropsten.infura.io/MY_INFURA_KEY")
      },
      network_id: 3
    }
  }
};

Web3 Provider

You can also use the Wallet provider as an easy way to get a Web3 object that has an unlocked account to sign transactions through an INFURA node.

const Web3 = require('web3')
const WalletProvider = require('truffle-hdwallet-provider-privkey')

const privKey = "2442e1526f1..."; // raw private key

const w = new WalletProvider(privKey, "https://ropsten.infura.io/MY_INFURA_KEY")
web3 = new Web3(w.engine)

Notes

Make sure the from address you use when sending transactions is entirely lowercase or you will see an error like this:

TypeError: private key should be a Buffer