hw-app-eth

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@ledgerhq/hw-app-eth

Ledger Hardware Wallet ETH JavaScript bindings.

API

Table of Contents

• byContractAddress
  • Parameters
• list
• Eth
  • Parameters
  • Examples
  • getAddress
    • Parameters
    • Examples
  • provideERC20TokenInformation
    • Parameters
    • Examples
  • signTransaction
    • Parameters
    • Examples
  • getAppConfiguration
  • signPersonalMessage
    • Parameters
    • Examples

byContractAddress

Retrieve the token information by a given contract address if any

Parameters

• contract string

Returns TokenInfo?

list

list all the ERC20 tokens informations

Returns Array<TokenInfo>

Eth

Ethereum API

Parameters

• transport Transport<any>
• scrambleKey string (optional, default "w0w")

Examples

import Eth from "@ledgerhq/hw-app-eth";
const eth = new Eth(transport)

getAddress

get Ethereum address for a given BIP 32 path.

Parameters

• path string a path in BIP 32 format
• boolDisplay boolean?
• boolChaincode boolean?

Examples

eth.getAddress("44'/60'/0'/0/0").then(o => o.address)

Returns Promise<{publicKey: string, address: string, chainCode: string?}> an object with a publicKey, address and (optionally) chainCode

provideERC20TokenInformation

This commands provides a trusted description of an ERC 20 token to associate a contract address with a ticker and number of decimals.

It shall be run immediately before performing a transaction involving a contract calling this contract address to display the proper token information to the user if necessary.

Parameters

• info any : a blob from "erc20.js" utilities that contains all token information.
  • info.data

Examples

import { byContractAddress } from "@ledgerhq/hw-app-eth/erc20"
const zrxInfo = byContractAddress("0xe41d2489571d322189246dafa5ebde1f4699f498")
if (zrxInfo) await appEth.provideERC20TokenInformation(zrxInfo)
const signed = await appEth.signTransaction(path, rawTxHex)

Returns Promise<boolean>

signTransaction

You can sign a transaction and retrieve v, r, s given the raw transaction and the BIP 32 path of the account to sign

Parameters

• path string
• rawTxHex string

Examples

eth.signTransaction("44'/60'/0'/0/0", "e8018504e3b292008252089428ee52a8f3d6e5d15f8b131996950d7f296c7952872bd72a2487400080").then(result => ...)

Returns Promise<{s: string, v: string, r: string}>

getAppConfiguration

Returns Promise<{arbitraryDataEnabled: number, version: string}>

signPersonalMessage

You can sign a message according to eth_sign RPC call and retrieve v, r, s given the message and the BIP 32 path of the account to sign.

Parameters

• path string
• messageHex string

Examples

eth.signPersonalMessage("44'/60'/0'/0/0", Buffer.from("test").toString("hex")).then(result => {
var v = result['v'] - 27;
v = v.toString(16);
if (v.length < 2) {
v = "0" + v;
}
console.log("Signature 0x" + result['r'] + result['s'] + v);
})

Returns Promise<{v: number, s: string, r: string}>