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Github, Ledger Devs Slack

@ledgerhq/hw-app-eth

Ledger Hardware Wallet ETH JavaScript bindings.

API

Table of Contents

Eth

Ethereum API

Parameters

  • transport Transport
  • scrambleKey (optional, default "w0w")
  • loadConfig LoadConfig (optional, default {})

Examples

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

getAddress

get Ethereum address for a given BIP 32 path.

Parameters
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

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 : the BIP32 path to sign the transaction on
  • rawTxHex string : the raw ethereum transaction in hexadecimal to sign
  • resolution (LedgerEthTransactionResolution | null)? : resolution is an object with all "resolved" metadata necessary to allow the device to clear sign information. This includes: ERC20 token information, plugins, contracts, NFT signatures,... You must explicitly provide something to avoid having a warning. By default, you can use Ledger's service or your own resolution service. See services/types.js for the contract. Setting the value to "null" will fallback everything to blind signing but will still allow the device to sign the transaction.
Examples
import ledgerService from "@ledgerhq/hw-app-eth/lib/services/ledger"
const tx = "e8018504e3b292008252089428ee52a8f3d6e5d15f8b131996950d7f296c7952872bd72a2487400080"; // raw tx to sign
const resolution = await ledgerService.resolveTransaction(tx);
const result = eth.signTransaction("44'/60'/0'/0/0", tx, resolution);
console.log(result);

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

getAppConfiguration

Returns Promise<{arbitraryDataEnabled: number, erc20ProvisioningNecessary: number, starkEnabled: number, starkv2Supported: 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
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}>

signEIP712HashedMessage

Sign a prepared message following web3.eth.signTypedData specification. The host computes the domain separator and hashStruct(message)

Parameters
Examples
eth.signEIP712HashedMessage("44'/60'/0'/0/0", Buffer.from("0101010101010101010101010101010101010101010101010101010101010101").toString("hex"), Buffer.from("0202020202020202020202020202020202020202020202020202020202020202").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}>

starkGetPublicKey

get Stark public key for a given BIP 32 path.

Parameters

Returns Promise<Buffer> the Stark public key

starkSignOrder

sign a Stark order

Parameters
  • path string a path in BIP 32 format
  • sourceTokenAddress (string | undefined)
  • sourceQuantization BigNumber quantization used for the source token
  • destinationTokenAddress (string | undefined)
  • destinationQuantization BigNumber quantization used for the destination token
  • sourceVault number ID of the source vault
  • destinationVault number ID of the destination vault
  • amountSell BigNumber amount to sell
  • amountBuy BigNumber amount to buy
  • nonce number transaction nonce
  • timestamp number transaction validity timestamp

Returns Promise<(Buffer | {r: string, s: string})> the signature

starkSignOrder_v2

sign a Stark order using the Starkex V2 protocol

Parameters
  • path string a path in BIP 32 format
  • sourceTokenAddress (string | undefined)
  • sourceQuantizationType StarkQuantizationType quantization type used for the source token
  • sourceQuantization (BigNumber | undefined)
  • sourceMintableBlobOrTokenId (BigNumber | undefined)
  • destinationTokenAddress (string | undefined)
  • destinationQuantizationType StarkQuantizationType quantization type used for the destination token
  • destinationQuantization (BigNumber | undefined)
  • destinationMintableBlobOrTokenId (BigNumber | undefined)
  • sourceVault number ID of the source vault
  • destinationVault number ID of the destination vault
  • amountSell BigNumber amount to sell
  • amountBuy BigNumber amount to buy
  • nonce number transaction nonce
  • timestamp number transaction validity timestamp

Returns Promise<(Buffer | {r: string, s: string})> the signature

starkSignTransfer

sign a Stark transfer

Parameters
  • path string a path in BIP 32 format
  • transferTokenAddress (string | undefined)
  • transferQuantization BigNumber quantization used for the token to be transferred
  • targetPublicKey string target Stark public key
  • sourceVault number ID of the source vault
  • destinationVault number ID of the destination vault
  • amountTransfer BigNumber amount to transfer
  • nonce number transaction nonce
  • timestamp number transaction validity timestamp

Returns Promise<(Buffer | {r: string, s: string})> the signature

starkSignTransfer_v2

sign a Stark transfer or conditional transfer using the Starkex V2 protocol

Parameters
  • path string a path in BIP 32 format
  • transferTokenAddress (string | undefined)
  • transferQuantizationType StarkQuantizationType quantization type used for the token to be transferred
  • transferQuantization (BigNumber | undefined)
  • transferMintableBlobOrTokenId (BigNumber | undefined)
  • targetPublicKey string target Stark public key
  • sourceVault number ID of the source vault
  • destinationVault number ID of the destination vault
  • amountTransfer BigNumber amount to transfer
  • nonce number transaction nonce
  • timestamp number transaction validity timestamp
  • conditionalTransferAddress string?
  • conditionalTransferFact BigNumber?

Returns Promise<(Buffer | {r: string, s: string})> the signature

starkProvideQuantum

provide quantization information before singing a deposit or withdrawal Stark powered contract call

It shall be run following a provideERC20TokenInformation call for the given contract

Parameters
  • operationContract (string | undefined) contract address of the token to be transferred (not present for ETH)
  • operationQuantization BigNumber quantization used for the token to be transferred

Returns Promise<boolean>

starkProvideQuantum_v2

provide quantization information before singing a deposit or withdrawal Stark powered contract call using the Starkex V2 protocol

It shall be run following a provideERC20TokenInformation call for the given contract

Parameters
  • operationContract (string | undefined) contract address of the token to be transferred (not present for ETH)
  • operationQuantizationType StarkQuantizationType quantization type of the token to be transferred
  • operationQuantization BigNumber?
  • operationMintableBlobOrTokenId BigNumber?

Returns Promise<boolean>

starkUnsafeSign

sign the given hash over the Stark curve It is intended for speed of execution in case an unknown Stark model is pushed and should be avoided as much as possible.

Parameters
  • path string a path in BIP 32 format
  • hash string hexadecimal hash to sign

Returns Promise<(Buffer | {r: string, s: string})> the signature

eth2GetPublicKey

get an Ethereum 2 BLS-12 381 public key for a given BIP 32 path.

Parameters
Examples
eth.eth2GetPublicKey("12381/3600/0/0").then(o => o.publicKey)

Returns Promise<{publicKey: string}> an object with a publicKey

eth2SetWithdrawalIndex

Set the index of a Withdrawal key used as withdrawal credentials in an ETH 2 deposit contract call signature

It shall be run before the ETH 2 deposit transaction is signed. If not called, the index is set to 0

Parameters
  • withdrawalIndex number index path in the EIP 2334 path m/12381/3600/withdrawalIndex/0

Returns Promise<boolean> True if the method was executed successfully

loadInfosForContractMethod

Retrieve the metadatas a given contract address and a method selector

Parameters

Returns Promise<(ContractMethod | undefined)>

byContractAddressAndChainId

Retrieve the token information by a given contract address if any

Parameters

Returns (TokenInfo | null | undefined)

list

list all the ERC20 tokens informations

Returns Array<TokenInfo>

ResolutionConfig

Allows to configure precisely what the service need to resolve. for instance you can set nft:true if you need clear signing on NFTs. If you set it and it is not a NFT transaction, it should still work but will do a useless service resolution.

Type: {nft: boolean?, externalPlugins: boolean?, erc20: boolean?}

Properties