Ethereum offline sign

Ethereum transaction offline signature tool

About

Sign offline for the ETH transaction and smart contract call message transaction, return transaction data in HEX format. This allows you full control over your account's private key without having to unlock it at the ethereum node

Demo code

Get Started

npm install ethereum-offline-sign --save

Test

npm test

APIS

transferSign(nonce, to, value) Ordinary transactions are signed offline

Inputs

• nonce Sender nonce
• to The destination address of the message, left undefined for a contract-creation transaction.
• value The value transferred for the transaction in Wei

Return value

Signed transaction data in HEX format

Example:

var EtherSigner = require('ethereum-offline-sign');
var gasPrice = web3.eth.gasPrice,
	gasLimit = 4000000;
	sender = '0x01BF9878a7099b2203838f3a8E7652Ad7B127A26';
	senderPrivateKey = '0x01BF9878a7099b2203838f3a8E7652Ad7B127A26';
	destination = '0x6CE18EA1f852367f3fB6b4ad76D58f65374D9920';
    nonce = await web3.eth.getTransactionCount(sender);
    value = etherSigner.toWei(0.1, 'ether');
    
//Instantiation EtherSigner
var etherSigner = new EtherSigner(null, senderPrivateKey, gasPrice, gasLimit);

//Sign transactions offline, return signed transaction data in HEX format
var sigTx = etherSigner.transferSign(nonce, destination, value);
web3.eth.sendRawTransaction(sigTx);

deployContractSign(contract, arguments, nonce) Sign the deployed contracts

Inputs

• contract Contains contract instances of the abi, eg:web3.eth.contract(Contract.abi);
• arguments Contract constructor parameters, Type array
• nonce Contract creator nonce

Return value

Signed transaction data in HEX format

Example:

var relayContract = require('./contracts/RelayWallet.sol.js');
var contract = web3.eth.contract(relayContract.abi);
var params = [
        destination, 
        {
            data: relayContract.bytecode,
            gas: gasLimit,
            from: sender
        }
    ];
//Sign deploy contract offline, return signed transaction data in HEX format
var sigTx = etherSigner.deployContractSign(contract, params, nonce);
web3.eth.sendRawTransaction(sigTx);

contractTransferSign(method, arguments, to, nonce, value) Sign the contract function call

Inputs

• method Contract function
• arguments Contract function args, Type array
• to Contract address
• nonce Sender account nonce
• value ETH amount, default 0

Return value

Signed transaction data in HEX format

Example:

var relayContract = require('./contracts/RelayWallet.sol.js');
//relayAddress is delpoyed contract address
let relayWallet = web3.eth.contract(relayContract.abi).at(relayAddress);
let etherSigner = new EtherSigner(relayWallet, senderPrivateKey, gasPrice, gasLimit);
var params = [
        {
        	gasPrice，
            gas: gasLimit,
            from: sender
        }
    ];
//Sign deploy contract offline, return signed transaction data in HEX format
var sigTx = etherSigner.contractTransferSign('withdrawToDest', params, relayAddress, nonce, 0);
web3.eth.sendRawTransaction(sigTx);

getAddress()

Return value

Returns the ethereum address of a current private key

Example:

etherSigner.getAddress()
// 0x01bf9878a7099b2203838f3a8e7652ad7b127a26