Generate temporary Ethereum Wallet
const sjcl = require("sjcl");
const eth_util = require('ethereumjs-util');
const keythereum = require("keythereum");
let key = keythereum.create();
let privateKey = key.privateKey;
let address = eth_util.privateToAddress(privateKey);
//let privateKey = new Buffer('c6d03f9b833e8f499849951f3d355509060dca1272f48103a48c9bfa9e993c50', 'hex');
'0x' + address.toString('hex')
Generating Message
function getMessage(event, ticket, expire = 5) {
return event + ticket + (Math.ceil((new Date()).getTime() / (1000 * 60 * expire)) * (1000 * 60 * expire)) / 1000;
}
let message = getMessage(
'0x0000000000000000000000000000000000000000',
'0x64ab3380c6ce12b59bfddfe280ad74c0311d6bd0dd9c3058f39734b7c724c5a1'
);
Message Signing
function signMessage(message, privKey) {
const keccak = require("keccak");
const secp256k1 = require("secp256k1");
const sig = secp256k1.sign(keccak('keccak256').update(Buffer.concat([
Buffer.from('\u0019Ethereum Signed Message:\n' + message.length.toString()),
Buffer.from(message)
])).digest(), privKey);
return '0x' + Buffer.concat([
sig.signature.slice(0, 32),
sig.signature.slice(32, 64),
new Buffer((sig.recovery + 27).toString(16), 'hex')
//new Buffer(`0x${(sig.recovery.toString(16).length % 2) ? `0${sig.recovery.toString(16)}` : sig.recovery.toString(16)}`.slice(2), 'hex')
]).toString('hex');
}
let messageSigned = signMessage(message, privateKey)
Message Verification
function verifySignedMessage(message, sign) {
const keccak = require("keccak");
const secp256k1 = require("secp256k1");
const sig = Buffer.from(sign.slice(2), 'hex');
const pubKey = secp256k1.publicKeyConvert(secp256k1.recover(
keccak('keccak256').update(Buffer.concat([
Buffer.from('\u0019Ethereum Signed Message:\n' + message.length.toString()),
Buffer.from(message)
])).digest(),
Buffer.concat([sig.slice(0, 32), sig.slice(32, 64)], 64), sig[64] - 27
), false).slice(1);
return '0x' + keccak('keccak256').update(pubKey).digest().slice(-20).toString('hex');
}
verifySignedMessage(message, messageSigned);
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