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const EventEmitter = require('events').EventEmitter
const Wallet = require('ethereumjs-wallet')
const ethUtil = require('ethereumjs-util')
const type = 'Simple Key Pair'
module.exports = class SimpleKeyring extends EventEmitter {
static type() {
return type
}
constructor(opts) {
super()
this.type = type
this.opts = opts || {}
this.wallets = []
}
serialize() {
return this.wallets.map(w => w.getPrivateKey().toString('hex'))
}
deserialize(wallets = []) {
this.wallets = wallets.map((w) => {
var b = new Buffer(w, 'hex')
const wallet = Wallet.fromPrivateKey(b)
return wallet
})
}
addAccounts(n = 1) {
var newWallets = []
for (var i = 0; i < n; i++) {
newWallets.push(Wallet.generate())
}
this.wallets = this.wallets.concat(newWallets)
return newWallets.map(w => w.getAddress().toString('hex'))
}
getAccounts() {
return this.wallets.map(w => w.getAddress().toString('hex'))
}
// tx is an instance of the ethereumjs-transaction class.
signTransaction(address, tx) {
const wallet = this.getWalletForAccount(address)
var privKey = wallet.getPrivateKey()
tx.sign(privKey)
return tx
}
// For eth_sign, we need to sign transactions:
signMessage(withAccount, data) {
const wallet = this.getWalletForAccount(withAccount)
const message = ethUtil.removeHexPrefix(data)
var privKey = wallet.getPrivateKey()
var msgSig = ethUtil.ecsign(new Buffer(message, 'hex'), privKey)
var rawMsgSig = ethUtil.bufferToHex(concatSig(msgSig.v, msgSig.r, msgSig.s))
return rawMsgSig
}
getWalletForAccount(account) {
return this.wallets.find(w => w.getAddress().toString('hex') === account)
}
}
function concatSig (v, r, s) {
const rSig = ethUtil.fromSigned(r)
const sSig = ethUtil.fromSigned(s)
const vSig = ethUtil.bufferToInt(v)
const rStr = padWithZeroes(ethUtil.toUnsigned(rSig).toString('hex'), 64)
const sStr = padWithZeroes(ethUtil.toUnsigned(sSig).toString('hex'), 64)
const vStr = ethUtil.stripHexPrefix(ethUtil.intToHex(vSig))
return ethUtil.addHexPrefix(rStr.concat(sStr, vStr)).toString('hex')
}
function padWithZeroes (number, length) {
var myString = '' + number
while (myString.length < length) {
myString = '0' + myString
}
return myString
}
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