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/* ID Management
*
* This module exists to hold the decrypted credentials for the current session.
* It therefore exposes sign methods, because it is able to perform these
* with noa dditional authentication, because its very instantiation
* means the vault is unlocked.
*/
const ethUtil = require('ethereumjs-util')
const BN = ethUtil.BN
const Transaction = require('ethereumjs-tx')
module.exports = IdManagement
function IdManagement (opts) {
if (!opts) opts = {}
this.keyStore = opts.keyStore
this.derivedKey = opts.derivedKey
this.configManager = opts.configManager
this.hdPathString = "m/44'/60'/0'/0"
this.getAddresses = function () {
return this.keyStore.getAddresses(this.hdPathString).map(function (address) { return '0x' + address })
}
this.signTx = function (txParams) {
// calculate gas with custom gas multiplier
var gasMultiplier = this.configManager.getGasMultiplier() || 1
var gasPrice = new BN(ethUtil.stripHexPrefix(txParams.gasPrice), 16)
gasPrice = gasPrice.mul(new BN(gasMultiplier * 100)).div(new BN(100, 10))
txParams.gasPrice = ethUtil.intToHex(gasPrice.toNumber())
// normalize values
txParams.to = ethUtil.addHexPrefix(txParams.to)
txParams.from = ethUtil.addHexPrefix(txParams.from.toLowerCase())
txParams.value = ethUtil.addHexPrefix(txParams.value)
txParams.data = ethUtil.addHexPrefix(txParams.data)
txParams.gasLimit = ethUtil.addHexPrefix(txParams.gasLimit || txParams.gas)
txParams.nonce = ethUtil.addHexPrefix(txParams.nonce)
var tx = new Transaction(txParams)
// sign tx
var privKeyHex = this.exportPrivateKey(txParams.from)
var privKey = ethUtil.toBuffer(privKeyHex)
tx.sign(privKey)
// Add the tx hash to the persisted meta-tx object
var txHash = ethUtil.bufferToHex(tx.hash())
var metaTx = this.configManager.getTx(txParams.metamaskId)
metaTx.hash = txHash
this.configManager.updateTx(metaTx)
// return raw serialized tx
var rawTx = ethUtil.bufferToHex(tx.serialize())
return rawTx
}
this.signMsg = function (address, message) {
// sign message
var privKeyHex = this.exportPrivateKey(address.toLowerCase())
var privKey = ethUtil.toBuffer(privKeyHex)
var msgSig = ethUtil.ecsign(new Buffer(message.replace('0x', ''), 'hex'), privKey)
var rawMsgSig = ethUtil.bufferToHex(concatSig(msgSig.v, msgSig.r, msgSig.s))
return rawMsgSig
}
this.getSeed = function () {
return this.keyStore.getSeed(this.derivedKey)
}
this.exportPrivateKey = function (address) {
var privKeyHex = ethUtil.addHexPrefix(this.keyStore.exportPrivateKey(address, this.derivedKey, this.hdPathString))
return privKeyHex
}
}
function padWithZeroes (number, length) {
var myString = '' + number
while (myString.length < length) {
myString = '0' + myString
}
return myString
}
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')
}
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