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const ethUtil = require('ethereumjs-util')
module.exports = IdManagement
function IdManagement(opts) {
if (!opts) opts = {}
this.keyStore = opts.keyStore
this.derivedKey = opts.derivedKey
this.hdPathString = "m/44'/60'/0'/0"
this.getAddresses = function(){
return keyStore.getAddresses(this.hdPathString).map(function(address){ return '0x'+address })
}
this.signTx = function(txParams){
// normalize values
txParams.to = ethUtil.addHexPrefix(txParams.to)
txParams.from = ethUtil.addHexPrefix(txParams.from)
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 = configManager.getTx(txParams.metamaskId)
metaTx.hash = txHash
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)
var privKey = ethUtil.toBuffer(privKeyHex)
var msgHash = ethUtil.sha3(message)
var msgBuffer = new Buffer(message.replace('0x',''), 'hex')
var msgSig = ethUtil.ecsign(msgBuffer, 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 pad_with_zeroes(number, length){
var my_string = '' + number;
while (my_string.length < length) {
my_string = '0' + my_string;
}
return my_string;
}
function concatSig(v, r, s) {
r = pad_with_zeroes(ethUtil.fromSigned(r), 64)
s = pad_with_zeroes(ethUtil.fromSigned(s), 64)
v = ethUtil.bufferToInt(v)
r = ethUtil.toUnsigned(r).toString('hex')
s = ethUtil.toUnsigned(s).toString('hex')
v = ethUtil.stripHexPrefix(ethUtil.intToHex(v))
return ethUtil.addHexPrefix(r.concat(s, v).toString("hex"))
}
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