support cloudHSM as signing method

app/mmConfig.js

@@ -26,6 +26,12 @@ module.exports = {
    */
   WALLET_PRIVATE_KEY: process.env.WALLET_PRIVATE_KEY,
 
+  /**
+   * GoogleCloud KMS keyVersionName, used unless both of SIGNING_URL and WALLET_PRIVATE_KEY are not set.
+   * Txs or messages are signed by GoogleCloud KMS remotely
+   */
+  WALLET_KEY_VERSION_NAME: process.env.WALLET_KEY_VERSION_NAME,
+
   // AMM
   AMMWRAPPER_CONTRACT_ADDRESS: process.env.AMMWRAPPER_CONTRACT_ADDRESS,
 

package.json

@@ -59,6 +59,8 @@
     "hardhat/**/@ethereumjs/tx": "3.5.0"
   },
   "dependencies": {
+    "@ethersproject/abstract-signer": "5.7.0",
+    "@toolchainx/ethers-gcp-kms-signer": "1.0.5",
     "@0x/contract-addresses": "^4.11.0",
     "@0x/subproviders": "6.0.8",
     "@babel/runtime": "7.3.1",

src/check/index.ts

@@ -30,8 +30,9 @@ export const checkMMSK = async (config: ConfigForStart) => {
   } else {
     quoter = new QuoteDispatcher(config.HTTP_SERVER_ENDPOINT, QuoterProtocol.HTTP)
   }
-  const wallet = getWallet()
-  await startUpdater(quoter, wallet.address)
+  const wallet = await getWallet()
+  const walletAddress = await wallet.getAddress()
+  await startUpdater(quoter, walletAddress)
 
   for (let i = 0; i < arr.length; i += 1) {
     const item = arr[i]

src/config.ts

@@ -1,13 +1,17 @@
 import * as readlineSync from 'readline-sync'
 import { ConfigForStart } from './types'
-import { Wallet } from 'ethers'
+import { ethers, Wallet } from 'ethers'
+import { GcpKmsSignerCredentials, GcpKmsSigner } from '@toolchainx/ethers-gcp-kms-signer'
+import { TypedDataSigner } from '@ethersproject/abstract-signer'
+import * as path from 'path'
 
 const config = {
   EXCHANGE_URL: null,
   PROVIDER_URL: null,
 
   WALLET_ADDRESS: null,
   WALLET_PRIVATE_KEY: null,
+  WALLET_KEY_VERSION_NAME: null,
   USE_KEYSTORE: true,
 
   WALLET_KEYSTORE: null,
@@ -30,12 +34,33 @@ const setConfig = (conf: ConfigForStart) => {
   return Object.assign(config, conf)
 }
 
-const getWallet = () => {
-  return new Wallet(
-    config.WALLET_PRIVATE_KEY.startsWith('0x')
-      ? config.WALLET_PRIVATE_KEY
-      : '0x' + config.WALLET_PRIVATE_KEY
-  )
+const getWallet = async (): Promise<ethers.Signer & TypedDataSigner> => {
+  if (config.WALLET_PRIVATE_KEY) {
+    return new Wallet(
+      config.WALLET_PRIVATE_KEY.startsWith('0x')
+        ? config.WALLET_PRIVATE_KEY
+        : '0x' + config.WALLET_PRIVATE_KEY
+    )
+  } else if (config.WALLET_KEY_VERSION_NAME) {
+    const signer = new GcpKmsSigner(getKmsCredentials(config.WALLET_KEY_VERSION_NAME))
+    return signer
+  } else {
+    return null
+  }
+}
+
+const getKmsCredentials = (fullVersionedKeyName: string): GcpKmsSignerCredentials => {
+  if (!fullVersionedKeyName || fullVersionedKeyName.length === 0) {
+    return null
+  }
+  const strSplits = fullVersionedKeyName.split(path.sep)
+  return {
+    projectId: strSplits[1],
+    locationId: strSplits[3],
+    keyRingId: strSplits[5],
+    keyId: strSplits[7],
+    keyVersion: strSplits[9],
+  }
 }
 
 export { config, setConfig, getWallet }

src/handler/signOrder.ts

@@ -50,7 +50,8 @@ export const signOrder = async (ctx) => {
   const { chainID, walletType } = ctx
   const order = ctx.request.body
   const protocol = ctx.request.body.protocol
-  const signer = getWallet()
+  const signer = await getWallet()
+  const signerAddress = await signer.getAddress()
   console.log('signer')
   console.log(signer)
   const config = updaterStack.markerMakerConfigUpdater.cacheResult
@@ -59,12 +60,12 @@ export const signOrder = async (ctx) => {
     switch (protocol) {
       case Protocol.PMMV5:
         signature =
-          signer.address.toLowerCase() == order.pmmOrder.makerAddress.toLowerCase()
+          signerAddress.toLowerCase() == order.pmmOrder.makerAddress.toLowerCase()
             ? await signPMMV5ByEOA(order.orderSignDigest, signer)
             : await signByMMPSigner(order.orderSignDigest, order.userAddr, order.feeFactor, signer)
         break
       case Protocol.RFQV1:
-        if (signer.address.toLowerCase() == order.rfqOrder.makerAddr.toLowerCase()) {
+        if (signerAddress.toLowerCase() == order.rfqOrder.makerAddr.toLowerCase()) {
           const signatureTypedData = await signRFQOrder(
             chainID,
             config.addressBookV5.RFQ,
@@ -95,7 +96,7 @@ export const signOrder = async (ctx) => {
         }
         break
       case Protocol.RFQV2:
-        if (signer.address.toLowerCase() == order.rfqOrder.maker.toLowerCase()) {
+        if (signerAddress.toLowerCase() == order.rfqOrder.maker.toLowerCase()) {
           signature = await signOffer(
             chainID,
             config.addressBookV5.RFQV2,

src/signer/pmmv5.ts

@@ -7,12 +7,13 @@ import {
   EIP712Types,
 } from '0x-v2-order-utils'
 import * as ethUtils from 'ethereumjs-util'
-import { utils, Wallet } from 'ethers'
+import { utils } from 'ethers'
 import axios from 'axios'
 import { BigNumber, orderBNToString } from '../utils'
 import { Protocol } from '../types'
 import { ExtendedZXOrder, RemoteSigningPMMV5Request } from './types'
 import { Order as ZXOrder } from '0x-v2-order-utils'
+import { AbstractSigner } from '@toolchainx/ethers-gcp-kms-signer'
 
 export const EIP712_ORDER_SCHEMA = {
   name: 'Order',
@@ -62,7 +63,7 @@ export const generateSaltWithFeeFactor = (feeFactor: number, prefixSalt?: string
 // |  V   |    R    |    S    |userAddr |feeFactor|
 // +------|---------|---------|---------|---------+
 export async function signWithUserAndFee(
-  signer: Wallet,
+  signer: AbstractSigner,
   orderSignDigest: string,
   userAddr: string,
   feeFactor: number
@@ -92,7 +93,7 @@ export async function signWithUserAndFee(
 // +------|---------|---------|---------+
 // |  v   |    R    |    S    | type(3) |
 // +------|---------|---------|---------+
-export async function signByEOA(orderSignDigest: string, wallet: Wallet): Promise<string> {
+export async function signByEOA(orderSignDigest: string, wallet: AbstractSigner): Promise<string> {
   const hashArray = utils.arrayify(orderSignDigest)
   let signature = await wallet.signMessage(hashArray)
   signature = signature.slice(2)
@@ -111,7 +112,7 @@ export async function signByMMPSigner(
   orderSignDigest: string,
   userAddr: string,
   feeFactor: number,
-  wallet: Wallet
+  wallet: AbstractSigner
 ): Promise<string> {
   const walletSign = await signWithUserAndFee(wallet, orderSignDigest, userAddr, feeFactor)
   return signatureUtils.convertToSignatureWithType(walletSign, SignatureType.Wallet)
@@ -137,7 +138,7 @@ export const forwardUnsignedOrder = async (
 
 // Move fee factor to salt field
 export const buildSignedOrder = async (
-  signer: Wallet | undefined,
+  signer: AbstractSigner | undefined,
   order: ExtendedZXOrder,
   userAddr: string,
   chainId: number,
@@ -179,8 +180,9 @@ export const buildSignedOrder = async (
   console.log(`orderSignDigest: ${orderSignDigest}`)
   let makerWalletSignature
   if (!signingUrl) {
+    const signerAddress = await signer.getAddress()
     makerWalletSignature =
-      signer.address.toLowerCase() == o.makerAddress.toLowerCase()
+      signerAddress.toLowerCase() == o.makerAddress.toLowerCase()
         ? await signByEOA(orderSignDigest, signer)
         : await signByMMPSigner(orderSignDigest, userAddr, feeFactor, signer)
   } else {

src/signer/rfqv1.ts

@@ -1,4 +1,4 @@
-import { Wallet, utils } from 'ethers'
+import { utils } from 'ethers'
 import { orderBNToString, BigNumber } from '../utils'
 import { generateSaltWithFeeFactor, signWithUserAndFee } from './pmmv5'
 import { getOrderHash, getOrderSignDigest } from './orderHash'
@@ -7,6 +7,7 @@ import * as ethUtils from 'ethereumjs-util'
 import { SignatureType } from './types'
 import axios from 'axios'
 import { Protocol } from '../types'
+import { AbstractSigner } from '@toolchainx/ethers-gcp-kms-signer'
 
 // spec of RFQV1
 // - taker address point to userAddr
@@ -18,7 +19,7 @@ export async function signByMMPSigner(
   orderSignDigest: string,
   userAddr: string,
   feeFactor: number,
-  wallet: Wallet,
+  wallet: AbstractSigner,
   walletType: WalletType
 ): Promise<string> {
   if (walletType === WalletType.MMP_VERSION_4) {
@@ -73,7 +74,7 @@ export const signRFQOrder = async (
   chainId: number,
   rfqAddr: string,
   order: RFQOrder,
-  maker: Wallet,
+  maker: AbstractSigner,
   feeFactor = 30
 ): Promise<string> => {
   const domain = {
@@ -117,7 +118,7 @@ export const signRFQOrder = async (
 }
 
 export const buildSignedOrder = async (
-  signer: Wallet | undefined,
+  signer: AbstractSigner | undefined,
   order: ExtendedZXOrder,
   userAddr: string,
   chainId: number,
@@ -147,7 +148,8 @@ export const buildSignedOrder = async (
   console.log(`orderSignDigest: ${orderSignDigest}`)
   let makerWalletSignature
   if (!signingUrl) {
-    if (signer.address.toLowerCase() == order.makerAddress.toLowerCase()) {
+    const signerAddress = await signer.getAddress()
+    if (signerAddress.toLowerCase() == order.makerAddress.toLowerCase()) {
       const signatureTypedData = await signRFQOrder(
         chainId,
         rfqAddr,

src/signer/rfqv2.ts

@@ -1,4 +1,4 @@
-import { utils, Wallet } from 'ethers'
+import { utils } from 'ethers'
 import { orderBNToString } from '../utils'
 import { getOfferHash, getOfferSignDigest } from './orderHash'
 import {
@@ -15,6 +15,7 @@ import { generatePseudoRandomSalt } from '0x-v2-order-utils'
 import { signWithUserAndFee } from './pmmv5'
 import { Protocol } from '../types'
 import { BigNumber } from '0x-v2-utils'
+import { AbstractSigner } from '@toolchainx/ethers-gcp-kms-signer'
 
 // spec of RFQV2
 // - taker address point to userAddr
@@ -26,7 +27,7 @@ import { BigNumber } from '0x-v2-utils'
 // +------|---------|---------|-------------------|---------+
 // |  R   |    S    |    V    | reserved 32 bytes | type(3) |
 // +------|---------|---------|-------------------|---------+
-export async function signByEOA(orderSignDigest: string, wallet: Wallet): Promise<string> {
+export async function signByEOA(orderSignDigest: string, wallet: AbstractSigner): Promise<string> {
   // signature: R+S+V
   const hashArray = utils.arrayify(orderSignDigest)
   let signature = await wallet.signMessage(hashArray)
@@ -43,7 +44,7 @@ export async function signByMMPSigner(
   orderSignDigest: string,
   userAddr: string,
   feeFactor: number,
-  wallet: Wallet,
+  wallet: AbstractSigner,
   walletType: WalletType
 ): Promise<string> {
   if (walletType === WalletType.MMP_VERSION_4) {
@@ -98,7 +99,7 @@ export const signOffer = async (
   chainId: number,
   rfqAddr: string,
   order: Offer,
-  maker: Wallet,
+  maker: AbstractSigner,
   signatureType = SignatureType.EIP712
 ): Promise<string> => {
   const domain = {
@@ -133,7 +134,7 @@ export const signOffer = async (
 }
 
 export const buildSignedOrder = async (
-  signer: Wallet | undefined,
+  signer: AbstractSigner | undefined,
   order: ExtendedZXOrder,
   userAddr: string,
   chainId: number,
@@ -166,7 +167,8 @@ export const buildSignedOrder = async (
   console.log(`orderSignDigest: ${orderSignDigest}`)
   let makerWalletSignature
   if (!signingUrl) {
-    if (signer.address.toLowerCase() == order.makerAddress.toLowerCase()) {
+    const signerAddress = await signer.getAddress()
+    if (signerAddress.toLowerCase() == order.makerAddress.toLowerCase()) {
       makerWalletSignature = await signOffer(
         chainId,
         rfqAddr,

src/start.ts

@@ -74,12 +74,13 @@ export const startMMSK = async (config: ConfigForStart) => {
   setConfig(config)
   try {
     console.log(config.SIGNING_URL)
-    if (!config.SIGNING_URL) {
-      wallet = getWallet()
+    if (!config.SIGNING_URL && config.AMM_ONLY !== 'true') {
+      wallet = await getWallet()
       if (!wallet) {
         throw new Error(`Please set either WALLET_PRIVATE_KEY or SIGNING_URL`)
       }
-      if (wallet.address.toLowerCase() != config.WALLET_ADDRESS.toLowerCase()) {
+      const walletAddress = await wallet.getAddress()
+      if (walletAddress.toLowerCase() != config.WALLET_ADDRESS.toLowerCase()) {
         throw `wallet's address${wallet.address} and ${
           config.USE_KEYSTORE ? 'keystore' : 'privateKey'
         }(${config.WALLET_ADDRESS}) not matched`

src/types/index.ts

@@ -35,6 +35,7 @@ export interface ConfigForStart {
   EXCHANGE_URL: string
   PROVIDER_URL: string
   SIGNING_URL: string
+  AMM_ONLY: string
   PERMIT_TYPE: string
 
   WALLET_ADDRESS: string