Add EIP-155 support

Author: ihordiachenko

index.js

@@ -359,15 +359,16 @@ exports.importPublic = function (publicKey) {
  * ECDSA sign
  * @param {Buffer} msgHash
  * @param {Buffer} privateKey
+ * @param {Number} [chainId]
  * @return {Object}
  */
-exports.ecsign = function (msgHash, privateKey) {
+exports.ecsign = function (msgHash, privateKey, chainId) {
   const sig = secp256k1.sign(msgHash, privateKey)
 
   const ret = {}
   ret.r = sig.signature.slice(0, 32)
   ret.s = sig.signature.slice(32, 64)
-  ret.v = sig.recovery + 27
+  ret.v = chainId ? sig.recovery + (chainId * 2 + 35) : sig.recovery + 27
   return ret
 }
 
@@ -390,12 +391,13 @@ exports.hashPersonalMessage = function (message) {
  * @param {Number} v
  * @param {Buffer} r
  * @param {Buffer} s
+ * @param {Number} [chainId]
  * @return {Buffer} publicKey
  */
-exports.ecrecover = function (msgHash, v, r, s) {
+exports.ecrecover = function (msgHash, v, r, s, chainId) {
   const signature = Buffer.concat([exports.setLength(r, 32), exports.setLength(s, 32)], 64)
-  const recovery = v - 27
-  if (recovery !== 0 && recovery !== 1) {
+  const recovery = calculateSigRecovery(v, chainId)
+  if (!isValidSigRecovery(recovery)) {
     throw new Error('Invalid signature v value')
   }
   const senderPubKey = secp256k1.recover(msgHash, signature, recovery)
@@ -407,12 +409,13 @@ exports.ecrecover = function (msgHash, v, r, s) {
  * @param {Number} v
  * @param {Buffer} r
  * @param {Buffer} s
+ * @param {Number} [chainId]
  * @return {String} sig
  */
-exports.toRpcSig = function (v, r, s) {
-  // NOTE: with potential introduction of chainId this might need to be updated
-  if (v !== 27 && v !== 28) {
-    throw new Error('Invalid recovery id')
+exports.toRpcSig = function (v, r, s, chainId) {
+  let recovery = calculateSigRecovery(v, chainId)
+  if (!isValidSigRecovery(recovery)) {
+    throw new Error('Invalid signature v value')
   }
 
   // geth (and the RPC eth_sign method) uses the 65 byte format used by Bitcoin
@@ -561,18 +564,19 @@ exports.addHexPrefix = function (str) {
  * @param {Buffer} r
  * @param {Buffer} s
  * @param {Boolean} [homestead=true]
+ * @param {Number} [chainId]
  * @return {Boolean}
  */
 
-exports.isValidSignature = function (v, r, s, homestead) {
+exports.isValidSignature = function (v, r, s, homestead, chainId) {
   const SECP256K1_N_DIV_2 = new BN('7fffffffffffffffffffffffffffffff5d576e7357a4501ddfe92f46681b20a0', 16)
   const SECP256K1_N = new BN('fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141', 16)
 
   if (r.length !== 32 || s.length !== 32) {
     return false
   }
 
-  if (v !== 27 && v !== 28) {
+  if (!isValidSigRecovery(calculateSigRecovery(v, chainId))) {
     return false
   }
 
@@ -711,3 +715,11 @@ exports.defineProperties = function (self, fields, data) {
     }
   }
 }
+
+function calculateSigRecovery (v, chainId) {
+  return chainId ? v - (2 * chainId + 35) : v - 27
+}
+
+function isValidSigRecovery (recovery) {
+  return recovery === 0 || recovery === 1
+}

test/index.js

@@ -475,6 +475,7 @@ describe('baToJSON', function () {
 
 var echash = Buffer.from('82ff40c0a986c6a5cfad4ddf4c3aa6996f1a7837f9c398e17e5de5cbd5a12b28', 'hex')
 var ecprivkey = Buffer.from('3c9229289a6125f7fdf1885a77bb12c37a8d3b4962d936f7e3084dece32a3ca1', 'hex')
+var chainId = 3 // ropsten
 
 describe('ecsign', function () {
   it('should produce a signature', function () {
@@ -483,13 +484,28 @@ describe('ecsign', function () {
     assert.deepEqual(sig.s, Buffer.from('129ff05af364204442bdb53ab6f18a99ab48acc9326fa689f228040429e3ca66', 'hex'))
     assert.equal(sig.v, 27)
   })
+
+  it('should produce a signature for Ropsten testnet', function () {
+    var sig = ethUtils.ecsign(echash, ecprivkey, chainId)
+    assert.deepEqual(sig.r, Buffer.from('99e71a99cb2270b8cac5254f9e99b6210c6c10224a1579cf389ef88b20a1abe9', 'hex'))
+    assert.deepEqual(sig.s, Buffer.from('129ff05af364204442bdb53ab6f18a99ab48acc9326fa689f228040429e3ca66', 'hex'))
+    assert.equal(sig.v, 41)
+  })
 })
 
 describe('ecrecover', function () {
   it('should recover a public key', function () {
     var r = Buffer.from('99e71a99cb2270b8cac5254f9e99b6210c6c10224a1579cf389ef88b20a1abe9', 'hex')
     var s = Buffer.from('129ff05af364204442bdb53ab6f18a99ab48acc9326fa689f228040429e3ca66', 'hex')
-    var pubkey = ethUtils.ecrecover(echash, 27, r, s)
+    var v = 27
+    var pubkey = ethUtils.ecrecover(echash, v, r, s)
+    assert.deepEqual(pubkey, ethUtils.privateToPublic(ecprivkey))
+  })
+  it('should recover a public key (chainId = 3)', function () {
+    var r = Buffer.from('99e71a99cb2270b8cac5254f9e99b6210c6c10224a1579cf389ef88b20a1abe9', 'hex')
+    var s = Buffer.from('129ff05af364204442bdb53ab6f18a99ab48acc9326fa689f228040429e3ca66', 'hex')
+    var v = 41
+    var pubkey = ethUtils.ecrecover(echash, v, r, s, chainId)
     assert.deepEqual(pubkey, ethUtils.privateToPublic(ecprivkey))
   })
   it('should fail on an invalid signature (v = 21)', function () {
@@ -546,7 +562,14 @@ describe('isValidSignature', function () {
   it('should work otherwise', function () {
     var r = Buffer.from('99e71a99cb2270b8cac5254f9e99b6210c6c10224a1579cf389ef88b20a1abe9', 'hex')
     var s = Buffer.from('129ff05af364204442bdb53ab6f18a99ab48acc9326fa689f228040429e3ca66', 'hex')
-    assert.equal(ethUtils.isValidSignature(27, r, s), true)
+    var v = 27
+    assert.equal(ethUtils.isValidSignature(v, r, s), true)
+  })
+  it('should work otherwise(chainId=3)', function () {
+    var r = Buffer.from('99e71a99cb2270b8cac5254f9e99b6210c6c10224a1579cf389ef88b20a1abe9', 'hex')
+    var s = Buffer.from('129ff05af364204442bdb53ab6f18a99ab48acc9326fa689f228040429e3ca66', 'hex')
+    var v = 41
+    assert.equal(ethUtils.isValidSignature(v, r, s, false, chainId), true)
   })
   // FIXME: add homestead test
 })