Added id to utils.

tests/run-utils.js

@@ -100,10 +100,20 @@ function testNamehash(test) {
     test.done();
 }
 
+function testId(test) {
+    var id = require('../utils/id');
+
+    var sig = id('setAddr(bytes32,address)').substring(0, 10);
+    test.equal(sig, '0xd5fa2b00', 'id("setAddr(bytes32,address)")')
+
+    test.done();
+}
+
 module.exports = {
     "address": testAddress,
     "contract-address": testContractAddress,
     'namehash': testNamehash,
+    'id': testId,
     "rlp-coder": testRLPCoder,
     "units": testUnits,
 }

utils/id.js

@@ -0,0 +1,10 @@
+'use strict';
+
+var keccak256 = require('./keccak256');
+var utf8 = require('./utf8');
+
+function id(text) {
+    return keccak256(utf8.toUtf8Bytes(text));
+}
+
+module.exports = id;

utils/index.js

@@ -7,6 +7,7 @@ var address = require('./address');
 var bigNumber = require('./bignumber');
 var contractAddress = require('./contract-address');
 var convert = require('./convert');
+var id = require('./id');
 var keccak256 = require('./keccak256');
 var namehash = require('./namehash');
 var sha256 = require('./sha2').sha256;
@@ -42,6 +43,7 @@ module.exports = {
     toUtf8String: utf8.toUtf8String,
 
     namehash: namehash,
+    id: id,
 
     getAddress: address.getAddress,
     getContractAddress: contractAddress.getContractAddress,

utils/package.json

@@ -1,6 +1,6 @@
 {
   "name": "ethers-utils",
-  "version": "2.1.1",
+  "version": "2.1.2",
   "description": "Utilities for the Ethers Ethereum library.",
   "bugs": {
     "url": "http://github.com/ethers-io/ethers.js/issues",