add Address.forKey convenience method and example vanity address generator

examples/VanityAddress.js

@@ -0,0 +1,28 @@
+'use strict';
+
+
+var run = function() {
+  // Replace '../bitcore' with 'bitcore' if you use this code elsewhere.
+  var bitcore = require('../bitcore');
+  var Key = bitcore.Key;
+  var Address = bitcore.Address;
+
+  // config your regular expression
+  var re = /[0-9]{6}$/; // ends in 6 digits
+
+  var a,k,m;
+  while (true) {
+    k = Key.generateSync();
+    a = Address.forKey(k);
+    m = a.toString().match(re);
+    if (m) break;
+  }
+  console.log('Address: '+a.toString());
+  console.log('Private Key: '+k.private.toString('hex'));
+
+};
+
+module.exports.run = run;
+if (require.main === module) {
+  run();
+}

lib/Address.js

@@ -12,12 +12,12 @@ function Address() {
 Address.parent = parent;
 parent.applyEncodingsTo(Address);
 
-//create a pubKeyHash address
+// create a pubKeyHash address
 Address.fromPubKey = function(pubKey, network) {
   if (!network)
     network = 'livenet';
 
-  if (pubKey.length != 33 && pubKey.length != 65)
+  if (pubKey.length !== 33 && pubKey.length !== 65)
     throw new Error('Invalid public key');
 
   var version = networks[network].addressVersion;
@@ -26,6 +26,11 @@ Address.fromPubKey = function(pubKey, network) {
   return new Address(version, hash);
 };
 
+// create an address from a Key object
+Address.forKey = function(key, network) {
+  return Address.fromPubKey(key.public, network);
+};
+
 //create a p2sh m-of-n multisig address
 Address.fromPubKeys = function(mReq, pubKeys, network, opts) {
   if (!network)

test/test.Address.js

@@ -5,15 +5,11 @@ var bitcore = bitcore || require('../bitcore');
 
 var should = chai.should();
 
-var AddressModule = bitcore.Address;
-var Address;
+var Address = bitcore.Address;
+var Key = bitcore.Key;
 
 describe('Address', function() {
-  it('should initialze the main object', function() {
-    should.exist(AddressModule);
-  });
   it('should be able to create class', function() {
-    Address = AddressModule;
     should.exist(Address);
   });
   it('should be able to create instance', function() {
@@ -84,13 +80,24 @@ describe('Address', function() {
   });
 
   describe('#fromPubKey', function() {
-    it('should make this pubkeyhash address from uncompressed this public key', function() {
+    it('should make pubkeyhash address from an uncompressed public key', function() {
       var pubkey = new Buffer('04fa05ce8b25010cb6e17a30e0b66668bf083c40687547748ec330ee77adf53a42abd3d26148cbacfcf79c907ddefeb2c37f8bebc0a695ba79d634449d871de218', 'hex');
       var hash = bitcore.util.sha256ripe160(pubkey);
       var addr = new Address(0, hash);
       addr.toString().should.equal(Address.fromPubKey(pubkey).toString());
     });
   });
+  describe('#forKey', function() {
+    it('should make this pubkeyhash address from uncompressed this public key', function() {
+      var k = new Key();
+      k.private = new Buffer('43532455C88590A594D552F76DDB70EC1CFD7746F05C10CBB70B1EA9552EDF87', 'hex');
+      k.compressed = true;
+      k.regenerateSync();
+      var a = Address.forKey(k);
+      a.toString().should.equal('1L8k7WpWHMNkqVPTaZhzFU5VaWyjZEK7mD');
+    });
+  });
+
 
   describe('#fromPubKeys', function() {
     it('should make this p2sh multisig address from these pubkeys', function() {