From 7800128b9b7cf23c7dd915abe727d4db35e4491e Mon Sep 17 00:00:00 2001
From: olalonde <olalonde@gmail.com>
Date: Mon, 5 May 2014 18:59:55 +0800
Subject: [PATCH] Armory: from master public key

---
 examples/Armory.js | 19 +++++++++++++++++++
 lib/Armory.js      |  6 ++++++
 2 files changed, 25 insertions(+)

diff --git a/examples/Armory.js b/examples/Armory.js
index 1e11ac4..713cd8b 100644
--- a/examples/Armory.js
+++ b/examples/Armory.js
@@ -45,3 +45,22 @@ for (var i = 0; i < 5; i++) {
   console.log(Address.fromPubKey(a.pubkey).as('base58'));
   a = a.next();
 }
+
+
+var mpk = '045a09a3286873a72f164476bde9d1d8e5c2bc044e35aa47eb6e798e325a86417f7c35b61d9905053533e0b4f2a26eca0330aadf21c638969e45aaace50e4c0c8784ac14bc4b388b33da099a0b4ee3b507284d99e1476639e36e5ca5e6af86481e';
+
+console.log('');
+console.log('');
+console.log('Deriving public keys for');
+console.log('------------------------');
+console.log('Master Public Key: %s', mpk);
+console.log('');
+
+// skip first public key
+var b = Armory.fromMasterPublicKey(mpk).next();
+
+for (var i = 0; i < 5; i++) {
+  console.log(Address.fromPubKey(b.pubkey).as('base58'));
+  b = b.next();
+}
+
diff --git a/lib/Armory.js b/lib/Armory.js
index 6cdb220..4d9194f 100644
--- a/lib/Armory.js
+++ b/lib/Armory.js
@@ -41,6 +41,12 @@ Armory.prototype.next = function () {
   return new Armory(this.chaincode, next_pubkey);
 };
 
+Armory.fromMasterPublicKey = function (mpk) {
+  var pubkey = mpk.substr(0, 130);
+  var chaincode = mpk.substr(130, mpk.length);
+  return new Armory(chaincode, pubkey);
+};
+
 function decode (str) {
   var from = '0123456789abcdef';
   var to = 'asdfghjkwertuion';