From a154e248ae4648d64960b699913bed910d1d0a8d Mon Sep 17 00:00:00 2001
From: Joseph Poon <joseph@lightning.network>
Date: Wed, 16 Dec 2015 10:50:05 -0800
Subject: [PATCH] Taking a look...

---
 wallet/shachain/hash_chain.go      | 18 ++++++++++++++++++
 wallet/shachain/hash_chain_test.go |  2 ++
 2 files changed, 20 insertions(+)

diff --git a/wallet/shachain/hash_chain.go b/wallet/shachain/hash_chain.go
index 4c3a8e52d..9fbab7c25 100644
--- a/wallet/shachain/hash_chain.go
+++ b/wallet/shachain/hash_chain.go
@@ -1,8 +1,10 @@
 package wallet
 
 import "github.com/btcsuite/btcd/wire"
+import "fmt" //TODO(j) remove me later...
 
 // TODO(roasbeef): port Rusty's hash-chain stuff
+//http://ccodearchive.net/info/crypto/shachain.html
 //  * or just use HD chains based off of CodeShark's proposal?
 
 // chainFragment...
@@ -18,9 +20,25 @@ type ShaChain struct {
 	chainFragments []chainFragment
 }
 
+func Derive(from uint64, to uint64, fromHash wire.ShaHash, toHash wire.ShaHash) {
+	var branches uint64
+	branches = from ^ to
+
+	//TODO(j) remove me Dumb test
+	fmt.Println(branches)
+	fmt.Println(from)
+	fmt.Println(to)
+}
+
+//Generate a new ShaChain from a seed
+func NewShaChainFromSeed(seed wire.ShaHash, index uint64, hash wire.ShaHash) {
+	Derive(0, ^uint64(0), seed, hash)
+}
+
 // NewShaChain...
 func NewShaChain(seed wire.ShaHash) *ShaChain {
 	// TODO(roasbeef): from/to or static size?
+	return new(ShaChain)
 }
 
 // NextHash...
diff --git a/wallet/shachain/hash_chain_test.go b/wallet/shachain/hash_chain_test.go
index 23a750732..d876cb18b 100644
--- a/wallet/shachain/hash_chain_test.go
+++ b/wallet/shachain/hash_chain_test.go
@@ -1 +1,3 @@
 package wallet
+
+import "testing"