From 0b17c2bc3d3202f846282a1b0c2d22316de468b5 Mon Sep 17 00:00:00 2001
From: Daniel Cousens <github@dcousens.com>
Date: Mon, 16 Jun 2014 18:52:06 +1000
Subject: [PATCH] Transaction: re-adds getHash as a pure hash

---
 src/transaction.js  |  6 +++++-
 test/transaction.js | 15 ++++++++++++---
 2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/src/transaction.js b/src/transaction.js
index f99976e..0195067 100644
--- a/src/transaction.js
+++ b/src/transaction.js
@@ -193,8 +193,12 @@ Transaction.prototype.hashForSignature = function(prevOutScript, inIndex, hashTy
   return crypto.hash256(buffer)
 }
 
+Transaction.prototype.getHash = function () {
+  return crypto.hash256(this.toBuffer())
+}
+
 Transaction.prototype.getId = function () {
-  var buffer = crypto.hash256(this.toBuffer())
+  var buffer = this.getHash()
 
   // Big-endian is used for TxHash
   Array.prototype.reverse.call(buffer)
diff --git a/test/transaction.js b/test/transaction.js
index e93ea11..0ebf50a 100644
--- a/test/transaction.js
+++ b/test/transaction.js
@@ -56,12 +56,10 @@ describe('Transaction', function() {
     // Probably a bit representative of the API
     var prevTxHash, prevTxId, prevTx
     beforeEach(function() {
-      var crypto = require('../src/crypto')
-
       var f = fixtures.valid[0]
       prevTx = Transaction.fromHex(f.hex)
+      prevTxHash = prevTx.getHash()
       prevTxId = prevTx.getId()
-      prevTxHash = crypto.hash256(prevTx.toBuffer())
     })
 
     it('accepts a transaction id', function() {
@@ -195,6 +193,17 @@ describe('Transaction', function() {
     })
   })
 
+  describe('getHash', function() {
+    fixtures.valid.forEach(function(f) {
+      it('should return the hash for ' + f.txid, function() {
+        var tx = Transaction.fromHex(f.hex)
+        var actual = tx.getHash().toString('hex')
+
+        assert.equal(actual, f.hash)
+      })
+    })
+  })
+
   // TODO:
   //  hashForSignature: [Function],