From 018d534c473be1fae2597c25d2d64e31696ae6e7 Mon Sep 17 00:00:00 2001
From: Christopher Jeffrey <chjjeffrey@gmail.com>
Date: Wed, 13 Jan 2016 20:05:25 -0800
Subject: [PATCH] fix anyonecanpay.

---
 lib/bcoin/tx.js | 33 +++++++++++++++------------------
 1 file changed, 15 insertions(+), 18 deletions(-)

diff --git a/lib/bcoin/tx.js b/lib/bcoin/tx.js
index 43e3fb08..301a4bd9 100644
--- a/lib/bcoin/tx.js
+++ b/lib/bcoin/tx.js
@@ -588,6 +588,7 @@ TX.prototype.getSubscript = function getSubscript(index) {
 
 TX.prototype.signatureHash = function signatureHash(index, s, type) {
   var copy = this.clone();
+  var inputIndex = index;
   var msg, hash;
 
   if (typeof index !== 'number')
@@ -599,28 +600,34 @@ TX.prototype.signatureHash = function signatureHash(index, s, type) {
   assert(type != null);
   assert(index < copy.inputs.length)
 
-  // bitcoind used to return 1 as an error code:
-  // it ended up being treated like a hash.
-  // if (index >= copy.inputs.length)
-  //   return constants.oneHash.slice();
+  if (type & constants.hashType.anyonecanpay) {
+    copy.inputs = [copy.inputs[inputIndex]];
+    inputIndex = 0;
+  }
 
   copy.inputs.forEach(function(input, i) {
-    input.script = i === index ? s : [];
+    input.script = i === inputIndex ? s : [];
   });
 
   if ((type & 0x1f) === constants.hashType.all) {
     ;
   } else if ((type & 0x1f) === constants.hashType.none) {
-    copy.outputs = [];
     copy.inputs.forEach(function(input, i) {
-      if (i !== index)
+      if (i !== inputIndex)
         input.seq = 0;
     });
+    copy.outputs = [];
   } else if ((type & 0x1f) === constants.hashType.single) {
-    // bitcoind sighash_single bug:
+    // Bitcoind used to return 1 as an error code:
+    // it ended up being treated like a hash.
     if (index >= copy.outputs.length)
       return constants.oneHash.slice();
 
+    copy.inputs.forEach(function(input, i) {
+      if (i !== inputIndex)
+        input.seq = 0;
+    });
+
     while (copy.outputs.length < index + 1)
       copy.outputs.push({});
 
@@ -633,20 +640,10 @@ TX.prototype.signatureHash = function signatureHash(index, s, type) {
         output.value = new bn('ffffffffffffffff', 'hex');
       }
     });
-
-    copy.inputs.forEach(function(input, i) {
-      if (i !== index)
-        input.seq = 0;
-    });
   } else {
     assert(false);
   }
 
-  if (type & constants.hashType.anyonecanpay) {
-    copy.inputs.length = 1;
-    copy.inputs[0].script = s;
-  }
-
   msg = copy.render(true);
 
   utils.writeU32(msg, type, msg.length);