From c7b9091da0c0d6bafc909c4d6f45e662e87cc61d Mon Sep 17 00:00:00 2001
From: Christopher Jeffrey <chjjeffrey@gmail.com>
Date: Thu, 30 Jun 2016 08:11:43 -0700
Subject: [PATCH] drop unoptimized sighashing.

---
 lib/bcoin/tx.js | 103 ------------------------------------------------
 1 file changed, 103 deletions(-)

diff --git a/lib/bcoin/tx.js b/lib/bcoin/tx.js
index 000104cb..6327feb3 100644
--- a/lib/bcoin/tx.js
+++ b/lib/bcoin/tx.js
@@ -480,109 +480,6 @@ TX.prototype.signatureHash = function signatureHash(index, prev, type, version)
  * @returns {Buffer}
  */
 
-TX.prototype.signatureHashCopy = function signatureHashV0(index, prev, type) {
-  var p = new BufferWriter();
-  var empty = new Script();
-  var i, copy, input, output;
-
-  if (typeof index !== 'number')
-    index = this.inputs.indexOf(index);
-
-  if (typeof type === 'string')
-    type = constants.hashType[type.toUpperCase()];
-
-  assert(index >= 0 && index < this.inputs.length);
-  assert(prev instanceof Script);
-
-  // Clone the transaction.
-  copy = new TX();
-
-  copy.version = this.version;
-
-  for (i = 0; i < this.inputs.length; i++) {
-    input = new bcoin.input();
-    input.prevout = this.inputs[i].prevout;
-    input.script = this.inputs[i].script;
-    input.sequence = this.inputs[i].sequence;
-    copy.inputs.push(input);
-  }
-
-  for (i = 0; i < this.outputs.length; i++) {
-    output = new bcoin.output();
-    output.value = this.outputs[i].value;
-    output.script = this.outputs[i].script;
-    copy.outputs.push(output);
-  }
-
-  copy.locktime = this.locktime;
-
-  // Remove all signatures.
-  for (i = 0; i < copy.inputs.length; i++)
-    copy.inputs[i].script = empty;
-
-  // Remove all code separators.
-  prev = prev.removeSeparators();
-
-  // Set our input to previous output's script
-  copy.inputs[index].script = prev;
-
-  if ((type & 0x1f) === constants.hashType.NONE) {
-    // Drop all outputs. We don't want to sign them.
-    copy.outputs.length = 0;
-
-    // Allow input sequence updates for other inputs.
-    for (i = 0; i < copy.inputs.length; i++) {
-      if (i !== index)
-        copy.inputs[i].sequence = 0;
-    }
-  } else if ((type & 0x1f) === constants.hashType.SINGLE) {
-    // Bitcoind used to return 1 as an error code:
-    // it ended up being treated like a hash.
-    if (index >= copy.outputs.length)
-      return utils.copy(constants.ONE_HASH);
-
-    // Drop all the outputs after the input index.
-    copy.outputs.length = index + 1;
-
-    // Null outputs that are not the at current input index.
-    for (i = 0; i < copy.outputs.length; i++) {
-      if (i !== index) {
-        copy.outputs[i].script = empty;
-        copy.outputs[i].value = -1;
-      }
-    }
-
-    // Allow input sequence updates for other inputs.
-    for (i = 0; i < copy.inputs.length; i++) {
-      if (i !== index)
-        copy.inputs[i].sequence = 0;
-    }
-  }
-
-  // Only sign our input. Allows anyone to add inputs.
-  if (type & constants.hashType.ANYONECANPAY) {
-    copy.inputs[0] = copy.inputs[index];
-    copy.inputs.length = 1;
-  }
-
-  // Render the copy and append the hashtype.
-  copy.toRaw(p);
-  p.writeU32(type);
-
-  return utils.hash256(p.render());
-};
-
-/**
- * Legacy sighashing -- O(n^2).
- * Note: Optimized version. No
- * transaction copy necessary.
- * @private
- * @param {Number} index
- * @param {Script} prev
- * @param {SighashType} type
- * @returns {Buffer}
- */
-
 TX.prototype.signatureHashV0 = function signatureHashV0(index, prev, type) {
   var i, input, output;
   var p = new BufferWriter();