lib/hdkey: cleaned up serialize()

lib/hdkey.js

@@ -182,30 +182,20 @@ HDKey.fromMasterSeed = function(seedBuffer, versions) {
 }
 
 function serialize(hdkey, version, key) {
-    var buffer = new Buffer(LEN)
-
-    // 4 bytes: version bytes
-    buffer.writeUInt32BE(version, 0)
-
-    // Depth
-    // 1 byte: depth: 0x00 for master nodes, 0x01 for level-1 descendants, ....
-    buffer.writeUInt8(hdkey.depth, 4)
-
-    // 4 bytes: the fingerprint of the parent's key (0x00000000 if master key)
-    var fingerprint = hdkey.depth ? hdkey.parentFingerprint : 0x00000000
-    buffer.writeUInt32BE(fingerprint, 5)
-
-    // 4 bytes: child number. This is the number i in xi = xpar/i, with xi the key being serialized.
-    // This is encoded in Big endian. (0x00000000 if master key)
-    buffer.writeUInt32BE(hdkey.index, 9)
-
-    // 32 bytes: the chain code
-    hdkey.chainCode.copy(buffer, 13)
-
-    // 0x00 + k for private keys
-    key.copy(buffer, 45)
-
-    return buffer
+  // => version(4) || depth(1) || fingerprint(4) || index(4) || chain(32) || key(33) 
+  var buffer = new Buffer(LEN)
+  
+  buffer.writeUInt32BE(version, 0)
+  buffer.writeUInt8(hdkey.depth, 4)
+  
+  var fingerprint = hdkey.depth ? hdkey.parentFingerprint : 0x00000000
+  buffer.writeUInt32BE(fingerprint, 5)
+  buffer.writeUInt32BE(hdkey.index, 9)
+  
+  hdkey.chainCode.copy(buffer, 13)
+  key.copy(buffer, 45)
+
+  return buffer
 }
 
 function hash160(buf) {