HDKeys: Added toObject method and changed toJSON to return a string

lib/hdprivatekey.js

@@ -406,7 +406,7 @@ HDPrivateKey.prototype.toString = function() {
  *
  *  @return {Object}
  */
-HDPrivateKey.prototype.toJSON = function() {
+HDPrivateKey.prototype.toObject = function toObject() {
   return {
     network: Network.get(BufferUtil.integerFromBuffer(this._buffers.version)).name,
     depth: BufferUtil.integerFromSingleByteBuffer(this._buffers.depth),
@@ -420,6 +420,10 @@ HDPrivateKey.prototype.toJSON = function() {
   };
 };
 
+HDPrivateKey.prototype.toJSON = function toJSON() {
+  return JSON.stringify(this.toObject());
+};
+
 HDPrivateKey.DefaultDepth = 0;
 HDPrivateKey.DefaultFingerprint = 0;
 HDPrivateKey.DefaultChildIndex = 0;

lib/hdpublickey.js

@@ -366,7 +366,7 @@ HDPublicKey.prototype.toString = function () {
  *  * xpubkey: the string with the base58 representation of this extended key
  *  * checksum: the base58 checksum of xpubkey
  */
-HDPublicKey.prototype.toJSON = function () {
+HDPublicKey.prototype.toObject = function toObject() {
   return {
     network: Network.get(BufferUtil.integerFromBuffer(this._buffers.version)).name,
     depth: BufferUtil.integerFromSingleByteBuffer(this._buffers.depth),
@@ -380,6 +380,10 @@ HDPublicKey.prototype.toJSON = function () {
   };
 };
 
+HDPublicKey.prototype.toJSON = function toJSON() {
+  return JSON.stringify(this.toObject());
+};
+
 HDPublicKey.Hardened = 0x80000000;
 HDPublicKey.RootElementAlias = ['m', 'M'];