Add possibility to select compression of WIF for Private Key

lib/privatekey.js

@@ -300,27 +300,49 @@ PrivateKey.prototype.toString = function() {
 };
 
 /**
- * Will output the PrivateKey to a WIF string
+ * Will output the PrivateKey to a WIF string leading to compressed Public Key form
  *
  * @returns {string} A WIP representation of the private key
  */
-PrivateKey.prototype.toWIF = function() {
+PrivateKey.prototype.toCompressedWIF = function() {
   var network = this.network;
   var compressed = this.compressed;
 
-  var buf;
-  if (compressed) {
-    buf = Buffer.concat([Buffer.from([network.privatekey]),
-                         this.bn.toBuffer({size: 32}),
-                         Buffer.from([0x01])]);
-  } else {
-    buf = Buffer.concat([Buffer.from([network.privatekey]),
-                         this.bn.toBuffer({size: 32})]);
-  }
+  var buf = Buffer.concat([new Buffer([network.privatekey]),
+                          this.bn.toBuffer({size: 32}),
+                          new Buffer([0x01])]);
 
   return Base58Check.encode(buf);
 };
 
+/**
+ * Will output the PrivateKey to a WIF string leading to uncompressed Public Key form
+ *
+ * @returns {string} A WIP representation of the private key
+ */
+PrivateKey.prototype.toUncompressedWIF = function() {
+  var network = this.network;
+  var compressed = this.compressed;
+
+  var buf = Buffer.concat([Buffer.from([network.privatekey]),
+                          this.bn.toBuffer({size: 32})]);
+
+  return Base58Check.encode(buf);
+};
+
+/**
+ * Will output the PrivateKey to a WIF string
+ *
+ * @returns {string} A WIP representation of the private key
+ */
+PrivateKey.prototype.toWIF = function() {
+  if (this.compressed) {
+    return this.toCompressedWIF();
+  } else {
+    return this.toUncompressedWIF();
+  }
+};
+
 /**
  * Will return the private key as a BN instance
  *