save private keys in base58 format

...to allow them to be imported into other wallets, preserving the "compressed"
or "uncompressed" state of the public key in the private key representation.

WalletKey.js

@@ -4,6 +4,7 @@ function ClassSpec(b) {
 	var coinUtil = require('./util/util');
 	var timeUtil = require('./util/time');
 	var KeyModule = require('./Key');
+	var PrivateKey = require('./PrivateKey').class();
 	var Address = require('./Address').class();
 
 	function WalletKey(cfg) {
@@ -21,9 +22,10 @@ function ClassSpec(b) {
 		var pubKey = this.privKey.public.toString('hex');
 		var pubKeyHash = coinUtil.sha256ripe160(this.privKey.public);
 		var addr = new Address(this.network.addressPubkey, pubKeyHash);
+		var priv = new PrivateKey(this.network.keySecret, this.privKey.private, this.privKey.compressed);
 		var obj = {
 			created: this.created,
-			priv: this.privKey.private.toString('hex'),
+			priv: priv.toString(),
 			pub: pubKey,
 			addr: addr.toString(),
 		};
@@ -34,10 +36,18 @@ function ClassSpec(b) {
 	WalletKey.prototype.fromObj = function(obj) {
 		this.created = obj.created;
 		this.privKey = new KeyModule.Key();
-		this.privKey.private = new Buffer(obj.priv, 'hex');
+		if (obj.priv.length==64) {
+			this.privKey.private = new Buffer(obj.priv,'hex');
+			this.privKey.compressed = true;
+		}
+		else {
+			var priv = new PrivateKey(obj.priv);
+			this.privKey.private = new Buffer(priv.payload());
+			this.privKey.compressed = priv.compressed();
+		}
+		this.privKey.regenerateSync();
 	};
 
 	return WalletKey;
 };
 module.defineClass(ClassSpec);
-