use base58check in fromString

lib/bip32.js

@@ -1,4 +1,5 @@
 var base58 = require('./base58');
+var Base58Check = require('./base58check');
 var Hash = require('./hash');
 var Keypair = require('./keypair');
 var Pubkey = require('./pubkey');
@@ -29,20 +30,8 @@ BIP32.prototype.fromRandom = function(networkstr) {
 };
 
 BIP32.prototype.fromString = function(str) {
-  var decoded = base58.decode(str);
-  if (decoded.length != 82)
-    throw new Error('Not enough data, expected 82 and received ' + decoded.length);
-  var checksum = decoded.slice(78, 82);
-  var bytes = decoded.slice(0, 78);
-
-  var hash = Hash.sha256sha256(bytes);
-
-  if (hash[0] != checksum[0] || hash[1] != checksum[1] || hash[2] != checksum[2] || hash[3] != checksum[3])
-    throw new Error('Invalid checksum');
-
-  if (bytes !== undefined && bytes !== null)
-    this.initFromBytes(bytes);
-
+  var bytes = Base58Check.decode(str);
+  this.initFromBytes(bytes);
   return this;
 };