fixed exception when trying to read binary keyfile. https://github.com/authpass/authpass/issues/59

lib/src/kdbx_format.dart

@@ -65,8 +65,8 @@ abstract class CredentialsPart {
 
 class KeyFileCredentials implements CredentialsPart {
   factory KeyFileCredentials(Uint8List keyFileContents) {
-    final keyFileAsString = utf8.decode(keyFileContents);
     try {
+      final keyFileAsString = utf8.decode(keyFileContents);
       if (_hexValuePattern.hasMatch(keyFileAsString)) {
         return KeyFileCredentials._(ProtectedValue.fromBinary(
             convert.hex.decode(keyFileAsString) as Uint8List));

test/kdbx4_test.dart

@@ -79,6 +79,15 @@ void main() {
       final pwd = firstEntry.getString(KdbxKey('Password')).getText();
       expect(pwd, 'def');
     });
+    test('Binary Keyfile', () async {
+      final data =
+          await File('test/keyfile/BinaryKeyFilePasswords.kdbx').readAsBytes();
+      final keyFile =
+          await File('test/keyfile/binarykeyfile.key').readAsBytes();
+      final file = kdbxFormat.read(data,
+          Credentials.composite(ProtectedValue.fromString('asdf'), keyFile));
+      expect(file.body.rootGroup.entries, hasLength(1));
+    });
   });
   group('Writing', () {
     test('Create and save', () {

test/keyfile/binarykeyfile.key

@@ -0,0 +1 @@
+À!š¢OÅ“‡¥¿
Å8!Wȸ9É&Å78!AÿÈõûâw5›EÕ<EFBFBD>|ØŒu£®j™”²sïEòën(ŒØðvó$6?rg‘:Wjºø/¥O­6ÏÝ]“m´Œk…hxWk•ænÍ<EFBFBD>…"x{¾IÑjêé…vÎõ—ù2