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Feat: password generator add show entropy #361

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Feat: password generator add show entropy #361

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3 changes: 2 additions & 1 deletion authpass/lib/l10n/app_en.arb
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Original file line number Diff line number Diff line change
Expand Up @@ -1751,5 +1751,6 @@
},
"googleDriveMorePermissionsRequired": "Additional permissions needed to access Google Drive.",
"googleDriveRequestPermissionButtonLabel": "Request Permissions",
"scanQrCodeTitle": "Scan QR Code."
"scanQrCodeTitle": "Scan QR Code.",
"entropy": "Entropy:"
}
23 changes: 21 additions & 2 deletions authpass/lib/ui/screens/password_generator.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@ import 'package:authpass/ui/widgets/primary_button.dart';
import 'package:authpass/ui/widgets/slide_hide_widget.dart';
import 'package:authpass/utils/constants.dart';
import 'package:authpass/utils/extension_methods.dart';
import 'package:authpass/utils/password_entropy_calculator.dart';
import 'package:authpass/utils/password_generator.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
Expand Down Expand Up @@ -94,6 +95,7 @@ class _GeneratePasswordState extends State<GeneratePassword> {
String? _password;
int? _passwordLength = 20;
final _passwordLengthCustom = TextEditingController();
double _entropy = 0;

@override
void initState() {
Expand All @@ -120,6 +122,16 @@ class _GeneratePasswordState extends State<GeneratePassword> {
_password = PasswordGenerator.singleton().generatePassword(
CharacterSetCollection(_selectedCharacterSet.toList()),
_passwordLength!);
_entropy = PasswordEntropyCalculator.calculate(
passwordLength: _passwordLength!,
charSetSize: _selectedCharacterSet
.toList(growable: false)
.whereNotNull()
.fold<int>(
0,
(previousValue, element) => previousValue + element.length,
),
);
});
}

Expand All @@ -140,8 +152,8 @@ class _GeneratePasswordState extends State<GeneratePassword> {
ClipboardData(text: _password ?? CharConstants.empty));
ScaffoldMessenger.of(context)
..hideCurrentSnackBar(reason: SnackBarClosedReason.remove)
..showSnackBar(
SnackBar(content: Text(loc.copiedToClipboard)));
..showSnackBar(SnackBar(
content: Text(loc.copiedToClipboard))); // NON-NLS
},
child: InputDecorator(
decoration: InputDecoration(
Expand All @@ -161,6 +173,13 @@ class _GeneratePasswordState extends State<GeneratePassword> {
),
),
),
if (_entropy != 0)
Padding(
padding: const EdgeInsets.only(left: 16, bottom: 8),
child: Text(
'${loc.entropy} ${_entropy.toStringAsFixed(2)}', // NON-NLS
),
),
SimpleGridWidget(
children: _characterSets.entries
.map<Widget>(
Expand Down
12 changes: 12 additions & 0 deletions authpass/lib/utils/password_entropy_calculator.dart
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Original file line number Diff line number Diff line change
@@ -0,0 +1,12 @@
import 'dart:math';

class PasswordEntropyCalculator {
// entropy = passLength * log2(charSetSizd)
static double calculate({
required int passwordLength,
required int charSetSize,
}) {
double logBase(num x, num base) => log(x) / log(base);
return passwordLength * logBase(charSetSize, 2);
}
}