144 lines
3.8 KiB
C#
144 lines
3.8 KiB
C#
/*
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This file is part of Keepass2Android, Copyright 2013 Philipp Crocoll. This file is based on Keepassdroid, Copyright Brian Pellin.
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Keepass2Android is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Keepass2Android is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Keepass2Android. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System;
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using System.Globalization;
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using Android.Content;
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using Android.OS;
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using Android.Views;
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using Android.Widget;
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using Android.Preferences;
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using KeePassLib;
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using Android.Util;
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using KeePassLib.Cryptography.KeyDerivation;
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namespace keepass2android.settings
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{
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/// <summary>
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/// Represents the setting for the number of key transformation rounds. Changing this requires to save the database.
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/// </summary>
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public class RoundsPreference : DialogPreference {
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internal TextView RoundsView;
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protected override View OnCreateDialogView() {
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View view = base.OnCreateDialogView();
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RoundsView = (TextView) view.FindViewById(Resource.Id.rounds);
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ulong numRounds = KeyEncryptionRounds;
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RoundsView.Text = numRounds.ToString(CultureInfo.InvariantCulture);
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return view;
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}
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public ulong KeyEncryptionRounds
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{
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get
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{
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AesKdf kdf = new AesKdf();
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if (!kdf.Uuid.Equals(App.Kp2a.GetDb().KpDatabase.KdfParameters.KdfUuid))
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return (uint) PwDefs.DefaultKeyEncryptionRounds;
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else
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{
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ulong uRounds = App.Kp2a.GetDb().KpDatabase.KdfParameters.GetUInt64(
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AesKdf.ParamRounds, PwDefs.DefaultKeyEncryptionRounds);
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uRounds = Math.Min(uRounds, 0xFFFFFFFEUL);
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return (uint) uRounds;
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}
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}
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set { App.Kp2a.GetDb().KpDatabase.KdfParameters.SetUInt64(AesKdf.ParamRounds, value); }
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}
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public RoundsPreference(Context context, IAttributeSet attrs):base(context, attrs) {
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}
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public RoundsPreference(Context context, IAttributeSet attrs, int defStyle): base(context, attrs, defStyle) {
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}
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protected override void OnDialogClosed(bool positiveResult) {
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base.OnDialogClosed(positiveResult);
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if ( positiveResult ) {
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ulong rounds;
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String strRounds = RoundsView.Text;
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if (!(ulong.TryParse(strRounds,out rounds)))
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{
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Toast.MakeText(Context, Resource.String.error_rounds_not_number, ToastLength.Long).Show();
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return;
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}
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if ( rounds < 1 ) {
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rounds = 1;
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}
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Database db = App.Kp2a.GetDb();
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ulong oldRounds = KeyEncryptionRounds;
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if (oldRounds == rounds)
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{
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return;
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}
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KeyEncryptionRounds = rounds;
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Handler handler = new Handler();
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SaveDb save = new SaveDb(Context, App.Kp2a, new AfterSave(Context, handler, oldRounds, this));
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ProgressTask pt = new ProgressTask(App.Kp2a, Context, save);
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pt.Run();
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}
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}
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private class AfterSave : OnFinish {
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private readonly ulong _oldRounds;
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private readonly Context _ctx;
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private readonly RoundsPreference _pref;
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public AfterSave(Context ctx, Handler handler, ulong oldRounds, RoundsPreference pref):base(handler) {
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_pref = pref;
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_ctx = ctx;
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_oldRounds = oldRounds;
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}
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public override void Run() {
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if ( Success ) {
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if ( _pref.OnPreferenceChangeListener != null ) {
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_pref.OnPreferenceChangeListener.OnPreferenceChange(_pref, null);
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}
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} else {
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DisplayMessage(_ctx);
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App.Kp2a.GetDb().KpDatabase.KdfParameters.SetUInt64(AesKdf.ParamRounds, _oldRounds);
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}
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base.Run();
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}
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}
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}
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}
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