first commit

.gitignore

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+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+**/ios/Flutter/.last_build_id
+.dart_tool/
+.flutter-plugins
+.flutter-plugins-dependencies
+.packages
+.pub-cache/
+.pub/
+/build/
+
+# Web related
+lib/generated_plugin_registrant.dart
+
+# Symbolication related
+app.*.symbols
+
+# Obfuscation related
+app.*.map.json
+
+# Android Studio will place build artifacts here
+/android/app/debug
+/android/app/profile
+/android/app/release
+
+android/app/.cxx

.metadata

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+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: 4d7946a68d26794349189cf21b3f68cc6fe61dcb
+  channel: stable
+
+project_type: app

LICENSE

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+MIT License
+
+Copyright (c) 2021 Clarence K.C. Ho
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+![image](https://user-images.githubusercontent.com/13360325/116012081-3924ca80-a5dd-11eb-89ab-9c8543302d7b.png)
+
+# AndSafe
+
+AndSafe is an Android app that encrypts plain text notes. With version 3, AndSafe3 is re-implemented with Flutter and is now open source.
+
+## FAQ
+**I can't remember my password. Can you help me?**
+
+Sorry. There is no backdoor to recover lost passwords.
+
+**How to backup my notes?**
+
+AndSafe has no netowork function and hence it won't sync anything to cloud. You are encouraged to backup your notes off your phone regularly. Use the *Export notes* function to backup all notes into a file. Then copy the file to your computer as a backup.
+
+Note that although exported notes are in encrypted form, you should still safeguard the backup file.
+
+**Where are my exported notes?**
+
+For AndSafe v2, notes are export to the folder *AndroidSafeExports* under your internal storage of your phone. For AndSafe3, it is under the app folder itself, e.g. */storage/emulated/0/Android/data/net.clarenceho.andsafe3/files/Documents*.
+
+Note that for AndSafe3, if you uninstall the app, you will also delete all exported files.
+
+**I used previous version of AndSafe. Can I import my notes into AndSafe3?**
+
+AndSafe3 can import notes from AndSafe version 2 but not the other way around. Just export your notes in AndSafe, then open AndSafe3 and use the import function.
+
+**The search function isn't working**
+
+The full-text search can only match from beginning of whole word. For example, if the title is "Password for foobar.com", it can be found by searching "foo" / "com" / "pass" but not by "bar".
+
+That is the limitation of the database search feature and to be backward compatible with older Android devices. Maybe in the future we can utilize another search engine.
+
+## Technical FAQ
+**What encryption algorithm is used?**
+
+AndSafe uses AES in CBC mode with 256 bits key, which is generated by scrypt. AES implementation in Dart is by [Pointy Castle](https://pub.dev/packages/pointycastle). To improve performance, scrypt is using a native C implementation by [Colin Percival](https://github.com/Tarsnap/scrypt).
+
+**Why each note is encrypted with a different key? Why not just use a single master key for all notes?**
+
+The original AndSafe v1 (called AndroidSafe back then) had a feature to share individual encrypted note. Hence it needed to use the password to derive the encryption key for each note.
+And that is why it take time to change password or importing notes, as the key needs to be generated for each note for encryption / decryption.
+
+## Acknowledgement
+- App icon: from [DelliPack](https://www.smashingmagazine.com/2008/07/55-free-high-quality-icon-sets/#dellipack), by [Wendell Fernandes](http://dellustrations.deviantart.com/)
+

android/.gitignore

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+gradle-wrapper.jar
+/.gradle
+/captures/
+/gradlew
+/gradlew.bat
+/local.properties
+GeneratedPluginRegistrant.java
+
+# Remember to never publicly share your keystore.
+# See https://flutter.dev/docs/deployment/android#reference-the-keystore-from-the-app
+key.properties

android/app/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.4.1)
+
+add_library(crypto_scrypt
+            # as a shared library
+            SHARED
+            # source files
+            src/main/native/crypto_scrypt-nosse.c src/main/native/sha256.c)
+
+target_compile_definitions (crypto_scrypt PUBLIC HAVE_CONFIG_H)
+

android/app/build.gradle

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+def localProperties = new Properties()
+def localPropertiesFile = rootProject.file('local.properties')
+if (localPropertiesFile.exists()) {
+    localPropertiesFile.withReader('UTF-8') { reader ->
+        localProperties.load(reader)
+    }
+}
+
+def flutterRoot = localProperties.getProperty('flutter.sdk')
+if (flutterRoot == null) {
+    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
+}
+
+def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
+if (flutterVersionCode == null) {
+    flutterVersionCode = '1'
+}
+
+def flutterVersionName = localProperties.getProperty('flutter.versionName')
+if (flutterVersionName == null) {
+    flutterVersionName = '1.0'
+}
+
+apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
+
+def keystoreProperties = new Properties()
+def keystorePropertiesFile = rootProject.file('key.properties')
+if (keystorePropertiesFile.exists()) {
+    keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
+}
+
+android {
+    compileSdkVersion 30
+
+    sourceSets {
+        main.java.srcDirs += 'src/main/kotlin'
+    }
+
+    defaultConfig {
+        applicationId "net.clarenceho.andsafe3"
+        minSdkVersion 19
+        targetSdkVersion 30
+        versionCode flutterVersionCode.toInteger()
+        versionName flutterVersionName
+    }
+
+    signingConfigs {
+        release {
+            keyAlias keystoreProperties['keyAlias']
+            keyPassword keystoreProperties['keyPassword']
+            storeFile keystoreProperties['storeFile'] ? file(keystoreProperties['storeFile']) : null
+            storePassword keystoreProperties['storePassword']
+        }
+    }
+    buildTypes {
+        release {
+            signingConfig signingConfigs.release
+        }
+    }
+    externalNativeBuild {
+        // Encapsulates your CMake build configurations.
+        cmake {
+            // Provides a relative path to your CMake build script.
+            path "CMakeLists.txt"
+        }
+    }
+}
+
+flutter {
+    source '../..'
+}
+
+dependencies {
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+}

android/app/src/debug/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="net.clarenceho.andsafe">
+    <!-- Flutter needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

android/app/src/main/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="net.clarenceho.andsafe">
+   <application
+        android:label="AndSafe3"
+        android:icon="@mipmap/ic_launcher">
+        <activity
+            android:name=".MainActivity"
+            android:launchMode="singleTop"
+            android:theme="@style/LaunchTheme"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize">
+            <!-- Specifies an Android theme to apply to this Activity as soon as
+                 the Android process has started. This theme is visible to the user
+                 while the Flutter UI initializes. After that, this theme continues
+                 to determine the Window background behind the Flutter UI. -->
+            <meta-data
+              android:name="io.flutter.embedding.android.NormalTheme"
+              android:resource="@style/NormalTheme"
+              />
+            <!-- Displays an Android View that continues showing the launch screen
+                 Drawable until Flutter paints its first frame, then this splash
+                 screen fades out. A splash screen is useful to avoid any visual
+                 gap between the end of Android's launch screen and the painting of
+                 Flutter's first frame. -->
+            <!-- this is causing error in older android. https://github.com/flutter/gallery/issues/383
+            <meta-data
+              android:name="io.flutter.embedding.android.SplashScreenDrawable"
+              android:resource="@drawable/launch_background"
+              />-->
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+        <!-- Don't delete the meta-data below.
+             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
+        <meta-data
+            android:name="flutterEmbedding"
+            android:value="2" />
+    </application>
+</manifest>

android/app/src/main/kotlin/net/clarenceho/andsafe/MainActivity.kt

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+package net.clarenceho.andsafe
+
+import io.flutter.embedding.android.FlutterActivity
+
+class MainActivity: FlutterActivity() {
+}

android/app/src/main/native/config.h

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+#define HAVE_DECL_BE64ENC 0
+#define HAVE_MMAP 1
+
+#ifndef __ANDROID__
+#define HAVE_POSIX_MEMALIGN 1
+#endif
+
+#ifdef __ANDROID__
+#include <sys/limits.h>
+#endif