open-keychain/README.md

# OpenKeychain (for Android)

OpenKeychain is an OpenPGP implementation for Android.  
For a more detailed description and installation instructions go to http://www.openkeychain.org .

### Travis CI Build Status

[![Build Status](https://travis-ci.org/open-keychain/open-keychain.png?branch=master)](https://travis-ci.org/open-keychain/open-keychain)

## How to help the project?

### Translate the application

Translations are managed at Transifex, please contribute there at https://www.transifex.com/projects/p/open-keychain/

### Contribute Code

1. Join the development mailinglist at http://groups.google.com/d/forum/openpgp-keychain-dev
2. Lookout for interesting issues on our issue page at Github: https://github.com/open-keychain/open-keychain/issues
3. Tell us about your plans on the mailinglist
4. Read this README, especially the notes about coding style
5. Fork OpenKeychain and contribute code (the best part ;) )
6. Open a pull request on Github. I will help with occuring problems and merge your changes back into the main project.

I am happy about every code contribution and appreciate your effort to help us developing OpenKeychain!

## Development

Development mailinglist at http://groups.google.com/d/forum/openpgp-keychain-dev

### Build with Gradle

1. Get all external submodules with ``git submodule update --init --recursive``
2. Have Android SDK "tools", "platform-tools", and "build-tools" directories in your PATH (http://developer.android.com/sdk/index.html)
3. Open the Android SDK Manager (shell command: ``android``).  
Expand the Tools directory and select "Android SDK Build-tools (Version 21.1.1)".  
Expand the Extras directory and install "Android Support Repository"  
Select everything for the newest SDK Platform (API-Level 21)
4. Export ANDROID_HOME pointing to your Android SDK
5. Execute ``./gradlew build``
6. You can install the app with ``adb install -r OpenKeychain/build/outputs/apk/OpenKeychain-debug-unaligned.apk``

### Run Tests
1. Use OpenJDK instead of Oracle JDK
3. Execute ``./gradlew test``

### Build API Demo with Gradle

1. Follow 1-4 from above
2. The example code is available at https://github.com/open-keychain/api-example
3. Execute ``./gradlew build``

### Development with Android Studio

We are using the newest [Android Studio](http://developer.android.com/sdk/installing/studio.html) for development. Development with Eclipse is currently not possible because we are using the new [project structure](http://developer.android.com/sdk/installing/studio-tips.html).

1. Clone the project from Github
2. From Android Studio: File -> Import Project ->  Select the cloned top folder

## Libraries

### Bouncy Castle

#### Spongy Castle

Spongy Castle is the stock Bouncy Castle libraries with a couple of small changes to make it work on Android. OpenKeychain uses a forked version with some small changes. These changes will been sent to Bouncy Castle, and Spongy Castle will be used again when they have filtered down.

see
* Fork: https://github.com/openpgp-keychain/spongycastle
* Spongy Castle: http://rtyley.github.com/spongycastle/

#### Bouncy Castle resources

* Repository: https://github.com/bcgit/bc-java
* Issue tracker: http://www.bouncycastle.org/jira/browse/BJA

#### Documentation
* Documentation project at http://www.cryptoworkshop.com/guide/
* Tests in https://github.com/bcgit/bc-java/tree/master/pg/src/test/java/org/bouncycastle/openpgp/test
* Examples in https://github.com/bcgit/bc-java/tree/master/pg/src/main/java/org/bouncycastle/openpgp/examples
* Mailinglist Archive at http://bouncy-castle.1462172.n4.nabble.com/Bouncy-Castle-Dev-f1462173.html
* Commit changelog of pg subpackage: https://github.com/bcgit/bc-java/commits/master/pg

## Build System

We try to make our builds as [reproducible/deterministic](https://blog.torproject.org/blog/deterministic-builds-part-one-cyberwar-and-global-compromise) as possible.  

#### Update Gradle version
* Always use a fixed Android Gradle plugin version not a dynamic one, e.g. ``0.7.3`` instead of ``0.7.+`` (allows offline builds without lookups for new versions, also some minor Android plugin versions had serious issues, i.e. [0.7.2 and 0.8.1](http://tools.android.com/tech-docs/new-build-system))
* Update every build.gradle file with the new gradle version and/or gradle plugin version
    * build.gradle
    * OpenKeychain/build.gradle
* run ./gradlew wrapper twice to update gradle and download the new gradle jar file
* commit the corresponding [Gradle wrapper](http://www.gradle.org/docs/current/userguide/gradle_wrapper.html) to the repository (allows easy building for new contributors without the need to install the required Gradle version using a package manager)
  
#### Update SDK and Build Tools
* Open build.gradle and change:
```
ext {
    compileSdkVersion = 21
    buildToolsVersion = '21.1.2'
}
```
* Change SDK and Build Tools in git submodules "openkeychain-api-lib" and "openpgp-api-lib" manually. They should also build on their own without the ext variables.

#### Add new library
* You can add the library as a Maven dependency or as a git submodule (if patches are required) in the "extern" folder.
* If added as a Maven dependency, pin the library using [Gradle Witness](https://github.com/WhisperSystems/gradle-witness) (Do ``./gradlew -q calculateChecksums`` for Trust on First Use)
* If added as a git submodule, change the ``compileSdkVersion`` and ``buildToolsVersion`` in build.gradle to use the variables from the root project:
```
android {
    compileSdkVersion rootProject.ext.compileSdkVersion
    buildToolsVersion rootProject.ext.buildToolsVersion
}
```
* You can check for wrong ``compileSdkVersion`` by ``find -name build.gradle | xargs grep compileSdkVersion``

#### Slow Gradle?

* https://www.timroes.de/2013/09/12/speed-up-gradle/
* Disable Lint checking if it is enabled in build.gradle

#### Error:Configuration with name 'default' not found.

Gradle project dependencies are missing. Do a ``git submodule init && git submodule update``

#### Build on Mac OS X fails?

Try exporting JAVA_TOOL_OPTIONS="-Dfile.encoding=UTF8"

## Translations

Translations are hosted on Transifex, which is configured by ".tx/config".

1. To pull newest translations install transifex client (e.g. ``apt-get install transifex-client``)
2. Config Transifex client with "~/.transifexrc"
3. Go into root folder of git repo
4. execute ``tx pull`` (``tx pull -a`` to get all languages)

see http://help.transifex.net/features/client/index.html#user-client

## Coding Style

### Code
* Indentation: 4 spaces, no tabs
* Maximum line width for code and comments: 100
* Opening braces don't go on their own line
* Field names: Non-public, non-static fields start with m.
* Acronyms are words: Treat acronyms as words in names, yielding !XmlHttpRequest, getUrl(), etc.
* Fully Qualify Imports: Do *not* use wildcard-imports such as ``import foo.*;``

The full coding style can be found at http://source.android.com/source/code-style.html

### Automated syntax check with CheckStyle

#### Linux
1. Paste the `tools/checkstyle.xml` file to `~/.AndroidStudioPreview/config/codestyles/`
2. Go to Settings > Code Style > Java, select OpenPgpChecker, as well as Code Style > XML and select OpenPgpChecker again.
3. Start code inspection and see the results by selecting Analyze > Inspect Code from Android-Studio or you can directly run checkstyle via cli with `.tools/checkstyle`. Make sure it's executable first.

#### Mac OSX
1. Paste the `tools/checkstyle.xml` file to `~/Library/Preferences/AndroidStudioPreview/codestyles`
2. Go to Preferences > Code Style > Java, select OpenPgpChecker, as well as Code Style > XML and select OpenPgpChecker again.
3. Start code inspection and see the results by selecting Analyze > Inspect Code from Android-Studio or you can directly run checkstyle via cli with `.tools/checkstyle`. Make sure it's executable first.

#### Windows
1. Paste the `tools/checkstyle.xml` file to `C:\Users\<UserName>\.AndroidStudioPreview\config\codestyles`
2. Go to File > Settings > Code Style > Java, select OpenPgpChecker, as well as Code Style > XML and select OpenPgpChecker again.
3. Start code inspection and see the results by selecting Analyze > Inspect Code from Android-Studio.

## Licenses
OpenKechain is licensed under GPLv3+.
The full license text can be found in the [LICENSE file](https://github.com/open-keychain/open-keychain/blob/master/LICENSE).
Some parts and some libraries are Apache License v2, MIT X11 License (see below).

> This program is free software: you can redistribute it and/or modify
> it under the terms of the GNU General Public License as published by
> the Free Software Foundation, either version 3 of the License, or
> (at your option) any later version.
> 
> This program is distributed in the hope that it will be useful,
> but WITHOUT ANY WARRANTY; without even the implied warranty of
> MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> GNU General Public License for more details.
> 
> You should have received a copy of the GNU General Public License
> along with this program.  If not, see <http://www.gnu.org/licenses/>.


### Libraries

See https://github.com/open-keychain/open-keychain/blob/development/OpenKeychain/src/main/res/raw/help_about.html

### Images
* icon.svg  
  modified version of kgpg_key2_kopete.svgz
  
* Actionbar icons  
  http://developer.android.com/design/downloads/index.html#action-bar-icon-pack
  
* QR Code Actionbar icon  
  https://github.com/openintents/openintents/blob/master/extensions/qrcode_ext/icons/ic_menu_qr_code/ic_menu_qr_code_holo_light/ic_menu_qr_code.svg

* Key status icons by the ModernPGP working group  
  https://github.com/ModernPGP
  
* Purple color scheme  
  http://android-holo-colors.com/