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Android Studio Example Project

This is an example Android Studio project file for wolfssljni / wolfJSSE. This project should be used for reference only.

Tool and version information used when testing this project:

  • Ubuntu 20.04.3 LTS
  • Android Studio Chipmunk 2021.2.1
  • Android Gradle Plugin Version: 4.2.2
  • Gradle Version: 7.1.3
  • API 30: Android 11
  • Emulator: Pixel 5 API 31

The following sections outline steps required to run this example on an Android device or emulator.

1. Add Native wolfSSL Library Source Code to Project

This example project is already set up to compile and build the native wolfSSL library source files, but the wolfSSL files themselves have not been included in this package. You must download or link an appropriate version of wolfSSL to this project using one of the options below.

The project looks for the directory wolfssljni/IDE/Android/app/src/main/cpp/wolfssl for wolfSSL source code. This can added in multiple ways:

  • OPTION A: Download the latest wolfSSL library release from www.wolfssl.com, unzip it, rename it to wolfssl, and place it in the direcotry wolfssljni/IDE/Android/app/src/main/cpp/.
$ unzip wolfssl-X.X.X.zip
$ mv wolfssl-X.X.X wolfssljni/IDE/Android/app/src/main/cpp/wolfssl
  • OPTION B: Alternatively GitHub can be used to clone wolfSSL:
$ cd /IDE/Android/app/src/main/cpp/
$ git clone https://github.com/wolfssl/wolfssl
$ cp wolfssl/options.h.in wolfssl/options.h
  • OPTION C: A symbolic link to a wolfssl directory on the system by using:
$ cd /IDE/Android/app/src/main/cpp/
$ ln -s /path/to/local/wolfssl ./wolfssl

2. Update Java Symbolic Links (Only applies to Windows Users)

The following Java source directory is a Unix/Linux symlink:

wolfssljni/IDE/Android/app/src/main/java/com/wolfssl

This will not work correctly on Windows, and a new Windows symbolic link needs to be created in this location. To do so:

  1. Open Windows Command Prompt (Right click, and "Run as Administrator")
  2. Navigate to wolfssljni\IDE\Android\app\src\main\java\com
  3. Delete the existing symlink file (it shows up as a file called "wolfssl")
del wolfssl
  1. Create a new relative symbolic link with mklink:
mklink /D wolfssl ..\..\..\..\..\..\..\src\java\com\wolfssl\

3. Convert Example JKS files to BKS for Android Use

On an Android device BKS format key stores are expected. To convert the JKS example bundles to BKS use the following commands. Note: you will need to download a version of the bcprov JAR from the Bouncy Castle website:

cd examples/provider
./convert-to-bks.sh <path/to/provider>

For exmaple, when using bcprov-ext-jdk15on-169.jar:

cd examples/provider
./convert-to-bks.sh ~/Downloads/bcprov-ext-jdk15on-169.jar

4. Push BKS files to Android Device or Emulator

Push BKS bundles up to the device along with certificates. To do this start up the emulator/device and use adb push. An example of this would be the following commands from root wolfssljni directory. This step may be done after the starting Android Studio and compiling the project, but must be done before running the app or test cases.

adb shell
cd sdcard
mkdir examples
mkdir examples/provider
mkdir examples/certs
exit
adb push ./examples/provider/*.bks /sdcard/examples/provider/
adb push ./examples/certs/ /sdcard/examples/
adb push ./examples/certs/intermediate/* /sdcard/examples/certs/intermediate/

5. Import and Build the Example Project with Android Studio

  1. Open the Android Studio project by double clicking on the Android folder in wolfssljni/IDE/. Or, from inside Android Studio, open the Android project located in the wolfssljni/IDE directory.

  2. Build the project and run MainActivity from app -> java/com/example.wolfssl. This will ask for permissions to access the certificates in the /sdcard/ directory and then print out the server certificate information on success.

  3. OPTIONAL: The androidTests can be run after permissions have been given. app->java->com.wolfssl->provider.jsse.test->WolfSSLJSSETestSuite and app->java->com.wolfssl->test->WolfSSLTestSuite. In order to get the correct permissions, you may need to install and run the app first, before running the tests. Otherwise you will see EACCESS errors when trying to open example certificate and .bks files.

Support

Please contact wolfSSL support at [email protected] with any questions or feedback.