Introduction
In this tutorial we learn how to install libapksig-java on Ubuntu 20.04.
What is libapksig-java
libapksig-java is:
apksig is a project which aims to simplify APK signing and checking
whether APK’s signatures should verify on Android. apksig supports
JAR signing (used by Android since day one) and APK Signature Scheme
v2 (supported since Android Nougat, API Level 24).
The key feature of apksig is that it knows about differences in APK
signature verification logic between different versions of the
Android platform. apksig can thus check whether a signed APK is
expected to verify on all Android platform versions supported by the
APK. When signing an APK, apksig will choose the most appropriate
cryptographic algorithms based on the Android platform versions
supported by the APK being signed.
apksig library offers three primitives:
-
ApkSigner which signs the provided APK so that it verifies on all
Android platform versions supported by the APK. The range of platform
versions can be customized if necessary. -
ApkVerifier which checks whether the provided APK is expected to
verify on all Android platform versions supported by the APK. The
range of platform versions can be customized if necessary. -
(Default)ApkSignerEngine which abstracts away signing an APK from
parsing and building an APK file. This is useful in optimized APK
building pipelines, such as in Android Plugin for Gradle, which need
to perform signing while building an APK, instead of after. For
simpler use cases where the APK to be signed is available upfront,
the ApkSigner above is easier to use.
NOTE: Some public classes of the library are in packages having the
word “internal” in their name. These are not public API of the
library. Do not use .internal. classes directly.
There are three methods to install libapksig-java on Ubuntu 20.04. We can use apt-get, apt and aptitude. In the following sections we will describe each method. You can choose one of them.
Install libapksig-java Using apt-get
Update apt database with apt-get using the following command.
sudo apt-get update
After updating apt database, We can install libapksig-java using apt-get by running the following command:
sudo apt-get -y install libapksig-java
Install libapksig-java Using apt
Update apt database with apt using the following command.
sudo apt update
After updating apt database, We can install libapksig-java using apt by running the following command:
sudo apt -y install libapksig-java
Install libapksig-java Using aptitude
If you want to follow this method, you might need to install aptitude first since aptitude is usually not installed by default on Ubuntu. Update apt database with aptitude using the following command.
sudo aptitude update
After updating apt database, We can install libapksig-java using aptitude by running the following command:
sudo aptitude -y install libapksig-java
How To Uninstall libapksig-java on Ubuntu 20.04
To uninstall only the libapksig-java package we can use the following command:
sudo apt-get remove libapksig-java
Uninstall libapksig-java And Its Dependencies
To uninstall libapksig-java and its dependencies that are no longer needed by Ubuntu 20.04, we can use the command below:
sudo apt-get -y autoremove libapksig-java
Remove libapksig-java Configurations and Data
To remove libapksig-java configuration and data from Ubuntu 20.04 we can use the following command:
sudo apt-get -y purge libapksig-java
Remove libapksig-java configuration, data, and all of its dependencies
We can use the following command to remove libapksig-java configurations, data and all of its dependencies, we can use the following command:
sudo apt-get -y autoremove --purge libapksig-java
References
Summary
In this tutorial we learn how to install libapksig-java package on Ubuntu 20.04 using different package management tools: apt, apt-get and aptitude.
