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gerrit-public.fairphone.software / platform / tools / apksig / 4a9193cf5009963c5779413b97043cf2712d9c62
commit4a9193cf5009963c5779413b97043cf2712d9c62[log] [tgz]
authorAlex Klyubin <klyubin@google.com>Fri Dec 08 17:58:24 2017 +0000
committerandroid-build-merger <android-build-merger@google.com>Fri Dec 08 17:58:24 2017 +0000
treec5a19a473509889ae31aa8768059a9c478fb5828
parentd8bcd0411112683aca92e50db21914541cdc95d2 [diff]
parent2b150f1fd8f4abeab2b01f657200650667997fa5 [diff]
Create publicly visible apksig-all target am: 1337ba2e13
am: 2b150f1fd8

Change-Id: I5ec4e6f35a1af3d59e3c83da15e4ac9376f63ac9
tree: c5a19a473509889ae31aa8768059a9c478fb5828
  1. etc/
  2. src/
  3. Android.bp
  4. android_plugin_for_gradle.gradle
  5. apksig.iml
  6. BUILD
  7. build.gradle
  8. LICENSE
  9. OWNERS
  10. README.md
README.md

apksig

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.

The project consists of two subprojects:

  • apksig -- a pure Java library, and
  • apksigner -- a pure Java command-line tool based on the apksig library.

apksig library

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.

apksigner command-line tool

apksigner command-line tool offers two operations:

  • sign the provided APK so that it verifies on all Android platforms supported by the APK. Run apksigner sign for usage information.
  • check whether the provided APK's signatures are expected to verify on all Android platforms supported by the APK. Run apksigner verify for usage information.

The tool determines the range of Android platform versions (API Levels) supported by the APK by inspecting the APK's AndroidManifest.xml. This behavior can be overridden by specifying the range of platform versions on the command-line.