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gerrit-public.fairphone.software / platform / tools / apksig / 80f23dbc0df2f940ff344e12e05ed188e3faa860
commit80f23dbc0df2f940ff344e12e05ed188e3faa860[log] [tgz]
authorAlex Klyubin <klyubin@google.com>Tue Jul 25 20:54:44 2017 +0000
committerandroid-build-merger <android-build-merger@google.com>Tue Jul 25 20:54:44 2017 +0000
tree795adfa08208dd1098d4476d72264877d3b6ec13
parent6e652e415a5fad57e2961cedfc34cce1a9ae6c8c [diff]
parentc4e8bd15039f4e21b0c13d56b3835effbc42bff3 [diff]
Fix typo in "apksigner sign" help page am: 843d09e2fc am: cd2ec081c8 am: f715f4b694 am: d1afba324b
am: c4e8bd1503

Change-Id: I532cfddcdf57255d9c7989967b18d3d3f4244353
tree: 795adfa08208dd1098d4476d72264877d3b6ec13
  1. etc/
  2. src/
  3. Android.mk
  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.