| commit | c5bd203c87b7fa76572176a44437d66fa28f918e | [log] [tgz] |
|---|---|---|
| author | Michael Groover <mpgroover@google.com> | Thu Oct 07 17:29:58 2021 -0700 |
| committer | Michael Groover <mpgroover@google.com> | Fri Oct 08 17:49:11 2021 -0700 |
| tree | 685fb5c8697c8ea2a88455a7d8ce7040eb317e09 | |
| parent | f25dde795d091848ca28677289322644bd75be52 [diff] |
Add V4 signing tests to verify V3.1 support Android T introduced the V3.1 signature scheme to allow APK version targeting for key rotation; this scheme allows a single APK to support rotation on SDK version X for X >= Android T, while all previous releases will only see and use the original signing key. This requires the V4 signature to be updated to include both the rotated signing key when installed on a device running X+ as well as the original signing key for devices running a version < X. This commit adds two new tests to ensure the V4 signature contains the expected signer both when the V3.1 signature scheme is used as well as when only the V3.0 scheme is used for rotation. The V3.1 test is currently marked with @Ignore and should be re-enabled once the V4 scheme supports V3.1. Bug: 202011194 Test: gradlew test Change-Id: I4a4c43553c9e1e72c7b6d97c6b716ad57728666a
apksig is a project which aims to simplify APK signing and checking whether APK signatures are expected to 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). apksig is meant to be used outside of Android devices.
The key feature of apksig is that it knows about differences in APK signature verification logic between different versions of the Android platform. apksig thus thoroughly checks whether an APK's signature is expected to verify on all Android platform versions supported by the APK. When signing an APK, apksig chooses the most appropriate cryptographic algorithms based on the Android platform versions supported by the APK being signed.
The project consists of two subprojects:
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.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.(Default)ApkSignerEngine which abstracts away signing APKs from parsing and building APKs. 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 because these classes may change any time without regard to existing clients outside of apksig and apksigner.
apksigner command-line tool offers two operations:
apksigner sign for usage information.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.