commit | ff1aeed34686b95555bed796fa98b4650dfe95a8 | [log] [tgz] |
---|---|---|
author | Dan Cashman <dcashman@google.com> | Sun Jan 14 21:58:54 2018 -0800 |
committer | Dan Cashman <dcashman@google.com> | Mon Feb 26 16:49:30 2018 -0800 |
tree | 4c08ff0988c0db876a2da2d8e0aa06065bbc5ef2 | |
parent | ea8526ada853ebfdae188cc9fbbccdb6443f6284 [diff] |
Add SigningCertificateLineage to apksig. Add support for key rotation. The signer lineage contains a history of signing certificates with each ancestor attesting to the validity of its descendant. Each additional descendant represents a new identity that can be used to sign an APK. In this way, the lineage contains a proof of rotation by which the APK containing it can demonstrate, to other parties, its ability to be trusted with its current signing certificate, as though it were signed by one of its older ones. Each signing certificate also maintains flags which describe how the APK itself would like to trust the old certificates, if at all, when encountered. Bug: 64686581 Test: bazel test ... Change-Id: I0fbcc6ac5955db5cc9c5c77d472ba1fae39f866e
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.