| commit | 5ad09993f99a61cdf5b336f79dc0bfb0bd47b6ec | [log] [tgz] |
|---|---|---|
| author | Michael Groover <mpgroover@google.com> | Sun Jul 26 19:52:34 2020 -0700 |
| committer | Michael Groover <mpgroover@google.com> | Mon Jul 27 12:40:49 2020 -0700 |
| tree | 19dc585fe2fc7b9b2ee1db4998893ddf7b1cc6f9 | |
| parent | cc639ba38824d95b1031269621a80893acc0fa93 [diff] |
Add API to verify source stamp signature
This commit adds support to verify just the source stamp signature in
an APK without performing full signature verification. A client can
use the apksig library to verify just the source stamp as follows:
ApkVerifier apkVerifier = new ApkVerifier.Builder(inputApk)
.setMinCheckedPlatformVersion(minSdkVersion)
.setMaxCheckedPlatformVersion(maxSdkVersion)
.build();
ApkVerifier.Result result =
apkVerifier.verifySourceStamp(expectedCertDigest);
// If result#isVerified does not return true then the source stamp
// verification failed.
if (!result.isVerified()) {
ApkVerifier.Result.SourceStampInfo.SourceStampVerificationStatus
status =
result.getSourceStampInfo().getSourceStampVerificationStatus();
// Client specific behavior based on the status of the source stamp
// verification as defined in
// ApkVerifier.Result.SourceStampInfo.SourceStampVerificationStatus.
for (ApkVerifier.IssueWithParams error : result.getAllErrors()) {
// log each error as appropriate
}
}
Bug: 162188996
Test: gradlew test
Change-Id: I4675e9c50b0f4f9b0fd58aa9fbc15c9ee0313864
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.