Verify incoming signature.

Bug: 307288067
Bug: 480126173
Test: atest ChecksumsTest
(cherry picked from commit 7250d76a8a2d501af62081d88545c301d43106a4)
Cherrypick-From: https://googleplex-android-review.googlesource.com/q/commit:a7e0aa104cf198e3d4e7e3699e0fe18905324726
Merged-In: Iea181bfa387f64ec58f8245b096010c3a1f48adf
Change-Id: Iea181bfa387f64ec58f8245b096010c3a1f48adf
2 files changed