tree d86236fb801b0b53d078ca13c30ddf5c9c6b624f
parent edd6bc95bbc71b94bd1d760c0ce8054cb521835f
author Gang Wang <wanggang@google.com> 1578417434 -0500
committer Siarhei Vishniakou <svv@google.com> 1581629224 -0800

Use hmac to sign events in InputDispatcher

InputDispatcher will now be able to sign events. Add two static methods
to InputDispatcher class, for signing events, and for checking the event
signature.

The new methods can verify whether a MotionEntry object was actually created by
the Input system and whether the MotionEntry object was modified
afterwards.

Bug: 134977432
Test: none

Change-Id: Ica11bccd0c3fb065b02634bd236ae5a46f6b19ee