commit 7f7783d0c0c726eaaf517125383b0fb30251bdd0
author Edwin Wong <edwinwong@google.com> Fri Oct 06 18:21:06 2017 -0700
committer android-build-team Robot <android-build-team-robot@google.com> Tue Nov 28 03:28:10 2017 +0000
tree b0d6c7b69e8bf88d9959d3cf0f494f7fad0317da
parent 7adb5f5abc09b9856267e1403b8f7992fae287e2

Validate decryption key length to decrypt function.

Cherry picked from http://go/ag/3038278.

AesCtrDecryptor::decrypt() doesn't check whether the size of "key"
is equal to 16 bytes,  which may lead to an OOB read problem in the
context of mediadrmserver.

Add DecryptsWithEmptyKey and DecryptsWithKeyTooLong unit tests.

Test: ClearKeyDrmUnitTest
  adb shell LD_LIBRARY_PATH="/vendor/lib/mediadrm"
  /data/nativetest/ClearKeyDrmUnitTest/ClearKeyDrmUnitTest

bug: 63982768
Change-Id: I1f22c9df2b051972b2c532608b7f203e3ce77926
(cherry picked from commit 379b672b189aa72ce0103b485019022f3e292c36)