The previously used "memset(ptr, 0, size)" can get optimized away by compilers
if "ptr" is not used afterwards.
A new class "ZeroOnFreeBuffer" is introduced that can hold sensitive data and
that automatically clears underlying memory when it's no longer used.
Bug: webrtc:8806, webrtc:8897, webrtc:8905
Change-Id: Iedddddf80790f9af0addaab3346ec5bff102917d
Reviewed-on: https://webrtc-review.googlesource.com/41941
Commit-Queue: Joachim Bauch <jbauch@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22334}
Various places are using "memset(ptr, 0, size)" which might get optimized
away by the compiler if "ptr" is not used afterwards. The new functions
can be used to securely clear memory instead.
Bug: None
Change-Id: I067a51d17ff84d95dc4934d46a24027fbcb4825d
Reviewed-on: https://webrtc-review.googlesource.com/35500
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Joachim Bauch <jbauch@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21706}
