tree 022a7b8126afdc6121a75b7572190a34ca394c9b
parent f5955b1cb44c0ced5983207c55f0013a4586b284
author Peter Cai <peter@typeblog.net> 1558619075 +0800
committer Peter Cai <peter@typeblog.net> 1558701672 +0800
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ext4crypt: support synthetic keys v3 on May update

Re-implemented SP800Derive in C++, which is added as the new key
derivation function in Android 9.0 May update. From file
services/core/java/com/android/server/locksettings/SP800Derive.java in
frameworks/base.

This is required to get TWRP working on any Android device that has a
screen lock set up after the May update.

Change-Id: I5c1a51b110033f2b0b75d5e36fd8098c05e95179