crypto_toolbox

This is copy of the crypto_toolbox for GD usage.
Only necessary changes were made:
* removed dependency on bt_types.h
* removed dependency on libbase
* reformatted code
* added namespace

Further improvements will be stacked on top of this patch.

Test: CryptoToolboxTest
Bug: 132863815
Change-Id: I639ba42705b23218a14085abcf431d744f87b913