KeyDerivationFunction: example about treating data encrypted via SHA1PRNG

The Crypto provider providing the SHA1PRNG algorithm for random number
generation was deprecated.

This algorithm was sometimes incorrectly used to derive keys.

This example provides a helper class and shows how to treat data that
was encrypted in the incorrect way and re-encrypt it in a proper way.

Bug: 27873296

Change-Id: I92d2fd4ebb07d5823de31f5a199e23b1dba4836e
10 files changed