At some point IV parameter has been removed making these functions
dangerous to use unless keys are unique on every message. Since the
functions were added the original consumer has disappeared too. With
no more users it's better to get rid of the incomplete encryption system
entirely.
These were the only functions using pycrypto module directly, so it was
also removed from the dependency list.
Fixes bug: 1033178
Change-Id: I57b0a0a42dac455d5baae3d726aea1507121aa4d
(cherry picked from commit 56d3d29ad2)
e8ef050bd3