Alex Klyubin a72b55195c Obtain entropy later in crypto operations, when possible.
This makes Android Keystore crypto operations defer pulling entropy
from provided SecureRandom until KeyStore.finish, where appropriate.
Such as when performing asymmetric encryption or generating
signatures.

Bug: 18088752
Change-Id: I4a897754e9a846214cf0995c5514f98cf0edd76b
2015-06-12 10:35:46 -07:00
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