Mark 0 length files as corrupt
Files created by keystore should never be 0 length however a vendor ran
into such a case when testing their keymaster and a side effect of how
keystore parses files leads to these keys being considered encrypted and
ulitmately undeletable.
Now mark 0 length files as corrupt in readKey and when deleting a key if
the key fails to read in because it was corrupt simply rm the file since
it is not possible to feed the key blob to keymaster's delete method.
Bug: 22561219
Change-Id: Ie8c1ffe97d1d89c202cdab7a6b4b5efc914cbbff
1 file changed