[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3594: Add a direct test for the streaming behavior of EncryptAnUploadable.read_encrypted

[Tahoe-LAFS]

#3594: Add a direct test for the streaming behavior of
EncryptAnUploadable.read_encrypted
---------------------+---------------------------
 Reporter:  exarkun  |          Owner:
     Type:  defect   |         Status:  new
 Priority:  normal   |      Milestone:  undecided
Component:  unknown  |        Version:  n/a
 Keywords:           |  Launchpad Bug:
---------------------+---------------------------
 EncryptAnUploadable should (and does) encrypt the uploadable as a stream
 of data.  If the underlying encryption protocol has a block size (and it
 does, AES128 has a block size of 16 bytes) then this has no bearing on the
 results of `read_encrypted`.

 Put another way, reading 16 bytes should produce the same string as
 reading 8 bytes twice and concatenating them.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3594>
Tahoe-LAFS <https://Tahoe-LAFS.org>
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