Brian Warner 553367d567 download: make plaintext and ciphertext hashes in the UEB optional.
Removing the plaintext hashes can help with the guess-partial-information
attack. This does not affect compatibility, but if and when we actually
remove any hashes from the share, that will introduce a 
forwards-compatibility break: tahoe-0.9 will not be able to read such files.
2008-03-23 14:46:49 -07:00
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