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  TODO (tthsum tiger tree hash creator/verifier)       wjd, 2004-2009
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  Below is a list of possible improvements to tthsum.


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  Wishlist
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+ Provide a way to create digests of partial files. (Actually utilizing
  the properties of the Merkle tree.)
+ Enable selection of other hash methods, e.g. tiger4/192 (4 pass).
  (If we abstract the tiger_bp function away from the thex unit, check
  that passing function pointers does not decrease the hashing speed
  further.)
+ Optimize tthsum for common platforms. Unfortunately I know too little
  about either hashing functions or getting the most out of the CPU. So
  this is a bit out of my league. (The -march gcc option does not seem
  to be of much use. The misalignment that tiger_bp() accepts could be
  an issue, but adding memcpy to align it only slowed everything down.)


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