Comment by contingencies

<non-cryptanalyst blather>It seems to me that in all but the most resource constrained systems any novel implementation of hashing for source file validation should be multi-algorithm by default, since typical processing overheads are minimal and IO is already paid for. (IO could/should be pseudorandom and non-linear, FWIW). Encryption however can be more complex and expensive and there could potentially be more risk of recombinant side channels.</non-cryptanalyst blather>