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bit bashing

   used to describe any of several kinds of low-level programming
   characterized by manipulation of bit, flag, nybble,
   and other smaller-than-character-sized pieces of data; these
   include low-level device control, encryption algorithms, checksum
   and error-correcting codes, hash functions, some flavors of
   graphics programming (see bitblt), and assembler/compiler code
   generation.  May connote either tedium or a real technical
   challenge (more usually the former).  "The command decoding for
   the new tape driver looks pretty solid but the bit-bashing for the
   control registers still has bugs."  See also bit bang,
   mode bit.