code: function(input) {
        if(!_finish) {
          // not finishing, so fill the input buffer with more input
          _input.putBuffer(input);
        }
  
        while(_input.length() >= 8) {
          runPlan([
              [ 5, mixRound ],
              [ 1, mashRound ],
              [ 6, mixRound ],
              [ 1, mashRound ],
              [ 5, mixRound ]
            ]);
        }
      }
docs: Updates the next block.
  
  @param input the buffer to read from.