0.upto(pass.length-1) do |i|
    tpass = pass.dup
    while ( tpass[i, 1].unpack("C*")[0] < 0x7c )
      tpass[i, 1] = [ tpass[i, 1].unpack("C*")[0] + 1 ].pack("C")
      bsum = vxworks_sum_from_pass(tpass)