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6a1061663f
Char.code (input_char chan) mod nr_chars has modulo bias because the original interval is not a multiple of the destination interval, i.e. 256 mod nr_chars != 0. One way to fix this is to keep generating random numbers until they fall outside the interval where modulo bias occurs, that is accept only c=[256 % nr_chars, 256). That interval maps back to [0, nr_chars), and has a length of (256 - 256 % nr_chars), which is a multiple of nr_chars. RWMJ: - Modify the code so it goes into a utility library. - Use the same code across virt-builder and virt-sysprep.