On Sep 30, 2016, at 8:09 AM, Richard Weinberger <[email protected]> wrote: > > Hi, > > if I read the ext4 code correctly, you pass encrypted filenames to > ext4fs_dirhash(). > These filenames are not encoded and therefore binary gibberish. > Isn't this a problem for the ext4 hash functions? My fear is that these > hashes are optimized > for ASCII strings and produce more collisions when binary data is used as > input.
The default hash function (half-md4) is an (old) crypto hash and works fine with binary data. Some of the other hash functions are less strong, but I don't think anyone changes the hash function for ext4. Cheers, Andreas
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