[PATCH 5/5] crypt_make_salt(): try to use actual random bytes for salt generation

[Steffen Nurpmeso]

Rasmus Villemoes wrote in
 <20240415125628.780178-6-rasmus.villemoes at prevas.dk>:
 |Instead of limiting the possible generated salts to 2^32 different
 |ones, try to get some actual random bits and mix those in. Keep the
 |old pseudo-random generation in place, so that even if
 |open_read_close() fails or only returns a partial result, we're not
 |doing any worse than previously.
 |
 |In fact, even with /dev/urandom being unavailable, this might still
 |improve things a bit since whatever sort-of random content might be in
 |the p buffer on entry is then mixed in.

By that time i thought (completely unrelated with your work) that
the code from miscutils/seedrng.c which has a more broad view of
where to get random data from should possibly be generalized.
There are more than just one match for /dev/urandom, and they all
want some random bits.

--steffen
|
|Der Kragenbaer,                The moon bear,
|der holt sich munter           he cheerfully and one by one
|einen nach dem anderen runter  wa.ks himself off
|(By Robert Gernhardt)