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It appears that RtlGenRandom() wasn't supported in 32-bit builds
using mingw-w64 until version 7.0.0 (Fedora 33). Use the time to
initialise the PRNG in earlier versions.
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busybox-w32 provides two PRNG implementations which are used in
the emulation of /dev/urandom. The ad hoc method of seeding them
has been replaced by calls to RtlGenRandom.
The documentation for RtlGenRandom indicates it has been deprecated
in favour of CryptGenRandom. The documentation for the latter
indicates it has been deprecated in favour of the 'Cryptography Next
Generation APIs'. Nonetheless, RtlGenRandom remains available in
every version of Windows since XP.
In the unlikely event that RtlGenRandom fails simply use the current
time as the seed.
Saves 192 bytes in the default configuration.
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Save a few bytes:
- When collecting entropy prefer functions we call elsewhere.
- In uname(2) set 32-bit processor type to i686 and tweak it for
i386.
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Allow either ISAAC or the shell's built-in pseudo-random number
generator to be used for /dev/urandom. The latter is smaller so
it's the default.
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