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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has been replaced by calls to RtlGenRandom.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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The condition to detect the end of the environment string was wrong.
Don't bother calculating the MD5SUM of the environment, just XOR
the bytes into the data.
This reduces bloat by 320 bytes but only in the non-default case.
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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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It appears that uninitialised static variables are placed in the
data section rather than bss, increasing the size of the binary.
Rewrite some code to reduce the amount of static data.
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