[PATCH v9] seedrng: import SeedRNG utility for kernel RNG seed files

[Ron Yorston]

Jason A. Donenfeld wrote:
>Oh interesting. I wonder what's different about your
>config/compiler... I guess that means we can change the menuconfig
>entry to say (1.8k) instead.

My understanding is that the applet sizes reported in config are
to be generated by running the make_single_applets.sh and
size_single_applets.sh scripts.

Bloatcheck tells us the incremental cost of the patch versus a fully
configured build whereas the scripts report the cost of creating a
single-applet binary relative to the minimum possible single-applet
binary.  The latter cost will be (roughly) the size reported by
bloatcheck plus any dependent code it pulls in beyond that required
by the minimal applet.

For current git on my system I get "seedrng (8.3 kb)".

The comments in size_single_applets.sh say that a 32-bit build should
be used:

   # CONFIG_STATIC is not set
   CONFIG_CROSS_COMPILER_PREFIX=""
   CONFIG_EXTRA_CFLAGS="-m32"
   CONFIG_EXTRA_LDFLAGS="-m32"

However, this configuration failed to link due to problems with the
recent hardware accelerated SHA1/SHA256 code.  So I edited the config
to include:

   # CONFIG_SHA1_HWACCEL is not set
   # CONFIG_SHA256_HWACCEL is not set

Cheers,

Ron