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vfs/xoroshiro: add PRNG plugin using Xoroshiro128+ #5407

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cnuke opened this issue Dec 16, 2024 · 1 comment
Open

vfs/xoroshiro: add PRNG plugin using Xoroshiro128+ #5407

cnuke opened this issue Dec 16, 2024 · 1 comment
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@cnuke
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cnuke commented Dec 16, 2024

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@cnuke cnuke added the feature label Dec 16, 2024
cnuke added a commit to cnuke/genode that referenced this issue Dec 16, 2024
@cnuke
vfs/xoroshiro: add PRNG plugin using Xoroshiro128+
3db40db 
This plugin provides a PRNG based on the Xoroshiro128+ algorithm
that reseeds itself after a specific amount of state was consumed.

For more detailed information please take a look at its README in
'repos/os/src/lib/vfs/xoroshiro/README'.

Fixes genodelabs#5407.
cnuke added a commit to cnuke/genode that referenced this issue Dec 16, 2024
@cnuke
lx_emul/random: fix reseed reset
33aa1ed 
Issue genodelabs#5407.
cnuke added a commit to cnuke/genode that referenced this issue Dec 16, 2024
@cnuke
vfs/xoroshiro: add PRNG plugin using Xoroshiro128+
4ce1402 
This plugin provides a PRNG based on the Xoroshiro128+ algorithm
that reseeds itself after a specific amount of state was consumed.

For more detailed information please take a look at its README in
'repos/os/src/lib/vfs/xoroshiro/README'.

Fixes genodelabs#5407.
@cnuke
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cnuke commented Dec 16, 2024 •
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Commit 4ce1402 provides the plugin, the already available implementation in lx_emul/random.cc (*) served as a blue-print. Consolidating both implementations would be a follow-up task.

(*) Commit 33aa1ed address what looks like a copy & paste error in the original implementation. EDIT: missed the implicit reset during reseed.

My primary reason for creating the plugin is getting rid of the sub-init in the various web-browser packages where the jitter_sponge component was utilized because accessing vfs_jitterentropy directly was to slow IIRC.
The vfs_xoroshiro.run run-script allows for primitive testing and on my machine (T470p, 7440HQ) using base-linux in VBox6 yields around ~300 MiB/s when using vfs_jitterentropy and 1800 MiB/s when using vfs_zero.

Since I have not performed any analysis I cannot comment on security-related properties of the implementation or rather the algorithm itself.

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