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random: add xoshiro128++ PRNG source

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Adds an implementation of xoshiro128++ as a pseudo random number
generator from https://prng.di.unimi.it/ that operates on 32bit words.

The algorithm postfix signifies the main operation in the generation
function. Therefore xoshiro++ is chosen over xoshiro** as we would
prefer to do 2 additions isntead of 2 multiplications on embedded
hardware. The quality of the generators appears to be the same in all
other respects.

xoshiro+ is not chosen despite being faster as it generates random
floating-point values, not general purpose random values (The lower 4
bits are linear).

Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>
This commit is contained in:
Jordan Yates 2021-07-25 17:45:10 +10:00 • committed by Carles Cufí
commit 688fc737a8
3 changed files with 127 additions and 2 deletions
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6
subsys/random/CMakeLists.txt
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@ -2,7 +2,8 @@
if (CONFIG_ENTROPY_DEVICE_RANDOM_GENERATOR OR
CONFIG_TIMER_RANDOM_GENERATOR OR
CONFIG_XOROSHIRO_RANDOM_GENERATOR)
CONFIG_XOROSHIRO_RANDOM_GENERATOR OR
CONFIG_XOSHIRO_RANDOM_GENERATOR)
zephyr_library()
zephyr_library_sources_ifdef(CONFIG_USERSPACE rand32_handlers.c)
endif()
@ -16,7 +17,8 @@ endif()
zephyr_library_sources_ifdef(CONFIG_TIMER_RANDOM_GENERATOR rand32_timer.c)
zephyr_library_sources_ifdef(CONFIG_XOROSHIRO_RANDOM_GENERATOR rand32_xoroshiro128.c)
zephyr_library_sources_ifdef(CONFIG_CTR_DRBG_CSPRNG_GENERATOR rand32_ctr_drbg.c)
zephyr_library_sources_ifdef(CONFIG_XOSHIRO_RANDOM_GENERATOR rand32_xoshiro128.c)
zephyr_library_sources_ifdef(CONFIG_CTR_DRBG_CSPRNG_GENERATOR rand32_ctr_drbg.c)
if (CONFIG_ENTROPY_DEVICE_RANDOM_GENERATOR OR CONFIG_HARDWARE_DEVICE_CS_GENERATOR)
zephyr_library_sources(rand32_entropy_device.c)