fdeaa9103e
Deprecate the xoroshiro128+ PRNG algorithm in favour of xoshiro128++. xoshiro128++ is a drop-in replacement which is invisible from the user perspective. xoroshiro128+ is unsuitable because it is explicitly a floating-point PRNG, not a general-purpose PRNG. This means that the lower 4 bits of the output are actually linear, not random (from the designers, https://prng.di.unimi.it/). This means 1/8th of the generated data is not random. Additionally, xoroshiro128+ is not a 32bit algorithm, it operates on 64bit numbers. For the vast majority of Zephyr devices, this makes the PRNG slower than it needs to be. The replacement (xoshiro128++) is 32bit, with no loss in state space (still 128 bit). Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>
31 lines
1.3 KiB
CMake
31 lines
1.3 KiB
CMake
# SPDX-License-Identifier: Apache-2.0
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if (CONFIG_ENTROPY_DEVICE_RANDOM_GENERATOR OR
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CONFIG_TIMER_RANDOM_GENERATOR OR
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CONFIG_XOSHIRO_RANDOM_GENERATOR)
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zephyr_library()
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zephyr_library_sources_ifdef(CONFIG_USERSPACE rand32_handlers.c)
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endif()
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if (CONFIG_TEST_RANDOM_GENERATOR)
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message(WARNING "
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Warning: CONFIG_TEST_RANDOM_GENERATOR is not a truly random generator.
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This capability is not secure and it is provided for testing purposes only.
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Use it carefully.")
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endif()
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# XOROSHIRO builds the XOSHIRO implementation because a Kconfig choice cannot
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# select another choice as a means of deprecating the symbol. Swapping out the
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# implementation lets out-of-tree users still build until the symbol is removed.
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zephyr_library_sources_ifdef(CONFIG_TIMER_RANDOM_GENERATOR rand32_timer.c)
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zephyr_library_sources_ifdef(CONFIG_XOROSHIRO_RANDOM_GENERATOR rand32_xoshiro128.c)
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zephyr_library_sources_ifdef(CONFIG_XOSHIRO_RANDOM_GENERATOR rand32_xoshiro128.c)
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zephyr_library_sources_ifdef(CONFIG_CTR_DRBG_CSPRNG_GENERATOR rand32_ctr_drbg.c)
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if (CONFIG_ENTROPY_DEVICE_RANDOM_GENERATOR OR CONFIG_HARDWARE_DEVICE_CS_GENERATOR)
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zephyr_library_sources(rand32_entropy_device.c)
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endif()
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if (CONFIG_CTR_DRBG_CSPRNG_GENERATOR)
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zephyr_library_link_libraries_ifdef(CONFIG_MBEDTLS mbedTLS)
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endif()
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