2018-08-27 21:14:01 +08:00
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#
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# For a description of the syntax of this configuration file,
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# see the file kconfig-language.txt in the NuttX tools repository.
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#
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config ARCH_HAVE_RNG
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bool
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config DEV_RANDOM
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bool "Enable /dev/random"
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default y
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depends on ARCH_HAVE_RNG
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---help---
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Enable support for /dev/random provided by a hardware TRNG.
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config DEV_URANDOM
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bool "Enable /dev/urandom"
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default n
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---help---
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Enable support for /dev/urandom provided by either a hardware TRNG or
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by a software PRNG implementation.
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NOTE: This option may not be cryptographially secure and should not
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be enabled if you are concerned about cyptographically secure
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pseudo-random numbers (CPRNG) and do not know the characteristics
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of the software PRNG implementation!
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if DEV_URANDOM
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choice
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prompt "/dev/urandom algorithm"
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default DEV_URANDOM_ARCH if ARCH_HAVE_RNG
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default DEV_URANDOM_XORSHIFT128 if !ARCH_HAVE_RNG
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config DEV_URANDOM_XORSHIFT128
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bool "xorshift128"
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---help---
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xorshift128 is a pseudorandom number generator that is simple,
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portable, and can also be used on 8-bit and 16-bit MCUs.
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NOTE: Not cyptographically secure
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config DEV_URANDOM_CONGRUENTIAL
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bool "Congruential"
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---help---
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Use the same congruential general used with srand(). This algorithm
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is computationally more intense and uses double precision floating
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point. NOTE: Good randomness from the congruential generator also
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2021-08-01 15:27:08 +08:00
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requires that you also select CONFIG_LIBC_RAND_ORDER > 2
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2018-08-27 21:14:01 +08:00
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NOTE: Not cyptographically secure
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config DEV_URANDOM_RANDOM_POOL
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bool "Entropy pool"
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depends on CRYPTO_RANDOM_POOL
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---help---
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Use the entropy pool CPRNG output for urandom algorithm.
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NOTE: May or may not be cyptographically secure, depending upon the
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quality entropy available to entropy pool.
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config DEV_URANDOM_ARCH
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bool "Architecture-specific"
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depends on ARCH_HAVE_RNG
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---help---
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The implementation of /dev/urandom is provided in archtecture-
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specific logic using hardware TRNG logic. architecture-specific
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logic must provide the whole implementation in this case, including
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the function devurandom_register(). In this case, /dev/urandom may
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refer to the same driver as /dev/random.
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NOTE: May or may not be cyptographically secure, depending upon the
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implementation.
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endchoice # /dev/urandom algorithm
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endif # DEV_URANDOM
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