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The random number generator from ESP32 uses noise from Wi-Fi and Bluetooth radios. If these are off, a pseudo-random number is generated instead; this is currently the case, but even though it's a black box, it's arguably better than returning a timestamp as a pseudo-random number generator. According to the ESP32 Technical Reference manual, the RNG passed the Dieharder Random Number Test suite (version 3.31.1)[1], but nothing has been said about the quality of the PRNG. The RNG register is read directly; no effort is made to use its contents to feed an entropy pool in a way that's similar to /dev/random on POSIX systems, as no such subsystem exists on Zephyr at the moment. [1] http://webhome.phy.duke.edu/~rgb/General/dieharder.php Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>
83 lines
2.2 KiB
Plaintext
83 lines
2.2 KiB
Plaintext
# Kconfig - random generator driver configuration options
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#
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# Copyright (c) 2014-2015 Wind River Systems, Inc.
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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menuconfig RANDOM_GENERATOR
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bool
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prompt "Random Drivers"
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default n
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help
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Include RANDOM drivers in system config.
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if RANDOM_GENERATOR
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source "drivers/random/Kconfig.mcux"
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source "drivers/random/Kconfig.stm32"
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source "drivers/random/Kconfig.esp32"
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config RANDOM_HAS_DRIVER
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bool
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default n
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help
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This is an option to be enabled by individual random driver
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to signal that there is a true random driver.
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config RANDOM_NAME
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string "Random Device Name"
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depends on RANDOM_GENERATOR
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default "RANDOM_0"
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help
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Specify the device name to be used for the RANDOM driver.
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config SYS_LOG_RANDOM_LEVEL
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int "Random Log level"
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depends on SYS_LOG && RANDOM_GENERATOR
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default 0
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range 0 4
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help
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Sets log level for random driver.
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Levels are:
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- 0 OFF: do not write
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- 1 ERROR: only write SYS_LOG_ERR
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- 2 WARNING: write SYS_LOG_WRN in addition to previous level
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- 3 INFO: write SYS_LOG_INF in addition to previous levels
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- 4 DEBUG: write SYS_LOG_DBG in addition to previous levels
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config TEST_RANDOM_GENERATOR
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bool
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prompt "Non-random number generator"
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depends on RANDOM_GENERATOR && ! RANDOM_HAS_DRIVER
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default n
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help
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This option signifies that the kernel's random number APIs are
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permitted to return values that are not truly random.
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This capability is provided for testing purposes, when a truly random
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number generator is not available. The non-random number generator
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should not be used in a production environment.
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config X86_TSC_RANDOM_GENERATOR
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bool
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prompt "x86 timestamp counter based number generator"
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depends on TEST_RANDOM_GENERATOR && X86
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default y
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help
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This options enables number generator based on timestamp counter
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of x86 boards, obtained with rdtsc instruction.
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config TIMER_RANDOM_GENERATOR
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bool
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prompt "System timer clock based number generator"
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depends on TEST_RANDOM_GENERATOR && !X86_TSC_RANDOM_GENERATOR
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default y
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help
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This options enables number generator based on system timer
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clock. This number generator is not random and used for
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testing only.
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endif
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