Documentation/admin-guide/hw_random.rst

Source file repositories/reference/linux-study-clean/Documentation/admin-guide/hw_random.rst

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Documentation/admin-guide/hw_random.rst
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Support Tooling And Documentation
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Support Tooling And Documentation: documentation
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Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

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=================================
Hardware random number generators
=================================

Introduction
============

The hw_random framework is software that makes use of a
special hardware feature on your CPU or motherboard,
a Random Number Generator (RNG).  The software has two parts:
a core providing the /dev/hwrng character device and its
sysfs support, plus a hardware-specific driver that plugs
into that core.

To make the most effective use of these mechanisms, you
should download the support software as well.  Download the
latest version of the "rng-tools" package from:

	https://github.com/nhorman/rng-tools

Those tools use /dev/hwrng to fill the kernel entropy pool,
which is used internally and exported by the /dev/urandom and
/dev/random special files.

Theory of operation
===================

CHARACTER DEVICE.  Using the standard open()
and read() system calls, you can read random data from
the hardware RNG device.  This data is NOT CHECKED by any
fitness tests, and could potentially be bogus (if the
hardware is faulty or has been tampered with).  Data is only
output if the hardware "has-data" flag is set, but nevertheless
a security-conscious person would run fitness tests on the
data before assuming it is truly random.

The rng-tools package uses such tests in "rngd", and lets you
run them by hand with a "rngtest" utility.

/dev/hwrng is char device major 10, minor 183.

CLASS DEVICE.  There is a /sys/class/misc/hw_random node with
two unique attributes, "rng_available" and "rng_current".  The
"rng_available" attribute lists the hardware-specific drivers
available, while "rng_current" lists the one which is currently
connected to /dev/hwrng.  If your system has more than one
RNG available, you may change the one used by writing a name from
the list in "rng_available" into "rng_current".

==========================================================================


Hardware driver for Intel/AMD/VIA Random Number Generators (RNG)
	- Copyright 2000,2001 Jeff Garzik <jgarzik@pobox.com>
	- Copyright 2000,2001 Philipp Rumpf <prumpf@mandrakesoft.com>


About the Intel RNG hardware, from the firmware hub datasheet
=============================================================

The Firmware Hub integrates a Random Number Generator (RNG)
using thermal noise generated from inherently random quantum
mechanical properties of silicon. When not generating new random
bits the RNG circuitry will enter a low power state. Intel will
provide a binary software driver to give third party software
access to our RNG for use as a security feature. At this time,
the RNG is only to be used with a system in an OS-present state.

Intel RNG Driver notes
======================

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Implementation Notes