Rng Entropy Source Validation; Introduction; Validation Conditions; Data Collection - ST STM32F412 Reference Manual

True random number generator (RNG)
15.6

RNG entropy source validation

15.6.1

Introduction

In order to assess the amount of entropy available from the RNG, STMicroelectronics has
tested the peripheral using NIST SP800-22 rev1a statistical tests. The results can be
provided on demand or the customer can reproduce the tests.
For more information on running this NIST statistical test suite, refer to STM32
microcontrollers random number generation validation using NIST statistical test suite
application note (AN4230), available on STMicroelectronics website.
15.6.2

Validation conditions

STMicroelectronics has tested the RNG true random number generator in the following
conditions:
•
RNG clock rng_clk= 48 MHz (CED bit = '0' in RNG_CR register) and rng_clk = 400 kHz
(CED bit = '1' in RNG_CR register).
15.6.3

Data collection

In order to run statistical tests it is required to collect samples from the entropy source at raw
data level as well as at the output of the entropy source.Contact STMicroelectronics if above
samples need to be retrieved for your product.
408/1163 RM0402 Rev 6
RM0402