KW41Z Random Number Generation

[nickmckendree]

I am using the KW41Z with the 802.15.4 library and NXP framework. I am finding multiple random number generation functions in the provided code but I have not seen documentation or comments that describe the differences.

In SecLib, there is SecLib_get_random() which returns a 32 bit number. 

uint32_t SecLib_get_random(void)

In RNG framework there are three functions:

RNG_HwGetRandomNo: uses TRNG_GetRandomData, which is hardware

RNG_GetRandomNo: uses SecLib_get_random

RNG_GetPseudoRandomNo: pseudo random number generation

What is the difference between SecLib_get_random and RNG_HwGetRandomNo? Does SecLib_get_random use hardware or is it is secure pseudo number generator?

[estephania_mart]

Hello, 

TRNG

True Random Number Generator. See Chapter 43 from RM and TRNG_GetRandomData() from fsl_trng.c

RNG

 Software-based secure pseudo number generator that uses the seed from the TRNG (See RNG_Init ). 

Regards, 

Estephania