RT117x: use True random entropy source

[mastupristi]

hi,

I need a seed for my pseudo-random number generator on RT1175.

1. Can I use True random entropy source for this?
2. How can I use this?
3. in alternative can I use RNG?
4. how?

regards

Max

[Kan_Li]

Hi @mastupristi ,

Are you referring to CAAM's RNG4 module in RT117x or some SW implemented random number generator ? Please kindly clarify.

Have a great day,
Kan

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[mastupristi]

Hi @Kan_Li 

Are you referring to CAAM's RNG4 module in RT117x

Yes, I'm referring to CAAM RNG

regards

Max

[Kan_Li]

Hi @mastupristi ,

Thanks for the clarification! The TRNG is integrated inside the CAAM module, no option to use an external True random entropy source instead.

Have a great day,
Kan

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[mastupristi]

Hi @Kan_Li 

The TRNG is integrated inside the CAAM module

this is really bad news. on the RT105x I could have extracted a random number from TRNG to use as a seed for my PRNG software algorithm.

What do you suggest I do to create a random seed for my PRNG algorithm? In other words, what else can I use as an entropy source?

no option to use an external True random entropy source instead.

what do you mean by ”external True random entropy source"?

best regards

Max

[Kan_Li]

Hi @mastupristi ,

Sorry for my misunderstanding! I was thinking you wanted CAAM module to use another True random entropy source instead the integrated TRNG , but for your case,  if your PRNG algorithm uses DRBG algorism other than SHA256-DRBG , you may use the seed generated from CAAM's TRNG, otherwise, just directly use the output from CAMM's RNG4 with SHA256-DRBG support .

Have a great day,
Kan

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