MX8 CAAM TRNG feature difference against MX6

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MX8 CAAM TRNG feature difference against MX6

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cliffkong
NXP Employee
NXP Employee

Hi i.MX Security team,

Custom who is developing application based on MX8QXP and also they have former experence with MX6 asked below two questions realted to CAAM TRNG. They are running QNX OS, not Linux.

1. What is the difference of TRNG feature between MX8 and MX6?

2. Please explain considerations and difference in implementing TRNG driver in MX8 against MX6, for example, SCU and SECO involvement.

Thanks,

BR/Cliff

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b36401
NXP TechSupport
NXP TechSupport

There is nothing special to i.MX8.
The RNG generates cryptographically-strong, random data. CAAM 's RNG utilizes a true
random-number generator (TRNG) as well as a pseudo random-number generator
(PRNG) to achieve both true randomness and cryptographic strength.
The random numbers generated by the RNG are intended for direct use as secret keys,
per-message secrets, random challenges, and other similar quantities used in
cryptographic algorithms. Note that before data can be obtained from the RNG, it must be
instantiated in a particular mode by executing the appropriate descriptor. Also, a
descriptor must be executed to load the JDKEK, TDKEK and TDSK registers with data
from the RNG.

As for exact registers (SCU_HP0, SCU_HP1, etc) you can refer Security Reference Manual for these processors.

Have a great day,
Victor

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