topic Re: Internal Trusted Storage API on LPCpresso55s69. in LPC Microcontrollers

Internal Trusted Storage API on LPCpresso55s69.

ShinjiOhishi — Wed, 02 Jun 2021 10:35:19 GMT

Hello.
I want to know about "Internal Trusted Storage API" of PSA on LPCpresso55s69.
Does the data set by "psa_its_set" continue to be stored even if the power of the board is turned off?

Re: Internal Trusted Storage API on LPCpresso55s69.

gusarambula — Thu, 03 Jun 2021 22:30:31 GMT

Hello ShinjiOhishi,

The Platform Security Architecture is part of the ARM architecture, so we don’t have many documents pertaining it. The persistent keys are storage in isolated or shielded locations so these would not be lost on power off.

For the LPC55SXX in particular, you may see where the keys are stored in the protected flash region in the worksheet attached to its user manual (UM11126).

I hope that this information helps!

Regards,
Gustavo

Re: Internal Trusted Storage API on LPCpresso55s69.

ShinjiOhishi — Mon, 07 Jun 2021 09:00:52 GMT

Hi, Gusarambula.

Thank you for information about the persistent keys.

After running psa_generate_key () on PSA TEST: 216, dumped memory address 0x9E600.
Unfortunately, I have confirmed that the data is zero clear.
Is the ability to store keys in storage supported?

UM11126 P.142

before

after