i.MX Processors中的主题 Re: MX6ul optee CAAM driver for encryption not giving consistent results

MX6ul optee CAAM driver for encryption not giving consistent results

asmaa — Thu, 13 Feb 2020 04:52:06 GMT

Hello Everyone,

I am using imx6ul optee caam driver for crypto stuff in my project.
For testing , I am sending 8 bytes of data and 8 bytes of key as input, encryption algo as DES_ECB_NOPAD.

Function sequence I am calling is :

crypto_cipher_alloc_ctx -------> do_allocate(caam_cipher.c)
crypto_cipher_init --------> do_init (caam_cipher.c)
crypto_cipher_update -----> do_update (caam_cipher.c)
crypto_cipher_free_ctx ----->do_free (caam_cipher.c)

The problem I am facing is, I dont get consistent result, i.e sometimes I get encrypted ouput (1 out of 4 run) and sometimes instead of 0's (3 out of 4).

Is there anything I have to take care for Initialisation? Or I have to wait for any signal for encryption to complete.

I appreciate any help, any kind of pointers to search for.

Regards,
Asma

Re: MX6ul optee CAAM driver for encryption not giving consistent results

igorpadykov — Tue, 18 Feb 2020 00:57:48 GMT

Hi Asma

one can try to rebuild all image from scratch, use nxp software described on

i.MX Software and Development Tools | NXP

Best regards
igor
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Re: MX6ul optee CAAM driver for encryption not giving consistent results

asmaa — Thu, 27 Feb 2020 03:44:43 GMT

Hi igorpadykov‌,

I am pretty sure my setup is done very well including optee with imx6ul, because I have wriiten trusted application and other stuffs which are working.

What I am trying to achieve is enabled CAAM in optee. I have done most of the configuration like:

setting CFG_IMX_CAAM =y

CFG_IMXCRYPT ?= y

Other than this do I need to set anything else to make CAAM cipher work correctly in Optee?

Are there any steps you can provide me to enable CAAM in optee?

Regards,

Asma

Re: MX6ul optee CAAM driver for encryption not giving consistent results

igorpadykov — Thu, 27 Feb 2020 09:07:46 GMT

Hi Asma

additional document was sent via mail.

Best regards
igor