topic Re: Use of CAAM module for bare metal application in i.MX Processors

Use of CAAM module for bare metal application

srouser526 — Tue, 12 Jul 2016 15:32:51 GMT

Hello,

I have a question. Is it possible to use the CAAM hardware cryptographic functions in a bare-metal application. Are there any drivers provided? I only know, that there exist drivers for linux.

Especially I like to know of it is possible, to calculate the SHA256 value for any input data in a bare-metal application.

HAB is not providing the simple calculation of a HASH value, isn't it? There are only some abstract functions to authentificate complete image.

If there exist a possibility or a driver for the hash calculation is there as well a possibility to stream the input data for the hash calculation? In the best case I like to call a function several times to stream some input data to the CAAM hash module.

Thanks.

Re: Use of CAAM module for bare metal application

igorpadykov — Wed, 13 Jul 2016 00:22:24 GMT

Hi stefanrombach

sdk had some simple tests: caam_blob_gen.c,caam_test.c,

however it was removed from web. For obtaining it please create

service request.

Best regards

igor

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Re: Use of CAAM module for bare metal application

srouser526 — Wed, 13 Jul 2016 06:49:04 GMT

Hi igorpadykov,

thanks for your reply. Yes, I could find the simple test which you mention. Like you said, the example is just to create some key blobs and to encrypt/decrypt data. Unfortunately, the example is not using a hash algorithm like the SHA. There exists no example for using it in a bare-metal application?

At least it would help me to get a sequence for the job descriptor to calculate a hash value with the SHA256. Is it possible to stream the input data for the hash calculation for example via a FIFO which is not filled at all at the start of the calculation.

Best regards

stefan