[PATCH v4 4/5] crypto: caam - add in-kernel interface for blob generator

[Jarkko Sakkinen]

On Mon, Oct 11, 2021 at 12:02:37PM +0200, Ahmad Fatoum wrote:
> The CAAM can be used to protect user-defined data across system reboot:
> 
>   - When the system is fused and boots into secure state, the master
>     key is a unique never-disclosed device-specific key
>   - random key is encrypted by key derived from master key
>   - data is encrypted using the random key
>   - encrypted data and its encrypted random key are stored alongside
>   - This blob can now be safely stored in non-volatile memory
> 
> On next power-on:
>   - blob is loaded into CAAM
>   - CAAM writes decrypted data either into memory or key register
> 
> Add functions to realize encrypting and decrypting into memory alongside
> the CAAM driver.
> 
> They will be used in a later commit as a source for the trusted key
> seal/unseal mechanism.
> 
> Reviewed-by: David Gstir <david at sigma-star.at>
> Tested-By: Tim Harvey <tharvey at gateworks.com>
> Signed-off-by: Steffen Trumtrar <s.trumtrar at pengutronix.de>
> Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>

What is CAAM? This is missing.

/Jarkko