[PATCH 12/21] nvme-auth: common: use crypto library in nvme_auth_derive_tls_psk()

[Hannes Reinecke]

On 3/2/26 08:59, Eric Biggers wrote:
> For the HKDF-Expand-Label computation in nvme_auth_derive_tls_psk(), use
> the crypto library instead of crypto_shash and crypto/hkdf.c.
> 
> While this means the HKDF "helper" functions are no longer utilized,
> they clearly weren't buying us much: it's simpler to just inline the
> HMAC computations directly, and this code needs to be tested anyway.  (A
> similar result was seen in fs/crypto/.  As a result, this eliminates the
> last user of crypto/hkdf.c, which we'll be able to remove as well.)
> 
> As usual this is also a lot more efficient, eliminating the allocation
> of a transformation object and multiple other dynamic allocations.
> 
> Signed-off-by: Eric Biggers <ebiggers at kernel.org>
> ---
>   drivers/nvme/common/auth.c | 156 +++++++++++++------------------------
>   1 file changed, 53 insertions(+), 103 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare at suse.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
hare at suse.de                                +49 911 74053 688
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