linux-kernel - Re: [PATCH 2/2] crypto: caam - support tagged keys for skcipher algorithms

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Date:   Thu, 16 Jul 2020 17:36:10 +1000
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Iuliana Prodan <iuliana.prodan@....com>
Cc:     Horia Geanta <horia.geanta@....com>,
        Aymen Sghaier <aymen.sghaier@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Silvano Di Ninno <silvano.dininno@....com>,
        Franck Lenormand <franck.lenormand@....com>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-imx <linux-imx@....com>
Subject: Re: [PATCH 2/2] crypto: caam - support tagged keys for skcipher
 algorithms

On Mon, Jul 13, 2020 at 01:05:36AM +0300, Iuliana Prodan wrote:
> Tagged keys are keys that contain metadata indicating what
> they are and how to handle them using tag_object API.
> 
> Add support, for tagged keys, to skcipher algorithms by
> adding new transformations, with _tk_ prefix to distinguish
> between plaintext and tagged keys.
> 
> For job descriptors a new option (key_cmd_opt) was added for KEY command.
> Tagged keys can be loaded using only a KEY command with ENC=1
> and the proper setting of the EKT bit. The EKT bit in the
> KEY command indicates which encryption algorithm (AES-ECB or
> AES-CCM) should be used to decrypt the key. These options will be kept in
> key_cmd_opt.
> 
> The tk_ transformations can be used directly by their name:
> struct sockaddr_alg sa = {
>     .salg_family = AF_ALG,
>     .salg_type = "skcipher", /* this selects the symmetric cipher */
>     .salg_name = "tk(cbc(aes))" /* this is the cipher name */
> };
> or for dm-crypt, e.g. using dmsetup:
> dmsetup -v create encrypted --table "0 $(blockdev --getsz /dev/mmcblk2p10)
> crypt capi:tk(cbc(aes))-plain :32:logon:seckey 0 /dev/mmcblk2p10 0 1
> sector_size:512".
> 
> Signed-off-by: Franck LENORMAND <franck.lenormand@....com>
> Signed-off-by: Iuliana Prodan <iuliana.prodan@....com>

Can this use the existing paes name instead of tk as done in
other drivers?

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt