RE: [PATCH 2/2] crypto: caam - support tagged keys for skcipher algorithms

[Van Leeuwen, Pascal]

> -----Original Message-----
> From: linux-crypto-owner@xxxxxxxxxxxxxxx <linux-crypto-owner@xxxxxxxxxxxxxxx> On Behalf Of Herbert Xu
> Sent: Thursday, July 16, 2020 2:20 PM
> To: Horia GeantÄ <horia.geanta@xxxxxxx>
> Cc: Iuliana Prodan <iuliana.prodan@xxxxxxx>; Aymen Sghaier <aymen.sghaier@xxxxxxx>; David S. Miller <davem@xxxxxxxxxxxxx>;
> Silvano Di Ninno <silvano.dininno@xxxxxxx>; Franck Lenormand <franck.lenormand@xxxxxxx>; linux-crypto@xxxxxxxxxxxxxxx;
> linux-kernel@xxxxxxxxxxxxxxx; dl-linux-imx <linux-imx@xxxxxxx>
> Subject: Re: [PATCH 2/2] crypto: caam - support tagged keys for skcipher algorithms
>
> <<< External Email >>>
> On Thu, Jul 16, 2020 at 03:07:50PM +0300, Horia GeantÄ wrote:
> >
> > So instead of tk(cbc(aes)) use paes(cbc(aes) or cbc(paes)?
>
> Well if we're following the existing paes model then it'd be
> cbc(paes).
>
> > How would this work for hmac(sha512),
> > paes(hmac(sha512)) or hmac(psha512), or even phmac(sha512)?
>
> Perhaps hmac(psha512).
>
That would make no sense though, as sha512 does not involve any keys ...
It's the HMAC part that needs the keys. So phmac(sha512) then?

> The point is whatever scheme you come up with has to be consistent
> across all drivers.
>
> Cheers,
> --
> Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
> Home Page: http://gondor.apana.org.au/~herbert/
> PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

Pascal van Leeuwen
Silicon IP Architect Multi-Protocol Engines, Rambus Security
Rambus ROTW Holding BV
+31-73 6581953

Note: The Inside Secure/Verimatrix Silicon IP team was recently acquired by Rambus.
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