linux-kernel - Re: [PATCH v1 08/15] crypto: talitos - Do not modify req->cryptlen on decryption.

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Message-ID: <VI1PR0402MB348519D7E3927482A894F276981E0@VI1PR0402MB3485.eurprd04.prod.outlook.com>
Date:   Tue, 28 May 2019 08:20:29 +0000
From:   Horia Geanta <horia.geanta@....com>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>
CC:     "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH v1 08/15] crypto: talitos - Do not modify req->cryptlen on
 decryption.

On 5/21/2019 4:34 PM, Christophe Leroy wrote:
> For decrypt, req->cryptlen includes the size of the authentication
> part while all functions of the driver expect cryptlen to be
> the size of the encrypted data.
> 
> As it is not expected to change req->cryptlen, this patch
> implements local calculation of cryptlen.
> 
An alternative would be to restore req->cryptlen in the *_done() callback.
It would be easier to implement, though probably less intuitive.

Horia