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Date:   Fri, 28 Aug 2020 10:23:59 +0100
From:   Giovanni Cabiddu <giovanni.cabiddu@intel.com>
To:     Ard Biesheuvel <ardb@kernel.org>
Cc:     Herbert Xu <herbert@gondor.apana.org.au>,
        Linux Crypto Mailing List <linux-crypto@vger.kernel.org>,
        qat-linux <qat-linux@intel.com>,
        "Przychodni, Dominik" <dominik.przychodni@intel.com>
Subject: Re: [PATCH] crypto: qat - aead cipher length should be block multiple
Message-ID: <20200828092359.GA62902@silpixa00400314>
References: <20200822072934.4394-1-giovanni.cabiddu@intel.com>
 <1cffce42de2f4e7b84514a27bd9a889d@irsmsx602.ger.corp.intel.com>
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On Sat, Aug 22, 2020 at 02:04:10PM +0100, Ard Biesheuvel wrote:
> On Sat, 22 Aug 2020 at 09:29, Giovanni Cabiddu
> <giovanni.cabiddu@intel.com> wrote:
> >
> > From: Dominik Przychodni <dominik.przychodni@intel.com>
> >
> > Include an additional check on the cipher length to prevent undefined
> > behaviour from occurring upon submitting requests which are not a
> > multiple of AES_BLOCK_SIZE.
> >
> > Fixes: d370cec32194 ("crypto: qat - Intel(R) QAT crypto interface")
> > Signed-off-by: Dominik Przychodni <dominik.przychodni@intel.com>
> > Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
> 
> I only looked at the patch, and not at the entire file, but could you
> explain which AES based AEAD implementations require the input length
> to be a multiple of the block size? CCM and GCM are both CTR based,
> and so any input length should be supported for at least those modes.
This is only for AES CBC as the qat driver supports only
authenc(hmac(sha1),cbc(aes)), authenc(hmac(sha256),cbc(aes)) and
authenc(hmac(sha512),cbc(aes)).

Regards,

-- 
Giovanni