linux-kernel - Re: [PATCH RESEND 1/9] crypto: caam/jr - add fallback for XTS with more than 8B IV

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Date:   Fri, 21 Aug 2020 13:46:51 +1000
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Andrei Botila <andrei.botila@....nxp.com>
Cc:     Horia Geanta <horia.geanta@....com>,
        Aymen Sghaier <aymen.sghaier@....com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND 1/9] crypto: caam/jr - add fallback for XTS with
 more than 8B IV

On Thu, Aug 06, 2020 at 07:35:43PM +0300, Andrei Botila wrote:
>
> +static bool xts_skcipher_ivsize(struct skcipher_request *req)
> +{
> +	struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
> +	unsigned int ivsize = crypto_skcipher_ivsize(skcipher);
> +	u64 size = 0;
> +
> +	if (IS_ALIGNED((unsigned long)req->iv, __alignof__(u64)))
> +		size = *(u64 *)(req->iv + (ivsize / 2));
> +	else
> +		size = get_unaligned((u64 *)(req->iv + (ivsize / 2)));
> +
> +	return !!size;
> +}

Just go with the get_unaligned unconditionally.

Cheers,
-- 
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