linux-kernel - Re: [PATCH] crypto: starfive - Align rsa input data to 32-bit

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Date: Fri, 7 Jun 2024 19:16:59 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: Jia Jie Ho <jiajie.ho@...rfivetech.com>
Cc: "David S . Miller" <davem@...emloft.net>, linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] crypto: starfive - Align rsa input data to 32-bit

On Wed, May 29, 2024 at 08:25:53AM +0800, Jia Jie Ho wrote:
> Hardware expects RSA input plain/ciphertext to be 32-bit aligned.
> Allocate aligned buffer and shift data accordingly.
> 
> Signed-off-by: Jia Jie Ho <jiajie.ho@...rfivetech.com>
> ---
>  drivers/crypto/starfive/jh7110-cryp.h |  3 +--
>  drivers/crypto/starfive/jh7110-rsa.c  | 17 ++++++++++-------
>  2 files changed, 11 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/crypto/starfive/jh7110-cryp.h b/drivers/crypto/starfive/jh7110-cryp.h
> index 494a74f52706..eeb4e2b9655f 100644
> --- a/drivers/crypto/starfive/jh7110-cryp.h
> +++ b/drivers/crypto/starfive/jh7110-cryp.h
> @@ -217,12 +217,11 @@ struct starfive_cryp_request_ctx {
>  	struct scatterlist			*out_sg;
>  	struct ahash_request			ahash_fbk_req;
>  	size_t					total;
> -	size_t					nents;
>  	unsigned int				blksize;
>  	unsigned int				digsize;
>  	unsigned long				in_sg_len;
>  	unsigned char				*adata;
> -	u8 rsa_data[] __aligned(sizeof(u32));
> +	u8					*rsa_data;

You didn't explain why this is moving from a pre-allocated buffer
to one that's allocated on the run.  It would appear that there is
no reason why you can't build the extra space used for shifting
into reqsize.

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