Re: [PATCH v4 08/33] crypto: rockchip: better handle cipher key

[John Keeping]

On Fri, Apr 01, 2022 at 08:17:39PM +0000, Corentin Labbe wrote:
> The key should not be set in hardware too much in advance, this will
> fail it 2 TFM with different keys generate alternative requests.
> The key should be stored and used just before doing cipher operations.
> 
> Fixes: ce0183cb6464b ("crypto: rockchip - switch to skcipher API")
> Signed-off-by: Corentin Labbe <clabbe@xxxxxxxxxxxx>
> ---
>  drivers/crypto/rockchip/rk3288_crypto.h          |  1 +
>  drivers/crypto/rockchip/rk3288_crypto_skcipher.c | 10 +++++++---
>  2 files changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/crypto/rockchip/rk3288_crypto.h b/drivers/crypto/rockchip/rk3288_crypto.h
> index 8b1e15d8ddc6..826508e4a0c3 100644
> --- a/drivers/crypto/rockchip/rk3288_crypto.h
> +++ b/drivers/crypto/rockchip/rk3288_crypto.h
> @@ -245,6 +245,7 @@ struct rk_ahash_rctx {
>  struct rk_cipher_ctx {
>  	struct rk_crypto_info		*dev;
>  	unsigned int			keylen;
> +	u32 key[AES_MAX_KEY_SIZE / 4];

Should this be u8?  It's only ever memcpy'd so the fact the registers
are 32-bit is irrelevant.

(Also a very minor nit: this should probably be aligned in the same was
as the above two variables.)