linux-kernel - Re: [PATCH] crypto: mediatek - Add empty messages check in GCM mode

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Date:   Tue, 22 Aug 2017 15:01:44 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Ryder Lee <ryder.lee@...iatek.com>
Cc:     linux-crypto@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] crypto: mediatek - Add empty messages check in GCM mode

On Wed, Aug 16, 2017 at 07:19:48PM +0800, Ryder Lee wrote:
> Currently, empty messages are not supported in GCM mode, hence add
> a check to prevent producing incorrect results.
> 
> Signed-off-by: Ryder Lee <ryder.lee@...iatek.com>
> ---
>  drivers/crypto/mediatek/mtk-aes.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/crypto/mediatek/mtk-aes.c b/drivers/crypto/mediatek/mtk-aes.c
> index 9e845e8..efe4e63 100644
> --- a/drivers/crypto/mediatek/mtk-aes.c
> +++ b/drivers/crypto/mediatek/mtk-aes.c
> @@ -928,8 +928,13 @@ static int mtk_aes_gcm_start(struct mtk_cryp *cryp, struct mtk_aes_rec *aes)
>  static int mtk_aes_gcm_crypt(struct aead_request *req, u64 mode)
>  {
>  	struct mtk_aes_base_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
> +	struct mtk_aes_gcm_ctx *gctx = mtk_aes_gcm_ctx_cast(ctx);
>  	struct mtk_aes_reqctx *rctx = aead_request_ctx(req);
>  
> +	/* Empty messages are not supported yet */
> +	if (!gctx->textlen && !req->assoclen)
> +		return -EINVAL

Your patch does not compile.
-- 
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