linux-kernel - Re: [PATCH 06/10] crypto: omap-aes: gcm: Handle inputs properly

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Date:	Thu, 2 Jul 2015 03:04:55 -0500
From:	Felipe Balbi <balbi@...com>
To:	Lokesh Vutla <lokeshvutla@...com>
CC:	<herbert@...dor.apana.org.au>, <linux-crypto@...r.kernel.org>,
	<davem@...emloft.net>, <linux-omap@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <t-kristo@...com>, <nsekhar@...com>
Subject: Re: [PATCH 06/10] crypto: omap-aes: gcm: Handle inputs properly

On Thu, Jul 02, 2015 at 10:48:36AM +0530, Lokesh Vutla wrote:
> Its not necessary that assoc data and plain text is passed always.
> Add these checks before processing the input.
> 
> Signed-off-by: Lokesh Vutla <lokeshvutla@...com>

why can't this be combined with patch which added GCM in the first
place ?

> ---
>  drivers/crypto/omap-aes-gcm.c |   26 ++++++++++++++++++++------
>  1 file changed, 20 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/crypto/omap-aes-gcm.c b/drivers/crypto/omap-aes-gcm.c
> index 1be9d91..72815af 100644
> --- a/drivers/crypto/omap-aes-gcm.c
> +++ b/drivers/crypto/omap-aes-gcm.c
> @@ -87,7 +87,7 @@ static int omap_aes_gcm_copy_buffers(struct omap_aes_dev *dd,
>  				     struct aead_request *req)
>  {
>  	void *buf_in;
> -	int alen, clen;
> +	int alen, clen, nsg;
>  	struct crypto_aead *aead = crypto_aead_reqtfm(req);
>  	unsigned int authlen = crypto_aead_authsize(aead);
>  	u32 dec = !(dd->flags & FLAGS_ENCRYPT);
> @@ -97,12 +97,18 @@ static int omap_aes_gcm_copy_buffers(struct omap_aes_dev *dd,
>  
>  	dd->sgs_copied = 0;
>  
> -	sg_init_table(dd->in_sgl, 2);
> -	buf_in = sg_virt(req->assoc);
> -	sg_set_buf(dd->in_sgl, buf_in, alen);
> +	nsg = 1 + !!(req->assoclen && req->cryptlen);
>  
> -	buf_in = sg_virt(req->src);
> -	sg_set_buf(&dd->in_sgl[1], buf_in, clen);
> +	sg_init_table(dd->in_sgl, nsg);
> +	if (req->assoclen) {
> +		buf_in = sg_virt(req->assoc);
> +		sg_set_buf(dd->in_sgl, buf_in, alen);
> +	}
> +
> +	if (req->cryptlen) {
> +		buf_in = sg_virt(req->src);
> +		sg_set_buf(&dd->in_sgl[nsg - 1], buf_in, clen);
> +	}
>  
>  	dd->in_sg = dd->in_sgl;
>  	dd->total = clen;
> @@ -258,6 +264,8 @@ static int omap_aes_gcm_crypt(struct aead_request *req, unsigned long mode)
>  {
>  	struct omap_aes_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
>  	struct omap_aes_reqctx *rctx = aead_request_ctx(req);
> +	struct crypto_aead *aead = crypto_aead_reqtfm(req);
> +	unsigned int authlen = crypto_aead_authsize(aead);
>  	struct omap_aes_dev *dd;
>  	__be32 counter = cpu_to_be32(1);
>  	int err;
> @@ -270,6 +278,12 @@ static int omap_aes_gcm_crypt(struct aead_request *req, unsigned long mode)
>  	if (err)
>  		return err;
>  
> +	if (req->assoclen + req->cryptlen == 0) {
> +		scatterwalk_map_and_copy(ctx->auth_tag, req->dst, 0, authlen,
> +					 1);
> +		return 0;
> +	}
> +
>  	dd = omap_aes_find_dev(ctx);
>  	if (!dd)
>  		return -ENODEV;
> -- 
> 1.7.9.5
> 
> --
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-- 
balbi

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