linux-kernel - Re: [PATCH v3] crypto: omap-aes: Add support for GCM mode

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Date:	Sun, 20 Sep 2015 12:38:44 +0200
From:	Matthijs van Duin <matthijsvanduin@...il.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-omap@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Tero Kristo <t-kristo@...com>, nsekhar@...com
Subject: Re: [PATCH v3] crypto: omap-aes: Add support for GCM mode

On 15 September 2015 at 15:28, Lokesh Vutla <lokeshvutla@...com> wrote:
> --- a/drivers/crypto/Kconfig
> +++ b/drivers/crypto/Kconfig
> @@ -293,6 +293,7 @@ config CRYPTO_DEV_OMAP_AES
>         depends on ARCH_OMAP2 || ARCH_OMAP3 || ARCH_OMAP2PLUS
>         select CRYPTO_AES
>         select CRYPTO_BLKCIPHER
> +       select CRYPTO_AEAD

Is it appropriate that this also selects CRYPTO_AEAD on omap2/omap3,
even though they do not support GCM?



> +#define AES_REG_CTRL_GCM               GENMASK(17, 16)

Instead of adding these definitions one bit at a time, can't we get
the whole list over with at once? This thing supports:

ECB, CBC, and CFB-128 encryption
CTR and F8 encryption with 16/32/64/96/128-bit counter
XEX (disk encryption)
CBC-MAC authentication including the CMAC/OMAC/PMAC subflavors
F9 authentication
GCM and CCM aead
(and raw GHASH, if you happen to have a use for it)
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