netdev - Re: [PATCH net v3 3/3] esp, ah: modernize the crypto algorithm selections

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Message-ID: <c87f1edb-4130-a4a9-2915-ae5d55302f0a@strongswan.org>
Date:   Wed, 10 Jun 2020 11:03:55 +0200
From:   Tobias Brunner <tobias@...ongswan.org>
To:     Eric Biggers <ebiggers@...nel.org>, netdev@...r.kernel.org
Cc:     linux-crypto@...r.kernel.org, Corentin Labbe <clabbe@...libre.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Steffen Klassert <steffen.klassert@...unet.com>
Subject: Re: [PATCH net v3 3/3] esp, ah: modernize the crypto algorithm
 selections

Hi Eric,

> +	  Note that RFC 8221 considers AH itself to be "NOT RECOMMENDED".  It is
> +	  better to use ESP only, using an AEAD cipher such as AES-GCM.

What's NOT RECOMMENDED according to the RFC is the combination of ESP+AH
(i.e. use ESP only for confidentiality and AH for authentication), not
AH by itself (although the RFC keeps ENCR_NULL as a MUST because ESP
with NULL encryption is generally preferred over AH due to NATs).

Regards,
Tobias