linux-kernel - Re: [PATCH 15/18] crypto: dh - store group id in dh-generic's dh

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Message-ID: <7bcdee15-1902-74d3-b5b7-1a341b0a8e60@suse.de>
Date:   Wed, 1 Dec 2021 08:32:40 +0100
From:   Hannes Reinecke <hare@...e.de>
To:     Nicolai Stange <nstange@...e.de>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Stephan Müller <smueller@...onox.de>,
        Torsten Duwe <duwe@...e.de>, Zaibo Xu <xuzaibo@...wei.com>,
        Giovanni Cabiddu <giovanni.cabiddu@...el.com>,
        David Howells <dhowells@...hat.com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        qat-linux@...el.com, keyrings@...r.kernel.org
Subject: Re: [PATCH 15/18] crypto: dh - store group id in dh-generic's dh_ctx

On 12/1/21 1:48 AM, Nicolai Stange wrote:
> A subsequent patch will make the crypto/dh's dh_is_pubkey_valid() to
> calculate the Q value from the P domain parameter for safe-prime groups,
> for which by definition Q = (P - 1)/2. However, dh_is_pubkey_valid() will
> need to check first whether the group in question is actually a safe-prime
> group. In order to make this information available, introduce a new
> ->group_id member to struct dh_ctx and let dh_set_params() set it to the
> value found in the struct dh as deserialized via crypto_dh_decode_key().
> 
> Signed-off-by: Nicolai Stange <nstange@...e.de>
> ---
>   crypto/dh.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                Kernel Storage Architect
hare@...e.de                              +49 911 74053 688
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