linux-kernel - Re: [PATCH v2 18/18] keyctl_pkey: Add pkey parameters slen and mgfhash for PSS

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Date:   Fri, 9 Apr 2021 10:15:48 -0400
From:   Ben Boeckel <me@...boeckel.net>
To:     Varad Gautam <varad.gautam@...e.com>
Cc:     linux-crypto@...r.kernel.org, dhowells@...hat.com,
        herbert@...dor.apana.org.au, davem@...emloft.net, vt@...linux.org,
        tianjia.zhang@...ux.alibaba.com, keyrings@...r.kernel.org,
        linux-kernel@...r.kernel.org, jarkko@...nel.org,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        "open list:SECURITY SUBSYSTEM" 
        <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH v2 18/18] keyctl_pkey: Add pkey parameters slen and
 mgfhash for PSS

On Thu, Apr 08, 2021 at 16:15:16 +0200, Varad Gautam wrote:
> keyctl pkey_* operations accept enc and hash parameters at present.
> RSASSA-PSS signatures also require passing in the signature salt
> length and the mgf hash function.
> 
> Add parameters:
> - 'slen' to feed in salt length of a PSS signature.
> - 'mgfhash' to feed in the hash function used for MGF.

Could `Documentation/security/keys/core.rst` be updated to mention these
new parameters? Statements on what values are allowed would be
appreciated as well (e.g., that `saltlen` (a far better name IMO) is
unsigned 32-bits and where valid algorithm names could be found as
well).

Thanks,

--Ben