linux-kernel - Re: [PATCH v4] KEYS: encrypted: Instantiate key with user-provided decrypted data

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Message-ID: <YdoJD3Kaas07v6K4@iki.fi>
Date:   Sat, 8 Jan 2022 23:58:39 +0200
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Yael Tiomkin <yaelt@...gle.com>
Cc:     linux-integrity@...r.kernel.org, jejb@...ux.ibm.com,
        zohar@...ux.ibm.com, corbet@....net, dhowells@...hat.com,
        jmorris@...ei.org, serge@...lyn.com, keyrings@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org
Subject: Re: [PATCH v4] KEYS: encrypted: Instantiate key with user-provided
 decrypted data

On Wed, Dec 29, 2021 at 04:53:30PM -0500, Yael Tiomkin wrote:
> The encrypted.c class supports instantiation of encrypted keys with
> either an already-encrypted key material, or by generating new key
> material based on random numbers. This patch defines a new datablob
> format: [<format>] <master-key name> <decrypted data length>
> <decrypted data> that allows to instantiate encrypted keys using
> user-provided decrypted data, and therefore allows to perform key
> encryption from userspace. The decrypted key material will be
> inaccessible from userspace.
> 
> Reviewed-by: Mimi Zohar <zohar@...ux.ibm.com>
> Signed-off-by: Yael Tiomkin <yaelt@...gle.com>

What is the use case for this?

BR, Jarkko