linux-kernel - Re: Idea behind EXT4_IOC_GET_ENCRYPTION

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Date:   Wed, 30 Nov 2016 09:29:40 +0100
From:   Richard Weinberger <richard@....at>
To:     Joe Richey <joerichey@...gle.com>
Cc:     linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Ext4 Developers List <linux-ext4@...r.kernel.org>,
        Michael Halcrow <mhalcrow@...gle.com>,
        Theodore Ts'o <tytso@....edu>, muslukhovi@...il.com,
        David Gstir <david@...ma-star.at>
Subject: Re: Idea behind EXT4_IOC_GET_ENCRYPTION_PWSALT?

Joe,

On 30.11.2016 01:44, Joe Richey wrote:
> Richard,
> 
> Our current design for fscrypt (tentative name for the userspace
> filesystem encryption manager) does not use the global filesystem salt
> (EXT4_IOC_GET_ENCRYPTION_PWSALT), we are planning on having a
> different salt for each password used in the system. We are using
> planning on using Argon2id as the password stretching algorithm, so
> we'll have costs for memory, time, and parallelism stored for each
> password as well as a salt.


Makes sense.
So, for now I'll not implement this ioctl command in UBIFS.

Thanks,
//richard