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Date:   Thu, 30 Apr 2020 23:03:36 -0700
From:   Eric Biggers <ebiggers@kernel.org>
To:     Johannes Thumshirn <jth@kernel.org>
Cc:     David Sterba <dsterba@suse.cz>, linux-fsdevel@vger.kernel.org,
        linux-btrfs@vger.kernel.org, Richard Weinberger <richard@nod.at>,
        Johannes Thumshirn <johannes.thumshirn@wdc.com>
Subject: Re: [PATCH v2 0/2] Add file-system authentication to BTRFS
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On Tue, Apr 28, 2020 at 12:58:57PM +0200, Johannes Thumshirn wrote:
> 
> There was interest in also using a HMAC version of Blake2b from the community,
> but as none of the crypto libraries used by user-space BTRFS tools as a
> backend does currently implement a HMAC version with Blake2b, it is not (yet)
> included.

Note that BLAKE2b optionally takes a key, so using HMAC with it is unnecessary.

And the kernel crypto API's implementation of BLAKE2b already supports this.
I.e. you can call crypto_shash_setkey() directly on "blake2b-256".

- Eric