Re: [babel] Blake2S, blake2B or neither? [was: rather than ripemd160...]

Juliusz Chroboczek <jch@irif.fr> Sat, 01 December 2018 11:16 UTC

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Date: Sat, 01 Dec 2018 12:15:51 +0100
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From: Juliusz Chroboczek <jch@irif.fr>
To: Toke =?ISO-8859-1?Q?H=F8iland-J=F8rgensen?= <toke@toke.dk>
Cc: Markus Stenberg <markus.stenberg@iki.fi>, Dave =?ISO-8859-1?Q?T=E4ht?= <dave@taht.net>, babel-users <babel-users@lists.alioth.debian.org>, babel@ietf.org
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Subject: Re: [babel] Blake2S, blake2B or neither? [was: rather than ripemd160...]
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>> (1) leave the document as it is;
>> (2) add a mention that implementation of Blake2S is RECOMMENDED (SHOULD);
>> (3) add a mention that implementation of Blake2B is RECOMMENDED;
>> (4) add a mention that implementation of both 2B and 2S is RECOMMENDED.

> I'm in favour of (2).

Where is Blake2S-based HMAC defined?  RFC 7693 merely says:

   BLAKE2 does not require
   a special "HMAC" (Hashed Message Authentication Code) construction
   for keyed message authentication as it has a built-in keying
   mechanism.

but it does not appear to clearly define the HMAC construction.