Re: [babel] Babel-MAC: Blake2s is 128-bits by default
Donald Eastlake <d3e3e3@gmail.com> Sat, 07 November 2020 01:53 UTC
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From: Donald Eastlake <d3e3e3@gmail.com>
Date: Fri, 06 Nov 2020 20:52:52 -0500
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To: David Schinazi <dschinazi.ietf@gmail.com>
Cc: Antonin Décimo <antonin.decimo@gmail.com>, Toke Høiland-Jørgensen <toke=40toke.dk@dmarc.ietf.org>, Juliusz Chroboczek <jch@irif.fr>, Babel at IETF <babel@ietf.org>, Valery Smyslov <valery@smyslov.net>, Barbara Stark <bs7652@att.com>
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Subject: Re: [babel] Babel-MAC: Blake2s is 128-bits by default
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I guess AUTH48 is probably the right time to do this. Speaking as a WG member, although my opinion is not very strong, I would suggest - SHOULD implement BLAKE2s with 32-octet hashes Thanks, Donald =============================== Donald E. Eastlake 3rd +1-508-333-2270 (cell) 2386 Panoramic Circle, Apopka, FL 32703 USA d3e3e3@gmail.com On Fri, Nov 6, 2020 at 7:14 PM David Schinazi <dschinazi.ietf@gmail.com> wrote: > Random thought: the draft mentions that the MAC algorithm > is configured alongside the key for it. Perhaps we should > add an explicit sentence such as "For MAC algorithms that > support multiple digest sizes (such as BLAKE2s), the digest > size needs to be communicated alongside the MAC algorithm.". > > I agree that the "SHOULD implement BLAKE2s" should > mention a key length, but I have no preference between: > - SHOULD implement BLAKE2s with 16-octet hashes > - SHOULD implement BLAKE2s with 32-octet hashes > - SHOULD implement BLAKE2s with both 16 and 32-octet hashes > > David > > On Fri, Nov 6, 2020 at 3:09 PM Antonin Décimo <antonin.decimo@gmail.com> > wrote: > >> > > As Valery Smyslov noted, BLAKE2s is able to produce hashes of any size >> > > between 1 and 32 octets (8 and 256 bits). However, both >> implementations >> > > of Babel-MAC only ever produce 16-octet BLAKE2s hashes. >> > >> > Okay, something seemed off about this when I read it just now, so I just >> > double checked: And in fact both implementations use 32-byte Blake2s >> > digest sizes... >> >> That also seemed off to me. To be fair regarding babeld, the "old" >> hmac branch used 16-bytes blake2s, and my rewrite uses 32-bytes. We’re >> using the reference blake2s implementation, and I changed 16 to the >> provided BLAKE2S_OUTBYTES = 32 constant. >> >> > I still support making the change and specifying the size, but to >> > correspond to current implementation practice the change would need to >> > be "with 256-bit (32 octet) hashes". >> >> Me too. I an exchange earlier this year, Donald and Juliusz explained >> to me that the size of the output hash is considered part of the >> hashing algorithm, so yes, I support making that explicit for blake2s. >> >> >> -- Antonin >> >> _______________________________________________ >> babel mailing list >> babel@ietf.org >> https://www.ietf.org/mailman/listinfo/babel >> >
- [babel] Babel-MAC: Blake2s is 128-bits by default Juliusz Chroboczek
- Re: [babel] Babel-MAC: Blake2s is 128-bits by def… David Schinazi
- Re: [babel] Babel-MAC: Blake2s is 128-bits by def… Toke Høiland-Jørgensen
- Re: [babel] Babel-MAC: Blake2s is 128-bits by def… Juliusz Chroboczek
- Re: [babel] Babel-MAC: Blake2s is 128-bits by def… Antonin Décimo
- Re: [babel] Babel-MAC: Blake2s is 128-bits by def… David Schinazi
- Re: [babel] Babel-MAC: Blake2s is 128-bits by def… Donald Eastlake
- Re: [babel] Babel-MAC: Blake2s is 128-bits by def… Juliusz Chroboczek
- Re: [babel] Babel-MAC: Blake2s is 128-bits by def… Donald Eastlake
- Re: [babel] Babel-MAC: Blake2s is 128-bits by def… Gabriel Kerneis
- Re: [babel] Babel-MAC: Blake2s is 128-bits by def… Juliusz Chroboczek
- Re: [babel] Babel-MAC: Blake2s is 128-bits by def… Toke Høiland-Jørgensen
- Re: [babel] Babel-MAC: Blake2s is 128-bits by def… Juliusz Chroboczek
- Re: [babel] Babel-MAC: Blake2s is 128-bits by def… Toke Høiland-Jørgensen
- Re: [babel] Babel-MAC: Blake2s is 128-bits by def… Valery Smyslov
- Re: [babel] Babel-MAC: Blake2s is 128-bits by def… Toke Høiland-Jørgensen
- Re: [babel] Babel-MAC: Blake2s is 128-bits by def… Juliusz Chroboczek
- Re: [babel] Babel-MAC: Blake2s is 128-bits by def… Toke Høiland-Jørgensen
- Re: [babel] Babel-MAC: Blake2s is 128-bits by def… Juliusz Chroboczek
- Re: [babel] Babel-MAC: Blake2s is 128-bits by def… Antonin Décimo
- Re: [babel] Babel-MAC: Blake2s is 128-bits by def… Toke Høiland-Jørgensen
- Re: [babel] Babel-MAC: Blake2s is 128-bits by def… Donald Eastlake
- Re: [babel] Babel-MAC: Blake2s is 128-bits by def… Donald Eastlake
- Re: [babel] Babel-MAC: Blake2s is 128-bits by def… STARK, BARBARA H
- Re: [babel] Babel-MAC: Blake2s is 128-bits by def… Toke Høiland-Jørgensen
- Re: [babel] Babel-MAC: Blake2s is 128-bits by def… Juliusz Chroboczek