Re: [Cfrg] SIV for non-AES ciphers first draft
Neil Madden <neil.e.madden@gmail.com> Tue, 18 December 2018 10:18 UTC
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From: Neil Madden <neil.e.madden@gmail.com>
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Date: Tue, 18 Dec 2018 10:18:00 +0000
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Subject: Re: [Cfrg] SIV for non-AES ciphers first draft
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I think I will update the draft to use keyed Blake2s rather than HMAC-SHA-256, as it has several advantages in terms of speed and features. I will try and update the I-D this week. Does anybody have any other feedback? Is the subject matter of interest to CFRG? The draft link again: https://tools.ietf.org/html/draft-madden-generalised-siv-00 Kind regards, Neil > On 26 Nov 2018, at 09:41, Neil Madden <neil.e.madden@gmail.com> wrote: > > I’m not wedded to HMAC-SHA256, so Blake2 is an attractive option. I went with HMAC-SHA256 because it seems good enough and fairly ubiquitous. > > If we went for Blake2 then there are a number of decisions to be made: > > 1. Do we pick Blake2b or Blake2s? My mild preference would be for the s variant as both cipher and MAC then work well on 32-bit systems and it requires less RAM. > > 2. Do we go for 256-bit auth tag (as now), or take advantage of Blake2’s variable length output to produce a 192-bit tag, exactly matching the nonce required for XChaCha? A 256-bit auth tag is probably excessive for most uses. > > 3. Do we use Blake2’s native keyed hash support or use HMAC-Blake2? See [1] for some arguments in favour of using HMAC, but then keyed Blake2 is (presumably) faster. > > [1] http://noiseprotocol.org/noise.html#hash-functions-and-hashing > > — Neil > >> On 26 Nov 2018, at 08:07, Paul Lambert <plambert@usfca.edu> wrote: >> >> On the draft … >> Given the benefits of Blake2 and it’s similar construction to ChaCha, why not use Blake2 instead of HMAC-SHA-256? >> >> Paul >> >> >>> On Nov 22, 2018, at 9:22 AM, Neil Madden <neil.e.madden@gmail.com> wrote: >>> >>> I have now uploaded a (very rough) first draft describing how to extend the SIV mode of operation to non-AES ciphers and MACs, as previously discussed on this list. >>> >>> The I-D is available here: https://urldefense.proofpoint.com/v2/url?u=https-3A__datatracker.ietf.org_doc_draft-2Dmadden-2Dgeneralised-2Dsiv_&d=DwIGaQ&c=qgVugHHq3rzouXkEXdxBNQ&r=oIg4FfS8P761BlhMPJ2ys3IvSyH4XQ12Mbj_mXrCAJs&m=5WQpmA8deCCE8ehAcBhR-0SwNWDHfNA7dEo1IVxbNUM&s=Bs8DJzvOJ6KwhzN8Yti0sRCdOT5r02Ho7m3qmNKJpuI&e= >>> The source is on Github here: https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_NeilMadden_draft-2Dmadden-2Dgeneralised-2Dsiv&d=DwIGaQ&c=qgVugHHq3rzouXkEXdxBNQ&r=oIg4FfS8P761BlhMPJ2ys3IvSyH4XQ12Mbj_mXrCAJs&m=5WQpmA8deCCE8ehAcBhR-0SwNWDHfNA7dEo1IVxbNUM&s=qgsdZqOvSNNunN3u9v69TfSUfrP3mW7OV865Ui6qq8E&e= >>> >>> Feedback welcome. Hopefully I’ve managed to wrestle xml2rfc to produce the right output. >>> >>> Kind regards, >>> >>> Neil Madden >>> _______________________________________________ >>> Cfrg mailing list >>> Cfrg@irtf.org >>> https://urldefense.proofpoint.com/v2/url?u=https-3A__www.irtf.org_mailman_listinfo_cfrg&d=DwIGaQ&c=qgVugHHq3rzouXkEXdxBNQ&r=oIg4FfS8P761BlhMPJ2ys3IvSyH4XQ12Mbj_mXrCAJs&m=5WQpmA8deCCE8ehAcBhR-0SwNWDHfNA7dEo1IVxbNUM&s=g8oGz_kyMuTTp26sl6yblddFB_S1C5LiXRE9KKXhvxw&e= >> >
- [Cfrg] SIV for non-AES ciphers first draft Neil Madden
- Re: [Cfrg] SIV for non-AES ciphers first draft Paul Lambert
- Re: [Cfrg] SIV for non-AES ciphers first draft Neil Madden
- Re: [Cfrg] SIV for non-AES ciphers first draft Neil Madden
- Re: [Cfrg] SIV for non-AES ciphers first draft Salz, Rich
- Re: [Cfrg] SIV for non-AES ciphers first draft Paterson, Kenny
- Re: [Cfrg] SIV for non-AES ciphers first draft Tony Arcieri
- Re: [Cfrg] SIV for non-AES ciphers first draft Tony Arcieri
- Re: [Cfrg] SIV for non-AES ciphers first draft Neil Madden
- Re: [Cfrg] SIV for non-AES ciphers first draft Tony Arcieri
- Re: [Cfrg] SIV for non-AES ciphers first draft Paterson, Kenny
- Re: [Cfrg] SIV for non-AES ciphers first draft Blumenthal, Uri - 0553 - MITLL