Re: [jose] canonical JSON
Tim Bray <tbray@textuality.com> Tue, 19 February 2013 20:50 UTC
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Date: Tue, 19 Feb 2013 12:50:13 -0800
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From: Tim Bray <tbray@textuality.com>
To: Mike Jones <Michael.Jones@microsoft.com>
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Cc: Richard Barnes <rlb@ipv.sx>, Daniel Holth <dholth@gmail.com>, "Manger, James H" <James.H.Manger@team.telstra.com>, jose <jose@ietf.org>, "Matt Miller (mamille2)" <mamille2@cisco.com>
Subject: Re: [jose] canonical JSON
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My instinct, as the author of a reasonably popular library that generates canonical XML, is that JSON ought to be quite a bit easier. But that’s only interesting if Mike is wrong and there aren’t better alternatives. -T On Tue, Feb 19, 2013 at 12:48 PM, Mike Jones <Michael.Jones@microsoft.com>wrote: > [Repeating this on the correct thread...] > > I'm strongly against canonicalization. The XML canonicalization > experience was horrible and resulted in more interop bugs than any other > aspect of XML DSIG, XML ENC, etc. Let's not repeat the mistakes of our > elders. ;-) > > I also haven't seen a clear use case that canonicalization solves that > can't be more easily solved another way. > > -- Mike > > -----Original Message----- > From: jose-bounces@ietf.org [mailto:jose-bounces@ietf.org] On Behalf Of > Matt Miller (mamille2) > Sent: Tuesday, February 19, 2013 12:35 PM > To: Richard Barnes > Cc: Daniel Holth; Manger, James H; jose > Subject: Re: [jose] canonical JSON > > I know I'm still reeling from canonicalization (c14n) issues in XML, but I > can put that aside. It would be nice to have JWK fingerprinting. > > I can see value in each JWK type defining what is canonical; I'm less > thrilled limiting metadata to a specific place, but could live with that. > I can see where excluding metadata can get us in trouble later, but I > think that would mean having a much more robust c14n approach. > > By the way, there is going to be a JSON BoF in Orlando, and c14n seems > like a good thing to bring up there. > > > - m&m > > Matt Miller < mamille2@cisco.com > > Cisco Systems, Inc. > > PS: 42 vs 4.2e0 vs 4.2e1 > > On Feb 19, 2013, at 7:59 AM, Richard Barnes <rlb@ipv.sx> wrote: > > > So your fingerprint algorithm would be something like the following? > > > > INPUT: JWK > > 1. Remove "metadata" fields. So, for RSA, you would be left with > > {"kty", "n", "e"} 2. Convert stripped JWK to canonical form 3. Compute > > digest over canonical form > > > > That seems generally agreeable to me. > > > > For (1) to be possible, you would need to define which fields are > > covered in the fingerprint for each key type ("kty" value). Or, > > alternatively, you could restructure JWK so that metadata fields are > grouped into a "meta" > > sub-dict. Which might be nice anyway. > > > > For (2), I agree that there is probably a better canonicalization than > > CJSON. The code I pasted earlier implements the following changes > > from RFC > > 4627: > > -- Object fields must be in lexicographic order, sorted by field name > > -- No white space allowed > > -- Numbers: Exponent part must use 'e' > > -- Numbers: Exponent part must not use '+' > > -- Numbers: Fraction part must not have trailing zeros > > -- Strings: All characters must be escaped ISTM that those changes are > > fairly minimal, and avoid some of the CJSON problems that have been > > discussed above. Reasonably people can disagree over the string > > aspect; if you want less expansion, you could do things like exempt > > printable ASCII. > > > > > > > > > > On Tue, Feb 19, 2013 at 8:56 AM, Daniel Holth <dholth@gmail.com> wrote: > > > >> On Tue, Feb 19, 2013 at 1:57 AM, Manger, James H < > >> James.H.Manger@team.telstra.com> wrote: > >> > >>> A canonical form of JSON might be fairly easy, but the one you quote > >>> ( > >>> http://wiki.laptop.org/go/Canonical_JSON) can't handle floating > >>> point numbers (or very large integers), and produces invalid JSON if > >>> a string includes a tab! Fix those (escaping control chars > >>> [\u0000-\u001f]; use normalized scientific notation for numbers) and > >>> it might be worth > >>> considering.**** > >>> > >>> ** ** > >>> > >>> Defining JOSE calculations in terms of 1 or more byte arrays, the > >>> first of which is a UTF-8-encoded JSON header, would be useful. It > >>> can then be packaged as dot-separated base64url-encoded segments to > >>> be HTTP-header-friendly, or packaged as a single JSON object to be > >>> programmer-friendly, or packaged as raw bytes to be efficient. > >>> > >> > >> I am only proposing a key fingerprinting specification that does not > >> employ DER encoding. JWKs do not contain tabs or floating point numbers. > >> > > _______________________________________________ > > jose mailing list > > jose@ietf.org > > https://www.ietf.org/mailman/listinfo/jose > > _______________________________________________ > jose mailing list > jose@ietf.org > https://www.ietf.org/mailman/listinfo/jose > _______________________________________________ > jose mailing list > jose@ietf.org > https://www.ietf.org/mailman/listinfo/jose >
- [jose] JWK-specific key fingerprints? Daniel Holth
- Re: [jose] JWK-specific key fingerprints? Stephen Farrell
- Re: [jose] JWK-specific key fingerprints? Martin Thomson
- Re: [jose] JWK-specific key fingerprints? Daniel Holth
- Re: [jose] JWK-specific key fingerprints? Richard Barnes
- Re: [jose] JWK-specific key fingerprints? Daniel Holth
- Re: [jose] canonical JSON Manger, James H
- Re: [jose] canonical JSON Daniel Holth
- Re: [jose] canonical JSON Richard Barnes
- Re: [jose] canonical JSON Matt Miller (mamille2)
- Re: [jose] canonical JSON Mike Jones
- Re: [jose] canonical JSON Tim Bray
- Re: [jose] canonical JSON David Waite
- Re: [jose] canonical JSON John Bradley
- Re: [jose] canonical JSON Mike Jones
- Re: [jose] canonical JSON Justin Richer
- Re: [jose] canonical JSON Mike Jones
- Re: [jose] canonical JSON Axel.Nennker
- Re: [jose] canonical JSON Richard Barnes
- Re: [jose] canonical JSON Richard Barnes
- Re: [jose] canonical JSON Daniel Holth