Re: [jose] At a glance: JWS vs "in-object" ES6/JSON signatures

This may be just my personal opinion, but preserving member creation order is only one small part of producing canonical JSON, which would be what would be required for such a scheme to be guaranteed to work.  For instance, if the value 1e3 is part of the JSON input, will JSON.stringify() be guaranteed to emit it as 1e3, or might it be 1E3 or 100?  Unless it's deterministic, different serializers will produce different results, and therefore different signatures.  Without a canonical JSON being both defined and widely deployed, I can't recommend doing any work that requires a canonical JSON representation to deterministically succeed.

				-- Mike

-----Original Message-----
From: jose [mailto:jose-bounces@ietf.org] On Behalf Of Anders Rundgren
Sent: Wednesday, October 28, 2015 11:40 PM
To: jose@ietf.org
Subject: [jose] At a glance: JWS vs "in-object" ES6/JSON signatures

ES6-compliant in-object JS/JSON signature:

   var inObjectSignedData =
     {
         // Object data expressed as JS properties
         "device": "Pump2",
         "value": 1e-18,

         // Object signature
         "signature": {
             ...Protected headers + Signature value expressed as JS properties...
         }
     };

JavaScript's JSON.parse() and JSON.stringify() suffice for "canonicalization" purposes.

Converting the above to JWS JSON Serialization you would get:

var signedData =
   {
       // Object data in a coded format
       "payload":"<payload contents>",

       // Protected headers wrapped in Base64URL
       "protected":"<integrity-protected header contents>",

       // Signature in a unique format
       "signature":"<signature contents>"
   }

ES6 was released in June 2015 so this opportunity is actually quite new.

Cheers,
Anders

http://webpki.org/ietf/draft-rundgren-predictable-serialization-for-json-tools-00.html#rfc.section.3.3

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