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Re: Question regarding JSON-LD canonicalization

From: Charles E. Lehner <charles.lehner@spruceid.com>
Date: Mon, 19 Oct 2020 15:59:18 -0400
To: public-credentials@w3.org
Message-ID: <20201019155918.28406beb@spruceid.com>
Hi Andreas,

The RDFDataSet must be serialized as a N-Quads document (https://www.w3.org/TR/n-quads/).

jsonld-java appears to have a method for that, RDFDatasetUtils.toNQuads:
https://github.com/jsonld-java/jsonld-java/blob/master/core/src/main/java/com/github/jsonldjava/core/RDFDatasetUtils.java

Then you hash the results, as Orie referenced.

Regards,

Charles E. Lehner

Spruce Systems, Inc.

On Mon, 19 Oct 2020 14:33:06 -0500
Orie Steele <orie@transmute.industries> wrote:

> https://github.com/digitalbazaar/jsonld-signatures/blob/e3f7c1209f2adc0d3b9171083f98785d7a1d180d/lib/suites/LinkedDataSignature.js#L111
> 
> https://github.com/digitalbazaar/jsonld-signatures/blob/e3f7c1209f2adc0d3b9171083f98785d7a1d180d/lib/suites/LinkedDataSignature.js#L213
> 
> See also the spec:
> https://w3c-ccg.github.io/ld-proofs/#create-verify-hash-algorithm
> 
> Regards,
> 
> OS
> 
> On Mon, Oct 19, 2020 at 2:30 PM Andreas Kuehne <kuehne@trustable.de>
> wrote:
> 
> > Hi experts,
> >
> >
> >  I would like to canonicalize a JSON-LD as a preparation for a
> > signature creation.
> >
> > Using jsonld-java and applied normalize() using URDNA2015. But the
> > output is not a byte array (ready for hashing) but a RDFDataSet.
> > What's the next step to retrieve a hashable byte array?
> >
> >
> > Greetings,
> >
> >
> > Andreas
> >
> > --
> > Andreas Kühne
> >
> > Chair of OASIS DSS-X
> >
> > phone: +49 177 293 24 97
> > mailto: kuehne@trustable.de
> >
> >
> > Trustable solutions UG (haftungsbeschränkt), Gartenheimstr. 39C,
> > 30659 Hannover, Amtsgericht Hannover HRB 219338
> >
> > Trustable Ltd. Niederlassung Deutschland, Gartenheimstr. 39C, 30659
> > Hannover, Amtsgericht Hannover HRB 212612
> >
> > Company UK Company No: 5218868 Registered in England and Wales
> >
> >
> >
> >  
> 

Received on Monday, 19 October 2020 20:03:59 UTC

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