W3C home > Mailing lists > Public > public-credentials@w3.org > December 2014

Re: New JSON-LD digital signature library for Javascript (browsers and node.js)

From: Melvin Carvalho <melvincarvalho@gmail.com>
Date: Mon, 8 Dec 2014 16:14:52 +0100
Message-ID: <CAKaEYhJZN2MtaG9=6WmR1Qgmq+b5sx=N53nU+ubEXPduVuUHog@mail.gmail.com>
To: Dave Longley <dlongley@digitalbazaar.com>
Cc: W3C Credentials Community Group <public-credentials@w3.org>
On 8 December 2014 at 16:06, Dave Longley <dlongley@digitalbazaar.com>
wrote:

>  On 12/08/2014 04:40 AM, Melvin Carvalho wrote:
>
>
>
> On 8 December 2014 at 04:31, Manu Sporny <msporny@digitalbazaar.com>
> wrote:
>
>> Digital Bazaar has just released a convenience library for creating and
>> verifying JSON-LD Signatures in Javascript in the browser and in node.js:
>>
>> https://github.com/digitalbazaar/jsonld-signatures/
>>
>> The package is in npm (and bower):
>>
>> https://www.npmjs.org/package/jsonld-signatures
>>
>> The software is released under a BSD license (free for use in both open
>> source and proprietary systems).
>>
>> If you're interested in what the digital signature creation process
>> looks like, here it is:
>>
>>
>> https://github.com/digitalbazaar/jsonld-signatures/blob/master/lib/jsonld-signatures.js#L109
>>
>> and the digital signature verification process:
>>
>>
>> https://github.com/digitalbazaar/jsonld-signatures/blob/master/lib/jsonld-signatures.js#L207
>>
>
>  Awesome!
>
>  I'm right it only works with RSA keys right now, e.g. not with bitcoin
> ECC?
>
>  Slight nit pick:  perhaps the graph signature 2012 URL could be a
> default option?
>
>  Three things I'd love to see as convenience functions:
>
>  1. Normalize -- Done
>  2. Signing -- Done
>  3. Hash content into ID, so that blank nodes can easily be replaced with
> a URI (I'd suggest ni:///sha256;<base64urlhash>
>
>  (3) would facilitate (2) more easily, imho, as part of a common 3 step
> process
>
>  Thoughts / good idea / bad idea?
>
>
> What would the details of (3) be? What is the "content" that would be
> hashed?
>

What I usually do is hash the normalized form, which I think is possibly
the most logical thing to do?

So:

if @id
  return
else
  @id = sha256(normalized(json-ld))


>
> --
> Dave Longley
> CTO
> Digital Bazaar, Inc.http://digitalbazaar.com
>
>
Received on Monday, 8 December 2014 15:15:19 UTC

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