[Openid-specs-fapi] Signatures in FAPI and W3C's PaymentRequest

Anders Rundgren anders.rundgren.net at gmail.com
Thu Jan 3 13:55:10 UTC 2019

On 2019-01-03 13:32, Dave Tonge wrote:
> Hi Anders

Hi Dave,

> Do you have a link to the documentation for signing PaymentRequests?

This requirement has been discussed many times [1] but nothing have reached any specification.  With the new work-item "Secure Payments" W3C will have to deal with signatures.


1] https://github.com/w3c/payment-request/issues/714#issuecomment-390552775

> Thanks
> Dave
> On Fri, 21 Dec 2018 at 05:42, Anders Rundgren via Openid-specs-fapi <openid-specs-fapi at lists.openid.net <mailto:openid-specs-fapi at lists.openid.net>> wrote:
>     Hi FAPIers,
>     There are multiple issues here but let me focus on a subject which I have spent considerable time and effort on,  namely "Signed JSON".
>     Since PaymentRequest is a JavaScript API running in a browser, FAPI's current HTTP-bound signature scheme is not applicable.
>     That is, the W3C have to come up with another model for https://www.w3.org/securepay/charter.html which is a pity since it means that JSON signature solutions (possibly even within a single application), will be different.
>     Effectively W3C's at this stage only known choices are:
>     - JWS [1]
>     - JWS-JCS [2, 3]
>     - Starting from scratch
>     Personally, I would be very surprised if the W3C settles on JWS because it pretty much destroys the API concept.
>     WDYT?
>     Anders
>     1] https://tools.ietf.org/html/rfc7515
>     2] Underpinning Internet-Draft: https://tools.ietf.org/html/draft-rundgren-json-canonicalization-scheme-02
>     3] On-line testing: https://mobilepki.org/jws-jcs/home
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> Dave Tonge
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