Da Capo: JSON "clear text" signatures

Anders Rundgren anders.rundgren.net at gmail.com
Mon Jan 29 14:46:33 UTC 2018


On 2018-01-29 15:49, Sundararajan Athijegannathan wrote:
> Just to be clear. so.. do you want a toString (static method?) variant
> in java.lang.Double class as per this specification?

I don't think this is a major issue because all fundamental JSON types anyway needs be dealt with separately or through a super interface.
The existing Nashorn method (after upgrade to match ES better) moved to the Java layer would probably be just fine.

Anders

> 
> -Sundar
> 
> On 29/01/18, 7:45 PM, Anders Rundgren wrote:
>> On 2018-01-29 14:52, Hannes Wallnöfer wrote:
>>> Hi Anders,
>>>
>>> I think I lack the context required to understand what you’re asking
>>> for. Can you explain how transmitting numbers/doubles in JSON should
>>> work and how the static method you’re asking for would enable this?
>>
>> Sure.  Signatures depend on that data appears identical on both sides
>> (sender + receiver).
>> If one side outputs the integer 10 as 10.0 (which is OK JSON-wise),
>> the signature will break in an EcmaScript environment where it must be
>> 10 and nothing else.
>> JSON tools would call the proposed static method rather than building
>> their own number serializer.
>>
>> Initially I thought number serialization was a simple problem but that
>> was entirely wrong :-)
>> Fortunately the ECMA folks have the expertize needed and their
>> solution is already supported in billions of devices.
>> Nashorn almost cuts it but only for JavaScript, not Java.
>>
>>> Also, is there a document somewhere describing the IETF
>>> standardization work you’re talking about?
>>
>> You will have to wait to next week (when it becomes public), but in
>> the meantime you can take a look at the core "input specifications":
>> https://cyberphone.github.io/doc/security/jose-jcs.html
>> https://cyberphone.github.io/doc/security/jose-jef.html
>>
>> Thanx,
>> Anders
>>
>>>
>>> Thanks,
>>> Hannes
>>>
>>>> Am 28.01.2018 um 10:48 schrieb Anders Rundgren
>>>> <anders.rundgren.net at gmail.com>:
>>>>
>>>> The JSON "clear text" signature initiative seems to (finally) be
>>>> headed for IETF standardization.  The plan is having a BOF session
>>>> at the next IETF in London.
>>>>
>>>> This scheme builds on EcmaScript JSON processing rules for data
>>>> normalization which only rely on JSON.parse() and JSON.stringify().
>>>>
>>>> A thorny issue for implementers is though serializing the JSON
>>>> "Number" type.
>>>>
>>>> An with Node.js, Chrome, Firefox, Safari (unfortunately not entirely
>>>> compatible...) solution is currently available in "Nashorn":
>>>> http://hg.openjdk.java.net/jdk8/jdk8/nashorn/file/096dc407d310/src/jdk/nashorn/internal/objects/NativeNumber.java
>>>>
>>>>
>>>> It would be great if such support could for example be included as a
>>>> static method in java.lang.Double, making Java and
>>>> EcmaScript/JavaScript 100% interoperable with respect to this
>>>> feature, the rest is actually close to trivial.
>>>>
>>>> thanx,
>>>> Anders
>>>> https://github.com/OAI/OpenAPI-Specification/issues/1464#issue-291622705
>>>>
>>>
>>



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