Support for Canonicalization (Sorting)

Using canonicalization, it becomes very simple adding a digital signature to a JSON object: https://github.com/cyberphone/json-canonicalization/tree/master/dotnet/json.net.sign

I have skimmed the code and it “seems” that the least intrusive change would be to add one field to Netwonsoft.Json.Formatting.

The suggested change would introduce the following algorithm: https://cyberphone.github.io/doc/security/draft-rundgren-json-canonicalization-scheme.html#json.sorting.properties

It would be sufficient calling this formatting mode Sorted since there are other things needed for full-blown I-JSON compatible signature support.

[radu-matei]

Hi, everyone! First of all, thanks for opening this issue, @cyberphone (and for the linked library).

I do believe adding a canonical formatter would be extremely helpful, specifically when trying to sign JSON files, and I agree that @cyberphone’s suggestion of adding a new formatter in the enum.

@JamesNK - is this something we want to add in a future release? However, if that is not the case, what would be the best way to pass a custom formatter when serializing? (not a contract resolver).

[drauch]

Thank you for the recommendation.