FHIR Digital Signature Working Page

This page documents a series of proposals arising out of the digital signature implementation project

Proposal 1 : A page for digital signature implementation notes

We should add a digital signature page that:

• describes the use cases that we support
• details general implementation considerations & where to look for support
• describes a profile on xml digital signatures
• describes some FHIR specific transforms that when used with FHIR resources confer robustness against format changes, and meet the use cases
• deals with xml vs json

Proposal 2

We should add a note to both the xml and json pages describing signature ready xml and json. Implementers are recommended to conform to this

XML ready for Digital Signature

• default namespaces - only use default namespaces for fhir and xhtml namespaces
• outside the xhtml, no whitespace except in attributes
• no processing instructions, no xml comment

JSON ready for digital Signature

• all unimportant whitespace removed from the JSON representation

XML/JSON that conforms to this profile can be reproduced exactly from the data in the resource, without needing to store the actual XML (or can be recreated correctly from the JSON)

Proposal 3

That we define a standard transform