This specification describes the RSA Signature Suite created in 2018 for the Linked Data Signatures specification.
This is an experimental specification and is undergoing regular revisions. It is not fit for production deployment.
This specification describes the RSA Signature Suite created in 2018 for the Linked Data Signatures [[LD-SIGNATURES]] specification. It uses the RDF Dataset CANONICALIZATION Algorithm [[RDF-DATASET-CANONICALIZATION]] to transform the input document into its canonical form. It uses SHA-256 [[RFC6234]] as the message digest algorithm and the RS256 algorithm defined in JSON Web Signatures [[RFC7515]] as the signature algorithm.
The following terms are used to describe concepts involved in the generation and verification of the Linked Data Signature 2018 signature suite.
The 2018 RSA signature suite MUST be used in conjunction with the signing and verification algorithms in the Linked Data Signatures [[LD-SIGNATURES]] specification. The suite consists of the following algorithms:
Parameter | Value | Specification |
---|---|---|
canonicalizationAlgorithm | https://w3id.org/security#GCA2015 | [[RDF-DATASET-CANONICALIZATION]] |
digestAlgorithm | https://www.ietf.org/assignments/jwa-parameters#SHA256 | [[RFC6234]] |
signatureAlgorithm | https://www.ietf.org/assignments/jwa-parameters#RS256 | [[RFC7515]] |
This signature suite uses a constrained profile of JSON Web Signatures which is specified in [[RFC7797]]. The signature algorithm used is the JSON Web Signature implementation of the RSASSA-PKCS1-v1_5 algorithm. The steps to construct and verify the digital signature are defined below.
The digital signature algorithm defined in Section 7.1: Signature Algorithm takes tbs, a privateKey, and options as inputs and produces a signatureValue as output.
{"alg":"RS256","b64":false,"crit":["b64"]}
and the
payload is a URL-safe Base64 encoding of tbs.
The digital signature algorithm defined in Section 7.2: Signature Verification Algorithm takes the value to be verified, tbv, the public key to the signature algorithm and returns a boolean value.
true
, otherwise return false
.
The following section describes security considerations that developers implementing this specification should be aware of in order to create secure software.
A simple example of an RSA 2018 signature:
{ "@context": ["http://schema.org/", "https://w3id.org/security/v1"], "description": "Hello world!", "proof": { "type": "RsaSignature2018", "created": "2017-10-24T05:33:31Z", "creator": "https://example.com/jdoe/keys/1", "domain": "example.com", "signatureValue": "eyiOiJJ0eXAK...EjXkgFWFO" } }