feat: remove references to signatures (International-Data-Spaces-Asso…

…ciation#181)

* Remove references to signatures

* Update PNG

negotiation/contract.negotiation.binding.https.md

@@ -162,11 +162,6 @@ Authorization: ...
   "@type": "dspace:ContractAgreementVerificationMessage",
   "dspace:providerPid": "urn:uuid:dcbf434c-eacf-4582-9a02-f8dd50120fd3",
   "dspace:consumerPid": "urn:uuid:32541fe6-c580-409e-85a8-8a9a32fbe833",
-  "dspace:consumerSignature": {
-    "timestamp": 121212,
-    "hash": "...",
-    "signature": ""
-  }
 }
 
 ```

negotiation/contract.negotiation.protocol.md

@@ -125,7 +125,7 @@ will be created on consumer side and the consumer selects an appropriate `consum
 
 #### Description
 
-The `ContractAgreementMessage` is sent by a provider when it agrees to a contract. It contains the complete contract agreement with the provider's signature.
+The `ContractAgreementMessage` is sent by a provider when it agrees to a contract. It contains the complete contract agreement.
 
 A `ContractAgreementMessage` must contain a `consumerPid` and a `providerPid`.
 
@@ -155,7 +155,7 @@ contract (i.e. the "connectors").
 
 #### Description
 
-The `ContractAgreementVerificationMessage` is sent by a consumer to verify the acceptance of a contract agreement. A provider responds with an error if the signature can't be
+The `ContractAgreementVerificationMessage` is sent by a consumer to verify the acceptance of a contract agreement. A provider responds with an error if the contract cannot be
 validated or is incorrect.
 
 A `ContractAgreementVerificationMessage` must contain a `consumerPid` and a `providerPid`.
@@ -178,8 +178,8 @@ A `ContractAgreementVerificationMessage` must contain a `consumerPid` and a `pro
 #### Description
 
 When the `ContractNegotiationEventMessage` is sent by a provider with an `eventType` property set to `FINALIZED`, a contract agreement has been finalized and the associated asset
-is accessible. The state machine is transitioned to the `FINALIZED` state. Other event types may be defined in the future. A consumer responds with an error if the signature
-can't be validated or is incorrect.
+is accessible. The state machine is transitioned to the `FINALIZED` state. Other event types may be defined in the future. A consumer responds with an error if the contract
+cannot be validated or is incorrect.
 
 It is an error for a consumer to send a `ContractNegotiationEventMessage` with an eventType `FINALIZED` to the provider.
 
@@ -255,19 +255,3 @@ The `ContractNegotiation` is an object returned by a consumer or provider indica
 
 The `ContractNegotiationError` is an object returned by a consumer or provider indicating an error has occurred. It does not cause a state transition.
 
-## Hash and Signature Calculations
-
-Hash and Signatures are calculated as defined in the [[JWS/CT]](#references) of ...
-
-## References
-
-- [[JCS] JSON Canonicalization Scheme](https://www.ietf.org/archive/id/draft-jordan-jws-ct-08.html)
-- [[JWS/CT] JWS Clear Text JSON Signature Option](https://www.ietf.org/archive/id/draft-jordan-jws-ct-08.html)
-- [[JWS] JSON Web Signature](https://www.rfc-editor.org/rfc/rfc7797.html)
-
-## JWS Clear Text JSON Signature Option
-
-- Adopt JWS/CT, an extension to the JSON Web Signature (JWS) standard.
-- Combines the detached mode of JWS with the JSON Canonicalization Scheme (JCS). Detached mode is when the payload section of the JWS is replaced
-  by an empty string: `XXXX.PAYLOAD.YYYY` becomes `XXXX..YYYY`. Detached mode is described in the JWS spec.
-- Maintains Signed JSON data in JSON format.

negotiation/message/contract-agreement-message.json

@@ -19,6 +19,5 @@
       }]
     }]
   },
-  "dspace:signature": {},
   "dspace:callbackAddress": "https://......"
 }

negotiation/message/contract-agreement-verification-message.json

@@ -6,6 +6,5 @@
   "dspace:hashedMessage": {
       "dspace:digest": "some-hash",
       "dspace:algorithm": "SHA-384"
-  },
-  "dspace:signature": {}
+  }
 }

negotiation/message/diagram/contract-agreement-message.puml

@@ -12,7 +12,6 @@ class "dspace:ContractAgreementMessage" {
     dspace:providerPid : String
     dspace:consumerPid : String
     dspace:agreement : odrl:Agreement
-    dspace:signature: Object
     dspace:callbackAddress : xsd:anyURI
 }
 

negotiation/message/schema/contract-agreement-message-schema.json

@@ -29,9 +29,6 @@
 				"dspace:agreement": {
 					"$ref": "https://w3id.org/dspace/schemas/v0.8/contract-schema.json#/definitions/Agreement"
 				},
-				"dspace:signature": {
-					"type": "object"
-				},
 				"dspace:callbackAddress": {
 					"type" : "string"
 				}

negotiation/message/shape/contract-agreement-message-shape.ttl

@@ -57,10 +57,6 @@ dspace_shapes:ContractAgreementMessageShape
 		sh:severity sh:Violation ;
 		sh:message "<https://raw.githubusercontent.com/International-Data-Spaces-Association/ids-specification/master/schemas/contract-agreement-message-shape.ttl> (ContractAgreementMessageShape): An dspace:agreement property must point to exactly one odrl:Agreement class."@en ;
 	] ;
-	sh:property [
-		a sh:PropertyShape ;
-		sh:path dspace:signature ;
-	] ;
 	sh:property [
 		a sh:PropertyShape ;
         sh:path dspace:callbackAddress ;
@@ -70,4 +66,4 @@ dspace_shapes:ContractAgreementMessageShape
 		sh:severity sh:Violation ;
 		sh:message "<https://raw.githubusercontent.com/International-Data-Spaces-Association/ids-specification/master/schemas/contract-agreement-message-shape.ttl> (ContractAgreementMessageShape): An dspace:callbackAddress property must point to exactly one xsd:string value."@en ;
 	]
-.
+.