Merge pull request w3c#893 from w3c/issue-891-ref-fido-registry

Reference [[FIDO-Registry]] for raw EC public key format

Author: emlun

index.bs

@@ -143,6 +143,10 @@ spec: FIDO-U2F-Message-Formats; urlPrefix: https://fidoalliance.org/specs/fido-u
         text: Section 4.3; url: registration-response-message-success
         text: Section 5.4; url: authentication-response-message-success
 
+spec: FIDO-Registry; urlPrefix: https://fidoalliance.org/specs/fido-v2.0-ps-20170927/fido-registry-v2.0-ps-20170927.html
+    type: dfn
+        text: Section 3.6.2; url: public-key-representation-formats
+
 
 </pre> <!-- class=anchors -->
 
@@ -3568,8 +3572,8 @@ This attestation statement format is used with FIDO U2F authenticators using the
         key over the P-256 curve, terminate this algorithm and return an appropriate error. 
     1. Extract the claimed |rpIdHash| from |authenticatorData|, and the claimed |credentialId| and |credentialPublicKey| from
         |authenticatorData|.<code>[=attestedCredentialData=]</code>.
-    1. Convert the COSE_KEY formatted |credentialPublicKey| (see [=Section 7=] of [[!RFC8152]]) to CTAP1/U2F user public key
-        format (see [=Section 4.3=] of [[!FIDO-U2F-Message-Formats]]).
+    1. Convert the COSE_KEY formatted |credentialPublicKey| (see [=Section 7=] of [[!RFC8152]]) to Raw ANSI X9.62 public key
+        format (see ALG_KEY_ECC_X962_RAW in [=Section 3.6.2=] of [[!FIDO-Registry]]).
         - Let |x| be the value corresponding to the "-2" key (representing x coordinate) in |credentialPublicKey|, and confirm its
             size to be of 32 bytes.
             If size differs or "-2" key is not found, terminate this algorithm and return an appropriate error.
@@ -5020,6 +5024,14 @@ for their contributions as our W3C Team Contacts.
     "status": "FIDO Alliance Proposed Standard"
   },
 
+  "FIDO-Registry": {
+    "authors": ["R. Lindemann"],
+    "title": "FIDO Registry of Predefined Values",
+    "href": "https://fidoalliance.org/specs/fido-v2.0-ps-20170927/fido-registry-v2.0-ps-20170927.html",
+    "status": "FIDO Alliance Proposed Standard",
+    "date": "27 September 2017"
+  },
+
   "FIDO-APPID": {
     "authors": ["D. Balfanz", "B. Hill", "R. Lindemann", "D. Baghdasaryan"],
     "title": "FIDO AppID and Facets",