feat(did-key): Add EBSI Natural Person Format

Enhance did:key functionality to resolve [EBSI-style did:keys](https://hub.ebsi.eu/vc-framework/did/natural-person).

They use the JWK_JCS-PUB multicodec.

Relevant issues that are related to this PR:
[w3c-ccg/did-method-key#63](w3c-ccg/did-method-key#63)
[#536](#536)

Re-do of former PR #545

crates/jwk/src/lib.rs

@@ -102,6 +102,10 @@ impl FromStr for JWK {
     }
 }
 
+pub fn from_bytes(bytes: &[u8]) -> Result<JWK, serde_json::Error> {
+    serde_json::from_slice(bytes)
+}
+
 impl TryFrom<serde_json::Value> for JWK {
     type Error = serde_json::Error;
 
@@ -1314,6 +1318,7 @@ mod tests {
     const RSA_DER: &[u8] = include_bytes!("../../../tests/rsa2048-2020-08-25.der");
     const RSA_PK_DER: &[u8] = include_bytes!("../../../tests/rsa2048-2020-08-25-pk.der");
     const ED25519_JSON: &str = include_str!("../../../tests/ed25519-2020-10-18.json");
+    const JWK_JCS_JSON: &[u8] = include_bytes!("../../../tests/jwk_jcs-pub.json");
 
     #[test]
     fn jwk_to_from_der_rsa() {
@@ -1325,6 +1330,17 @@ mod tests {
         assert_eq!(key.to_public().params, Params::RSA(rsa_params));
     }
 
+    #[test]
+    fn jwk_from_bytes() {
+        let actual_jwk: JWK = from_bytes(JWK_JCS_JSON).unwrap();
+        let actual_params: Params = actual_jwk.params;
+        if let Params::EC(ref ec_params) = actual_params {
+            assert_eq!(ec_params.curve.as_deref(), Some("P-256"));
+        } else {
+            panic!("actual_params is not of type Params::EC");
+        }
+    }
+
     #[test]
     fn rsa_from_str() {
         let _key: JWK = serde_json::from_str(RSA_JSON).unwrap();
@@ -1369,7 +1385,7 @@ mod tests {
             "alg": "RS256",
             "kid": "2011-04-29"
         }))
-        .unwrap();
+            .unwrap();
         let thumbprint = key.thumbprint().unwrap();
         assert_eq!(thumbprint, "NzbLsXh8uDCcd-6MNwXF4W_7noWXFZAfHkxZsRGC9Xs");
 

crates/jwk/src/multicodec.rs

@@ -47,6 +47,9 @@ impl JWK {
             ssi_multicodec::BLS12_381_G2_PUB => {
                 crate::bls12381g2_parse(k).map_err(FromMulticodecError::Bls12381G2Pub)
             }
+            ssi_multicodec::JWK_JCS_PUB => {
+                crate::from_bytes(k).map_err(FromMulticodecError::JwkJcsPub)
+            }
             _ => Err(FromMulticodecError::UnsupportedCodec(codec)),
         }
     }
@@ -165,6 +168,9 @@ pub enum FromMulticodecError {
     #[error(transparent)]
     Bls12381G2Pub(ssi_bbs::Error),
 
+    #[error(transparent)]
+    JwkJcsPub(serde_json::Error),
+
     /// Unexpected multibase (multicodec) key prefix multicodec
     #[error("Unsupported multicodec key type 0x{0:x}")]
     UnsupportedCodec(u64),

tests/jwk_jcs-pub.json

@@ -0,0 +1,6 @@
+{
+  "crv": "P-256",
+  "kty": "EC",
+  "x": "g3fsv1xpWPH099LIUn_zJoOF5Ur8xobyzZwX9m_dJ4E",
+  "y": "9304UAFl55xQMfrnB-zKEjjXEC4OFWSuYnr7W6hdkVA"
+}